Reactive compensation capacitor switching control method
A technology for compensating capacitors and capacitor switching, applied in reactive power compensation, reactive power adjustment/elimination/compensation, electrical components, etc., to reduce instantaneous under-compensation and improve the effect of reactive power compensation
Active Publication Date: 2020-02-28
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a switching control method for reactive power compensation capacitors, which can reduce instantaneous under-compensation and over-compensation caused by disorderly switching between capacitor banks of different capacities during the switching process of reactive power compensation capacity. Compensation effects, as well as solve the problem of capacitor selection and service life optimization in constant capacitance compensation
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[0023] In order to better understand the technical solution of the present invention, the following will be described in detail through specific examples:
[0024] see figure 1 , the specific flow of a reactive power compensation capacitor switching control method of the present invention is as follows: first judge the reactive load change trend according to the reactive load curve of the previous day, then collect real-time parameters of the power grid, and calculate the reactive power demand at this time; then Judging whether the capacity of the compensation capacitor is allowed to increase or decrease according to the real-time reactive power and the historical reactive load change trend, and determine whether to allow switching of the capacitor; The principle of average number of times, select the cut-off with the most number of times of operation, select the input with the least number of times of operation, choose the cut-off with the longest operation time, and select t...
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The invention discloses a reactive compensation capacitor switching control method, which aims at an existing TSC type reactive compensation device and is used for controlling selection of an equal-capacity capacitor matched with the TSC type reactive compensation device and switching-on and switching-off actions of an unequal-capacity capacitor bank in sequence. The method comprises the five steps of reactive load trend judgment, reactive power demand calculation, judgment of whether the capacity of the compensation capacitor is allowed to be increased or decreased, capacitor selection and capacitor switching sequence judgment. By using the control method provided by the invention, the influence of instant under-compensation and overcompensation caused by disordered switching among unequal-capacity capacitor banks in the reactive compensation capacity switching process can be reduced, and the problems of capacitor selection and service life optimization during equal-capacity compensation can be solved. The control method has important significance for improving the reactive compensation effect, the voltage quality and the economical efficiency of a power distribution network.
Description
technical field [0001] The invention relates to a reactive power compensation capacitor switching control method used in the technical field of reactive power compensation in distribution networks. Background technique [0002] With the rapid increase of economic development and power load, the demand for reactive power compensation is increasing day by day. The national standard GB50227 "Code for Design of Parallel Capacitor Devices" stipulates: "The group capacity of capacitor groups should be determined according to the principle of increasing the capacity of a single group and reducing the number of groups", but it does not stipulate the group capacity of capacitors and the adjustment step size. There are two ways of grouping with capacity and group without capacity. The number of groups that can be combined with equal capacity is limited, and some capacitors run for a long time or are switched multiple times, resulting in a sharp drop in service life; groups with diffe...
Claims
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CPCH02J3/1864Y02E40/30
Inventor 余浩斌吴爱军王强陈玉辉于琨琨岳亮缪进荣王乾戴军瑛戴人杰
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO