Intelligent electronic device, voltage control system, and voltage control method

A voltage control system comprising:

• an intelligent electronic device that is installed in a power distribution system;
• and
• a voltage management system configured to transmit information indicating a control target range to the intelligent electronic device,
• wherein the intelligent electronic device includes
• a control target acquisition unit that acquires information indicating the control target range from the voltage management system;
• a voltage detection unit that detects a voltage of the power distribution system at an installation location of the intelligent electronic device;
• a controllable quantity acquisition unit that acquires information indicating a controllable quantity from a distributed energy source connected to the power distribution system;
• a control quantity calculation unit that calculates a control quantity for the distributed energy source so that the control quantity falls within a range of the controllable quantity when the voltage detected by the voltage detection unit is determined to deviate from the control target range;
• and
• a control quantity transmission unit that transmits the control quantity calculated by the control quantity calculation unit to the distributed energy source,
• wherein the control quantity includes an active power and a reactive power of the distributed energy resource,
• between the active power and the reactive power, the reactive power takes precedence,
• the information indicating the control target range includes information indicating a control target range for each first period determined in advance, the first period being a setting period for a setting value of an automatic voltage regulator installed in the power distribution system, and
• a detection of the voltage by the voltage detection unit, a calculation of the control quantity by the control quantity calculation unit, and a transmission of the control quantity by the control quantity transmission unit are performed every second period that is determined in advance and is shorter than the first period.

A voltage control method of an intelligent electronic device installed in a power distribution system, comprising:

• acquiring information indicating a control target range from a voltage management system;
• detecting a voltage of the power distribution system at an installation location of the intelligent electronic device;
• acquiring information indicating a controllable quantity from a distributed energy source connected to the power distribution system;
• calculating a control quantity for the distributed energy source so that the control quantity falls within a range of the controllable quantity when the voltage detected in the second step is determined to deviate from the control target range;
• and
• transmitting the control quantity calculated in the fourth step to the distributed energy source,
• wherein the control quantity includes an active power and a reactive power of the distributed energy source,
• between the active power and the reactive power, the reactive power takes precedence,
• the information indicating the control target range includes information indicating a control target range for each first period determined in advance, the first period being a setting period for a setting value of an automatic voltage regulator installed in the power distribution system, and
• the detecting, the calculating, and the transmitting are performed every second period that is determined in advance and is shorter than the first period.