Donghyeon Lee, Seungwan Son, and Insu Kim, " Optimal a llocation of l arge- c apacity d istributed g eneration with the Volt/Var c ontrol c apability u sing p article s warm o ptimization, " Energies, Vol. Haesung Jo, Jaemin Park, and Insu Kim, " Environmentally constrained optimal dispatch method for combined cooling, heating, and power systems using two-stage optimization, " Energies, Vol. Insu Kim, "A New Single-Logarithmic Approximation of Carson’s Ground-Return Impedances-Part 1," IEEE Access, Vol. Insu Kim, " The Expected Values of Self- and Mutual Impedances of Overhead Lines and Impacts of on Sags and Phase Conductor Imbalances: Part 2 ," IEEE Access, Vol. Jaemin Park, Haesung Jo, Insu Kim, "The selection of the most cost-efficient distributed generation type for a combined cooling heat and power system used for residential customers," Energies, Vol.14. Seung-Wan Son, Dong-Hyeon Lee, Insu Kim, Changhyun Chung, Hyoungkwon Kim, Dongjin Yoon, Joohan Lee, "A New Design of the Objective Function for the Optimal Allocation of Distributed Generation with Short-Circuit Currents," Journal of Electrical Engineering & Technology, Vol. Kwonchul Kim, Youngjae Kim, Beopsoo Kim, and Insu Kim, "A Study on Optimizing Underground Cable Maintenance and Replacement Cycles," Journal of Electrical Engineering & Technology, Vol.18, No. Insu Kim, Beopsoo Kim, and Denis Sidorov, "Machine Learning for Energy Systems Optimization," Energies, Vol. Beopsoo Kim and Insu Kim, "A case study of stand-alone hybrid power systems for a data center using HOMER and DIgSILENT," Energy Reports, Vol. Swing Equation for Multimachine System p.(Accepted) Jiyeon Jang, Dohun Kim, and Insu Kim, "Singularity handling for unbalanced three-phase transformers in Newton-Raphson power flow analyses using Moore-Penrose Pseudo-inverse," IEEE Access, 2023.δ and ω s are in electrical radian p.u p.u H=machine inertia constant.BUS VOLTAGES AND LINE CURRENTS DURING FAULT.DOUBLE LINE TO GROUND (LLG) FAULT Consider a fault between phase b and c through an impedance z f to ground.LINE TO LINE (LL) FAULT Consider a fault between phase b and c through an impedance z f.SINGLE LINE TO GROUND FAULT Consider a fault between phase a and ground through an impedance z f.SEQUENCE NETWORK FOR LOAD positive sequence network negative sequence network Zero sequence network.SEQUENCE NETWORK FOR TRANSFORMER positive sequence network negative sequence network Zero sequence network.SEQUENCE NETWORK FOR TRANSMISSION LINE positive sequence network negative sequence network Zero sequence network.RELATIONSHIP BETWEEN UNBALANCED VECTORS AND SYMMETRICAL COMPONENTS Similarly we can obtain for currents also.GAUSS SEIDAL METHOD For load bus calculate |V| and δ from V p k+1 equation For generator bus calculate Q from Q P K+1 equation.BUS ADMITTANCE(Y BUS) MATRIX Y BUS can be formed by 2 methods 1.Inspection method 2.Singular transformation Y BUS =.= Leakage impedance measured in 2 o with tertiary short circuited and 1 o open and referred to primary = Leakage impedance measured in 1 o with tertiary short circuited and 2 o open. = Leakage impedance measured in 1 o with 2 o short circuited and tertiary open.calculation of 3 winding transformer Zp=Impedance of primary winding Zs’=Impedance of secondary winding Zt’=Impedance of tertiary winding Short circuit test conducted to find out the above 3 impedances REACTANCE DIAGRAM FOR THE GIVEN POWER SYSTEM NETWORK.per unit=actual value/base value Let KVA b =Base KVA kV b =Base voltage Z b =Base impedance in Ω. MODELLING OF INDUCTION MOTOR =Resistance representing load =Equivalent resistance referred to stator =Equivalent reactance referred to stator.MODELLING OF TRANSMISSION LINE Π type T type.MODELLING OF TRANSFORMER =Equivalent resistance referred to 1 o =Equivalent reactance referred to 1 o.MODELLING OF GENERATOR AND SYNCHRONOUS MOTOR 1 Φ equivalent circuit of generator 1 Φ equivalent circuit of synchronous motor.EE1352 POWER SYSTEM ANALYSIS R.KALAIVANI EEE DEPARTMENT RAJALAKSHMI ENGINEERING COLLEGE RAJALAKSHMI NAGAR,THANDALAM 602 105.
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