AVOID EXPORT FINES MICROTURBINE GAS CASE STORY
CO2 & COST REDUCTIONS Export limiting systems performing optimally Pure World Energy has been operating since 2013 and has built up a strong, competitive business offering clients key savings on their energy costs by utilising advanced technology to reduce, produce and manage the energy consumed. The UK National Grid infrastructure was originally designed to transfer the power generation by large regional power stations and distribute that power to the consumers spread around the network. In recent years, there has been a drive by larger energy consumers to reduce costs by generating their own electrical power on site. Regional network operators have required that these distributed generating plants be approved for their connection to the national grid and will also determine if the site is permitted to export any excess electrical power. If power export is permitted then this may be limited to a maximum value or the exporting of electrical power may be forbidden. Exceeding export limits often results in significant fines from the local network operator. DEIF has cooperated with Pure World Energy for several years providing solutions for their gas micro-turbine combined Heat and Power (CHP) installations and opportunities in a range of sites including leisure & fitness centres, hotels, educational faculties and hospitals.
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»We partnered with DEIF (UK) Ltd because of their extensive technical experience and proven expertise in delivering safe and reliable energy control systems bespoke to our customer’s needs.« Sean Fitzpatrick
CEO at Pure World Energy
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CONFIGURABLE MEASURING VALUES CEO at PWE, Sean Fitzpatrick, says: “We partnered with DEIF (UK) Ltd because of their extensive technical experience and proven expertise in delivering safe and reliable energy control systems bespoke to our customer’s needs. The support we receive from the team and their commitment to continually improve performance and efficiency of the technologies provided will help us maintain and achieve many more successful installations.” Faced with the technical aspects involved in both complying with the grid connection requirements and providing an effective Export Limiting System, DEIF was asked to suggest an appropriate solution based on our technical expertise, extensive product range and power systems control experience.
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DEIF has provided a solution for export limiting control based on the TAS-331DG – a micro-controller-based, powerful, fast and compact unit that measures the power being drawn from the grid and provides a proportional direct current signal to the installed CHP units. TAS transducers can be delivered pre-configured to set measuring values and ranges or un-configured for customer configuration using DEIF’s free PC tool. PC configuration makes free adjustment of the full input and output ranges possible without requiring any mechanical adjustments inside the transducer. The TAS-331DG can either be configured as a standard linear transducer or with up to 3 slopes for enhanced resolution in one or two critical ranges of the measurement.
OPTIMAL PERFORMANCE The overall control system lets the CHP unit operate within its optimum efficiency range while controlling the output to cope with the demand fluctuations of the entire site. The Waterside Hotel & Leisure Club has benefitted from annual financial savings of 7.5%, with approximately 58% of their electricity and 59% of their heat taken off-grid. In addition, they also achieve a reduction in CO2 emissions of up to 295 metric tonnes a year.
Since the transducers have no mechanical parts (similar to potentiometers), the calibration stability is excellent once the configuration has been set. The Waterside Hotel & Leisure Club is just one of Pure World Energy’s installations where the TAS-331DG solution for export limiting is operating extremely successfully. Located in the heart of Didsbury, Manchester, the hotel offers 45 newly refurbished rooms plus a modern leisure facility boasting a 25m swimming pool, spa and a 130 station gym.
Operations Manager at PWE, Mark Doyle, commented, “In terms of the operation and performance of the Capstone C65 MicroTurbine© CHP unit, the TAS transducer has been instrumental in ensuring the unit is performing at optimal capacity, without exceeding export restrictions. This provides PWE with greater control, allowing us to provide a more efficient service to our customer.”
Installed at the site, the Capstone C65 MicroTurbine© combined heat and power (CHP) unit provides both heat and electrical power to the site. A total of 1,050,000 kWh of energy is produced annually, with 370,000 kWe of that being electricity generation and 680,000 kWth being heat generation. The dynamic nature of the electrical and heating demand of the hotel and leisure club requires the CHP unit to react quickly to these changing conditions.
»The Waterside Hotel & Leisure Club has benefitted from annual financial savings of 7.5% on top of reducing CO2 emissions by up to 295 metric tonnes a year.« Sean Fitzpatrick, CEO Pure World Energy
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Selectable AC-Transducer, TAS-331DG Measuring transducers for power or reactive power
TAS-331DG features ► Measures power or reactive power on AC networks ► Class 0.5 measurement ► Supply and measuring voltage up to 690 V ► Pre-configuration or easy PC tool configuration ► Configurable up to three output slopes
Powerful, fast and compact, the units in DEIF’s transducer range measure sinusoidal alternating voltage and/or current signal and provide output signal as direct current or voltage signal proportional to measurements for PLCs, PCs, microprocessor control, indicators, alarm units etc. TAS transducers are micro-controller-based with one analogue output for measurement of power, voltage, current etc. on an AC network. Because these transducers have no mechanical parts like potentiometers, the calibration stability is excellent. TAS transducers can be delivered pre-configured to set measuring values and ranges or un-configured for customer configuration using DEIF’s free PC tool.
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Diagram and technical description Pure World Energy solution
TAS-331DG
CHP
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Po o
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Main grid
t gh Li
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Heat
Power
Facts about the Capstone CHP gas microturbine Engine make
CAPSTONE
Voltage
400/480 VAC
Engine type
Combined heat & power gas microturbine
Electrical service
3-phase, 4-wire wye
Power output
60kW
Frequency
50/60 Hz
DEIF’s power management solution fits gas engines from for instance the following manufacturers ► MAN
► CATERPILLAR
► JENBACHER
► GUASCOR
► MWM
If your gas engine is from another manufacturer please contact us at info@deif.com
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► CAPSTONE
DEIF A/S Frisenborgvej 33, 7800 Skive, Denmark Tel. +45 9614 9614 LEARN MORE AT DEIF.COM