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Set the TCR delay angle to 90o and set the reactance to the value computed in section I, question 1. Plot the waveform of the voltage and current across the inductor. Indicate maximum and minimum instantaneous values of voltage and current. Plot the waveform of the current flowing in the thyristors and in ac the line. Plot and record the rms value of the TCR current.
For delay angles of 120o and 150o, repeat Question 1.
Plot the harmonic spectrum of the inductor current up the 20th harmonic, indicating harmonic order and amplitude for all 3 operating conditions (α = 90°, 120°, 150°). (Note: refer to Harmonics analysis using ScopeView for more details on how to plot the harmonic spectrum)
Record and plot the transfer characteristics of the TCR, rms line current and reactive power as a function of delay angle α (α = 90°, 120°, 150°, 180°).
Record and plot the voltage characteristics of the TCR as a function of reactive power and delay angle. Plot for values of α equal to (90°, 120°, 150°, 80°) and voltage equal to (0.2, 0.9, 1.0 pu). Note: Adjust the 345 kV AC source voltage such that the transformer secondary voltage is approximately (0.2, 0.9, 1.0 pu) for each value of α.
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TCR delay angle α | RMS line current (A) for V = 1 pu | Reactive power (Var) for V = 1 pu |
α = 90° |
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α = 120° |
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α = 150° |
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α = 175° |
|
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Table 72: Steady-state operation of the TCR independently Question 4 recorded values
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TCR delay angle α | Reactive power (Var) for V = 0.2 pu |
α = 90° |
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α = 120° |
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α = 150° |
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α = 175° |
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TCR delay angle α | Reactive power (Var) for V = 0.9 pu |
α = 90° |
|
α = 120° |
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α = 150° |
|
α = 175° |
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TCR delay angle α | Reactive power (Var) for V = 1 pu |
α = 90° | refer to Table 2 |
α = 120° | refer to Table 2 |
α = 150° | refer to Table 2 |
α = 175° | refer to Table II |
Table 83: Steady-state operation of the TCR independently Question 5 recorded values
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Disconnect the TCR and connect TSC-1 to the circuit by clicking on the corresponding switches. Tune TSC-1 to act as a 5th harmonic filter with a quality factor equal to 50, using the reactor, capacitor resistance value computed in section I. Plot the reactive power, source phase voltage and capacitor current for both modes of operation of the TSC. Indicate when the thyristors are gated to limit the transient turn-on current.
Record and plot the operating characteristics of the TSC, reactive power as a function of line voltage (0.2, 0.9, 1.0 pu). Note: Adjust the 345 kV AC source voltage such that the transformer secondary voltage is approximately (0.2, 0.9, 1.0 pu) when the TSC operates.
Adjust the AC source voltage back to 345 kV. Reconnect the TCR to the same bus as TSC-1. Plot the harmonic spectrum of the line current up the 20th harmonic, indicating harmonic order and amplitude for α = 120° and 150°.
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TSC mode | Reactive power (Var) for V = 0.2 pu |
Mode 1 |
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Mode 2 |
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TSC mode | Reactive power (Var) for V = 0.9 pu |
Mode 1 |
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Mode 2 |
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TSC mode | Reactive power (Var) for V = 1 pu |
Mode 1 |
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Mode 2 |
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Table 94: Operation of the TSC independently Question 2 recorded values
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Show the operation of the (FC, TSC, and TCR) and plot the operating characteristics of the SVC, reactive power as a function of line voltage (0.2, 0.9, 1.0 pu), over the complete range of reactive powers. Indicate which elements are connected to the system. Only consider the delay angles α equal to 90° and 180° for the TCR. Note: Adjust the 345 kV AC source voltage such that the transformer secondary voltage is approximately (0.2, 0.9, 1.0 pu) when the elements comprising the SVC are operating.
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SVC elements connected | Reactive power (Var) for V = 0.2 pu |
TCR (α = 90°) + FC |
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TCR (α = 180°) + FC |
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TCR (α = 180°) + FC + TSC-1 |
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TCR (α = 180°) + FC + TSC-1 + TSC-2 |
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SVC elements connected | Reactive power (Var) for V = 0.9 pu |
TCR (α = 90°) + FC |
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TCR (α = 180°) + FC |
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TCR (α = 180°) + FC + TSC-1 |
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TCR (α = 180°) + FC + TSC-1 + TSC-2 |
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SVC elements connected | Reactive power (Var) for V = 1 pu |
TCR (α = 90°) + FC |
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TCR (α = 180°) + FC |
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TCR (α = 180°) + FC + TSC-1 |
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TCR (α = 180°) + FC + TSC-1 + TSC-2 |
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Table 105: Operation of the SVC - all components in operation Question 1 recorded values
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