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A new circuit topology, Multi-DC Tap, in which several switching devices with anti-parallel diodes are connected in series to enable several arbitrary DC terminal voltages from a common DC link, is proposed. The control switching pattern for the Multi-DC Tap is investigated based on the direction of each terminal current and its buck/boost operation conditions. As a result, a simple strategy for switching...
This paper presents a single-phase grid connected inverter with a power decoupling circuit. In the single-phase grid connected inverter, it is well known that a power pulsation with twice the grid frequency is contained in the input power. In a conventional inverter, electrolytic capacitors with large capacitance have been used in order to smooth the DC voltage. However, lifetime of those capacitors...
In this paper, the techniques for a gradationally controlled voltage inverter (GCVI), which is a high efficiency inverter, and a high efficiency power conditioner utilizing the GCVI technique for photovoltaic power generation systems are described. A GCVI consists of several inverters operated at different voltages in series and outputs voltage with a sine waveform by combining these outputs. The...
In this paper, a soft switching interleaved boost converter for photovoltaic power generation system is proposed. It is a topology, which raises efficiency for DC-DC converter of photovoltaic PCS(Power Conditioning System). And it minimizes switching losses, input current ripple and output voltage ripple by adopting soft switching method using resonance. The detailed mode analysis of proposed topology...
This paper presents design considerations for grid connected photovoltaic inverters intended for use in industrial and commercial applications. Important aspects such as efficiency, reliability, construction constraints, control, standards and grid codes compliance are discussed. On the other hand, characteristics of a 600 V system based on Japanese standards and a 900 V system based on IEC standards...
In this paper, a battery-integrated boost converter for module-based series connected photovoltaic (PV) system is analyzed. Each PV module has its own battery and DC/DC converter. The converter achieves maximum power point tracking (MPPT) and battery charging. Application of proposed converter to module-based series connected PV system can maintain string voltage and save an additional voltage amplification...
This paper deals with the parallel connection of photovoltaic inverters in a large scale photovoltaic generation system. 250 kW grid-connected LCL inverters are evaluated in order to achieve parallel operation of two, three, and four units, reaching a total capacity of 1 MW when four units are operating. The concept is to treat these four parallel connected units as one equipment, being able to operate...
In this paper, according to power sharing algorithm and types (2 Con & 2 Inv, 2 Con & 1 Inv, 1 Con & 1 Inv) of photovoltaic (PV) and fuel cell (FC) hybrid generation system, control algorithms of converter and inverter are presented. Almost algorithms of PV and FC hybrid generation system are performed and verified to use by technology for commercialization. Moreover, a comparative study...
A novel high efficiency Current-Shared Photovoltaic Power System (CS-PPS), mainly constructed by the Maximum Power Point Tracking and Power Conditioning System (MPPT-PC), is proposed in this paper. The proposed MPPT-PC can track the MPPT and regulate the load energy condition at the same time for increasing the circuit efficiency and providing stable power to critical loads. A 200W prototype is designed...
This paper presents a flyback inverter using voltage sensorless maximum power point tracking (MPPT) for AC module systems. In conventional MPPT technique, a PV voltage and PV current are required to calculate the PV output power for the MPPT operation. A proposed method only used for the PV current detection sensor to perform MPPT. When the PV current is sensed, proposed method calculates the electric...
It has been demonstrated that performing localized maximum peak power tracking (MPPT) on each photovoltaic (PV) panel, instead of using a single MPPT controller across the PV string can substantially increase the total harvested power, since each panel experiences unique illumination and temperature conditions. In this work, the effect of the dc-dc converter efficiency on the power savings from distributed...
The operation plan of a solid-oxide fuel cell (SOFC) and a proton -exchange membrane fuel cell (PEFC) with time shift utilization of the SOFC exhaust heat is developed. The proposed system in this paper consists of a SOFC-PEFC combined system and a photovoltaic system as the energy supply to a micro grid of 30 residences in Sapporo, Japan. The operation plan of the system has three cases: without...
Simultaneous dropout of a large amount of distributed generators caused by a fault in a power line with voltage drop and/or phase change may worsen power stability of a trunk power system. A reduced model of distributed generators in secondary systems considering partial dropout is proposed for the stability analyses. To verify the reduced model, a detailed model and the proposed reduced model are...
High efficiency is one of the most important requirements for grid-connected photovoltaic (PV) systems. Power compensating concept promises high efficiency maximum power point (MPP) tracking and hence improves the efficiency of the whole PV systems. In this paper, the compensating concept in grid-connected PV systems with kinds of power architectures was summarized. It was found that even with the...
A renewable energy hybrid power plant, fed by photovoltaic (PV) and fuel cell (FC) sources with a supercapacitor storage device and suitable for distributed generation applications, is proposed herein. The PV is used as the main generator; the FC acts as a power source, feeding only the insufficiency power (steady-state) from the PV; and the supercapacitor functions as an auxiliary source for supplying...
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