Control system method of protectively controlling electric power system and storage medium storing program code

An electric power system protective control system for controlling an electric power system according to a state quantity related to the electric power system and inputted therefrom, said protective control system comprising:

• a communication network;
• an input device connected to the communication network so that data communication is permitted, said input device having:
• means for acquiring a precise time,
• inputting means for inputting the state quantity related to the electric power system therefrom,
• converting means for sampling the inputted state quantity according to the acquired precise time so as to convert the state quantity into digital data and
• first transmitting means for adding the precise time at each sampling timing to the digital data so as to transmit the digital data each having the precise time to the communication network;
• an opening/closing device connected to the communication network so that data communication is permitted and adapted to opening and closing a part of the electric power system,
• said opening/closing device having:
• means for receiving, through the communication network, a control command with respect to the opening/closing device and
• second transmitting means for transmitting an operating state of the opening/closing device to the communication network;
• and
• a protective control apparatus connected to the communication network so that data communication is permitted, said control apparatus having:
• means for performing a protective control operation process according to the digital data transmitted through the communication network and the operating state of the opening/closing device transmitted therethrough and
• third transmitting means for transmitting the control command through the communication network to the opening/closing device in response to a result of the protective control operation process of the performing means, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

An electric power system protective control system for performing an operation process in accordance with a state quantity inputted from an electric power system so as to protectively control the electric power system, said protective control system comprising:

• a communication network;
• a digital protective control apparatus connected to the communication network so that data communication is permitted, said digital protective control apparatus comprising:
• means for acquiring a precise time, converting means for sampling the state quantity inputted from the electric power system according to the acquired precise time so as to convert the state quantity into digital data and
• transmitting means for adding the precise time to the converted digital data at each sampling timing so as to transmit the digital data each having the precise time to the communication network;
• means for receiving the digital data transmitted through the communication network, each of said digital data having the precise time and
• means for time-sequentially arranging the received digital data each having the precise time in accordance with the precise time of each of the received digital data, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

An electric power system protective control system comprising:

• a plurality of digital protective control apparatuses for protectively controlling an electric power system;
• a communication network for connecting the digital protective control apparatuses to each other so that data communication is permitted, each of said digital protective control apparatuses having:
• means for acquiring a precise time,
• converting means for sampling a state quantity related to a first equipment device of the electric power system at predetermined periods in accordance with the precise time acquired by the acquiring means so as to convert the sampled state quantities into digital data, said first equipment device being an object for protectively control of the corresponding digital protective control apparatus,
• first judgement means for judging whether or not the first equipment device is faulty based on the converted digital data so as to perform a protective control operation process according to a result of the judgement of the first judgement means,
• second judgement means for judging whether or not the first equipment device and a second equipment device of the electric power system are faulty based on the converted digital data, said second equipment device being not object for protective control of the corresponding digital protective control apparatus;
• recording means for, when the judgement of the second judgement means is made that at least one of the first and second equipment devices is fault, adding the precise time to the converted digital data at each sampling timing so as to record the digital data each having the sampled precise time, and
• means for transmitting the digital data recorded by the record means to the communication network, said transmitted digital data having the sampled precise time;
• receiving means connected to the communication network for receiving the digital data transmitted through the communication network from each of the digital protective control apparatuses, each of said received digital data having the precise time;
• and
• arranging means for time-sequentially arranging the received digital data according to the sampled precise time thereof for each of the digital protective control apparatuses, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

An electric power system protective control system comprising:

• a plurality of digital protective control apparatuses for protectively controlling an electric power system;
• and
• a communication network for connecting the digital protective control apparatuses to each other so that data communication is permitted, each of said digital protective control apparatuses having:
• means for acquiring a precise time;
• converting means for sampling a state quantity related to an equipment device of the electric power system at predetermined periods in accordance with the precise time acquired by the acquiring means so as to convert the sampled state quantities into first digital data, said equipment device being an object for protective control of the corresponding digital protective control apparatus;
• transmitting means for adding the precise time at each sampling timing to each first converted digital data so as to transmit the first digital data each having the precise time to the communication network;
• means for receiving second digital data having the precise time transmitted from the transmitting means of at least one of other digital protective control apparatuses through the communication network;
• arranging means for time-sequentially arranging the received second digital data in accordance with the precise time of each second received digital data;
• and
• means for performing a protective control operation process by using one of the first digital data converted by the converting means and the second digital data time-sequentially arranged by the arranging means, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A control system comprising:

• a plurality of control apparatuses adapted to perform an operation process according to a state quantity related to a plant so as to control the plant, said control apparatuses being dispersively arranged;
• and
• a communication network by which the control apparatuses are connected to each other so that data communication is permitted, each of said control apparatuses comprising:
• means for acquiring signals at substantially constant periods;
• means for sequentially sampling a state quantity related to the plant at a same timing as a timing of other control apparatuses in accordance with the periodic signals acquired by the acquiring means so as to collect digital data;
• and
• means for adding time at each sampling timing based on the periodic signals to the collected digital data so as to sequentially store the digital data each having the time, wherein
• said periodic signals have an accuracy of substantially 1 μs to 100 ns.

