Abstract
In order to improve maximum power point tracking (MPPT) performance, a variable and adaptive perturb and observe (P&O) method with current predictive control is proposed. This is applied in three-phase three-level neutral-point clamped (NPC) photovoltaic (PV) generation systems. To control the active power and the reactive power independently, the decoupled power control combined with a space vector modulation block is adopted for three-phase NPC inverters in PV generation systems. To balance the neutral-point voltage of the three-phase NPC grid-connected inverter, a proportional and integral control by adjusting the dwell time of small voltage vectors is used. A three-phase NPC inverter rated at 12 kVA was established. The performance of the proposed method was tested and compared with the fixed perturbation MPPT algorithm under different conditions. Experimental results confirm the feasibility and advantages of the proposed method.
Highlights
With increasing energy consumption, the importance of developing renewable energy sources is highlighted
In order to realize the maximum utilization of the PV array, maximum power point tracking (MPPT) becomes of great significance in PV generation systems [6,7,8]
It is well known that the perturbation and observe (P&O) MPPT algorithm is the most popular because of its simple structure and control [6,7,8]
Summary
The importance of developing renewable energy sources is highlighted. A trade-off between steady-state oscillation and fast response is generated for the conventional fixed perturbation P&O method Another wellknown MPPT scheme is incremental conductance (INC), which achieves maximum power point (MPP) by comparing the INC of the PV array [9,10,11]. The MPC algorithm uses only one voltage vector in every switching period, and it needs high switching frequency to ensure performance improvement Another method is current predictive control, which is essentially a digital control strategy and has been broadly employed in power electrics converters and motor drives [21,22,23,24]. A variable and adaptive P&O method with current predictive control is proposed This is applied in three-phase three-level NPC grid-connected photovoltaic generation systems. Main experimental results were obtained for both the steady-state and dynamic responses to show the effectiveness of the proposed method
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