A General Decentralized Control Scheme for Medium-/High-Voltage Cascaded STATCOM
A General Decentralized Control Scheme for Medium-/High-Voltage Cascaded STATCOM
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DOI：
10.1109/tpwrs.2018.2865127
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发表时间：
2018-08
影响因子：
6.6
通讯作者：
Xiaochao Hou;Yao Sun;Hua Han;Zhangjie Liu;M. Su;Benfei Wang;Xin Zhang
中科院分区：
文献类型：
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作者：
Xiaochao Hou;Yao Sun;Hua Han;Zhangjie Liu;M. Su;Benfei Wang;Xin Zhang
提出了一种适用于中高压电网的级联H桥逆变器型静止无功补偿装置的通用分散控制方案。H桥模块以分散的方式控制，没有中央控制器，每个模块基于单独的本地控制器做出决定。该局部控制器包括两部分：第一部分，引入Q-ω升压控制以平均分配无功功率;第二部分，建立可扩展的P-V控制以平衡逆变器直流侧电压。该方案能够自主地实现频率同步，具有可靠性高、可扩展性好、成本低等优点。此外，还提出了一种改进的分散控制，以适应电网侧的动态时，意外事件将发生。推导了系统稳定性条件，仿真结果验证了该方法的可行性。
This study presents a general decentralized control scheme for cascaded H-bridge inverter-based static compensators in medium-/high-voltage power network. The H-bridge modules are controlled in a decentralized manner without a central controller and each module makes decisions based on individual local controller. The local controller includes two parts: first, a Q-ω boost control is introduced to share reactive power equally; and second, a scalable P-V control is established for balancing dc-link voltage of inverters. The proposed scheme can achieve frequency synchronization autonomously, and thus has advantages of improved reliability, scalability, and decreased costs. Moreover, an improved decentralized control is also proposed to adapt the grid-side dynamics when contingencies will occur. The system stability conditions are derived, and the feasibility of the proposed method is verified by simulation results.