Predictive Direct Virtual Torque and Power Control of Doubly Fed Induction Generators for Fast and Smooth Grid Synchronization and Flexible Power Regulation
Predictive Direct Virtual Torque and Power Control of Doubly Fed Induction Generators for Fast and Smooth Grid Synchronization and Flexible Power Regulation
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双馈感应发电机的预测直接虚拟扭矩和功率控制，实现快速、平稳的电网同步和灵活的功率调节
DOI：
10.1109/tpel.2012.2219321
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发表时间：
2013-01
影响因子：
6.7
通讯作者：
Dorrell D. G.
中科院分区：
文献类型：
--
作者：
Yongchang Zhang;Platt G.;Qishuang Ma;Dorrell D. G.
电机的预测直接转矩控制已经得到了很好的发展。它结构简单，具有良好的稳态和暂态性能。然而，在发电领域的应用方面的进一步发展仍在调查中。本文提出了一种双馈感应发电机的预测性直接虚拟转矩和功率控制策略，该策略可以实现快速平稳的电网同步，以及灵活的有功和无功调节。在空载模式下，采用预测直接虚拟转矩控制来满足并网条件。在并网模式下，采用预测直接功率控制实现灵活的有功和无功调节。为了简化控制系统结构，提高可靠性，提出了一种无位置传感器的转子位置控制方案。此外，还引入了一种基于模型的预测方案来补偿数字实现中的一步延迟。所提出的控制策略非常简单，并且具有很强的鲁棒性。开关频率恒定，同时满足电网同步平稳、快速的要求。在不改变开关表的情况下，实现了从空载到灵活功率调节的过渡。利用MATLAB/Simulink对所提出的控制策略进行了仿真验证，并在20kW的实验室样机上进行了实验验证。
Predictive direct torque control of the electric motors has been well developed. It is simple and has excellent steady state and transient performance. However, further developments are still under investigation for applications in the field of power generation. This paper presents a predictive direct virtual torque and power control strategy for a doubly fed induction generator, which allows fast and smooth grid synchronization, and flexible active and reactive power regulation. In the no-load mode, predictive direct virtual torque control is employed to meet the grid synchronization conditions. In the grid-connected mode, predictive direct power control is utilized to achieve flexible active and reactive power regulation. To simplify the control system structure and improve the reliability, a sensorless rotor position scheme is proposed. Furthermore, a model-based predictive scheme is introduced to compensate for a one-step delay in the digital implementation. The proposed control strategy is very simple and robust. There is constant switching frequency, while the requirement of smooth and fast grid synchronization is fulfilled. The transition from no load to flexible power regulation is achieved without changing the switching table. The proposed control strategy was tested by simulation using MATLAB/Simulink and experimentally validated on a 20-kW laboratory prototype.
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