Switching Harmonics Suppression of Single-loop Multi-sampling Control of Grid-connected Inverter

Multi-sampling control provides an attractive way to reduce the control delays in LCL grid connected inverters, then the bandwidth and stability margin will be improved. However, high frequency switching harmonics (SHs) are introduced in the control loop, which may cause low frequency aliasing and deteriorate the power quality. In this paper, the multi-sampled currents are reconstructed through the double-sampled average currents, which is simple and easy to implement in a microprocessor. As a result, most of the SHs are removed and the power quality is better than the conventional multi-sampling control. Finally, a single-loop pseudo-derivative-feedback control with inverter current feedback is employed, and the effectiveness of the proposed method is verified through simulation.

[1]  Lin Jiang,et al.  Pseudo-Derivative-Feedback Current Control for Three-Phase Grid-Connected Inverters With LCL Filters , 2016, IEEE Transactions on Power Electronics.

[2]  Frede Blaabjerg,et al.  Damping Methods for Resonances Caused by LCL-Filter-Based Current-Controlled Grid-Tied Power Inverters: An Overview , 2017, IEEE Transactions on Industrial Electronics.

[3]  Shaojun Xie,et al.  Analysis and suppression of the aliasing in real-time sampling for grid-connected LCL-filtered inverters , 2016, 2016 IEEE 11th Conference on Industrial Electronics and Applications (ICIEA).

[4]  Zhang Xing,et al.  Implementation of multi-sampling current control for grid-connected inverters using TI TMS320F28377x , 2017, 2017 32nd Youth Academic Annual Conference of Chinese Association of Automation (YAC).

[5]  P. Mattavelli,et al.  Analysis of Multisampled Current Control for Active Filters , 2007, IEEE Transactions on Industry Applications.

[6]  J. Bocker,et al.  Can oversampling improve the dynamics of PWM controls? , 2013, 2013 IEEE International Conference on Industrial Technology (ICIT).

[7]  Paolo Mattavelli,et al.  High-Bandwidth Multisampled Digitally Controlled DC–DC Converters Using Ripple Compensation , 2008, IEEE Transactions on Industrial Electronics.

[8]  Igor Larrazabal,et al.  LCL Grid Filter Design of a Multimegawatt Medium-Voltage Converter for Offshore Wind Turbine Using SHEPWM Modulation , 2016, IEEE Transactions on Power Electronics.

[9]  Frede Blaabjerg,et al.  Overview of Multisampling Techniques in Power Electronics Converters , 2019, IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society.

[10]  Frede Blaabjerg,et al.  Multisampling Method for Single-Phase Grid-Connected Cascaded H-Bridge Inverters , 2020, IEEE Transactions on Industrial Electronics.

[11]  Xinbo Ruan,et al.  A Real-Time Computation Method With Dual Sampling Mode to Improve the Current Control Performance of the $LCL$-Type Grid-Connected Inverter , 2015, IEEE Transactions on Industrial Electronics.

[12]  H. Fujita,et al.  A Single-Phase Active Filter Using an H-Bridge PWM Converter With a Sampling Frequency Quadruple of the Switching Frequency , 2008, IEEE Transactions on Power Electronics.

[13]  Xing Zhang,et al.  Study of a Current Control Strategy Based on Multisampling for High-Power Grid-Connected Inverters With an LCL filter , 2017, IEEE Transactions on Power Electronics.