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Method for suppressing circulating current of three-phase rectifier

A three-phase rectifier and circulating current suppression technology, which is applied in the direction of irreversible AC power input conversion to DC power output, can solve the problems of increasing system cost, weight and volume, and achieve easy modular design, improved reliability and efficiency, cost reduction effect

Inactive Publication Date: 2017-06-20
张凤军
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  • Application Information

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Problems solved by technology

Although these methods can effectively reduce the size of the circulation, they all increase the cost, weight and volume of the system

Method used

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  • Method for suppressing circulating current of three-phase rectifier
  • Method for suppressing circulating current of three-phase rectifier

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Embodiment Construction

[0015] specific implementation plan

[0016] figure 1 Among them, a, b, and c are the three phases of the AC side, a1, b1, and c1 are the three phases of the rectifier 1, respectively, a2, b2, and c2 are the three phases of the rectifier 2, and N, P are the negative and positive poles of the DC side, respectively. When the trigger pulse time of the upper and lower sets of three-phase rectifiers is inconsistent, the two sets of rectifiers will work asynchronously. At this time, the current may flow through the two sets of rectifiers at the same time, thus forming a circulating current. Taking the two phases a and b as an example, when the upper bridge arm of phase a and the lower bridge arm of phase b of the two rectifiers are turned on, the current loop is shown in Figure 1. When the timing of the trigger pulses of the upper and lower sets of rectifiers is not completely synchronized, a current loop P-a1-a-a2-N-P will be formed. Such current loops also exist between phase a ...

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Abstract

The invention discloses a method for suppressing circulation of a three-phase rectifier, which comprises three parts: a three-phase rectifier with a common direct current bus, zero vector control, and space vector pulse width modulation (SVPWM). The invention establishes a model of zero-sequence circulating current on the basis of the average model of parallel three-phase rectifiers, and suppresses circulating current by controlling the action time of zero vector V7 (111) in one switching cycle. It is beneficial to the direct parallel operation of the rectifiers and can improve the reliability and efficiency of the system, reduce the cost, and is easy to modularize the design.

Description

technical field [0001] The invention relates to a three-phase rectifier, in particular to a method for suppressing circulation of the three-phase rectifier. Background technique [0002] With the gradual strengthening of environmental protection awareness and the increasingly prominent energy demand, new energy technology has increasingly become a research hotspot for scholars. As one of the core technologies of new energy, rectifiers have been widely used in power supply and distribution systems. In order to meet the system's requirements on capacity and reliability, the parallel connection technology of rectifiers is widely used. The parallel connection technology of rectifiers can not only improve the power level, reliability and efficiency of the whole system, reduce the ripple of current and voltage, but also benefit the modules of the system Modernized design, easy to reconfigure the system, and improve the flexibility of the system. [0003] Direct parallel operatio...

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Application Information

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IPC IPC(8): H02M7/12
CPCH02M7/12
Inventor 张凤军
Owner 张凤军