变速恒频双馈风力发电机的建模与仿真研究.docVIP

摘 要 由于化石能源终将耗竭以及严重的环境污染，充分开发和利用可替代的清洁可再生能源是解决能源问题和环境问题的必然选择。风能作为全球发展最快的可再生能源，风力发电已成为目前最具规模化开发和商业化发展前景的新能源发电技术。并网运行的风力发电由于得到大电网的补偿和支撑，已成为风力发电的主流。同时，双馈电机由于具有变速运行、有功无功可解耦控制、转差功率小等优点成为最广泛应用的变速恒频风力发电机型。 本论文以变速恒频双馈风力发电机作为研究对象，对其进行了包括运行原理分析、控制策略实现、系统建模及仿真等工作。 对双馈电机运行原理及稳态模型进行介绍后，推导了三相静止坐标系下的双馈电机数学模型，并以此为基础推导了适于应用的其模不变两相同步旋转坐标系下的数学模型。并结合最大风能追踪控制算法，基于P、Q解耦思想，对双馈电机发电运行时定子磁场定向控制策略进行了分析。在对双馈电机发电运行原理进行深入分析的基础上，将双馈电机的数学模型转化为能反映其控制思想的状态方程，利用MATLAB/Simulink分别对电机电量和机械量进行了S函数编程建模，组合成了双馈电机在发电运行时的仿真模型，再结合定子磁场定向控制策略对整个风力发电系统进行了建模。 本论文对变速恒频双馈风力发电机进行了深入分析，对核心的环节进行了基于状态方程的S函数建模，整个系统的仿真模型及结果分析具有极高的实用价值，也为本人在今后的工作中对风力发电的研究奠定了良好的理论基础。 关键词：风力发电；变速恒频；双馈电机；控制策略；S函数 Abstract The exploitation and utilization of renewable energy is inevitable choice for solving energy and environment issue because of gradual exhaustion of the fossil fuel and serious environment pollution. Wind energy, as a kind of renewable energy, has a promising future of being developed in the globe. Wind power has already become a new energy generation technology which is worth of exploiting in scale and an expecting future in commerce. Because of the compensation and sustentation from large power grid, grid-connected wind power has become the main technology in wind power generation. Meanwhile, doubly-fed induction generator(DFIG)has become the most widely applied wind turbine in variable speed constant frequency(VSCF)wind power generation, since it presents many advantages such as variable speed running, the decoupled control of active and reactive power, and the small rotate difference power. This dissertation takes the VSCF doubly-fed wind power generation as the research object, and focuses on its operation principle analysis, control strategy realization, modeling and simulation of system, etc. The main contents include as follows: The operation principle of DFIG and its steady model are produced. The machine model in three-phase stationary reference frame is derived, and based on this, the model in d-q synchronous ro