Case Studies for Non-Detection of Islanding by Grid-Connected In-Parallel Photovoltaic and Electrical Energy Storage Systems Inverters

In Korea, there is a rule for Renewable Energy Certification with weighting 5.0, to expand grid linkage capacity and to improve the stability of the grid to accommodate photovoltaic (PV) systems in a distributed power system. Due to this rule, many power companies and operators are trying to install...

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Bibliographic Details
Published inApplied sciences Vol. 9; no. 5; p. 817
Main Authors Lim, Jong, Hwang, Hye, Shin, Woo, Song, Hyung-Jun, Ju, Young-Chul, Jung, Young, Kang, Gi, Ko, Suk
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 2019
Subjects
Alternative energy sources
anti-islanding
anti-islanding detect
Case studies
EESS inverter
Electric power distribution
Electric power systems
Electricity distribution
Energy conversion
Energy storage
Generators
Inverters
Islands
Methods
Photovoltaics
PV inverter
PV system
Quality standards
Solar cells
Storage systems
Systems stability
Wind power
United States > US
Russia
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Summary:In Korea, there is a rule for Renewable Energy Certification with weighting 5.0, to expand grid linkage capacity and to improve the stability of the grid to accommodate photovoltaic (PV) systems in a distributed power system. Due to this rule, many power companies and operators are trying to install electrical energy storage systems that are able to operate in conjunction with PV system power. These systems operate in parallel at the same grid connection point. This paper presents the results of case studies on the failure to detect islanding operation. Test evaluation devices that could be bi-directionally charged and discharged were implemented for an islanding detection test. Testing was conducted under a variety of operating conditions. When a single inverter was operated under the islanding condition, it was stably stopped within 0.5 s using the Korean grid-code standard. However, when two inverters were operated at the same time under the islanding condition, islanding detection failed and the two inverters continued to feed the connected RLC (resistor, inductor, capacitor) loads in the isolated section known as an island. Different algorithms used by PCS (power conversion system) manufacturers to detect islanding might cause this phenomenon. Therefore, it is necessary for a new PCS test standard to detect islanding.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9050817