抽水蓄能电站变频起动装置的谐波抑制探讨

Study on harmonic suppression of pumped storage power station with static frequency converter

抽水蓄能电站一般采用静止变频装置(SFC)启动方案,但SFC工作时会在电网中产生谐波,对电网造成污染.本文阐述了国家谐波限制指标的制定及推导方法,并以浙江桐柏抽水蓄能电站工程为例,对抽水蓄能电站SFC装置的谐波限制进行分析,推导出18kV、500kV电网的谐波限值.通过对桐柏工程建立的Saber仿真模型,对其四种SFC方案:六脉低压、六脉高压、十二脉低压和十二脉高压进行仿真,并给出仿真结果:十二脉与六脉相比电压总畸变和电流总畸变都比较小,并且采用十二脉方案时,可以有效地去除5、7次谐波.

Static frequency converters are always used at pumped storage power station. But when SFC works, it generates lots of harmonics and pollutes the electric power system. In this paper the Chinese Harmonic Standard is investigated. With the example of Tongbo Pumped Storage Power Station, the harmonic of static frequency converter (SFC) is analyzed, and the standards for reference of limitations of 18 kV and 500 kV electric power systems are recommended. A model of Tongbo Pumped Storage Power Station is established by SABER simulation program. Then, a comparison of four schemes of Tongbo Project, six-pulse low voltage structure, six-pulse high voltage structure, twelve-pulse low voltage structure and twelve-pulse high voltage structure, is made through simulation. The results show that the voltage THD and current THD of twelve-pulse structure are smaller than that of six-pulse structure and that twelve-pulse structure can effectively reduce 5 or 7 times harmonics.