摘要
与传统两电平静止同步补偿器相比,多电平静止同步补偿器由于具有电压等级和装置容量高、输出波形质量好等优点在高压大功率场合得到了广泛的应用。本文首先对三电平STATCOM(静止同步补偿器)的工作原理和运行特性进行了阐述,接着针对阻感负载提出了一种基于序分解的三电平STATCOM不平衡控制策略,并在电网电压不平衡以及负载不对称的情况下对该控制策略进行了仿真。最后仿真验证了该控制策略的可行性和良好的控制效果。
Compared with the conventional two-level STATCOM, multilevel STATCOM can provide higher power and voltage levels and improved output waveforms. As a result, multilevel STATCOM has been widely used in high-voltage and high-power situation. Operating characteristics and working principles of the three-level STATCOM are de- scribed and analysed at the beginning. Besides, a control strategy based on sequence decompostion for resistive and inductive loads is presented under unbalanced voltage system. Finally, performance of the proposed strategy is evaluated based on simulation studies in unbalanced voltage and asymmetric load situation, which demonstrates that the proposed control strategy based on sequence decompostion can achieve excellent compensation effect.
出处
《变频器世界》
2011年第3期107-110,共4页
The World of Inverters
