双馈风电场的电压无功协调控制策略研究

发布时间：2018-04-23 07:36

本文选题：风力发电 + 双馈异步发电机　；参考：《华北电力大学(北京)》2016年硕士论文

【摘要】：环境污染和化石能源短缺的问题日益受到关注,因此可再生能源在近十年快速地发展,而且在各种可再生能源中,风能的开发利用是发展最迅猛的。双馈异步发电机(DFIG)作为风力发电的主要机型之一,因其可以实现有功和无功的解耦控制和成本优势,被广泛应用。随着风电穿透率的增加,风电并网面临着严峻的挑战,特别是它的电压无功控制变得尤其重要。双馈异步发电机的无功功率控制成为电力系统稳定控制的一个热门话题。目前,电力系统采用柔性交流输电系统装置(FACTS)控制系统中的有功功率和无功功率,这些柔性交流输电系统装置主要包括静态无功补偿器(SVC)、静止同步发生器(STATCOM)等,它们在平滑风电场无功功率和电压控制中已经被广泛应用,而FACTS和发电机组之间的协调控制是改善公共并网点(PCC)电压控制的关键。因此,本文研究了双馈风电场和静止无功发生器的电压无功协调控制策略。本文的目标是优化各无功源的无功输出值,以充分利用双馈风机自身的无功发生能力,提高静止同步发生器的无功裕度和公共并网点的电压稳定性。首先,本文详细分析了双馈风电机组的无功发生能力和电压控制方式。其次,介绍了静止同步发生器的工作原理和特性,它具有较宽的调节范围和迅速无功补偿的能力。再次,分析了双馈风电机组和静止同步发生器的电压灵敏度,然后定义了两者的无功裕度指标。在此基础建立目标函数,提出了本文基于DFIGs和STATCOM的电压无功协调控制策略。最后,在MATLAB/SIMULINK软件中,搭建了风电机群并网模型,并对所提出的策略进行了仿真,结果表明了该控制策略的有效性。
[Abstract]:The problems of environmental pollution and fossil energy shortage have been paid more and more attention, so renewable energy has been developing rapidly in the last decade, and the development and utilization of wind energy is the most rapid in all kinds of renewable energy sources. As one of the main types of wind power generation, doubly-fed induction generator (DFIGG) is widely used for its decoupling control and cost advantage of active and reactive power. With the increase of wind power penetration rate, wind power grid connection is facing severe challenges, especially its voltage and reactive power control becomes particularly important. Reactive power control of doubly-fed asynchronous generator has become a hot topic in power system stability control. At present, the active power and reactive power of the power system are controlled by the flexible AC transmission system (facts). These flexible AC transmission system devices mainly include the static reactive power compensator (SVC), the static synchronous generator (STATCOM), and so on. They have been widely used in smooth wind farm reactive power and voltage control, and the coordinated control between FACTS and generator sets is the key to improve the common node FACTS voltage control. Therefore, the coordinated control strategy of voltage and reactive power for doubly-fed wind farm and static var generator is studied in this paper. The aim of this paper is to optimize the reactive power output of each reactive power source so as to make full use of the reactive power generating ability of the doubly-fed fan and to improve the reactive power margin of the static synchronous generator and the voltage stability of the common node. Firstly, the reactive power generation capacity and voltage control mode of doubly-fed wind turbine are analyzed in detail. Secondly, the principle and characteristics of the static synchronous generator are introduced. It has a wide range of regulation and the ability of rapid reactive power compensation. Thirdly, the voltage sensitivity of doubly-fed wind turbine and static synchronous generator is analyzed, and the reactive power margin index is defined. On this basis, the objective function is established, and a voltage and reactive power coordinated control strategy based on DFIGs and STATCOM is proposed in this paper. Finally, the wind power cluster grid-connected model is built in MATLAB/SIMULINK software, and the simulation results show the effectiveness of the proposed control strategy.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM614

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