高压直流附加控制对强迫振荡的抑制作用

Mitigation effect of HVDC supplementary control on forced oscillation

强迫振荡成为电网动态稳定的主要问题之一,可能引起区域联络线有功功率大幅振荡。分析了多机系统强迫振荡的原理,设计了高压直流附加阻尼控制器,分析了不同扰动源位置、频率以及直流输送功率下高压直流附加控制器对强迫振荡的抑制效果。2区4机交直流系统的仿真结果表明,高压直流附加控制器对强迫振荡的抑制效果与扰动源位置关系不大,主要取决于扰动源频率和直流输电功率水平;当扰动源频率等于区域间振荡频率时,抑制效果最佳;直流输送功率越大,强迫振荡的抑制效果越好。

The forced oscillation is one of the main problems of power grid dynamic stability and may cause high amplitude active power oscillation in the area tie line. The principle of forced oscillation in multi-machine system is analyzed and the HVDC supplementary damping controller is designed to analyze its mitigation effect on the forced oscillation under different locations and frequencies of disturbance source and different HVDC transmission power.Simulative results of the 2-area 4-machine AC-DC hybrid system show that the mitigation effect of HVDC supplementary controller on the forced oscillation is not very relevant to the location of disturbance source,while mainly depends on the frequency of disturbance source and the transmission power level of HVDC. When the frequency of disturbance source is equal to the inter-area oscillation frequency,the mitigation effect is the best,and the higher the HVDC transmission power is,the better the mitigation effect will be.