Potential and strategic role of power electronics in electricity distribution systems

Lassila, Jukka; Kaipia, Tero; Haakana, Juha; Partanen, Jarmo; Koivuranta, Kari

doi:10.1049/cp.2009.0918

Cited by 17 publications

(9 citation statements)

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“…The objectives are approached from two main viewpoints: The converter level and the distribution system level. The total costs of the LVDC distribution are approached further in paper [1]. …”

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confidence: 99%

Impact of low voltage DC system on reliability of electricity distribution

Kaipia

Peltoniemi

Lassila

et al. 2009

IET Conference Publications

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Power electronic converters have growing importance in electricity distribution, generation, and in energy use. Therefore, it is relevant to study how the shorter lifetimes of power electronics compared to the traditional network components affect on the reliability of the electricity distribution and to its total costs. The main contribution of this paper is related to defining the impact of the low voltage DC (LVDC) distribution system on the reliability of electricity distribution and dependencies between the supply quality experienced by the customers and the reliability of power electronics. A methodology is introduced for evaluating the development of supply reliability and defining the limits of the converter reliability. The proposed methodology is used in presented example studies. The objectives are approached from two main viewpoints: The converter level and the distribution system level. The total costs of the LVDC distribution are approached further in paper [1].

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confidence: 99%

Impact of low voltage DC system on reliability of electricity distribution

Kaipia

Peltoniemi

Lassila

et al. 2009

IET Conference Publications

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“…Failure rate λ is considered 0.1 f/year.km, failure duration is considered 4 h per fault, MV feeder installation cost of conductor types one (Cat), two (Otter) and three (Raccoon) are considered 15,000, 10,000 and 5000 $/km. Cost for MV/LV and DC substations, based on their transformer and converter rating are used from [1][2][3], [6] and [9]. Interest and inflation rate are assumed as 18% and 15%, respectively.…”

Section: Computational Resultsmentioning

confidence: 99%

“…The demand for higher quality and reliability of power distribution system, role of distribution system in reducing losses and pollutions have increased requirement for utilization of power electronic devices in distribution systems [1]. The low voltage DC distribution (LVDC) system is one of the latest primary technological innovations in electricity distribution and an interesting challenger to the AC low voltage networks.…”

Section: Introductionmentioning

confidence: 99%

Integrated AC/DC network planning

Mousavizadeh

Haghifam

2013

22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013)

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Proliferation of DC output type Distributed Energy Resource (DER) units in the utility power systems, mostly at the distribution voltage levels, and also recent advancement in the power electronics devices have motivated the integration of DC microgrids as an integral part of AC grids. LVDC system is one of the newest technologies in the field of distribution networks. In this paper, economic design of hybrid AC/DC distribution networks are studied for bipolar LVDC system configurations, area with different load densities and different penetrations of distributed generation sources, considering various kinds of loads. Optimal connection configuration of load points and Distributed Generations to the AC and DC substations candidate points is determined by genetic algorithm considering investment, loss and also customer interruption costs. Afterward, final structure of network is designed by branch exchange method.

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“…For instance, the distribution system operator from Finland carried out a feasibility study that concluded that low voltage DC (LVDC) electrical lines with lengths up to 8 km long can replace the existing AC infrastructure, with several advantages, among which, to increase the power transfer capacity up to 20% [17]. Other specialists concluded also that replacing medium voltage (MV) AC lines with DC lines can result in significant investment savings because of fewer induction transformers needed in the distribution grid [18]. Such vision is also a strong reason for deploying SSTs in future grid configurations, because they could easily allow access to a DC link.…”

Section: Introductionmentioning

confidence: 99%

Resilient and Immune by Design Microgrids Using Solid State Transformers

et al. 2018

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Solid State Transformers (SST) may become, in the near future, key technological enablers for decentralized energy supply systems. They have the potential to unleash new technologies and operation strategies of microgrids and prosumers to move faster towards a low carbon-based economy. This work proposes a paradigm change in the hierarchically and distributed operated power systems where SSTs are used to asynchronously connect the many small low voltage (LV) distribution networks, such as clusters of prosumers or LV microgrids, to the bulk power system. The need for asynchronously coupled microgrids requires a design that allows the LV system to operate independently from the bulk grid and to rely on its own control systems. The purpose of this new approach is to achieve immune and resilient by design configurations that allow maximizing the integration of Local Renewable Energy Resources (L-RES). The paper analyses from the stability point of view, through simplified numerical simulations, the way in which SST-interconnected microgrids can become immune to disturbances that occur in the bulk power system and how sudden changes in the microgrid can damp out at the Point of Common Coupling (PCC), thus achieving better reliability and predictability in both systems and enabling strong and healthy distributed energy storage systems (DESSs). Moreover, it is shown that in a fully inverter-based microgrid there is no need for mechanical or synthetic inertia to stabilize the microgrid during power unbalances. This happens because the electrostatic energy stored in the capacitors connected behind the SST inverter can be used for a brief time interval, until automation is activated to address the power unbalance for a longer term.

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Potential and strategic role of power electronics in electricity distribution systems

Cited by 17 publications

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Impact of low voltage DC system on reliability of electricity distribution

Impact of low voltage DC system on reliability of electricity distribution

Integrated AC/DC network planning

Resilient and Immune by Design Microgrids Using Solid State Transformers

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