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The paper proposes a hybrid droop control strategy to enhance the stability and increase maximum constant power loads (CPLs) capability of DC microgrids in a realistic scenario. By capturing the detailed model of inner control loops and hybrid droop control and general dc MG topology, a thorough comparative study is conducted between traditional droop control and hybrid droop control. Enhanced control...
This paper proposes a real time scalar control of induction motor by using RT-LAB software. This method of control leads to be able to adjust the speed of the motor by control the frequency and stator voltage magnitude, the ratio of stator voltage magnitude to frequency should be kept constant, which is called as scalar control of induction motor. The real-time scalar control algorithm is designed...
This work-in-progress research study examines the response patterns of first-generation college students (FGCS) to the engineering identity measures compared to non-first-generation college students (non-FGCS). This work answers the following research question, “Do FGC and non-FGC engineering students interpret the engineering identity measurement items in a conceptually different manner?” We explore...
Recently, the self-blast principle of extinguishing the arc by the blast pressure which is generated by the arc itself has been widely applied to the high voltage circuit breaker. In the self-blast principle, the pressure relief valve fitted on the piston is opened to release excessive pressure in the compression volume during high current interruption. The design of the pressure relief valve operation...
The single event transients (SETs) are a common source of malfunction in nano-scale CMOS integrated circuits. For this reason, evaluation of the SET effects and application of appropriate measures for their mitigation are fundamental tasks in the design of advanced radiation hardened integrated circuits. In general, SET analysis is based on the multi-scale modeling and simulation approach comprising...
This paper is concerned with the design of a robust position Backstepping tracking controller for a permanent magnet synchronous motor (PMSM). A Backstepping control law is designed from the input-output linearization of the PMSM model, written in d-q coordinates. This controller is adapted via the estimation of the unknown load torque and friction effects. A linear extended state observer is devised...
A design of a feed-forward-based fractional-order model reference adaptive control (FO-MRAC) compensator using a modified MIT rule to control a DC-DC boost converter is presented in this work. As the plant is non-minimum phase, an implementation of the so-called parallel feed-forward configuration is required to make the plant satisfy ASPR (almost strictly positive real) conditions that in turn, allows...
Machine learning is currently a hot research topic and applied in intelligence transportation system to discover new valuable knowledge and patterns. In this paper, we extract trajectory information from popular traffic simulator and apply it into four different machine learning methods. In the case of the Gangnam district in Seoul, the Gradient Boosting Regression has better fit with lower values...
To correctly engage in the instrument development process takes time. According to Benson's model of construct validation (1) there are at least three lengthy stages (substantive, structural, external) to construct validation when developing a new measure. This study examines how instrument structure impacts the validation process and what it can tell us about instrument revision. In this study we...
A spatial load forecasting method based on unstructured information processing and multi — attribute depth learning is proposed. In order to solve the problem that the unstructured attributes have great influence on the load density but can't be directly put into calculation, the natural language processing (NLP) technique is used to structure those attributes. In view of the on characterization of...
This paper approaches the topic of robust control for DC-DC power converters. A low-power single-ended primary-inductor converter (SEPIC) has been chosen as a case study, for which the output voltage regulation problem in presence of parameter uncertainties is stated in the Hinf formalism as a disturbance-rejection problem. This approach is assessed by numerical simulations in MATLAB against a classical...
This paper presents the joint Arrhenius-Weibull model as a new transmission line failure model as a result of operating under higher loading temperature due to DTR system application. The proposed model takes into account the effects of the line natural ageing (end-of-life) and its operation at higher loading temperature. The proposed model is compared with the conventional line ageing model that...
The impacts of distributed generation (DG) units on the unbalanced three-phase power systems are analyzed. Line loss mathematic model caused by harmonic with unbalanced three-phase loads is proposed through theoretical derivation. The corresponding simulation model based on typical 10kV medium voltage microgrid is established with Matlab/Simulink. The simulation results show that an optimal grid connection...
The large-scale un-coordinated charging electric vehicles(EV) will reduce the quality and reliability of power grid significantly. Centralized control can achieve the coordinated charging of EV. But cost of construction and maintenance of control system is increasing with the development of EVs. For the scattered distribution of EV, distributed control is more convenient to be realized. A coordinated...
The structure and working principle of hybrid energy storage system are introduced. The classical RC model of ultracapacitor is analyzed, and the topology of charging and discharging converter of energy storage system is studied. A ultracapacitor-battery hybrid energy storage system model based on bidirectional boost-buck circuit is constructed, and the charging and discharging process of the energy...
The paper proposes a novel voltage event-triggered P-U control strategy for improving related active power sharing accuracy in low-voltage microgrid (MG). Active power sharing inaccuracy is associated with voltages difference of distributed generation units (DGs) that is basically attributed to mismatched lines impedance. So the inaccuracy is inevitable. The proposed voltage control strategy contains...
The fundamental roots of micro-grids are different types of renewable energy sources. There are two broad and distinctive control set ups for power systems. They are centralized and decentralized (hierarchical) controls. In market models of micro-grids there are normally groups of electricity sources and loads that operate in synch with a centralized grid or macro-grid. This paper studies the functionality...
In order to bring the simulation system closer to the actual locomotive run properties, ease to observe locomotive system response in real-time. The fuel cell hybrid locomotive system established in this paper, consists of 150 kW proton exchange membrane fuel cell (PEMFC) power generation system, DC/DC converter, battery energy store system, three-phase asynchronous traction motor, etc. And designs...
With the cross regional interconnection of the power grid, it is more and more inconsistent with the actual development of the power grid to use a single sandpile to simulate the power grid. The multi-sandpile model is developed to simulate the evolution process of the whole power grid failure in the form of all the single sandpiles evolving synchronously. First of all, the modeling method of multi-sandpile...
Authors have proposed a printed inverted-F antenna (PIFA) for circular polarization. In this paper, an approach to improve the bandwidth is investigated. It is shown that the bandwidth can be widened by designing the rectangular element loaded at the feeding line as short as possible. The redesigned PIFA in this paper has approximately twice (210MHz) the bandwidth of the 3dB-axial ratio with a 10dB-return...
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