Abstract To deal with the DC-link overvoltage during high-voltage ride-through (HVRT) of the wind turbine, a coordinated DC-link voltage control (CDVC) scheme is proposed for enhancing the HVRT performance of offshore doubly-fed induction generator (DFIG) wind turbines equipped with the supercapacitor energy storage system (SESS). This scheme is formulated as a two-stage control problem depending on the depth of grid voltage swell, which can prevent damaging the converter resulting from the insufficient reactive support in the first stage, and achieve efficient coordinated control under various magnitude and timescale of grid voltage swell. In the first stage, considering the dynamic behavior of the DFIG during HVRT, a voltage-dependent reactive current control (VRCC) scheme is designed to regulate the current reference of the wind turbine. The first stage aims to supply fast reactive current support without the DC chopper. In the second stage, once the DC-link voltage exceeds the predefined threshold, a coordinated control scheme considering the SESS and the wind turbine operation is implemented using model predictive control (MPC), aiming to regulate the excessive active power by tracking the current reference from the first stage. The proposed control scheme is validated in PSCAD/EMTDC under various operational scenarios. Case study results show that the proposed scheme can effectively mitigate the DC-link overvoltage and enhance HVRT capability under asymmetrical and symmetrical voltage swells.

中文翻译：

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基于 MPC 的直流母线电压控制，用于增强海上双馈风力发电机的高压穿越

摘要 针对风电机组高压穿越（HVRT）期间的直流母线过电压，提出了一种协调直流母线电压控制（CDVC）方案，以提高海上双馈感应发电机的高压穿越性能。 DFIG) 配备超级电容器储能系统 (SESS) 的风力涡轮机。该方案根据电网电压骤升的深度制定了两级控制问题，可以防止因第一级无功支持不足而损坏换流器，实现不同幅度和时间尺度电网电压下的高效协调控制。胀。在第一阶段，考虑到 HVRT 期间 DFIG 的动态行为，设计了一种电压相关的无功电流控制 (VRCC) 方案来调节风力涡轮机的电流参考。第一阶段旨在在没有直流斩波器的情况下提供快速无功电流支持。在第二阶段，一旦直流母线电压超过预定阈值，使用模型预测控制 (MPC) 实施考虑 SESS 和风力涡轮机运行的协调控制方案，旨在通过跟踪电流参考来调节过多的有功功率从第一阶段开始。建议的控制方案在各种操作场景下在 PSCAD/EMTDC 中得到验证。案例研究结果表明，在不对称和对称电压骤升下，所提出的方案可以有效减轻直流链路过电压并增强 HVRT 能力。使用模型预测控制 (MPC) 实施考虑 SESS 和风力涡轮机运行的协调控制方案，旨在通过跟踪来自第一阶段的电流参考来调节过多的有功功率。建议的控制方案在各种操作场景下在 PSCAD/EMTDC 中得到验证。案例研究结果表明，在不对称和对称电压骤升下，所提出的方案可以有效减轻直流链路过电压并增强 HVRT 能力。使用模型预测控制 (MPC) 实施考虑 SESS 和风力涡轮机运行的协调控制方案，旨在通过跟踪来自第一阶段的电流参考来调节过多的有功功率。建议的控制方案在各种操作场景下在 PSCAD/EMTDC 中得到验证。案例研究结果表明，在不对称和对称电压骤升下，所提出的方案可以有效减轻直流链路过电压并增强 HVRT 能力。