Resonance Damping Methods of LCL Filter

The control challenges of LCL-type grid-connected inverter arise from the resonance problem. At the resonance frequency, the LCL filter resonance causes a sharp phase step down of −180° with a high resonance peak. This resonance peak would easily lead to system instability and should be damped. In this chapter, the resonance hazard resulted by the LCL filter is reviewed first, and then, the existing passive- and active-damping solutions are described systematically to reveal the relationship among them. Among the six basic passive-damping solutions, adding a resistor in parallel with capacitor shows the best damping performance, but it results in a high power loss. In order to avoid the power loss in the damping resistor, the active-damping solutions equivalent to a resistor in parallel with capacitor are derived, and the capacitor-current-feedback active damping is superior for its simple implementation and effectiveness. This chapter provides the basis for the study of the control techniques of LCL-type grid-connected inverter in the following chapters.

[1]  M. Liserre,et al.  Stability improvements of an LCL-filter based three-phase active rectifier , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[2]  Shaojun Xie,et al.  Synthesis of active damping for grid-connected inverters with an LCL filter , 2012, ECCE 2012.

[3]  Steffan Hansen,et al.  Investigation of Active Damping Approaches for PI-Based Current Control of Grid-Connected Pulse Width Modulation Converters With LCL Filters , 2010, IEEE Transactions on Industry Applications.

[4]  Weidong Xiao,et al.  Two Degrees of Freedom Active Damping Technique for $LCL$ Filter-Based Grid Connected PV Systems , 2014, IEEE Transactions on Industrial Electronics.

[5]  Frede Blaabjerg,et al.  Generalized Design of High Performance Shunt Active Power Filter With Output LCL Filter , 2012, IEEE Transactions on Industrial Electronics.

[6]  Shuai Jiang,et al.  Resonance Issues and Damping Techniques for Grid-Connected Inverters With Long Transmission Cable , 2014, IEEE Transactions on Power Electronics.

[7]  Marco Liserre,et al.  Grid-Filter Design for a Multimegawatt Medium-Voltage Voltage-Source Inverter , 2011, IEEE Transactions on Industrial Electronics.

[8]  J. W. Kolar,et al.  Optimal design of LCL harmonic filters for three-phase PFC rectifiers , 2011, IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society.

[9]  Shaojun Xie,et al.  Active Damping-Based Control for Grid-Connected $LCL$ -Filtered Inverter With Injected Grid Current Feedback Only , 2014, IEEE Transactions on Industrial Electronics.

[10]  Ming Cheng,et al.  Modeling, Analysis, and Design of Multifunction Grid-Interfaced Inverters With Output LCL Filter , 2014, IEEE Transactions on Power Electronics.

[11]  Xiaohu Zhou,et al.  High-Frequency Resonance Mitigation for Plug-In Hybrid Electric Vehicles’ Integration With a Wide Range of Grid Conditions , 2012, IEEE Transactions on Power Electronics.

[12]  Graham C. Goodwin,et al.  Control System Design , 2000 .

[13]  Yun Wei Li,et al.  Generalized Closed-Loop Control Schemes with Embedded Virtual Impedances for Voltage Source Converters with LC or LCL Filters , 2012, IEEE Transactions on Power Electronics.

[14]  Marco Liserre,et al.  Filter-Based Active Damping of Voltage Source Converters With $LCL$ Filter , 2011, IEEE Transactions on Industrial Electronics.

[15]  M. Liserre,et al.  Stability of photovoltaic and wind turbine grid-connected inverters for a large set of grid impedance values , 2006, IEEE Transactions on Power Electronics.

[16]  Xiaowei Fu,et al.  Direct Grid Current Control of LCL-Filtered Grid-Connected Inverter Mitigating Grid Voltage Disturbance , 2014, IEEE Transactions on Power Electronics.

[17]  M. Liserre,et al.  Analysis of the Passive Damping Losses in LCL-Filter-Based Grid Converters , 2013, IEEE Transactions on Power Electronics.

[18]  M. Liserre,et al.  Design and control of an LCL-filter based three-phase active rectifier , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[19]  M. Liserre,et al.  Grid Impedance Estimation via Excitation of $LCL$ -Filter Resonance , 2007, IEEE Transactions on Industry Applications.

[20]  Zhihong Ye,et al.  Output filter design for a grid-interconnected three-phase inverter , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..