改善电力系统阻尼特性的双馈风电机组控制策略
A Control Strategy for Increasing Power System Damping with Wind Turbine-driven Doubly-fed Induction Generator
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摘要: 为了增强含有大型风电场的电力系统的机电阻尼,提出了一种新型双馈风电机组的附加阻尼控制策略的设计方法。首先,提出了风电场动态频率特性的概念,推导了动态频率特性的计算公式;然后,基于动态频率特性的概念,证明了风电场对其接入的电力系统产生纯阻尼作用的相位条件和幅值条件,基于这一条件,在传统双闭环控制结构的基础上设计了附加阻尼控制策略。利用电力系统分析综合程序(PSASP),通过2区域和多区域的算例分析证实,所设计控制策略不但具有提高电力系统阻尼的明显效果,而且具有参数易整定、调试方便和易于工程实现的优势。Abstract: In order to enhance the damping of power systems integrated with wind farms,a novel method for designing the additional damping control strategy of wind turbine-driven doubly-fed induction generator（DFIG） is proposed.Firstly,the concept of dynamic frequency character is defined and its calculation formula is deduced.Secondly,based on the concept of dynamic frequency character,the phase and amplitude conditions for wind farms to produce the positive damping effects on their connected power systems are proved.Based on the proved conditions,a damping control strategy is proposed on the basis of the conventional double closed-loop control structure.Finally,by means of Power System Analysis Software Package（PSASP）,case studies on 2-area and multi-area power systems show that the proposed control strategy can improve power system damping,while facilitating parameters tuning,debugging and engineering implementation.
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