SMES抑制风电并网功率振荡的导纳控制法

Admittance Control Method for SMES Suppression of Wind Power Grid Connected Power Oscillation

为了有效抑制风电并网系统中的低频振荡,实现对电网功率的快速跟踪补偿。首先分析了含有超导磁储能系统(SMES)的单机电力系统的功角特性,从系统的能量函数入手,以SMES接入点电压及其变化率作为控制手段,快速提高整个系统的阻尼,抑制系统的低频振荡。区别于其他以接入点电压幅值和相角作为控制变量的策略,导纳控制策略引入了电压变化速度这一变量,从而提高SMES补偿电网时的速度与精度。最后,通过仿真分析验证了SMES抑制风电并网所引起的系统低频振荡的效果,结果表明导纳控制策略可有效抑制低频振荡,使系统及时恢复稳定,提高系统运行的稳定性。

In order to effectively suppress the low frequency oscillation in wind power grid connected system and to achieve fast tracking compensation of the power grid.The power angle characteristics of single machine power system with superconducting magnetic energy storage system （SMES） are analyzed, starting from the energy function of the system, using SMES access point vohage and its change rate as control means, the damping of the whole system can be rapidly increased to suppress the low frequency oscillation of the system.Different from the other to the access point voltage amplitude and phase angle as control variable strategy, admittance control strategy is introduced voltage change rate as a new variable,so as to improve the speed and accuracy of SMES compensation.Finally,the simula- tion results verify the effect of SMES on the low frequency oscillation caused by wind power grid connection.The re- suits show that the admittance control strategy can effectively suppress the low frequency oscillation, restore the sys- tem in time so as to improve the stability of system operation.