GATE EE 2015 Set 1 | High Voltage Dc Transmission Question 1 | Power System Analysis

Consider a $$HVDC$$ link which uses thyristor based line commutated converters as shown in the figure. For a power flow of $$750$$ $$MW$$ from System $$1$$ to System $$2,$$ the voltages at the two ends, and the current, are given by: $${V_1} = 500\,kV,\,\,{V_2} = 485\,kV\,\,$$ and $$\,{\rm I} = 1.5\,kA.\,\,$$ If the direction of power flow is to be reversed (that is, from System $$2$$ to System $$1$$) without changing the electrical connections, then which one of the following combinations is feasible? GATE EE 2015 Set 1 Power System Analysis - High Voltage Dc Transmission Question 1 English

GATE EE 2015 Set 1 Power System Analysis - High Voltage Dc Transmission Question 1 English

$${V_1} = - 500\,kV,\,\,\,{V_2} = - 485\,kV$$ and $$\,\,\,{\rm I} = 1.5\,kA$$

$${V_1} = - 485\,kV,\,\,\,{V_2} = - 500\,kV$$ and $$\,\,\,{\rm I} = 1.5\,kA$$

$${V_1} = 500\,kV,\,\,\,{V_2} = 485\,kV$$ and $$\,\,\,{\rm I} = -1.5\,kA$$

$${V_1} = - 500\,kV,\,\,\,{V_2} = - 485\,kV$$ and $$\,\,\,{\rm I} = -1.5\,kA$$

GATE EE 2010

MCQ (Single Correct Answer)

-0.3

Power is transferred from system $$A$$ to system $$B$$ by an $$HVDC$$ link as shown in the figure. If the voltage $${V_{AB}}$$ and $${V_{CD}}$$ are as indicated in the figure, and 1 > 0, then GATE EE 2010 Power System Analysis - High Voltage Dc Transmission Question 2 English

GATE EE 2010 Power System Analysis - High Voltage Dc Transmission Question 2 English

$${V_{AB}}\, < \,0,\,\,{V_{CD}}\, < 0,\,\,{V_{AB}}\, > \,{V_{CD}}$$

$${V_{AB}}\, > \,0,\,\,{V_{CD}}\, > 0,\,\,{V_{AB}}\, < \,{V_{CD}}$$

$${V_{AB}}\, > \,0,\,\,{V_{CD}}\, > 0,\,\,{V_{AB}}\, > \,{V_{CD}}$$

$${V_{AB}}\, > \,0,\,\,{V_{CD}}\, < 0,\,\,{V_{AB}}\, > \,{V_{CD}}$$

GATE EE 2007

MCQ (Single Correct Answer)

-0.3

Two regional system, each having several synchronous generators and loads are interconnected by an ac line and a HVDC link as shown in the figure. Which of the following statements is true in the steady state: GATE EE 2007 Power System Analysis - High Voltage Dc Transmission Question 3 English

GATE EE 2007 Power System Analysis - High Voltage Dc Transmission Question 3 English

Both regions need not have the same frequency

The total power flow between the regions (P_ac + P_dc) can be changed by controlling the HVDC converters alone

The power sharing between the ac line and the HVDC link can be changed by controlling the HVDC converters alone.

The directions of power flow in the HVDC link (Pdc) cannot be reversed.

GATE EE 2006

MCQ (Single Correct Answer)

-0.3

An HVDC link consists of rectifier, inverter transmission line and other equipments. Which one of the following is true for this link?

The transmission line produce/supplies reactive power

The rectifier consumes reactive power and the inverter supplies reactive power from/to the respective connected consumes

Rextifier supplies reactive power and the inverted consumes reactive power to/from the respective connected AC systems

Both the converters (rectifier and inverter) consume reactive power from the respective connected AC systems.

GATE EE Subjects

Electromagnetic Fields

Time Varying Fields Electrostatics Magnetostatics

Signals and Systems

Continuous and Discrete Time Signals Linear Time Invariant Systems Continuous Time Signal Fourier Transform Discrete Time Signal Z Transformation Continuous Time Signal Laplace Transform Sampling Theorem Continuous Time Periodic Signal Fourier Series Miscellaneous

Engineering Mathematics

Calculus Vector Calculus Linear Algebra Differential Equations Probability and Statistics Transform Theory Complex Variable Numerical Methods

General Aptitude

Verbal Ability Logical Reasoning Numerical Ability

Power Electronics

Choppers and Commutation Techniques Single and Three Phase Rectifier Power Semiconductor Devices Ac Voltage Controllers Inverters

Power System Analysis

Per Unit System Power Generation Cost Power System Stability Symmetrical Components and Symmetrical and Unsymmetrical Faults Circuit Breaker Switch Gear and Protection Load Flow Studies High Voltage Dc Transmission Generating Power Station Parameters and Performance of Transmission Lines

Analog Electronics

Diode Circuits and Applications Frequency Response Bjt and Mosfet Biasing 555 Timer Feedback Amplifiers and Oscillator Circuits Operational Amplifier Small Signal Modeling

Control Systems

Block Diagram and Signal Flow Graph Polar Nyquist and Bode Plot State Variable Analysis Basics of Control System Routh Hurwitz Stability Time Response Analysis Root Locus Techniques Controller and Compensator

Digital Electronics

Boolean Algebra Logic Gates Combinational Circuits Minimization Logic Families and Memories Sequential Circuits Analog to Digital and Digital to Analog Converter Microprocessor

Electrical Machines

Induction Machines D.C Machines Synchronous Machines Transformers

Electric Circuits

Network Elements Network Theorems Three Phase Circuits Transient Response Sinusoidal Steady State Analysis Graph Theory Two Port Networks

Electrical and Electronics Measurement

Basic of Indicating Instruments Error Analysis and Measurement Measurement of Resistance and A.C Bridges Measurement of Energy and Power Digital Voltmeters Questions Potentiometer and Instrument Transformers Cathode Ray Oscilloscope