电力系统稳定器对电力系统动态稳定的作用及与其他控制方式的比较

THE EFFECT OF POWER SYSTEM STABILIZER (PSS) ON POWERSYSTEM DYNAMIC STABILITY AND COMPARISON WITH OTHER CONTROL METHOD

给出了电力系统稳定器（ＰＳＳ）在提高电力系统动态稳定作用的仿真研究结果。结果表明，对于单机无穷大母线系统ＰＳＳ可以把动态稳定极限提高到线路极限，对快速励磁系统是如此，对常规励磁系统（Ｔｅ＝０．５ｓ）也是如此。对多区互联复杂电力系统，ＰＳＳ也可以把负阻功率振荡改善为强阻尼功率振荡（阻尼比大于０．１）。文中还给出ＰＩＤ＋ＰＳＳ励磁控制方式和最优励磁控制方式在设计指导思想、控制信号选择、参数选择、适用励磁系统、实际应用中的考虑等方面的比较。文章最后给出了在用作研究非线性Ｈ∞励磁控制和非线性鲁棒控制的两机系统上应用ＰＩＤ＋ＰＳＳ控制方式的仿真结果。结果表明，ＰＩＤ＋ＰＳＳ的控制方式有更好的鲁棒性。

This paper presents the simulation results of the effect of PSS on power system dynamic stability. These results show that for one machine to infinite bus system the dynamic stability of transmission line can be raised to the line transfer limit by PSS, no matter how the machine is equipped with static or conventional excitation system. In interconnected power system the negative damping oscillation can be changed into strong damping one by use of PSS. The comparison result of PID+PSS control with optimal excitation control (OEC) in the respects of principle of design, parameter selection, selection of control signal, the consideration of practical application and in which excitation systems the above mentioned control can be equipped is given. Finally, the simulation results of two machine system with different control are described. It shows that PID+PSS control is of better robustness.