Network-constrained thermal unit commitment for hybrid AC/DC transmission grids under wind power uncertainty

Isuru, Mohasha; Hotz, Matthias; Gooi, Hoay Beng; Utschick, Wolfgang

doi:10.1016/j.apenergy.2019.114031

Cited by 19 publications

(7 citation statements)

References 41 publications

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“…[21], [28], [34], [35] [32], [33], [36], [38] Proposed model and load are regarded as the input data. Focus has been placed on the power flow of the ADS and the flexibility of the network such as power flow for AC/DC conversion, SOP, DTR, and DNR.…”

Section: A Modeling Of Ac/dc Hybrid Adssmentioning

confidence: 99%

“…Thus, the initial day-ahead dispatch is transformed into (36). Power flow limits: (1)-( 8) ( 26)-( 28) ( 32) (33) Voltage and current limits: ( 9)-( 11) RDG limits: ( 12)-( 14) ESS and SVC limits: ( 15)-( 20) VSC and SOP limits: ( 21) ( 23) ( 34) ( 35) (36) This equation is an SOCP problem and can be solved using commercial software such as CPLEX and GUROBI.…”

Section: B Solving Day-ahead Dispatchmentioning

confidence: 99%

“…If the DNR is considered hourly, finding a solution to (36) becomes time-consuming and affects the system frequency. If the changes in the RDG output and load between two consecutive hours are minimal, no DNR is required, thereby reducing the aforementioned effect and improving the solving rate.…”

Section: Time Consolidationmentioning

confidence: 99%

“…Multiscale scheduling models have been established for distributed generation (DG) [32], on-load tap changers (OLTCs) [33], and commercial buildings with virtual energy storage [34] in the AC power grid. Two-stage scheduling for AC/DC hybrid ADSs considering DG and electric vehicle (EV) coordination [35] and ESSs [36] has been realized. However, the above studies did not consider the objective error between the actual operation and optimization plan.…”

Section: Introductionmentioning

confidence: 99%

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Two-stage Optimal Dispatching of AC/DC Hybrid Active Distribution Systems Considering Network Flexibility

Teh

2023

Journal of Modern Power Systems and Clean Energy

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The increasing flexibility of active distribution systems (ADSs) coupled with the high penetration of renewable distributed generators (RDGs) leads to the increase of the complexity. It is of practical significance to achieve the largest amount of RDG penetration in ADSs and maintain the optimal operation. This study establishes an alternating current (AC)/direct current (DC) hybrid ADS model that considers the dynamic thermal rating, soft open point, and distribution network reconfiguration (DNR). Moreover, it transforms the optimal dispatching into a second-order cone programming problem. Considering the different control time scales of dispatchable resources, the following two-stage dispatching framework is proposed. ① The day-ahead dispatch uses hourly input data with the goal of minimizing the grid loss and RDG dropout. It obtains the optimal 24-hour schedule to determine the dispatching plans for DNR and the energy storage system. ② The intraday dispatch uses 15 min of input data for 1-hour rolling-plan dispatch but only executes the first 15 min of dispatching. To eliminate error between the actual operation and dispatching plan, the first 15 min is divided into three 5-min step-by-step executions. The goal of each step is to trace the tie-line power of the intraday rolling-plan dispatch to the greatest extent at the minimum cost. The measured data are used as feedback input for the rolling-plan dispatch after each step is executed. A case study shows that the comprehensive cooperative ADS model can release the line capacity, reduce losses, and improve the penetration rate of RDGs. Further, the two-stage dispatching framework can handle source-load fluctuations and enhance system stability. Times of distribution network reconfiguration (DNR) in the day-ahead dispatchBinary variables that indicate the power direction through branch (i,j) during period t Equivalent load demand of active distribution system (ADS) in hour [ζ, ζ + 1] Equivalent load average value in segmentActive and reactive power through branch (j,i)period t Active and reactive power injections at node i during period t Active power injection at node n during period t Active and reactive power injections at node i by substation and renewable distributed generators (RDGs) during period t Active power injection at node n by RDGs duringperiod t Active and reactive power outflowing from node i to load, voltage source converter (VSC), and soft open point (SOP) during period t Active power outflowing from node n to load during period t Active power injection at node i by the AC grid through VSC Active power injections from energy storage systems (ESSs) at node s, n, i during period t Active power outflowing to ESSs at node s, n, i during period t Dropout of RDG during period t Reactive power injection by static var generator (SVG) at node i during period t Reactive power flowing out from ideal VSC Convection heat loss parameter, radiated heat loss parameter, and total solar and sky radiated heat parameter AC resistance of conductor at temperatur...

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Section: A Modeling Of Ac/dc Hybrid Adssmentioning

confidence: 99%

Section: B Solving Day-ahead Dispatchmentioning

confidence: 99%

Section: Time Consolidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-stage Optimal Dispatching of AC/DC Hybrid Active Distribution Systems Considering Network Flexibility

Teh

2023

Journal of Modern Power Systems and Clean Energy

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“…• Power transmission over long distances [19]: Considering the effectiveness of high and medium-voltage DC lines, more power may be transferred over long distances, compared to their AC counterparts, owing to less severe stability issues. This feature makes DC integration into already existing AC grids extremely valuable for the future expansion of the grid and the connection of remote loads (such as in islands or isolated locations) or remote RES installations [20]. Major technological developments have enabled the increase of DC operating voltage levels in the order of kV, allowing efficient and reliable power transfer even for distances in the order of several thousands of kilometers.…”

Section: Driving Forces and Challenges For The Development Of Ac/dc Hybrid Smart Microgridsmentioning

confidence: 99%

A Review on the Driving Forces, Challenges, and Applications of AC/DC Hybrid Smart Microgrids

Fotopoulou¹,

Rakopoulos²,

Stergiopoulos³

et al. 2023

Smart Grids Technology and Applications

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The majority of Medium Voltage (MV) and Low Voltage (LV) power systems are based on and operate using Alternating Current (AC) infrastructures. Yet, modern energy market needs, which promote more decentralized concepts with a high Renewable Energy Sources (RES) penetration rate and storage integration, bring Direct Current (DC) to the forefront. In this sense, AC/DC hybrid smart microgrids constitute a newly-introduced research field with a variety of potential applications that combine the benefits of both AC and DC systems. The purpose of this chapter is to review the advantages and disadvantages of AC/DC hybrid grids and analyze potential applications that would benefit from such infrastructures. Also, the most significant efforts and requirements for the constitution of a solid regulatory framework for AC/DC hybrid grids are presented, to pave the way towards their wider adoption by the market.

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A hybrid algorithm for the unit commitment problem with wind uncertainty

et al. 2021

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Network-constrained thermal unit commitment for hybrid AC/DC transmission grids under wind power uncertainty

Cited by 19 publications

References 41 publications

Two-stage Optimal Dispatching of AC/DC Hybrid Active Distribution Systems Considering Network Flexibility

Two-stage Optimal Dispatching of AC/DC Hybrid Active Distribution Systems Considering Network Flexibility

A Review on the Driving Forces, Challenges, and Applications of AC/DC Hybrid Smart Microgrids

A hybrid algorithm for the unit commitment problem with wind uncertainty

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