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Multilevel sliding mode control in hybrid power systems

Yan, Wenguang
http://rave.ohiolink.edu/etdc/view?acc_num=osu1172766787

Abstract Details

2007, Doctor of Philosophy, Ohio State University, Electrical Engineering.
This dissertation is directed towards the development of multilevel control for a hybrid power system (HPS), which operates with multi power sources. A hybridized powertrain can satisfy a power request in many different ways, in which some optimality can be achieved. On the other hand, increased complexity of powertrain structure requires more complicated control design. Moreover, unavailable measurement, disturbances, nonlinearities and dynamics in each power component plus the interactions between them make the control problem even more challenging. The purpose of this work is to investigate control problems in a HPS using a multilevel approach such that optimality of system behavior is approached, while computational load is reduced compared with conventional optimal control methodology. First, strategy level controls are developed for a HPS with different types of power components. In the case where the dynamic of a fuel converter can be ignored, the feasibility of optimizing energy consumption is analyzed based on the characteristics of a fuel converter in a steady state manner. In the case where all dynamics of power components need to be considered, the Minimum Principle is adopted to find the optimal control. However, this approach results in a high order boundary value problem which is difficult to solve, even using numerical tools. In order to guarantee accurate output power and to reduce the order of system equations, a suboptimal control strategy using the sliding mode concept is developed. Next, component level control design problems for a HPS with an electric power summation point are addressed. A flux observer with controllable convergent rate is proposed for an induction motor. Sliding mode methodology has been applied to develop control algorithms for different powertrain components. A sliding mode pulse width modulation (SMPWM) method is developed to feed desired current to three phase load with the feature of controlling the average value of the neutral point at the same time, which allows optimization of inverter operation. The proposed SMPWM is experimentally tested. Current split control and engine speed control are also discussed in the framework of HPS operation.
Vadim Utkin (Advisor)

Recommended Citations

Citations

  • Yan, W. (2007). Multilevel sliding mode control in hybrid power systems [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1172766787

    APA Style (7th edition)

  • Yan, Wenguang. Multilevel sliding mode control in hybrid power systems. 2007. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1172766787.

    MLA Style (8th edition)

  • Yan, Wenguang. "Multilevel sliding mode control in hybrid power systems." Doctoral dissertation, Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1172766787

    Chicago Manual of Style (17th edition)

osu1172766787
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© 2007, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.