Large scale energy storage

5 Posts

Wat feiten:
De mensheid wil minder fossiele grondstoffen verbranden om de welbekende redenen.
De aarde biedt ons vele vormen van energie die we kunnen omzetten naar, voor ons bruikbare energie.
Zonne-energie, windenergie, getijden- golven geothermische- , etc.
De grootste afname van energie is via landelijke / continentale energienetwerken, in de vorm van elektrische stroom.
Deze hernieuwbare energievormen kennen geen constante opbrengst, en vragen om een opslag medium, dat grootschalig energie kan opslaan voor 12 uur of langer.

Er zijn vele vormen van energie-opslag, en veel systemen kennen grote verliezen, of zijn sterk vervuilend, of alleen op bijzondere plaatsen toepasbaar.

Vanuit vele hoeken krijg ik nu te horen dat Redox flow batteries waarschijnlijk de best mogelijke oplossing gaan geven.
Simpel, niet kostbaar, niet gevaarlijk en niet vervuilend, en met een rendement van meer dan 80%

Bedrijven die er mee bezig zijn, en het al wel/niet toepassen:
Enervault. leuke video om helemaal te beluisteren (niet beursgenoteerd)Eeerste systeem geplaatst (grootste batterij ter wereld)
Nog niet toegepast, belofte is voor eind 2016 toepasbaar
DVC plans 1,500 MW pumped storage facility in Jharkhand

Economic Times reported that Damodar Valley Corporation is planning to set up a 1,500 MW pumped storage facility in Jahrkhand's Bokaro at an estimated cost of INR 5,200 crore. Mr P K Mukhopadhyay chairman said that "We are planning to set up the 1,500 MW pumped storage facility at Lugu Pahar near Bokaro.” He said that "The total project cost is estimated at INR 5,200 crore and it will act as a storage facility for solar power generating units.”

A pre-feasibility study has been completed and a detailed project report will be prepared by an agency at a cost of around INR 40 crore, according to him. The report will be completed in the next two years.

The power utility, along with its partner NTPC Vidyut Vyapar Nigam (NVVN), recently won a supply contract of 300 mw of power for a 15-year time period.

Mr Mukhopadhyay said that "We are prepared for starting supply. We are expecting to start selling power to Bangladesh within a month.”

Responding to a query relating to a public interest litigation filed in the Supreme Court against both these firms, challenging the legalities involved in the bidding process, he said that "We will contest it. We have been supplying power to eight states and we do not have any restrictions in supplying power."

Asked whether the utility will find any difficulties in exporting power generated from domestic coal, he said that "We have a combination of power including sources like thermal, hydro and solar. Our contract with Bangladesh is not based on any specific plant and we will supply from our pool of power."

Source : Economic Times
NREL to Develop a Long-Duration Thermal Energy Storage Technology

ARPA-E has challenged researchers to innovate a storage technology that can be deployed in almost any location and charge and discharge electricity, at a low fixed cost per cycle, for up to 4 days. The DAYS, Duration Addition to electricity Storage, challenge is to supply an unmet market need to provide grid-scale energy storage at a cost comparable to pumped hydro, currently supplying 95 percent of global storage, but that, unlike pumped storage hydro, could be sited anywhere. Among the awardees, the DOE’s National Renewable Energy Laboratory has been funded with USD 2.8 million to realize this concept with a thermal energy storage concept. The NREL proposal is to develop a modular and scalable thermal storage system that can operate at the scale of conventional thermal power stations, from 100MW like a typical natural gas power station or even up to 300MW like a coal power station.

The ARPA-E targeted cost is 5 cents/kWh, which includes a 2.5 cents/kWh projected cost for incoming electricity from solar or wind, so the storage portion must be no more than 2.5 cents/kWh. The NREL team believes that they can meet this target.

Their approach is to use electricity when there is surplus solar or wind, to heat a thermal storage material stored in concrete silos. When electricity is needed, the stored heat is then released to power up turbines and generators to send the stored energy back onto the grid.

The NREL team will test run their thermal system to ensure that it can run off stored energy for up to four days. The long-duration storage being developed under the ARPA-E project is intended to meet a very different need than batteries, which relieve instantaneous transmission congestion, stabilize voltage and frequency levels. DAYS storage must supply reliable low-cost generation over days, that could keep running cycles for many years.

Source : Strategic Research Institute
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