Evaluation Method for Hosting Capacity of PV System in Distribution System with Micro Hydropower Generator
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ORIGINAL ARTICLE
Evaluation Method for Hosting Capacity of PV System in Distribution System with Micro Hydropower Generator Hu‑Dong Lee1 · Dong‑Hyun Tae1 · Ji‑Myung Kim1 · Dae‑Seok Rho1 Received: 20 April 2020 / Revised: 29 June 2020 / Accepted: 19 August 2020 © The Korean Institute of Electrical Engineers 2020
Abstract According to the Korean government’s policy to demonstrate and expand renewable energy sources, distributed generators such as photovoltaic (PV) and wind power (WP) systems are energetically installed and operated in distribution systems. However, there are many issues related to power quality problems including an over-voltage phenomenon when the PV systems were interconnected and operated. In order to overcome these problems the electric power company has installed the step voltage regulator (SVR) in primary feeders interconnected with PV systems, and also has established technical guidelines for distributed generators to stabilize the customer voltages. However, despite such voltage regulators and technical guidelines, it is difficult to maintain the customer voltages within the allowable voltage limit. In order to actively host a large-capacity PV system, this paper proposes an optimal voltage control algorithm of micro hydropower generator (MHG) to keep customer voltages within the allowable voltage limit and presents an evaluation algorithm for hosting capacity of PV system based on a sensitivity analysis method. Furthermore, this paper performs PSCAD/EMTDC modeling based on the proposed algorithm and analyzes characteristics of customer voltages based on various scenarios related to the location and capacity of the PV system and MHG. From the simulation results, it is confirmed that the proposed methods can contribute to the stabilization of the customer voltages and improve the hosting capacity of the PV system in a distribution system. Keywords Micro hydropower generator (MHG) · Hosting capacity for PV system · Optimal voltage control algorithm · Customer voltage · Reactive power control · PSCAD/EMTDC
1 Introduction Recently, the Korean government has pushed a green growth policy as one of the next-generation industries and actively promoted demonstration projects to expand 20% of renewable sources among total energy until 2030 [1]. According to the activity plan of renewable energy sources, local governments and renewable energy * Dae‑Seok Rho [email protected] Hu‑Dong Lee [email protected] Dong‑Hyun Tae [email protected] Ji‑Myung Kim [email protected] 1
Department of Electrical, Electronics and Communication Engineering, Korea University of Technology and Education, Cheonan, Korea
producers are actively installing and operating large scale PV systems in distribution systems [2–4]. However, when a large number of PV systems are installed and operated in a distribution system, many problems related to power quality of voltage fluctuations in distribution system may be occurred [5–7]. In order to solve those problems, the power company has installed SVR in
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