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建立了基于伊冯/呼辽交直流系统的电磁暂态模型,采用基于时域仿真实现的复转矩系数法——测试信号法,对机组施加了一系列不同频率的测试信号。计算了不同连接方式下机组在次同步频率范围内的电气阻尼特性,并考察了可控串联补偿装置对该阻尼特性的影响。最后结合时域仿真法验证了测试信号法分析结果的有效性。理论分析和仿真结果表明,在交直流系统中采用联网运行带可控串补的方式,有利于抑制高压直流输电系统和交流输电线路中串补装置引起的次同步振荡问题。
The electromagnetic transient model based on Ivan / Huron AC / DC system is established. A series of test signals with different frequencies are applied to the generating unit by complex torque method - test signal method based on time domain simulation. The electrical damping characteristics of the unit in the sub-synchronous frequency range under different connection modes are calculated, and the influence of the controllable series compensation device on the damping characteristics is investigated. Finally, combined with the time domain simulation method to verify the validity of the test signal analysis results. The theoretical analysis and simulation results show that the method of networked operation with controllable series compensation is adopted in AC / DC system, which is helpful to suppress the subsynchronous oscillation caused by series compensation in HVDC transmission system and AC transmission line.