Modeling and Simulation in XENDEE

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1 Modeling and Simulation in 4 Test Feeder Shammya Saha Graduate Research Assistant Electrical Engineering Ira A. Fulton School of Engineering Arizona State University shammya.saha@asu.edu Nathan Johnson Assistant Professor The Polytechnic School Ira A. Fulton School of Engineering Arizona State University nathanjohnson@asu.edu May 4, 2016 This document is one of several guides designed to support skills development in distribution network modeling. It can be used during standard university curricula, a short industry course, self-guided lessons, peer learning, or other training opportunities. Files resulting from the guide can also be modified at the discretion of the user to pursue advanced topics of analysis. The Test Feeders are used as examples given their wide recognition and use. Resulting power flow analysis and short circuit analysis are presented in separate documents for each test feeder. Each guide is developed through a partnership between Arizona State University researchers and. These training guides have been successfully used to train people individually, in small and large classrooms, during interactive micro-grid boot camps, and during short sessions for industry integrators and operators. 4 NODE TEST FEEDER IN BRIEF: 4 Test Feeder tests the capability of a program to represent transformers of various configurations, full three phase lines, and unbalanced loads. It has a transformer and a load with overhead transmission lines.

2 4 NODE TEST FEEDER ONE-LINE DIAGRAM The below figure shows the one-line diagram of the 4 Test Feeder available in the 13 Test Feeder.doc file. 1 The below figure shows the one-line diagrams of the 4 Test Feeder in. Balanced One-Line Unbalanced One-Line Unbalanced One-Line Open Gr.Y/OD MODELING & SIMULATION IN : 4 NODE TEST FEEDER

3 2 1. OVERVIEW AND TECHNOLOGIES This document describes how to model the 4 Test Feeder in the cloud computing platform. simulation models and system infrastructure documentation are also included with this guide. OpenDSS, an open-source technology developed by the Electric Power Research Institute (EPRI), is a powerful analytics engine capable of simulating complex multi-phase electrical power distribution systems. enhances EPRI OpenDSS with enterprise level features such as visualization, design, simulation, and reporting automation. is a web-based analytical tool that runs in Mozilla Firefox (Windows) or Safari (Mac) using the Microsoft Silverlight addon. 2. ATTACHMENT AND RELEVANT DOCUMENTS This package (4TestFeeder.zip) includes model files (.xpf) that can be imported to create a personal project library. Additional supporting files required for independent testing and verification are listed in Table 1. Table 1. List of Files Along with Supporting Files for Modeling. File Name -4B-D-D.xpf -4B-OGrY-OD.xpf -4B-OY-D.xpf -4B-D-GrY.xpf -4B-Y-D.xpf -4B-GrY-GrY.xpf -4UB-DD.xpf -4UB-OGrY-OD.xpf -4UB-OY-D.xpf -4UB-D-GrY.xpf -4UB-GrY-D.xpf -4UB-YY.xpf 4Test Feeder.xlsx File Details Balanced Loading: XML model Delta-Delta Step Down Transformer Balanced Loading: XML model Open Gr Y Open Delta Transformer Balanced Loading: XML model Open Y Delta Step Down Transformer Balanced Loading: XML model Delta-Gr Y Step Down Transformer Balanced Loading: XML model Y-Delta Step Down Transformer Balanced Loading: XML model Gr Y-Gr Y Step Down Transformer Unbalanced: XML model Delta-Delta Step Down Transformer Unbalanced: XML model Open Gr Y-Open Delta Step Down Transformer Unbalanced: XML model Open Y Delta Step Down Transformer Unbalanced : XML model Delta-Gr Y Step Down Transformer Unbalanced : XML model Gr Y-Delta Step Down Transformer Unbalanced : XML model Y-Y Step Down Transformer Power Flow Results and comparison with results MODELING & SIMULATION IN : 4 NODE TEST FEEDER

4 3 The package includes files corresponding to the designs which have step down transformers with balanced loading condition. The other cases that are explained in 4 Test Feeder.doc result section can be designed by modifying the files included in the package. 3. THE NETWORK MODEL automatically generates a one-line diagram and adjusts the layout to accommodate new nodes added to the system. 3.1 POWER UTILITY (SLACK BUS) The utility has been modeled as a kv three phase source (Figure 1). All other parameters for the utility were kept at their default value as shown in. Figure 1. Slack Bus with model (left) and power flow solution (right). 3.2 TRANSMISSION LINE MODELING Modeling power flow along a transmission line requires data including (1) line length between two nodes, (2) line parameters and pole construction data at a specific bus. 4 Test Feeder.doc Line length between two nodes with the configuration for that specific line. Test Feeder.pdf All details summarized for the Test Feeder. MODELING & SIMULATION IN : 4 NODE TEST FEEDER

