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Three-phase four-leg pwm control method applicable to reactive power compensation

A technology of three-phase four-bridge arm and control method, which is applied in the direction of reactive power compensation, reactive power adjustment/elimination/compensation, output power conversion device, etc., can solve problems such as three-phase unbalance, and achieve good system stability Effect

Inactive Publication Date: 2016-10-26
国船电气(武汉)有限公司
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  • Abstract
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Problems solved by technology

However, when DSVG adopts a three-phase four-leg control structure, it will encounter a problem. The three-phase four-leg control structure is prone to three-phase unbalance under low voltage conditions, which will cause great damage to the final compensation structure. However, the existing control technologies are all aimed at compensating under high-voltage conditions, so it is necessary to design a special control method for low-voltage conditions to solve this problem

Method used

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  • Three-phase four-leg pwm control method applicable to reactive power compensation
  • Three-phase four-leg pwm control method applicable to reactive power compensation
  • Three-phase four-leg pwm control method applicable to reactive power compensation

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] The embodiment of the present invention samples the three-phase voltage signal and the three-phase current signal within one cycle, and uses the three-phase voltage signal and the three-phase current signal as the first-level input quantity to obtain the second-level input quantity Ualfa after CLARK transformation and PARK transformation , Ubeta, Ugamma, and then obtain the PWM output signal for driving the switching device on the three-phase four-leg switching device through the following steps of the second-stage input quantity,

[0034] Step 1, determine the switch state vector by the working state of each group of bridge arms of the three-phase four bridge arms, and form the SVPWM control coordinate system by the obtained N switch state vectors. The specific method is to guide the upper bridge arm of each group of bridge arms to The off state of th...

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Abstract

The invention relates to a three-phase four-leg pwm control method applicable to reactive power compensation, which is characterized in that three-phase voltage signals and three-phase current signals in a period are sampled, the three-phase voltage signals and the three-phase current signals are used as first-stage input quantities, second-stage input quantities Ualfa, Ubeta, Ugamma are acquired through carrying out CLARK transform and PARK transform on the first-stage input quantities, and then PWM output signals for driving a switching device on three phases and four legs are acquired through performing the following steps on the second-stage input quantities. The pwn control method provided by the invention has the advantages that three phases and four legs can operate smoothly, reactive compensation for a system can be performed quickly and accurately, and the system stability is better.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation control, in particular to a PWM control method for three-phase four-bridge arms suitable for reactive power compensation. Background technique [0002] The low-voltage active reactive power compensation (DSVG) controller uses IGBT as the switching element, connects the self-commutated bridge circuit in parallel with the power grid through the reactor, and properly adjusts the phase and amplitude of the output voltage of the AC side of the bridge circuit, so that the The circuit absorbs or sends out reactive current that meets the requirements to realize dynamic reactive power compensation. The device has a fast adjustment speed and a wide operating range. Adopting an appropriate switching frequency can greatly reduce the harmonic content in the compensation current, effectively improve the power factor of the electric load, and have a significant energy-saving effect. However,...

Claims

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Application Information

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IPC IPC(8): H02M5/293H02J3/18
CPCH02J3/1857H02M5/293H02M5/2932Y02E40/30
Inventor 王珏周莉詹棋智宋泽宇钱飞黄伟刘勇
Owner 国船电气(武汉)有限公司
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