高压直流输电系统谐波计算软件包开发与应用

Development and Application of Harmonic Calculation Software for HVDC System

为提高直流输电系统谐波计算的准确性,采用交直流基波和谐波统一计算的原理,应用VC++和Delphi语言开发了直流输电系统谐波计算软件,可同时计算含有多个直流输电系统换流站、直流线路及交流系统各母线和各支路的基波潮流、特征谐波和非特征谐波电压、电流,计算各母线谐波电压畸变率及系统谐波损耗;同时,根据直流输电线路、接地线等结构参数,计算直流输电线路的谐波参数;并提供了数据的各种输入、编辑和维护、查询功能,可方便地调整交、直流滤波器的类型和参数。利用该软计对南方电网含有5条直流线路的系统进行了计算,程序运行稳定,结果可靠;并将±800kV云广直流输电系统的计算结果与EMTDC仿真结果进行了比较,表明该软件具有计算速度快、结果准确、使用方便、通用性好等特点。

To calculate harmonics of a HVDC system, a new software, which is based on the unified fundamental and harmonic frequency load flow algorithm, is developed by VC＋＋ and Delphi. With this software, several important issues of a HvDc system, such as characteristic and non-characteristic harmonics of the 12-pulse converters, the fundamental frequency load flow and harmonic load flow of DC transmission line and AC system, and the system harmonic distortion factor and harmonic loss, can be analyzed simultaneously. Furthermore, it can also calculate the harmonic parameter of DC transmission line according to the structural parameter of DC transmission line and overhead ground wires. In this software, various functions are also provided for data input, edit, maintenance and query. By these functions, type and parameter of AC/DC filter can be adjusted expediently. This software is used on Chinese southern grid. The calculation result of Yunnan-Guangdong ± 800 kV HVDC system is compared with EMTDC simulation result. The results show that the proposed software is more efficient, accurate and convenient.