JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Power Electronics, Power System Operation and Control, HVDC Transmission

Course Objectives:

• Definition of power quality and different terms of power quality.
• Study of voltage power quality issue – short and long interruption.
• Detail study of characterization of voltage sag magnitude and three phase unbalanced voltage sag.
• Know the behaviour of power electronics loads; induction motors, synchronous motor etc by the power quality issues.
• Overview of mitigation of power quality issues by the VSI converters.
• To understand the fundamentals of FACTS Controllers,
• To know the importance of controllable parameters and types of FACTS controllers & their benefits
• To understand the objectives of Shunt and Series compensation
• To Control STATCOM and SVC and their comparison and the regulation of STATCOM, Functioning and control of GCSC, TSSC and TCSC

Course Outcomes

After completion of this course, the student will be able to:

• Know the severity of power quality problems in distribution system
• Understand the concept of voltage sag transformation from up-stream (higher voltages) to down-stream (lower voltage)
• Concept of improving the power quality to sensitive load by various mitigating custom power devices
• Choose proper controller for the specific application based on system requirements
• Understand various systems thoroughly and their requirements
• Understand the control circuits of Shunt Controllers SVC & STATCOM for various functions viz. Transient stability Enhancement, voltage instability prevention and power oscillation damping
• Understand the Power and control circuits of Series Controllers GCSC, TSSC and TCSC

UNIT - I

Power Quality Problems in Distribution Systems: Power Quality problems in distribution systems: Transient and Steady state variations in voltage and frequency. Unbalance, Sags, Swells, Interruptions, Wave-form Distortions: harmonics, noise, notching, dc-offsets, fluctuations. Flicker and its measurement.

UNIT - II

Transmission Lines and Series/Shunt Reactive Power Compensation: Basics of AC Transmission. Analysis of uncompensated AC transmission lines. Passive Reactive Power Compensation. Shunt and series compensation at the mid-point of an AC line. Comparison of Series and Shunt Compensation.

UNIT - III

Static Shunt Compensators: Objectives of shunt compensation, Methods of controllable VAR generation, Static Var Compensator, its characteristics, TCR, TSC, FC-TCR configurations, STATCOM, basic operating principle, control approaches and characteristics

UNIT - IV

Static Series Compensators: Objectives of series compensator, variable impedance type of series compensators, TCSC, TSSC-operating principles and control schemes, SSSC, Power Angle

characteristics, Control range and VAR rating, Capability to provide reactive power compensation, external control

UNIT - V

Combined Compensators: Introduction to Unified Power Flow Controller, Basic operating principles, Conventional control capabilities, Independent control of real and reactive power.

TEXT BOOKS:

• 1. Electrical Power Systems Quality, Dugan Roger C, Santoso Surya, Mc Granaghan, Marks F. Beaty and H. Wayre, Mc Graw Hill
• 2. Power Systems Quality Assessment, J. Arillaga, N.R. Watson, S.Clon, John Wiley.

REFERENCE BOOKS:

• 1. Power Quality, C.Sankaran, CRC Press 4. Understanding power quality problems, Math H. Bollen, IEEE press.
• 2. “Understanding FACTS –Concepts and Technology of Flexible AC Transmission Systems” Narain G.Honorani, Laszlo Gyugyi