一种交直流混合微网能量路由器及其运行模态分析

为更好协调和控制交直流混合微网间能量传输,提出一种交直流混合微网能量路由器。建立所提出能量路由器数学模型,分析该能量路由器不同工作模态时级联整流级相量关系,并推导各混合运行模态限制性条件。针对该交直流混合微网能量路由器,提出相应控制策略,可实现H桥级联整流电路各级独立在AC-DC、DC-DC、DC-AC运行模式间无缝切换以达到交直流混合微网间能量的统一协调与管理。同时,减少了各微网间电力电子变换器的使用,提高各交直流微网间能量传输效率。仿真与实验结果验证了该交直流混合微网能量路由器电路拓扑的实用性及各运行模态时控制策略的正确性与有效性。

An AC-DC Hybrid Microgrid Energy Router and Operational Modal Analysis

In order to better coordinate and control the energy transmission between AC-DC hybrid microgrids, a novel hybrid microgrid energy router is proposed. The energy router mathematical model is computed, the phase or diagram on different operational mode in cascaded rectifier stage is analyzed and the restrictive conditions on hybrid work modes is deduced. For the unified management and harmonization of the energy transferred by energy router in AC-DC hybrid microgrids, the control strategy is presented to implement seamlessly switch among AC-DC, DC-DC and DC-AC operational modes in each module of cascaded H-bridge rectifier stage. In addition, power electronic converters are reduced in microgrids to increase the energy transmission efficiency between AC-DC microgrids. Finally, the simulations and prototype demonstrate the practicability of the AC-DC hybrid microgrid energy router as well as the validity of the control strategy on each operational mode.