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A Circulating Current Suppression Method of Three-phase Inverter During Droop Control

A three-phase inverter, control process technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, AC network circuits, electrical components, etc., can solve problems such as limited circulating current suppression capability

Active Publication Date: 2021-08-20
HARBIN ENG UNIV
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Problems solved by technology

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a three-phase inverter in the droop control process that can solve the problem that the traditional virtual impedance has limited ability to suppress the circulating current in the parallel operation of the inverter. Circulation Suppression Method

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  • A Circulating Current Suppression Method of Three-phase Inverter During Droop Control
  • A Circulating Current Suppression Method of Three-phase Inverter During Droop Control
  • A Circulating Current Suppression Method of Three-phase Inverter During Droop Control

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[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The embodiments described here are only for explaining the present invention, rather than limiting the present invention.

[0032] Aiming at the problem that the traditional virtual impedance has limited ability to suppress the circulating current in the parallel operation of the inverters in the droop control process, the present invention provides a method that can adjust the impedance in real time to suppress the circulating current. By using a band-pass filter to extract the fundamental frequency components in the output current and the load current, and then using the phase-locked loop to obtain the phase of the output current and the load current, the difference between the two phases is used as the input of the regulator, and the output of the regulator That is, the required equivalent impedance difference, and the above-mentioned equivalent impeda...

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Abstract

The invention relates to a method for suppressing the circulation of a three-phase inverter during the droop control process. It includes the following steps: (1) Determine the required equivalent impedance difference type according to the adopted droop control equation; (2) Calculate the equivalent impedance difference that makes the inverter circulating current zero according to the relationship between the equivalent impedance difference and the circulating current. The effective resistance difference or the equivalent reactance difference (3) introduces the equivalent impedance difference that makes the inverter circulating current to zero as a virtual impedance into the system to suppress the circulating current. The invention solves the problems that the traditional method of introducing virtual impedance suppresses the parallel circulating current of inverters, which is difficult to measure the impedance and has limited suppressing ability, realizes the real-time adjustment of virtual impedance, and can suppress the circulating current for different working conditions.

Description

technical field [0001] The invention relates to the fields of power conversion devices and distributed power sources, in particular to a method for suppressing circulating current of three-phase inverters during parallel operation. Background technique [0002] A microgrid usually contains multiple distributed power sources, and the spatial distribution of distributed power sources is decentralized, and the line impedance from each inverter to the load is usually inconsistent, resulting in circulating currents between the inverters, making the output of each inverter Unequal distribution of power. When the circulating current is severe, it may even cause the inverter to limit the protection and stop running, which will cause a chain reaction. Therefore, the inverter parallel system is required to have a good current sharing effect. [0003] Droop control controls the inverter by simulating the frequency and amplitude droop characteristics of the external characteristics of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02H9/02
CPCH02H9/02H02J3/381
Inventor 张敬南李明孟繁荣程鹏张强
Owner HARBIN ENG UNIV
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