Automatic master-slave parallel control method for sine pulse width modulation inverter power supply

A sinusoidal pulse width modulation, inverter power technology, applied in the electrical field, can solve the problems of signal attenuation, system paralysis, unsuitable for long-distance laying, etc.

Inactive Publication Date: 2003-10-22
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the master-slave control method also has some shortcomings: the existence of the master module makes it not a redundant system. Once the master module fails, the entire system will be paralyzed; the stability of the system depends on the number of parallel slave modules; There is a current command signal line between them, which should not be laid for a long distance, otherwise the signal will be greatly attenuated, the interference will be serious, and the phase will be seriously lagged
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  • Automatic master-slave parallel control method for sine pulse width modulation inverter power supply
  • Automatic master-slave parallel control method for sine pulse width modulation inverter power supply
  • Automatic master-slave parallel control method for sine pulse width modulation inverter power supply

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[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and the embodiments given by the inventor.

[0019] Before introducing the specific content of the present invention, first introduce the output power characteristics of the parallel inverter power supply, and then analyze in detail the automatic master-slave parallel networking control strategy and its implementation. 5.1 Analysis of output power of parallel inverter power supply

[0020] The distributed power generation system or UPS system composed of parallel inverters is a complex system. The AC voltage output by each inverter can be equivalent to a controllable voltage source, and its frequency, phase, and amplitude must be coordinated with each other. , to jointly bear the load current, that is, to achieve load current balance control. In order to facilitate the analysis, the following takes the parallel network operation of two inverter power supplies a...

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Abstract

This invention discloses a SPWM inversion supply automatic master-slave parallel control method applying transient reactive power theory and parallel inversion supply output power performance, that is to control the output active power by converting frequency of its output voltage to control the output reactive power by converting its amplitude so as to uncouple the output active power P and reactive power Q to control the invented power source frequency/phase and amplitude. Although the system exists interlink signal line, the signal transferred by it is DC which can conveniently suppress interference of long distance transmission, so, the automatic master-slave control way is available in the distributed generation and UPS systems.

Description

1. Technical field [0001] The invention belongs to the field of electrical technology, and relates to a multi-machine parallel operation control method of a sinusoidal pulse width modulation inverter power supply in distributed power generation systems, UPS and other systems. 2. Background technology [0002] The parallel operation of multiple sinusoidal pulse width modulation inverters can expand the capacity of the system, and can also form a parallel redundant system to improve the reliability and maintainability of the system. However, parallel operation of sinusoidal PWM inverters is relatively difficult, because the frequencies, phases and amplitudes of all sinusoidal PWM inverters operating in parallel must be the same, otherwise, there will be a lot of problems between the inverters. Large circulating current, excessive circulating current will increase the burden on the inverter, and divergent circulating current will cause the system to collapse and cause power sup...

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Application Information

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IPC IPC(8): H02J3/38
Inventor 姜桂宾裴云庆王峰王兆安
Owner XI AN JIAOTONG UNIV
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