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Lifetime of Photovoltaic (PV) inverters is affected by the installation sites related to different solar irradiance and ambient temperature profiles (also referred to as mission profiles). In fact, the installation site also affects the degradation rate of the PV panels and, thus, long-term energy production and reliability. Prior-art lifetime analysis in PV inverters has not yet investigated the...
In order to enable a more wide-scale utilization of PV systems, the cost of PV energy has to be comparable with other energy sources. Oversizing the PV array is one common approach to reduce the cost of PV energy, since it increases the PV energy yield during low solar irradiance conditions. However, oversizing the PV array will increase the loading of PV inverters, which may have undesired influence...
As days go, renewable energy resources getting lot of consideration due to the growing demand of energy. In view of all the renewable energy resources, solar energy is very prominent because sunlight is obtainable all over the year. This research work concentrates on performance and reliability enhancement of grid-connected Solar Photo Voltaic (SPV) power conversion system with a prominent implementation...
In microgrids, photovoltaic (PV) and storage are integrated as a droop-controlled ideal source, which is not practical and challenges the system efficiency. Instead, PV-storage can be allocated separately. This PV-storage independent system is more flexible and easier to optimize. But, the conventional PQ-controlled PVs rely on master voltage-controlled storage sources. In this paper, a novel operation...
Energy generation via Photovoltaic (PV) technologies has increased in the last years. Large scale PV generation have attracted interest among countries due to low operation cost and wide PV resource disposition. However, some operative challenges in large scale PV plants had been detected: power imbalance, low power quality in terms of total harmonic distortion (THD), power factor and conversion efficiency,...
In central inverter based photovoltaic (PV) plants, critical functions such as maximum power point tracking (MPPT) are performed on the aggregate I–V curve of all of the PV modules. The disadvantage of this approach is its inability to optimize overall output power when the operating conditions vary from one PV module to another, due to module differences (e.g. mismatch, layout, …) and shading effects...
A four switch, low power, battery integrated, photovoltaic stand-alone inverter system is proposed in this paper. The proposed topology is derived by combining a DC-DC bidirectional converter with a Ćuk based inverter. The derived topology has a simple structure consisting of four switching devices and an isolation transformer. A simple integrated control strategy for maximum power point tracking...
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...
This paper presents a voltage source inverter in a single phase system for photovoltaic applications. The singlephase H-Bridge is augmented by an additional leg from which greater degree of freedom has been achieved in terms of modulation strategy. This new topology demonstrates the feasibility to avoid the double line frequency ripple, which commonly exists in single phase systems. Hence, the DC...
Electricity is the driving force in a country's economy and the developing world needs reliable low cost electricity for its rapid growth. In light of the challenges faced by these countries, we have proposed a low cost PV based back-up system for critical loads in low grid reliability regions. In addition, the system can also be used in remote places where no access to grid is available. The proposed...
This paper explores the possibility of connecting two Wind Turbine Generators (WTG) to the grid using a single three level inverter. In the proposed system the rectified output of one WTG is connected across the upper dc-link capacitor of a standard diode clamped three level inverter. Similarly the rectified output of the other WTG is connected across the lower capacitor. This particular combination...
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