Three-phase parallel connection inverter system circulating current inhibiting method based on SVM strategy

An inverter system and circulating current suppression technology, applied in the direction of converting AC power input to DC power output, output power conversion device, climate sustainability, etc., to reduce switching frequency, reduce switching loss, and phase current waveform distortion. the effect of elimination

Active Publication Date: 2017-05-31
SHANDONG UNIV
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Problems solved by technology

[0005] In order to solve the problem of zero-sequence circulation existing in distributed power generation occasions such as photovoltaic power generation and micro-grids in which no control method in the prior art can be applied to the modular parallel operation of inverters, the present invention provides a method based on real-time adjustment using SVM Strategic three-phase parallel inverter system circulation suppression method, this method combines the latest three-vector combination principle (NTV) modulation method to synthesize SVM, and can suppress the circulation current only by adjusting the switch conduction time

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  • Three-phase parallel connection inverter system circulating current inhibiting method based on SVM strategy

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[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0038] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention discloses a three-phase parallel connection inverter system circulating current inhibiting method based on an SVM strategy. The method is based on the two-level topology and SVM modulation strategy; the key technology of the three-phase two-level inverter parallel connection control operation is studied; the zero sequence ring current and switch loss problem generated by a common direct current bus parallel connection inverter is analyzed in detail; the SVM strategy can be used for inhibiting the zero sequence ring current of the parallel connection inverter. In order to solve the problem that no control method can be applied to the zero sequence ring current in the distributive power generation occasions of photovoltaic power generation, microgrid and the like of the inverter modularized parallel connection operation in the prior art. The NTV (Nearest Three Vector) synthesis principle modulation method is used for synthesizing the SVM; the ring current can be inhibited through regulating the switch conduction time. In addition, the method can reduce the switch loss. By using the SVM method, the ring current can be inhibited under the conditions of no additional hardware or complicated controller.

Description

technical field [0001] The invention relates to a three-phase parallel inverter system circulation suppression method based on an SVM strategy. Background technique [0002] With the large-scale access of distributed energy including photovoltaic power generation systems to low-voltage distribution networks, power conversion is developing in the direction of high-power, and it is difficult for a traditional single inverter to meet the requirements for output current in low-voltage and high-current applications. The emergence of modular parallel operation of inverters solves the above problems, such as figure 1 As shown, compared with the traditional single inverter scheme, the redundancy of modular parallel operation of the inverter is increased, and the reliability is enhanced. Even if a parallel module fails, it can be removed and used after derating; Moreover, the modularized parallel operation of the inverter is more suitable for high-current occasions, and has the adva...

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Application Information

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IPC IPC(8): H02M7/493H02M7/5395
CPCH02M7/493H02M7/5395H02M1/0038H02M1/0054Y02B70/10Y02E10/56
Inventor 张承慧杨梦盈邢相洋秦昌伟
Owner SHANDONG UNIV
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