直流系统控制方式对暂态稳定性的影响

Influence of DC System Control Modes on Transient Stability

通过仿真算例研究了直流系统的控制方式对暂态稳定性的影响。结果表明,就保持暂态稳定性的能力而言,整流器定电流控制要好于定功率控制,逆变器定电压控制要好于定熄弧角控制。并对所得结论的机理做出了解释,指出由于整流器定电流、逆变器定电压控制方式在暂态过程中减少了对交流系统的无功需求,缓解了换流器交流母线电压的下降,从而有利于防止直流功率的降低,所以其保持暂态稳定性的能力要好于整流器定功率、逆变器定熄弧角控制方式。

This paper analyses the influence of DC system control modes on transient stability through simulation examples. The results show that constant current control is better than constant power control at rectifier and constant voltage control is better than constant extinction an- gle control at inverter in terms of maintaining transient stability. Then it explains the mechanism of conclusions,and points out that constant current control at rectifier and constant voltage control at inverter can reduce reactive power demand to AC systems and alleviate converter AC bus voltage to decline during transient process, and then DC active power can be availably prevented from reduction, so the control modes are more propitious to transient stability than constant power control at rectifier and constant extinction angle control at inverter.