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首页> 外文期刊>Electric power systems research >Optimal Shunt Busbar Capacitor Placement for Selective Protection of Large-Scale VSC-MTDC Grids
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Optimal Shunt Busbar Capacitor Placement for Selective Protection of Large-Scale VSC-MTDC Grids

机译：大型VSC-MTDC网格选择性保护的最佳分流母线电容器放置

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摘要

This paper studies optimal shunt busbar capacitor placement for large-scale VSC-MTDC grids to accurately discriminate between faults inside each protection zone and external faults. The installed capacitors work as filters, which attenuate higher frequencies for faults outside the zone and keep internal fault transients unchanged. The objective function is a trade-off between total installation and maintenance cost and the discrimination sufficiency, while constraints related to the grid operation must be satisfied. Discrete wavelet transform (DWT) is used to calculate wavelet energies and to define relay detection criteria. The proposed method is applied to CIGRE large-scale VSC-MTDC grid in PSCAD/EMTDC. MATLAB is used for DWT-based signal processing with Python used as an interface between PSCAD and MATLAB for optimization based on the Watercycle optimization algorithm (WCA). Multiple faults with different characteristics are simulated to test the optimal results in different situations. The optimal results show that the proposed principle accurately discriminates between internal and external faults. Simulation results prove accurate detection of the faulty section using both two-sided measurement and one-sided measurement with half of measuring and protection equipment. The sensitivity of the method to faults close to the measuring points and the impact of different DWT levels is analysed.
机译：本文研究了大型VSC-MTDC网格的最佳分流母线电容器放置，以精确区分每个保护区内的故障和外部故障。已安装的电容器作为过滤器，其衰减区域外的故障频率，并保持内部故障瞬态不变。目标函数是总安装和维护成本和歧视充足之间的权衡，但必须满足与网格操作相关的限制。离散小波变换（DWT）用于计算小波能量并定义继电器检测标准。所提出的方法应用于PSCAD / EMTDC中的CIGRE大规模VSC-MTDC网格。 MATLAB用于基于DWT的信号处理，用Python作为PSCAD和MATLAB之间的接口，基于水循环优化算法（WCA）优化。模拟具有不同特性的多个故障以测试不同情况下的最佳结果。最佳结果表明，所提出的原则准确地辨别内部和外部故障。仿真结果证明了使用双面测量和一半测量和保护设备的单面测量来精确检测故障部分。分析了方法对靠近测量点的故障的敏感性以及不同DWT水平的影响。

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