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:
Fig.1
Proposed hystresis current control for single-phase grid connected inverter
EXPECTED SIMULATION RESULTS:
Fig.
2 Error signal and hysteresis band
Fig.3.
Switching pattern of hysteresis current control
Fig.4
Inverter output voltage before inductor
Fig.
5 Simulation result Grid voltage and Grid current
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:
[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
