Modeling of DFIG-Based Wind Turbine for Power System Transient Response Analysis in Rotor Speed Control Timescale
Modeling of DFIG-Based Wind Turbine for Power System Transient Response Analysis in Rotor Speed Control Timescale
复制标题
基于 DFIG 的风力发电机建模，用于转子速度控制时间尺度下的电力系统暂态响应分析
DOI：
10.1109/tpwrs.2018.2827402
复制
发表时间：
2018-11-01
影响因子：
6.6
通讯作者：
Liu, Feng
中科院分区：
文献类型：
--
作者：
Tang, Wangqianyun;Hu, Jiabing;Liu, Feng
现代电力系统的电网故障后的暂态响应和稳定性经历了不同的变化，并产生了关注，特别是对于那些占主导地位的双馈感应发电机（DFIG）为基础的风力涡轮机（WT），因为DFIG为基础的WT的瞬态特性是完全不同的同步发电机（SG）。为了从物理上理解基于DFIG的风力发电机的暂态响应并从理论上分析其暂态稳定性，本文提出了一种在转子速度控制时间尺度（秒左右）内综合考虑控制器的幅相动态模型。该模型从物理上解释了不平衡有功功率以及输出有功/无功功率本身与基于DFIG的WT的内部电压矢量之间的关系，其形式类似于SG。通过与SG的比较，说明了基于DFIG的WT的独特的瞬态相位特性。发现了一个附加的相位限制，超过该相位限制则不存在工作点。基于该模型，对一个简单的基于DFIG的WT主导系统的暂态稳定性进行了理论分析，发现了一种不同于SG主导系统的新的不稳定现象。并对影响暂态稳定性的几个关键因素进行了讨论。
The transient responses and stability followed by grid faults of the modern power systems experience diverse changes and have created concerns, especially for those dominated by doubly fed induction generator (DFIG) based wind turbines (WTs), since the transient characteristics of the DFIG-based WT are totally different from those of a synchronous generator (SG). To physically understand the transient response and theoretically analyze the transient stability of DFIG-based WT, this paper proposes a magnitude/phase dynamical model with synthetical consideration on the controllers in the rotor speed control timescale (around seconds). The proposed model physically explains the relationship between the imbalanced active power as well as the output active/reactive powers themselves and the DFIG-based WT's internal voltage vector, whose form is similar to that of the SG. By comparing with the SG, the distinctive transient phase characteristics of the DFIG-based WT are illustrated. An additional phase limitation is found, exceeding which the operation point does not exist. Based on the proposed model, the transient stability of a simple DFIG-based WT-dominated system is theoretically analyzed, and a new instability phenomenon different from that in an SG-dominated system is identified. Furthermore, some key factors influencing the transient stability are discussed.