Switching Frequency Formulation for Predictive Current Control in Grid-Connected VSI

Abstract

In this paper, a switching frequency has been formulated for grid-connected voltage source inverter (VSI) operated using the Continuous Control Set-Predictive Current Control (CCS-PCC) technique. An instantaneous expression of switching frequency has been derived for the VSI operated using the predictive current control technique. The effect of sampling frequency has been analyzed on the switching frequency of the converter operation. The effect of sampling time has a direct impact on the switching frequency as the cost function of the PCC depends on the sampling frequency. The analysis provides a generalized mathematical expression of switching frequency for the VSI operating in current control mode using the predictive current control method. With the help of this generalized expression, the maximum switching frequency and minimum load current error have been obtained. Simulation has been performed for verification of the analytical results through a Typhoon HIL-402 kit for real-time simulation and experimental validation.

KEYWORDS:

• Grid-tied system
• inverter
• Predictive current control
• Sampling time
• Switching frequency
• Switching power loss

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Sandeep Ojha

Sandeep Ojha received the Bachelor of Technology in electrical engineering in 2013 from the JSS Academy of Technical Education Noida, Uttar Pradesh, India; Master of Technology in power electronics and drives in 2016 from Madan Mohan Malaviya University of Technology, Gorakhpur, Uttar Pradesh, India; and pursuing PhD from the Motilal Nehru National Institute of Technology Allahabad, Prayagraj, Uttar Pradesh, India. His research interests include control of power electronics converters, predictive control, and switching theory. Email: [email protected]

Rajesh Gupta

Rajesh Gupta (S’05-M’08-SM’11) received the Bachelor of Technology in 1993 from Madan Mohan Malaviya Engineering College, Gorakhpur, Uttar Pradesh, India; Master of Technology in 1995 from Birla Institute of Technology, Ranchi, India; and PhD in 2007 from the Indian Institute of Technology Kanpur, Uttar Pradesh, India. He is currently a professor & head of the Electrical Engineering Department at Motilal Nehru National Institute of Technology Allahabad, Prayagraj, India. His research interests include control in power electronics, bidirectional converters, power conversion of renewable energy resources, energy storage, EV charging, systems, and control theory. He guided 12 PhD and 50 Master’s students. He has filed 3-patents in the area of multilevel bidirectional converter, hybrid converter, and portable hybrid power supply. His name appeared in the top 2% scientists in the world under the category of Electrical & Electronics, published by Stanford University in 2020 and 2021. Dr. Gupta is serving as an associate editor of IEEE Transactions on Energy Conversion and IEEE Power and Energy Society Letters.