VOLTAGE MONITORING CONTROL SYSTEM, VOLTAGE MONITORING CONTROL DEVICE, MEASUREMENT DEVICE, AND VOLTAGE MONITORING CONTROL METHOD

摘要

A voltage monitoring control system includes voltage control apparatuses controlling voltage on a power distribution line, a local voltage control device adjusting a voltage value controlled by the voltage control apparatuses such that it is maintained within a range between voltage upper-and-lower-limit values updated every first cycle, a voltage and power-flow measurement device calculating and transmitting fluctuation-band information indicating fluctuation band of the voltage every third cycle longer than a second cycle based on voltage on the power distribution line measured every second cycle shorter than the first cycle, and a centralized voltage control device. The centralized voltage control device includes a voltage-fluctuation-band calculation unit calculating fluctuation band within the first cycle, an optimal-voltage-distribution determination unit determining a threshold value for allowance for each of upper and lower limits of an appropriate voltage range and acquiring an optimal control amount, and a voltage upper-and-lower-limit-value determination unit.

主权项

1. A voltage monitoring control system comprising:
a plurality of voltage control apparatuses that are connected to a power distribution line in a high-voltage system and control a voltage on the power distribution line; a plurality of local voltage control devices to adjust an amount of control of the voltage control apparatuses such that a voltage value controlled by the voltage control apparatuses is maintained within a range between a voltage upper-limit value and a voltage lower-limit value that are updated every first cycle; a measurement device that is connected to the power distribution line, that measures a voltage on the power distribution line every second cycle, which is shorter than the first cycle, that calculates fluctuation-band information, which indicates a fluctuation band of the voltage, on a basis of a measured voltage every third cycle, which is longer than the second cycle, and that transmits the fluctuation-band information; and a voltage monitoring control device that is connected to the local voltage control devices and the measurement device via a communication network, wherein the voltage monitoring control device includes
a transceiver unit to communicate with the local voltage control devices via the communication network and receive the fluctuation-band information from the measurement device via the communication network,a voltage-fluctuation-band calculation unit to calculate a fluctuation band of the voltage within the first cycle on a basis of the fluctuation-band information,a control-target-voltage determination unit to determine a first threshold value for an allowance for an upper limit of an appropriate voltage range and a second threshold value for an allowance for a lower limit of an appropriate voltage range on a basis of the fluctuation band calculated by the voltage-fluctuation-band calculation unit, and to determine a control target value to be indicated to each of the local voltage control devices on a basis of a difference between the first threshold value and the allowance for the upper limit and on a basis of a difference between the second threshold value and the allowance for the lower limit, anda voltage upper-and-lower-limit-value determination unit to determine a voltage upper-limit value and a voltage lower-limit value to be transmitted to each of the local voltage control devices via the transceiver unit on a basis of the control target value.