Studies on Voltage Fluctuation in the Integration of Wind Power Plants Using Probabilistic Load Flow

A new method for analyzing voltage fluctuation in the integration of wind power plants using probabilistic load flow is presented in this paper. This method takes many probabilistic factors into consideration such as the generation output variations of wind power plants, load fluctuations, generator outages and branch outages, and then by probabilistic load flow calculation, not only the probabilistic distributions of nodal voltages are obtained, but also voltage fluctuations can be demonstrated. Moreover, the proposed method may help the optimization of reactive power compensation at wind power plants. In addition, a three-parameter Weibull distribution model that takes the location parameter into account is proposed to describe wind speed random fluctuation. Compared with the two-parameter Weibull distribution model, the impact of high speed wind on the power output of the wind turbine is considered by the presented model. Therefore, more satisfactory results can be obtained in the evaluation. The computation results of the IEEE RTS-24 test system with a wind power plant not only show the effectiveness of this method but also indicate that it can provide instructions on reactive power compensation, the location of a wind power plant, generation scheduling and dispatching. As a result, it is a useful tool for electrical engineers to study the voltage quality of the grid and choose a suitable integration location for a wind farm.