加速功率型电力系统稳定器的研制

DEVELOPMENT OF POWER SYSTEM STABILIZER BASED ON PSS2A MODEL OF IEEE

目前国内生产的电力系统稳定器(PSS)多数采用单一电功率作为输入信号.由于机械功率不易获得,假定机械功率恒定时电功率就等于加速功率,而调整机械功率时,不宜再用电功率代替加速功率.因此0.1～2.0Hz频率范围内的低频振荡采用正阻尼参数后'反调'问题常常变得更严重,为解决'反调'问题,文章参考IEEE的PSS2A模型,开发了一种新型PSS,该PSS采用转速信号与电功率信号合成的加速功率作为输入信号,在解决'反调'问题的同时并不影响阻尼效果.动模试验结果及在内蒙古自治区达拉特火电厂的运行试验结果表明该加速功率型PSS具有良好的阻尼效果及抑制'反调'的功能.

At present in most of domestic PSSs the single electrical power is used as their input signal, when the positive damping parameters are provided for the low frequency oscillation within 0.1 to 0.2Hz, the antiregulation phenomenon may become severe for these PSSs, and the reason is that the mechanical power is difficult to be measured. Assuming the mechanical power is steady, at this time the electrical power is equal to the accelerating power; when the mechanical power is adjusted, it is not appropriate to use the electrical power as the accelerating power. To solve this problem, according to the PSS2A model of IEEE, a new type of PSS is developed in which the accelerating power which composes revolution speed signal with electrical power signal is used as the input signal, therefore, the damping effect can be ensured while the antiregulation problem is solved. The results of dynamic simulation and that of the running tests in Dalate power plant in Inner Mongolia Autonomous Region show that the developed PSS possesses good damping effect and can effectively restrain the antiregulation phenomenon.