Transient Voltage Stability Analysis and Control Strategies of UHV Access Zhejiang Grid

After UHV AC and DC lines connecting to power grid,the study on the voltage stability is very important for the safe and stable operation of power grid.Based on the planning data of Zhejiang grid,BPA was used as analysis software to calculate the power flow distribution of Zhejiang Grid.The transient stability after a fault of Zhejiang ultra high voltage transmission lines was simulated.Combining with the analysis tool of stability curve,the effects of the UHV AC and DC line fault on the transient voltage stability of Zhejiang grid were analyzed.Aiming at the grid′s instabilities,control strategies of the transient voltage stability were proposed.