Voltage Stability Margin Evaluation Algorithm Based on Holomorphic Embedded and Padé Approximation Zero-pole Detection
Aiming at the problem of voltage stability margin assessment in power system,this paper proposes a fast calculation method of voltage stability margin based on holomorphic embedded method and padé approximation zero-pole detection under the framework of prediction and correction.The main steps of the algorithm proposed in this paper include prediction,correction,step length selection,padé approximation and zero and pole detection.In the step of prediction and step length selection,the variable step length holomorphic embedded method is adopted to realize voltage prediction under other operating conditions,and the appropriate step length is selected based on prediction error analysis.In the correction step,the flexible holomorphic embedded method is adopted.After the predicted voltage reaches the set error limitation,the voltage is corrected to improve the convergence property.Finally,the padé approximation of the voltage series and its zero-pole are calculated.In addition,the power series of generator reactive power can also be obtained in the prediction step,which can predict whether the generator reactive power exceeds the limits,and realize the fast conversion of bus type.Several IEEE standard examples are tested and compared with the common continuous power flow method,which shows that the proposed method is accurate and fast.
万方数据
维普
