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TB 119 1997 SC 14 WG 14.05 Interaction between HVDC convertors and nearby synchronous machines.

It is not uncommon that HVDC convertor stations and generators are situated electrically and geographically close to each other. This follows from the fact that HVDC links are often built to transmit power from a generating station to a load centre or another part of the power system. Examples of this are the Itaipu and IPP schemes. In these cases the HVDC and generator stations are designed more or less in parallel which means that overall good design can be achieved by appropriate coordination.

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TABLE OF CONTENTS

1 INTRODUCTION

2 REACTIVE COORDINATION BETWEEN SYNCHRONOUS MACHINES AND HVDC CONVERTOR STATIONS

      2.1 Reactive Power Requirement of HVDC Convertors

      2.2 Operating Characteristics of Synchronous Machines

      2.3 Reactive Power Compensation

3 HARMONIC INTERACTIONS

4 INTERACTIONS BETWEEN TURBINE AND HVDC CONTROLS

      4.1 General

      4.2 Overspeed Protection

5 TORSIONAL INTERACTIONS

      5.1 Description of Phenomenon

      5.2 Factors Affecting Torsional Stresses

      5.3 Solutions to Prevent Torsional Stresses

6 ELECTRICAL RESONANCES

      6.1 Resonances in the Positive-Sequence System

      6.2 Resonances in the Zero-Sequences System

7 VARIATIONS IN ACTIVE POWER

      7.1 Transient Stability and Rotor Oscillations

      7.2 Frequency Excursions

      7.3 Transient Power Reversal in HVDC Transmission

8 OVERVOLTAGES

      8.1 Temporary Overvoltages

      8.2 Switching Overvoltages

      8.3 Lightning Overvoltages

9 SELF-EXCITATION

      9.1 Description of Phenomenon

      9.2 Protective Measures

      9.3 Exciter Stresses on Generators Connected into Collector Systems

10 CONCLUSIONS

11 REFERENCES