一种改进的低压微电网逆变器控制技术的研究

Improved low voltage micro-grid control technology of inverter parallel study

通过对传统的微电网逆变器中的有功-频率、无功-电压下垂控制的分析,发现这些方法都存在有功功率和无功功率耦合的问题,当线路是阻性传输线路时这种功率耦合问题不存在,但是当这些方法用于低压微电网时,由于线路是感性的,此时这种功率耦合问题就存在,所以这些逆变器控制方法对于低压微电网是不实用的。通过一个坐标转换对有功功率和无功功率进行解耦,提出一种改进的频率-电压结构的控制,通过这种控制来实现对有功功率和无功功率的彻底解耦。仿真分析结果表明,此方法弥补了传统并联逆变器控制的不足,并且满足控制的要求,是一种相对完善的控制方案。

Through the analysis of active power-frequency and reactive power- voltage, of parallel inverter on the traditional droop control, active power and reactive power coupling problem of these methods were found. Power coupling problem was gone when the line was resistived transmission line. But when these methods for low voltage micro-grid, due to line Was perceptual, at this time the power coupling problems were existed. So the inverter control method for this low voltage micro-grid was not practical. Through a coordinate transformation of active power and reactive power decoupUng, an improved frequency -voltage control structure was proposed. Active power and reactive power were completely decoupled through the control. Finally, through the simulation analysis, the results show that, the shortcoming of the traditional parallel inverter control method are overcome and the requirements of control are met, and it is a relatively perfect control scheme.