研究目的
Investigating the fault-tolerant operation of grid-tied PV fed Cascaded H-Bridge (CHB) converters, focusing on balancing grid currents and extending reactive power capability during post-fault conditions.
研究成果
The proposed zero sequence voltage injection technique and PWM clamping strategy effectively balance grid currents and extend the reactive power capability of CHB converters during post-fault conditions. The methods prevent over modulation and ensure equal active and reactive power flow in each phase, as validated through simulation and experimental results.
研究不足
The study focuses on the operation of CHB converters with faulty cells and the extension of reactive power capability, but it may not cover all possible fault scenarios or the impact of varying grid conditions.
1：Experimental Design and Method Selection:
The study employs a novel zero sequence voltage injection technique and a new PWM clamping strategy to balance grid currents and prevent over modulation in each cell of the converter.
2：Sample Selection and Data Sources:
Simulation and experimental results are used to validate the proposed concepts.
3：List of Experimental Equipment and Materials:
A laboratory setup including a three-phase grid-connected seven-level cascaded H-bridge converter, TMS320F28335 Delfino microcontroller, and Max 10 FPGA controller.
4：Experimental Procedures and Operational Workflow:
The converter's operation is analyzed during pre-fault and post-fault conditions, with and without the proposed PWM clamping strategy.
5：Data Analysis Methods:
The performance is evaluated based on the balance of grid currents and the extension of reactive power capability.
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