Interaction Boundary Determination of Renewable Energy Sources to Estimate System Strength Using the Power Flow Tracing Strategy

Abstract

System strength is an important concept in the integration of renewable energy sources (RESs). However, evaluating system strength is becoming more ambiguous due to the interaction of RESs. This paper proposes a novel scheme to define the actual interaction boundaries of RESs using the power flow tracing strategy. Based on the proposed method, the interaction boundaries of RESs were identified at the southwest side of Korea Electric Power Corporation (KEPCO) systems. The test results show that the proposed approach always provides the identical interaction boundaries of RESs in KEPCO systems, compared to the Electric Reliability Council of Texas (ERCOT) method. The consistent boundaries could be a guideline for power-system planners to assess more accurate system strength, considering the actual interactions of the RESs.

Grid Connection Studies for Large-Scale Offshore Wind Farms Considering High Penetration of Regional Renewables

“…The assessment of system strength using the WSCR method considering the full interaction of IBRs is a conservative estimation of system strength, leading to overinvestment for reinforcing the system infrastructure. Moreover, the WSCR method may not be applicable to the meshed modern power systems owing to the difficulty in determining the interaction boundaries of IBRs [11]. Therefore, the assessment of the system strength needs to reflect the actual interactions of offshore wind farms and IBRs; this would enable the system planners to recognize the weakness of the system if offshore wind farms are integrated.…”