Hybrid energy storage-containing photovoltaic DC micro-grid coordinated control method
A technology of DC microgrid and hybrid energy storage, which is applied in photovoltaic power generation, parallel operation of DC power supply, load balancing in DC network, etc. The effect of restoring demand, suppressing high-frequency power fluctuations, and signal smoothing
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[0091] For the situation of power fluctuation in the microgrid with photovoltaic power generation, considering that different energy storage devices have their own advantages and disadvantages in suppressing power fluctuations. The present invention is a photovoltaic DC microgrid coordination control method with hybrid energy storage. A hybrid energy storage system composed of a battery and a super capacitor is used to smooth the power fluctuation in the photovoltaic microgrid, and a low-pass filter is used to take care of the battery and the super capacitor. Then, the driving pulse is generated by comparing the reference current of the hybrid energy storage system with the actual current, and the working mode of the bidirectional DC / DC converter is controlled by the comparator, so as to achieve the effect of maintaining the power balance in the system. If the hybrid energy storage system is not enough to smooth the power fluctuations in the system, the bidirectional DC / AC conv...
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