Intelligent high-precision dynamic reactive compensation control system

Abstract

The invention discloses an intelligent high-precision dynamic reactive compensation control system comprising a plurality of capacitor groups and corresponding capacitor group switching switch loops thereof. The intelligent high-precision dynamic reactive compensation control system further comprises a three-phase current and voltage signal detecting unit, a master control unit and auxiliary control units, wherein the auxiliary control units are respectively arranged in the capacitor group switching switch loops; the three-phase current and voltage signal detecting unit is used for detecting three-phase current signals and three-phase voltage signals and transmitting detecting results to the master control unit; the master control unit calculates reactive compensation quantity to be invested according to the received three-phase current signals and the three-phase voltage signals and transmits commands to the corresponding auxiliary control units according to built-in programs, and the corresponding auxiliary control units get through the corresponding capacitor group switching switch loops. The intelligent high-precision dynamic reactive compensation control system is high in measuring precision and quick and correct to compensate by investing the calculated reactive compensation quantity to be invested to the corresponding compensation capacitor groups.

Description

technical field [0001] The invention relates to a reactive power compensation control system, in particular to an intelligent high-precision dynamic reactive power compensation control system. Background technique [0002] Reactive power is an important basis to reflect the quality of the power grid, so the power factor is very representative as a parameter of the power system. The corresponding reactive power compensation technology can not only improve the power factor of the grid, minimize the reactive power of the grid, but also reduce network loss, save power, and improve the transmission capacity of lines and transformers. [0003] In the low-voltage power distribution system, most of the electrical equipment are inductive loads, which cause the current phase to lag behind the voltage phase, so that the power energy is consumed on the grid transmission line, resulting in a serious decline in the quality of the grid power supply. Therefore, corresponding compensation m...

AI Technical Summary

Problems solved by technology

[0005] The circuit design is complex, the detection and sampling accuracy is poor, the calculation of reactive power has large errors, the compensation accuracy is poor, the response speed is slow, and the ability to resist harmonic interference is weak. When the power grid has large fluctuations, it is easy to malfunction

On the other hand, due to the poor detection accuracy of the detection circuit, the switching capacitor bank is only judged according to the current grid parameters, and the switching capacitor capacity has a large error, so switching oscillations often occur

Long-term vibration can easily cause problems in the capacitor bank or composite switch, which will cause compensation failure and affect the power supply quality of the power system

[0006] At the same time, the above control system is based on the power factor physical quantity as the main control quantity. In the case of fast reactive power changes, the sampling accuracy is extremely poor, resulting in poor compensation accuracy.

[0007] The control compensation method can only achieve common compensation, resulting in three-phase compensation and compensation balance, and it is also prone to over-compensation or under-compensation

[0008] Furthermore, the control system has only one capacitor capacity encoding program, and each capacitor capacity is the same, and it is easy to cause over-compensation or under-compensation of a certain phase during compensation.

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