Abstract
This paper introduces a new three-phase two-level inverter based on the switched-capacitor voltage multiplier. By adding a voltage multiplier network at the DC side of the traditional three-phase inverter topology, the DC-link voltage of the introduced inverter is stepped up to triple of the input voltage. Compared to the existing solutions, the common-mode voltage of the introduced topology is kept constant. Moreover, the voltage stress across additional semiconductor components is the same as one-third of DC-link voltage. Operating principles, mathematical analysis, circuit analysis, and pulse-width modulation (PWM) method based on the Boolean logic function for introduced inverter are presented. A comparison of the introduced inverter with other inverter topologies is also reported. The simulation results are shown to verify the introduced three-phase triple voltage boost inverter. Besides that, a laboratory-built prototype is developed based on a DSP F280049C microcontroller and the corresponding experimental tests are provided to prove the introduced inverter.
Highlights
In the recent period, transformerless grid-connected photovoltaic (PV) inverters have been receiving more and more attention from many researchers due to their inherent benefits of small size and volume, less complexity, high efficiency, low cost, and easy to install [1], [2]
The ground and PV array through the parasitic capacitor, which causes a variety of unwanted problems such as serious electromagnetic interference (EMI) and insecurity, higher losses, higher current harmonics, and the low reliability of the transformerless grid-connected PV inverter systems [3]–[5]
SIMULATION RESULTS To confirm the performance and operating principle of the proposed constant commonmode voltage inverter (CCMVI) topology, the simulation model is established in PLECS simulation platform, and simulation results are given
Summary
Transformerless grid-connected photovoltaic (PV) inverters have been receiving more and more attention from many researchers due to their inherent benefits of small size and volume, less complexity, high efficiency, low cost, and easy to install [1], [2]. Similar to the conventional VSI under discontinuous PWM strategy, the proposed CCMVI topology under the proposed PWM control technique has the major features such as low switching losses, full modulation range, and low DC-link current ripple. The CMV of the introduced CCMVI is zero while that of the conventional VSI under different PWM schemes in [8]–[11] is 33% of DC-link voltage This variation of the ESI topology in [22] and the ZVR topology in [25] is zero. Like four-leg inverter topology in [20], voltage stress across filter inductor in the conventional VSI under different PWM schemes in [8]–[11] and SCVD topology under NSPWM in [28] is double of DC-link voltage
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
