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Control method for suppressing SVG harmonic resonance

A control method and a technology of total harmonic distortion rate, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, flexible AC transmission systems, etc., can solve the problem of low response speed of SVG dynamic compensation and meet the requirements of Reactive power compensation adjusts the response speed, improves stability, and suppresses the effects of harmonic resonance

Active Publication Date: 2019-05-24
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] The invention provides a control method for suppressing SVG harmonic resonance to solve the problem of SVG harmonic resonance and low response speed of SVG dynamic compensation

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  • Control method for suppressing SVG harmonic resonance
  • Control method for suppressing SVG harmonic resonance
  • Control method for suppressing SVG harmonic resonance

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Embodiment Construction

[0041] Please refer to the attached figure 1 , with figure 1 A typical existing SVG control principle block diagram provided by the embodiment of the present application is shown. as attached figure 1 As shown, the existing typical SVG control principle is: the SVG controller collects the voltage and current signal u of the SVG grid-connected side a , u b , u c i a i b i c , phase-lock the voltage signal through a phase-locked loop (PLL, Phase Locked Loop), and determine the voltage phase θ of the SVG grid-connected point. According to the voltage phase θ, the 3S / 2S coordinate transformation is performed on the three-phase current signal, and the current value i in the three-phase static coordinate system is a i b i c Transformed into the current i in the two-phase rotating coordinate system d i q , for the current inner loop control of the SVG controller. The current inner loop control uses a PI controller to form a closed-loop feedback control, and the current r...

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Abstract

The invention provides a control method for suppressing SVG harmonic resonance. The control method determines a voltage total harmonic distortion rate and a current total harmonic distortion rate according to a voltage signal and a current signal of an SVG grid-connected side, thereby determining the maximum voltage total harmonic distortion rate and the maximum current total harmonic distortion rate. The SVG controller parameters are automatically selected and switched by comparing the maximum voltage total harmonic distortion rate and the maximum current total harmonic distortion rate with afirst preset threshold and a second preset threshold, the phase margin of the SVG control system is increased, the impedance characteristics of the SVG system are changed, the harmonic resonance generated by the SVG and the system are thus suppressed, continuous harmonic amplification is avoided, and the stability of the power system is improved. The control method provided by the invention is simple to implement, does not need to add additional hardware equipment, can meet the reactive power compensation adjustment response speed in the normal operation of the SVG, and can suppress the harmonic resonance when the harmonic resonance occurs, thereby improving the reliable operation of the SVG.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a control method for suppressing SVG harmonic resonance. Background technique [0002] A static var generator (Static Var Generator, SVG) is a device that uses a converter composed of power electronic devices that can be shut down to achieve dynamic var compensation. The function of SVG is equivalent to a controllable reactive power supply. Its reactive current can quickly follow the change of load reactive current, and then automatically compensate the reactive power required by the grid system to realize the dynamic control of grid reactive power. Reactive power compensation. Compared with other reactive power compensation equipment, SVG has the ability to continuously adjust the compensation current in both directions within the capacitive and inductive ranges. At the same time, SVG also has the characteristics of fast dynamic response and small harmonic content of co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/10Y02E40/40
Inventor 何鑫许守东邢超郭成刘明群覃日升李胜男陈勇徐志
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST