Shiraz UniversityIranian Journal of Science and Technology Transactions of Electrical Engineering2228-617939E220151201OPTIMAL SIZING AND SITING OF DG RESOURCES AT 63KV/20KV SUBSTATIONS CONSIDERING THE EFFECT OF EARTHQUAKE ON TECHNICAL AND ECONOMIC PARAMETERS133153348710.22099/ijste.2015.3487ENS.A. HOSSEINIDept. of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, I. R. of IranH. ASKARIAN ABYANEHDept. of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, I. R. of IranS.H.H. SADEGHIDept. of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, I. R. of IranF. RAZAVIDept. of Electrical Engineering, Qazvin Islamic Azad University, Qazvin, I. R. of IranM. KARAMITehran Power Transmission Maintenance Engineering Company (METANIR), I. R. of IranJournal Article20140428The Iranian Ministry of Energy commands the Regional Electrical Companies to install DG resources at 63kV/20kV substations and at the end of 20kV lines. The first and foremost challenge in installing these resources is deciding on the optimal place and capacity of these resources. This paper is aimed to propose an appropriate algorithm for siting and sizing such resources in Bakhtar Regional Electrical Company. The proposed algorithm takes into consideration all technical and economic factors important to the company. Due to the variety of important factors in sizing and siting, this paper proposes a new method to reduce limitations and constraints of this process. Accordingly, all technical and economic factors are assigned monetarily, so violating limitations reduces considered benefits. This method increases the probability of convergence of results and accordingly is appropriate for application in actual network where there are numerous factors. Another feature of this paper is considering the parameter of earthquake for the first time and is assigned monetarily according to its devastating effects on considered parameters. Applying this parameter while sizing and siting leads to increase in distributed generation impacts in reducing customer outage in locations with high probability of earthquake. The obtained results are reported and discussed.https://ijste.shirazu.ac.ir/article_3487_788c27d8542d3dc95bb2bd9c90b17b46.pdfShiraz UniversityIranian Journal of Science and Technology Transactions of Electrical Engineering2228-617939E220151201THREE PHASE ON-LINE UPS BY IMPLEMENTING T-SOURCE INVERTER WITH MAXIMUM CONSTANT BOOST PWM CONTROL209215349210.22099/ijste.2015.3492ENK. CHITRADept.of EEE, Bannari Amman Institute of Technology, Sathyamangalam, Tamilnadu, IndiaA. JEEVANANDHAMDept.of EEE, Bannari Amman Institute of Technology, Sathyamangalam, Tamilnadu, IndiaJournal Article20140211This paper presents the new topology of three phase on line Uninterruptible Power Supply (UPS) by employing T-Source Inverter (TSI) with maximum constant boost Pulse Width Modulation (PWM) control and the results are compared with the conventional Uninterruptible Power Supply (UPS). The conventional UPS consists of Voltage Source Inverter (VSI) with step up transformer or DC-DC booster which decreases the efficiency and increases energy conversion cost. The proposed three phase UPS with TSI has the voltage boost capability through shoot through zero state which is not present in the conventional VSI. This proposed UPS increases the efficiency due to single stage conversion, reduces the harmonics, increases the voltage gain and reduces the voltage stress. The performance of the three phase on-line UPS with TSI is simulated in MATLAB / SIMULINK software and the results are compared with conventional UPS. The simulation and the theoretical analysis are validated with experimental results.https://ijste.shirazu.ac.ir/article_3492_346dd6965e387884c8cc4f08ef5f828d.pdfShiraz UniversityIranian Journal of Science and Technology Transactions of Electrical Engineering2228-617939E220151201ORDER REDUCTION OF LINEAR SYSTEMS WITH KEEPING THE MINIMUM PHASE CHARACTRISTIC OF THE SYSTEM: LMI BASED APPROACH217227349310.22099/ijste.2015.3493ENG. KHADEMISchool of Electrical and Computer Engineering, Shiraz University, Shiraz, I. R. of IranH. MOHAMMADISchool of Electrical and Computer Engineering, Shiraz University, Shiraz, I. R. of IranM. DEHGHANISchool of Electrical and Computer Engineering, Shiraz University, Shiraz, I. R. of IranJournal Article20130212Model order reduction is known as the problem of minimizing the -norm of the difference between the transfer function of the original system and the reduced one. In many papers, linear matrix inequality (LMI) approach is utilized to address the minimization problem. This paper deals with defining an extra matrix inequality constraint to guarantee that the minimum phase characteristic of the system preserves after order reduction. To overcome this, poles and zeros of the reduced system transfer function must be at left-half plane (LHP). It is very easy to apply a LMI condition to force the poles of the system to be at LHP. However, the same cannot be applied to zeroes easily. Thus, a special state-space realization of the system is introduced in a way to apply conditions on zeros of the reduced system. The method is applied to some sample examples and the simulation results verify the performance of the proposed method.https://ijste.shirazu.ac.ir/article_3493_18224e441757a01dbd62665e3c87c051.pdf