HVDC

2. VOLTAGE AND POWER STABILITY OF HVDC
SYSTEM
BY
PRABIN KAFLE
17WJ1AO293
GURU NANAK INSTITUTIONS TECHNICAL CAMPUS
IBRAHIMPATNAM,RR DIST-501506

3. -HVDC-
HIGH VOLTAGE DIRECT CURRENT

4. CONTENTS
 INTRODUCTION
 TYPES OF HVDC SYSTEM
 HISTORY
 HOW DOES IT WORKS?
 ADVANTAGES/DISADVANTAGES
 CONCLUSION

5. INTRODUCTION
HVDC STANDS FOR HIGH VOLTAGE DIRECT
CURRENT AND IS TODAY A WELL-PROVEN
TECHNOLOGY EMPLOYED FOR POWER
TRANSMISSION ALL OVER THE WORLD.
HVDC TECHNOLOGY IS USED TO TRANSMIT
ELECTRICITY OVER LONG DISTANCE BY
COVER HEAD TRANSMISSION LINES OR
SUBMARINE CABLES.

6. HISTORY
• THE DEVELOPMENT OF DIRECT CURRENT (DC)
TRANSMISSION DATES BACK TO THE 1930’S AND
HAS BEEN A PROVEN TECHNOLOGY SINCE THE
FIRST MAJOR INSTALLATIONS IN
1954. OPERATING AT ±500 KILOVOLTS, THE LINE
IS CAPABLE OF TRANSMITTING UP TO 3,100 MW
OF POWER. IN TERMS OF OPERATING VOLTAGE
AND CAPACITY, THE PACIFIC INTERTIE IS
SIMILAR TO THE CLEAN LINE TRANSMISSION
LINE PROJECTS, WHICH WILL OPERATE AT ±600
KILOVOLTS AND DELIVER UP TO 3,500 MW OF
POWER.

7. TYPES OF HVDC SYSTEM
HVDC
SYSTEM
Single-infeed system Multi-infeed system
Ring-type multi-
infeed system
Chain-type multi-
infeed system

8. STABILITY OF HVDC SYSTEM
A. STEADY STATE STABILITY
I. STATIC STABILITY
II. DYNAMIC STABILITY
B. TRANSIENT STABILITY

9. VOLTAGE STABILITY
• FOR THE SINGAL-INFEED HVDC SYSTEM MODEL, THE VOLTAGE
STABILITY FACTOR(VSF) IS DEFINE AS
VSF=
∆𝑈
∆𝑄
WHERE,
VSF= VOLTAGE SENSITIVITY OF AC/DC INTERCONNECTION
∆U= THE INCREMENTAL CHANGE IN THE CONVERTER AC BUS VOLTAGE
∆Q= THE INCREMENTAL CHANGE IN THE INJECTED REACTIVE POWER

10. WORLDWIDE INSTALLED CAPACITY OF HVDC LINKS

11. POWER STABILITY

12. HOW IT WORKS

13. HVDC IN INDIA

14. ADVANTAGES OF STABILITY OF HVDC
SYSTEM
FULL CONTROL OVER POWER TRANSMISSION.
PERFORM EFFICIENT AND STABLE OPERATION.
MAXIMUM FLEXIBILITY OF POWER CONTROL WITHOUT
COMPROMISING THE SAFETY OF EQUIVALENT.
HIGHER VOLTAGE LEVEL AND POWER RATING.
LOWER POWER LOSSES.
LOWER COST OF CONVERTER.

15. DISADVANTAGES OF STABILITY OF
HVDC SYSTEM
LOWER VOLTAGE LEVEL AND POWER
RATING.
HIGH LOSS
HIGHER COST OF CONVERTER
CURRENT DIRECTION CANNOT BE
CHANGED
REACTIVE POWER CONSUMPTION
RISK OF COMMUTATION FAILURES

16. CONCLUSION
• THIS PRESENTATION PROVIDED AN OVERVIEW OF
VOLTAGE/POWER STABILITY ANALYSIS METHODOLOGIES
APPROPRIATE FOR NEWLY EMERGING HVDC SYSTEM
CONFIGURATIONS.
• IT WAS SHOWN HOW THE METHODS SUITED FOR THE SINGLE-
INFEED SYSTEM MODEL COULD BE EXTENDED TO THE HIGHER
DIMENSION HVDC SYSTEM MODELS.