Abstract
Due to the increase in DC load and DC Power generation, the need for DC power system is emerging. Accordingly, FRT (fault ride through) and LVRT (low voltage ride through), which are related regulations for renewable energy sources, have been enacted, and operation algorithms of each converter are required for this. However, the operation of the converter according to LVRT regulations causes DC voltage fluctuations. In the current study, DC voltage fluctuation is suppressed through converter control of DC-linked battery. The controller was designed from the relational equation between DC voltage and instantaneous power of battery. The pattern of DC voltage fluctuations to the output of the PV (photovoltaic), which is a DC power generation source, was confirmed, and voltage fluctuation suppression was verified by applying the designed converter cooperation algorithm and controller.
Highlights
Around the world, population density around large cities has caused the power load density to continue to increase
Fluctuation of the DC link is suppressed by battery control
This paper proposes a battery control that is used together with a renewable energy distributed power source to suppress DC link voltage fluctuations
Summary
Population density around large cities has caused the power load density to continue to increase. The increase in load density has led to the demand for the expansion of new large-scale power plants, but the construction of large-scale power plants is in a state of being impossible due to the NIMBI (not in my back yard) phenomenon. The need for DC microgrid has emerged as the DC load increases. Since PV has a characteristic that the amount of power generation varies greatly depending on the time or weather, it causes a large power change in the DC link, and the change in power causes the voltage fluctuation in the DC link. A DC link capacitor used for ripple suppression may increase or decrease the current flowing through the capacitor when a power imbalance occurs
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