Robust High-Performance Inverter Control Using Discrete Direct-Design Pole Placement

A robust high-performance discrete controller, with a simple implementation and characterizable performance that lend it to high-power industrial applications, is proposed. Discrete direct-design pole placement allows the use of common design parameters such as damping ratio and bandwidth (BW) to define the controller's response. High performance is demonstrated with example systems achieving BWs twice as high as those of traditional cascaded current- and voltage-loop controllers. The controller is shown to be robust against component variations and many different load types, including low-impedance grid connections. Comparisons between the proposed controller and a discretized full-state-feedback continuous-time-derived controller are made and show significant improvements in both BW and stability margins. Practical tests on a parallel 2-MVA test system demonstrate a close correlation with the analysis, with an error of less than 1%.

[1]  Robert D. Lorenz,et al.  Control topology options for single-phase UPS inverters , 1996, Proceedings of International Conference on Power Electronics, Drives and Energy Systems for Industrial Growth.

[2]  H. Pinheiro,et al.  Design and Implementation of a Robust Current Controller for VSI Connected to the Grid Through an LCL Filter , 2009, IEEE Transactions on Power Electronics.

[3]  Lipei Huang,et al.  Distributed Parallel Operation of Modified Deadbeat Controlled UPS Inverters , 2007, 2007 IEEE Power Electronics Specialists Conference.

[4]  Shaojun Xie,et al.  Study on dual-loop grid current control scheme for grid-connected inverter with an LCL-filter , 2009, 2009 4th IEEE Conference on Industrial Electronics and Applications.

[5]  Yun Wei Li,et al.  Control and Resonance Damping of Voltage-Source and Current-Source Converters With $LC$ Filters , 2009, IEEE Transactions on Industrial Electronics.

[6]  Paolo Mattavelli,et al.  Uninterruptible power supply multiloop control employing digital predictive voltage and current regulators , 2001 .

[7]  H. Pinheiro,et al.  Stability analysis of grid-connected voltage source inverters with LCL-filters using partial state feedback , 2007, 2007 European Conference on Power Electronics and Applications.

[8]  M. A. Rodriguez,et al.  Second-order predictive direct control of a voltage source inverter coupled to an LC filter , 2008 .

[9]  Manfred Morari,et al.  Explicit Model-Predictive Control of a PWM Inverter With an LCL Filter , 2009, IEEE Transactions on Industrial Electronics.

[10]  Timothy C. Green,et al.  Control and filter design of three-phase inverters for high power quality grid connection , 2003 .

[11]  Paolo Mattavelli,et al.  An improved deadbeat control for UPS using disturbance observers , 2005, IEEE Transactions on Industrial Electronics.

[12]  Robert Turner,et al.  Stability and Bandwidth Implications of Digitally Controlled Grid-Connected Parallel Inverters , 2010, IEEE Transactions on Industrial Electronics.

[13]  Seung-Ki Sul,et al.  Compensation voltage control in dynamic voltage restorers by use of feed forward and state feedback scheme , 2005, IEEE Transactions on Power Electronics.

[14]  Poh Chiang Loh,et al.  A comparative analysis of multiloop voltage regulation strategies for single and three-phase UPS systems , 2003 .

[15]  P. Mattavelli,et al.  Predictive digital control of power factor preregulators with input voltage estimation using disturbance observers , 2005, IEEE Transactions on Power Electronics.

[16]  Donald Grahame Holmes,et al.  Grid current regulation of a three-phase voltage source inverter with an LCL input filter , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[17]  S. Y. Yang,et al.  Study on active damping methods for voltage source converter with LCL input filter , 2009, 2009 IEEE 6th International Power Electronics and Motion Control Conference.

[18]  Jan Melkebeek,et al.  Small-Signal $z$ -Domain Analysis of Digitally Controlled Converters , 2006 .

[19]  Christian Wessels,et al.  Limitations of Voltage-Oriented PI Current Control of Grid-Connected PWM Rectifiers With $LCL$ Filters , 2009, IEEE Transactions on Industrial Electronics.

[20]  S. Saggini,et al.  Digital Deadbeat Control Tuning for dc-dc Converters Using Error Correlation , 2006, IEEE Transactions on Power Electronics.

[21]  P.W. Lehn,et al.  Digital current control of a voltage source converter with active damping of LCL resonance , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[22]  Paolo Mattavelli,et al.  An Adaptive Control for UPS to Compensate Unbalance and Harmonic Distortion Using a Combined Capacitor/Load Current Sensing , 2007, IEEE Transactions on Industrial Electronics.

[23]  Robert D. Lorenz,et al.  A high performance sine wave inverter controller with capacitor current feedback and "back-EMF" decoupling , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[24]  Frede Blaabjerg,et al.  A Robust Control Scheme for Medium-Voltage-Level DVR Implementation , 2007, IEEE Transactions on Industrial Electronics.

[25]  Jan T. Bialasiewicz,et al.  Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey , 2006, IEEE Transactions on Industrial Electronics.