Functional Predictive Control for Voltage Stability Improvements of Autonomous Hybrid Wind–Diesel Power System

Abstract

This study investigates the application of the model predictive control technique for voltage stability of an isolated hybrid wind–diesel power system based on reactive power control. The proposed generation system mainly consists of a synchronous generator for a diesel-generator system and an induction generator for a wind energy conversion system. A static VAR compensator is used to stabilize load voltage through compensating reactive power. Two control paths are used to stabilize load bus voltage based on model predictive control. The first control path is used to adjust the total reactive power of the system by controlling the static VAR compensator firing angle. The second is proposed to control the excitation voltage of the synchronous generator. Model predictive control is used to determine t optimal control actions, including system constraints. To mitigate calculation effort and reduce numerical problems, especially in a large prediction horizon, an exponentially weighted functional model predictive control (F-model predictive control) is applied. The proposed controller was tested through step change in load reactive power plus step increase in input wind power. The performance of the proposed system with the proposed controller was compared with classical model predictive control; moreover, this scheme is tested against parameter variations.

Keywords:

• induction generator
• synchronous generator
• reactive power control
• stand-alone hybrid wind–diesel generation unit
• static VAR compensator
• functional model predictive control

Additional information

Notes on contributors

Ahmed M. Kassem

Ahmed M. Kassem received his B.Sc. in electrical engineering from Assiut University, Egypt, in 1991; his M.Sc. in electrical engineering from Eindhoven Technical University, Netherlands, in 1999; and his Ph.D. in electrical engineering from Minia University, Minia, Egypt, in 2006. He is currently an associate professor of electrical power engineering at Beni Suef University, Egypt. His research interests include voltage stability analysis, power systems operation and control, renewable energy, electric machines control, and intelligent control applications.

Almoataz Y. Abdelaziz

Almoataz Y. Abdelaziz received B.Sc. and M.Sc. in electrical engineering from Ain Shams University, Egypt, in 1985 and 1990, and Ph.D. in electrical engineering according to the channel system between Ain Shams University, Egypt, and Brunel University, England, in 1996. He is currently a professor of electrical power engineering at Ain Shams University. He is a senior editor of Ain Shams Engineering Journal, editor of Electric Power Components & Systems, and a member of editorial board in several international journals. He has been awarded many prizes for distinct research and international publishing from Ain Shams University, Egypt. He has authored or co-authored more than 160 refereed journal and conference papers in his research areas, which include the applications of artificial intelligence and new optimization techniques in power system protection, operation, planning and control.