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基于两端直流输电技术的多端直流输电系统已在实际工程中得到了应用,并在远距离大容量输电方面有着广阔的发展前景。交流谐波计算作为其系统设计的重要环节,为交流滤波器的设计提供重要依据。采用一种多端直流输电系统交流侧谐波电流计算的快速解耦算法,该算法以时域分段法为基础,将多端直流输电系统各站交流谐波计算相互解耦,简化直流模型的建立。根据谐波电流计算结果,提出考虑各种工况和功率组合水平下多端直流输电系统交流侧滤波器设计的基本流程和方法,借助计算机程序,快速实现反复设计和优化,最终满足滤波器性能和定值的要求。最后,以一个并联型四端直流输电系统为例进行交流侧谐波计算和滤波器的设计,计算结果显示所设计的滤波器组合满足滤波器性能和稳态额定值校核的要求。
The multi-terminal HVDC transmission system based on the two-terminal HVDC transmission technology has been applied in practical engineering and has broad prospects for development in the long-distance and large-capacity transmission. AC harmonic calculation as an important part of its system design, AC filter provides an important basis for the design. A fast decoupling algorithm for AC side harmonic current calculation of a multi-terminal HVDC transmission system is proposed. This algorithm decouples the AC harmonic calculations at each station of a HVDC system based on the time-domain method to simplify the establishment of the DC model . According to the calculation results of harmonic current, the basic flow and method of AC side filter design considering multi-terminal HVDC transmission system considering various operating conditions and power combinations are put forward. With the aid of computer program, the iterative design and optimization are realized quickly and finally the filter performance and Set value requirements. Finally, a parallel four-terminal HVDC transmission system is taken as an example to calculate the AC side harmonic and the filter design. The results show that the designed filter combination meets the requirements of filter performance and steady-state rating verification.