摘要
具有独立电源的链式H桥多电平变流器具有每个H桥单元结构相同、所用元件数少、易于实现电路的模块化设计和封装等一系列优点,成为无功补偿的发展趋势。首先介绍了静止无功发生器(SVG)的基本工作原理,然后分析了链式H桥的特点,并根据主电路的结构设计了一种混合脉宽调制策略。最后,在saber仿真环境下建立SVG模型,并进行仿真。仿真结果表明,该设计能够及时有效地进行无功补偿,且输出电压电流波形谐波含量少。
In reactive power compensation, cascaded H-bridge multilevel converter with separated dc sources seems to become a trend for many reasons.The cascaded converter is constructed with a number of identical H-bridges inverters.In addition, for the same power capability, the cascaded converter requires less number of main power components. Firstly, the basic principles of static var generation （SVG） is introduced. Secondly, it analysises the feature of cascaded H-bridge multilevel converter.On the basis of the topology, this dissertation presents a new method of mixed PWM control strategy. At last, it established the simulation model of SVG based on saber.Simulation results show that the design can compensate reactive power immediately and effectively and the harmonic of the output voltage and output current is very little：
出处
《电子设计工程》
2011年第18期137-140,共4页
Electronic Design Engineering
