摘要
逆变器并联运行可以实现大容量和冗余供电,提高供电系统的灵活性和可靠性,无互联线的逆变器并联系统与有连线逆变器并联系统相比,有系统配置方便、并联时接线少、抗干扰能力强、冗余度高等优点,是当今电力电子学科研究的一个热点。
本文以无互联线逆变器并联技术为研究对象,首先介绍了逆变器的控制策略和并联方式,对逆变器进行建模,设计了逆变器的参数并进行仿真验证;介绍了现有的逆变器无线并联技术的原理,给出了不同条件下的均流控制方程,着重就PQ下垂控制法进行了推导,提出了一种改进的下垂控制方程,并对参数进行了设置。
对逆变器并联系统建立了MATLAB仿真模型,通过仿真验证,证明了所提出的控制方案和所设计的参数可行,系统均流控制良好,并且动态响应快,输出稳定。
Parallel operation of multi-inverters can achieve huge capability and redundancy power supply. It also improves the power supply agility and stability, parallel-inverter system with control interconnections and parallel-inverter system without control interconnections, the latter is more flexible and easier to expand, it is studied more and more nowadays.
This paper focus on the parallel inverters without control interconnections, firstly introdues the control tactics and connection in parallel method of inverter, constructs the model of inverter, and minutely introduces the disign of LC output filter, further analyse and computes the parameters; and designs the each step of voltage and electric current hexagon control inverter, and the inverter is rational with the MATLAB simulation.
The principle of power distribution was analyzed and the function to control the output power was presented. Emphasize derivative the PQ droop arithmetic, and put forward optimization droop arithmetic function, then setup the parameters.
With establishing and analyzing the simulation model of single wireless parallel inverter system by MATLAB, which tested the right of the controll scheme was put forward and the parameters was designed. The system has good effect of current share, and both dynamic and steady performances of the system are good.
引文
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