Energy Storage - Yieldworks

Yieldworks is a modelling system developed by LHW Partnership LLP that assesses and optimises the most effective solar PV system array sizing by accommodating a combination of export constraint limitation, on-site projected or historic half hourly consumption, battery technology and predicted solar PV yields.

 

The Yieldworks model can be used for assessing the feasibility of solar PV and wind systems to provide realistic appraisals of system size options and constraint levels. with a given system size and location, historic or projected site demand and export capacity constraint, the optimial system can be modelled and appraised based on a number of possible scenarios. The model accomodates non storage as well as energy storage systems modelled up to 1 minute intervals, and can model both DUOS and fixed tariff arrangments. 

 

Partners at LHW Partnership LLP have been involved with PV battery systems since 1999, when the majority of PV was off grid, and though modern storage technolog is moving away from Lead  Acid, there are few organisation in the UK with this  longevity of experience.  

SYSTEM APPRAISALS

Using industry leading modelling software and shade analysis technology, the project can be modelled from total to constrained export scenarios, allowing for shading, on-site demands, private wire and future peak generation storage offset.

 

•      Maximum non constrained yield analysis

•      Shading appraisal

•      Additional PV capacity for existing intermittent DG sites

•      P50/P75/P90/P95 yield assessments

•      ESOS grade energy management surveys

•      Site consumption modelling (1/2 hourly, 1/4 hourly, estimated)

•      Hourly load variance sensitivity analysis

MODELLING & INVESTMENT APPRAISALS

 

•     Constrained Yield appraisals

•     Energy Management improvement audits

•     Electric Renewable Heat technology solutions (Heat Pumps/ Storage Heaters)

•     On site energy storage options

•     Investment appraisal

 

FUTURE PROOFING

 

•     Future development strategy modelling

•     Technology analysis

Yieldworks Projects

Wind Turbine - Arnold White Estates Ltd.

 

LHW Partnership was commissioned by Arnold White Estates Ltd. to model the half-hourly generation profile of a wind turbine located in Bedfordshire against the half-hourly demand profile of a local aggregate company in order to determine the feasibility of a Power Purchase Agreement.

 

The modelling was undertaken using our Yieldworks methodology and the analysis concluded that 76% of the aggregate’s site consumption could be met with wind energy, with 24% being provided from a local DNO supply during periods of no generation. During periods of excess wind generation, the excess energy would be sold back to the energy supply company.

Rye Harbour – The Environment Agency

 

LHW Partnership was engaged to prepare a preliminary system design for a 25 kWp solar PV project. LHW undertook detailed system design and grid connection services. A site survey identified that the site had a split phase 20kVA transformer with a 10kVA feed going to the campus and discussions with the local DNO (UKPN) established that upgrading to a 3 phase supply was uneconomical.

 

Export constraint modelling was undertaken and a 10 kVA export limited system was agreed upon. The system will generate 90% of non-constrained output and in anticipation of the future adoption of energy storage, the technology selected facilitates developments for the 100% use of generated power. 

Anglian Water Group - Savills (UK) Ltd.

 

LHW Partnership was instructed by Savills (UK) Ltd. to undertake export constraint modelling for eight sites under Anglian Water Group ownership. The sites were identified as being suitable for grid connected solar PV systems however grid connection applications made to the local DNOs returned high connection costs making the advancement of the projects uneconomical. 

 

As part of the assessment the annual half-hourly import data was modelled against the site specific predicted generation profile and the results indicated that with the integration of export limiting technology the development of the projects would be feasible with larger PV Systems than initially anticipated.

Free Hold – Northamptonshire

 

LHW Partnership was engaged to design a system to maximize system yields, allowing for export constraints set by the local DNO. Due to the abundance of ground space a single axis tracker system incorporating module optimsier technology was chosen to maximise the module yields.

 

The system comprised 250 kWp solar PV modules arranged in 2 x 270 Wp module layout per tracker, with each module pair connected to an optimiser. The module mismatch losses over the project life will be minimised, further increasing the yield. After 12 months of operation the system is delivering nearly 1300 kWh/kWp which is circa 30% above an equivalent fixed axis system. The additional yields are realised during early mornings and afternoons.

London Southend Airport – Stobart Group

 

LHW Partnership LLP was instructed by Syzygy Renewables Ltd. on behalf of the Stobart Group to undertake export constraint modelling for a solar PV development at London Southend Airport

 

The development had secured grid connection with the local DNO however the connection agreement was subject to a limited export capacity of 200 kVA. LHW undertook a Yieldworks analysis and by assessing site's half-hourly demand profile, generation profile, export constraint and load variance, the optimal system size was found to be 2500 kWp. 

International Freight/Logistics Group - Tor Power

 

LHW Partnership LLP was instructed by Tor Power Ltd, on behalf of a major International Logistics company to undertake export constraint modelling for a solar PV development on a portfolio of commercial and warehouse units around the UK.

 

The sites were constrained by limited export gird capacity and modelling was undertaken to optimise the PV size given the roof capacity. The potential for PV far exceeded the realistic potential as warehousing is not a large power consumer, and DNO constraints were a particular limitation.

Essex & Suffolk Water Ltd - Savills (UK) Ltd.

 

LHW Partnership was instructed by Savills (UK) Ltd. to undertake export constraint modelling for a number of sites under owned by Essex & Suffolk Water. The sites were identified as being suitable for grid connected solar PV systems however grid connection applications made to the local DNOs returned high connection costs making the advancement of the projects uneconomical. 

 

As part of the assessment the annual half-hourly import data was modelled against the site specific predicted generation profile and the results indicated that with the integration of export limiting technology the development of the projects would be feasible with larger PV Systems than initially anticipated.

Domestic Property, Buckinghamshire

 

LHW Partnership was instructed by a private customer to undertake Yieldworks modelling of a domestic solar PV system to assess the viability of implementing a battery storage system. The solar PV system’s maximum output is during the day when on-site demand is low. As battery storage technology advances, costs decrease and the economic viability of the integration of barriers and solar PV systems improve.

 

As part of the assessment a baseload of 250 W was assumed and the estimated half-hourly demand data was modelled against the site specific predicted generation profile. The results indicated that through the incorporation of battery storage, the export of excess energy can be offset to charge the batteries during periods of low demand, allowing the stored energy to be consumed in the evenings, when the solar PV system is not operational. 

Off-Grid Property, Gloucestershire

 

LHW Partnership was instructed by a private customer to undertake system modelling for an off-grid domestic customer. The assessment incorporated the estimated the property’s seasonal demand profile in order to appropriately size a solar PV system with a battery storage system.

 

The average daily demand was estimated to be 3.6 kWh and the simulation found that the optimal system size would be a 1.6 kWp solar PV system with a Lithium-ion battery pack. The modules are to be angled at 60 degrees to maximise winter generation and surplus demand requirements during low generation periods will be met by a 5.2 kW back-up diesel generator.

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