Prediction Algorithm for the Influence of Power Generation Adjustment on Static Voltage Stability
In order to overcome the defects of conventional off-line and on-line static stability analysis,i.e.huge computation and strict real-time demanding respectively,a novel method based on index prediction is proposed,which can be used on-line without complex calculation or real-time data.According to the fact that active power is directly proportional to phase separation of line voltages in normal operating conditions,by using initial power flow data at any time and combining flow transfer factor table,the line voltages,quick prediction can be made about key branch voltage,flow and critical operation state after a generator changes its output.An integrated stability index is formulated to characterize active margin and reactive voltage sensitivity.The estimated value is drawn on to forecast development trend of the branch voltage stability level,and then the index and generator reactive power output limits are used to determine the maximum adjustable range of active power.Finally,the weighted indicator is adopted to evaluate the voltage stability lever under different output of the generator.Simulation results of a certain power system in China verify the validity of the proposed algorithm.
integrated indexvoltage stabilityreactive power outputactive power outputon-line analysis
NETL
NSTL
万方数据
维普