An electric power system protective control system comprising:

• a plurality of protective control apparatuses adapted to perform a protective control operation process according to a state quantity related to an electric control system for protectively controlling the electric power system, respectively, said control apparatuses being distributed;
• and
• a communication network by which the protective control apparatuses are connected to each other so that data communication is permitted, each of said protective control apparatuses comprising:
• means for acquiring signals at substantially constant periods;
• collecting means for sequentially sampling the state quantity related to the electric power system at a same timing as a timing of another protective control apparatus in accordance with the periodic signals acquired by the acquiring means so as to collect digital data;
• and
• storage means for adding time at each sampling timing based on the periodic signals to the collected digital data so as to sequentially store the digital data each having the time, wherein
• said periodic signals have an accuracy of substantially 1 μs to 100 ns.

A computer-readable storage medium storing a program code for use in a protectively control of a plant, in which the plant has an input device for inputting a state quantity related to the plant therefrom and an opening/closing device for opening and closing a part of the plant, said program code comprising:

• a first step of causing a computer to acquire a precise time;
• a second step of causing said computer to sample the state quantity inputted from the input device according to the acquired precise time so as to convert the state quantity into digital data;
• a third step of causing said computer to add the precise time at each sampling timing to the digital data so as to transmit the digital data to a communication network, said digital data each having the sampled precise time;
• a fourth step of causing said computer to perform a control operation according to the digital data transmitted through the communication network;
• a fifth step of causing said computer to transmit a control command with respect to the opening/closing device through the communication network in response to a result of the control operation of the fourth step;
• a sixth step of causing said computer to receive, through the communication network, the control command with respect to the opening/closing device;
• and
• a seventh step of causing said computer to control an operation of the opening/closing device according to the received control command, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A computer-readable storage medium storing a program code for use in a control of a plant, in which the plant has an input device for inputting a state quantity related to the plant therefrom and an opening/closing device for opening and closing a part of the plant, and the program code is used for generating digital data having a precise time according to the state quantity, performing a control operation according to the digital data and controlling an operation of the opening/closing device in accordance with a result of the performed control operation, said program code comprising:

• a step of causing a computer to acquire the precise time;
• a step of causing said computer to sample the state quantity inputted from the input device according to the acquired precise time so as to convert the state quantity into digital data;
• and
• a step of causing said computer to add the precise time at each sampling timing to the digital data so as to transmit the digital data to a communication network, said digital data each having the sampled precise time, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A computer-readable storage medium storing a program code for use in a control of a plant, in which the plant has an input device for inputting a state quantity related to the plant therefrom and an opening/closing device for opening and closing a part of the plant, and the program code is used for generating digital data having a precise time according to the state quantity, performing a control operation according to the digital data and controlling an operation of the opening/closing device in accordance with a result of the performed control operation, said program code comprising:

• a step of causing a computer to perform a control operation according to the digital data transmitted through a communication network;
• and
• a step of causing said computer to transmit a control command through the communication network in response to a result of the control operation of the performing step, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A computer-readable storage medium storing a program code for use in a control of a plant, in which the plant has an input device for inputting a state quantity related to the plant therefrom and an opening/closing device for opening and closing a part of the plant, and the program code is used for generating digital data having a precise time according to the state quantity, performing a control operation according to the digital data and controlling an operation of the opening/closing device in accordance with a result of the performed control operation, said program code comprising:

• a step of causing a computer to receive, through a communication network, a control command with respect to the opening/closing device;
• and
• a step of causing said computer to control an operation of the opening/closing device according to the received control command, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A computer-readable storage medium storing a program code for use in a protectively control of an electric power system, in which the electric power system has an input device for inputting a state quantity related to the electric power system therefrom and an opening/closing device for opening and closing a part of the electric power system, said program code comprising:

