Flexible load management in Smart-grids
Translated title
Fleksibelt effekt kontrol i Smart-grids
Author
Rodriguez Moldes, Eloy
Term
4. term
Education
Publication year
2013
Abstract
This thesis investigates the implementation of flexible load management (demand-side management) in a residential area. It focuses on household loads with time-shifting potential—washing machines and refrigerators—by characterizing their use patterns and operational constraints. Using the Matlab Optimization Toolbox, optimal control schedules are computed to minimize distribution line losses and customers’ electricity costs. The optimized appliance operation is then applied to a distribution grid model in DIgSILENT to evaluate line-loss reduction and impacts on power quality. The report details the problem formulation, energy cost and loss functions, selected constraints and solver choices, and residential case studies. Simulation results indicate that coordinated control of flexible loads can reduce line losses and lower costs while meeting appliance requirements and considering power quality.
Dette speciale undersøger implementeringen af fleksibel laststyring (Demand Side Management) i et boligområde. Fokus er på husholdningsapparater med mulighed for tidsforskydning – vaskemaskiner og køleskabe – hvor deres brugsprofiler og driftsbegrænsninger karakteriseres. Ved hjælp af Matlab Optimization Toolbox udledes optimale styringsplaner med det formål at reducere tab i distributionsnettet og sænke kundernes elomkostninger. De optimerede køreplaner implementeres efterfølgende i en model af elnettet i DIgSILENT for at evaluere reduktion af linjetab og påvirkningen af elkvalitet. Rapporten beskriver problemformulering, omkostnings- og tabfunktioner, valgte begrænsninger og solvervalg samt boligrelaterede cases. Simuleringsresultaterne indikerer, at koordineret styring af fleksible laster kan mindske linjetab og reducere omkostninger, samtidig med at apparatkrav respekteres og elkvaliteten tages i betragtning.
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