Abstract
The solar power generation system with minimal losses, high simplicity and easy control is attempted in this work , by developing a grid-tied zero-voltage switching ( ZVS) inverter with a less number of power conversion stages and the least count of passive components, for single-phase applications that are suitable for conversion from low-voltage DC (40-60 V) to line voltage AC ( 230 VAC; RMS) at average power levels of 175 W and below. The ZVS full-bridge inverter fed from a PV panel is working on higher frequency with an asymmetric auxiliary circuit , which guarantees ZVS at the switching instants of the metal-oxide-semiconductor field-effect transistors (MOSFETs) by supplying the reactive current to these full-bridge semiconductor switches and reducing the switching losses. Checking of the constructional workability and analytical feasibility of the proposed topology with the highest efficiency and the simplest control was the target of this work, which was set on the basis of the results obtained in the MATLAB Simulink environment. The control strategies were planned for the optimum value of the reactive current injected by the auxiliary circuit to guarantee ZVS and use of phase shifted pulsewidth modulation (PWM) with varying frequencies for the full-bridge inverter and half-bridge cyclo-converter. The hybrid maximum power point tracking (MPPT) was part of this plan used to set the power at its maximum value against the environmental changes. Citation: Deshbhratar, R. G., and Renge, M. M. (2018). Analysis and Design of Solar Power System Interface Utility Using ZVS Converter. Trends in Renewable Energy, 4, 83-101. DOI: 10.17737/tre.2018.4.3.0052
Highlights
The achievable efficiency, 98.73% found as a result of zerovoltage switching (ZVS) operated H-bridge inverter, is well above the inverter topologies used and reported in some papers [23, 24, 26, 27]
This is possible only due to the fact that, the reactive current is controlled and made sufficient for the loss-less switching of all the switches used in this topology
This paper introduces a microinverter for single-phase PV applications, which is suitable for conversion from low-voltage (35-50 V) direct current (DC) to high voltage alternating current (AC) (e.g., 230 Vrms AC)
Summary
The main duty of the inverter is to convert the photovoltaic direct current (DC) power into grid-synchronized alternating current (AC) output. It may be central inverters, mini central inverters, string inverters, multi-string inverters, and microinverters [1, 2], according to the type of inverter topology. Among these inverter topologies, the microinverter is widely used, as it is suitable for integrating a single solar panel (40–400 W) to the grid. The inverter topology has a great role in deciding the cost
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