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Three-phase voltage type SVPWM rectifier

A three-phase voltage rectifier technology, applied in the field of rectifiers, can solve the problems of grid harmonic pollution, affecting power quality, and high cost, and achieve the effects of suppressing harmonic pollution, improving power quality, and high power factor

Inactive Publication Date: 2018-03-09
刘铮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is only a remedial, negative and passive "cure" measure
At the same time, there are disadvantages: the passive filter is easy to resonate with the system in parallel, resulting in harmonic amplification; or it can only be effective in one aspect of harmonic suppression or reactive power compensation, and cannot combine the two well.
And the cost is high and the control is complicated
The traditional uncontrollable diode and thyristor phase-controlled rectification is the main source of harmonic pollution in the power grid, and at the same time causes a large amount of reactive power to flow in the system, seriously affecting the power quality

Method used

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  • Three-phase voltage type SVPWM rectifier
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  • Three-phase voltage type SVPWM rectifier

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Embodiment Construction

[0015] specific implementation plan

[0016] figure 1 Among them, it consists of AC side voltage source, three-phase filter inductor, three-phase fully controlled bridge, DC side filter capacitor and load. ua, ub, uc represent the three-phase voltage source voltage of the AC side respectively. udc is the output voltage of the DC side filter capacitor. ia, ib, and ic respectively represent the instantaneous values ​​of the three-phase currents on the AC side. T1-T6 are rectifier power switch tubes IGBT. L and Rre are the filter inductance value and equivalent resistance of the AC side respectively. AC side inductance. The main function is to limit the high-order harmonic current generated by the switching device. Its value should be appropriate. It is a necessary condition to ensure the normal operation of the three-phase voltage type rectifier.

[0017] figure 2 , due to the coupling between voltages and currents in the three-phase stationary coordinate system. The ...

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Abstract

The invention discloses a three-phase voltage type SVPWM rectifier, which comprises three parts: a main circuit of the SVPWM rectifier, decoupling control and SVPWM modulation. The three-phase voltage rectifier is an active and effective method to suppress harmonic pollution and improve power quality. It has the advantages of realizing sinusoidal input current at the grid side, high power factor, low harmonic pollution, constant DC voltage control, and bidirectional flow of energy. The present invention proposes to design the minimum capacitance value according to the maximum rising rate of the active current and the maximum falling rate of the DC voltage. The design of the rectifier control system is to realize the non-coupling and independent control of the active and reactive components of the rectifier grid side through the introduction of ip feed-forward compensation decoupling control.

Description

Technical field [0001] The invention relates to a rectifier, in particular to a three-phase voltage type SVPWM rectifier. Background technique [0002] There are two main ways to solve the grid pollution: one is to add a compensator to compensate the harmonics in the grid. Such as active power filter, static var compensation, etc.; the other is to design a rectifier with sinusoidal input current, low harmonic content, and high power factor. It should be said that harmonic suppression or compensation devices such as passive and active power filters can suppress or compensate harmonics and reactive power in the grid. But it is only a remedial, negative and passive "cure" measure. At the same time, there are disadvantages: the passive filter is easy to resonate with the system in parallel, resulting in harmonic amplification; or it can only be effective in one aspect of harmonic suppression or reactive power compensation, and cannot combine the two well. And the cost is high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M7/217H02M1/12
CPCH02M7/219H02M1/12H02M7/2173
Inventor 刘铮
Owner 刘铮
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