双馈风电机组建模及电网故障穿越技术研究
发布时间：2019-02-28 18:46
【摘要】：随着能源危机的出现和环境问题的恶化,发展新能源技术成为了全世界各国的关注热点。风力发电依靠其较为成熟的技术、较低的成本,成为了目前各国应用最广泛的可再生能源之一,并获得了快速发展。但是随着风电并网规模不断增大,单机容量不断提高,对于电网的安全运营和调度提出了更高的要求。电网针对这一问题,出台了相应的风电场并网要求,对风电场并网、电压故障穿越能力等方面提出了更高的要求。双馈风电机组作为目前最为广泛使用的风电机组,由于其结构的特殊性,对电网故障非常敏感,若不采取有效措施,容易导致机组脱网,进一步恶化电网运行。所以如何提高双馈风电机组的故障耐受能力是一个非常值得深入探讨和研究的课题。本文针对这一背景,对双馈风电机组进行了详细的研究。主要包括了对双馈风电机组系统的数学建模分析,建立了包括风力机、传动链、发电机和变流器在内的数学模型,推导了相应的矢量控制策略,并提出了用内模控制的方法来整定控制器的参数,随后在PSCAD/EMTDC软件中建立相应的仿真模型系统,并进行了仿真验证;对双馈风电机组在电网故障情况下暂态情况进行了分析,推导了转子电压电流在电网对称和不对称故障情况下的数学表达式,并提出了相应的双馈风电机组的低电压穿越控制策略,在仿真模型中进行了验证;提出了一种采用超级电容的提高双馈风电机组故障耐受能力的控制策略,介绍了该系统的拓扑结构、超级电容的容值计算以及相应控制策略,并在仿真中验证了该控制策略的有效性。
[Abstract]:With the emergence of energy crisis and the deterioration of environmental problems, the development of new energy technology has become the focus of attention all over the world. Wind power generation, relying on its mature technology and low cost, has become one of the most widely used renewable energy sources in various countries, and has achieved rapid development. However, with the increasing of wind power grid-connected scale and single-machine capacity, higher requirements for safe operation and dispatching of power grid are put forward. In view of this problem, the grid issued the corresponding requirements of wind farm grid connection, and put forward higher requirements for wind farm grid connection, voltage fault traversing capacity and so on. As the most widely used wind turbine at present, doubly-fed wind turbine is very sensitive to grid faults because of its special structure. If no effective measures are taken, it is easy to cause the unit to get out of the grid and worsen the operation of the power grid further. Therefore, how to improve the fault tolerance of doubly-fed wind turbines is a topic worthy of in-depth discussion and research. In view of this background, the doubly-fed wind turbine is studied in detail in this paper. The mathematical models including wind turbine, transmission chain, generator and converter are established, and the corresponding vector control strategy is deduced, which includes the mathematical modeling and analysis of doubly-fed wind turbine system, including wind turbine, transmission chain, generator and converter. The method of internal model control is proposed to adjust the parameters of the controller, and then the corresponding simulation model system is established in PSCAD/EMTDC software, and the simulation verification is carried out. The transient state of doubly-fed wind turbine under power grid fault is analyzed, and the mathematical expressions of rotor voltage and current under symmetrical and asymmetric faults are derived. The low voltage traversal control strategy of the corresponding doubly fed wind turbine is proposed and verified in the simulation model. This paper presents a control strategy to improve the fault tolerance of doubly-fed wind turbine with super capacitor. The topology of the system, the calculation of the capacitance and the corresponding control strategy are introduced. The effectiveness of the control strategy is verified in the simulation.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315
[Abstract]:With the emergence of energy crisis and the deterioration of environmental problems, the development of new energy technology has become the focus of attention all over the world. Wind power generation, relying on its mature technology and low cost, has become one of the most widely used renewable energy sources in various countries, and has achieved rapid development. However, with the increasing of wind power grid-connected scale and single-machine capacity, higher requirements for safe operation and dispatching of power grid are put forward. In view of this problem, the grid issued the corresponding requirements of wind farm grid connection, and put forward higher requirements for wind farm grid connection, voltage fault traversing capacity and so on. As the most widely used wind turbine at present, doubly-fed wind turbine is very sensitive to grid faults because of its special structure. If no effective measures are taken, it is easy to cause the unit to get out of the grid and worsen the operation of the power grid further. Therefore, how to improve the fault tolerance of doubly-fed wind turbines is a topic worthy of in-depth discussion and research. In view of this background, the doubly-fed wind turbine is studied in detail in this paper. The mathematical models including wind turbine, transmission chain, generator and converter are established, and the corresponding vector control strategy is deduced, which includes the mathematical modeling and analysis of doubly-fed wind turbine system, including wind turbine, transmission chain, generator and converter. The method of internal model control is proposed to adjust the parameters of the controller, and then the corresponding simulation model system is established in PSCAD/EMTDC software, and the simulation verification is carried out. The transient state of doubly-fed wind turbine under power grid fault is analyzed, and the mathematical expressions of rotor voltage and current under symmetrical and asymmetric faults are derived. The low voltage traversal control strategy of the corresponding doubly fed wind turbine is proposed and verified in the simulation model. This paper presents a control strategy to improve the fault tolerance of doubly-fed wind turbine with super capacitor. The topology of the system, the calculation of the capacitance and the corresponding control strategy are introduced. The effectiveness of the control strategy is verified in the simulation.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315
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