Power Flow Algorithms for Multi-Terminal VSC-HVDC With Droop Control
Power Flow Algorithms for Multi-Terminal VSC-HVDC With Droop Control
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DOI：
10.1109/tpwrs.2013.2294198
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发表时间：
2014-01
影响因子：
6.6
通讯作者：
Wenyuan Wang;M. Barnes
中科院分区：
文献类型：
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作者：
Wenyuan Wang;M. Barnes
针对采用多端电压源型换流器(VSC)的高压直流输电系统，提出了复杂的、非线性的电力系统潮流控制器问题。因此，在交直流混合电网的潮流分析中，可以仔细考虑更符合实际的直流电网控制策略。针对不同类型的直流电压控制技术，对多端VSC-HVDC系统的潮流方法进行了分析，指出了现有方法的不足。针对实际直流电网可能采用分布式电压控制的情况，提出了一种新的广义算法来求解具有各种非线性电压跌落的潮流问题，并提出了将该算法与交流潮流模型相结合的方法。在实现了五组电压特性的情况下，将该方案应用于五端测试系统，取得了令人满意的效果。在风电功率变化和变流器停运的情况下，考察了系统在五种控制情景下的事故后行为。评估了这些控制措施对潮流解决方案的影响。
This paper addresses the problem posed by complex, nonlinear controllers for power system load flows employing multi-terminal voltage source converter (VSC) HVDC systems. More realistic dc grid control strategies can thus be carefully considered in power flow analysis of ac/dc grids. Power flow methods for multi-terminal VSC-HVDC (MTDC) systems are analyzed for different types of dc voltage control techniques and the weaknesses of present methods are addressed. As distributed voltage control is likely to be adopted by practical dc grids, a new generalized algorithm is proposed to solve the power flow problems with various nonlinear voltage droops, and the method to incorporate this algorithm with ac power flow models is also developed. With five sets of voltage characteristics implemented, the proposed scheme is applied to a five-terminal test system and shows satisfactory performance. For a range of wind power variations and converter outages, post-contingency behaviors of the system under the five control scenarios are examined. The impact of these controls on the power flow solutions is assessed.