基于齿脉冲计算转速的加速功率型PSS控制方法

Control Method of Accelerated Power PSS based on Tooth Pulse Speed Calculation

电力系统稳定器(power system stabilizer, PSS)已成为目前提高系统稳定性、抑制低频振荡最为经济、有效的技术手段。针对目前采用电气量计算转速方法用于加速功率型PSS的控制效果受电抗参数、系统工况等因素影响的问题,本文提出了基于齿脉冲计算转速的加速功率型PSS控制方法。利用光/电传感器将发电机转速转化成齿脉冲信号送至励磁设备,通过采集固定周期内整数个齿脉冲个数以及对应的高频脉冲个数计算实时转速。该方法已在实际励磁设备中实现应用,本文通过硬件在环仿真试验验证了方法的有效性和优越性,结果表明,在机组不同运行工况、不同扰动类型下,该方法均可真实地反映实际机组转速信息,有效提升了加速功率型PSS抑制功率振荡的效果,提高了PSS全运行工况下的适应性。

The power system stabilizer(PSS)has become the most economical and effective technical means to improve system stability and suppress low frequency oscillation.In view of the problem that the control effect of the accelerated power PSS using the electric quantity to calculate speed is affected by factors such as reactance parameters and system operating conditions,an accelerated power PSS control method based on tooth pulse speed calculation is proposed in this paper.The generator speed is converted into tooth pulse signal and sent to the excitation equipment by photo/electric sensor,and the real-time speed is calculated by collecting the number of integer tooth pulses and the corresponding number of high-frequency pulses in a fixed period.This method has been applied in actual excitation equipment,and its effectiveness and superiority are verified by hardware-in-the-loop simulation test in this paper.The results show that under different operating conditions and different disturbance types of the unit,this method can truly reflect the speed information of the actual unit,effectively improve the effect of the accelerated power PSS to suppress the power oscillation of the system,and improve the adaptability of the PSS under all operating conditions.