Coordination control method of composite electrical load dynamic harmonic filter

Abstract

The invention provides a coordination control method of a composite electrical load dynamic harmonic filter. The composite electrical load dynamic harmonic filter is composed of a composite electrical load system, a filtering system and an intelligent detection and control system, and can realize a dynamic harmonic filtering function. The coordination control method is applied to carrying out harmonic filtering on electrical load; along with the operation of an electrical power system, when the harmonic quantity generated by composite electrical loading changes or the capacitor bank capacitive reactance in the harmonic filter changes, the condenser capacity in the filtering system and the inductance value of a variable electric reactor are controlled by an intelligent controller, and a capacitor bank is firstly switches to absorb the harmonic waves of a power grid and then tuned.

Description

technical field [0001] The invention relates to the field of electric compound load harmonic filtering, in particular to a coordinated control method for a compound electric load dynamic harmonic filter. Background technique [0002] With the rapid development of the national economy, the number of nonlinear loads and devices used in various industries is increasing, and the use is becoming wider and wider. At the same time, the harm of harmonics generated by nonlinear loads and devices to the power grid is also increasing. . Non-linear loads and devices used in industrial and commercial and residential lighting fields are the main sources of harmonics. Dynamic control of harmonics will have a multiplier effect on improving power quality and energy saving. Therefore, research on the generation, propagation, control and governance of harmonic currents in power systems is attracting great attention from academia, industry and government departments. [0003] It is the long-...

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Problems solved by technology

[0006] The Chinese patent document "A Varactor (200610019026.6)" mainly involves a reactor whose impedance value can be changed steplessly. It is mainly composed of a primary winding and a secondary winding. By applying control to the secondary winding side, it can Stepless adjustment of the impedance value on the primary winding creates conditions for the realization of intelligent control; however, in terms of harmonic filtering, dynamic filtering cannot be achieved with a single adjustment of varactors, and filtering must be achieved through coordinated control of inductance and capacitance Function

The Chinese patent document "Dynamic Tuned Filter (200910063641.0)" mainly relates to a dynamic filtering device. The application of this device can dynamically adjust the inductance of the varactor to filter out single-frequency power grid harmonics; During the use of the filter, the capacity of the capacitor will change, and the capacitive reactance will also change accordingly, but this device cannot realize the function of dynamically adjusting the capacitor bank to absorb the harmonics of the power grid and automatically tune

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