Voltage control device and voltage measurement device

A voltage control device that controls a voltage control apparatus such that a voltage is maintained within a range of a proper voltage upper limit value and a proper voltage lower limit value in a power-distribution-system voltage control system including a plurality of the voltage control apparatuses that are connected to a power distribution line of a high-voltage system and control a voltage of the power distribution line,

• the voltage control device comprising:
• a fluctuation calculator to calculate, using a voltage and active power measured by the voltage control apparatus, voltage tolerance, which is a difference between the voltage measured by the voltage control apparatus and a proper voltage upper limit value or a proper voltage lower limit value, and voltage sensitivity, which is a ratio of a fluctuation amount of the active power and a fluctuation amount of the voltage;
• an upper/lower-limit-change-request-information generator to generate upper/lower limit change request information for requesting a change of an upper limit value or a lower limit value of a control target range of another voltage control device;
• an upper/lower-limit-change processor to perform a change of an upper limit value or a lower limit value of a control target range of the voltage control device according to content of the upper/lower limit change request information when the upper/lower limit change request information is received from an outside of the voltage control device;
• and
• a communication processor to receive the upper/lower limit change request information from the outside of the voltage control device, and transmit the upper/lower limit change request information to a voltage control device other than the voltage control device, wherein
• the upper/lower limit change request information includes information indicating the voltage tolerance and the voltage sensitivity.