双馈型风电场参与电压无功调节的分层控制方案  

Hierarchical control strategy of voltage and reactive power for DFIG wind farm

作　　者：刘皓明[1] 唐俏俏[1] 朱凌志[2] 赵大伟[2] 李晨晨[1] 石磊[3] 

机构地区：[1]河海大学能源与电气学院,江苏南京211100 [2]中国电力科学研究院,江苏南京210003 [3]国电南瑞科技股份有限公司,江苏南京210061

出　　处：《电力系统保护与控制》2014年第24期79-85,共7页Power System Protection and Control

基　　金：国家863高技术基金项目(2013AA050601)~~

摘　　要：针对弱联接风电场并网点电压波动问题,通过对双馈风电机组功率关系分析,以及电机定子、网侧换流器功率极限的推导,在传统的无功控制方案的基础上,提出了一种在电压跌落时机组发出无功以稳定电压的无功控制模式。可以根据电网电压波动情况,选择参与无功控制机组数量,充分发挥双馈风电场的无功能力,减少使用率不高的无功补偿装置的投资。基于PSCAD/EMTDC平台搭建风电场接入电网仿真系统,仿真结果验证了所提控制方案的有效性。Considering the problems of voltage fluctuations of weak connection wind farm, through the analysis of DFIG’s power flow and derivation of the stator and grid-side converter’s power limitation, the paper proposes a reactive power hierarchical control strategy that compensates reactive in priority when voltage drop, based on traditional reactive power control modes. The reactive power hierarchical control strategy chooses appropriate DFIG units according to the level of voltage fluctuations. That takes advantage of capability of DFIG reactive power, and saves the investment of the low-frequency reactive compensation device. Finally, the simulation model of small scale wind farm connecting to gird is built based on PSCAD/EMTDC simulation platform, the results prove that the proposed control strategy is effective.

关 键 词：双馈电机 功率极限 无功控制 电压调节 分层控制 

分 类 号：TM761[电气工程—电力系统及自动化]