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Multi-module inverter wired parallel digital control method

A digital control and inverter technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve problems such as poor current sharing effect and complicated system control, and achieve simple control method, easy implementation, and phase same effect

Active Publication Date: 2013-09-04
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a wired parallel digital control method for multi-module inverters in view of the shortcomings of the existing wired parallel inverters such as complex system control and poor current sharing effect

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Embodiment Construction

[0026] The multi-module inverter wired parallel digital control method of the present invention is applied to a distributed inverter parallel system. The distributed inverter parallel system is a system composed of inverter modules connected in parallel. Such as Figure 4 As shown, the connection between the inverter modules is composed of a communication bus, a synchronous signal bus and an output-side AC bus; each inverter module is mainly composed of an inverter main circuit, a sampling circuit, a controller, and a PWM driver. . The reference voltage phase of each inverter is guaranteed to be the same through the synchronous signal bus, the effective value of the voltage on the output AC bus is guaranteed to be constant through the master feedback loop, and the slave feedback loop ensures that the power of each inverter module is shared equally. The following takes the single-phase inverter parallel system as an example to illustrate its characteristics.

[0027] The mul...

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Abstract

The invention discloses a multi-module inverter wired parallel digital control method. The method can be applicable to a single-phase inverter parallel system or a three-phase inverter parallel system. Connecting wires among the inverter modules are composed of a communication bus, a synchronizing signal bus and an output side alternating current bus, and the control part of the inverter modules mainly consists of a homogenization voltage-stabilizing loop, virtual impedance calculation and inverter voltage current double loop control. The reference voltage phases of the inverter modules are enabled to be the same through the synchronizing signal bus, a master machine guarantees the voltage effective value of the output alternating current bus to be constant, and a slave machine traces the master machine to enable the power of the inverters to be uniformly distributed. According to the multi-module inverter wired parallel digital control method, the output frequencies, the amplitudes and the phases of the modules can be enabled to be identical, the current sharing effect is good, the control method is simple and easy to implement and the reliability is high.

Description

technical field [0001] The invention relates to the application of power electronic technology in inverter power supply, in particular to a wired parallel digital control method for multi-module inverters. Background technique [0002] An inverter is a power conversion device that converts DC power into AC power, and is widely used in various fields. [0003] With the development of modern industry and the increase of electrical equipment, the requirements for the power level and reliability of the power supply are getting higher and higher. Due to the limitation of the capacity of the switch tube, the power supply of a single power supply cannot meet the occasions of high power and super power. Parallel connection of multiple inverter modules to expand the power level. A power supply system using multiple inverters can implement n+1 or n+m redundant design, which can ensure the normal operation of the system even if several inverter modules fail at the same time. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
Inventor 石健将龙江涛王文杰
Owner ZHEJIANG UNIV
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