Abstract
Intermittent power generated from renewable distributed energy resource (DER) can create voltage stability problems in the system during peak power production in the low demand period. Thus, the existing standard for operation and management of the distribution system limits the penetration level of the DER and the amount of load in a power system. In this standard, the hosting capacity of the DER is limited to each feeder at a level where the voltage problem does not occur. South Korea applied this standard, thereby making it hard to achieve its DER target. However, by analyzing the voltage stability of an integrated system, the hosting capacity of DER can be increased. Therefore, in this study, the maximum hosting capacity of DER is determined by analyzing an integrated transmission and distribution system. Moreover, the fast voltage stability index (FVSI) is used to verify the determined hosting capacity of DER. For this, the existing interconnection standard of DER at a feeder, distribution system, and transmission system level is investigated. Subsequently, a Monte Carlo simulation is performed to determine the maximum penetration of the DER at a feeder level, while varying the load according to the standard test system in South Korea. The actual load generation profile is used to simulate system conditions in order to determine the maximum DER hosting capacity.
Highlights
The introduction of distributed energy resource (DER) into the power system comes with many challenges
South Korea’s Standard for DER in the Power System In South Korea, the interconnection of the DER in the distribution system and the operational rules of the distribution system are controlled by Korea Electric Power Corporation (KEPCO)
A feeder of the distribution system is searching for the maximum DER capacity that can be added to a feeder
Summary
The introduction of distributed energy resource (DER) into the power system comes with many challenges. The previous studies focused on increasing DER hosting capacity by modeling the DER as an aggregated value in a bus These studies considered the capacity limit in order to prevent reverse power flow, which is the main cause of a voltage rise problem in the distribution system [12]. They did not consider how the DER can affect each individual feeder in the power system. A distribution system is analyzed to find the maximum penetration of the DER at a feeder level that will not violate the fast voltage stability index (FVSI) limit. The actual load generation profiles of the power system in South Korea are used to simulate one month of operation using the integrated system
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