Fixed Switching Frequency Sliding Mode Control for Single-Phase Unipolar Inverters

• Published in: IEEE transactions on power electronics Vol. 27; no. 5; pp. 2507 - 2514
• Main Authors: Abrishamifar, A., Ahmad, A. A., Mohamadian, M.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Circuit properties; Circuits of signal characteristics conditioning (including delay circuits); Electric potential; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electrical equipment; Electrical machines; Electronic circuits; Electronics; Energy efficiency; Exact sciences and technology; Frequencies; Harmonic analysis; Inverters; Law; Modulators; Power electronics, power supplies; Prototypes; Pulse width modulation; Pulse width modulator; Regulation and control; Robust control; Sheet molding compounds; Signal convertors; Simulation; Sliding mode control; Switches; Switching; Switching frequency; uinpolar single phase inverter; Vibration; Performance evaluation; Power converter; Sliding mode; sliding mode control; Power system harmonics; Power system stability; Pulse width modulator; Frequency control; Regulation(control); Switching conditions; Output voltage; Energy quality; Boundary layer; Inverter; Dynamic response; High performance; Pulse width; Dynamic characteristic; Control system; Power electronics; Phase reversal; Experimental study; Switching; Phase shifter; Pulse modulator; Operating conditions; Robust control; System simulation; Service quality; uinpolar single phase inverter
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2011.2175249

Sliding mode control (SMC) is recognized as robust controller with a high stability in a wide range of operating conditions, although it suffers from chattering problem. In addition, it cannot be directly applied to multiswitches power converters. In this paper, a high performance and fixed switching frequency sliding mode controller is proposed for a single-phase unipolar inverter. The chattering problem of SMC is eliminated by smoothing the control law in a narrow boundary layer, and a pulsewidth modulator produces the fixed frequency switching law for the inverter. The smoothing procedure is based on limitation of pulsewidth modulator. Although the smoothed control law limits the performance of SMC, regulation and dynamic response of the inverter output voltage are in an acceptable superior range. The performance of the proposed controller is verified by both simulation and experiments on a prototype 6-kVA inverter. The experimental results show that the total harmonic distortion of the output voltage is less than 1.1% and 1.7% at maximum linear and nonlinear load, respectively. Furthermore, the output dynamic performance of the inverter strictly conforms the standard IEC62040-3. Moreover, the measured efficiency of the inverter in the worst condition is better than 95.5%.