Unequal capacity grouping method for substation shunt compensation capacitor bank

Abstract

The invention discloses an unequal capacity grouping method for a substation shunt compensation capacitor bank. The method comprises the steps of acquiring the reactive power demanded quantities of the substation at n times; using the reactive power demanded quantities at the n times as samples; dividing n samples in a reactive power demand time series curve to obtain the optimal S reactive powerdemand time series; confirming the samples in each reactive power demand time series based on an objective function F(n, S); and finally, determining the number of the capacitor banks and the capacityof each capacitor bank based on the S reactive power demand time series. The method carefully takes account of the dynamic variation characteristics of a load, obtains reasonable capacities of the capacitors and reduces the number of times of switching in and off the capacitor banks.

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 substation reactive power compensation is to compensate the reactive power shortage of the network 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 condensers, shunt capacitors, shunt reactors, static var compensation devices, etc. Among them, shunt capacitors are widely used due to their simple operation and maintenance and good economy. However, due to the lifespan and maintenance of capacitor banks, the switching times are strictly limited, so the grouping of cap...

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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