交直流电力系统PSS和直流附加控制的协调

Coordination of PSS and DC additional controller for AC/DC power system

针对当今大容量、远距离、多区域互联电网低频振荡现象严重的问题,提出了一种基于Prony算法的PSS和直流附加控制器协调运行的策略。该方法根据多代理分层控制的思想,首先利用Prony辨识全网系统,求出在没有配置PSS和直流附加控制时的系统振荡频率,利用相位补偿法优化PSS控制参数,有效地抑制局部振荡模式。当全网的局部振荡模式达到满意水平后,反复利用Prony对系统进行辨识,通过每次的辨识结果对直流附加控制器进行参数整定,逐渐把剩余区域间振荡模式消除。仿真研究表明,该控制策略有效抑制了贵广交直流系统的低频振荡,并具有一定的鲁棒性。

To avoid the serious low frequency oscillation of high-capacity long-distance multi-reglonal power network,a strategy is proposed to coordinate PSS and DC additional controller,which uses Prony algorithm to identify the whole network system according to the concept of multi-agent hierarchical control,calculates the oscillation frequency of system without PSS and DC additional controller,and then applies the phase compensation method to optimize the control parameters of PSS for effective restraint of local oscillation mode. When the satisfactory global oscillation mode is reached, the parameters of DC additional controller are set by the repeated system identification with Prony algorithm to gradually remove the remainder inter -regional oscillation modes. Simulation for an AC/DC power system shows its effectiveness and robustness.