Analysis Of The Impact Of Wind Power On Grid Voltage

As a lot of wind farms with large capacities are being integrated in transmission network, more and more impacts will be brought on Safety and stabilization, dispatching operation and many other aspects of power system in our country, It is emergent to carry out the relevant work of theoretical research and the analysis work. Aiming at the problem of analysis of security and stability of power system integrated with large capacity wind farm, this topic launched a series of research, mainly analyses the steady trend problem,static voltage stability and transient voltage stability of the power system integrated with large capacity wind farms.Trend analysis section calculated the trend under a variety of steady state in flow analysis, studied how to better configure the reactive power according to the gradually increasing of the wind power and load proportion in practice, analyses the fluctuation of node voltage as the wind power and load proportion altering. Verifies the grid in the steady-state operation safety; draw the node voltage curve as the ratio of wind power and load altering in partial running state, gave visual rAFerence to the field staff, calculated the N-1 state, Verifies the system static security.Static voltage stability analysis parts used the method of PV and QV curve to analysis the static voltage stability of the network integrated with large capacity wind farms. Draw various initial operating state node voltages with regional load node proportion and wind power changing proportion of PV curve, extends the functionality in BPA, calculate the stable limit more accurately; Compares the different initial operation condition of PV curve; finding out the stable limit with regional load and wind power proportion of contact; draw some operation condition node VQ curve, Gives part of bus-bar reactive redundancy.Transient voltage stability analysis parts analysed the transient voltage stability of the network integrated with large capacity wind farms, studied the model of the wind turbine,the model of wind power,the model of Pitch control system and the model of Wind velocity, Respectively on backbone fault,the fault of output line of the wind farm and wind farm exports to conduct the transient simulation, Verifies the grid transient voltage stability; for limit clearance time after Wind power access probes and research.