Abstract
This study analyzed the impact of varying the momentary cessation (MC) voltage level on the short circuit current of inverter-based resources (IBRs). To analyze the impact of the IBR MC function on the short circuit current, this paper proposes an advanced IBR model for fault current calculation to reflect its fault characteristics and a scheme for analyzing the influence of MC on the short circuit current. Based on the proposed methods, the authors conducted case studies using planning data from the Korea Electric Power Corporation (KEPCO). The influence of MC was investigated on the IBRs located at the southwest side of the KEPCO systems by screening the fault currents while varying the MC voltage. This paper demonstrates that the minimum MC voltage level needed for the fault current not to exceed the circuit breaker (CB) capacity can be proposed through analyzing the impact of MC voltage level on the short circuit current. The test results based on the proposed scheme showed that the short circuit current to power systems could not violate CB capacity if IBRs adjusted the MC voltage level higher than the lowest MC voltage level.
Highlights
The fast expansion of inverter-based resources (IBRs) has created a new variation in power systems
This step is repeated as momentary cessation (MC) voltage level increases by 0.1 pu until the short circuit current is lower than circuit breaker (CB) capacity
The schemes of the influence of the MC voltage on the short circuit current were demonstrated in Korea Electric Power Corporation (KEPCO) systems
Summary
The fast expansion of inverter-based resources (IBRs) has created a new variation in power systems. The characteristics of IBRs (e.g., Wind Turbine Generators and solar Photovoltaics), which differ from those of conventional synchronous generators, have different control, operation, and protection systems and fault current contributions in power systems [1,2,3]. The short circuit current to power systems is reduced as the conventional synchronous generators are replaced by IBRs [4]. The traditional calculation of fault current to power systems is to use the system impedance matrix This traditional method is suitable for short circuit studies on conventional power systems without IBRs. For grids with IBRs, the method should be modified to consider IBR fault current contributions to power systems, since IBR fault responses are different from conventional synchronous generators. The lowest MC voltage of an IBR is suggested to avoid exceeding CB capacity
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