(a) Two three-phase, 400kV (rms), 50Hz, AC networks are connected together via a current-source HVDC link...
(a) Two three-phase, 400kV (rms), 50Hz, AC networks are connected together via a current-source HVDC link made up of a three-phase, 12-pulse full-wave thyristor rectifier and a three-phase, 12-pulse full-wave thyristor inverter.
(i) Draw the circuit diagram for this system and explain, for the rectifier stage, how the firing delay angle may be used to control the average DC voltage.
(ii) Explain the main advantages of HVDC transmission compared to AC transmission.
(b) An H-Bridge converter is to be used to connect a 500V DC supply to the 50Hz, 230Vrms AC grid. The converter operates with a switching frequency of 2kHz and is connected to the grid through a 2mH inductor.
(i) Draw the circuit diagram for the H-Bridge circuit and explain how the switches are controlled to regulate the output voltage generated by the converter.
(ii) Given that the H-Bridge inverter is modulated using sinusoidal PWM, calculate the modulation index and phase (with reference to the grid voltage) of the inverter modulation signal required to deliver 10kW / 0VAr average power to the AC grid
Homework Answers
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(a) Two three-phase, 400kV (rms), 50Hz, AC networks are
connected together via a current-source HVDC link...
A single-phase full bridge thyristor rectifier is supplied from a 200vrm 50HZ AC source, and supplies...
A single-phase full bridge thyristor rectifier is supplied from a 200vrm 50HZ AC source, and supplies a series R-L load comprising a 202 resistance and a 36.8mH inductance 2.a. Sketch the circuit diagram for this rectifier Q2. [4 marks] [Refer to lecture notes] 2.b. Determine the maximum possible average DC voltage that can be achieved across the load resistor [4 marks] [VDC (avg) = 180V] 2.c. Determine the SCR firing angle at which the rectified output curent will just be...
Figure 6.6 Three-phase bridge inverter. Di D Os Ds 81 AD (a) Circuit 81 82 112m3...
Figure 6.6 Three-phase bridge inverter. Di D Os Ds 81 AD (a) Circuit 81 82 112m3 21 (b) Waveforms for 180 Turbine blades VSI Wind generatorRectifier Voltage source inverter Ac grid (c) Wind generator connected to the ac grid through a rectifier and an inverter
An AC-AC converter with a thyristor connected to a 250 V (phase-neutral) and 50 Hz source...
An AC-AC converter with a thyristor connected to a 250 V (phase-neutral) and 50 Hz source is Y-connected. It feeds a 3-phase resistor. Circuit losses are neglected. Load resistance is 10 Ω / phase, α trigger angle is ?/6rad. Accordingly a) Calculate the effective values of the output voltage, output current and output power of the converter. b) Find the total reactive and total harmonic powers for the α angle value you obtained. c) Calculate the phase shift angle, phase...
Consider a three-phase thyristor-based AC-DC converter supplying a “superconductive inductance” of 10 H and 200 A....
Consider a three-phase thyristor-based AC-DC converter supplying a “superconductive inductance” of 10 H and 200 A. The grid voltage is 400VLL/60Hz. A) What is the shortest time to fully charge the Inductor, from “zero energy condition?” What value of firing angle of the thyristors (α) should be used in this case? B) When the inductor is fully charged, what value of α should be used to keep it at “stand-by”? How much reactive power does the AC-DC converter absorb from...
please solve this problem with detail explainations. Thanks Problem # 1 If the available power source is a three-phase, 60 Hz, ac supply and a separately excited DC motor is to be fed from this sourc...
please solve this problem with detail explainations. Thanks
Problem # 1 If the available power source is a three-phase, 60 Hz, ac supply and a separately excited DC motor is to be fed from this source, configure possible drive circuits for iOne-Quadrant Operation, i) Two-Quadrant Operation ) Four- Quadrant Operation Hints: (See below for the single phase diagram) For one-quadrant operation, the motor control circuit is a half-wave controlled rectifier or a se controlled converter and the driver for the...
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct seque...
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct sequence, having rms line-to-line voltage of Vuns equal to 415 V and angular frequency ω equal to 100π rad/s. The load is sufficiently inductive to smooth out the load current i(t), i.e. i 1, where I is a constant. a. Derive the mathematical expression of the average DC...
below is the hint from my professor for the solution hopefully it can help you guy for the solving problem Problem # 1 If the available power source is a three-phase, 60 Hz, ac supply and a separat...
below is the hint from my professor for the solution
hopefully it can help you guy for the solving problem
Problem # 1 If the available power source is a three-phase, 60 Hz, ac supply and a separately excited DC motor is to be fed from this source, configure possible drive circuits for iOne-Quadrant Operation, i) Two-Quadrant Operation ) Four- Quadrant Operation Hints: (See below for the single phase diagram) For one-quadrant operation, the motor control circuit is a half-wave...
