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An improved modulation algorithm is proposed for three-phase face-to-face topology. The algorithm could make the face-to-face dc transformer use 1: 1 ac transformer or omit ac transformer in a wide variable ratio range to reducing the volume of the system. The simulation in MATLAB/Simulink validates the proposed algorithm.
Recent research on high voltage and power DC/DC converter mainly focus on the face-to-face topology based on modular multilevel converters (MMC). The topology consists of two MMC which are coupled by a transformer. It is easy to extend the module number according to the voltage level. However, the present modulation method in this topology cannot regulate the voltage transformation ratio on two dc...
Several topologies of high voltage input DC/DC power supply are investigated firstly in this paper and then a novel gate control strategy for cascade SiC MOSFET stack using a single standard gate driver is proposed. Thereafter, operation principles including both static sate and switching transitions are analyzed. The LTspice simulation results validate the analysis and show the availability of the...
Residential PV systems always suffer from a power loss that results in poor performance due to a mismatched case under real conditions. Addressing and minimizing the power loss of the PV system under such conditions is critical to improving PV system efficiency in residential use. Power electronics for photovoltaic systems have also evolved rapidly in such background, the trend moves towards distributed...
With the rapid development of renewable energy systems and Microgrid, more and more DC grids of different voltage level need to be connected by the high voltage and high power DC-DC converter. The traditional topology of high voltage and high power DC-DC converter was Phase Shifted Full Bridge cascaded Modules (PSFBM). Due to the inefficiency and difficulty on manufacturing high frequency transformer...
This paper addresses the power loss issue results from mismatch case which is critical to improving overall efficiency of the residential PV system. In general, a dedicated DC-DC converter with an extra distributed MPPT (Max Power Point Tracking) algorithm, what is called a MIMC (Module Integrated MPPT Converter), is connected to each panel to reduce the mismatch impact. However, even by adopting...
In this paper, a novel high-capacity grid-connected photovoltaic (PV) system based on Boost converter + dual-level four-leg inverter is proposed, which can perform both grid-connected system and active power filter (APF). Comparing with single-stage three-phase three-wire PV system, the proposed system not only allows a wide range of input voltage, but also can compensate unbalance loads current....
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