Recent Question/Assignment

RMIT University, School of Engineering
Advanced Power Systems
Experiment 3 - Voltage Control
? Objectives
? Application of DIgSILENT Power Factory software package for detailed system studies, dynamic simulation and voltage control.
? Familiarisation with the concept of voltage control in the power system through the control of reactive power and using shunt compensation such as Static VAR Compensator (SVC).
? Applying dynamic simulations on power systems with Flexible AC Transmission System (FACTS) such as SVCs.
? Equipment and Software
DIgSILENT Power Factory Ver. 2019 which is available on all computers in the computer lab as well as RMIT myDesktop.
? Prerequisites
1. Should complete DIgSILENT Power Factory Learning Tutorial available in Canvas and Experiment 1 and 2
2. Revise Lecture materials and the DIgSILENT PF Dynamic Simulation Functionalities Guide available in Canvas
? DIgSILENT Power Factory Software Package
DIgSILENT Power Factory is the leading high-end power system analysis tool for applications in generation, transmission, distribution and industrial systems. It is integrating all required functions, easy to use, fully Windows compatible and combines reliable and flexible system modelling capabilities with state-of-the-art algorithms and a unique database concept. Besides the stand-alone functionality, the Power Factory engine integrates smoothly into any GIS, DMS or EMS supporting open system standards. The DIgSILENT offers following functionalities.
? Balanced and unbalanced power flow;Fault analysis;
? Harmonics, Frequency scans;
? RMS Stability;
? EMT simulations for three, two and single phase AC systems and DC systems;
? Protection simulation and co-ordination;
? Distribution, transmission and generation reliability;
? Small signal analysis (eigenvalues); Static and dynamic voltage stability;
? Active and reactive power dispatch; State estimation;
? Open tie optimization, optimal capacitor placement, cable sizing;
? Built-in automation interface (DPL),
? ODBC driver, interfaces for GIS and SCADA integration;
? PSS/E compatibility
? Experimental Procedure:
1) Download “Experiment 3.pfd” and save it in your computer. Open the DIgSILENT Power Factory (PF) and then go to: “File Import Data (*.pfd,*.dz,*.dle)”. Then select the
“Experiment 3.pfd” file from the place where you saved it in the computer and then click “Open”. Then activate the project: “File Activate Project” and select the project “Experiment 3” and press “OK”. A schematic of the network model is shown in Figure 1.
Figure 1: A Schematic of the Network Model
2) Run load-flow and record the voltage in all the buses and present your results in a table.
3) Increase the load in Bus 6 (Load B) in 25 MW increments to 150 MW and repeat step 2 for each of these scenarios.
4) Close the switch connecting the SVC (SVS) to Bus 6 and repeat step 3 with the SVC in the system; compare your results with step 3 and explain the effect of the SVC in voltage control.
5) With the SVC in the system, change the reactive power in Load A (Bus 5) from 0 to 100 MVAr in 25 MVAr increments and record the voltages in all buses in a table. Compare the Reactive Power generated by the generators and the SVC in these scenarios.
6) Set Load B to 50 MW and Load A to 50 MVAr without changing the other parameters and record the following results for RMS simulations:
All Generators SVC (SVS) All Buses
Active Power
Reactive Power
Excitation Voltage
Speed
Angle
Turbine Power
Positive Seq. Voltage Magnitude
SVC Voltage Magnitude
SVC Actual Admittance
SVC Total Reactive Power Voltage Magnitude
Voltage Angle
Hints:
? Follow DIgSILENT PF Dynamic Simulation Functionalities Guide for defining the variables and plotting the results.
7) Create a sequence of events as the following table and run a RMS simulation for 20 seconds in this system and plot the results according to step 6:
Event Time (s) Location Description
Fault 5.0 Middle of Line 5-7 (Faults Node) Three phase short circuit
Line Disconnection 5.05 Line 5-7 Breaker 1 Breaker open
Line Disconnection 5.05 Line 5-7 Breaker 2 Breaker open
Load Disconnection 8 Load C (Bus 8) Breaker open
How to submit your Lab-Report?
The experiment should be performed either in a group of two or individually and the Lab report should be prepared accordingly. The lab report is due One Week after the scheduled Lab Session and should be submitted through Canvas. The experiment and report should include the following:
(i) Screen shot of the DIgSILENT Power Factory single-line diagram with the results for the simulated case including graphs and discussion for tasks 1 to 7. (MS Word or PDF)
(ii) Your DIgSILENT Power Factory *.pfd file should also be submitted with the report.

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