Large Wind Farms And Network Technology Research

Today, with the problems of energy shortage and environmental pollution all over the world, wind energy, one of the most important alternative energy, draws more and more attention, and with wind power generation receiving more and more attention from many countries, wind power generation industry in China is also in rapid development, gradually becoming one of the world's main markets after Europe, America. It is a general trend to actively develop wind power generation, which is energy-saving and environment-friendly for Shandong Province, one of the areas of the most abundant wind energy resources. The grid-connected wind power capacity is continuously increasing in Shandong power grid. At present, the installed wind power capacity has reached 965.4MW (2.09% of the centralized dispatching total installed capacity), and it is predicted to reach 4000MW in the year 2020. The rapid expansion of grid-connected wind power brings great pressure to Shandong power grid's stable operation.Because of the uncontrollability and unpredictability of the wind, grid-connected wind farms could bring great instability to the power system. In order to deeply research wind farms'impact to the stable operation of Shandong power grid, this paper analyzes network loss of power grid, power flow, network voltage stability, transient stability and the impact to relay protection setting, by summarizing all the simulation models and combining with the recent actual plan of Shandong power grid. This paper also summarizes some adaptive strategies for stable operation of Shandong power grid with wind farms connected.In this paper, Chapter One introduces the background and the development status of the wind power generation at home including Shandong power grid and abroad, describes two main technical types of wind power generation and relative concepts, and presents the influencing factors of large-scale wind power connecting to the grid and the problem of analyzing the impact on the grid. Chapter Two describes relative concepts and principles of wind power generation system, reactive power compensation device and voltage and reactive power regulation device. Chapter Three builds and analyzes several wind farm models, obtains wind farm's impact on system voltage fluctuation and reactive compensation methods in wind farms, aiming at Yantai grid which has relatively large wind farm capacity in Shandong grid. Chapter Four researches VQC device's control principles and regulation strategies when wind power is connected in, according to the grid guide's requirement for wind farm's parallel in, by buiding VQC device's control model and simulation flow chart and base on the analysis on VQC device's control model in traditional grids. In the end, this paper summarizes six suggestions to be considered about reactive power compensation in wind power's parallel in, achieving deep research from theory to practice.