Control method for actively suppressing power grid harmonics

A control method and active suppression technology, applied in AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the deterioration of power quality, the harm of harmonic current to electrical equipment, and endanger the safety and economy of power systems problems with operation

Inactive Publication Date: 2012-06-27
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

In practice, due to the widespread use of power electronic equipment, a large number of harmonics are generated in the power grid, and harmonic currents are very harmful to electrical equipment, which will cause serious deterioration of power quality, and have a negative impact on various electrical equipment and relay protection devices. , Computers, measuring instruments and communication systems have adverse effects, endangering the safety and economic operation of the power system
[0003] At present, the research on harmonic detection and suppression has never stopped, but because the harmonics of the power system are affected by factors such as nonlinearity, unbalance, randomness and complexity, it i...

Method used

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  • Control method for actively suppressing power grid harmonics
  • Control method for actively suppressing power grid harmonics
  • Control method for actively suppressing power grid harmonics

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[0031] The present invention will be further described below in conjunction with the accompanying drawings, the principle of active suppression of harmonics is as follows figure 1 Shown, the control principle of the inventive method is as figure 2 Shown, the device structure that the inventive method adopts is as Figure 5 As shown, this embodiment implements this method through MATLAB7.0 software, simulation experiments, and uses a three-phase voltage source to simulate the grid signal. The three-phase voltage source is connected to the input terminal of the current detection circuit, and the three-phase current is obtained as i a i b i c , the three-phase voltage source is connected to the input terminal of the three-phase uncontrollable bridge rectifier circuit, and the output terminal of the three-phase uncontrollable bridge rectifier circuit is connected to a resistive load. Three-phase current i a i b i c The AC quantities of two-phase active and reactive currents...

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Abstract

The invention provides a control method for actively suppressing power grid harmonics. A harmonic component can be precisely detected and separated by adopting a harmonic current detection method based on transient reactive power; in order to achieve a better output current control effect than the conventional proportion and integration (PI) control effect, a composite control strategy, in which fuzzy PI closed loop adjustment is taken as a core, is determined; therefore, online adjustment and optimization of PI parameters are realized; and the harmonics of a harmonic load and a device to a power grid are suppressed effectively.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a control method for actively suppressing harmonics in a power grid. Background technique [0002] With the widespread application of distributed power generation systems, its grid-connection issues have attracted more and more attention, and the harmonics and reactive power problems caused by power equipment and systems have become more and more troublesome to the grid. In practice, due to the widespread use of power electronic equipment, a large number of harmonics are generated in the power grid, and harmonic currents are very harmful to electrical equipment, which will cause serious deterioration of power quality, and have a negative impact on various electrical equipment and relay protection devices. , Computers, measuring instruments and communication systems have adverse effects, endangering the safety and economic operation of the power system. [0003] At presen...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 王湘明郭成广董磊书孙东华杨波
Owner SHENYANG POLYTECHNIC UNIV
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