大规模双馈型风电场接入电网的性能分析与稳定控制

发布时间：2018-03-07 02:15

本文选题：双馈风电机　切入点：风电场稳态模型　出处：《西南交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着大规模风电的接入,电网的风电渗透率越来越高,由于风电本身所具有的波动性和间歇性等特征,其对电网的影响也日趋明显,引起了研究人员的广泛重视。研究大规模风电接入电网的首要问题是如何考虑大规模风电场的等效,并在等效模型的基础上研究其接入后对电力系统的静态、动态的影响和稳定性控制策略具有重要的意义。首先,本文建立了风电场的稳态数学模型,在稳态模型的基础上分析研究了风电场接入对系统的潮流和网损的影响。在MATLAB/Simulink中搭建了IEEE 3机9节点系统仿真模型和风电场的稳态模型,仿真分析了各条支路的传输损耗随风电场接入容量增加的变化情况,分析了系统的潮流分布和网损情况。然后,本文建立了风速、双馈风电机组和风电场的动态数学模型；建立风力发电机组中的各子模块动态模型,包括：风力机的机械轴系模型、d-q坐标系下的双馈感应发电机动态模型。研究了基于动态模型的双馈风电场的等效方法,给出了风电场电气部分参数的等值模型,仿真分析了等效前后风电场对于四种不同风速的响应。以IEEE 3机9节点系统为例,在MATLAB/Simulink中搭建了等效前后的仿真模型,验证了本文的等效方法在分析大规模风电场中的有效性。并对在输电线路三相短路故障时风电场的接入对电网母线处电压、有功功率、无功功率造成的影响,以及等值模型和实际模型的接入情况分别进行了仿真对比分析。通过三种不同情况下等值模型与实际模型接入电网情况的对比,验证了该风电场的动态等值模型的有效性和在并入电网进行分析时的适用性。最后,在已建立的双馈风电场的动态模型的基础上,研究了基于双馈风力发电机组的电力系统稳定器的设计方法。通过系统特征矩阵获得系统特征根,然后依据特征根的分析结果对附加稳定器的参数进行优化,达到增加含双馈风电机组的电力系统的稳定性。基于MATLAB/Simulink仿真平台,搭建了含等效风电场的IEEE 3机9节点系统仿真模型。基于该仿真模型对该稳定性控制方法进行了仿真验证。通过时域仿真分析对比了风电机组装设附加稳定控制器和不装设附加稳定控制器的情况。结果表明,双馈风电机组装设附加阻尼控制器,并通过本文的方法设置有效的控制参数,将有效的提高含风电机组的电力系统的动态稳定性。
[Abstract]:With the access of large-scale wind power, the wind power permeability of power grid is higher and higher. Due to the volatility and intermittency of wind power itself, the influence of wind power on power grid is becoming more and more obvious. The most important problem in the study of large-scale wind power access to power grid is how to consider the equivalence of large-scale wind farm, and study the static state of power system on the basis of equivalent model. Dynamic influence and stability control strategy are of great significance. Firstly, the steady mathematical model of wind farm is established. Based on the steady-state model, the influence of wind farm access on the power flow and network loss of the system is analyzed. The simulation model of IEEE 3-bus system and the steady-state model of wind farm are built in MATLAB/Simulink. The change of transmission loss of each branch with the increase of wind farm access capacity is analyzed, and the distribution of power flow and network loss are analyzed. Then, the dynamic mathematical models of wind speed, doubly-fed wind turbine and wind farm are established in this paper. The dynamic models of sub-modules in wind turbine are established, including the dynamic model of doubly-fed induction generator based on the mechanical shafting model of wind turbine in d-q coordinate system. The equivalent method of doubly-fed wind farm based on dynamic model is studied. The equivalent model of electrical parameters of wind farm is given, and the response of the equivalent wind farm to four different wind speeds is simulated and analyzed. Taking the 9-bus system of IEEE 3 machine as an example, an equivalent simulation model is built in MATLAB/Simulink. The effectiveness of the equivalent method in analyzing large-scale wind farms is verified, and the influence of wind farm access on the voltage, active power and reactive power of the grid bus in the case of three-phase short circuit fault of transmission lines is verified. And the access of the equivalent model and the actual model are simulated and analyzed respectively. The comparison between the equivalent model and the actual model in three different cases is carried out. The validity of the dynamic equivalent model of the wind farm and its applicability in the analysis of the grid are verified. Finally, on the basis of the established dynamic model of the doubly-fed wind farm, The design method of power system stabilizer based on doubly-fed wind turbine is studied. The system eigenvalue is obtained by the system characteristic matrix, and the parameters of the additional stabilizer are optimized according to the analysis results of the eigenvalue. To increase the stability of power system with doubly-fed wind turbine. Based on MATLAB/Simulink simulation platform, A 9 bus system simulation model of IEEE 3 machine with equivalent wind farm is built. The stability control method is verified by simulation based on the simulation model. The additional stability control of wind turbine installation is compared by time domain simulation analysis. Devices and cases where additional stability controllers are not installed. The results show that, The doubly-fed wind turbine is equipped with additional damping controller, and the effective control parameters are set by the method in this paper, which will effectively improve the dynamic stability of the power system with wind turbine.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614;TM712

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