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Modeling and Control of Dual-Stage High-Power Multifunctional PV System in d - Q - o Coordinate

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5 Author(s)
Xianwei Wang ; State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, China ; Fang Zhuo ; Jing Li ; Lin Wang
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A high-power photovoltaic (PV) system based on dual-stage topology of boost converter plus paralleled four-leg inverter is presented, which can perform as both grid-connected inverter and active power filter. The system not only can allow a wide range of input voltage from PV arrays, but also can compensate the nonlinear and unbalanced load current. This paper first presents the small-signal model of the presented inverter with LCL filter in d -q-o coordinate; then, the unified control strategy which combines PV power injection and distortional current compensation is demonstrated; finally, a method to control the zero-sequence circulating current between paralleled inverters is proposed. Simulations and experimental results are carried out on a 100-kVA prototype to validate the practicability of the whole system.

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IEEE Transactions on Industrial Electronics  (Volume:60 ,  Issue: 4 )