低短路比电网下含负序控制双馈风机稳定性研究的几个关键问题  

Several Key Issues on Stability Study of DFIG-Based Wind Turbines with Negative Sequence Control during Low Short-Circuit Ratio Power Grids

作　　者：徐海亮 吴瀚 李志 赵仁德[1] 胡家兵[2] Xu Hailiang;Wu Han;Li Zhi;Zhao Rende;Hu Jiabing(College of New Energy,China University of Petroleum(East China),Qingdao,266580,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan,430074,China)

机构地区：[1]中国石油大学(华东)新能源学院,青岛266580 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《电工技术学报》2021年第22期4688-4702,共15页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(52077222);山东省自然科学基金(ZR2020ME202)资助项目。

摘　　要：由于我国风电资源和电力负荷的逆向分布特性,低短路比已成为风电机组接入电网的主要形态。低短路比对称电网下,双馈风机与电网的交互作用易引发系统小干扰失稳。不对称电网下,电网正、负序阻抗及其序间耦合分量将与风机网侧、转子侧变流器产生更为复杂的交互作用,其带来的失稳风险亟需研究和评估。对此,该文综合已有研究,首先,分析低短路比电网下含负序控制双馈风机稳定性研究的关键问题;然后,从阻抗建模、稳定性分析、控制策略改进等方面,提出相应的解决方案;最后,对相关技术发展前景进行讨论和展望。Due to the reverse distribution characteristics of wind power resources and power load in China,low short circuit ratio has become the main form of wind turbines tied into power grid.The interaction between the doubly-fed induction generator(DFIG)—based wind turbines and the power grid is easy to lead to the small interference instability issue under symmetrical power grid with low short circuit ratio.Under asymmetric power grid,the positive and negative sequence impedance and its coupling components will lead to more complex interaction with the grid-side and rotor-side converters,and the instability risk needs to be studied and evaluated.Based on the existing research,the key challenges to the stability of DFIG system with negative sequence control under low short-circuit ratio power grid are analyzed.In view of the key issues,corresponding solutions are proposed,proceeded from the aspects of impedance modeling,stability analysis and control strategy improvement.Finally,the development prospects of related technology are discussed.

关 键 词：双馈风机 低短路比电网 负序电流控制 稳定分析 

分 类 号：TM614[电气工程—电力系统及自动化]