A new transformer‐less common grounded five‐level grid‐tied inverter with leakage current elimination and voltage boosting capability for photovoltaic applications

Abstract

Due to serious Concerns such as air pollution, global warming, and fossil fuels shortcoming, renewable energy sources such as photovoltaic applications are dramatically being integrated into the power generation systems all of the world. Here, a new switched‐capacitor‐based transformer‐less grid‐tied inverter has been proposed. By applying the series–parallel switching technique of the utilized switched‐capacitor module, the voltage boosting capability has been obtained. By implementing common ground technique, high overall efficiency and leakage current elimination capability have been obtained. Since the proposed inverter provides a multi‐level output voltage, the total harmonic distortion of the injected grid current is reduced. The introduced control strategy has been implemented to control both active and reactive powers and generate the switches pulses. Therefore, a high quality and adjusted current is injected to the grid. This inverter requires a single renewable energy source as input DC source. Here, the comprehensive description of the proposed inverter and its performance with design considerations have been presented. The proposed structure has been compared with several similar structures and the obtained results have been investigated. To evaluate the performance of the proposed inverter, a 620 W laboratory prototype is assembled and experimental results are analyzed.

A New High Step-Up SC-Based Grid-Tied Inverter With Limited Charging Spike for RES Applications

“…The reliability analysis of converters provides a systematic approach for assessing the reliability of these complicated systems, which is important for assuring their safe and efficient operation in different applications. The reliability assessment of the proposed inverter in this article is performed using Markov Approach [4], which is a mathematical tool used to assess the probabilities of transitions between different states in a system over time. In case of multi-level inverters, the Markov chain refers to the possible states of the system, such as normal operation, partial failure, and complete failure, and the probabilities of transitions among these states as a result of component failures.…”

“…Multi-level inverters are promising solutions to enhance the performance of electric vehicles (EVs), PV systems, and other power electronic devices in medium-and high-power applications due to many advantages like requiring small size filter, low total harmonic distortion (THD), high efficiency, etc. [4,5].…”

Investigating the Effectiveness of PWM Control in Reducing Leakage Current in Transformerless Inverters for PV Systems

“…The inverter can match the frequency of the grid, which is commonly 50 or 60 Hz, by altering the frequency of the signal. PWM control is a strong approach for managing the power output of electronic equipment in general, and it is widely utilized in a wide range of applications, including PV systems [10].…”