Energy storage system integration and control
A fully-instrumented, programmable high-power (200 kW 240 kVA 180 kWh) AC grid connected energy storage system linked into the campus low voltage system enables control algorithms for grid services to be examined. It also monitors the impact that these will have on the energy storage assets and the associated control and management systems. Alternative or hybrid energy storage elements can be connected to the energy storage system to assess their impact on the power network. The AC grid energy storage system can also be interfaced with the real-time hardware-in-the-loop power network simulator to enable local distribution network and wider power network studies to be undertaken.
100kW Test Bed
The Intelligent Electric Power Network Evaluation Facility (IEPNEF) is a state-of-the-art 100 kW DC aircraft-electrical systems demonstrator test rig. IEPNEF forms part of the Rolls-Royce University Technology Centre in Electrical Systems, and was funded by Rolls-Royce through the Systems Engineering for Autonomous Systems (SEAS) Defence Technology Centre (DTC) which was established by the UK Ministry of Defence and is central to their intelligent integrated energy management strategic priority.
IEPNEF comprises a real-time engine model that commands two electric drive engine shaft emulators (low and high pressure), which drive shaft-mounted generators having a combined capacity of 100 kW. A reconfigurable, 540 V, DC network routes the generator outputs to a suite of 30 kW bi-directional programmable load emulators and a programmable 1 MJ energy storage device. The entire system may be commanded from a real-time control system, enabling the emulation of complete flight profiles.
Hardware In The Loop
Essential for equipment intended for use in the energy system is the ability to carry out closed loop testing of hardware and control strategies – especially when there are dynamic characteristics in the systems being tested.
The hardware in the loop test facility allows hardware to be tested in a realistic manner by connecting actual storage, control and protection equipment in a closed loop with the simulator in the same manner that they are connected to the real power system. A variety of operating scenarios including fault, load rejection and islanded operation can be simulated in order to study the performance of this hardware under varying normal and abnormal operating conditions.
The Real Time Digital Simulator in Manchester allows us to run detailed switching models of power converters and integrated models of distribution and transmission networks with hundreds of three-phase buses (even if simplified representations are used) to fully explore the optimal integration and coordination of energy storage systems.
Lifetime Management & Converter Test
A common sensitivity to all users is battery life-time and device performance. Better management of battery-based energy storage modules, and other non-battery energy storage systems, will extend module performance, and lifetime, offering a better financial return to the user / system operator.
State-of-the-art energy storage device test facilities have recently been installed, enabling the comprehensive testing of battery cells, modules, or the full energy storage system, including the power electronics, with realistic operating duties under a wide range of environmental conditions and over many operational cycles. The energy storage equipment is funded through the EPSRC initiative on capital equipment for grid scale energy storage, and forms part of the government’s strategic investment in the ‘great technologies’ that have the potential to provide a foundation for future growth and prosperity.
For more information on the facilities please visit the University of Manchester Energy Storage research web page.