• a step of causing a computer to acquire a precise time;
• a step of causing said computer to sample the state quantity inputted from the electric power system according to the acquired precise time so as to convert the state quantity into digital data;
• a step of causing said computer to add the precise time at each sampling timing to the digital data so as to transmit the digital data to a communication network, said digital data each having the sampled precise time;
• a step of causing said computer to receive the digital data transmitted through the communication network, said digital data each having the sampled precise time;
• and
• a step of causing said computer to time-sequentially arrange the received digital data each having the sampled precise time in accordance with the precise time of each of the received digital data, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A computer-readable storage medium storing a program code for use in a protective control of an electric power system by a plurality of computers including protective control computers, in which the plurality of computers are connected to each other through a communication network so that data communication is permitted, and the protective control computers are disposed in correspondence with equipment devices of the electric power system, respectively, said program code comprising:

• a step of causing each of the protective control computers to acquire a precise time;
• a step of causing each of the protective control computers to sample a state quantity related to an equipment device of the electric power system according to the acquired precise time so as to convert the state quantity into digital data, said equipment device being an object of protective control of each of the protective control computers;
• a first judgement step of causing each of the protective control computers to judge whether or not the objective equipment device is faulty based on the converted digital data so as to perform a protective control operation according to a result of the judgement of the first judgement step;
• a second judgement step of causing each of the protective control computers to judge whether or not the objective equipment device and other at least one of the equipment devices are faulty based on the converted digital data, said other at least one of the equipment devices being not an object of each of the protective control computers;
• a step of causing each of the protective control computers to, when the judgement of the second judgement means is made that at least one of the objective equipment device and other one of the equipment devices is fault, add the precise time to the converted digital data at each sampling timing so as to record the digital data each having the sampled precise time;
• a step of causing each of the protective control computers to transmit the digital data recorded by the record step to the communication network, said transmitted digital data having the sampled precise time;
• a step of causing at least one of the computers to receive the digital data transmitted through the communication network from each of the protective control computers, said received digital data having the sampled precise time;
• and
• a step of causing at least one of the computers to time-sequentially arrange the received digital data according to the sampled precise time thereof each of the protective control computers, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A computer-readable storage medium storing a plurality of program codes for use in a protective control of an electric power system, in which said plurality of program codes correspond to a plurality of computers, respectively, the plurality of computers are connected to each other through a communication network so that data communication is permitted, and the electric power system has a plurality of equipment devices which are objects of protective control of the protective control computers, respectively, said each of the program codes comprising:

• a step of causing a corresponding computer to acquire a precise time;
• a step of causing said corresponding computer to sample a state quantity related to the corresponding equipment device at predetermined periods in accordance with the acquired precise time so as to convert the sampled state quantity into first digital data;
• a transmitting step of causing said corresponding computer to add the precise time to each first converted digital data at each sampling timing so as to transmit the first digital data each having the sampled precise time to the communication network;
• a step of causing said corresponding computer to receive second digital data having the sampled precise time transmitted from another at least one of the computers through the communication network;
• a step of causing said corresponding computer to time-sequentially arrange the received second digital data in accordance with the sampled precise time of each second received digital data;
• and
• a step of causing said corresponding computer to perform a protective control operation by using one of the first digital data converted by the converting step and the second digital data time-sequentially arranged by the arranging step, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A computer-readable storage medium storing a plurality of program codes for protective controlling an electric power system by a protective control system according to a state quantity inputted from the electric power system, in which the protective control system has a plurality of computers and a circuit for acquiring a precise time, the plurality of program codes correspond to the plurality of computers, respectively, and the plurality of computers are connected to each other through a communication network so that data communication is permitted, said each of the program codes comprising:

• a step of causing a corresponding computer to sequentially sample the state quantity inputted from the electric power system at a same timing as a timing of other computers in accordance with the precise time so as to collect digital data;
• and
• a step of causing said corresponding computer to add the precise time at each sampling timing to the collected digital data so as to sequentially store the digital data each having the sampled precise time, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A method of protectively controlling a plant, in which the plant has an input device for inputting a state quantity related to the plant therefrom and an opening/closing device for opening and closing a part of the plant, said method comprising the steps of:

• acquiring a precise time;
• sampling the state quantity inputted from the input device according to the acquired precise time so as to convert the state quantity into digital data;
• adding the precise time at each sampling timing to the digital data so as to transmit the digital data to a communication network, said digital data each having the sampled precise time;
• performing a control operation according to the digital data transmitted through the communication network;
• transmitting a control command with respect to the opening/closing device through the communication network in response to a result of the control operation of the performing step;
• receiving, through the communication network, the control command with respect to the opening/closing device;
• and
• controlling an operation of the opening/closing device according to the received control command, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A method of protectively controlling an electric power system having a plurality of equipment devices, the method comprising the steps of:

• acquiring a precise time;
• sampling state quantities inputted from the respective equipment devices at a same timing in accordance with the precise time so as to collect digital data;
• and
• adding the precise time at each sampling timing to the collected digital data of the respective equipment devices so as to sequentially store the digital data each having the sampled precise time, wherein
• said precise time has an accuracy of substantially 1 μs to 100 ns.

