Low-Voltage DC Distribution—Utilization Potential in a Large Distribution Network Company

Hakala, Tomi; Lähdeaho, Tommi; Järventausta, Pertti

doi:10.1109/tpwrd.2015.2398199

Cited by 106 publications

(41 citation statements)

References 23 publications

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“…Potential pathways for increased use of dc technology in buildings was considered in [3]. A more practical approach was presented in [2] where a case study for a large distribution network was considered.…”

Section: Brief State Of the Artmentioning

confidence: 99%

Uniqueness of the power flow solutions in low voltage direct current grids

Garcés

2017

Electric Power Systems Research

102

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Power flow in a low voltage direct current grid (LVDC) is a non-linear problem just as its counterpart ac. This paper demonstrates that, unlike in ac grids, convergence and uniqueness of the solution can be guaranteed in this type of grids. The result is not a linearization nor an approximation, but an analysis of the set of non-linear algebraic equations, which is valid for any LVDC grid regardless its size, topology or load condition. Computer simulation corroborate the theoretical analysis.

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Section: Brief State Of the Artmentioning

confidence: 99%

Uniqueness of the power flow solutions in low voltage direct current grids

Garcés

2017

Electric Power Systems Research

102

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“…The average annual investment cost coefficient of the DG is 0.1, and the power factor is 0.85. Considering the proportion of the DC load in each load node, the candidate nodes for the DG are 7,10,12,13,14,16,17,18,19,20,22,23,24,25,26,29,30,31, and 32. The minimum unit capacity of the grid-connected DG is 60 kVA, and if the grid-connected cardinal number is m (m = 0, 1, 2, .…”

Section: Node Proportion Of DC Load Node Proportion Of Dc Loadmentioning

confidence: 99%

Multi-Objective Coordinated Planning of Distributed Generation and AC/DC Hybrid Distribution Networks Based on a Multi-Scenario Technique Considering Timing Characteristics

et al. 2017

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With increased direct current (DC) load density and the penetration of a large number of distributed generation (DG) units in alternating current (AC) distribution networks (DNs); a planning approach that considers transforming some of the AC lines into DC lines and building the DC network is proposed. Considering the DG output uncertainty and the load fluctuation, a planning model for an AC/DC hybrid distribution network (DN) with the DG based on the construction of multi-scenario technology with timing characteristics is built. In the DG configuration planning model, the lines to be transformed into DC form the access location and the decision regarding the DC or AC form of the newly built lines are considered optimizing variables. The DG investment, the network and converters of the DG and load, the active power loss and the voltage stability are considered in the objective functions. An improved adaptive niche genetic algorithm based on the fuzzy degree of membership and variance weighting is used to solve the nested model. Finally, considering the improved electrical and electronic engineers 33 (IEEE33) node system as an example, the correctness and effectiveness of the proposed planning method are verified. Compared to the plan without transforming some of the AC lines into DC lines and building a DC network, more DG can be admitted, and the economic cost of the AC/DC hybrid DN is notably decreased when planning to transform some of the AC lines into DC lines and build a DC network. The active power network loss and the voltage stability index are similarly further optimized.

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“…To this end, flexible and accurate power flow control and increasing DER hosting capability offered by medium-voltage direct-current (MVDC) has become a valuable alternative solution for the intractable challenges in the distribution networks [1]- [3]. Inserting new MVDC links and/or converting existing MVAC lines to MVDC operation have been considered as an emerging approach to uprate the transmission capability [5]- [7]. At present, voltage source converter (VSC) based MVDC technology is widely used in traction applications, shipboard power systems and is identified as a feasible option for offshore wind power collection systems and micro-grid applications [11]- [13].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Average Converter Model for MVDC Link Harmonic Analysis

Joseph

Balasubramaniam

et al. 2019

2019 IEEE Milan PowerTech

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Medium-voltage direct-current (MVDC) technology has been widely considered as a key enabler to generate, convert and dispense electrical power with enhanced connectivity, security and quality. However, with the significant deployment of power electronics converters with high-switching frequency in MVDC systems, accurate analysis of system dynamic behavior such as harmonic distortions have become a computationally intensive task. To address these challenge average models of converters have been proposed to facilitate faster computation. However, these models only capture the steady-state characteristics of the system. To this end, in this paper, three types of time-domain based converter models: detailed, average and switching average models are presented for harmonic studies. The suitability of the modelling fidelity in reducing substantial simulation time has been validated with a practical converter topology used for the first MVDC link in Europe. Simulation based on the switching average model is shown to provide all relevant information as obtained from the detailed switching model while consuming considerably less computation time than the latter.

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Low-Voltage DC Distribution—Utilization Potential in a Large Distribution Network Company

Cited by 106 publications

References 23 publications

Uniqueness of the power flow solutions in low voltage direct current grids

Uniqueness of the power flow solutions in low voltage direct current grids

Multi-Objective Coordinated Planning of Distributed Generation and AC/DC Hybrid Distribution Networks Based on a Multi-Scenario Technique Considering Timing Characteristics

Dynamic Average Converter Model for MVDC Link Harmonic Analysis

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