Assignment ProblemsDesign a power system which feeds the combined loads of 1100 MW and 700 MVAR. Your proposed power system may include any number of buses, any number of transmission lines, and any number of generators and loads.However, you need to justify and comment why you have chosen such a configuration of your proposed system.Apply a three-phase symmetrical fault between abus to groundand perform the following:Step
1: Calculations1.Draw the schematic of your proposed power system with appropriate values of parametersand reasonable justification for your design.(15marks)
2.Find the fault current, bus bar voltages, and line currentsusing bus admittance matrix approach. (7.5marks)You can assume the fault impedance as any standard value as you want.
3.Find the fault current, bus bar voltages, and line currents using bus impedance matrix approach.(7.5marks)
4.Compare the results ofpart 3with those from part 2and comment on the results. (5marks)
Step 2: Simulations
You may use PSSE softwareto perform the following tasks. Use the data calculated in Step 1for the power systemand perform the following tasks. See Lab 0and Lab 2-Preliminary in Modules/ Lab Materials in Canvasfor the outlines on how to use PSSEto perform these tasks.
5.Create the system (new case) in PSSE, with input data from Step 1.(snapshot ofschematic diagram in PSSE softwareis needed)(4marks)
6.Run the program to compute fault current and bus voltages during a three-phase fault at the appropriate bus you have chosen in Step 1(8marks)Assume 0.96per-unit prefault voltage. Neglect prefault load currents and all losses.
7.Compute the positive-sequencebus impedance matrix, bus admittance matrix and line currents.(5marks)
8.Compare the results of the fault current and bus voltages with calculations in Step 1. (comment on the results)(4marks)
9.Compare the results of the bus impedance matrix, bus admittance matrix and line currents with the calculations in Step 1. (comment on the results)(4marks)
10.Build the dynamical model of your proposed power system and perform dynamic simulation and three-phase short circuit fault analysis to obtain the bus voltage profile, rotor angle and speed deviation responses of generators(10marks)Step 3: Research and Discussions
11.For your proposed power system, perform some research (include the appropriate references or simulationsif necessary) and discuss the improvementson stability, reliability, security, sustainability, protection, and the cost of your design.(30 marks)