A control system which receives and processes an analog state quantity of a plant, said control system comprising:

• a plurality of state quantity input/output units, which do not comprise a control operation function, each state quantity input/output unit of said plurality of state quantity input/output units comprising:
• precise time acquiring means for acquiring a precise time by GPS,
• converting means for converting the state quantity of the plant which must be controlled into digital data by sampling the state quantity in accordance with the acquired precise time, and
• transmitting means for adding said precise time by GPS of sampling to obtained digital data to generate digital data having the precise time so as to transmit data having the precise time to a communication network;
• an opening/closing device comprising:
• control-command receiving means for receiving, through said communication network, a control command for opening/closing the connections among units provided for the plant which must be controlled, and
• operation-state communicating means for communicating a state of operation of said opening/closing device to said communication network;
• and
• a protective operation unit comprising:
• calculating means for performing operations for carrying out control in accordance with digital data having the precise time and the state of the operation of said opening/closing device, and
• a control-command issuing means for issuing, through said communication network, a control command to said opening/closing device in accordance with results of control operations performed by said calculating means,
• wherein a hardware configuration and a software configuration are commonly provided for said respective state quantity input/output units.

An electric power system protective control system which receives a state quantity of an electric power system to protectively control the electric power system, said electric power system protective control system comprising:

• a plurality of state quantity input/output units, which do not comprise a protective control operation function, each state quantity input/output unit of said plurality of state quantity input/output units comprising:
• precise time acquiring means for acquiring a precise time by GPS,
• converting means for converting the analog state quantity of the electric power system into digital data by sampling the state quantity in accordance with the acquired precise time, and
• transmitting means for adding a precise time of sampling to obtained digital data to generate digital data having the precise time so as to transmit digital data having the precise time to a communication network;
• an opening/closing device comprising:
• control-command receiving means for receiving, through said communication network, a command for controlling opening/closing of the connections among systems provided for the electric power system, and
• operation-state communicating means for communicating a state of operation of said opening/closing device to said communication network;
• and
• a protective operation unit comprising:
• protective operation means for performing protective control operations in accordance with digital data having the precise time and the state of the operation of said opening/closing device, and
• control-command issuing means for issuing, through said communication network, a control command to said opening/closing device in accordance with results of protective control operations performed by said protective operation means,
• wherein a hardware configuration and a software configuration are commonly provided for said respective state quantity input/output units.

An electric power system protective control system for performing operations in accordance with a state quantity input from an electric power system to protectively control said electric power system, said electric power system protective control system comprising:

• a plurality of digital protective control apparatuses, which are provided in correspondence to units of an electric power system, each digital protective control apparatus of said plurality of digital protective control apparatuses comprising:
• precise time acquiring means for acquiring a precise time by GPS,
• converting means for sampling an analog state quantity of said electric power system at predetermined periods in accordance with the precise time acquired by said precise time acquiring means to convert the sampled analog state quantity into digital data, and
• digital-data transmitting means for adding precise time by GPS of sampling to digital data converted by said converting means to transmit digital data having the precise time to a communication network;
• receiving means for receiving digital data having the precise time and sequentially transmitted through said communication network;
• arranging means for time-sequentially arranging received digital data having the precise time in accordance with the added precise time;
• and
• an electric-site-side system simulation apparatus comprising generating means for generating a quantity of a test state of analog data for a digital protective control apparatus which must be tested in accordance with the digital data time-sequentially arranged by said arranging means.

An electric power system protective control system comprising:

• a plurality of digital protective control apparatuses configured to protect an electric power system;
• a communication network configured to connect the plurality of digital protective control apparatuses to one another such that data communication is permitted, wherein
• each of said plurality of digital protective control apparatuses comprises:
• precise time acquiring means for acquiring a precise time,
• converting means for, at predetermined periods, sampling a state quantity of a unit which must be protected in accordance with the precise time acquired by said precise time acquiring means and converting the sampled state quantity into digital data,
• protective control calculating means for determining whether or not an equipment device which must be protected is faulty in accordance with digital data converted by said converting means to perform protective control operation processes in accordance with a result of a determination,
• determining means for performing a determination individually from a faulty determining function of said protective control calculating means whether or not the equipment device which must be protected and an equipment device which is not protected are faulty in accordance with digital data converted by said converting means,
• recording means for adding a precise time of sampling to record digital data having the precise time when a determination is made in accordance with a result of the determination made by said determining means from at least one of the equipment device which must be protected and the equipment device which is not protected, and
• digital-data transmitting means for transmitting digital data having the precise time and recorded by said recording means to said communication network;
• receiving means connected to said communication network and arranged to receive a plurality of digital data each having the precise time transmitted from each of said digital protective control apparatuses through said communication network;
• and
• arranging means for time-sequentially arranging the plurality of received digital data each having the precise time for each of said digital protective control apparatuses in accordance with the added precise time.

