Research On Reliability Assessment And Storage Strategy On Power System With Large-scale Wind Power Penetration

Wind power technology is currently the world’s fastest growing and has the most economic benefits of all kinds of renewable energy generation technologies, but the randomness and Intermittent of the wind speed and will directly affect the wind farm output. This paper studied impact on the reliability of power system after a large-scale wind power penetration based on Monte Carlo simulation method, and studied the reliability of power system with combined wind power and energy storage system, the paper also presented an fuzzy control strategy of energy storage. The main contents of this paper can be summarized as follows:(1) The paper described the main concepts of power system reliability evaluation as well as the model of wind turbine. Reliability assessment method can be classified as analytical method and simulation, a basis of analytical method can be put as general state, enumeration method, while the simulation method commonly uses component sampling method, mainly using the Monte Carlo simulation method. Two simple wind speed prediction methods were introduced, namely simulation of the random number and the time series method, respectively. The power curve of the output of the wind turbine is related with wind speed conditions, as well as the unit itself, there is a nonlinear relationship between the output of the wind turbine and wind speed.(2) The paper established a fuzzy probabilistic model of the load, assessed the impact on power system reliability after large-scale wind power penetration on the basis of non-sequential Monte Carlo simulation. The uncertainty range of the average ratio of peak load is smaller than the uncertainty range of the system reliability indices of the power system before and after the large-scale wind power penetration and reliability indicators is more sensitive to the upper boundary of the uncertainty of the peak load. The improvement of system reliability level after wind power penetration is less obvious than the same capacity of conventional generators integration, a large number of wind power after the intervention, the more wind power penetration, the less the improvement of system reliability level. To get the same level of reliability improvement of system reliability level, wind power penetration should be developed based on a certain percentage of the capacity of conventional units.(3) The classification of the energy storage system and storage technologies in the power system was introduced in this paper. This paper puts forward a reliability assessment model containing a combined wind farms and energy storage system based on time-series Monte Carlo simulation. Impacts on reliability of the power system with different storage strategies were compared. Fuzzy control strategy of energy storage system and improvement of traditional strategies were presented, examples showed that the fuzzy control strategy proposed in this chapter in the case of a limited line transmission capacity can lead to better improvements of reliability level of power system compared to the original energy storage strategy, also this strategy had a better utilization of wind energy.