三峡—华东HVDC辅助频率控制的动模试验

通过大规模动模试验分析了三峡一华东高压直流(HVDC)输电系统加装辅助频率控制器后的动态特性。试验结果表明，加装了辅助频率控制器的HVDC系统能在两侧交流系统发生大扰动时，实现两侧系统之间功率的相互紧急支援，可显著改善两侧交流系统频率，并能在多回直流输电线路中实现功率的平稳转移，经济效益显著。通过试验也初步揭示了HVDC辅助功率调制对交流系统稳定性以及对HVDC系统自身稳定性的影响，为设计综合性能良好的辅助控制器提供了具有较高参考价值的试验数据。

DYNAMIC SIMULATION EXPERIMENT OF AUXILIARY FREQUENCY CONTROL FOR THREE GORGES HVDC TRANSMISSION LINES

The paper introduces a large scale dynamic simulation experiment about the Three Gorges HVDC transmission lines which are endowed with the ability of auxiliary frequency control. The experiment result shows that the Three Gorges HVDC transmission lines with auxiliary frequency controllers can effectively enhance the frequency quality of both sides of AC power system when subject to large load disturbances. It also shows that with the help of auxiliary frequency controller the DC transmission power can be smoothly shifted between different HVDC lines, once one of them ceases operation in an emergency. On the other side, the paper studies the influence of HVDC auxiliary frequency control on the stability of AC power systems and the primary control modes of HVDC system. Test result shows that the sufficient reactive power supply in converters is necessary for a HVDC system with an auxiliary controller.