Current Issue : July - September Volume : 2016 Issue Number : 3 Articles : 4 Articles
Loads in large scale industrial enterprises are always various and complex, causing insecure power\nquality. Meanwhile, some sensitive loads or precise instruments demand for high power quality.\nWhen voltage flicker or harmonics occurs, dynamic voltage restorer (DVR) can be used to stabilize\nthe load-side voltage, which is a good manner of improving power quality. The paper explains the\nload demand in large scale industrial enterprises, analyzes several common voltage compensation\nscheme of DVR, and comes up with another voltage compensation scheme of DVR applied for\ndouble power supply with double load. A Simulink model according to the new scheme is also built\nin MATLAB/Simulink to test its performance. Simulation results show that the proposed scheme\ncan guarantee the load-side voltage stability, which is an effective scheme for managing power\nquality....
With the wide application of non-linear loads\nand the large-scale access of distributed energy generations\nbased on power electronics equipments, power quality\nproblems in the distribution network are increasingly\nserious with new characteristics. Further in-depth research\nis of great significance in theory and practice. This paper\nprovides an overview of power quality analysis, compensators,\nand control technologies under the new situation of\nsmart grid. It focuses on the topologies and control methods\nfor power quality conditioners, especially new characteristics\nof power quality and applicable control\ntechnologies in microgrids and distributed power plants.\nFinally, trends and prospects of power quality control\ntechnology are introduced, which is important to achieve\nsecurity and efficient operation of the smart grid....
Microgrid (MG) integrated with Distributed Generation (DG) provides several benefits like reliable,\nsecure, and high efficient of energy supply, while minimizing power loss, deferring expansion\nof power distribution infrastructures, and reduced carbon emission of energy supply etc. to the\ncommunities. Despite of the several benefits, there are several challenges existing due to the integration\nof different characteristics and technology of DG sources in MG network. Power Quality\n(PQ) issue is one of the main technical challenges in MG power system. In order to provide improved\nPQ of energy supply, it is necessary to analyse and quantify the PQ level in MG network.\nThis paper investigates the detail of PQ impacts in a real MG network carried out through an experimental\nanalysis. Voltage and frequency variations/deviations are analysed in both on-grid and\noff-grid mode of MG operation at varying generation and varying load conditions. Similarly unbalance\nvoltage and current level in neutral are estimated at unbalanced PV generation and uneven\nload distribution in MG network. Also current and voltage THD are estimated at different PV\npower level. Finally the results obtained from the analysis are compared to that of Australian\nnetwork standard level....
Electron cyclotron resonance heating (ECRH) system is one of the most important Tokamak auxiliary\nheating methods. However, there are growing demands for ECRH system as the physical experiments\nprogress which meanwhile adds the difficulty of designing and building the control\nsystem of its power source. In this paper, the method of designing a control system based on Single\nChip Microcomputer (SCM) and Field Programmable Gate Array (FPGA) is introduced according to\nits main requirements. The experimental results show that the control system in this paper\nachieves the conversion of different working modes, gets exact timing, and realizes the failure\nprotection in 10us thus can be used in the ECRH system....
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