一种改进的混合静止同步补偿器

作者设计了一种改进混合静止同步补偿器,该补偿器由一个三相电压源型逆变器和补偿电容组成,通过控制三相逆变器输出电压相对于系统电压的相位差间接控制补偿器的输出无功功率。该补偿器能进行补偿功率双向连续调节,控制简单,动态响应速度快,输出电流不含低次谐波,特别是在补偿感性无功功率时,该补偿器直流侧电容电压低,可减小开关器件的应力,降低补偿器损耗,提高装置的运行效率。在理想情况下,上述逆变器容量仅为最大补偿容性无功功率的1/4。文中分析了补偿器的工作原理,推导了补偿器和逆变器的功率公式,并分析了二者的关系。最后通过实验验证了该补偿器的可行性和有效性。

An Improved Hybrid Static Synchronous Compensator

An improved hybrid static synchronous compensator(STATCOM),which consists of three phase voltage source type of inverter connected with a compensating capacitor,is proposed,by means of controlling the phase difference between output voltage of three phase inverter and system voltage the output reactive power is indirectly controlled.With the proposed compensator the bi-directional continuous control of compensating power can be implemented.The advantages of the proposed compensator are as following:simple structure,fast dynamic response speed,easy to control,output current free of low order harmonics,etc.Especially when inductive reactive power is to be compensated,low voltage of capacitor at DC side of the compensator can decrease the stress of switching devices,reduce power loss of compensator and improve the efficiency of the compensator.Under ideal condition the capacity of the compensator is only one fourth of maximum compensated capacitive reactive power.The working principle of the compensator is analyzed in detail and the equations for the power of compensator and inverter are deduced respectively,and the relation between them is analyzed.The feasibility and effectiveness of the proposed compensator are verified by experiments.