This paper presents the design and simulation of a high step-up DC-DC converter employing a passive quadratic gain circuit integrated with a single active-switch boost topology for sustainable power source applications. The proposed quadratic network consists of a diode-inductor-capacitor configuration, connected at the input side of a conventional boost converter. The inductor in the passive gain circuit is periodically energized by the main active switch trough a diode, enabling higher voltage transfer and store at the intermediate capacitor. The stored voltage is subsequently step-up by the conventional boost stage, resulting in an overall quadratic voltage gain. The operating principle and steady state voltage gain characteristics of the proposed system are analyzed. Simulations are conducted to validate and evaluate the converter performances. The results demonstrate that the proposed topology achieves a significantly higher voltage gain compared to the conventional boost converter under identical duty cycles. The proposed passive quadratic converter provides advantages in terms of reduced complexity, lower cost, and improved suitability for renewable energy power systems.
Erpan Sahiri, Mochamad Ashari, H. Suryoatmojo· International Seminar on Int...· 0 citations
The rapid growth of electric vehicles and energy storage systems requires efficient two-way power conversion systems, such as bidirectional VSIs operating in Grid-to-Vehicle (G2V) and Vehicle-to-Grid (V2G) modes. Unfortunately, conventional Hysteresis Current Control (HCC) methods lead to unstable switching frequencies, degrading the system's power quality and performance. This study proposes a single-phase two-way Voltage Source Inverter (VSI) with a full bridge topology controlled by an Artificial Neural Network (ANN) based Adaptive Hysteresis Current Control (AHCC) scheme. ANN is used to define hysteresis bands adaptively to keep the switching frequency stable. The system consists of a two-way VSI connected to the grid and a two-way DC-DC converter that connects the battery via DC-Link. The simulation results showed that the proposed method produced a narrower instantaneous frequency switching range of 5.263 kHz-25 kHz compared to Fixed-HCC of 11,111kHz-50 kHz, so that AHCC-ANN produced an average frequency switching value of 13.37 kHz, close to the desired frequency switching of 15 kHz, while Fixed-HCC was 20,25 kHz. On the other hand, the% of THD for AHCC-ANN (2.72%) is lower than that for Fixed-HCC (3.2%). On the other hand, the DC-link voltage can also be maintained at 400 V during charging and discharging. These results show that AHCC with ANN can stabilize switching frequencies and DC-link voltages and support effective bidirectional power flow.
Ludviatul Amanah, F. Pamuji, Mochamad Ashari· International Seminar on Int...· 0 citations
