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A Phase Sequence Adaptive Control Method for Three-phase PWM Rectifier

An adaptive control and rectifier technology, which is applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc.

Active Publication Date: 2019-07-19
西安费米人工智能有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current three-phase PWM rectifier either does not have the phase sequence self-judgment function, or can judge the phase sequence, but the device cannot operate normally under the wrong phase sequence

Method used

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  • A Phase Sequence Adaptive Control Method for Three-phase PWM Rectifier
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  • A Phase Sequence Adaptive Control Method for Three-phase PWM Rectifier

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Embodiment Construction

[0037] Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in further detail:

[0038] Such as figure 1 Shown is the PWM rectifier topology. The three-phase voltage-type inverter is connected to the power grid through a three-phase reactor, and there is an energy storage capacitor on the DC side, and the voltage regulation and sinusoidalization of the input current are realized through the switching action of the voltage-type converter.

[0039] The implementation steps of the phase sequence adaptive control method of the three-phase PWM rectifier proposed by the present invention are as follows:

[0040] 1. Soft-lock phase adaptive algorithm such as figure 2 Shown:

[0041] a. Collect the voltage of the three-phase grid (when it is unknown whether the phase is wrong), assuming that the phase sequence flag is positive phase sequence 1.

[0042] b. Use the instantaneous reactive power coordinate transformation formula ...

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Abstract

The invention discloses a phase sequence self-adaption control method of a three-phase PWM rectifier. The method comprises the steps that the positive phase sequence and the negative phase sequence ofnetwork voltage are accurately identified through an improved soft phase-locked loop, and the positive-sequence phase angle of the network voltage is accurately locked all the time; according to thepositive and negative phase sequences of the network voltage, the phase sequence of a control algorithm is adjusted, and the normal operation of equipment is achieved under the condition of the negative-sequence network voltage. By means of the control method, artificial judgment using the field network voltage phase sequence is omitted, the problem of the normal operation of the equipment under the condition of a wrong phase sequence is solved, the control method has a very high practicable value in the application field, and the application prospect is limitless.

Description

technical field [0001] The invention belongs to the field of power electronic control and relates to a control method of a three-phase PWM rectifier. Background technique [0002] Three-phase PWM rectifiers are used more and more in the field. In many old factories and remote rural villages, there have been problems where electricians cannot identify the phase sequence of the grid voltage, or the phase sequence of the grid voltage in the entire factory and station area is reversed or wrong. Most of the equipment, in the case of wrong phase sequence, will fail or fail to operate after starting. It is necessary to cut off the power again and adjust the phase sequence. For many occasions, it may take a long time to wait for another power failure. From an engineering point of view, it is imminent to solve the normal operation of the PWM rectifier in the case of wrong phase sequence, which has very great social value. [0003] PWM rectifiers can also be extended to all grid-co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M7/2173
Inventor 阚忠杰
Owner 西安费米人工智能有限公司
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