Low-Capacitance Cascaded H-Bridge Multilevel StatCom

This paper introduces a cascaded H-bridge multilevel converter (CHB-MC)-based StatCom system that is able to operate with extremely low dc capacitance values. The theoretical limit is calculated for the maximum capacitor voltage ripple, and hence minimum dc capacitance values that can be used in the converter. The proposed low-capacitance StatCom (LC-StatCom) is able to operate with large capacitor voltage ripples, which are very close to the calculated theoretical maximum voltage ripple. The maximum voltage stress on the semiconductors in the LC -StatCom is lower than in a conventional StatCom system. The variable cluster voltage magnitude in the LC-StatCom system drops well below the maximum grid voltage, which allows a fixed maximum voltage on the individual capacitors. It is demonstrated that the proposed LC-StatCom has an asymmetric V-I characteristic, which is especially suited for operation as a reactive power source within the capacitive region. A high-bandwidth control system is designed for the proposed StatCom to provide control of the capacitor voltages during highly dynamic transient events. The proposed LC-StatCom system is experimentally verified on a low-voltage seven-level CHB-MC prototype. The experimental results show successful operation of the system with ripples as high as 90% of the nominal dc voltage. The required energy storage for the LC-StatCom system shows significant reduction compared to a conventional StatCom design.

[1]  Fang Zheng Peng,et al.  A multilevel voltage-source inverter with separate DC sources for static VAr generation , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[2]  Fang Zheng Peng,et al.  Multilevel converters-a new breed of power converters , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[3]  Donald Grahame Holmes,et al.  Implementation of a direct digital predictive current controller for single and three phase voltage source inverters , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[4]  R.E. Betz,et al.  A digital current controller for three phase voltage source inverters , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[5]  E. Normand,et al.  Irradiation experiments with high-voltage power devices as a possible means to predict failure rates due to cosmic rays , 1997, Proceedings of 9th International Symposium on Power Semiconductor Devices and IC's.

[6]  H. Zeller.  Cosmic ray induced failures in high power semiconductor devices , 1995 .

[7]  C.O. Nwankpa,et al.  A new type of STATCOM based on cascading voltage source inverters with phase-shifted unipolar SPWM , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[8]  S. Linder,et al.  A high voltage IGBT and diode chip set designed for the 2.8 kV DC link level with short circuit capability extending to the maximum blocking voltage , 2000, 12th International Symposium on Power Semiconductor Devices & ICs. Proceedings (Cat. No.00CH37094).

[9]  R.W. De Doncker,et al.  A novel DC-link voltage control of PWM-switched cascade cell multi-level inverter applied to STATCOM , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[10]  J. de León Morales,et al.  Observer for DC voltages in a cascaded H-bridge multilevel STATCOM , 2007 .

[11]  Bin Chen,et al.  A Generalized Control Strategy of Per-Phase DC Voltage Balancing for Cascaded Multilevel Converter-based STATCOM , 2007, 2007 IEEE Power Electronics Specialists Conference.

[12]  H. Akagi,et al.  Control and Performance of a Transformerless Cascade PWM STATCOM With Star Configuration , 2007, IEEE Transactions on Industry Applications.

[13]  Luis Marroyo,et al.  Individual Voltage Balancing Strategy for PWM Cascaded H-Bridge Converter-Based STATCOM , 2008, IEEE Transactions on Industrial Electronics.

[14]  Cai Kun,et al.  3-phase AC-drives with passive front-ends with focus on the slim DC-link topology , 2008, 2008 IEEE Power Electronics Specialists Conference.

[15]  Bin Wu,et al.  A Novel DC Voltage Detection Technique in the CHB Inverter-Based STATCOM , 2008, IEEE Transactions on Power Delivery.

[16]  S. Kouro,et al.  Multicarrier PWM With DC-Link Ripple Feedforward Compensation for Multilevel Inverters , 2008, IEEE Transactions on Power Electronics.

[17]  Alex Q. Huang,et al.  Small-Signal Model-Based Control Strategy for Balancing Individual DC Capacitor Voltages in Cascade Multilevel Inverter-Based STATCOM , 2009, IEEE Transactions on Industrial Electronics.

