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This paper deals with the following topics: power electronics systems; advanced analysis and control methods; aircraft power systems; digital control of SMPS; digital control design; digital and mixed signal ICs; electric machines and drives; components and circuits modeling
Electric power distribution systems can be found almost everywhere, from ship power systems to data centers. In many critical applications, there is need to maintain minimal operating capability under fault conditions. To carry out this goal it is necessary to develop energy distribution control techniques, which let implement a self-reconfigurable energy distribution system. This research project...
This paper presents a distributed control system architecture for power electronics conversion systems. Control partitioning is described and a two-level control hierarchy is proposed. Specifically, a hardware manager-controlling the actual power conversion process-, and an application manager, hardware independent universal controller are introduced and implemented. A detailed description of these...
This paper studies the design of a maximum power point tracker (MPPT) for low power portable solar array applications. The discussion will compare different digital and mixed signal implementation approaches of the same perturb and observe algorithm, in particular: simple P&O algorithm on the duty cycle, P&O algorithm using an analog inner voltage control loop and finally using a digital voltage...
Closed loop system modeling for the modular masterless multiphase architecture with paralleled voltage and current sharing regulation loops is presented in this paper. The parallel structure allows both loops to have high bandwidth. Modeling results of such systems show that the voltage loop and current loop can be designed independently assuming identical power stages in each phase. The effects of...
Envelope following (EF) method is an approximate transient simulation technique which considers switching dynamics. It skips analysis of several switching cycles and considers the cycles by using, for example, the backward Euler or the trapezoidal type algorithms. It is more accurate than the averaging method because it considers switching ripples and it is still efficient. However it has been proposed...
Double-integral Fourier analysis is utilized in this paper to study steady-state and dynamic characteristics of interleaved buck converters. The method presented is general and does not assume commensurability of the perturbation and the switching frequency. The resulting PWM model captures the complete spectrum of the PWM output and predicts the time-varying effect at all frequencies where it may...
Trajectory-based controls respond spontaneously to control and system disturbances. Such performance is useful in dynamic applications such as motor drives or converters to meet tracking requirements. This paper evaluates possible trajectory paths a buck or boost converter can take, and the use of geometric surfaces to guide these paths. Numerical procedures are developed to find a converter's system-limited...
A set of augmentation-based controls is introduced for DC-DC converters. The controls support null response to disturbances in line or load for basic DC-DC converters. Augmentation resembles lossy snubbers, and takes the form of switched resistance to dissipate extra stored energy, resistive paths to deliver energy to the load while energy storage is increasing, and switched capacitance from an augmented...
This paper extends the recently introduced approach in constrained optimal control methods for fixed frequency switch-mode DC-DC converters to the parallel interleaved synchronous step-down circuit topology. A simplified modelling scheme is employed allowing for the related optimization problem to be efficiently formulated and solved off-line. Simulation results are provided to illustrate the outcome...
Polynomial chaos is used to identify the uncertainty associated with the twelve-pulse AC/DC diode rectifier stage of aircraft power systems. The proposed stochastic average model is integrated within the overall power system model by means of nodal analysis and is suitable for the study of transients in the time domain. It is demonstrated that compared with the application of the Monte Carlo method,...
This paper presents a systematic method for modeling small-signal input impedance of line-frequency AC-DC converters. The objective is to develop proper models that can be used for stability analysis of AC power systems with significant DC loads powered by such converters. The proposed modeling method uses harmonic linearization and Fourier analysis techniques to describe the current and voltage mapping...
This paper presents a mathematical model and control design for the sensorless vector control of permanent magnet synchronous machines (PMSM). A detailed motor drive including three-phase PWM voltage-source inverter and PMSM and control system models are presented, providing insight into the frequency response based design of all associated loops, namely back-EMF state observer, rotor speed and position...
The small-signal modeling of single-phase power factor correction (PFC) converters is limited by the fact that it must deal with time varying AC variables; thus becoming a hindrance for controls design and dynamic interaction analysis. This paper proposes a modeling approach for the analysis of multiple single-phase PFC converters, achieved by aggregating them into a single equivalent three-phase...
This paper analyses different average models of multi-pulse diode rectifiers. In the analysis a full-order and a simplified average model are compared to a detailed switching model. The main goal is to establish the validity of the simplified model. First the different models are discussed. Then the small and large signal evaluations of the models are presented. The input impedance frequency response...
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