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±800 kV特高压直流系统采用双12脉动换流器串联的接线方式,为研究对其实施有效控制的方法,采用EMTDC仿真分析了双串联换流器的基本控制原理、投切单一换流器和其它各种故障后换流器的控制特性。结果表明,双换流器串联的直流系统仍可采用整流侧换流器控制直流电流,逆变侧换流器控制直流电压的基本运行控制策略。当对换流器独立控制时,加入误差消除环节能有效控制发散现象,保证特高压直流系统的稳定运行和各种故障下的运行性能。
The ± 800 kV UHVDC system adopts double 12-pulse converter in series connection mode. In order to study the effective control method, the basic control principle of double-series converter is analyzed by EMTDC simulation. And after a variety of other fault converter control features. The results show that the DC system with dual converters can still use the rectifier side converter to control the DC current and the inverter side converter to control the basic operation control strategy of DC voltage. When the inverter is controlled independently, adding the error elimination loop can effectively control the divergence and ensure the stable operation of the UHV DC system and the operation performance under various faults.