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System protection is laid between the defenses for power system protective relaying and the emergency control. Under the premise of ensuring the safety of electrical equipment, it strives to ensure the safety of the system, block the chain of occurrence and growth of cascading faults, and effectively avoid the occurrence of large-scale blackout catastrophes. This book systematically elaborates on the dealing technology of a special type of fault, the “cascading fault”, in the AC-DC hybrid large-scale power grid. The main contents include immunization distance protection for accident overload distance protection that is immune to oscillation inverter control technology to prevent long-term or continuous commutation failure DC participation emergency power flow control technology used to share the accident transfer overload caused by inverter lockout and overhead transmission line adaptive overload protection.
This book analyzes the action behavior of traditional relay protection during chain failures in AC-DC hybrid grids from the perspective of relay protection for the purpose of protecting the safety of large grids. The book’s findings clearly point out that the accidental overload after fault removal and the incorrect action of relay protection during oscillation are the main problems of traditional relay protection. With the emergence of hybrid AC-DC grids, the failure of DC system phase changes due to voltage reduction during AC system failure becomes almost certain, and the long-term phase change failure will inevitably cause DC lockout, which will trigger more serious chain reactions.
In response to these problems, this book presents the principles and techniques of distance protection immune to overload and distance protection immune to oscillation, control techniques to prevent long-term phase change failures of converters and techniques for emergency tidal control of DC system participation to avoid large power surpluses in the AC grid, to which the DC system is connected. These techniques have an important role in ensuring that the power balance of the AC grid is maintained during faults and fault handling and in maintaining the integrity of the grid topology, as well as allotting valuable time for the subsequent functioning of a safe and stable control system.
This book is innovative the concepts of non-tripping relay protection and phase change failure prevention and control are concrete and the understanding of interlocking faults and interlocking faults leading to large outages is comprehensive and objective. The theoretical and technical measures described in the book are complete, self-contained and have an important role in improving the safety prevention and control system of the power grid.
Overview
Distance Protection Against Overload
Immunityin Distance Protection of Oscillations
Commutation Failure Prevention and Control
DC Participation in Emergency Tidal Control
Adaptive Overload Protection for Overhead Transmission Lines