Probabilistic Algorithms for Power Load Flow and Short-Circuit Analysis in Distribution Networks with Dispersed Generation

2013 ◽  
Vol 24 (3) ◽  
pp. 324-338 ◽  
Author(s):  
César Augusto Peñuela Meneses ◽  
Mauricio Granada Echeverri ◽  
Jose R. Sanches Mantovani
Keyword(s):  
Short Circuit ◽  
Distribution Networks ◽  
Load Flow ◽  
Circuit Analysis ◽  
Probabilistic Algorithms ◽  
Dispersed Generation ◽  
Power Load ◽  
Short Circuit Analysis

scholarly journals Fault Location Method Using Phasor Measurement Units and Short Circuit Analysis for Power Distribution Networks

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1294
Author(s):  
Ji-Song Hong ◽  
Gi-Do Sim ◽  
Joon-Ho Choi ◽  
Seon-Ju Ahn ◽  
Sang-Yun Yun
Keyword(s):  
Power Distribution ◽  
Fault Location ◽  
Short Circuit ◽  
Distribution Networks ◽  
Circuit Analysis ◽  
Power Distribution Networks ◽  
Location Method ◽  
Measurement Units ◽  
Stage 1 ◽  
Short Circuit Analysis

This paper proposes a fault location method for power distribution networks using phasor measurement units (PMU) and short circuit analysis. In order to improve the problems of the existing studies, we focused on several approaches as follows. First, in order to minimize the number of PMU installations, a fault location estimation of lateral feeders through short circuit analysis was presented. Second, unbalanced faults and impacts of photovoltaic (PV) were considered. The proposed method consists of two stages. In Stage 1, the fault location was estimated for the main feeder using PMU installed at the start and end points of the main feeder. Symmetrical components of voltage and current variation were calculated by considering the impact of PVs interconnected to the lateral feeders. If the result of Stage 1 indicated a connection section of lateral feeder on the main feeder, Stage 2 would be performed. In Stage 2, the fault location was estimated for the lateral feeder by comparing the results of the short circuit analysis and measurements of PMUs. The short circuit analysis was based on an unbalanced power flow that considered dynamic characteristics of the PV inverter. The proposed method was verified through various fault situations in a test system. For the applicability of the proposed algorithm to the actual system, a noise test was also performed.

scholarly journals Optimal over Current Relay Coordination of IEEE 9 Bus System using Mipower

2020 ◽  
Vol 8 (5) ◽  
pp. 1481-1485
Keyword(s):  
Power System ◽  
Short Circuit ◽  
Operating Time ◽  
Test System ◽  
Load Flow ◽  
Circuit Analysis ◽  
Main Function ◽  
Relay Coordination ◽  
Protective Relays ◽  
Short Circuit Analysis

The protective system plays a major role which has great effect on the power system operation. The modern interconnected power system consists of large numbers of protective relays and circuit breakers which constitute an integral part of the protective scheme. The main function of the relay is to sense and locate the fault and sends a command to the breaker to isolate the faulty element. The objective of the relay coordination is to provide primary as well as backup protection from any fault that is likely to occur in the power system. In this paper, overcurrent relay coordination is implemented on an IEEE 9 Bus test system using MiPower software for phase and earth faults. The Load flow analysis and the short circuit analysis on the IEEE 9 Bus test system is initially done followed by relay coordination. Fault MVA and Fault current data obtained from short circuit analysis enables us to obtain operating time of the relays used in the test system. The calculated value of operating time gives the coordinated operation of all the relays. The MiPower software has unique feature which is very useful in proper coordination of overcurrent relays.

scholarly journals RANCANGAN SISTEM SUPLAI DAYA DARURAT PADA PLTG TANJUNG UNCANG 2X35 MW

2020 ◽  
Vol 6 (1) ◽  
pp. 420-430
Author(s):  
Ali Mashar ◽  
Siti Saodah ◽  
Achmad Maulana Fathi
Keyword(s):  
Short Circuit ◽  
Flow Analysis ◽  
Load Flow ◽  
Circuit Analysis ◽  
Analysis Program ◽  
Diesel Generator ◽  
Load Flow Analysis ◽  
Short Circuit Analysis

Pada sebuah pembangkit listrik terdapat peralatan - peralatan vital tambahan (auxiliary load) yang tidak dapat terputus suplai dayanya baik dalam keadaan normal maupun  dalam keadaan darurat (suplai daya dari generator utama terputus). Sistem suplai daya darurat merupakan sistem yang bertugas mensuplai daya pada beban vital tambahan ketika keadaan darurat (emergency). Komponen utama dari sistem suplai daya darurat adalah Emergency Diesel Generator (EDG) berfungsi sebagai pensuplai daya pada sistem tersebut. Besarnya rating daya dari EDG ditentukan dari jumlah beban vital tambahan yang akan disuplai. Berdasarkan pertimbangan kebutuhan daya bebannya,  spesifikasi EDG yang digunakan pada PLTG Tanjung Uncang 2x35 MW adalah 1225 kVA dengan tegangan nominal 6,6 kV, frekuensi 50 Hz dan PF 0,8. Electric Transient and Analysis Program (ETAP) digunakan untuk memverifikasi data beban vital tambahan dan untuk melakukan simulasi load flow dan short circuit pada sistem. Simulasi load flow analysis dilakakan untuk mengetahui aliran daya yang mengalir pada jaringan, sedangkan short circuit analysis dilakukan untuk melihat arus gangguan yang  mengalir ketika terjadi short circuit (hubung singkat). Dari simulasi load flow analysis didapatkan bahwa daya yang mengalir dari generator menuju jaringan sebesar 754 kW. Dari simulasi short circuit analysis didapatkan jika Bus LV1 terjadi gangguan 3-phase fault 1.631 kA, jika sumber kegagalan terjadi pada Bus LV2 -G 1.222 kA. Sedangkan, jika sumber kegagalan terjadi pada Bus MV1 L-L 0.313 kA, jika sumber gangguan terjadi pada Bus MV2 L-L-G 0.260 kA dan jika sumber kegagalan terjadi pada Bus DC sebesar 5.342 kA.

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