Mitigation of Unbalanced Voltage Sags and Voltage Unbalance in CIGRE Low Voltage Distribution Network

Bhutto, Ghullam Mustafa; Bak‐Jensen, Birgitte; Mahat, Pukar; Cecati, Carlo

doi:10.4236/epe.2013.59060

Cited by 8 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The DERs (include PVs and ESSs) are required to operate with a fixed power factor of 0.95. Specifically, the ANSI standard recommends that the electric supply system should be made and function to limit the maximum voltage unbalance to 3% [69]. Four PVs are installed at buses 806 (three-phase, 300 kW), 818 (phase C, 300 kW), 820 (phase C, 600 kW) and 822 (phase C, 600 kW).…”

Section: Case Studymentioning

confidence: 99%

New phase‐changing soft open point and impacts on optimising unbalanced power distribution networks

Lou

Yang

et al. 2020

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

Three-phase unbalanced conditions in distribution networks are conventionally caused by load imbalance, asymmetrical fault conditions of transformers and impedances of three phases. The uneven integration of single-phase distributed generation (DG) worsens the imbalance situation. These unbalanced conditions result in financial losses, inefficient utilisation of assets and security risks to the network infrastructure. In this study, a phase-changing soft open point (PC-SOP) is proposed as a new way of connecting soft open points (SOPs) to balance the power flows among three phases by controlling active power and reactive power. Then an operational strategy based on PC-SOPs is presented for three-phase four-wire unbalanced systems. By optimising the regulation of SOPs, optimal energy storage systems dispatch and DG curtailment, the proposed strategy can reduce power losses and three-phase imbalance. Second-order cone programming (SOCP) relaxation is utilised to convert the original non-convex and non-linear model into an SOCP model which can be solved efficiently by commercial solvers. Case studies are conducted on a modified IEEE 34-node three-phase four-wire system and the IEEE 123node test feeder to verify the effectiveness, efficiency and scalability of the proposed PC-SOP concept and its operational strategy.MAX maximum active and maximum reactive powers of DER at node i at time t * conjugate transpose

show abstract

Section: Case Studymentioning

confidence: 99%

New phase‐changing soft open point and impacts on optimising unbalanced power distribution networks

Lou

Yang

et al. 2020

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

show abstract

“…phase A) becomes zero when the fault appears on time equal t = 5 s. The voltages in the healthy phases increase during the fault and come back to the steady state value when the fault is cleared. The detailed explanation about the rise of the voltage in the healthy phases during the fault has been presented by the authors in [23].…”

Section: Protection Of the Cigre Network Against Single Phase To Groumentioning

confidence: 99%

Protection of Low Voltage CIGRE Distribution Network

Bhutto¹,

Bak‐Jensen²,

Bak³

et al. 2013

SGRE

Self Cite

View full text Add to dashboard Cite

High quality electricity services are the prime objectives in the modern power systems around the world. One of the main players to achieve this is the protection of the system which needs to be fast, reliable and cost effective. The study about the protection of the Low Voltage (LV) CIGRE distribution grid and networks like this has been proposed in this paper. The main objective of this paper is to develop protection against short circuit faults which might appear anywhere in the network. The protection of the power networks that comprises of renewable energy generation units is complicated because of the bidirectional flow of the current and is a challenge for the protection engineers. The selection of the protection devices in this paper is made to protect the network against faults in grid connected and island mode of operation. Ultra-fast fuses are proposed in order to protect the inverters used for Photovoltaic (PV) and battery applications. The disconnection of the PV solar panels when in island mode is made by proposing switch disconnecting devices. ABB is currently using these kinds of disconnection devices for the purpose of protecting solar panels against over voltages in the case of islanding. The over speed protection of the existing Wind Turbine Generator (WTG) in the CIGRE network in case of grid loss is also proposed in this paper.

show abstract

“…The increasing interest in research work to improve efficiency and eliminate voltage deviation in distribution network feeding industries has resulted development of custom power device. The recent innovation in custom power devices like [7]. Dynamic Voltage Restorer (DVR), Distribution Static Compensator (D-STATCOM), and Unified Power Quality Conditioner (UPQC), has help to compensate imbalances experienced in distribution networks with low cost.…”

Section: Introductionmentioning

confidence: 99%

Mitigating Effects of Voltage Deviation on Delsuth Health Care Facility Utilizing Dynamic Voltage Restorer (Dvr)

PATRICK¹,

OSHEVIRE²

2022

JESR

View full text Add to dashboard Cite

This paper examined power supply at DELSUTH with the aim of mitigating effects of voltage deviation. The 11KV feeder from 7.5MVA substation which supplies the Hospital was analyzed using Dynamic Voltage Restorer (DVR) device on ETAP 16.0 software environment. It was observed that load flow analysis is vital in understanding the operating nature of the network, by considering the reactive power, voltage deviation magnitude and power losses in the network. From the simulation there was low voltage profile in the transformers feeding the clinical area. The voltage profile was improved by upgrading the network to standard power factor.

show abstract

Mitigation of Unbalanced Voltage Sags and Voltage Unbalance in CIGRE Low Voltage Distribution Network

Cited by 8 publications

References 21 publications

New phase‐changing soft open point and impacts on optimising unbalanced power distribution networks

New phase‐changing soft open point and impacts on optimising unbalanced power distribution networks

Protection of Low Voltage CIGRE Distribution Network

Mitigating Effects of Voltage Deviation on Delsuth Health Care Facility Utilizing Dynamic Voltage Restorer (Dvr)

Contact Info

Product

Resources

About