A triple-objective optimal design method for AC filters in high voltage direct current (HVDC) system based on an improved multi-objective evolutionary algorithm based on decomposition (MOEA/D) is proposed. A triple-objective optimisation mathematical model including total harmonic distortion (THD) on AC side voltage, investment cost of AC filters and telephone harmonic form factor (THFF) is established. An improved MOEA/D is proposed to realise the triple-objective optimal design for AC filters more efficiently. The improved MOEA/D adds a particular mutation operator, which can not only to prevent MOEA/D from getting stuck at local optimum but also accelerate the convergence to the optimum solution while the algorithm approaches the neighbourhood of the optimum solution. A three-dimensional fuzzy evaluation system is designed to select the optimum solution of the triple-objective optimisation. A case of ±500 kV HVDC system is simulated. Taking the ±500 kV HVDC system as the prototype system, a dynamic simulation experimental platform of the rectification system of the direct current transmission system with AC filters is designed and established based on the similarity principle. Both the simulation and experimental results verify that the proposed method have excellent performance.

中文翻译：

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基于分解的改进多目标进化算法的高压直流系统交流滤波器多目标优化设计

提出一种基于改进的分解多目标进化算法(MOEA/D)的高压直流(HVDC)系统交流滤波器三目标优化设计方法。建立了交流侧电压总谐波失真(THD)、交流滤波器投资成本和电话谐波波形因数(THFF)三目标优化数学模型。提出了一种改进的MOEA/D，以更有效地实现交流滤波器的三目标优化设计。改进的MOEA/D增加了特定的变异算子，不仅可以防止MOEA/D陷入局部最优，而且可以在算法逼近最优解邻域的同时加速收敛到最优解。设计三维模糊评价系统来选择三目标优化的最优解。模拟了±500 kV HVDC 系统的情况。以±500 kV直流输电系统为原型系统，基于相似原理，设计建立了带交流滤波器的直流输电系统整流系统动态仿真实验平台。仿真和实验结果均验证了该方法具有优异的性能。