Distributed power supply control system, distributed power supply control device, central calculation device, distributed power supply control method, system stabilization control method, and control parameter setting method

A distributed power supply control system comprising:

• central calculation circuitry to set a control parameter of power control that is performed by a plurality of distributed power supply control circuits each connected to a corresponding one of different distributed power supplies, the power control being performed on power supplied from the distributed power supply;
• and
• the plurality of the distributed power supply control circuits each to measure a system state that is a state of power at a point of a transmission and distribution system connected thereto, calculate an emergency control amount according to a type of a system disturbance by using measurement information on the system state and the control parameter when the system disturbance occurs in the transmission and distribution system, and perform the power control, wherein
• the distributed power supply control circuit
• measures, as the system state, a system voltage, a system frequency, and a frequency change rate of the system frequency at a point of the transmission and distribution system connected thereto,
• determines presence or absence of occurrence of the system disturbance in the transmission and distribution system and a type of the system disturbance when the system disturbance occurs in the transmission and distribution system, by using:
• the system voltage of measurement information on the system state;
• the system frequency and/or the frequency change rate of the system frequency of the measurement information;
• and the control parameter, and
• determines whether emergency control in the event of the system fault has a possibility of adversely affecting the system voltage and the system frequency, by using the system voltage and the system frequency of the measurement information on the system state and the control parameter.

A system stabilization control method for a plurality of distributed power supply control circuits in a distributed power supply control system including the distributed power supply control circuits and central calculation circuitry to control operations of the plurality of distributed power supply control circuits, the system stabilization control method comprising:

• measuring a system state that is a state of power at a point of a transmission and distribution system to which the distributed power supply control circuit is connected;
• transmitting, to the central calculation circuitry, distributed power supply information including an operation state of a distributed power supply and measurement information indicating the system state measured, and receiving, from the central calculation circuitry, a control parameter of power control set by the central calculation circuitry;
• using the measurement information and the control parameter to determine presence or absence of occurrence of a system disturbance in the power transmission and distribution system and a type of the system disturbance when the system disturbance occurs in the power transmission and distribution system, and calculate an emergency control amount according to the type of the system disturbance when the system disturbance occurs, the emergency control amount being a control amount for a power converter to perform the power control;
• and
• performing the power control to convert power supplied from the distributed power supply into a form of power handled by the transmission and distribution system using the emergency control amount, wherein
• measuring the system state includes measuring a system voltage, a system frequency, and a frequency change rate of the system frequency at a point of the transmission and distribution system connected thereto,
• using the measurement information and the control parameter includes
• determining presence or absence of occurrence of the system disturbance in the transmission and distribution system and a type of the system disturbance when the system disturbance occurs in the transmission and distribution system, by using:
• the system voltage of measurement information on the system state;
• the system frequency and/or the frequency change rate of the system frequency of the measurement information;
• and the control parameter, and
• determining whether emergency control in the event of the system fault has a possibility of adversely affecting the system voltage and the system frequency, by using the system voltage and the system frequency of the measurement information on the system state and the control parameter.

A distributed power supply control system comprising:

• central calculation circuitry to set a control parameter of power control that is performed by a plurality of distributed power supply control circuits each connected to a corresponding one of different distributed power supplies, the power control being performed on power supplied from the distributed power supply;
• and
• the plurality of the distributed power supply control circuits each to measure a system state that is a state of power at a point of a transmission and distribution system connected thereto, calculate an emergency control amount according to a type of a system disturbance by using measurement information on the system state and the control parameter when the system disturbance occurs in the transmission and distribution system, and perform the power control, wherein
• the distributed power supply control circuit includes a power converter for performing the power control, operates the power converter in a voltage control type when the system disturbance does not occur in the transmission and distribution system, and operates the power converter in a current control type when the system disturbance occurs in the transmission and distribution system.