風(fēng)電場集中并網(wǎng)無功電壓協(xié)調(diào)控制研究
[Abstract]:Under the background of worsening environment, shortage of energy and increasing power consumption, wind energy, as an environment-friendly renewable energy, has been paid more and more attention. According to the development of wind power generation technology at home and abroad, the installed capacity of wind turbine is increasing year by year, which shows the momentum of continuous and rapid growth. However, the centralization of wind farms brings many challenges to the grid, and the control of reactive power and voltage is one of them. The fundamental cause of voltage fluctuation is the fluctuation of wind power. Because of the fluctuation and randomness of wind energy resources, the reactive power and voltage regulator with different time scales in wind farm has different response characteristics, which increases the difficulty of reactive power and voltage control. According to this background, the research on reactive power and voltage control of wind farm centralized grid-connected is carried out in this paper. Firstly, the wind speed model and aerodynamics model are modeled and analyzed. Three common fan types including squirrel cage constant speed asynchronous fan, double feed variable speed fan and permanent magnetic direct drive synchronous fan are studied in this paper. The equivalent circuit diagram of squirrel cage type asynchronous fan with constant speed is established, the relation between reactive power, extreme voltage and active power is deduced, the vector control strategy of double feed variable speed fan is studied, and the limit of no power is deduced. The effects of constant speed asynchronous fan grid connection, double feed fan voltage grid connection and constant power factor grid connection on grid voltage are studied. In addition, the performance of several kinds of reactive power and voltage regulating equipment which are often used in wind farm are studied, including combined capacitor group, static synchronous compensator, static stop reactive compensator and on-load voltage regulating transformer. Secondly, the multi-objective optimization problem and the multi-objective particle swarm optimization algorithm are studied and analyzed, and a multi-objective particle swarm optimization algorithm based on adaptive mesh and sector shape is proposed. The principle and flow chart of the algorithm are given in the paper, which is based on the adaptive mesh and sector-shaped particle swarm optimization algorithm (GF-MOPSO),). The adaptive mesh and sector shape are proposed to limit the external archive size and select the global optimal particles and individual optimal particles. At the same time, the particle swarm updating formula is improved. Finally, the multi-objective test function is used to test the G / F MOPSO, and the algorithm shows good performance compared with ACG MOPSO. Finally, according to the above-mentioned research foundation, the control mode of grid-connected reactive voltage of wind farm is constructed. Aiming at the level control of wind farm, a two-layer and multi-stage reactive voltage control model is proposed, which takes into account the wind power uncertainty and the response characteristics of multi-time scale voltage regulator. The model of multi-objective problem is established, which is solved by GF-MOPSO, and the decision-making scheme is selected from the optimal solution of Pareto by analytic hierarchy process (AHP). The typical topology diagram of the grid-connected multi-wind farm is used to verify that the proposed model can effectively restrain the voltage fluctuation caused by wind speed fluctuation and reduce the number of adjustment times of the discrete device to achieve the purpose of economy.
【學(xué)位授予單位】:東北大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TM614;TM714.2
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