A Three-Input Central Capacitor Converter for a High-Voltage PV System

Abstract

High-voltage photovoltaic (PV) techniques have their own advantages in PV plants for reducing the construction cost and improving the operational efficiency. However, the high input PV voltage increases the mismatch losses of PV arrays, which is also a key factor that influences the energy yield of PV plants. This paper proposes a three-input central capacitor (TICC) dc/dc converter for a high-voltage PV system, where four low-rating cascaded buck-boost converters connect to the series-connected three low-voltage PV arrays and two capacitors and realize the maximum power point tracking independently. Meanwhile, there is a neutral point in the proposed converter, enabling it to be connected with the rear-end three-level inverter directly. It can also help balance the three-level dc-link voltage by properly regulating the transferred energy among three input sources. Compared with other transformer-less dc-dc converters, the proposed converter is able to reduce the semiconductor voltage/current stress and therefore achieve the high efficiency. Simulation and experimental results verified the performance of the proposed TICC converter.

The Empirical Analysis, Mathematical Modeling, and Advanced Control Strategies for Buck Converter

“…There is another wellknown converter known as the capacitor converter, which is used frequently in high-voltage processing. The reason for frequency use is their unique feature of utilizing three different input voltages [58]. This unique feature distinguishes it from the other capacitors explained earlier.…”

HIL real-time simulator based 3D-space vector pulse width modulation for performance analysis of 3-phase matrix converter

“…It requires more power semiconductor switches for MC design compared to traditional rectifier-inverter pair circuits. Firstly 3-phase to 3-phase MC is introduced and modulated by Alesina and Venturini; then, later on, various modified circuits are designed and controlled by various PWM schemes (Meng et al, 2022). Generally, different PWM strategies were developed to control the power devices located in altered power converter circuits (Tekwani et al, 2009;Palanisamy et al, 2021).…”