Enhanced Control and Operation of Doubly-Fed Induction Generator Based Wind Farm during Network Unbalance

双馈感应发电机风电场网络不平衡时的强化控制与运行

• 批准号: EP/D029775/1
• 负责人: Lie Xu
• 金额: $ 16.19万
• 依托单位: Queen's University Belfast
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD029775%2F1
• 关键词: Enhanced; Control; Operation; Doubly; Fed

This proposal intends to study the system control and the operation of wind farms based on Doubly-Fed Induction Generators (DFIG), connected to either a transmission system or embedded within a distribution system, when the network voltage is unbalanced. The unbalanced voltage can either be a large transient unbalance caused by asymmetric AC faults or a small steady-state unbalance. The project will first develop a mathematical model which includes a DFIG and two back-to-back connected converters under unbalanced supply. The impact of unbalanced network voltage on the operation of the DFIG and the associated converters will be examined. This project will further explore strategies that can be employed by the DFIG under unbalanced network voltage for providing enhanced operation such as improving the system operation and recovery during and after asymmetric fault, maintaining a balanced stator current, minimising DFIG electric torque pulsation or making a contribution to the rebalancing of the network voltage. Methods for controlling DFIG systems during network voltage unbalance, by providing precise control of the stator/rotor current and if required, the asymmetric active and reactive power outputs, will then be investigated. Experimental tests will be carried out to validate the proposed control strategy.

该提案旨在研究基于双馈感应发电机（DFIG）的风电场的系统控制和运行，该风电场连接到输电系统或嵌入配电系统中，当网络电压不平衡时。不平衡电压可以是由不对称交流故障引起的大的瞬态不平衡，也可以是小的稳态不平衡。该项目将首先开发一个数学模型，其中包括一个 DFIG 和两个不平衡供电下背对背连接的转换器。将检查不平衡网络电压对 DFIG 和相关转换器运行的影响。该项目将进一步探索 DFIG 在不平衡网络电压下可采用的策略，以提供增强的运行，例如改善不对称故障期间和之后的系统运行和恢复、保持平衡的定子电流、最大限度地减少 DFIG 电气扭矩脉动或为网络电压的重新平衡做出贡献。然后将研究在网络电压不平衡期间控制 DFIG 系统的方法，通过提供对定子/转子电流的精确控制，并在需要时提供不对称的有功和无功功率输出。将进行实验测试以验证所提出的控制策略。