Detection method of compensation command current in static synchronous compensator device of distribution network

Abstract

The invention discloses a detection method for compensating for the instruction current in a power distribution network static synchronous compensator. The difference between a direct current side capacitor voltage set value U<*>[dc] and a direct current side capacitor voltage actual value U[dc] is calculated through a direct current side capacitor voltage regulation module PID so that an equivalent active current component (see the specification) can be outputted, a fundamental wave positive sequence active component on the system side of a grid is obtained through C<-1> and C[23] matrix transformation, and then the fundamental wave positive sequence active component is subtracted from three phases of system side currents to obtain three phases of compensation instruction currents. The three phases of compensation instruction currents are added together, and the result is inverted to obtain a center line compensation instruction current i[n]. Finally, the instruction current is inputted into a hysteresis comparator to drive a main circuit to conduct compensation, and therefore only the fundamental wave positive sequence active component exists on the system side of the grid, and the aim of compensation is achieved.

Description

technical field [0001] The invention relates to a method for detecting compensation command current in a static synchronous compensator device of a distribution network, in particular to an ip-iq detection method based on the instantaneous reactive power theory that reduces the number of coordinate transformations and does not contain a filter, and belongs to the detection technology field. Background technique [0002] At present, with the rapid development of science and technology, a large number of power electronic devices are increasingly widely used in power systems, industries, transportation and households, which brings serious harmonic pollution and dynamic reactive power to the distribution network, which will cause distribution The reduction and fluctuation of the grid voltage affect the power supply quality of the distribution network. With its excellent performance, D-STATCOM has gradually become the development direction of reactive power compensation and powe...

AI Technical Summary

Problems solved by technology

However, in actual engineering use, the ip-iq detection method requires four coordinate transformations and the intermediate quantity needs to pass through the filter, which not only increases the calculation time, but also the delay generated by the filter will affect the response speed of the detection

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