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将超导磁储能(SMES)线圈引入基于电压源型逆变器(VSI)的静止同步补偿器(STATCOM)来阻尼电力系统低频振荡。超导磁储能线圈经过两象限三相直流-直流斩波器接入STATCOM前端的VSI。在附加储能装置——超导线圈的作用下,STATCOM能同时吸收或发出有功和无功功率,其动态性能得到很大的改善。在本文中,用电磁暂态仿真软件PSCAD/EMTDC对发生三相故障后电力系统的动态过程进行研究,并给出结果。结果表明,具有有功和无功功率控制能力的STATCOM—SMES组合补偿装置能有效地阻尼电力系统低频振荡,提高电力系统静态和动态稳定性,增强输电网的可靠性。
The introduction of a superconducting magnetic energy storage (SMES) coil into a STATCOM based on a voltage source inverter (VSI) dampens power system low frequency oscillations. The superconducting magnetic energy storage coil is connected to the VSI of the front end of the STATCOM through a two-quadrant three-phase DC-DC chopper. With the addition of an energy storage device, superconducting coil, STATCOM can absorb or emit both active and reactive power at the same time and its dynamic performance is greatly improved. In this paper, we use the electromagnetic transient simulation software PSCAD / EMTDC to study the dynamic process of the power system after the occurrence of three-phase fault and give the result. The results show that the STATCOM-SMES combined compensation device with active and reactive power control ability can effectively dampen the low frequency oscillation of power system, improve the static and dynamic stability of power system and enhance the reliability of power transmission network.