Preventive Protection of Autonomous Electric-Power-Systems against Reverse Power Based on Preventive Control

• Published in: Russian electrical engineering 2023-02, Vol.94 (2), p.100-105
• Main Authors: Saushev, A. V., Shirokov, N. V.
• Format: Article
• Language: English
• Subjects: Algorithms; Electric power systems; Emergency procedures; Engineering; Machines; Manufacturing; Processes; Time lag
• ISSN: 1068-3712; 1934-8010
• DOI: 10.3103/S1068371223020104

Issues of ensuring the accident-free transition of an autonomous electric-power system to a partially inoperable state caused by the failure of working generator units are considered. The processes occurring in the network during the transition of one of the sources of electricity to the motor mode are investigated. It is shown that the time delay in the formation of a signal to turn off a failed unit operating with reverse power may not only contribute to the development of a defect in the primary motor, but also lead to an emergency situation associated with loss of controllability. The problem of shutting down a faulty source of electrical power and reducing the load of the network until the moment of overloading the generating units that remained operational is formulated. A diagnostic feature is proposed that allows identifying the inoperable state of the generating unit during its operation. An approach has been developed that implements a method of preventive control of an autonomous electric-power system in the event of failure of its elements. An algorithm is proposed that provides preventive protection of the system against reverse power, which predicts the modes of its operation in the event of an emergency situation. At the same time, structural adaptation is provided, which excludes an emergency situation associated with an interruption in the power supply to the system, and makes it possible to increase its reliability and safety.