【作者】 高群；

【导师】 余贻鑫；

【作者基本信息】 天津大学 ， 电力系统及其自动化， 2010， 硕士

【摘要】 随着风电场建设规模的日益扩大,风电对接入电力系统的影响也越来越大。所以,对于含有风电场的电力系统,需要建立正确的数学模型,借以实现对该系统进行仿真分析。由于风力发电机的单机容量相对较小,大型风电场往往由数百台风力发电机组成。对于大型互联电力系统,有必要研究接入风电场的动态等值方法,以减少含风电电力系统的分析规模和仿真时间。本文针对恒速恒频风力发电机组,研究其动态等值问题,主要工作如下:1、介绍了恒速恒频发电机组的数学模型,包括空气动力系统模型、传动机构模型、异步发电机模型以及桨距角控制环节模型,并在DigSILENT软件平台上实现了恒速恒频风电机组的建模。2、介绍了可用于大维数系统优化问题求解的猴群算法,并加以改进,将其成功的引入到风电场的动态等值问题中;进而基于DIgSILENT软件平台,使用DPL语言实现了该算法的编程应用。3、介绍了动态等值的定义及流程,以及风电场动态等值的具体实现过程。4、采用临界清除时间作为等值方法的评价标准,对不同型号的异步发电机进行动态等值分析。结果表明,采用猴群算法进行风电场动态等值前后的系统,临界清除时间基本一致,说明了猴群算法应用于风电场等值的有效性;与加权法相比,该算法具有明显的精度优势;与遗传算法相比,该算法更稳定、收敛更快。更多还原

【Abstract】 With the increase of wind farm penetration on power systems, the wind farms begin to have a more and more important influence on power systems. In order to analyze dynamic performance of power systems with wind farms, adequate wind farms models need to be developed. Compared to conventional power plants, large wind farms consist of a large number of generators of small size, sometimes up to several thousands. As a result, when doing dynamic simulation for a large interconnected power system, in order to reduce the complexity of power system analysis and the simulation time, equivalent wind farm models have to be developed. This paper will focus on the dynamic equivalence of fixed speed wind turbines,and the main research achievements are as follows:1. A detailed model of fixed speed wind turbine is developed, including the wind power model, drive train model, generation system model and pitch angle control model. This model has been implemented in DIgSILENT.2. In this paper, monkey algorithm is studied, which is used to solve the optimization of multivariate systems. It is improved, and then proposed to be applied to dynamic equivalence of wind farms. This algorithm is realized by DPL in DIgSILENT.3. The definition and processes of dynamic equivalence is introduced. inluding how to apply to wind farms.4. In this paper, the critical clearing time is considered to be the evaluation criteria of equivalence method, and dynamic equivalence of several different types of fixed speed wind turbines is analyzed. The critical clearing time of the equivalent system is very similar to the real system, which validates that the algorithm can be applied to dynamic equivalence of wind farms, and has high accuracy. Compared to weighted method, the method in this paper has much higher accuracy. Compared to genetic algorithm, monkey algorithm is more stable and converges faster.更多还原