改进的同步电机阻尼绕组电流观测器

Improved synchronous generator damper current observer

对现有的阻尼绕组电流观测器进行了改进,观测器算法采用龙格-库塔4法(R-K4),相对于现有的一阶向前差分电流观测器而言,精度更高。对观测器的初值和绝对稳定域问题进行了讨论,给出了观测器的初值和投入时间不影响跟踪效果的条件。对IEEE次同步谐振第一标准模型中的阻尼绕组电流进行观测,验证了改进后的阻尼绕组电流观测器的有效性。并对阻尼绕组电流成分进行分析,分析了用其监测次同步振荡的可能性。

Improved measures are taken on existing damping current observer. Runge-Kutta （R-K4） is adopted to the improved observer which has higher accuracy, comparing with the old observer which adopted one-order forward difference. Initial value and absolute stability region of the observer are discussed and the condition when the initial value and the time observer taken into operation have no influence on result is given. By observing damper current of synchronous generator in IEEE first bench case for SSR, validity of improved damper current observer is testified. Damper current components are analyzed and using damper current to monitor SSO is proposed.