A Fault Analysis on AC Microgrid with Distributed Generations

Shin, Seong Su; Oh, Joon Seok; Jang, Su Hyeong; Chae, Woo Kyu; Park, Jong Ho; Kim, Jae Eon

doi:10.5370/jeet.2016.11.6.1600

Cited by 5 publications

(5 citation statements)

References 7 publications

(8 reference statements)

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“…Finally, the paper aims at verifying whether IPSs currently defined by present standards are adequate to identify unintentional islanding in the case storage units with stabilizing functions are connected to the LV distribution grid. Results are comparable with similar studies obtained according with Korean connection codes [26].…”

supporting

confidence: 91%

“…functions are connected to the LV distribution grid. Results are comparable with similar studies obtained according with Korean connection codes [26]. In the following, Section 2 recalls the requirements currently applied to DG units, in terms of both stabilizing functions and IPS characteristics, whereas Section 3 discusses the ESS stabilizing functions, considering AC interfaced storage units and ESS connected to the DC side of the generating unit converter.…”

Section: P/f and Q/v Regulationssupporting

confidence: 72%

See 1 more Smart Citation

Effects of Energy Storage Systems Grid Code Requirements on Interface Protection Performances in Low Voltage Networks

Bignucolo

Cerretti²,

Coppo

et al. 2017

Energies

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Abstract:The ever-growing penetration of local generation in distribution networks and the large diffusion of energy storage systems (ESSs) foreseen in the near future are bound to affect the effectiveness of interface protection systems (IPSs), with negative impact on the safety of medium voltage (MV) and low voltage (LV) systems. With the scope of preserving the main network stability, international and national grid connection codes have been updated recently. Consequently, distributed generators (DGs) and storage units are increasingly called to provide stabilizing functions according to local voltage and frequency. This can be achieved by suitably controlling the electronic power converters interfacing small-scale generators and storage units to the network. The paper focuses on the regulating functions required to storage units by grid codes currently in force in the European area. Indeed, even if such regulating actions would enable local units in participating to network stability under normal steady-state operating conditions, it is shown through dynamic simulations that they may increase the risk of unintentional islanding occurrence. This means that dangerous operating conditions may arise in LV networks in case dispersed generators and storage systems are present, even if all the end-users are compliant with currently applied connection standards.

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supporting

confidence: 91%

Section: P/f and Q/v Regulationssupporting

confidence: 72%

Effects of Energy Storage Systems Grid Code Requirements on Interface Protection Performances in Low Voltage Networks

Bignucolo

Cerretti²,

Coppo

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

“…Generally, power systems have all three types of load. The voltage V is of the islanding condition can be expressed as shown in Equation (2) when DG with constant power is connected to a load with constant impedance [38,39].…”

Section: Power Quality Problems During Islanding Operationmentioning

confidence: 99%

Temporary Fault Ride-Through Method in Power Distribution Systems with Distributed Generations Based on PCS

et al. 2020

Self Cite

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The current practice of Distributed Generation (DG) disconnection for every fault in distribution systems has an adverse effect on utility and stable power trading when the penetration level of DGs is high. That is, in the process of fault detecting and Circuit Breaker (CB) reclosing when a temporary fault occurs, DGs should be disconnected from the Point of Common Coupling (PCC) before CB reclosing. Then all DGs should wait at least 5 minutes after restoration for reconnection and cannot supply the pre-bid power in power market during that period. To solve this problem, this paper proposes a control method that can keep operating without disconnection of DG. This control method is verified through modeling and simulation by the PSCAD/EMTDC software package for distribution systems with DGs based on PCS (Power Conditioning Systems) and CB reclosing protection.

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“…From 3000 kw 1. 5 Installing floats on the surface of the retainer PV System + EESS 5.0 EESS (PV system connection) '16, '17, 18 The islanding of grid-connected distributed systems such as PV, EESS, and wind power occurs when a section of the utility system containing such distributed systems are disconnected from the main utility voltage source [22].…”

Section: If You Are On Regular Groundsmentioning

confidence: 99%

“…As the supply of renewable energy is expanding globally, the amount of distributed power sources (e.g., solar photovoltaic (PV) and wind power) connected to the power grid is also rapidly increasing [1]. In addition, a number of studies related to distributed power connections have been conducted [2][3][4][5][6][7]. The inclusion of distributed power sources such as PV and wind power [8][9][10] could degrade power quality due to fluctuations of their output power.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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A Fault Analysis on AC Microgrid with Distributed Generations

Cited by 5 publications

References 7 publications

Effects of Energy Storage Systems Grid Code Requirements on Interface Protection Performances in Low Voltage Networks

Effects of Energy Storage Systems Grid Code Requirements on Interface Protection Performances in Low Voltage Networks

Temporary Fault Ride-Through Method in Power Distribution Systems with Distributed Generations Based on PCS

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

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