Powerstar Virtue Brochure British Chambers of Commerce www.powerstar.com
INTEGRATING ENERGY STORAGE WITH RENEWABLE ENERGY Power generators like power plants and wind farms make energy which is then passed to the national grid or power network. The grid transmits this through pylons before it reaches an electricity company, who divert power into buildings. If there is a surge in demand for electricity this extra power has to be found by the national grid. Demand for electricity is increasing; globally, consumption of electricity is expected to grow by over 60% by 2030. Powerstar Virtue allows companies to save and store electricity locally and switch to this stored supply at any time. On-site renewables can be integrated with the Powerstar Virtue solution to provide the maximum cost benefit from renewable generation, this includes: Eliminating the need for inverters on renewable installations Reducing the cost of initial renewable installation Increasing return on investment levels of renewable installations Storing energy generated by on-site renewable technologies UNIQUE VOLTAGE OPTIMISATION TECHNOLOGY Powerstar is the only voltage optimisation technology in the world with a patent on its design The Powerstar system matches the incoming electrical supply to the needs of the on-site equipment It achieves this by generating real negative power which flows towards the grid and is subtracted from the incoming power 70%-80% of the total savings from Powerstar come from the real negative power feedback 20%-30% come from the improvement of equipment efficiencies Consequently, by combining the unique design of Powerstar and renewable energy generation on a site, renewables can be made reliable and maximum cost benefits achieved. Powerstar Virtue is not limited to providing savings on sites with renewable installations, it is also capable of making significant cost savings for any commercial or industrial site which has a voltage optimisation installation. MAKING RENEWABLE ENERGY RELIABLE REDUCE Reduce electricity consumption through electronically regulated voltage optimisation technology from Powerstar STORE Harness induced negative power feedback to store electricity locally SAVE Switch to stored power at any time to significantly reduce electricity costs. Powerstar Virtue harnesses the induced negative power generated by the Powerstar voltage optimisation technology to charge a storage medium and integrates it with renewable generation (if available). This ensures that users will always have optimal power during times of need because the induced negative power generated by the Powerstar voltage optimisation technology is based on the load of a building. This load is easy to predict; induced negative power is usually 10% of the total load, therefore the current available for charging remains consistent. Energy grids around the world are struggling to cope with the surge in demand for electricity. The increase in demand requires more cabling and pylons to support usage, a cost which is ultimately passed onto electricity users bills. This, coupled with the volatile nature of renewable generation sources solar and wind for example generate little amounts of power if the sun doesn t shine or wind doesn t blow highlights the need for flexibility and greater control of electricity usage. Powerstar Virtue is a solution to address these problems, allowing energy generated during periods of low demand to be stored locally and used when required. By utilising the stored energy to disconnect from the grid companies can make renewable energy reliable as the batteries used will always have a certain amount of energy stored (above 40%) so that when supply from the grid is interrupted unexpectedly, the building can still be fully supported. Powerstar Virtue allows users to become a Virtual Power Station (VPS), reliably forecasting how much power will be available at all times. Therefore informed decisions can be made on when stored energy should be used, which will allow companies to reduce electricity costs by significant amounts. A report from the University of Warwick concluded: Powerstar voltage optimisation can lead to energy savings. The overall power consumption is reduced because the negative power is induced as feedback power to the source. Virtually, this power can be considered as power generated from the load side. Professor Jihong Wang THE UNIVERSITY OF WARWICK MAXIMISE BENEFITS OF RENEWABLE INSTALLATIONS 3
POWERSTAR VIRTUE HOW IT WORKS FEATURES AND BENEFITS The Powerstar Virtue system is fully designed and manufactured in the UK, utilising the unique Powerstar voltage optimisation technology along with bi-directional inverters to provide an innovative energy storage system for businesses. POWERSTAR MAX / HV MAX MASTER CONTROLLER FEATURES Can be used with existing renewable infrastructure Suitable for any commercial or industrial building where voltage optimisation is installed Universal design, suitable for use globally Durable design for most environments and climates Integrated data logging Outdoor enclosure Emergency power mode Full UPS site support capability up to 2 hours Fully electronically regulated voltage output Phase balancing Harmonic reduction Power factor improvement BENEFITS Maximise savings by storing electricity locally Reduce costs by coming off grid at times of high tariff Eliminate risk of network interruption Guarantee stable and reliable power at all times Make your facility grid independent at any time Integrate with onsite renewables to maximise cost benefits Eliminate use of inverters on renewables Reduce cost of renewable installations Reduce the need for diesel generators Become a Virtual Power Station (VPS) and participate in National Grid incentive schemes (STOR, EDR & FDR) Reduce maintenance costs of onsite electrical equipment 100% savings guarantee CONTROLLER STORAGE NEGATIVE POWER GRID SUPPLY EXISTING INVERTERS The supplied electricity flows into the Powerstar voltage optimisation transformer and is optimised before reaching the load The load controller will sense the amount of power being demanded by the facility The excess current not