含大规模风电场的电网的无功补偿控制策略研究

发布时间：2018-01-06 20:12

本文关键词：含大规模风电场的电网的无功补偿控制策略研究　出处：《华北电力大学》2014年硕士论文　论文类型：学位论文

【摘要】：在大型恒频风力发电系统中，双馈感应发电机组占了很大比重。它可以实现对风能的最大捕获，，具有灵活的无功调节能力。但当电网受到较大扰动时，这种能力接近饱和，双馈风电机组抵御电压跌落的能力减弱，需要采取一定的措施保证风电场的连续稳定运行。本文针对双馈风电机组的无功补偿问题进行了一系列分析研究，通过对目前几种无功补偿装置的分析比较提出了一种联合无功补偿策略，以保持系统电压稳定，满足风电场的并网要求。本文首先介绍了双馈风电机组的工作原理与数学模型，以某个实际风电场为例，应用MATLAB软件对双馈风电机组的稳态与暂态特性进行了仿真分析。其次，本文研究了SVC与STATCOM的数学模型与运行特性,并对这两种无功补偿装置分别提出了相应的控制策略。结合某一实际电网，仿真分析了将SVC与STATCOM这两种无功补偿装置分别应用到该地区风电场中的电压特性。结果表明，SVC与STATCOM均能帮助风电场在电网故障后快速重建电压，且相比之下STATCOM能更好地提高系统电压稳定性，补偿效果优于SVC。最后，本文提出了并联电容器+STATCOM联合无功补偿策略。选用某地区的两个实际双馈风电场为例，在并联电容器与STATCOM不同容量的配合下，仿真分析了电网发生三相短路故障与电网发生单相接地短路故障的风电场输出特性。结果表明该联合无功补偿策略能够有效地提高风电场出口电压以及风电场并网点电压水平，为风电场无功补偿装置的选用提供了一种既有效又经济的补偿策略。
[Abstract]:In large constant frequency wind power generation system, doubly-fed induction generator sets account for a large proportion. It can achieve the maximum capture of wind energy, and has flexible reactive power regulation ability. This capability is close to saturation and the ability of doubly-fed wind turbine to resist voltage drop is weakened. It is necessary to take certain measures to ensure the continuous and stable operation of wind farm. In this paper, a series of analysis and research on reactive power compensation of doubly-fed wind turbine are carried out. Based on the analysis and comparison of several kinds of reactive power compensation devices, a combined reactive power compensation strategy is proposed to keep the system voltage stable and meet the grid connection requirements of wind farms. This paper first introduces the working principle and mathematical model of doubly-fed wind turbine. Taking a practical wind farm as an example, the steady-state and transient characteristics of doubly-fed wind turbine are simulated and analyzed by using MATLAB software. Secondly, this paper studies the mathematical model and operation characteristics of SVC and STATCOM, and puts forward corresponding control strategies for the two kinds of reactive power compensation devices. The voltage characteristics of the two reactive power compensators, SVC and STATCOM, applied to the wind farm in this area are simulated and analyzed. The results show that the two kinds of reactive power compensation devices are applied to the wind farm in this area. Both SVC and STATCOM can help wind farm to reconstruct voltage quickly after power grid failure, and compared with STATCOM, it can improve system voltage stability better, and the compensation effect is better than that of SVC. Finally, this paper proposes a combined reactive power compensation strategy for shunt capacitor STATCOM. Two practical doubly-fed wind farms in a certain area are selected as examples. Under the cooperation of shunt capacitor and STATCOM of different capacity. Simulation results show that the combined reactive power compensation strategy can effectively increase the outlet voltage of wind farm and wind farm, and the output characteristics of wind farm with three-phase short-circuit fault and single-phase grounding short-circuit fault are analyzed. Dot voltage level. It provides an effective and economical compensation strategy for the selection of reactive power compensator in wind farm.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614;TM714.3

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