A Zero-Sequence Steerable CBPWM Strategy for Eliminating Zero-Sequence Current of Dual-Inverter Fed Open-End Winding Transformer Based PV Grid-Tied System With Common DC Bus

Aiming at the issue of zero-sequence current (ZSC) in the dual-inverter fed open-end winding transformer (OEWT-DI) based photovoltaic (PV) grid-tied system with common DC bus, a carrier-based pulse width modulation (CBPWM) strategy with steerable zero-sequence is proposed. The modulation wave of the dual-inverter is decomposed into two modulation waves with same amplitude and 120° phase difference, and each of the modulation waves is modified through adding steerable zero-sequence component. The zero-sequence component is regulated by the ZSC control loop based on a quasi-proportional resonant regulator, which is designed to suppress the ZSC caused by the dead-time effect and other nonlinear factors. Meanwhile, the effective modulation range is also analyzed. The proposed strategy is an alternative approach to the conventional zero-sequence steerable phase shift based space vector pulse width modulation (SVPWM) strategy, but has the advantage of easy implementing and low computation cost. With the proposed strategy, both the high-frequency and low-frequency ZSC in the system can be effectively suppressed. Effectiveness of the proposed strategy is validated by experimental results on a 30-kW OEWT-DI experimental platform.

[1]  Yijie Zhou,et al.  Zero-Sequence Current Suppression Strategy of Open-Winding PMSG System With Common DC Bus Based on Zero Vector Redistribution , 2015, IEEE Transactions on Industrial Electronics.

[2]  Z. Q. Zhu,et al.  Nonparametric Sensorless Drive Method for Open-Winding PMSM Based on Zero-Sequence Back EMF With Circulating Current Suppression , 2017, IEEE Transactions on Power Electronics.

[3]  Jayati Dey,et al.  Control, implementation, and analysis of a dual two-level photovoltaic inverter based on modified proportional–resonant controller , 2018 .

[4]  Heng Nian,et al.  A Sensorless Drive Strategy for Open-End Winding PMSM With Common DC Voltage Based on Lower Switching Frequency , 2019, IEEE Transactions on Energy Conversion.

[5]  G. A. de Almeida Carlos,et al.  Dynamic Voltage Restorer Based on Three-Phase Inverters Cascaded Through an Open-End Winding Transformer , 2016, IEEE Transactions on Power Electronics.

[6]  Liuchen Chang,et al.  Multilevel Inverters for Grid-Connected Photovoltaic Applications: Examining Emerging Trends , 2018, IEEE Power Electronics Magazine.

[7]  Z. Q. Zhu,et al.  A Novel Zero-Sequence Model-Based Sensorless Method for Open-Winding PMSM With Common DC Bus , 2016, IEEE Transactions on Industrial Electronics.

[8]  K. Gopakumar,et al.  A Space-Vector Modulation Scheme for a Dual Two-Level Inverter Fed Open-End Winding Induction Motor Drive for the Elimination of Zero-Sequence Currents , 2002 .

[9]  Sandeep Anand,et al.  DC Voltage Controller for Asymmetric-Twin-Converter-Topology-Based High-Power STATCOM , 2013, IEEE Transactions on Industrial Electronics.

[10]  V. Oleschuk,et al.  Phase-Shift-Based Synchronous Modulation of Dual Inverters for an Open-End Winding Motor Drive with Elimination of Zero Sequence Currents , 2005, 2005 International Conference on Power Electronics and Drives Systems.

[11]  I. Takahashi,et al.  High-performance direct torque control of an induction motor , 1989 .

[12]  Ronghai Qu,et al.  A Novel Zero-Sequence Current Elimination PWM Scheme for an Open-Winding PMSM With Common DC Bus , 2019, IEEE Transactions on Power Electronics.

[13]  Jayati Dey,et al.  Sliding-Mode Control of PWM Dual Inverter-Based Grid-Connected PV System: Modeling and Performance Analysis , 2016, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[14]  Jin Liu,et al.  Dual-Space Vector Control of Open-End Winding Permanent Magnet Synchronous Motor Drive Fed by Dual Inverter , 2016, IEEE Transactions on Power Electronics.

[15]  Yang Li,et al.  Circulating Current Analysis and Suppression for Configured Three-Limb Inductors in Paralleled Three-Level T-Type Converters With Space-Vector Modulation , 2017, IEEE Transactions on Power Electronics.

[16]  Heng Nian,et al.  Zero-Sequence Current Suppression Strategy With Reduced Switching Frequency for Open-End Winding PMSM Drives With Common DC BUS , 2019, IEEE Transactions on Industrial Electronics.

[17]  V. Blasko,et al.  Analysis of a hybrid PWM based on modified space vector and triangle comparison methods , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[18]  Yin Jingyua.  A New Type of Photovoltaic Grid-Connected Converter Composed of Dual Inverters Connected in Series , 2014 .

[19]  V. T. Somasekhar,et al.  Effect of Zero-Vector Placement in a Dual-Inverter Fed Open-End Winding Induction Motor Drive With Alternate Sub-Hexagonal Center PWM Switching Scheme , 2008, IEEE Transactions on Power Electronics.

[20]  Wenping Cao,et al.  Controller Strategy for Open-Winding Brushless Doubly Fed Wind Power Generator With Common Mode Voltage Elimination , 2019, IEEE Transactions on Industrial Electronics.

[21]  Heng Nian,et al.  Torque Ripple Suppression Method With Reduced Switching Frequency for Open-Winding PMSM Drives With Common DC Bus , 2019, IEEE Transactions on Industrial Electronics.

[22]  Rae-Young Kim,et al.  Suppression of Common-Mode Voltage Using a Multicentral Photovoltaic Inverter Topology With Synchronized PWM , 2014, IEEE Transactions on Industrial Electronics.

[23]  Srirama Srinivas,et al.  Effect of Zero-Vector Placement in a Dual-Inverter Fed Open-End Winding Induction-Motor Drive With a Decoupled Space-Vector PWM Strategy , 2008, IEEE Transactions on Industrial Electronics.

[24]  Seung-Gi Jeong,et al.  The analysis and compensation of dead-time effects in PWM inverters , 1991 .

[25]  Jihong Zhu,et al.  Fault-Tolerant Direct Thrust Force Control for a Dual Inverter Fed Open-End Winding Linear Vernier Permanent-Magnet Motor Using Improved SVPWM , 2018, IEEE Transactions on Industrial Electronics.

[26]  K. Gopakumar,et al.  A dual two-level inverter scheme with common mode voltage elimination for an induction motor drive , 2004, IEEE Transactions on Power Electronics.

[27]  Ned Mohan,et al.  Carrier-Based Implementation of SVPWM for Dual Two-Level VSI and Dual Matrix Converter With Zero Common-Mode Voltage , 2015, IEEE Transactions on Power Electronics.

[28]  Danwei Wang,et al.  Relationship between space-vector modulation and three-phase carrier-based PWM: a comprehensive analysis [three-phase inverters] , 2002, IEEE Trans. Ind. Electron..

[29]  Domenico Casadei,et al.  A New Multilevel Conversion Structure for Grid-Connected PV Applications , 2009, IEEE Transactions on Industrial Electronics.