High-Frequency Soft-Switching Transformerless Grid-Connected Inverters

Description

This book is essential and valuable reference for graduate students and academics majored in power electronics, engineers engaged in developing distributed grid-connected inverters, and senior undergraduate students majored in electrical engineering and automation engineering. Soft-switching (SS) technique is an important way to achieve high conversion efficiency and high switching frequency for power converters, which is beneficial to improve power density and reduce volume and cost of power electronics equipment. This book mainly discusses SS technique for transformerless grid-connected inverters (TLIs), and a SS configuration named as “Freewheeling-Resonance-Tank Inverters” is proposed for TLIs fulfilling requirements of switching loss-free, full power factor range, and constant common-mode voltage performance. The detailed theoretical analysis and experimental validations are presented from ZCT and ZVT type topologies, respectively.  Contents 1 Introduction 1.1 Development History of Soft-Switching Inverters 1.2 Resonant DC-Link Inverters 1.2.1 Origin and Configuration of RDCLI 1.2.2 Conventional RDCLI 1.2.3 Actively Clamped RDCLI 1.2.4 Parallel RDCLI 1.3 Resonant Pole Inverters 1.3.1 Origin and Configuration of RPI 1.3.2 Conventional RPI 1.3.3 Auxiliary Resonant Commutated Pole Inverter 1.4 Freewheeling Resonance Tank Inverters 1.4.1 FRTI with Single-Quadrant Resonance Networks 1.4.2 FRTI with Two-Quadrant Resonance Networks References 2 High-Frequency Transformerless Grid-Connected Inverters and Related Issues 2.1 High-Frequency Operation Requirements for TLIs 2.1.1 High Power Density and Low Volume 2.1.2 Low Cost 2.1.3 High Performance 2.2 Switching Loss Issue 2.2.1 Origin of Switching Loss 2.2.2 Semiconductor Related Solutions 2.2.3 Circuit Related Solutions 2.3 EMI Issue 2.4 Reactive Power Issue References 3 Zero-Current-Transition TLIs with Switching-Loss-Free 3.1 ZCT Trajectory and Implementing Cells with Self-compensation Mode 3.2 SLF-H6 Inverter 3.2.1 Derivation of SLF-H6 Topology 3.2.2 Operation Principle 3.2.3 Conditions for Achieving SLF-H6 3.2.4 Parameter Design of Resonant Components 3.2.5 Experimental Verification 3.3 SLF-HERIC Inverter 3.3.1 Derivation of SLF-HERIC Topology 3.3.2 Operation Principle 3.3.3 Conditions for Achieving SLF-HERIC 3.3.4 Experimental Verification References 4 Zero-Current-Transition TLIs with Full Power Factor Range 4.1 Two-Quadrant ZCT Resonance Network 4.1.1 Implementing Cells of ZCT Trajectory with Load-Related Radius 4.1.2 Derivation of TQ-ZCT-RN 4.2 SLF-HERIC-FPF Inverter 4.2.1 Application of TQ-ZCT-RN in HERIC Topology 4.2.2 Operation Principle 4.2.3 Performance Analysis 4.2.4 Experimental Verification 4.3 SLF-H6-FPF Inverter 4.3.1 Application of TQ-ZCT-RN in H6 Topology 4.3.2 Operation Principle 4.3.3 Experimental Verification 4.4 ZCT-H5-FPF Inverter 4.4.1 Application of TQ-ZCT-RN in H5 Topology 4.4.2 Operation Principle 4.4.3 Experimental Verification References 5 Zero-Voltage-Transition TLIs with Single-Quadrant Resonance Networks 5.1 ZVT Trajectory and Implementation Cells 5.2 ZVT-HERIC Inverter 5.2.1 Derivation of ZVT-HERIC Topology 5.2.2 Operation Principle 5.2.3 Conditions for Achieving ZVT 5.2.4 Parameter Design of Resonant Components 5.2.5 Experimental Verification 5.3 ZVT-H5 Inverter 5.3.1 Derivation of ZVT-H5 Topology 5.3.2 Operation Principle 5.3.3 Experimental Verification 5.4 ZVT-H6 Inverter 5.4.1 Derivation of ZVT-H6 Topology 5.4.2 Operation Principle 5.4.3 Experimental Verification References 6 Zero-Voltage-Transition TLIs with Two-Quadrant Resonance Networks 6.1 Two-Quadrant ZVT Resonance Networks 6.1.1 New Equivalent Structure of ZVT Cells 6.1.2 Derivation of TQ-ZVT-RN 6.2 ZVT-HERIC-FPF Inverter 6.2.1 Application of TQ-ZVT-RN in HERIC Topology 6.2.2 Operation Principle 6.2.3 Performance Analysis 6.2.4 Experimental Verification 6.3 ZVT-H6-FPF Inverter 6.3.1 Application of TQ-ZVT-RN in H6 Topology 6.3.2 Operation Principle 6.3.3 Experimental Verification References