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Voltage sag triggered by thunderstrike or short circuit could result in false tripping of AC contactor. Serious consequences, such as unintended shutdown in consecutive industrial manufacturing, would be caused subsequently. Thus, an uninterrupted switching topology of voltage sag protection for AC contactor is proposed in this paper. The proposed topology utilizes the reverse external voltage turn-off...
DC protection is designed based on the DC system and its fault features. DCCB based or converter based protection solutions are different in protective devices and protection coordination methods. Equivalent inductances can be used to estimate DC fault features and the mutual impacts between the protection and system design. Fast fault interruption is essential and critical to DC distribution protection...
This paper presents a decentralized technique based protection and control scheme for the active radial distribution network. A partitioning method for radial distribution network with multi-distributed energy resources is developed considering island operation possibility of DER, hence, the active distribution network is partitioned into zones with DER and zones without DER. Directional node configuring...
In this paper, the fault characteristics of different types of wind generators have been investigated. Three types of wind generators, namely Types 1, 3, and 4, along with a microgrid are simulated in both islanded and grid-connected modes using MATLAB/Simulink software. The fault current contribution and voltage at the PCC during the fault have been recorded for each type of the generators. The simulations...
To decrease the initial investment of the compensation system in distribution networks, this paper proposes a cascaded distribution static synchronous compensator (DSTATCOM) integrated with D-y connection distribution transformer for reactive power compensation. The cascaded H-bridge DSTATCOM is connected to a group vertex-taps on the primary windings of the D-y connection distribution transformer,...
This paper presents a systematic and comprehensive approach for differential mode (DM) EMI filter design in a three-phase boost-type power factor correction rectifier. Since the DM EMI filter forms a significant portion of the overall filter as well as converter volume, reduction of DM filter component size is kept as a major objective in the filter design process in order to improve the power density...
To improve the reliability of wind turbines, various condition monitoring systems (CMSs) have been developed and most of them transmit data using wired communication channels. Recently, wireless sensor networks (WSNs) have been used to transmit data in wind turbine CMS due to the low cost and easy deployment feature of WSNs. However, since wind turbines are installed in harsh environments, the sensors...
Someone passed by a street in the vicinity of a highlight building broken down might have caught in an unexpected big accident on site, to have caused him seriously injured. However, in rare cases, it is possible for any human to avoid big accident by taking an action of avoiding accident, perceiving the serious fear status. Responding to such status, we tried to apply an experiment of simulation...
After reviewing the equivalent circuit models of the LED, LED array, and the single-loop control CCM LED boost driver, this paper presents the compensator design approach for LED driver systems. The required compensator can be designed according to the subtraction of the magnitude and phase Bode diagrams of the existing open-loop gain from the desired loop gain. The open-loop gain can be obtained...
This paper presents a single-stage LED driver for street lighting applications with a novel bridgeless power factor correction converter. The proposed single-stage topology integrates a bridgeless PFC converter and a half-bridge CLCL resonant converter by sharing active power switches. The bridgeless PFC converter here adopts two buck-boost circuits operating at discontinuous conduction mode to achieve...
This paper describes established new 3D display systems for completely satisfying the invisibility and readability at the same time in a code pattern to measure the depth map. Three-dimensional images to be demonstrated on the new 3D image display system will be generated on the blue channel with a help of the red channel in the following 3 steps. Firstly, high invisibility has been attained by changing...
High speed gearless and compact motors rotating at speeds above 10000 rpm are finding many applications nowadays. Design of the high speed motor is indeed a technological challenge. This paper presents novel design and analysis of a coreless axial flux permanent magnet motor for high speed, low power application. The proposed motor is designed to rotate at a speed of 30000 rpm. To achieve high reliability...
Generally, in wireless inductive power transfer (IPT) system the power is processed through multiple power transfer stages and this leads to lower efficiency and higher cost of the system. Recent research shows that the use of direct ac-ac converter in IPT system compensates these limitations significantly. However, one of the major challenge of IPT circuit with direct ac-ac converter is to achieve...
This study introduces a quantum-behaved lightening search algorithm (QLSA) to improve the search capability of every step leader to find a projectile position. The QLSA improves the indirect field-oriented fuzzy-PI controller technique to control a three-phase induction motor (TIM). The generated adaptive PI current control parameters and fuzzy membership functions (MFs) are carried to design induction...
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