Thesis
Predictive Control of Grid-Connected Voltage-Sourced Converters
Washington State University
Master of Science (MS), Washington State University
12/2015
Handle:
https://hdl.handle.net/2376/101502
Abstract
Grid-connected voltage-sourced converters (VSC) are widely used in many industrial applications such as active front-end rectifiers, energy storage units, and integration of renewable energy sources. The control algorithm of a VSC, which is used in three- and single-phase systems, affects its steady-state and transient performance. For a three-phase grid-connected VSC, this thesis proposes a model predictive direct power control (MPDPC) with reduced switching frequency. This approach is proposed for both a real/reactive power controller (with a fixed input voltage) and a power port controller (with a variable input voltage). The proposed MPDPC leads to a low switching frequency in the steady state while showing a fast transient response. It also provides overcurrent protection without a separate protection device. In applying the proposed MPDPC to a power port, drawbacks of the conventional voltage controller are addressed by proposing a controller that uses power estimation and set point modulation. For a single-phase grid-connected VSC, this thesis proposes model predictive control (MPC) of real and reactive power of a the grid. The MPC, which is an alternative to the conventional PWM control, is proposed in both finite and continuous control set-based schemes. The proposed MPC provides a low-ripple steady-state response. It also provides a fast transient response. In addition, it provides overcurrent protection without using a separate protection device. The proposed finite control set-based model predictive control (FCS-MPC) uses a cost function minimization algorithm without using a modulator, which enables the addition of other optimization criteria into the controller. However, it provides a variable switching frequency. In contrast, the proposed continuous control set-based model predictive control (CCS-MPC) provides a fixed switching frequency using a modulator. Simulation results validate the effectiveness of the proposed controllers via several case studies.
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Details
- Title
- Predictive Control of Grid-Connected Voltage-Sourced Converters
- Creators
- Younes Sangsefidi
- Contributors
- Ali Mehrizi-Sani (Chair)Chen-Ching Liu (Committee Member)ANURAG K. SRIVASTAVA (Committee Member) - Washington State University, Electrical Engineering and Computer Science, School of
- Awarding Institution
- Washington State University
- Academic Unit
- Electrical Engineering and Computer Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Number of pages
- 73
- Identifiers
- 99900525111901842
- Language
- English
- Resource Type
- Thesis