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TB 554 2013 B4-49 Performance Evaluation and Applications Review of Existing Thyristor Control Series Capacitor Devices – TCSC

This TB is the result of a study performed by WG B4.49 on the use of TCSC systems in AC transmission lines. TCSC systems are used to increase the power transfer capacity of AC lines. AC lines can be readily tapped at a low cost along its corridor and therefore, are often the preferred transmission line technology. Fifteen TCSCs in commercial operation were evaluated. The technical justification for the systems and how well the systems have met the expectations is included in the TB

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TABLE OF CONTENTS

EXECUTIVE SUMMARY ..................................................................................................................... 5

Chapter 1: Introduction ................................................................................................................... 6

Importance of TCSC devices over others ............................................................................ 6

Power flow basics ............................................................................................................ 6

Alternative compensation systems .................................................................................... 9

Chapter 2: General description of TCSC ........................................................................................... 11

TCSC System Performance Characteristics ....................................................................... 11

Installed TCSC base ...................................................................................................... 16

  Chapter 3: installed System Description............................................................................................ 18

 USA ............................................................................................................................ 18

Kayenta 230 kV line ......................................................................................... 18

Slatt – Buckley 500 kV Lie ................................................................................ 18

Brazil .......................................................................................................................... 21

Serra da Mesa TCSC installed in N-S circuit #1 (owned by Furnas) ....................... 21

Imperatriz TCSC installed in N-S circuit #1 (owned by Eletronorte) ....................... 21

Imperatriz and Serra da Mesa TCSCs in circuit #2 (owned by Novatrans)................23

Sweden, Stöde ............................................................................................................ 27

China ......................................................................................................................... 32

Pingguo, China Southern Grid Co., Ltd, Guangzhou, China ................................. 32

Chengxian, Gansu Electric Power Co. Ltd. ........................................................ 36

Fengtun, Northeast China Grid Co., Ltd. .......................................................... 39

India ......................................................................................................................... 43

 Overview of Indian Power System  .................................................................. 43

Thyristor Controlled Series Capacitors ............................................................ 45

Installed TCSC System ................................................................................. 45

TCSC at Raipur on Rourkela- Raipur 400 kV Double-Circuit line ......................... 46

TCSC at Purnea and Gorakhpur substations ................................................... 47

Purnea and Gorakhpur ................................................................................. 50

Chapter 4: Performance Information ................................................................................................ 52

Kayenta .................................................................................................................... 53

Slatt ........................................................................................................................ 53

Brazil ....................................................................................................................... 55

Sweden ................................................................................................................... 56

China ...................................................................................................................... 56

Chapter 5: Security Aspects of FACTS Systems …........................................................................... 57

Design aspects ........................................................................................................ 57

Knowledge about system security limits ..................................................................... 58

Chapter 6:  Useful Life of TCSC Systems .......................................................................................... 59

Equipment life .......................................................................................................... 59

Useful life of the system ........................................................................................... 59

Chapter 7: Conclusions .................................................................................................................. 60

Annex A: Performance analysis of Yi-Feng SSO .............................................................................. 62

Generator set .......................................................................................................... 62

Thyristor controlled series capacitor ........................................................................... 62

Sub-synchronous oscillation (SSO) ............................................................................ 63

The difference between SSR and Yi-Feng SSO ............................................................ 64

Principles of the SSO forming ................................................................................... 65

The multi-mass turbine-generator set and its torsional vibrations ................................... 65

Interaction of electromechanical system and SSO ....................................................... 66

The feasibility of damping SSO using TCSC................................................................. 66

Annex B: TCSC for Damping of Inter-Area Oscillation ....................................................................... 68

The POD structure and its input signal ...................................................................... 69

Realization with Phasor Estimation ........................................................................... 73

Realization with Lead-Lag blocks .............................................................................. 74

 Damping Torque ...................................................................................................... 75

REFERENCES ............................................................................................................................... 76

OTHER REFERENCES......................................................................................................................81