Preface; Acknowledgements; Contents; About the Authors; Abbreviations; 1 Introduction; Abstract; 1.1 Energy Situation and Environmental Issues; 1.2 Renewable Energy-Based Distributed Power Generation System; 1.3 Key Issues of LCL-Type Grid-Connected Inverters; 1.3.1 Design and Magnetic Integration of LCL Filter; 1.3.2 Resonance Damping Methods of LCL Filter; 1.3.3 Controller Design of Grid-Connected Inverters; 1.3.3.1 Classification of Control Schemes; 1.3.3.2 Closed-Loop Design Targets; 1.3.3.3 Grid Current Regulator; 1.3.4 Effects of Control Delay and the Compensation Methods

1.3.4.1 Control Delay Effects1.3.4.2 Control Delay Compensation Methods; 1.3.5 Suppression of Grid Current Distortion Caused by Grid Voltage Harmonics; 1.3.5.1 Suppression of Grid Current Distortion and Unbalance Caused by Grid Voltage; 1.3.5.2 Suppression of the Grid Current Reference Error; 1.3.6 Grid-Impedance Effects on System Stability and the Improvement Methods; 1.4 Summary; References; 2 Design of LCL Filter; Abstract; 2.1 PWM for Single-Phase Full-Bridge Grid-Connected Inverter; 2.1.1 Bipolar SPWM; 2.1.2 Unipolar SPWM; 2.2 PWM for Three-Phase Grid-Connected Inverter; 2.2.1 SPWM

2.2.2 Harmonic Injection SPWM Control2.3 LCL Filter Design; 2.3.1 Design of the Inverter-Side Inductor; 2.3.1.1 Single-Phase Full Bridge Grid-Connected Inverter; 2.3.1.2 Three-Phase Grid-Connected Inverter; 2.3.2 Filter Capacitor Design; 2.3.3 Grid-Side Inductor Design; 2.4 Design Examples for LCL Filter; 2.4.1 Single-Phase LCL Filter; 2.4.2 Three-Phase LCL Filter; 2.5 Summary; References; 3 Magnetic Integration of LCL Filters; Abstract; 3.1 Magnetic Integration of LCL Filters; 3.1.1 Magnetic Integration of Single-Phase LCL Filter; 3.1.2 Magnetic Integration of Three-Phase LCL Filter

3.2 Coupling Effect on Attenuating Ability of LCL Filter3.2.1 Magnetic Circuit of Integrated Inductors; 3.2.2 Characteristics of LCL Filter with Coupled Inductors; 3.3 Design Examples; 3.3.1 Magnetics Design for Single-Phase LCL Filter; 3.3.2 Magnetics Design for Three-Phase LCL Filter; 3.4 Experimental Verification; 3.4.1 Experimental Results for Single-Phase LCL Filter; 3.4.2 Experimental Results for Three-Phase LCL Filter; 3.5 Summary; References; 4 Resonance Damping Methods of LCL Filter; Abstract; 4.1 Resonance Hazard of LCL Filter; 4.2 Passive-Damping Solutions

4.2.1 Basic Passive Damping4.2.2 Improved Passive Damping; 4.3 Active-Damping Solutions; 4.3.1 State-Variable-Feedback Active Damping; 4.3.2 Notch-Filter-Based Active Damping; 4.4 Summary; References; 5 Controller Design for LCL-Type Grid-Connected Inverter with Capacitor-Current-Feedback Active-Damping; Abstract; 5.1 Modeling LCL-Type Grid-Connected Inverter; 5.2 Frequency Responses of Capacitor-Current-Feedback Active-Damping and PI Regulator; 5.3 Constraints for Controller Parameters; 5.3.1 Requirement of Steady-State Error