A Grouping Method of Unequal Capacities for Parallel Compensation Capacitor Banks in Substations

Abstract

The invention discloses a substation parallel compensation capacitor bank unequal capacity grouping method, which collects the reactive power demands of the substation at n moments, and takes the reactive power demands of the n moments as samples, and then calculates the reactive power demand timing curve The n samples are divided to obtain the optimal S-segment reactive power demand time series, and the samples in each segment of reactive power demand time series are confirmed based on the objective function F(n,S), and finally the capacitor bank is determined based on the S-segment reactive power demand time series The number and the capacity of each group of capacitors; the present invention carefully considers the dynamic change characteristics of the load through the above method, obtains a more reasonable capacitor capacity, and reduces the number of times of putting in and removing capacitor groups.

Description

technical field [0001] The invention belongs to the technical field of reactive power compensation in substations, and in particular relates to a method for grouping unequal capacities of parallel compensation capacitor banks in substations. Background technique [0002] The main function of the substation reactive power compensation is to compensate the network reactive power shortage and the reactive power loss of the main transformer, which can improve the power quality, reduce the network loss, and make the system operate safely and economically. At present, there are a variety of reactive power compensation methods in substations, such as synchronous phase conditioners, shunt capacitors, shunt reactors, static reactive power compensation devices, etc. Among them, shunt capacitors are widely used due to their simple operation and maintenance and good economy. However, due to reasons such as life and maintenance of capacitor banks, the switching times of capacitor banks a...

AI Technical Summary

Problems solved by technology

But the operation is not flexible enough, and there are few compensation capacity schemes that can be combined

Grouping with unequal capacity mainly includes two forms: differential grouping and proportional grouping. Its characteristic is that various compensation schemes can be realized by combining capacitor banks with different capacities to adapt to various load levels, but the running time of each capacitor bank is quite different. Increased operation and maintenance costs, and complex control schemes

The optimal coverage method is commonly used in the grouping of capacitor banks with different capacities. This method is based on the probability distribution curve of reactive power demand, and the input curve of capacitor bank is used to fit the probability distribution curve. However, the existing method does not consider the time sequence of reactive power demand. If the actual reactive power demand curve fluctuates greatly, it will cause frequent input and removal of capacitor banks, which will adversely affect the equipment

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