同塔双回直流输电工程同址换流站交流滤波器设计关键问题研究

同塔双回、换流站同址的直流输电工程具有同塔双回直流独立运行、换流站同址合建、共用交流场的特点，其灵活、多样的运行方式对滤波器设计提出更高的要求。本文按照滤波器设计的流程详细分析了同塔双回、换流站同址时影响滤波器设计的关键问题，分别针对直流运行方式、双回直流谐波电流计算、谐波阻抗分区、滤波器选型和参数选择、滤波器策略进行分析并提出相应的解决方案。算例计算结果表明，本文提出的解决方案，可以用于同塔双回、换流站同址的直流输电工程交流滤波器设计。

Study on the Key Issues of AC Filter Design for Double Line DC Transmission Project in a Common Converter Station

Double line DC transmission project in a common converter station has the following characteristics, such as, the two DC circuit operating independently, common converter station and sharing equipments in AC swtich yard. The flexible scheduling and various operation modes put forward higher requirements for AC filter design. This paper analyzed the key issues of AC filter design for double line DC transmission project according to the process of AC filter design. The reasonable operating modes, the maximal harmonic current combination picked up among different power combinations, the partitioning process of the system harmonic impedance, filter types and parameter selecting are discussed in detail. The corresponding solutions are approached. Calculation results show that the solutions can be used for AC filer design of double line DC transmission project in a common station.