±35 kV/500 kW DC Grid-Connected High-Frequency Resonant Converter for PV Power Generation

Chapter 5 presents a detailed magnetic flux density (MFD) analysis and proposes an asymmetric pulse frequency modulation (APFM) with constant on time to effectively control the maximum MFD of the converter. In the MVDC collection scheme for new energy power generation, the input and output voltages are relatively stable when the small voltage fluctuations are not taken into account, and the thermal design of semiconductors and the development of high-power high-frequency transformers are two key research objects. In this chapter, a DCM-SRC-based ±35 kV/500 kW DC grid-connected converter for PV power generation will be systematically studied, including the design and selection of key parameters, the thermal design of switches, and the optimal design of high-frequency transformer. Furthermore, the parallel coordination control between two 250 kW converters is presented and the relevant test experiments are carried out.