About Three-phase current balance of photovoltaic inverter
The setup consists of a three-phase imposed voltage inverter with a passive output filter that connects to a three-phase low voltage grid (220 V) via a Y–Y transformer. Resistive loads, together with transformer impedance, emulate a distribution network operating with current unbalance.
The setup consists of a three-phase imposed voltage inverter with a passive output filter that connects to a three-phase low voltage grid (220 V) via a Y–Y transformer. Resistive loads, together with transformer impedance, emulate a distribution network operating with current unbalance.
The results under two-phase and three-phase dip in the grid voltage shows that the proposed control strategy injects maximum reactive and active power and limits the inverter current by.
Nonisolated three-level inverter has the problem of leakage current and neutral-point (NP) potential imbalance in photovoltaic grid-connected system. Therefore, a new subregional vector-optimized modulation strategy is proposed, which can be adopted to achieve leakage current suppression and NP potential balance control in full power factor and .
All the control, MPPT, and grid-current are implemented in the DC-AC stage (inverter) that consists of a three-phase bidirectional power flow PWM voltage source inverter (VSI3). This is the principal power electronics circuit of a Three-Phase Grid-Connected PV Power System.
In order to obtain the low cost, high efficiency, and low distorted grid-connected current, a T-type three-level inverter topology with three-level boost maximum power point tracking (MPPT) controller and related control strategies are proposed for high-power photovoltaic (PV) applications.
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