直驱永磁同步风电系统综合协调控制及其关键技术的研究

发布时间：2019-04-24 11:21

【摘要】：风能是一种取之不尽、用之不竭的环境友好型清洁能源,使得风力发电受到人们越来越多的关注。直驱永磁同步风电机组作为未来发展的主要机型,该类型的风电大规模地接入电网导致的大量技术问题不容忽视。为了减少其对电力系统的带来的不利影响,实现风电系统与电网和谐发展、互利共赢,使得对直驱永磁同步风电系统并网综合协调控制的研究具有十分重要的意义。论文以直驱永磁同步风力发电系统为研究对象,研究了其并网综合协调控制及一些关键技术。首先,建立了永磁同步发电机静动态数学模型,提出了一种基于矢量控制的永磁同步电机直接参数辨识的方法。仿真与实验结果表明,该参数辨识算法是有效的,可以实现定子电阻Rs、d轴电感Ld、q轴电感Lq和永磁体磁链ψf离线参数辨识。其次,建立了风力机系统和变流器数学模型,设计了风力机系统及发电机侧变流器的控制策略以及具有解耦控制器的电压定向控制的电网侧变流器控制策略。仿真结果表明,建立的模型和设计的控制策略是正确的和有效的,且具有较好的动态特性。然后,针对含直驱永磁同步风电机组的电力系统,提出了直驱型风电节点在网络方程中的处理方法,并进行了并网动态仿真的研究。最后,针对传统控制方法的不足,提出了一种直驱型风力发电系统并网综合协调控制方法。对单机无穷大系统和多机系统算例分别做了仿真研究。仿真结果表明,上述并网综合协调控制方法能结合桨距角控制器合理协调有功和无功出力,能很好地为并网点电压提供无功支持以提高系统的电压稳定性,此外也在一定程度上有利于多机系统的功角稳定。
[Abstract]:Wind energy is an inexhaustible and environmentally friendly clean energy source, which makes wind power generation more and more concerned. Direct-drive permanent magnet synchronous wind turbine as the future development of the main models, this type of wind power large-scale access to the grid caused by a large number of technical problems can not be ignored. In order to reduce the adverse effects on the power system, realize the harmonious development of wind power system and power grid, and win-win results, it is very important to study the integrated coordinated control of direct-drive permanent magnet synchronous wind power system. Taking the direct drive permanent magnet synchronous wind power generation system as the research object, the integrated coordinated control and some key technologies of the direct drive permanent magnet synchronous wind power generation system are studied in this paper. Firstly, the static and dynamic mathematical model of permanent magnet synchronous generator is established, and a method of direct parameter identification of permanent magnet synchronous motor based on vector control is proposed. The simulation and experimental results show that the parameter identification algorithm is effective and can be used to identify off-line parameters of stator resistance Rs,d axis inductance Ld,q axis inductance Lq and permanent magnet flux chain 蠄 f. Secondly, the mathematical model of wind turbine system and converter is established. The control strategy of wind turbine system and generator side converter and the control strategy of power grid side converter with decoupling controller are designed. The simulation results show that the model and the designed control strategy are correct and effective, and have good dynamic characteristics. Then, aiming at the power system with direct drive permanent magnet synchronous wind turbine, the processing method of direct drive wind power node in the network equation is put forward, and the dynamic simulation of grid connection is carried out. Finally, aiming at the shortcomings of traditional control methods, a grid-connected integrated coordinated control method for direct-drive wind power generation system is proposed. The simulation results of single-machine infinite bus system and multi-machine system are carried out respectively. The simulation results show that the grid-connected integrated coordinated control method can reasonably coordinate the active power and reactive power output with pitch angle controller, and can provide reactive power support for the node voltage in order to improve the voltage stability of the system. In addition, it is also beneficial to the stability of the power angle of the multi-machine system to a certain extent.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

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