研究目的
To address the imbalance among the output voltages of submodules (SMs) in DC–DC converters for the medium-voltage direct current (MVDC) grid interface of photovoltaic (PV) systems caused by the mis-matched power of PV arrays.
研究成果
The proposed VB-based multi-port cascaded converter with a novel power feedforward voltage-balancing control effectively addresses the voltage imbalance issue in MVDC grid interfaces of PV systems. The converter demonstrates excellent voltage-balancing capacity and dynamic performance, as verified by simulation and experimental results.
研究不足
The study focuses on the voltage-balancing aspect of cascaded DC–DC converters for PV systems. The limitations include the scalability of the VB-based approach for systems with a large number of SMs and the efficiency under extreme power mismatch conditions.
1：Experimental Design and Method Selection:
A multi-port cascaded DC–DC converter based on a voltage balancer (VB) with a novel power feedforward voltage-balancing control strategy was designed. The methodology includes theoretical models and algorithms for voltage balancing.
2：Sample Selection and Data Sources:
The study uses PV arrays as input sources and a MVDC grid as the output. The selection criteria focus on the power mismatch scenarios in PV systems.
3：List of Experimental Equipment and Materials:
The setup includes LLC resonant converters as SMs, VBs for power regulation, and various passive components like inductors and capacitors.
4：Experimental Procedures and Operational Workflow:
The process involves setting up the converter, applying MPPT control to the LLC converters, and implementing the power feedforward voltage-balancing control to regulate the differential power among SMs.
5：Data Analysis Methods:
The performance was evaluated through simulation in MATLAB/SIMULINK and experimental verification on a small-scale prototype, analyzing voltage-balancing capacity and dynamic performance.
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