Soft Switching Inverter MATLAB — Simulation & Power Modeling

Abstract — Soft Switching Inverter MATLAB

High Frequency-Link (HFL) Inverters have been employed to integrate renewable energy sources into utility grids and electric vehicles. The soft-switching range of High-Frequency Link Inverters (HFLI) is increased using auxiliary inductors and capacitors. The application of auxiliary components increases the conduction loss and the complexity of the circuit. The literature indicates that the existing soft-switching methods suffer from higher duty cycle loss, voltage spikes, and lower efficiency owing to the resonance between the parasitic capacitance of switches and the leakage inductance of the transformer. Therefore, it is imperative to develop a modulation strategy that can improve the efficiency of HFLI. In this context, the proposed study develops a cycloconverter-type High-Frequency Link Inverter (CHFLI) based on a Bipolar Phase Shift Modulation (BPSM) strategy without the use of auxiliary components. The proposed modulation strategy enables the semiconductor switches to operate under zero voltage switching. The full-bridge inverter and Full Bridge Active Clamper Circuit (FBAC) switches operate at the same gating signals with a constant duty cycle of 50%. The proposed topology uses built-in magnetizing inductance to achieve zero voltage switching and reduce the duty cycle loss. The leakage energy is recycled from the output filter inductor to the load side using the FBAC. The results indicate that the proposed modulation strategy achieves ZVS and simultaneously achieves an efficiency of 95%. The proposed modulation strategy is easy to implement and does not require complex circuitry.

Analytical & State-Space Control Methodology

Growing concerns over environmental issues and diminishing fossil fuels have stimulated the progress of Renewable Energy Resources (RES), such as photovoltaics, wind, and fuel cells. This development has attracted the attention of utilities worldwide, leading to a greater integration of RES into the utility grid. However, this integration necessitates the use of grid-tied inverters ( Faranda et al., 2015 ; Pinto et al., 2016 ; Iyer et al., 2017 ; Meng et al., 2017 ). The most recent developments in inverters lack performance, efficiency, and power density ( Qinglin et al., 2005 ). Inverters with line-frequency isolation transformers as depicted in Figure 1 , are common in conventional utility grids. Therefore, this approach increases the inverters’ size, volume, and cost, which in turn jeopardizes the power density and efficiency.

Simulink Waveforms & Power Quality Findings

Figure 2: Power Converter Circuit Schematic & Electrical Interfacing for Soft Switching Inverter Matlab Inverters that employ HFL are designed to incorporate High-Frequency Transformers (HFT) for isolation. This arrangement offers advantages, such as reduced weight, smaller volume, higher power density, miniaturization, lower cost, excellent reliability, and improved efficiency, as highlighted in ( Guo et al., 2018 ; Nayak et al., 2019 ; Wu et al., 2023 ). In addition to RES, HFL inverters have been extensively utilized in compact power conversion-based modules for applications in naval, space, and energy storage systems ( Mazumder and Rathore, 2011 ). HFLI inverters are categorized into three groups based on their power conversion stages and circuit structures. The first structure is the conventional HFL inverter, which comprises three steps that insert an HFT between the DC/AC and AC/DC stages as given in Table 1 , the configuration I. Conventional HFL inverters typically have three power conversion stages, resulting in reduced efficiency and increased inverter size owing to a bulky intermediate LC filter with high cost ( Kan et al., 2014 ; Zhu et al., 2014 ; Zhou et al., 2018 ). The conventional inverter design has been modified to reduce both the size and cost; this modification involves the removal of the intermediate LC filter, which is typically bulky and costly. The alternative is given in Table 1 , with configuration II, and is referred to as a rectifier-type high-frequency link (RHFL) inverter ( Guo et al., 2018 ; Chen et al., 2016a ).

Scope & Practical Applications

• High-efficiency DC-DC converters and isolated resonant topologies (LLC / DAB)
• Sinusoidal and Space Vector PWM inverters for grid integration & industrial motor drives
• MOSFET / IGBT gate driver optimization with active Miller-clamp shoot-through protection
• Power quality conditioning with Total Harmonic Distortion (THD) strictly compliant with IEEE 519
• Complete Simscape .SLX model files, parameter calculation scripts, and IEEE dissertation reports