accepted during charging is siphoned into the master controller by the induced negative power feedback It communicates with the Powerstar system to not only charge the batteries efficiently, but ensure any excess current not accepted during charging is used to reduce (shave) the amount of current being drawn from the grid Renewable generation (shown by the yellow line) will be directed to the same master controller to either power the load directly or convert it to DC voltage in order to charge the batteries The master controller contains an inverter/charge controller that STORED ENERGY RENEWABLE ENERGY (Solar, Wind) controls the output of power to the storage medium The master controller can be manually set to discharge the storage medium and disconnect the grid supply at a predetermined time, in such as way as to have no effect on the load The master controller will communicate directly with the national grid and respond to any demands. This will ensure maximum cost benefit from DNO incentivised schemes The discharged energy will flow back into the master controller and be converted to AC, as well as smoothed to provide a stable flow of power to the Powerstar voltage optimisation system INVERTERS REMOVED STORAGE Diagram 1. Solar array with inverters, before the installation of Powerstar Virtue. Diagram 2. Solar array, after the installation of Powerstar Virtue. For existing solar arrays, Powerstar Virtue can be fitted utilising the existing inverters on site. For companies looking to install solar arrays in the future, Powerstar Virtue can remove the need to purchase solar inverters. 5
EFFECT OF POWERSTAR VIRTUE ON ELECTRICITY PROFILES The charts below are typical load profiles for a site. The green line indicates low tariff periods, the yellow line indicates medial tariff periods and the red line indicates high tariff periods. Commercial store load profile (HHD) with solar panels on a sunny day BEFORE POWERSTAR VIRTUE AFTER POWERSTAR VIRTUE POWERSTAR SPECIFICATIONS Powerstar Virtue is integrated with a Powerstar MAX or Powerstar HV MAX voltage optimisation system. The Powerstar MAX range of electronic-dynamic, variable voltage optimisation systems provide a stable voltage output by automatically adjusting and maintaining voltage at the optimum level. Store Load Solar Store Load Solar 120 100 NUMBER OF PHASES 3 FREQUENCY 50/60Hz kwh (HH) 80 60 RATING 50kVA - 3000kVA AMBIENT TEMP/ALTITUDE -10 C to + 40 C up to 1,000m above sea level conditions (outside these please contact us) 40 PRIMARY VOLTAGE 400V/480V nominal ENCLOSURE IP23 as standard 20 0 00:30:00 01:00:00 01:30:00 02:00:00 02:30:00 03:00:00 03:30:00 04:00:00 04:30:00 05:00:00 05:30:00 06:00:00 06:30:00 07:00:00 07:30:00 08:00:00 08:30:00 09:00:00 09:30:00 10:00:00 10:30:00 11:00:00 11:30:00 12:00:00 12:30:00 13:00:00 13:30:00 14:00:00 14:30:00 15:00:00 15:30:00 16:00:00 16:30:00 17:00:00 17:30:00 18:00:00 18:30:00 19:00:00 19:30:00 20:00:00 20:30:00 21:00:00 21:30:00 22:00:00 22:30:00 23:00:00 23:30:00 00:00:00 00:30:00 01:00:00 01:30:00 02:00:00 02:30:00 03:00:00 03:30:00 04:00:00 04:30:00 05:00:00 05:30:00 06:00:00 06:30:00 07:00:00 07:30:00 08:00:00 08:30:00 09:00:00 09:30:00 10:00:00 10:30:00 11:00:00 11:30:00 12:00:00 12:30:00 13:00:00 13:30:00 14:00:00 14:30:00 15:00:00 15:30:00 16:00:00 16:30:00 17:00:00 17:30:00 18:00:00 18:30:00 19:00:00 19:30:00 20:00:00 20:30:00 21:00:00 21:30:00 22:00:00 22:30:00 23:00:00 23:30:00 00:00:00 SECONDARY VOLTAGE Electronically regulated 380V/460V (Or user defined) EFFICIENCY 99.91% - 99.94% A typical load profile of a site fitted with 200kW solar panels on a sunny summers day. The direct effect of solar (purple line) on the load profile is quite substantial, reducing the stores overall consumption of electricity by 32.6%. However, the majority of this load reduction occurs during non - peak hours, with solar only reducing the load requirement of the store during peak tariff times by 18%. Time The graph shows the same site with Powerstar Virtue installed, utilising both negative power and solar power in such a way as to prevent the store ever demanding more than 100kWh per half hour of energy from the grid, as well as removing the site completely from grid power during peak Tariff. HHD profile of a commercial store load without on-site renewable generation BEFORE POWERSTAR VIRTUE AFTER POWERSTAR VIRTUE Time MAX FULL LOSSES MAX NO LOSSES 2780 watts (example 1500kVA) 490 watts (example 1500kVA) CORE MATERIAL WEIGHT Cold rolled Silicon steel Example 1500kVA - 1,200kgs Powerstar HV MAX provides a combined solution to two common problems, combining a super low-loss amorphous core HV/LV transformer with integrated variable voltage optimisation technology. The super-low loss amorphous core transformer used in Powerstar HV MAX will provide 3%-10% savings on traditional HV/LV transformers. NUMBER OF PHASES 3 FREQUENCY 50/60 Hz RATING 300kVA - 3000kVA AMBIENT TEMP/ALTITUDE -10 C to + 40 C up to 1,000m above sea level conditions (outside these please contact us) PRIMARY VOLTAGE 4.16kV - 38kV, 3-phase nominal ENCLOSED IP65 (ONAN) / IP23 Ventilated (Dry) A typical load profile for a site with no on-site renewable generation. The green shaded column represents the optimum time for the site to come off-grid to avoid highest costs and inconsistent supply. The same profile with Powerstar Virtue. The high peak tariff period has been completely avoided by powering the site entirely from the Powerstar Virtue storage medium. The rest of the load profile has remained unaltered. This is because the storage medium was charged using the induced negative power, not power from the grid. Therefore not only is the consumer saving money, but they are also directly reducing kwh usage, both for themselves and the grid. SECONDARY VOLTAGE MAX FULL LOSSES HV MAX NO LOSSES Electronically regulated 380V/460V (or user defined) 11,700 watts (1500 kva Dry) 700 watts (Example 1500 kva dry) EFFICIENCY 99.91% - 99.94% VECTOR GROUP CORE MATERIAL WEIGHT Dyn11 Amorphous Steel - super low loss Powerstar design Example 1500 kva - 7,500kgs ONAN / 5,300kgs Dry 7
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