【摘要】 针对链式静止同步补偿器(STATCOM)中直流电容电压平衡的问题,提出一种混合控制策略。其将控制过程分为动态和稳态两个过程。在动态过程中,采用了一种基于直流侧电容充放电原理的控制方法,在不影响系统输出电压波形和系统运行稳定性的前提下,通过对电容进行强制的充电和放电,对电容电压进行平衡控制,并保证响应速度的快速性;在稳态时,为保证系统的稳态精度,采用轮换脉冲法。通过设定一定的条件,使两种平衡控制能根据系统实际运行状态相互切换。在单相5链节STATCOM实验平台上进行了实验验证,证明了所提控制方法的有效性和可行性。更多还原

【Abstract】 In order to balance DC capacitor voltage of cascade static synchronous compensator(STATCOM),a hybrid control strategy is proposed.It separates the control process into dynamic process and steady-state process.At the dynamic process,a control method based on the operating process of the DC capacitor is used to guarantee the system’s response speed.This method could force the capacity charging and discharging,without influencing the output voltage waveform and the system stability.At the steady-state,the traditional and classical method,’pulse rotation’ is used to guarantee the system’s accuracy.By setting some conditions,it could make sure that the two kinds of control method could interconvert according to the operating state of the system.An experimental platform of single phase 5-chain STATCOM verifies the theory analysis.更多还原