Digital Implementation of Sliding Mode Control Technique on SSC for Load Balancing and Reactive Power Compensation

Abstract

This paper presents an implementation of a new control scheme of a 3-phase solid-state compensator (SSC) to compensate reactive power and to balance unbalanced loads. An IGBT- based current controlled PWM voltage source inverter (VSI) with a dc bus capacitor is employed as an SSC. A sliding mode controller (SMC) over the dc bus voltage of the SSC is used to derive reference supply currents in phase with supply voltages. The SMC closed loop controller over dc bus voltage of SSC provides robust control and transient free dynamic response of the system. An indirect current control over the reference and sensed supply currents is realised for generating the gating pulses for the IGBTs of the SSC. Test results of the SSC for the cases of single-phase and 3-phase lagging power-factor loads are presented and discussed in detail to demonstrate the reactive power compensation and loads balancing capabilities of the SSC.

Indexing terms:

• Solid state compensator
• Sliding mode control
• Digital implementation
• Load balancing and reactive power compensation

Additional information

Notes on contributors

Bhim Singh

Bhim Singh was born in Rahamapur, UP, India in 1956. He received BE (Electrical) degree from the University of Roorkee, India in 1977 and M Tech and PhD degrees from the Indian Institute of Technology (IIT), New Delhi, in 1979 and 1983, respectively. In 1983, he joined as a Lecturer and in 1988 became a Reader in the Department of Electrical Engineering, University of Roorkee. In December 1990, he joined as an Assistant Professor, became an Associate Professor in 1994 and full Professor in 1997 at the Department of Electrical Engineering, IIT Delhi. His field of interest includes power electronics, electrical machines and drives, active filters, static VAR compensator, analysis and digital control of electrical machines. Prof Singh is a Fellow of INAE, 1E(I) and IETE, a Life Member of ISTE, SSI and NIQR and Senior Member IEEE.

B N Singh

Brij N Singh was born at Shahpur Charki, UP (India) in 1968. He received his BE degree from Madan Mohan Malviya Engineering College Gorakhpur, ME degree from University of Roorkee and PhD degree from Indian Institute of Technology Delhi in 1989, 1991 and 1996, respectively. In 1996 he joined École de technology supérieure, Montreal, as a post-doctoral fellow to work in the area of FACTs and Power Quality. In 1999 he joined Concordia University, Montreal and worked in the area of power supplies for telecommunication and computer systems. In January 2000 he joined as an Assistant Professor, Department of Electrical Engineering and Computer Science, Tulane University, New Orleans. His field of interest includes power quality, power supplies, digital control of electrical machines, renewable energy sources, and new energy storage devices.

Dr Singh is a life member to IEEE Power Electronics and Industrial Electronics societies and he is also a member of IEEE Industry Applications and Power Engineering societies.

Ambrish Chandra

Ambrish Chandra was born in India in 1955. He received BE degree from the University of Roorkee, India, M Tech degree from IIT, New Delhi, India and PhD-degree from University of Calgary, Canada, in 1977, 1980, and 1987, respectively. He worked as a Lecturer and later as a Reader at University of Roorkee. Since 1994 he is working as a Professor in Electrical Engineering Department at École de technologie supérieure, University of Québec, Montreal, Canada. His main research interests are power quality, active filters, static reactive power compensation, and flexible AC transmission systems (FACTS).

Dr Chandra is a senior member of IEEE and member of the Order of Engineers of Quebec, Canada.

Kamal Al-Haddad

Kamal Al-Haddad was born in Beirut, Lebanon, in 1954. Holds Canada Research Chair in Energy Conversion and Power Electronics since 2002. He received the BSc A and the MSc A degrees from the University of Québec á Trois Riviéres, Canada, and the PhD degree from the Institut National Polythechnique, Toulouse, France, in 1982, 1984, and 1988, respectively.

From June 1987 to June 1990, he has been a professor at the Engineering Department, Université du Québec á Trois Riviéres. In June 1990, he joined the teaching staff as a professor of the Electrical Engineering Department of the École de Technologie Supérieure, Montreal, Canada. His fields of interest are static power converters, harmonics and reactive power control, switch mode and resonant converters including the modelling, control, and development of industrial prototypes for various applications. Dr Al-Haddad is a co-author of the Power System Blockset software of Matlab and a member of the Order of Engineering of Quebec and the Canadian Institute of Engineers.