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首页> 外文期刊>Energies >An Optimal Integrated Control Scheme for Permanent Magnet Synchronous Generator-Based Wind Turbines under Asymmetrical Grid Fault Conditions
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An Optimal Integrated Control Scheme for Permanent Magnet Synchronous Generator-Based Wind Turbines under Asymmetrical Grid Fault Conditions

机译：非对称电网故障条件下基于永磁同步发电机的风力发电机组最优集成控制方案

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In recent years, the increasing penetration level of wind energy into power systems has brought new issues and challenges. One of the main concerns is the issue of dynamic response capability during outer disturbance conditions, especially the fault-tolerance capability during asymmetrical faults. In order to improve the fault-tolerance and dynamic response capability under asymmetrical grid fault conditions, an optimal integrated control scheme for the grid-side voltage-source converter (VSC) of direct-driven permanent magnet synchronous generator (PMSG)-based wind turbine systems is proposed in this paper. The optimal control strategy includes a main controller and an additional controller. In the main controller, a double-loop controller based on differential flatness-based theory is designed for grid-side VSC. Two parts are involved in the design process of the flatness-based controller: the reference trajectories generation of flatness output and the implementation of the controller. In the additional control aspect, an auxiliary second harmonic compensation control loop based on an improved calculation method for grid-side instantaneous transmission power is designed by the quasi proportional resonant (Quasi-PR) control principle, which is able to simultaneously restrain the second harmonic components in active power and reactive power injected into the grid without the respective calculation for current control references. Moreover, to reduce the DC-link overvoltage during grid faults, the mathematical model of DC-link voltage is analyzed and a feedforward modified control factor is added to the traditional DC voltage control loop in grid-side VSC. The effectiveness of the optimal control scheme is verified in PSCAD/EMTDC simulation software.
机译：近年来，风能在电力系统中的渗透率不断提高，带来了新的问题和挑战。主要关注之一是外部干扰条件下的动态响应能力问题，尤其是非对称故障期间的容错能力问题。为了提高非对称电网故障条件下的容错能力和动态响应能力，基于永磁同步发电机（PMSG）的直驱风力发电机的电网侧电压源变换器（VSC）的最优集成控制方案本文提出了系统。最佳控制策略包括一个主控制器和一个附加控制器。在主控制器中，针对电网侧VSC设计了基于差分平坦度理论的双环控制器。基于平面度的控制器的设计过程涉及两个部分：平面度输出的参考轨迹生成和控制器的实现。在附加控制方面，基于准比例谐振（Quasi-PR）控制原理设计了一种基于改进的电网侧瞬时传输功率计算方法的辅助二次谐波补偿控制回路，该控制回路能够同时抑制二次谐波。注入电网的有功功率和无功功率的分量，而无需针对电流控制参考进行相应的计算。此外，为了减少电网故障期间的直流母线过电压，分析了直流母线电压的数学模型，并将前馈修正控制因子添加到电网侧VSC中的传统直流电压控制回路中。 PSCAD / EMTDC仿真软件验证了最佳控制方案的有效性。

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