Voltage monitoring control device and voltage monitoring control method

Abstract

The centralized voltage control device (8) of the present invention is connected to the first local voltage control device and the second local voltage control device, and the first local voltage control device adjusts the control amount in the second cycle so that the transformer-type voltage control The voltage of the equipment is maintained within the range of the upper and lower limits of the voltage updated in the first period, and the second local voltage control device adjusts the control amount of the reactive power adjustment type voltage control equipment in the third period, including: A load generation amount forecasting unit (21) for predicting load generation amount distribution under the conditions of average load and average power generation, minimum load and maximum power generation, and maximum load and minimum power generation in the first cycle; load-based power generation amount A voltage fluctuation range prediction unit (22) that distributes and predicts the voltage fluctuation range; determines a threshold value for a margin to an upper limit and a lower limit of an appropriate voltage range based on the voltage fluctuation range, and determines based on a difference between the margin to the upper limit and the lower limit and the threshold value An optimal voltage distribution determination unit (24) for the control target value of the first local voltage control device; and a voltage upper and lower limit value determination unit (25) for determining upper and lower voltage limit values ​​to be sent to the first local voltage control device based on the control target value .

Description

technical field [0001] The invention relates to a voltage monitoring and controlling device and a voltage monitoring and controlling method. Background technique [0002] The power distribution system generally consists of a high-voltage system (usually 6600V) and a low-voltage system (eg, 100V-200V), and the power receiving end of a general household is connected to the low-voltage system. The electric power company is obliged to maintain the voltage of the power receiving end of a general household within an appropriate range (eg, maintain the voltage at 95V to 107V when receiving 100V power supply). To this end, the power company adjusts the voltage of the voltage control equipment connected to the high voltage system (for example, LRT (Load Ratio Control Transformer: transformer with load tap changer) or SVR (Step Voltage Regulator: step voltage regulator), etc.) The amount of control (such as the operation of taps) is used to try to maintain the voltage at the receivin...

AI Technical Summary

Problems solved by technology

However, in recent years, due to the diversification of the use of electric power and the popularization of distributed power sources based on solar power generation, etc., the load distribution of the power distribution system tends to fluctuate greatly and non-uniformly over time. Therefore, using Voltage control of existing power distribution systems to maintain proper voltage becomes more difficult

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