Implementation of Hysteresis Current Control for Single-Phase Grid Connected Inverter

ABSTRACT:

This paper describes a control method for single phase grid-connected inverter system for distributed generation application. Single-band Hysteresis Current Controller is applied as the control method. The control algorithm is implemented in Digital Signal Processor (DSP) TMS320F2812. The control method provides robust current regulation and achieve unity power factor. Simulation and experimental results are provided to demonstrate the effectiveness of the design.

 KEYWORDS:

  1. Single-Phase Grid Connected Inverter
  2. Hysteresis Current Control and TMS320F2812

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

 image001

Fig.1 Proposed hystresis current control for single-phase grid connected inverter

EXPECTED SIMULATION RESULTS:

 image002

Fig. 2 Error signal and hysteresis band

image003

Fig.3. Switching pattern of hysteresis current control

image004

Fig.4 Inverter output voltage before inductor

image005

Fig. 5 Simulation result Grid voltage and Grid current

image006

Fig. 6 Simulation result Grid voltage and Grid current at unity power factor

 CONCLUSION:

This paper presents a single-band hysteresis current control for single-phase grid connected inverter. The effectiveness of the control scheme has been verified both by simulation and experimentally. The current produced by this inverter is in phase with grid voltage and also achieve unity power factor. This method is robust and effective than conventional reference signal generation by the controller and matching it with the grid voltage at later stage. This method also reduces the number of components such as Phase Lock Loop (PLL) circuits and cost significantly.

REFERENCES:

[1] http://en.wikipedia.org/wiki/Distributed _ generation

[2] Kojabadi, et. al, “A Novel DSP-Based Current-Controlled PWM Strategy for Single Phase Grid Connected Inverters”, IEEE Trans. on Power Electronics, Vol. 21,No.4, July 2000, pp. 985-993

[3] Bor-Jehng Kang and Chang-Ming Liaw, “A Robust Hysteresis Current-Controlled PWM Inverter for Linear PMSM Driven Magnetic Suspended Positioning System”. IEEE Trans. on Ind. Electronics, Vol. 48, No. 5, October 2001, pp 956-967

[4] S. Buso, S. Fasolo, L. Malesani, and P. Mattavelli, “A Dead-Beat Adaptive Hysteresis Current Control” IEEE Trans. on Ind. Applications, Vol. 36, No.4 July/August. 2000, pp 1174-1180

[5] P.A. Dahono and I. Krisbiantoro, “A Hystersis Current Controller for Single-Phase Full-bridge Inverter”. Int. Conf. on Power Electronics and Electric Drives 2001, Indonesia, pp 415-419

Leave a Reply

Your email address will not be published. Required fields are marked *