Autonomous Operation of Low Voltage Microgrids

Wasiak, I.; Pawełek, R.; Kelm, Paweł

doi:10.12736/issn.2300-3022.2014413

Cited by 2 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a small-scale active networks, such as the one under study, there are two controllable devices which can serve as grid-forming unit: MT and ESS. Studies [20] shown that in case of ESS the values of voltage amplitude and its frequency significantly depend on generated or consumed power. MT is the better source of reference voltage, as it provides more stable power supply conditions (its static characteristics are stiffer) over a wider load range.…”

Section: A Control Strategymentioning

confidence: 99%

“…MT is the better source of reference voltage, as it provides more stable power supply conditions (its static characteristics are stiffer) over a wider load range. Commercially available CHP can be controlled in both P-Q and U-f modes, however the change from P-Q to U-f control takes a few minutes [20], [21]. The MT is stopped when the supplying voltage fails, then it can be started in stand-alone mode only after this time period.…”

Section: A Control Strategymentioning

confidence: 99%

See 1 more Smart Citation

Forming a microgrid to islanded operation as a mean to improve quality of supply in low voltage networks with distributed generation

Malaczek

Wasiak

2018

2018 18th International Conference on Harmonics and Quality of Power (ICHQP)

Self Cite

View full text Add to dashboard Cite

In this paper a novel concept of improving power quality (PQ) in low voltage networks with distributed generation (DG) is proposed. In contrast to traditional methods which require the application of dedicated resources to compensate for power quality disturbances, the proposed idea is simply to form a microgrid (MG) capable to isolate from the utility grid and operate islanded when a disturbance occur. In the paper conditions for island creation are discussed and a control strategy is presented for a small-scale active network with microturbine, renewable energy sources, loads and storage system. The strategy assumes using energy storage unit as a grid forming unit for islanded operation and a central controller for supervising the network operation in grid-connected and islanded modes. The part of strategy is islanding condition detection method which is based on immunity curve defined for the considered network. Performance of the proposed strategy is presented as a reaction of the network on voltage dips, however the idea is applicable to any PQ disturbance of unacceptable level occurring in the utility grid. For the considered network a simulation model has been developed using PSCAD/EMTDC platform. Simulation results are presented in the paper which illustrate the operation of the control system and show the microgrid behavior after transition from grid-connected to islanded operation mode.

show abstract

Section: A Control Strategymentioning

confidence: 99%

Section: A Control Strategymentioning

confidence: 99%

Forming a microgrid to islanded operation as a mean to improve quality of supply in low voltage networks with distributed generation

Malaczek

Wasiak

2018

2018 18th International Conference on Harmonics and Quality of Power (ICHQP)

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is reasonable therefore for RES to follow a P – Q strategy to maximise output power independently of the MG operation mode. What is more, in commercially available CHP's, the change from P – Q to U – f control, although possible, cannot be performed without interruption, because the MT is stopped when the voltage falls and can begin operating in autonomous mode only after a few minutes [30, 31].…”

Section: Introductionmentioning

confidence: 99%

Improving quality of supply in small‐scale low‐voltage active networks by providing islanded operation capability

Malaczek

Wasiak

Mieński

2019

IET Renewable Power Generation

Self Cite

View full text Add to dashboard Cite

This study presents a novel approach for ensuring the power quality and reliability of supply required for low-voltage networks with distributed energy sources. For this purpose, a control strategy which enables active network uninterrupted transfer to islanded mode and continues its operation when the quality of supply from the utility grid is insufficient is proposed. Islanded operation is initiated based on an immunity curve, which defines the tolerance of the considered system for different voltage disturbances. The proposed strategy is based on expanding the functionality of the energy storage system and the application of a central controller. Moreover, it does not interfere with the method for control of energy sources. An original mechanism was developed and implemented to reserve power and energy in the ESS, enabling the switch to islanded mode at any time. A simulation model of the considered network was developed using the PSCAD/EMTDC platform to verify the proposed strategy. Simulation results illustrating the functioning of the state of charge storage control mechanism and demonstrating the flexible operation of the network in grid-connected and islanded modes are provided. The results clearly confirm the effectiveness of the proposed control strategy for improving the quality and reliability of power supply. critically low, very low, low, critically high, very high and high SOC value, respectively

show abstract

Autonomous Operation of Low Voltage Microgrids

Cited by 2 publications

References 29 publications

Forming a microgrid to islanded operation as a mean to improve quality of supply in low voltage networks with distributed generation

Forming a microgrid to islanded operation as a mean to improve quality of supply in low voltage networks with distributed generation

Improving quality of supply in small‐scale low‐voltage active networks by providing islanded operation capability

Contact Info

Product

Resources

About