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A microgrid (MG) is a cluster of loads and distributed generation units (DG) that are located in a close distance from each other. In a dc MG, the DGs generate a dc voltage and the loads consume power while supplied by a dc voltage. The power sharing amongst DGs is one of the main control issues in dc MGs. Power sharing is conducted in either form of load current or power sharing; however, many of...
This paper summarizes the results of a three-phase load flow analysis case study. This work was part of an overall energy systems modeling and analysis effort designed to develop a validated power flow study that facilitates understanding of power flow concepts for the present distribution networks operating in asymmetry conditions. To simplify data collection requirements and illustrate key concepts,...
Due to the increase of the train velocity, the pantograph-catenary arc occurs even more frequently, which results in severe erosion on the pantograph pan and the catenary wire. This leads to a serious threat to the normal operation of the pantograph-catenary system. As the level of the arc erosion has a close relationship with its energy, it is necessary to study the influencing factors and suppression...
The aim of this paper is to present a graphical user interface (GUI) toolbox that has been developed for the GridLAB-D simulation platform. The toolbox provides the users with a friendly interface facilitating the design and simulation of experiments related to the operation of the electric power grid. The GUI, which is named MatGridGUI, integrates GridLAB-D platform with the Matlab software functions...
It the era of renewable energy. Now a days a lot of works being done on renewable source of energy as these are the free energy which is nonpolluting and flexible to use. Out of the regenerative sources of energy solar energy is plentiful in nature and freely available which the main criteria to use it is. But solar energy to electrical energy conversion efficiency is very low. But still solar energy...
Usually, electrical design engineer must take care about three-phase balancing before sending the final version of the LV electric wiring. The conventional method used to verify this task was just to divide all single-phase electrical-loads between the three phases without focusing the consideration on daily load-flow variation of the electrical-loads. For this, this paper describes a necessary new...
This paper aims to highlight the possibility of interactively determining the performance of dynamic systems using virtual instrumentation which include Matlab scripts, so as through this combination it can obtain the of virtual tools that work as simulators for certain systems or processes.
This paper presents the options for determining power losses in the system consisting of indirect frequency converter and induction machine. A mathematical model for calculation of individual losses in machine as well as in converter is presented herein. The model allows the determination of losses both in steady states and in the course of transients, e.g. starting, braking, load change. The model...
In today's electricity market, the power supply enterprises have to face power quality problems. The reducing of power system frequency threaten the safety of power grids. At this time, we have to use the Under Frequency Load Shedding(Hereinafter referred to as the UFLS) device to remove partial load, to restore the system frequency within the level of security. UFLS device, therefore, the correct...
Due to the randomness and intermittent characteristics of wind energy, the integration of wind farm may have many negative effects on the operation of the distribution networks. In this paper, a scenario-based evaluation framework is established for the theoretically analysis of influences introduced by the uncertainties of wind power integration. Then, a set of well designed evaluation indexes are...
Now a day's Brushless DC motor (BLDC) and DC motors are being used in most of the Electrical Vehicle. Switched Reluctance Motor (SRM) may become best alternative to BLDS and DC motor in this area because of its constant power output capability, good thermal management and fault tolerance capability. Furthermore SRM having advantages of low weight, high efficiency, small size, low cost and high torque...
Mathematic model of the funnel-shaped cooler hydraulic system is worked out by MATLAB/Simulink in order to simulate its dynamic behavior in the timer. According to the simulation results, what lead to the hydraulic pipeline connected with flange burst are carefully analyzed. Finally, optimize scheme is put forward and practiced successfully in enterprise production.
Research on dynamic behavior of the PEM (proton exchange membrane) fuel cell is very important to understand the operating mechanism, optimization fuel cell structure and the systematic integration. The paper was based on the distributed-parameter model and lumped-parameter model. Distributed-parameter model include conservation equations, and lumped-parameter model is based on electro-chemical model...
In recent years the simulation tools have been optimized for precise modelling and simulation for their special purpose. Therefore the simulation tools have been developed to model and simulate a certain problem. In the past, the hardware was used to be modeled in a SPICE simulator, the software in a signal and differential equation based simulator. Nowadays the investigated systems are decreasingly...
The problems about load control system of combine and its hardware implementation are discussed. The load control system based on intelligent fuzzy control is set up. The controller is simulated on MATLAB/SIMULINK. A hardware implementation about load control system of combine based on VHDL and FPGA is proposed. According to top-down mode, the VHDL modular design of the controller is carried out,...
Based on research of the phase plane division control method, according to the structure of wheel loader steer by wire system and its work condition, the fuzzy five states control system specially designed for wheel loader steer by wire system is introduced in this paper. To verify its performance, the controller was simulated in MATLAB/SIMULINK based on the model of wheel loader steer by wire system...
This paper represents a novel reference compensation current estimation method for control of shunt active power filter (APF). The method allows the reference compensation currents are determined in the a-b-c reference frame and there is no reference frame transformation requirement, so the proposed system becomes very simple. The current control is done in time domain. The compensating current flows...
This Use power bond graph theory to model forward shift hydraulic system of the 50 wheel loader, using the relationship between of bond graph and block diagram, to transform the forward shift hydraulic system model into block diagram model. In Matlab / Simulink software platform to build simulation model and simulate the model, the forward shift of the response curve of the pressure was obtained.
In order to ensure the electricity output quality of one turbocharged diesel generator set under pulsed load, some measures were taken to control the speed regulating rate of original power machine. One main reason causing the big diesel speed regulating rate in experiment is the lack of air for combustion in the early period of pulse. The other reason is that the energy stored by set shafting parts...
It is an irresistible trend of the electric power improvement for developing the smart grid, which applies a large amount of new technologies in power generation, transmission, distribution and utilization to achieve optimization of the power configuration and energy saving. As one of the key links to make a grid smarter, load forecast plays a significant role in planning and operation in power system...
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