Research On Emergency Control Strategy For Security And Stability Of Large-scale Wind Power Grid System

On energy and environment of the double pressure, wind power as a clean renewable energy source in the scope of world attention. But because the height of the wind and volatility randomness, large scale wind power system for grid will have a great effect on. sometimes need through the emergency control strategy to restore and stable operation of the grid.This paper based on DIgSILENT/PowerFactory simulation software to emergency control strategy as the research object, the study analyzed the wind power on power system emergency control strategy influence. First of all, in the grid urumqi-changji, on the basis of the research of grid side happen after disturbance voltage system frequency response, comparing the wind power grid to the influence of the emergency control strategy. Second, the research and analysis of wind power into southern xinjiang part of the grid the weak link, through the corresponding emergency control strategy, make the safe and stable operation of the grid system: Finally, the system of power generation capacity to reduce way to adapt to the wind power injection size, analyzes the wind power system voltage frequency power injection of stability and the influence of the emergency control strategy.This paper by the results of the study, it is known that the first, in the power grid side have disruptions at, different types of the wind generator frequency response is different, when frequency change, constant speed fan to frequency can provide support role, and doubly-fed fan the decoupling control of frequency changes the little influence; But from the Angle of voltage change it. doubly-fed induction motor through to the active and the decoupling control of reactive power, improving the power grid voltage stability. When there is a major power grid disturbance, take the same in the premise of emergency control strategy, whether doubly-fed induction motor or asynchronous motor, can increase the voltage and frequency variation of maximum, make take the strategy of the effect is not access when the effect of wind power take the strategy. At the same time, wind power access will shorten bus voltage and frequency to the biggest changes in the value of time. Second, southern xinjiang grid rack is weak, with south xinjiang, aksu hotan area power load increase, and system vulnerable to attack Angle instability, the voltage stability and frequency instability. Through the take cut load, solution of the listed power grid way, can make the safe and stable operation of the grid; Third, the wind power injection increases, constant speed wind generator parallel operation of frequency offset low power injection is along with the increases, and doubly-fed induction motor is on the contrary, it is the lowest frequency deviation with power injection increase and decrease gradually. Take the same emergency control strategy in the premise, frequency deviation with maximum wind power injection power increased.