Hybrid energy storage control method suitable for voltage control of off-grid type DC microgrid
A technology of DC micro-grid and voltage control, applied in parallel operation of DC power supplies, battery circuit devices, collectors, etc., to achieve fast response and compensation capabilities, easy implementation, and broad application prospects
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[0028] The present invention will be further described below in conjunction with the accompanying drawings.
[0029] Such as figure 1 As shown, the present invention takes a simplified off-grid DC microgrid as the research object. The microgrid is mainly composed of photovoltaic arrays, unidirectional DC-DC converters, batteries, supercapacitors, bidirectional DC-DC converters, loads and other parts composition. Among them, the photovoltaic array is connected to the DC bus through a unidirectional DC-DC converter. Under normal circumstances, the unidirectional DC-DC converter adopts the maximum power output control mode; into the DC bus.
[0030] When the photovoltaic array is full of solar energy during the day, the electric energy generated by the "photovoltaic" effect passes through the unidirectional DC-DC converter to supply power to the load on the DC bus of the system, and the excess electric energy is used for hybrid energy storage on the DC bus. The system is charg...
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