Impacts Of Integration Of Wind Farm On Power System Transient Stability

Transient stability is a stochastic problem that has attracted a wide attention in recent years.Traditionally and technically,deterministic method is applied to evaluate TS.This method is usually considered as a single accident.However,disturbance in power system is essentially and traditionally random process.The type,location and clearing time of disturbances are stochastic processes in nature.In the past few years,with the rapid development in the technology of WP generation,WTF is highly integrated into the power grid,causing people to worry about the possible impact of the overall stability of the power system.Generally speaking,stability is related to the performance of power system,when it is suddenly disturbed.The impact of stability can be large or small depending on the situation of the fault type.The stability of large disturbances is normally due to failure of the system,faults,generation loss and heavy load loss is called as transient stability.The impact and evaluation of the transient stability of traditional generators are well documented in the literature.A new generator technology is introduced as an important portion of power system components with the emergence of WT.Therefore,the influence and impact of this new technology on the stability of the whole system necessary to understand as a safe and long lasting power system.In my research work,IEEE-14 Bus Data system has been taken under consideration as a PS to do required experiment.Initially,PFA has been made by using power flow solver as NR method.After that a 3-Phase fault has been introduced on Bus No.2 to create a contingency.In this contingency three phase for about t=0.2sec duration has been introduced at t=0.5sec interval of time.Power flow analysis is then made again to see the effect of fault on power system.After successful implementation of 3-phase fault,a WF is introduced at Bus No.1.Time domain analysis has done to see its impact on the system.Then again,another WF is introduced at Bus No.14.Resulting in increasing the instability of the whole system,which in turns showing and verifying the statement that "instability increases as a large portion of SGC is replaced by WTF’s.”This large instability is then decreases by installing static capacitors along with PV Buses.After that another impact and behavior of the system can be seen by changing the location of WTF’s.To analyze this impact the location of the WTF is changed from Bus No.4 to Bus No.1,resulting in the more instability of the power system.Finally,another impact is analyzed by the changing the speed of wind turbine from 20m/s to 5m/s.It shows the results that,by decreasing the speed of the wind turbine from nominal value the instability increases more.