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DC Voltage Control of AC/DC Hybrid Distribution Network with Low-Speed Distributed Wind Energy Conversion Systems

In order to promote the development of low-speed wind sites close to the load center, an AC/DC hybrid distribution system with low-speed distributed wind energy conversion systems (LD-WECS) was constructed in matlab/simulink. An improved control strategy was proposed to solve the DC bus voltage fluctuation caused by low-speed and high-turbulence wind. In the improved control strategy, the hybrid energy storage system (HESS) was installed in front of the DC bus of wind energy conversion systems (WECS), and the feed forward control based on the predicted wind power was used to control the output power of HESS, maintaining the power of DC bus, therefore, DC bus voltage will be more stable. The results show that the improved strategy can stabilize DC bus voltage under high-turbulence wind speed effectively.