【作者】 付永良；

【导师】 王奔；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2013， 硕士

【摘要】 随着风力发电技术的不断发展以及风电场容量的持续增加,风电的并网技术也变得日趋重要。在众多风电并网技术中,柔性直流输电技术(VSC-HVDC)能够为风电场及交流系统提供一定的无功功率支持,十分适用于风电场与电网间的互联。本文着重研究了双馈风力发电机的矢量控制和用于风电并网的VSC-HVDC的无源控制策略。本文分析、介绍了风电并网的输电方式,并详细阐述了基于VSC-HVDC风电并网的技术优势。为分析风电场的特点,研究了双馈发电机的特性及其矢量控制,并通过Matlab/Simlink的仿真表明,双馈风力发电机的矢量控制策略能够实现有功功率、无功功率的独立控制以及最大风能捕获。本文针对VSC-HVDC系统的数学模型,证明了VSC系统是无源系统,根据系统的控制要求,设计了两种无源控制器：一种是基于欧拉-拉格朗日(EL)的无源控制器,在该控制策略下,风电场侧换流器均采用定有功功率和定无功功率控制,省去了外环PI控制器,简化了控制率,电网侧换流器均采用定直流电压和定无功功率控制,以实现直流电压的恒定和无功功率传输；另一种是基于端口受控的哈密顿模型(PCHD)的无源控制器,该控制方法就是通过选取期望的互联与阻尼配置和哈密顿函数,以实现对参考值的跟踪。最后,利用Matlab/Simlink对基于VSC-HVDC的风电并网系统进行了整体仿真,结果表明VSC-HVDC系统能够在一定的程度上隔离电网故障对风电场的影响,并能为风电场提供一定的无功支持；两种控制器均能实现有功功率、无功功率的独立控制,且具有良好的暂态控制性能。更多还原

【Abstract】 With the continuous development of the wind power generation technology and the increasing expansion of the capacity of the wind farm, the wind power transmission is becoming gradually important. Among many grid connection technologies of wind farms, HVDC-Flexible transmission (VSC-HVDC) provides reactive support for the wind farms and AC systems. It is very suitable for interconnection between the wind farms and grid. This paper focuses on the vector control of doubly-fed wind power generator and passive-based control strategy of VSC-HVDC.The transmission methods of Grid Connection technology of Wind Farms are analyzed in this paper. And the advantages of VSC-HVDC used in grid-connected wind farms are elaborated. To analyze the characteristics of the wind farm, the performance and vector control of doubly-fed generator are studied. The simulation results in Matlab/Simlink show that the vector control strategy of doubly-fed wind generator can realize the independent control for active power and reactive power and the maximal power capture.The mathematical model of VSC-HVDC system is built and VSC system is proved to be a passive system in this paper. Two passive controllers of inner loop are designed according to the requirements of the control system. One is passive controller based on Lagrange (EL) model, the outer ring of the PI controller is eliminated by using the given active power and constant reactive power control on the side of the wind farm rectifier to simplify the controller, it can achieve the DC constant voltage and the reactive power transmission by using the constant DC voltage and reactive power control on the side of the grid inverter under the control strategies; the other is passive controller based on port controlled Hamiltonian model (PCHD). By selecting the desired interconnection and damping configuration, the control method is to track reference value using Hamiltonian function. Finally, Matlab/Simulink simulation results show that the VSC-HVDC system can realize grid fault isolation. And it provides a certain amount of reactive power for wind farms. The designed two controllers can achieve independent control for active power and reactive power with good transient performance.更多还原