摘要
随着风电装机容量的不断提升,高比例风电接入加剧了电网的低惯量、弱阻尼等特性,给电网安全稳定运行带来了严峻挑战。传统电流控制型策略因采用锁相环而难以在弱电网中获得准确的电网同步信息,而基于电压控制构建功率平衡方程获取同步角度,在弱电网下具有良好的运行性能。为此,首先以外环同步方式和内环控制结构分类研究电压控制型的结构变形;然后针对弱电网场景,结合阻抗/导纳建模对电压控制型弱网稳定性进行分析,提出在复杂电网场景下抑制中高频振荡策略;同时介绍了大功率电压控制型双馈风电机组在现场运行测试情况;最后指出了电压控制型发展方向,为后续研究提供参考。
With the increasing proportion of wind turbines,the characteristics of low inertia and weak damping of power grid become more obvious,which brings new challenges to the smooth operation of power grid.Traditional current-controlled strategy is difficult to obtain accurate grid synchronization information in weak power grid by using phase-locked loop.Based on voltage-controlled,power balance equation is constructed to obtain synchronization angle,which has good operation performance in weak power grid.For this reason,firstly,the outer loop synchronous mode and the inner loop control structure were classified to study the voltage-controlled structural deformation.Then,for the weak power grid scenario,the impedance/admittance modeling was combined to analyze the stability of the voltage-controlled weak power grid.And the strategy of suppressing medium-high frequency oscillation in the complex power grid scenario was proposed.At the same time,the field operation test of high-power voltagecontrolled doubly-fed induction generations(DFIG)was introduced.Finally,the development direction of voltagecontrolled was pointed out to provide reference for the follow-up research.
作者
林鑫
高翔
谢震
许可宝
张兴
LIN Xin;GAO Xiang;XIE Zhen;XU Kebao;ZHANG Xing(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,Anhui,China)
出处
《电气传动》
2022年第22期4-12,共9页
Electric Drive
关键词
弱电网
电压控制型
同步方式
阻抗建模
谐振抑制
weak power grid
voltage-controlled(VC)
synchronous mode
impedance modeling
harmonic suppression
