摘要
传统的逆变器并联控制方案中各个模块相互之间存在连线。随着模块数目的增加和模块间距离的增大,各个模块之间的信号容易受到干扰。根据逆变器并联运行的原理,该文分析了几种逆变器并联的控制方案,比较了几种常见的PQ下垂法的优缺点,进一步研究了无互联线逆变器并联控制策略,介绍了一种更加适合光伏并网系统的无互联线逆变器并联控制方案,该方案考虑了并网线路电阻以及谐波的影响,提高了系统的动态响应能力。通过仿真验证了此方案的可行性。
Traditional inverter parallel control schemes which have the connection among each module.With the increase in the number of modules and the increases of the distance among modules,the signals among each module are vulnerable to suffer interference.According to the principle of parallel operation of inverters,this paper analyzs several parallel inverter control schemes,and compares advantages and disadvantages of several common PQ droop methods,Further,studys of the control technology of parallel inverters without iconnection.Besides,this paper also introduces a more suitable method for the grid-connected pv systems,this method takes into account of grid-connected line resistance and the impact of harmonics.Meanwhile,it also improves the dynamic response capability of the system.Though the simulation,which proves the feasibility of this method.
出处
《电子质量》
2011年第5期11-14,共4页
Electronics Quality
关键词
光伏并网
逆变器并联
PQ法
The grid-connected pv
Parallel inverters
P-Q method
