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In this paper, the single-stage Maximum Power Point Tracking (MPPT) control strategy for the Aalborg photovoltaic inverter is presented. Aalborg inverter has many advantages, such as high efficiency, wide range of input voltage, minimum voltage drop of the filtering inductors, etc. Nevertheless, it is essentially a “half-bridge” inverter with two input sources, where one source works in MPPT mode,...
This paper presents a power pulsation decoupling strategy for a two-stage single-phase photovoltaic (PV) inverter with film capacitor, which has small capacitance and large voltage ripple. Such large voltage ripple at DC bus is propagated to the PV array and decreases the maximum power point tracking (MPPT) efficiency. To maintain the MPPT efficiency, a new small-signal model which considers the DC...
To improve light load efficiency, a three-phase photovoltaic (PV) based microinverter may operate in single-phase, two-phase or three-phase mode depending on the available input power. Therefore, its DC link capacitor may be subjected to large peak-to-peak voltage ripple when operating in phase skipping mode. This paper determines the minimum value of the DC link capacitor by allowing the maximum...
This paper presents a novel low-cost photovoltaic (PV) microinverter with an ultra-wide MPPT voltage range. This approach is based on the two-stage energy conversion where the front-end boost half-bridge DC-DC converter is used to step up the fluctuating PV voltage to a stabilized high DC voltage, which is next transformed to a grid compliant AC voltage by the grid-tied inverter. The operation principle...
Double line frequency ripple (2ω ripple) power inherently exists in single phase dc-ac or ac-dc pulse width modulation converters because of instantaneous power unbalance between the dc and ac side. In order to achieve stable operation and maintain a high maximum power point tracking (MPPT) efficiency, traditional single-phase quasi-Z-source inverter (QZSI) for photovoltaic application uses large...
This paper proposes a grid-tied photovoltaic (PV) system consisting of modular current-fed dual-active-bridge (CF-DAB) dc–dc converter with cascaded multilevel inverter. The proposed converter allows a small dc-link capacitor in the three-phase wye-connected PV system; therefore, the system reliability can be improved by replacing electrolytic capacitors with film capacitors. The low-frequency ripple-free...
This paper presents a novel robust maximum power point tracking (MPPT) control for a grid connected photovoltaic (PV) system with reduced DC link capacitance. The voltage source inverter (VSI) integrating the PV system to the grid introduces a double line frequency ripple or current variation into the PV system. This ripple or current variation results in oscillation of operating point around the...
Electrolytic capacitors used in photovoltaic (PV) power conditioning units (PCU) for power decoupling purposes are unreliable. Film capacitors can be adopted instead of electrolytic capacitors if the energy storage requirement of the PCU is reduced, since they offer better reliability and have a longer lifetime. The energy storing capacitor size reduction can be facilitated by allowing DC-link voltage...
The photovoltaic(PV) module has the nonlinear current-voltage characteristics. To track the maximum power in PV-module, maximum power point tracking(MPPT) algorithm is needed in PV power generation system. To use MPPT algorithm, the PV generation system is essential for PV-module's current and voltage. In this paper, a current sensorless MPPT algorithm is proposed for a photovoltaic generation system...
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