Interactions Between DFIGs and SVG and Oscillation Characteristics of Power Grid Connected Wind Turbines
迟永宁, 田新首, 汤海雁, 李想
新能源与储能运行控制国家重点实验室(中国电力科学研究院),北京市 海淀区 100192
CHI Yongning, TIAN Xinshou, TANG Haiyan, LI Xiang
State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute), Haidian District, Beijing 100192, China
基金项目:
国家重点基础研究发展计划项目(973项目) (2012CB215105);
国家自然科学基金项目(51577174);
Project Supported by the National Basic Research Program of China (973 Program) (2012CB215105);
National Natural Science Foundation of China (51577174);
New type power system is formed with large number of non-synchronized generators based on power electronics and reactive power compensation devices connected, making interactions between closely coupled wind generators and power grid or other power electronic driven equipment even more complicated. Operating characteristics of power system may change, and secure and stable operation of power system will face many new challenges. Based on theoretical analysis of grid disturbance transitive process in doubly-fed induction generators (DFIGs) and static VAR generators (SVG), this paper presents their dynamic response characteristics respectively. Expression of interaction between DFIGs and SVG is given with analytical method, and interaction sensitivity to control parameters of DFIGs and SVG is analyzed. Then oscillation characteristics of DFIGs-integrated system are given. At last, time domain simulation is carried out based on theoretical analysis. Simulation results demonstrate correctness of theoretical analysis.
KEY WORDS :DFIGs;SVG;power electronics;interactions;oscillation characteristics;
0 引言
在风力发电技术突飞猛进和政策支持背景下,近些年来风电得到了快速发展,在电力系统中的比重不断攀升,使得风电与电网的交互影响越来越复杂[1-3]。在风电发展方面,双馈风电机组可以降低原动机承受的机械应力,大大提高了能量转换效率,实现了机械部分与电气部分的解耦,以及有功﹑无功功率的解耦控制,提高了并网电力系统的调节能力及稳定性,因此成为目前商业化运行的主力机型之一[4-5]。同时,由于静止无功发生器(static VAR generators,SVG)具有无功补偿迅速且控制灵活的优点,能够有效提高风电并网系统的电压稳定性,也在大规模风电并网系统中得到了广泛应用[6-7]。
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