5 Table 2. Conductor Models in Conductor Model 4 Corresponding code word from Catalogue 336,400 26/7 4 4/0 6/1 ACSR 6 Figure 2. Transmission Line with model (left) and power flow solution (right). 3.3 TRANSFORMER MODELING Transformers are modeled in according to the winding connection provided in the Excel file. 4 Test Feeder.doc Transformer model data. requires ZZ% and XX % ratio RR for modeling a transformer as given in Table 3. Table 3. Transformer Parameters for 13 Test Feeder RR% XX% ZZ% = RR 22 + XX 22 (XX/RR)% XFM MODELING & SIMULATION IN : 4 NODE TEST FEEDER

6 5 Figure 3. Transformer with model (left) and power flow solution (right). 3.4 MODELING LOADS There are only spot load available in the test system: All spot loads have their respective load model (constant power, constant impedance, and constant current) type defined and can be balanced or unbalanced. 4 Test Feeder.doc includes spot load data. Figure 4. Spot loads with model (left) and power flow solution (right). MODELING & SIMULATION IN : 4 NODE TEST FEEDER

7 6 4. MODEL AND SIMULATION VALIDATION This section provides the comparison of results acquired from and results provided in documentation for various transformer configuration. 4.1 VOLTAGE PROFILE VALIDATION: -4B-GRY-GRY.XPF The voltage profile of selected nodes is provided in Table 7 for comparison. Table 7. Comparison of Phase Voltage Magnitude & Angle between Results & Simulation. A-N A-N B-N B-N C-N C-N /-123.5/ /-123.5/ /-128.3/ /-128.3/110.8 The voltage profile at each node can be viewed within the annotation view in. Moreover, the professional report view in can be used to check voltages at any node. 4.2 CURRENT FLOW VALIDATION: -4B-GRY-GRY.XPF The magnitude of current through selected lines is provided in Table 8. Table 8. Comparison of urrent Magnitude between Results & Simulation. Line From To Wire 1_ Wire 3_ The annotation view in can also be used to view current values through individual lines for each phase. 4.3 VOLTAGE PROFILE VALIDATION: -4B-D-D.XPF The voltage profile of selected nodes is provided in Table 9 for comparison. Table 9. Comparison of Phase Voltage Magnitude & Angle between Results & Simulation. A-B A-B B-C B-C C-A C-A /-93.6/ /-93.7/ /-99.4/ /-99.4/140.7 MODELING & SIMULATION IN : 4 NODE TEST FEEDER

8 7 4.4 CURRENT FLOW VALIDATION: -4B-D-D.XPF The magnitude of current through selected lines is provided in Table 10. Table 10. Comparison of urrent Magnitude between Results & Simulation. Line From To Wire 1_ Wire 3_ VOLTAGE PROFILE VALIDATION: -4B-GRY-D.XPF The voltage profile of selected nodes is provided in Table 11 for comparison. Table 11. Comparison of Phase Voltage Magnitude & Angle between Results & Simulation. A-B A-B B-C B-C C-N C-A /-123.6/ /-123.4/ /-129.3/ / / CURRENT FLOW VALIDATION: -4B-GRY-D.XPF The magnitude of current through selected lines is provided in Table 12. Table 12. Comparison of urrent Magnitude between Results & Simulation. Line From To Wire 1_ Wire 3_ VOLTAGE PROFILE VALIDATION: -4B-D-GRY.XPF The voltage profile of selected nodes is provided in Table 13 for comparison. Table 13. Comparison of Phase Voltage Magnitude & Angle between Results & Simulation. A-B A-B B-C B-C C-N C-A /-153.4/ /-153.5/ /-158.3/ / /80.8 MODELING & SIMULATION IN : 4 NODE TEST FEEDER

9 4.8 CURRENT FLOW VALIDATION: -4B-D-GRY.XPF The magnitude of current through selected lines is provided in Table Table 14. Comparison of urrent Magnitude between Results & Simulation. Line From To Wire 1_ Wire 3_ ADDITIONAL NOTES We hope you have benefited from this step-by-step guide to creating an Test Feeder in. The full results report can be generated by importing and simulating the models referenced in this guide. The partnership with has allowed our education and research programs at Arizona State University to grow rapidly through the easy-to-use and versatile user interface. You can find out more about our research, computational lab, micro-grid test bed, and capacity building programs at Visit at to access the online simulation tool Data for the 4 Test Feeder can be downloaded from the Web at To learn OpenDSS visit MODELING & SIMULATION IN : 4 NODE TEST FEEDER