Abstract
As Korea aims to increase the extent to which renewable energy sources (RES) account for up to 20% of the total power generated in the country by 2030, the feasibility of this target is a major concern. This concern largely results from the Korean power system possessing unique characteristics, such as its electrical isolation and high density. To achieve the RES target, the reliable operation of the power system must coexist with an increased share of RES power generation. This study proposes a method to evaluate the penetration limit of RES in the Korean power system considering the existing plans for the long-term electricity supply and demand, as well as its operational requirements. The Korea electric power corporation (KEPCO) planning database of the Korean power system for the next 15 years was employed to determine the penetration limit of RES considering the reliability criteria, including the minimum power generation of conventional sources, primary frequency control requirement, 10-min reserve requirement, and frequency stability.
Highlights
Korean power systems operate to supply an ever-increasing demand for electricity considering the economic priority of the country to generate resources
Penetration Limit Determined by the Primary Frequency Control Requirement
The penetration level of renewable energy sources (RES) must be limited to the extent to which the integrated RES power system can compensate for the experienced variability in terms of the primary frequency control
Summary
Korean power systems operate to supply an ever-increasing demand for electricity considering the economic priority of the country to generate resources. Nuclear and coal power plants have supplied about 71% of the required demand in Korea as of 2017 [1]. The Korean government has recently announced that it will increase the proportion of renewable energy sources (RES) to 20% by 2030 through the Basic Plan for Long-term Electricity Supply and Demand (BPE) [5]. The additional resources are required as ancillary power sources to considerably increase the share of RES in power systems [7,8,9,10]. The availability of these additional resources is often limited, which in turn limits the extent to which RES can be accepted by power systems that meet the performance criteria
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