Coordination of Battery Energy Storage and Power-to-Gas in Distribution Systems
Author
Trifonov, Teodor Ognyanov
Term
4. term
Education
Publication year
2017
Submitted on
2017-01-09
Abstract
Denne afhandling adresserer den stigende integration af vedvarende energi ved at undersøge, hvordan et batteri-energilagringssystem (ESS) kan koordineres med et Power-to-Gas (PtG) anlæg i distributionsnet for at udnytte deres komplementære styrker. Arbejdet omfatter en gennemgang af relevante ESS- og PtG-teknologier og deres roller i elsystemet, samt opstilling af stationære modeller af vind- og solproduktion, elnettet, PtG-processen og det tilknyttede gasnet. Der udvikles lade-strategier for ESS og produktionsstrategier for PtG, og flere metoder til størrelsessætning af ESS undersøges, herunder baseret på overskudsproduktion, elpriser og elektrokemiske begrænsninger, samt i samspil med PtG. Gasnettet simuleres med Newton-Raphson, og belastningsestimering og regulering (bl.a. for gaskraftenheder) behandles med Kalman-filter og mindst kvadraters metoder. Resultaterne viser, at overskudsenergi fra vedvarende kilder kan lagres og omdannes til metan via PtG, og at en hensigtsmæssig ladningsstrategi kan reducere den nødvendige kapacitet af batterilageret. Dette peger på, at koordineret drift af ESS og PtG kan understøtte en mere effektiv og fleksibel drift af distributionssystemer med høj VE-andel.
This thesis addresses the growing integration of renewable energy by investigating how a battery energy storage system (ESS) can be coordinated with a Power-to-Gas (PtG) unit in distribution networks to leverage their complementary strengths. The work reviews relevant ESS and PtG technologies and grid roles, and develops steady-state models of wind and solar generation, the electrical network, the PtG process, and the associated gas network. Charging strategies for the ESS and production strategies for PtG are designed, and several ESS sizing approaches are explored, including surplus-power and price-based methods, electrochemical constraints, and coordination with PtG. The gas network is simulated using the Newton–Raphson method, and load estimation and control (including for gas-powered generation) are addressed with Kalman filtering and least-squares techniques. The results indicate that surplus renewable energy can be stored and further converted to methane via PtG, and that appropriate charging strategies can reduce the required battery capacity. Overall, coordinating ESS and PtG shows promise for more efficient and flexible operation of distribution systems with high shares of renewables.
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