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Distribution network voltage low-frequency oscillation suppression method

A low-frequency oscillation and power distribution network technology, applied in the direction of reducing/preventing power oscillation, harmonic reduction device, AC network to reduce harmonics/ripple, etc., can solve the problem of lack of dynamic coordination ability, limiting PSS to suppress low-frequency oscillation, etc. , to achieve the effect of improving stability and reliability, suppressing low-frequency oscillation of voltage, and low cost

Active Publication Date: 2011-11-02
辽宁荣信电力电子技术有限公司
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Problems solved by technology

PSS, TCSC and SVC can improve the stability of the system and suppress the low-frequency oscillation of the grid voltage. When fully considering the comprehensive benefits, the PSS technology is superior to the TCSC and SVC. It is the most economical and effective measure, but the PSS is limited to local local information. , lack of dynamic coordination ability, which severely limits the effect of PSS to suppress low-frequency oscillations

Method used

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  • Distribution network voltage low-frequency oscillation suppression method
  • Distribution network voltage low-frequency oscillation suppression method
  • Distribution network voltage low-frequency oscillation suppression method

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Embodiment Construction

[0051] Describe the specific embodiment of the utility model in detail below in conjunction with accompanying drawing.

[0052] See figure 1 , a low-frequency oscillation suppression method for distribution network voltage, the SVG device is connected to the power grid through a reactor or directly in parallel, by detecting the inter-harmonic current in the power grid, the SVG output inter-harmonic current is changed through the harmonic current control link The equivalent impedance of the system can suppress the low-frequency oscillation phenomenon of the distribution network voltage.

[0053] figure 2 It is a schematic diagram of the principle of suppressing interharmonics of the SVG device. The harmonic current control link uses the PI regulator to feedback the command current and the output current of the SVG device to obtain a modulated wave signal, and then obtain a drive signal through PWM modulation; control the SVG output command current

[0054] According to the ...

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Abstract

The invention relates to a distribution network voltage low-frequency oscillation suppression method. The method comprises the following steps of: connecting static var generator (SVG) devices in parallel to a power grid by using reactors or directly, detecting interharmonic current in the power grid, and causing the SVG devices to output the interharmonic current by using a harmonic current control link to change the equivalent impedance of a system to suppress distribution network voltage low-frequency oscillation phenomena. In the method, fully-controlled converter SVG structures are adopted, command current is output by a given SVG, and the equivalent impedance of the power grid is changed by a proportion integration differentiation (PID) regulator, so the low-frequency oscillation of distribution network side voltage can be effectively suppressed, quick response and high tracking accuracy are ensured, and the stability and reliability of the power grid can be greatly improved.

Description

technical field [0001] The invention relates to a method for suppressing low-frequency oscillation of distribution network voltage, in particular to a method for suppressing low-frequency oscillation of distribution network side voltage using a fully-controlled converter device SVG device. Background technique [0002] With the increasing scale of the power grid and the sharp increase in the load level of the power grid, the problem of harmonics has become increasingly prominent. The harmonic signal in the load current may resonate with the grid system impedance or the reactive power compensation device in the system, causing resonance amplification and causing load overvoltage protection. Harmonic current usually refers to the harmonics of integer multiples of grid frequency, but there are also harmonics of non-integer multiples, which are called inter-harmonics. When the interharmonic near the grid frequency resonates with the grid impedance, the grid voltage amplitude wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/01
CPCY02E40/40
Inventor 郭自勇孙贤大王绪宝杨洋吴然孔祥声崔效毓杨永飞巩学军霍煜石华楷
Owner 辽宁荣信电力电子技术有限公司
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