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电力系统稳定器(power system stabilizer,PSS)是目前抑制电力系统低频振荡最经济、最有效的办法,PSS抑制低频振荡的效果很大程度依赖于参数好坏。传统的PSS设计方法需要测量励磁系统的无补偿滞后特性,然而,这种基于在线激励的方法可能会对系统稳定性造成危害。为此,提出了一种基于相量测量单元(phasormeasurement units,PMUs)实测扰动数据的PSS参数设计方法。首先推导了单机无穷大系统线性化模型中振荡时各物理量的相位关系,再利用多信号Prony辨识得到的相位计算励磁系统的相位滞后特性,最后采用相位补偿法设计PSS参数。该方法利用电网中自有的扰动数据,不需要施加激励信号,具有很好的工程应用价值。采用贵州电网PMU实测记录的两次扰动数据进行仿真,结果显示按照提出的方法得到的PSS参数能够进一步改善相关模式的阻尼特性,提高系统的稳定性,表明了该方法的有效性。
Power system stabilizer (PSS) is the most economical and effective way to suppress low frequency oscillation in power system at present. The effect of PSS on low frequency oscillation depends on the parameters well. Traditional PSS design methods need to measure the uncompensated hysteresis characteristics of the excitation system. However, this method based on online excitation may jeopardize system stability. Therefore, a PSS parameter design method based on measured disturbance data of phasormeasurement units (PMUs) is proposed. Firstly, the phase relationship between each physical quantity during oscillation in the single-machine infinite system linearization model is deduced. Then the phase lag characteristic of the excitation system is calculated by using the phase identification of multi-signal Prony. Finally, the phase compensation method is used to design the PSS parameters. The method uses the perturbation data in the power grid and does not need to apply the excitation signal, which has good engineering application value. The simulation results show that the PSS parameters obtained according to the proposed method can further improve the damping characteristics of the relevant modes and improve the stability of the system, which shows the effectiveness of the proposed method.