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neutral-point-potential
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A DSP-based unified three phase/switch/level unity power factor rectifier using feedback linearization for DC-bus voltage control
, Article 7th International Conference on Power Electronics and Drive Systems, PEDS 2007, Bangkok, 27 November 2007 through 30 November 2007 ; 2007 , Pages 778-783 ; 1424406455 (ISBN); 9781424406456 (ISBN) ; Mirzaee Teshnizi, H ; Zolghadri, M. R ; Sharif University of Technology
2007
Abstract
In this paper, a unified hybrid vector control of vector modulated VIENNA I rectifier is presented. Feedback linearization technique is used for the DC-link voltage control. For this purpose, at first a mathematical model of the VIENNA I rectifier is derived. Using this model, it is shown that the dynamic of the rectifier falls into two categories; linear inner dynamic which consists of inner current control and neutral-point potential control and nonlinear outer dynamic which consists of the DC-link voltage control. Based on these facts, a hybrid vector control scheme meaning linear vector control of inner dynamics and nonlinear vector control of outer dynamic is devised. Simulations...
Dual Lagrangian modeling and Lyapunov-based control of four-wire three-level three-phase NPC voltage-source rectifier
, Article 2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012, Venice, 18 May 2012 through 25 May 2012 ; 2012 , Pages 744-751 ; 9781457718281 (ISBN) ; Abedi, A ; Ahmadigorji, M ; Reykandeh, M. A ; Sharif University of Technology
IEEE
2012
Abstract
An ac neutral wire is connected to the midpoint of the dc bus of the three level/phase NPC rectifiers and then a new dual Lagrangian model of the rectifier is presented in this paper. At first, the load current can be obtained in two forms: 1. the load current involving the current of capacitor C1 2. The load current involving the current of capacitor C2 and then the new model is founded based on the superposition law, the load current and The Euler-Lagrange description of the rectifier. The new model is two nonlinear state space equations and as a result we define two positive definite Lyapunov function candidates based on two equations. Finally two Lyapunov-based controllers are designed...
Dual Lagrangian modeling and Lyapunov-based control of three-level three-phase NPC voltage-source rectifier
, Article 2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012, Venice, 18 May 2012 through 25 May 2012 ; 2012 , Pages 737-743 ; 9781457718281 (ISBN) ; Ahmadigorji, M ; Abedi, A ; Sharif University of Technology
IEEE
2012
Abstract
The load current of three level/phase neutral point clamped rectifier could be expressed in two forms: the load current involving the current of capacitor C1, and the load current involving the current of capacitor C2. Using the Euler-Lagrange model based on the superposition law and the obtained load current, a new dual Lagrangian model of the rectifier is founded in this paper and then the two obtained nonlinear state space models are developed in dq0 reference frame. According to the new model, two positive definite Lyapunov function candidates are defined and a Lyapunov-based control is applied to the rectifier. Each of the function is utilized to control its corresponding output voltage...