This paper proposes an improved dynamic model of lithium iron phosphate battery, and shows the simulation results. The method takes into account the nonlinear characteristics of the battery charging and discharging, and changes the variation of battery resistance into that of voltage, which makes the simulation circuit simpler and easier to be implemented. Simulations examine the time-changing characteristics of the state of charge (SOC), depth of discharge and the current/voltage in the charge/discharge processes, as well as the relationship between voltage and SOC. The model has correctively shown the dynamic characteristics of lithium iron phosphate battery in our simulations.
Due to the impact from the conditioning circuit, it is easy to generate DC component for the reference voltage when the digital signal processor (DSP) sampling the grid voltage. It cannot eliminate the DC component for the grid inverter based on feed-forward decoupling control, and this would bring the DC component to the inverter voltage. The traditional DC component elimination method includes two aspects of hardware and software. This paper presents a new method to eliminate the DC component. The simulation results show that the algorithm is correct by using PSCAD/EMTDC.
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