Abstract
In this article, a modified single-phase five-level photovoltaic inverter is proposed with a single DC voltage source and six semiconductor switches. Compared with the presented inverters, the introduced topology has the advantage of decreased device count and the first switching frequency for high blocking voltage switches. The proposed PV inverter is implemented without clamping diodes and transformers, which leads to a decrement in size and, consequently, the weight of the converter. In addition, for the proposed topology, space vector pulse width modulation (SVPWM) is deployed that reduces the complexity of multilevel modulation. In order to obtain the optimal output voltage of the inverter, the deadbeat controller is suggested as a rapid dynamic, low-computation digital control method. This closed-loop inverter is implemented in TMS320f28335 digital signal controller to evaluate the performance of the proposed inverter under nonlinear and linear loads. Simulation and laboratory prototype results show that IEC 62040-3 harmonic constraints is met for the proposed photovoltaic inverter in standalone applications.
Highlights
Increased greenhouse gas emissions have led to the development of renewable energy
Few works have been published space vector pulse width modulation (SVPWM) algorithm for single-phase Multilevel inverters (MLI), and this method is often used for threephase inverters [9]
The PWM method is changed into phase shift (PS-PWM) and level shift (LS-PWM) techniques, and in any MLI has many impacts on the voltage balancing in capacitors and THD of the inverters [8]
Summary
Increased greenhouse gas emissions have led to the development of renewable energy. In recent years, a large number of zero fossil fuel energy buildings were built in the world that uses renewable energy as a source of whole energy. Multilevel renewable energy inverters have presented to increase efficiency and reduce the space and weight of converters [1]. MLI have several advantages over conventional two-level inverters Some of these advantages include generating the voltage with low harmonic distortion, reducing the dv/dt stress on the semiconductor switches, decreasing switch failure rate, increasing reliability, improving electromagnetic compatibility, and improving common-mode voltage. The principal advantage of the NPC inverter is the low switching frequency, while its weakness is the uneven distribution of thermal losses in semiconductors.
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