8EE1 EHV AC/DC TRANSMISSION

Unit-1

EHV AC Transmission:

Need of EHV transmission lines, power handling capacity and surge

impedance loading. Problems of EHV transmission, bundled conductors: geometric mean

radius of bundle, properties of bundle conductors. Electrostatic fields of EHV lines and their

effects, corona effects: Corona loss, audio and radio noise.

Unit-2

Load Frequency Control:

Introduction to control of active and reactive power flow, turbine

speed governing system. Speed governing characteristic of generating unit and load sharing

between parallel operating generators.

Method of Load Frequency Control:

Flat frequency,

flat tie line and tie line load bias control. Automatic generation control (description of block

diagram only).

Unit-3

Voltage Control:

No load receiving end voltage and reactive power generation. Methods of

voltage control. Synchronous phase modifier, shunt capacitors and reactors, saturable reactors,

Thynstorised static VAR compensators- TCR, FC-TCR and TSC- TCR.

Unit-4

FACTS:

Introduction to FACTS controllers, types of FACTS controllers, Brief description of

STATCOM, Thyristor controlled series capacitors and unified power flow controller.

Unit-5

HVDC Transmission:

Types of D.C. links, advantages and disadvantages of HVDC

transmission. Basic scheme and equipment of converter station. Ground return. Basic