Abstract
The purpose of this paper is to introduce, examine, and evaluate the industrial experiences and effectiveness of a Thyristor Controlled Series Compensator (TCSC) replica controller installed in Korea in 2019 through a review of its configuration, test platform, and practical application, and further to propose operational guidelines for replica controllers. Four representative practical cases were conducted: a Dynamic Performance Test (DPT) under a sufficiently large-scale power system prior to the Site Acceptance Test (SAT), pre-verification for on-site controller modification during operation stage, parameter tuning to mitigate the control interaction, and time domain simulation for Sub-Synchronous Torsional Interaction (SSTI). None of these four cases can be performed in a Factory Acceptance Test (FAT) or on-site. Therefore, TCSC control performance was accurately verified under the entire Korean power system based on a large-scale real-time simulator, which demonstrated its effectiveness as a powerful tool for operations including multiple power electronics devices. Our review herein of these four practical cases is expected to show the usefulness of replica controllers, to demonstrate their strength to deal with practical field events, and to contribute to the further expansion of the application area from a perspective of electric utility.
Highlights
With the increasing complexity of power systems and the growth in renewable energy resources, rapidly increasing numbers of power electronic equipment, such as large capacity high-voltage direct current (HVDC) and flexible AC transmission system (FACTS), are being installed to enhance the power system stability and acceptance limit [1,2,3]
Thyristor Controlled Series Compensator (TCSC) topology and the entire network are modeled in a real-time simulator (RTS), and the TCSC control and protection systems are implemented on the replica controller
As the controller Dynamic Performance Test (DPT) is based on large-scale real-time simulator interfaced with a replica controller, it can overcome the barrier of the previous single unit test in Factory Acceptance Test (FAT)
Summary
With the increasing complexity of power systems and the growth in renewable energy resources, rapidly increasing numbers of power electronic equipment, such as large capacity high-voltage direct current (HVDC) and flexible AC transmission system (FACTS), are being installed to enhance the power system stability and acceptance limit [1,2,3]. Its purpose is to determine the optimal locations for load shedding for voltage collapse protection, and to study the behavior of the actual controller and the interaction of FACTS with their future HVDC links. Such large-scale real-time expansion is a world-wide trend for various applications, especially for equipment testing under wide area power systems. Korea installed 34 racks of RTDS in 2017 to test control and protection systems and to study the interaction of HVDC with FACTS and the network of the entire Korean power system [10,11]. We introduce a replica controller planned by KEPCO, describe its purpose of adaptation, present some practical cases, demonstrate its effectiveness from an electric utility perspective, and suggest further operational directions to operate replica controllers in the future
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