In this part of the term paper, design a single-phase switch-mode DC power supply with a forward ...
In this part of the term paper, design a single-phase switch-mode DC power supply with a forward converter. Provide answers to the questions below Please combine the single-phase full-wave rectifier from part two of your term paper with a forward converter to produce a switch-mode DC power supply, as shown below. The output of the bridge rectifier serves as input to the forward converter L1 Np: N BH621BH62 D, V1 Load C1 100p 45 Vrms D3 BH62 18H62 D4 Control...
3. A controlled single-phase fiull-wave controlled rectifier is connected in a de motor drive in Figure...
3. A controlled single-phase fiull-wave controlled rectifier is connected in a de motor drive in Figure 4. The de motor armature inductance can be assumed large enough such that any motor curent ripple is negligible. (a) Assuming negligible supply reactance, show that the average rectifier output voltage V, in tems of the supply ms voltage E and the firing angle a, is given by 2/2E (6 marks) cos a _ (b) Given that the supply voltage is 230V, 50HZ and...
1. A single-phase, full wave rectifier has an AC source with Vm=24 volts at f=60 Hz. Determine the 2th harmonic of the output voltage. 2. The average current of a single phase bridge rectifier at its...
1. A single-phase, full wave rectifier has an AC source with Vm=24 volts at f=60 Hz. Determine the 2th harmonic of the output voltage. 2. The average current of a single phase bridge rectifier at its DC side is 6.94 amps. What is the average current flowing through each diode?
A single-phase full bridge thyristor rectifier is supplied from a 200vrm 50HZ AC source, and supplies a series R-L load comprising a 202 resistance and a 36.8mH inductance 2.a. Sketch the circuit diagram for this rectifier Q2. [4 marks] [Refer to lecture notes] 2.b. Determine the maximum possible average DC voltage that can be achieved across the load resistor [4 marks] [VDC (avg) = 180V] 2.c. Determine the SCR firing angle at which the rectified output curent will just be...
Figure 6.6 Three-phase bridge inverter. Di D Os Ds 81 AD (a) Circuit 81 82 112m3 21 (b) Waveforms for 180 Turbine blades VSI Wind generatorRectifier Voltage source inverter Ac grid (c) Wind generator connected to the ac grid through a rectifier and an inverter
please solve this problem with detail explainations. Thanks
Problem # 1 If the available power source is a three-phase, 60 Hz, ac supply and a separately excited DC motor is to be fed from this source, configure possible drive circuits for iOne-Quadrant Operation, i) Two-Quadrant Operation ) Four- Quadrant Operation Hints: (See below for the single phase diagram) For one-quadrant operation, the motor control circuit is a half-wave controlled rectifier or a se controlled converter and the driver for the...
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct sequence, having rms line-to-line voltage of Vuns equal to 415 V and angular frequency ω equal to 100π rad/s. The load is sufficiently inductive to smooth out the load current i(t), i.e. i 1, where I is a constant. a. Derive the mathematical expression of the average DC...
below is the hint from my professor for the solution
hopefully it can help you guy for the solving problem
Problem # 1 If the available power source is a three-phase, 60 Hz, ac supply and a separately excited DC motor is to be fed from this source, configure possible drive circuits for iOne-Quadrant Operation, i) Two-Quadrant Operation ) Four- Quadrant Operation Hints: (See below for the single phase diagram) For one-quadrant operation, the motor control circuit is a half-wave...
In this part of the term paper, design a single-phase switch-mode DC power supply with a forward converter. Provide answers to the questions below Please combine the single-phase full-wave rectifier from part two of your term paper with a forward converter to produce a switch-mode DC power supply, as shown below. The output of the bridge rectifier serves as input to the forward converter L1 Np: N BH621BH62 D, V1 Load C1 100p 45 Vrms D3 BH62 18H62 D4 Control...
3. A controlled single-phase fiull-wave controlled rectifier is connected in a de motor drive in Figure 4. The de motor armature inductance can be assumed large enough such that any motor curent ripple is negligible. (a) Assuming negligible supply reactance, show that the average rectifier output voltage V, in tems of the supply ms voltage E and the firing angle a, is given by 2/2E (6 marks) cos a _ (b) Given that the supply voltage is 230V, 50HZ and...
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