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by: Shammya Saha

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# EEE 598 Assignment 3 EEE 598

Shammya Saha
ASU
GPA 3.83

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This is the solution for EEE 598 Assignment 3
COURSE
Power System Control and Monitoring
PROF.
Dr. Undrill
TYPE
Class Notes
PAGES
10
WORDS
KARMA
25 ?

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This 10 page Class Notes was uploaded by Shammya Saha on Saturday March 5, 2016. The Class Notes belongs to EEE 598 at Arizona State University taught by Dr. Undrill in Fall 2015. Since its upload, it has received 19 views. For similar materials see Power System Control and Monitoring in Electrical Engineering at Arizona State University.

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Date Created: 03/05/16
Power plant Control and Monitoring Assignment-3 Shammya Shananda Saha ID: 120 950 8778 1 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha Case – 1: For case 1, the first generator which is connected to Bus 1 is changed to (0-j20) MVA. As this is a PV bus, the real power is set to zero and the voltage scheduled is changed to 0.992 so that the reactive power is set to –j20 MVA. To disconnect the generator from the system, the transformer status is changed to an inactive state. This gives an idea how the voltage regulators behave when the generator is open circuited. Figure 1: (a) Generator Terminal Voltage (b) Generator Real Power (c) Generator Rotor Angle 2 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha Figure 2: (a) Exciter Output Voltage (b) Exciter Current So, it has been found that the in the event of opening the generator, the generator voltage goes down and the exciter almost instantaneously reacts and sets the generator voltage to the scheduled value. As the real power output from generator 1 is no more present, generator 2 encounters an oscillation in its power flow but the exciter of the second generator restores its power to a stable value. 3 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha Case-2: The case 2 has been simulated bysetting the generator output to be 175MW and then changing the voltage reference of generator 1 to 1.02 from 1.00. Figure 3: (a) Generator Terminal Voltage (b) Exciter Output Voltage (c) Exciter Current 4 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha From the plots it is found that changing the voltage reference at 5 seconds, sets the steady state value of the generator 1 terminal voltage to be 1.02. As there is no change in the load or any outer conditions, increasing of voltage for generator 1 forces the exciter of the second generator 2 react and set the second generator output voltage to a stable value. From the overall plot, it can be concluded that system is in stable after the change in voltage reference. Case-3 and Case 4: The case 3 and case 4 is differentiated by a power system stabilizer while the generator is producing 125 MW and 175 MW respectively and one of the lines is opened at 5 seconds. Generators are Producing 125 MW Respectively Figure 3: (a) Generator Terminal Voltage without PSS (b) Generator Terminal Voltage with PSS Exciter Current Figure 4: (a) Generator Rotor Angle without PSS (b) Generator Rotor Angle with PSS 5 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha Figure 5: (a) Generator Real Power Output without PSS (b) Generator Real Power Output with PSS Figure 6: (a) Exciter output Voltage without PSS (b) Exciter output Voltage with PSS 6 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha Figure 7: (a) Exciter Current without PSS (b) Exciter current with PSS It is evident that the system in the event of a wrong switching which caused the opening of a transmission line, the system without PSS is stable after encountering an oscillation in the real power output of the generator. But having a PSS in the system stabilizes the rotor angle and the generator output faster. The real power output reaches at a steady state value at 11 seconds when there is a PSS in the system while the real power output has a low damping when the system is without PSS. So for the case of 125 MW power output from the generators the system without PSS shows stable behaviour but having the PSS makes the system stable faster by providing additional damping. 7 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha Generators are Producting 175 MW Respectively Figure 8: (a) Generator Terminal Voltage without PSS (b) Generator Terminal Voltage with PSS Exciter Current Figure 9: (a) Generator Rotor Angle without PSS (b) Generator Rotor Angle with PSS 8 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha Figure 10: (a) Generator Real Power Output without PSS (b) Generator Real Power Output with PSS Figure 11: (a) Exciter output Voltage without PSS (b) Exciter output Voltage with PSS 9 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha Figure 12: (a) Exciter Current without PSS (b) Exciter current with PSS From the plots it is found that when the genrators are producing 175 MW and one of the transmission lines are opened by a switching error the real power output is encountering an oscillation. The rotor angle plots show that there is a high frequency oscillation when the generators do not have a PSS to provide additional damping. But the right side plots where the generaotors are equipped with power system stabilizers the oscillation decays as the system has now have additional damping support which dampens the oscillation. Moreover, the exciter voltage settles quickly in the case when the system is equipped with a PSS. The exciter current also shows an oscilatory behaviour which is not present in the exciter current as PSS provides additional damping. 10 Assignment – 3: Power Plant Control and Monitoring – Shammya Saha

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