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Increasing energy demand, environmental pollution and global warming are the main factors that increase the tendency towards renewable and clean energy resources. Energy derived from fossil fuels is not sustainable due to limited resources. Climate change and energy security have forced governments around the world to adopt policies to extend the share of clean energies considering greenhouse gas...
In high power and high dynamics applications (such UPS or Welding Machine) to reduce line current harmonics, power factor correction PFC regulators are essential. This paper presents an innovative control law for a single-phase PFC boost converter. This kind of system is a nonlinear behavior. Classically, to control the voltage and the current in the converter, a linearized technique is often used...
This paper presents an innovative control law for permanent magnet synchronous motor (PMSM) drive for high dynamics applications. This kind of system (three-phase inverter connected with a PMSM) exhibits nonlinear behavior. Classically, to control the speed and the current (torque), a linearized technique is often used to study the stability and to select the controller parameters at specific operating...
Recently, the model based control has been successful applied for motion control applications. It improves better performance than a classic linear control. However, a model base control needs to know some parameters for exact estimations, here a load torque and stator resistance. In this paper, it presents three-observers for a differential flatness model based control approach for a DC permanent...
This paper proposes a cascade voltage/current control method (vector control) for a three-phase inverter for grid connected applications. The study mainly focuses on the innovative control law based on the flatness properties for a three-phase inverter with output LC filter. Utilizing the flatness principle, we propose simple solutions to the control and stabilization problems. The effectiveness of...
This paper introduces a nonlinear control scheme based on the differential flatness approach for controlling the speed/torque of a permanent magnet synchronous motor (PMSM) drive. The differential flatness estimation is a model based approach. Then, two state-observers are proposed to estimate a load torque disturbance and a stator resistance (represent losses in an inverter and PMSM) by means of...
Multilevel inverters supplied by independent sources are increasingly studied to connect these sources to grid. One of the challenges is voltage balancing. Indeed, when supplying powers coming from renewable sources are different, the inverter input voltages are unbalanced. In this paper, a stable DC bus voltage balancing technique without modifying MPPT algorithm is presented. This allows an MPPT...
Recent advancements in stability analysis of DC microgrids have enabled optimized system designs with reduced sizes of passive elements and improved performance of regulators. Reduced size of passive elements provides savings in cost, weight, and space which is of special interest in electrified transportation systems. However, smaller capacitance for DC-link may make the system more susceptible to...
The design, implementation, and control of rotor topology for an interior permanent magnet synchronous motor (IPMSM) is presented in this paper. The method is an arrangement of buried magnets in a flux concentration structure, combined with Pulse Width Modulation (PWM), which act on the iron core of the rotor, known as the PWM-rotor. The unsatisfied harmonic contents of the flux density in the air-gap...
In this paper a balancing control of the dc input voltage of a 3-Level and 5-Level Neutral Point Clamped Inverters (3L-npc and 5L-npc) is proposed. In renewable applications and injection to AC bus, are often used boost converters and inverter. The proposed control allows independent MPPT for each source in a Distributed-MPPT (DMPPT) configuration. It is known that the DMMPT offers improvements in...
In this paper, a hybrid method is proposed for maximum power point tracking (MPPT) of solar photovoltaic system. This method combines three point-weight and Fuzzy Logic Control (FLC) methods. First, the direction of change in the voltage or no change compared to the state before is determined based on three point-weight method. Then a change in the voltage magnitude is done based on FLC. Three point-weight,...
Flatness systems comprise controllable linear systems, as well as nonlinear systems by static and dynamic feedback call endogenous dynamic feedback. Systems which are differently flat have several advantages which can be utilized to generate effective control strategies for nonlinear systems. In order to highlight the improvement of this control method, this paper provides an overview of this approach...
This paper proposes an average modeling of LED dimming circuit controlled by a indirect sliding mode technique. Circuit and control parameters that affect an LED dimming system's stability are studied. The dimming circuit comprises an output-capacitor less buck converter and strings of LEDs as load. The advantages of this topology are: low-part count and increment of system lifetime. This dimming...
In this paper, the predictive based reliability analysis of an electrical hybrid distributed generation (EHDG) is presented. The effect of a battery bank, as an electrical storage system, is investigated on the reliability of a distributed generation system (DGS) which forms an EHDG with a photovoltaic system as the main source. More precisely, to solve the problem of the intermittent nature of the...
Global warming, increasing of energy demand, depletion of fossil fuel resources and therefore, higher energy costs are the key factors that make wise utilizing systems, which are more reliable and environmentally friendly. Meanwhile distributed generation (DG), such as renewable energy systems and combined heating, cooling and power system (CHCP) plants, play an important role in this context. Compare...
This study presents an energy management approach for a hybrid energy system comprised of a photovoltaic (PV) array and a polymer electrolyte membrane fuel cell (PEMFC). Two storage devices (a Li-ion battery module and a supercapacitor (SC) bank) are used in the proposed structure as a high-energy high-power density storage device. Multi-segment converters for the PV, FC, battery, and SC are proposed...
The authors present a new design of rotor shape of interior permanent magnet motor. Improvements of the flux concentration combined with the Pulse Width Modulation (PWM) method are applied in this article. The significantly selected harmonic contents of the air-gap flux density are reduced by this technique. Therefore, an obtained back Electromotive Forces (EMF) are of better quality. The essential...
In this paper, a global study in terms of control architecture is applied to parallel voltage-source inverters topology with common DC bus under healthy and faulty operation mode, which represents very interesting advantages for industrial applications. By paralleling several units, the power supply system is able to meet high power requirements and the possibility of maintenance during the operation...
This study presents energy management approaches for a fuel cell (FC) power plant for autonomous system applications. Two storage devices (supercapacitor (SC) and Li-ion battery) are used in the proposed structure. Linear proportional-integral (PI) and nonlinear flatness-based controllers for dc bus stabilization for power plants are compared. Experimental results with small-scale devices [namely,...
A proposed parallel power converter with interleaving algorithm is chosen to boost a low dc voltage of photovoltaic (PV) to a dc bus utility level and then follows by inverter. Converters are controlled by interleaved switching signals, which have the same switching frequency and the same phase shift. By virtue of paralleling the converters, the input current can be shared among the cells or phases,...
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