Experiences from a back-to-back converter fed village microgrid

Niiranen, J.; Komsi, Reijo; Routimo, Mikko; Lähdeaho, Tommi; Antila, S.

doi:10.1109/isgteurope.2010.5638991

Cited by 25 publications

(12 citation statements)

References 6 publications

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“…1) Apparent power: When a high-power converter is feeding the public network, the nominal current of the converter is adequate to supply a short-circuit current that is almost equal to the nominal current as shown in [21]. The low short-circuit current to nominal current ratio (I sc /I n ) makes the converter design easier as there is no need for overrating the components especially for short-circuit operation unlike in high current ratio converters.…”

Section: B Short-circuit Current Levelmentioning

confidence: 98%

Short-Circuit Protection in a Converter-Fed Low-Voltage Distribution Network

Nuutinen

Peltoniemi

Silventoinen

2013

IEEE Trans. Power Electron.

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The short-circuit protection of a low-power converter-fed low-voltage DC distribution network is investigated. In a public distribution network, the short-circuit protection is implemented by using fuses and circuit breakers, which may require a current that is over ten times the nominal currents of low-power DC/AC converter units to satisfy the recommendations. In the paper, the operation of the converter in a short circuit is studied, and the control scheme for the short-circuit current control and the fault ride through (FRT) operation is proposed. The operation of the short-circuit control scheme is verified by measurements. To overcome the problem of high fault current injection, alternative short-circuit protection realizations that are based on a simple low-current compact circuit breaker (but are not approved in standards) are proposed and demonstrated by measurements.

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Section: B Short-circuit Current Levelmentioning

confidence: 98%

Short-Circuit Protection in a Converter-Fed Low-Voltage Distribution Network

Nuutinen

Peltoniemi

Silventoinen

2013

IEEE Trans. Power Electron.

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“…The scheme consists of different parts: dedicated units, using DG units as parallel APFs, and back-up support connected to the main grid through a backto-back converter (ABB-ACS 800). The back-to-back converter is used to test for the presence of power quality problems in grid-connected MGs, and to improving them [96]. As mentioned in the Introduction and in Section 2, the target of this paper is a technical evaluation of microgrids.…”

Section: Power Qualitymentioning

confidence: 99%

Microgrids in active network management – part II: System operation, power quality and protection

Palizban

Kauhaniemi

Guerrero

2014

Renewable and Sustainable Energy Reviews

108

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Abstract. The development of distribution networks for participation in active network management (ANM) and smart grids is introduced using the microgrid concept. In recent years, this issue has been researched and implemented by many experts. The second part of this paper describes those developed operational concepts of microgrids that have an impact on their participation in ANM and in the requirements for achieving targets. Power quality is the most challenging task in microgrids, especially when the system switches from normal parallel operation (grid-connection mode) to island operation. Indeed, following planned or unplanned transitions to island mode, microgrids may develop instability. For this reason, the paper addresses the principles behind island-detection methods, black-start operation, fault management, and protection systems, along with a comprehensive review of power quality.Finally, island detection and the other topics are summarized with a flowchart and tables.

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“…The Ross Island project has built a physical dual frequency (50 Hz and 60 Hz) interlinked system by using a microgrid control distributed system [20]. Several researchers have proposed the use of BTB converters for connecting MG systems with the utility grid, in which the bidirectional power flow between the MG system and the grid can be easily regulated [21][22][23][24]. The topology of the hybrid MG system with DC connection at the BTB converter presented in [22] could bring the benefit of multiple AC and DC MGs integration at a common point.…”

Section: Introductionmentioning

confidence: 99%

“…The topology of the hybrid MG system with DC connection at the BTB converter presented in [22] could bring the benefit of multiple AC and DC MGs integration at a common point. The use of the BTB converter can not only improve the power quality [23], but also limit the fault current in the MG system [24]. Interconnected multiple MG systems can support each other during contingencies by using the modified angle droop control strategy for the BTB converter [25].…”

Section: Introductionmentioning

confidence: 99%

Multi-Frequency Control in a Stand-Alone Multi-Microgrid System Using a Back-To-Back Converter

2017

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Abstract:A stand-alone multi-microgrid (MMG) system can be formed by connecting multiple stand-alone microgrids (MGs). In the stand-alone MMG system where the frequencies of each MG system are different, a back-to-back (BTB) converter can be used for interconnecting the adjacent MG system. The frequency control performance of the MMG system can be improved by designing the suitable controller of the BTB converter. This study proposes a multi-frequency control in the BTB converter to improve the performance of frequency regulation in the MMG system. Autonomous power sharing between each MG system is achieved by using the proposed multi-frequency control. The stand-alone MMG system where two stand-alone MG systems with different nominal frequencies are interconnected using the BTB converter is simulated in this study to show the feasibility of the proposed multi-frequency controller. Each stand-alone MG system consists of an inverter-based distributed generator (DG) that uses a grid-forming converter with a conventional frequency droop controller. The inverter-based DG is responsible for the primary frequency control in each MG system. To show the effectiveness of the proposed multi-frequency control, a comparison study of the multi-frequency control and the single frequency control is presented in this study. Simulation results show that the system stability can be improved by using the proposed multi-frequency controller.

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Experiences from a back-to-back converter fed village microgrid

Cited by 25 publications

References 6 publications

Short-Circuit Protection in a Converter-Fed Low-Voltage Distribution Network

Short-Circuit Protection in a Converter-Fed Low-Voltage Distribution Network

Microgrids in active network management – part II: System operation, power quality and protection

Multi-Frequency Control in a Stand-Alone Multi-Microgrid System Using a Back-To-Back Converter

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