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静止同步补偿器(static synchronous compensator,STATCOM)具有对无功功率进行独立快速控制和提高电压稳定性的特点。将STATCOM接入双馈入直流系统某一逆变站交流母线,建立含STATCOM的双馈入直流系统模型,推导了整个系统稳态功率传输的数学模型。通过理论分析和PSCAD/EMTDC仿真,详细研究短路比、直流落点间的电气距离等因素对双馈入直流系统运行指标的影响。并提出利用最大传输有功功率增加量来分析STATCOM对不同短路比时最大传输有功功率的影响。研究表明:STATCOM的接入可以等效的增大直流子系统所馈入交流系统的强度,增大直流子系统的稳定运行区域,改善其换相失败免疫能力,抑制暂态过电压,从而有效改善双馈入直流系统的稳态和暂态运行特性。
Static synchronous compensator (STATCOM) has the characteristics of fast and independent reactive power control and improve the voltage stability. The STATCOM is connected to the AC bus of a converter station of doubly-fed DC system, and a doubly-fed DC system model with STATCOM is established. The mathematical model of steady-state power transmission of the whole system is deduced. Through the theoretical analysis and PSCAD / EMTDC simulation, the effects of short-circuit ratio and the electrical distance between DC drop points on the operation indexes of doubly-fed DC system are studied in detail. It is also proposed to analyze the influence of STATCOM on the maximum transmission active power with different short-circuit ratios by using the maximum transmission active power increase. The results show that STATCOM access can effectively increase the strength of the AC system fed by the DC subsystem, increase the stable operation area of the DC subsystem, improve the immunity of commutation failure, and suppress the transient overvoltage so as to be effective Improve Steady-State and Transient Operating Characteristics of Doubly-Fed DC Systems.