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In this study, the input filter design and dc-bus voltage control of ac motor drives utilizing low capacitance film capacitor are investigated. The dc-bus voltage instability problem arising due to the resonance between the dc-bus capacitor and circuit inductances is explained. A dimensioning algorithm of dc-bus filter components for stable operation is given. The simulation results of the low capacitance...
In this paper, the performance behaviour of a symmetrical higher phase order (hpo) squirrel-cage induction machine is carried out. The machine stator winding is connected to a balanced phase supply and the machine performance characteristics observed during normal operation in loaded and unloaded conditions. The hpo squirrel-cage induction machine is investigated using the generalised theory method...
The most industrial applications use the variation of the torque, speed and/or position in process, for which extremely severe specifications are needed. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. One thus tries to make fulfill the speed measurement by implementing in a Digital...
This paper presents an initial start-up and magnet polarity estimation method for PMSM using the alternating HF test current injection based sensorless control scheme for low speed range and evaluation of the saturation dependent HF d-axis inductance. The proposed magnet polarity estimation method consists of two steps: The first step is to activate the HF injection based sensorless current control...
The increasing global energy needs have led to the realization of interconnectors to strengthen regional electricity systems. As interconnectors are often placed offshore, combining those with wind farm grids can increase profitability compared to separate infrastructure and improve the grid integration, offering higher security of supply and controllability. However, a systematic approach for selecting...
In the recent years, the use of clean energy to reduce pollution and hence to save the environment is an urgent need to keep the communities against the dangers that began to show with huge negative consequences. This paper illustrates with full details how to built DC scooter which can be used with solar cells to charge the DC batteries used to drive the scooter safely, economically and with negligible...
Surveillance systems are evolving and analog cameras give way to IP cameras, wireless sensors are used in home surveillance, remote mobile phones access to video surveillance is current practice, but the concept itself, of “surveillance systems”, has not evolved accordingly. Control rooms are still the heart of operations, where several security guards spread their attention over an array of monitors,...
The widely used energy storage system for electric vehicle and electric operating machine based on battery has critical disadvantages. A solution for this problem is the use of battery/Supercapacitor (SC) hybrid energy storage system (HESS) due to advantages of SC in high power density, high cycle capability, and long life time. However, energy density of electric energy storage is much lower than...
The induction machine in the operating mode of generator is a very valuable alternative to the synchronous machines. Especially in lower nominal power rating range, such solution can be more cost effective. Induction machine with a squirrel-cage rotor cannot generate a reactive power and even more it is a permanent consumer of the reactive power. In this paper, we strive to define theoretical limits...
This paper presents design guideline of portable emergency power supply with multi input and output requirements. The available structures which satisfy design considerations are proposed and analyzed. Based on the chosen structure, suitable topology and controller of each part applied to charge a battery in a wide range of input condition. In addition, system operation algorithm is proposed according...
In this paper, a fuzzy sliding mode control algorithm is proposed to improve performances of a variable speed wind energy conversion system (WECS) connected to the grid. To reduce the converter size, a doubly fed induction generator (DFIG) is used. Using a DFIG offers also the possibility to its stator active and reactive powers to be controlled independently. The active power reference is obtained...
Based on the Westerlund-Ekstam model, the paper presents an estimation of power losses in an elementary switched supercapacitor circuit. The power losses are found analytically and represented in the form of equivalent resistance. It is shown that as compared to an ideal capacitor, the use of supercapacitor is preferred at low switching frequency, f <1/(5RC). In addition, a straightforward method...
Nowadays, rotating machines (RM) plays an important role in industry. Therefore detection a precise faults in main part of RM will avoid non programmed stops of production by real time management of machine status. Different detection methods using vibration signature analysis, noise signature analysis and lubricant signature analysis were presented in literature reviews however there is no much techniques...
Communicating high frequency control signals over a power lines is well known and getting popular day by day. This technique is known as power line communication (PLC) and mostly used to control the loads in short distance. In this study, authors present to control a DC motor over a power line. For this purpose, a transmitter and receiver have been used on the power line. High frequency control signals...
This paper proposes a new control structure for two feeders, three phase four wire distribution systems (3P4W) operating with multi-converter unified power quality conditioner (MC-UPQC). The modified synchronous reference frame theory (MSRF) is mainly used in the new controller design. The proposed system is designed and applied for two feeders of 3P4W with UPQC. This system employed with three voltage...
This paper describes and demonstrates the effect of a PI controller in a novel design of a dynamic voltage restorer (DVR) which mitigate power quality problems like sags, swell, and phase jumps by injecting minimum active power in system and provides the constant power at load side without any disturbance. Along with PI controller the design of this DVR presented here includes the combination of PWM-based...
An analytical solution in a closed form of the B4 converter working with a proposed optimized half a period switching symmetry is presented. The proposed switching strategy provides a good current tracking capability and minimum switching frequency. The analytical solution may be applied for the B4 converter connected to highly unbalanced grids. The method enables to analyze quickly B4 converter current...
Among renewable energy systems, a great deal of research has been conducted especially on photovoltaic effect and fuel cell in the recent day. The paper introduces hybrid photovoltaic-fuel cell system for supplying power charges for integration in the isolated site or an autonomous integration taking into account the enhancement of the sustainable energy. The renewable sources of the hybrid power...
The the article the issues associated with the use of fuzzy logic in a non-linear Kalman filter working in adaptive control structure of the dual mass system are presented. In the introduction, a brief review of the literature is done. Then the mathematical model of the drive system is shown. Next, the control structure and the fuzzy extended Kalman filter is presented. The adaptation of the coefficients...
Fault diagnosis in PFC rectifiers is becoming more and more important in many industrial applications. PFC rectifiers allow high power factor operation in AC/DC conversion. This power converter is normally the first interface between the ac power system network and the electronic equipment. In this way a good diagnosis system can avoid unplanned standstill. Under this context, this work presents a...
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