Abstract
When a voltage drop occurs on the grid side, an overvoltage may occurs on the DC side of the inverter circuit of the grid-connected photovoltaic (PV) power generation system, it will threaten the normal operation of the DC side capacitor and the grid side inverter circuit. At the same time, the capacitor and inverter circuit will be destroied when the overvoltage is serious. This paper deduces the improved engineering mathematical model of photovoltaic cells and photovoltaic cell output characteristics model; and in order to solve the issue of overvoltage on DC side during low voltage ride-through (LVRT), a LVRT control strategy that actively limits the output power of PV cells and stabilizes the DC bus voltage is proposed. The strategy feeds forward the output power of the inverter to the control system. By controlling the terminal voltage of the PV cell, the output power of the PV cell is balanced with the output power of the inverter, and the DC bus voltage is stabilized. Based on the MATLAB simulation software, a grid-connected model of PV power generation system was set up. The comparison of the engineering model and the physical model of the PV cell under different operating conditions verified the feasibility of the proposed mathematical model and output model; the effectiveness of the proposed method is verified by simulation of active LVRT strategy under different working conditions.
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