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PV-hybrid storage based DC microgrid is an effective large-scale application of PV generation. In this paper, the stability of the PV-hybrid storage based DC microgrid is analyzed based on the source-load impedance model and the stability rule is presented. Furthermore, the dynamic energy management strategy of PV-hybrid storage based DC microgrid is developed to both ensure the stable operation of the DC microgrid and realize the full utilization of the PV generation energy. A downscaled DC microgrid experimental prototype is developed and the detailed experimental results validate the correctness and feasibility of theoretical analysis and energy management strategy.

To suppress the conducted EMI of PWM adjustable speed system, the generation mechanism and coupling route have been analyzed in this paper. According the differential generation mechanism, coupling route and source distribution of the interference, corresponding suppression measure were adopted from interference source and coupling route. The overshoot across the power electronics and the value of du/dt can be decreased by using snubber. According to the coupling route of the conducted EMI, the system can be divided into two parts by the converter and the conducted EMI propagation can be blocked from the view of leakage current and common mode voltage. An active filter can be used to compensate the leakage current and cancel the common mode voltage. A new filter configuration is developed for the conducted EMI noise suppression based on the theoretical analysis. The effectiveness of the proposed method is verified by the experimental results.