运用细菌群体趋药性优化的电力系统广域阻尼控制

Wide area damping control of power systems using bacterial colony chemotaxis

分析了广域阻尼控制器(WADC)的超前-滞后环节补偿广域测量信号大时滞的效果。介绍了确定WADC参数的方法。根据时滞引起的广域信号滞后角的大小选择超前或滞后补偿,并确定时间常数。介绍了细菌群体趋药性(BCC)优化算法及其应用,并采用BCC优化算法获得WADC的增益以改善电力系统阻尼。优化过程中采用时间加权误差平方的积分(ITSE)作为性能指标。4机2区域测试系统大扰动仿真结果表明,这种WADC在运行点大范围变化的情况下可以抑制互联电网中出现的低频振荡,有效改善电力系统稳定性。

The effectiveness of lead-lag compensation of a wide area damping controller（WADC）for offsetting the long time delay of wide area signals is analyzed.A method for determining the parameters of WADC is presented.T he lead or lag compensation and time constants are selected according to the lag-angle of wide area signal caused by time delay.Algorithm and application of the optimization with bacterial colony chemotaxis（BCC） are introduced and the gain of WADC is obtained using BCC for improving power system damping.An integral of the time-weighted squared error（ITSE） is used as performance index.The simulation results of a four-machine two-area system with large disturbance show that WADC can damp the low frequency oscillations and improve power system stability for multiple time delays with a wide operating range.