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A vienna rectifier control method suitable for grid voltage disturbance

A technology of power grid voltage and control method, which is applied in the direction of AC network voltage adjustment, AC network to reduce harmonic/ripple, harmonic reduction device, etc. It can solve the problems of insufficient current tracking accuracy and achieve high current tracking accuracy.

Active Publication Date: 2019-01-18
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

[0004] The present invention is applicable to the Vienna rectifier control method under the condition that the power grid voltage is disturbed, and discloses a new scheme, which uses a phase-locked loop to extract the fundamental wave component of the voltage sampling signal as a current tracking reference signal, and solves the problem of insufficient current tracking accuracy of the existing control scheme question

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  • A vienna rectifier control method suitable for grid voltage disturbance
  • A vienna rectifier control method suitable for grid voltage disturbance
  • A vienna rectifier control method suitable for grid voltage disturbance

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with accompanying drawing.

[0019] The present invention is applicable to the Vienna rectifier control method in the case of grid voltage disturbance. An improved current tracking method based on repetitive control is disclosed. In the case of voltage disturbance, the current tracking accuracy is improved, and the control process of the grid-side current waveform quality is improved. Specifically include the following.

[0020] (1) Grid voltage harmonics and periodic collapse. By Fourier analysis of the waveform of the voltage collapse, the high-frequency harmonic components can be obtained, so it can be considered that it has the same impact as the harmonic problem on the Vienna rectifier, so it is classified as the same problem for solution.

[0021] like figure 1 As shown, the schematic diagram of the three-phase four-wire Vienna rectifier topology. Among them, the inductor L on the AC side pla...

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Abstract

The invention relates to a Vienna rectifier control method suitable for a network voltage disturbance situation, discloses an improved current tracking method based on repeated control specific to a three-phase four-wire-system rectifier, and mainly aims to overcome the defects of poor power quality and poor current tracking effect in conventional control. The Vienna rectifier control method is mainly characterized in that (1) voltage harmonic wave information is shielded by means of taking a phase-locked loop output signal as a current tracking signal specific to power grid background harmonics and periodical collapse; and (2) parallel connection of repeated control and conventional PI control is introduced, and repeated controller parameters are reasonably designed, thereby improving the current tracking effect. Compared with the prior art, the Vienna rectifier control method has the advantages that network side current quality is effectively improved, and a direct-current side voltage is kept stable.

Description

technical field [0001] The invention relates to a control method of a Vienna rectifier, in particular to a control method suitable for effectively improving the quality of a grid-side current waveform when harmonics or collapse of the grid voltage occur, and belongs to the field of grid-connected control of the grid. Background technique [0002] Power quality problems such as voltage three-phase unbalance, voltage collapse, and voltage harmonics are ubiquitous in the power grid. Such problems directly affect the reliable operation of electric loads. At present, the DC grid and the hybrid DC grid are developing rapidly. If there are harmonics in the AC grid, they will be partially injected into the DC microgrid. The harmonic current will cause fluctuations in the voltage of the DC side, which will affect the reliability of the power supply of the DC grid. At the same time The DC grid will also react against the AC grid, causing greater harm. Therefore, the rectifier is part...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J3/01
CPCH02J3/01H02J3/12Y02E40/40
Inventor 姚钢周荔丹王春阳冯文俊胡海敏杨振睿张弛钟筱怡朱淑敏
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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