Mitigation of unbalanced voltage dips using static series compensator
Mitigation of unbalanced voltage dips using static series compensator
复制标题
DOI：
10.1109/tpel.2004.826536
复制
发表时间：
2004-05
影响因子：
6.7
通讯作者：
H. Awad;J. Svensson;M. Bollen
中科院分区：
文献类型：
--
作者：
H. Awad;J. Svensson;M. Bollen
静止串联补偿器(SSC)适用于保护敏感负载免受电压骤降的影响。由于电力系统的故障多为单相或双相故障，因此对于不平衡暂降，需要对SSC的控制算法进行调整。为了改善SSC的动态性能，本文提出了两种控制策略。第一种策略使用一种快速技术来分离电源电压的正序和负序分量，然后分别对其进行控制。因此，为这两个序列实现了两个控制器，每个控制器都基于矢量控制。第二种策略是基于只使用一个正序控制器和提高开关频率。因此，由于倾角不平衡而产生的负序列被转换为正序列中的变化。随着开关频率的增加，控制器跟踪这些变化的能力也会提高。通过PSCAD/EMTDC仿真和在10kVSSC上进行的不平衡电压暂降实验测量，验证了所提策略的有效性。
The static series compensator (SSC) is suited to protect sensitive loads against voltage dips. Because most of the power system faults are single- or double-phase, the control algorithms of the SSC should be adapted for unbalanced dips. This paper proposes two control strategies to improve the dynamic performance of the SSC. The first strategy uses a fast technique for separating positive and negative sequence components of the supply voltage, which are then controlled separately. Thus, two controllers are implemented for the two sequences, each based on vector control. The second strategy is based on using only a positive sequence controller and increasing the switching frequency. Consequently, the negative sequence due to the unbalanced dip is transformed into variations in the positive sequence. As the switching frequency increases, the ability of the controller to follow those variations improves. The validity of the proposed strategies is demonstrated through PSCAD/EMTDC simulation and experimental measurements carried out on a 10-kV SSC, when the grid is subjected to unbalanced voltage dips.