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首页> 外文期刊>CPSS Transactions on Power Electronics and Applications >Improved control strategy of interlinking converters with synchronous generator characteristic in islanded hybrid AC/DC microgrid
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Improved control strategy of interlinking converters with synchronous generator characteristic in islanded hybrid AC/DC microgrid

机译：孤岛式交直流微电网中具有同步发电机特性的互连变换器的改进控制策略

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摘要

In this paper, an improved control strategy of interlinking converters for hybrid AC/DC microgrid operated in islanding mode is proposed, which applies synchronous generator model to the converters. This enhanced scheme adopts direct frequency control method to realize active power sharing and improves the transient frequency stability by using synchronverter technology. Unlike existing droop control methods of interlinking converters that mostly just focus on power sharing, this scheme can not only maintain proportional power distributed between DC and AC subgrid, but also regulate the AC subgrid voltage directly to improve its poor frequency stability during AC-side loading transitions in autonomous operation. It's noteworthy that this scheme can also keep the AC-side loads working uninterruptedly during AC subgrid faults events by using voltage-controlled method. Moreover, any additional energy storage or inverters are not required to assist interlinking converters for microgrid frequency regulation. The effectiveness of this modified control method is verified by offline time-domain simulation and real-time experiment in MATLAB/Simulink and OPAL-RT digital platform respectively.
机译：本文提出了一种改进的控制策略，该控制策略适用于孤岛模式下的交流/直流混合微电网互连变换器，该模型将同步发电机模型应用于变换器。该增强方案采用直接频率控制方法来实现有功功率共享，并通过使用同步变频器技术提高了瞬态频率稳定性。与现有的互连转换器的下降控制方法主要关注功率共享不同，该方案不仅可以保持直流和交流子电网之间的比例功率分配，而且可以直接调节交流子电网电压，以改善其在交流侧负载期间的不良频率稳定性。自主运行的过渡。值得注意的是，该方案还可以通过使用电压控制方法，在交流亚电网故障事件期间保持交流侧负载不间断工作。此外，不需要任何额外的能量存储或逆变器来协助互连转换器进行微电网频率调节。通过离线时域仿真和实时实验分别在MATLAB / Simulink和OPAL-RT数字平台上验证了这种改进控制方法的有效性。

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