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Parallel structure of voltage source type PWM (Pulse Width Modulation) rectifier and control method of the rectifier

A technology of voltage source type and control method, which is applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., and can solve problems such as harm, system performance degradation, and normal operation of rectifiers. The problem of current sharing and the effect of avoiding circulation

Active Publication Date: 2011-08-17
保定有源电力科技有限公司
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Problems solved by technology

Since the internal resistance of each voltage source PWM rectifier is extremely small, this partial rectification and partial active inverter situation may form a large circulating current between the parallel voltage source PWM rectifiers, which will affect the normal operation of the rectifier , affecting the stability of the entire system and reducing the performance of the system; if it is serious, it will harm or even damage the voltage source PWM rectifier system connected in parallel
Therefore, parallel operation of voltage source PWM rectifiers is generally not allowed

Method used

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  • Parallel structure of voltage source type PWM (Pulse Width Modulation) rectifier and control method of the rectifier
  • Parallel structure of voltage source type PWM (Pulse Width Modulation) rectifier and control method of the rectifier
  • Parallel structure of voltage source type PWM (Pulse Width Modulation) rectifier and control method of the rectifier

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Embodiment Construction

[0019] The logical relationship of its control is as follows image 3 shown. The detailed description is as follows: The electrical topology of the main circuit is divided into parallel connection of single-phase voltage source PWM rectifiers, parallel connection of three-phase voltage source PWM rectifiers, and parallel structure of multi-module three-phase voltage source PWM rectifiers. Typical voltage source PWM Rectifier topologies such as figure 1 (a), (b) shown. The main circuit uses power switch tubes with anti-parallel diodes to form the upper (or lower) arm, and the upper and lower arms are connected in series to form a bridge arm; two bridge arms are connected in parallel to form a single-phase bridge circuit such as figure 1 (a), three bridge arms are connected in parallel to form a three-phase bridge circuit such as figure 1 (b).

[0020] The parallel structure of the single-phase voltage source type PWM rectifier means that the main circuit is composed of an u...

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Abstract

The invention discloses a parallel structure of a voltage source type PWM (Pulse Width Modulation) rectifier and a control method of the rectifier, belonging to the technical field of power electrical application. A topology circuit structure of the voltage source type PWM (Pulse Width Modulation) rectifier includes a parallel structure of a single-phase voltage source type PWM (Pulse Width Modulation) rectifier and a parallel structure of a three-phase voltage source type PWM (Pulse Width Modulation) rectifier. The control method is a vector control technology based on power system voltage orientation, which comprises the following steps of: by use of voltage outer ring and current inner ring control way, separating out an outer ring voltage regulator of a control circuit of the parallelvoltage source type PWM (Pulse Width Modulation) rectifier to form a common uniform voltage regulator, outputting a unique outer ring control voltage, simplifying a control policy into single closed ring current control to solve consistency problem of energy flow direction of the parallel voltage source type PWM(Pulse Width Modulation) rectifier so as to avoid generation of ring current and to provide technical supports for high power, modularization and large-scale application of the multi-module parallel connection of the voltage source type PWM (Pulse Width Modulation)rectifier.

Description

technical field [0001] The invention belongs to the technical field of power electronics application, and in particular relates to a parallel structure of a voltage source type PWM rectifier and a control method for the rectifier. Specifically, it is about the high-power, modular parallel technology and method of new power electronic rectifiers for distributed power supply, renewable energy power generation grid connection, charging and discharging and energy storage systems. Background technique [0002] AC-DC conversion accounts for a large proportion of the entire power electronic device, and most direct current (DC) power sources need to be rectified by alternating current (AC) power sources. Traditional rectifiers use half-wave, full-wave or bridge rectifiers composed of diodes; or phase-controlled rectifiers using thyristors, but these rectifiers have disadvantages such as low power factor and severe waveform distortion on the AC side. Since the late 1980s, PWM (Pulse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M7/219
Inventor 颜湘武曲伟董清谷建成张波冯文宏王树岐
Owner 保定有源电力科技有限公司
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