Abstract
Inverter systems that feed electrical power from photovoltaic (PV) system into the grid must convert the direct current of the PV array into the alternating current of the grid. In many applications, it is important for a converter to be lightweight, highly reliable, input/output isolated, flexible and operable in a boost mode. These features can be achieved by using a High-Frequency inverter which involves an isolated DC-DC stage and DC-AC section, which provides AC output. This paper proposes a new three phase topology, based on multi stage converter and PV system in order to use in medium and high power applications. The Perturb and Observe (P&O) method is used for maximum power point tracking (MPPT) control of PV array. The switching control signals for three-phase inverter are provided by hysteresis control method. Also, the comparison between the proposed topology and traditional structures has been conducted and finally the simulation researches are performed in a closed-loop control system by MATLAB/Simulink software to verify the operation of the proposed structure. The results represent better performance of the introduced system over traditional topologies.
Highlights
As available amount of fossil fuels in the world is decreasing and on the other hand their negative effects on the environment are completely obvious to everyone, applications of the renewable energy sources are gaining more traction continuously
This paper proposes a Current-Source Inverter (CSI) for the DC-AC section due to its operation in boost mode and growing up the flexibility of the converter
The 240kW resistive load is simultaneously connected to the grid and PV system
Summary
As available amount of fossil fuels in the world is decreasing and on the other hand their negative effects on the environment are completely obvious to everyone, applications of the renewable energy sources are gaining more traction continuously. The second full-bridge inverter generates an AC voltage, which is smoothed to a sinusoidal line frequency AC voltage and fed into the main grid [5,6]. The benefits of this topology can be written as follows: Compact and light, due to the small dimensions and less weight of HF transformer High degree of efficiency through reduction of transformer losses More degree of safety because of galvanic isolation between the DC and AC sides Suitable for all module technologies, as module grounding (positive and negative) is possible Achieving high voltage gain.
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