An electric power system protective control system comprising:

• a plurality of digital protective control apparatuses for protecting an electric power system;
• and
• a communication network for connecting the plurality of digital protective control apparatuses to one another such that data communication is permitted, wherein
• each of said plurality of digital protective control apparatuses comprises:
• precise time acquiring means for acquiring a precise time,
• converting means for, at predetermined periods, sampling a state quantity of a unit which must be protected in accordance with the precise time acquired by said precise time acquiring means and converting the sampled state quantity into digital data,
• digital-data transmitting means for adding a precise time of sampling to digital data converted by said converting means to transmit digital data having the precise time to said communication network,
• receiving means for receiving digital data having the precise time sequentially transmitted from digital-data transmitting means of another digital protective control apparatus through said communication network,
• arranging means for time-sequentially arranging a plurality of digital data each having the precise time and received by said receiving means in accordance with the added precise time, and
• protective control calculating means for performing protective control operation processes in accordance with one of digital data converted by said converting means and digital data time-sequentially arranged by said arranging means.

An electric power system protective control system comprising:

• a plurality of protective control apparatuses configured to perform operations in accordance with an analog state quantity relating to a unit which must be protected and supplied from an electric power system to protectively control said electric power system;
• and
• a communication network through which said plurality of protective control apparatuses are connected to each other such that data communication is permitted, wherein
• each of said plurality of protective control apparatuses comprises:
• periodic-signal acquiring means for, which is also precise time acquiring means for acquiring a precise time by GPS, acquiring signals at substantially constant periods,
• digital-data collecting means for sequentially sampling an analog state quantity relating to said electric power system at the same timing as that of another protective control apparatus in accordance with the periodic signals acquired by said periodic-signal acquiring means to collect digital data, and
• storage means for adding precise time by GPS of sampling which is performed in response to the periodic signals to digital data collected by said digital-data collecting means to sequentially store digital data having the precise time.

A storage medium comprising:

• a control program stored therein to control a plant incorporating a plurality of units including a state quantity input/output unit and an opening/closing device, with a plurality of computers including at least a first computer provided for said state quantity input/output unit and a second computer provided for said opening/closing device, wherein
• said control program comprises:
• causing a precise time to be acquired by said first computer,
• causing said first computer to sample a state quantity of said state quantity input/output unit at predetermined periods in accordance with the precise time to convert the sample state quantity into digital data,
• causing said first computer to add precise time of sampling to digital data having the precise time to transmit digital data having the precise time to a communication network,
• causing said second computer to communicate a state of the operation of the opening/closing device to said communication network,
• causing at least one of the plurality of computers to receive digital data having the precise time and transmitted through said communication network and the state of the operation so as to perform operations in accordance with received digital data having the precise time and the state of the operation,
• causing said at least one computer to transmit an operation control command to said opening/closing device to said communication network in accordance with a result of the operations,
• causing said second computer to receive the operation control command transmitted through said communication network, and
• causing said second computer to operate said opening/closing device in accordance with the received operation control command.

A storage medium comprising a protective control program stored therein to protect a plurality of units provided for an electric power system by using a plurality of protective control computers, said protective control program comprising:

• causing each of said plurality of protective control computers to acquire a precise time;
• causing each of said plurality of protective control computers to sample a state quantity of an equipment device which must be protected at predetermined periods in accordance with the precise time to convert the sampled state quantity into digital data;
• causing each of said plurality of protective control computers to add the precise time of the sampling to converted digital data to transmit digital data having the precise time to a communication network;
• causing each of said plurality of protective control computers to receive digital data having said precise time transmitted from other digital protective control apparatus;
• causing each of said plurality of protective control computers to receive digital data having the precise time and sequentially transmitted from said other digital protective control apparatus through said communication network;
• causing each of said plurality of protective control computers to time-sequentially arrange the plurality of the received digital data each having the precise time in accordance with the added precise time;
• and
• causing each of said plurality of protective control computers to execute protective control operation processes in accordance with either converted data or digital data which has time-sequentially been arranged.