SVC与HVDC非线性协调滑模变结构控制的研究

Research on the Variable Structure Control of the Nonlinear Coordinated Sliding Mode of SVC and HVDC

针对逆变站消耗的无功功率与电压稳定之间的矛盾,采用静止无功补偿器(SVC)对直流逆变站进行无功补偿,从而在改善系统的稳定性的同时,使逆变侧电压更具稳定性。通过建立含有直流功率调制和静止无功补偿器的系统状态方程,并运用非线性系统理论以及变结构控制理论,设计出了直流与静止无功补偿器的非线性协调控制规律。最后对系统进行仿真,其结果表明该控制规律能有效地提高系统的暂态稳定性,并能进一步改善交流系统的电压,达到良好的控制效果。

For the contradiction between reactive power consumed by inverter and voltage stabilization,adopt SVC to make reactive compensation to DC inverter,thus improving the system stability simultaneously to make the voltage at the inverter side more stability.By establishing the system state equation containing DC power modulation and static reactive compensator and applying nonlinear system theory and variable structure control theory,the nonlinear coordinated control law of DC and static reactive compensator is designed.Finally,make the system simulation,the result shows that the system control low can effectively improve transient stability of the system and further to improut AC system voltage reaching fine control effect.