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You searched for subject:(ripple based control). Showing records 1 – 2 of 2 total matches.

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Virginia Tech

1. Yu, Feng. Modeling of V2 Control with Composite Capacitors and Average Current Mode Control.

Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech

Various types of current mode control are being used in different applications. Model for current mode control is indispensable for proper system design. Since 1980s, modeling of current mode control has been a hot topic in power electronics field. In current mode control, sub-harmonic oscillation is a common issue, especially for constant frequency current mode control: like peak current mode control, valley current mode control, or average current mode control. Recently V2 control is becoming more and more popular due to its simple implementation ad super fast transient response. V2 control can also run into sub-harmonic oscillation just as current mode control. Efforts have been devoted to modeling of V2 control. A common property of different types of current mode control and V2 control is that they are all multi-loop structures and the inner loops are all highly nonlinear. Due to the nonlinearity of the inner loops, modeling of these structures is extremely difficult. Up to now, there are two main problems which havenâ t been solved: 1. modeling of average current mode control; 2. modeling of V2 control with composite capacitors. This thesis tries to solve these two problems and starts with V2 control. For V2 control with single type of bulk capacitors, an accurate model has been proposed previously. In this thesis, an equivalent circuit model is proposed to get better physical understanding. This method makes use of previous current mode control modeling result and relates V2 control with current mode control. To model V2 control with composite capacitors, capacitor currents and output voltage time domain waveforms are analyzed. Based on describing function method, transfer function from control to output is derived. The modeling result shows that with more parallel ceramic capacitors, system has smaller stability margin. For average current mode control, the structure is compared with V2 control. Similarity between the structures of current compensator in average current mode and output capacitor network in V2 control is identified. V2 model is utilized for average current mode control. The modeling derivation process is simplified. For the current compensator in average current mode control, it is not desired to have a high frequency pole from stability point of view. As a conclusion, a circuit model for V2 control with bulk capacitors is proposed and another two problems are examined: modeling of V2 control with composite capacitors and modeling of average current mode control. It has been demonstrated that there is similarity between these two structures. The modeling results are verified through simulation and experiments. Advisors/Committee Members: Lee, Fred C. (committeechair), Boroyevich, Dushan (committee member), Mattavelli, Paolo (committee member).

Subjects/Keywords: average current mode control; modeling; describing function; V2 Control; ripple based control; composite capacitors

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Yu, F. (2011). Modeling of V2 Control with Composite Capacitors and Average Current Mode Control. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33458

Chicago Manual of Style (16th Edition):

Yu, Feng. “Modeling of V2 Control with Composite Capacitors and Average Current Mode Control.” 2011. Masters Thesis, Virginia Tech. Accessed December 11, 2019. http://hdl.handle.net/10919/33458.

MLA Handbook (7th Edition):

Yu, Feng. “Modeling of V2 Control with Composite Capacitors and Average Current Mode Control.” 2011. Web. 11 Dec 2019.

Vancouver:

Yu F. Modeling of V2 Control with Composite Capacitors and Average Current Mode Control. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10919/33458.

Council of Science Editors:

Yu F. Modeling of V2 Control with Composite Capacitors and Average Current Mode Control. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/33458

2. Barth, Christopher. Implementation of dithering digital ripple correlation control for photovoltaic maximum power point tracking with windowed sensing.

Degree: MS, 1200, 2015, University of Illinois – Urbana-Champaign

This thesis presents the hardware demonstration of a new method for rapid and precise maximum power point tracking in photovoltaic applications using dithered PWM control. Constraints imposed by efficiency, cost and component size limit the available PWM resolution of a power converter, and may in turn limit the MPP tracking efficiency of the photovoltaic (PV) system. In these scenarios, PWM dithering can be used to improve average PWM resolution. This thesis provides the hardware demonstration of a control technique that uses ripple correlation control (RCC) on the dithering ripple, thereby achieving simultaneous fast tracking speed and high tracking accuracy. Moreover, the proposed method solves some of the practical challenges that have to date limited the effectiveness of RCC in solar PV applications. The theoretical derivation of dithering digital ripple correlation control (DDRCC) is reviewed, and a low-cost method of using digitally enhanced windowing to improve the effective sensing resolution of the system is presented. Finally, experimental results that show excellent tracking speed and accuracy with basic hardware requirements are given. Advisors/Committee Members: Pilawa-Podgurski, Robert C. (advisor).

Subjects/Keywords: digital control of photovoltaics; digital ripple correlation control (DRCC); energy harvesting; maximum power point trackers (MPPT); Photovoltaic cells; ripple-based control; ripple correlation control (RCC); solar energy; maximum power point tracking; digitally enhanced analog; windowed analog-to-digital converter (ADC)

…algorithms. Ripple correlation control (RCC) has been shown to be an adaptable approach… …thesis builds on the theoretical introduction of dithering digital ripple correlation control… …systems which use dithered PWM control. Additionally, by applying RCC to the ripple caused by… …perturbation to reduce tracking error, and this is the benefit of ripple correlation control. 10… …2.3.3 Ripple Correlation Control Ripple correlation control (RCC) is a method of… 

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Barth, C. (2015). Implementation of dithering digital ripple correlation control for photovoltaic maximum power point tracking with windowed sensing. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/72811

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Barth, Christopher. “Implementation of dithering digital ripple correlation control for photovoltaic maximum power point tracking with windowed sensing.” 2015. Thesis, University of Illinois – Urbana-Champaign. Accessed December 11, 2019. http://hdl.handle.net/2142/72811.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Barth, Christopher. “Implementation of dithering digital ripple correlation control for photovoltaic maximum power point tracking with windowed sensing.” 2015. Web. 11 Dec 2019.

Vancouver:

Barth C. Implementation of dithering digital ripple correlation control for photovoltaic maximum power point tracking with windowed sensing. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2015. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/2142/72811.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Barth C. Implementation of dithering digital ripple correlation control for photovoltaic maximum power point tracking with windowed sensing. [Thesis]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/72811

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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