[18]  M. Ishiko,et al.  Neutron induced single-event burnout of IGBT , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

[19]  Alex Q. Huang,et al.  Fault-Tolerant Design and Control Strategy for Cascaded H-Bridge Multilevel Converter-Based STATCOM , 2010, IEEE Transactions on Industrial Electronics.

[20]  T. Ise,et al.  Control Scheme of Cascaded H-Bridge STATCOM Using Zero-Sequence Voltage and Negative-Sequence Current , 2010, IEEE Transactions on Power Delivery.

[21]  Dawei Xiang,et al.  An Industry-Based Survey of Reliability in Power Electronic Converters , 2011, IEEE Transactions on Industry Applications.

[22]  M. Takasaki,et al.  A Transformerless D-STATCOM Based on a Multivoltage Cascade Converter Requiring No DC Sources , 2012, IEEE Transactions on Power Electronics.

[23]  R. E. Betz,et al.  Multigoal Heuristic Model Predictive Control Technique Applied to a Cascaded H-bridge StatCom , 2012, IEEE Transactions on Power Electronics.

[24]  Stig Munk-Nielsen,et al.  Design of Neutral-Point Voltage Controller of a Three-Level NPC Inverter With Small DC-Link Capacitors , 2013, IEEE Transactions on Industrial Electronics.

[25]  Muammer Ermis,et al.  Cascaded Multilevel Converter-Based Transmission STATCOM: System Design Methodology and Development of a 12 kV ±12 MVAr Power Stage , 2013, IEEE Transactions on Power Electronics.

[26]  Vassilios G. Agelidis,et al.  Evaluation of DC-link decoupling using electrolytic or polypropylene film capacitors in three-phase grid-connected photovoltaic inverters , 2013, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society.

[27]  M. Liserre,et al.  Toward Reliable Power Electronics: Challenges, Design Tools, and Opportunities , 2013, IEEE Industrial Electronics Magazine.

[28]  R. E. Betz,et al.  Optimization of Switching Losses and Capacitor Voltage Ripple Using Model Predictive Control of a Cascaded H-Bridge Multilevel StatCom , 2013, IEEE Transactions on Power Electronics.

[29]  Average power balancing control of a STATCOM based on the cascaded H-bridge PWM converter with star configuration , 2014, 2013 IEEE Energy Conversion Congress and Exposition.

[30]  Jinjun Liu,et al.  A Novel DC Voltage Control Method for STATCOM Based on Hybrid Multilevel H-Bridge Converter , 2013, IEEE Transactions on Power Electronics.

[31]  Christopher D. Townsend,et al.  Impact of Practical Issues on the Harmonic Performance of Phase-Shifted Modulation Strategies for a Cascaded H-Bridge StatCom , 2014, IEEE Transactions on Industrial Electronics.

[32]  Haider A. F. Almurib,et al.  SHE–PWM Cascaded Multilevel Inverter With Adjustable DC Voltage Levels Control for STATCOM Applications , 2014, IEEE Transactions on Power Electronics.

[33]  Frede Blaabjerg,et al.  Reliability of Capacitors for DC-Link Applications in Power Electronic Converters—An Overview , 2014, IEEE Transactions on Industry Applications.

[34]  Hossein Iman-Eini,et al.  State feedback control strategy and voltage balancing scheme for a transformer-less STATic synchronous COMpensator based on cascaded H-bridge converter , 2015 .

[35]  Vassilios G. Agelidis,et al.  Reduced-Capacitance Thin-Film H-Bridge Multilevel STATCOM Control Utilizing an Analytic Filtering Scheme , 2015, IEEE Transactions on Industrial Electronics.

[36]  Dianguo Xu,et al.  A Novel Control Method for Transformerless H-Bridge Cascaded STATCOM With Star Configuration , 2015, IEEE Transactions on Power Electronics.

[37]  Haider A. F. Almurib,et al.  A New Reactive Current Reference Algorithm for the STATCOM System Based on Cascaded Multilevel Inverters , 2015, IEEE Transactions on Power Electronics.

[38]  Vassilios G. Agelidis,et al.  Decoupled Control System for Cascaded H-Bridge Multilevel Converter Based STATCOM , 2016, IEEE Transactions on Industrial Electronics.