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This paper investigates the structural R-controllability problem for generalized linear switching systems. Causal manipulations on the bond graph models are carried out in order to determine graphical conditions for structural R-controllability.
The envelope-following (EF) simulation of practical DC-DC converters is challenging due to the presence of digital behavior, strong nonlinearity, complex frequency module schemes and feedback loops. This paper presents a novel EF method for time-domain analysis of DC-DC converters based upon a numerically robust time-delayed phase condition to track the envelopes oaf circuit states under a varying...
Due to the presence of the low-order background voltage harmonics in the grid, it will cause higher current harmonics in the AC side of the grid inverter with Selective Harmonic Elimination PWM (SHEPWM). Therefore the grid inverter with traditional SHEPWM has not prevailed since it is unable to overcome the background harmonics of the utility and satisfy the power quality requirement. In this paper,...
This paper proposes a new modeling method for buck converter. The new modeling method, named bi-switching status method (BSM), for buck converter is obtained via the propositional calculus and linear constrain. Based on the mixed logical dynamical (MLD) model, BSM model of buck converter is obtained. Compared with other modeling methods, such as MLD method and state-space averaging method, streamlined...
AC-AC power converters are becoming essential in most of modern power systems and industrial applications. This conversion is usually done using a traditional converter which consists of a rectifier and an inverter separated by a storage component. During the last two decades, matrix converters gained the researchers attention as an alternative to traditional converters thanks to the advantages they...
As for high power plasma power supply, due to high efficiency and flexibility, multi-channel interleaved multi-stage paralleled Buck DC-DC Converter becomes the first choice. In the paper, two-channel interleaved two- stage paralleled Buck DC-DC Converter powered by three-phase AC power supply is selected as research subject, dedicated for the use of plasma cutting machine of 2×45kW, and the passivity-based...
This paper details efficiency optimized operation and design of a bi-directional and isolated five-level Dual Active Bridge (5LDAB) converter for an application that requires ultra-wide voltage and power ranges. The rated power of the considered converter is 7.5kW, the specified input voltage range is 150V ≤ Vdc1 ≤ 800V and the output voltage is constant, Vdc2 = 700V. In order to achieve high efficiency...
Since the loss of input rectifying diode bridge in the conventional PFC converter reduces the efficiency, the bridgeless PFC converter has been proposed. The totem-pole bridgeless PFC converter is the most representative one. However the common mode noise current occurring around the input voltage zero-crossing brings severe EMI problem restricts its practical application. In order to improve noise...
In order to increase the output voltage range of photovoltaic panels, battery and fuel cell monomer efficiently in the distributed generation system, In this paper, a novel Z-source high step-up boost converter is presented. With a unique X-type Z-source network, clamping voltage of pump capacitor is improved. The proposed converter achieves a high voltage gain without an extremely switch duty cycle...
A novel high step-up DC-DC converter is proposed in this paper. In this paper, interleaved inductors are utilized to combine with switched capacitors to generate a simple circuit structure. This topology aims to reduce current stress in low-voltage side further, decrease voltage stress in high-voltage side, and to achieve output voltage regulation with a wide range input. The operating principles...
Multilevel inverters are one of the most popular and useful type among all and have lots of usage like less disturbance and the possibility to function at higher switching frequencies than ordinary two-Level inverters. They can be used at different applications like electronic derivers, wind turbines and solar plants. In order to feed the DC current produced by PV panels to the inverters, power electronic...
Three-level neutral point clamped (NPC) inverter topologies are becoming more and more the interest of studies, especially in grid connected systems, due to their advantages compared to other multilevel inverters. Synchronization with an AC source remains a challenge ring current injection to the grid. In order to enhance the performance and the immunity of such grid connected inverters, a sliding...
The paper deals with left invertibility problem for nonsmooth systems, the illustrative case is a data secure transmission, but this problem occurs also in fault detection, parameters estimation and control design from a desired output behaviour. Here the left invertibility problem is treated on the basis of a nonsmooth chaotic system, the well known Alpazur circuit. It is associated to its dynamic...
For a constant on time controller to be stable with all ceramic output capacitance, a virtual ESR (Equivalent Series Resistance) circuit is needed to inject the required ripple voltage into the FB (Feedback) node. This paper proposes a new stability criterion, which is that the FB node ripple voltage need to have the same phase as the inductor current and have certain amplitude to filter out noise...
Nowadays autonomous robots are used in many filed of agriculture for increasing efficiency, and especially reducing the cost of the scarce human labor. Mobile ground robot and flying drone can be used to survey the farmland collecting necessary information such as ambient and crop conditions, soil fertility, pest and disease, etc. In this work, we have implemented an electronics nose (e-nose) based...
The linear quadratic optimal control problem for time invariant systems is presented. The problem with Unite final time and fixed end-point is considered. The study takes into account the influence of the time variant perturbations in optimal control law implementation. The applicability of the proposed algorithm is illustrated by simulation tests.
Switched Ethernet has been used widely in industrial applications because of its high speed and deterministic characteristics. This paper proposes an enhanced network recovery (ENR) scheme based on switched Ethernet to handle network failures in the naval combat system. In this study, network failure recovery is explained through message scheduling on switched Ethernet, which is based on previous...
An optimal control problem is proposed and studied for a system of ordinary differential equations from population dynamics. The system models a general ecosystem of several species. One introduces some control variables in the system and one associates an optimal control problem. The control variables represent the mixture rates between the species. Pontryagin maximum principle is established for...
Photovoltaic (PV) systems have become a popular type of distributed generation units (DGUs) for small and medium levels of renewable energy generation. These DGUs are designed and operated to deliver electric power through one or more stages of power electronic converters (PECs). The non-linear and switched natures, along with control actions, of PECs used in PV systems can be of major influences...
The growing interests in clean and sustainable electric energy push towards increasing the interconnection of wind energy conversion systems (WECS) to utility grids. Designs of the majority of WECSs employ power electronic converters (PECs), which generally have non-linear and switched characteristics. The characteristics, operation, and control of PECs in WECSs can result in non-conventional current-voltage...
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