Grid-connected battery energy storage systems with fast acting control are a key technology for improving power network stability and increasing the penetration of renewable generation.This paper describes two research facilities connected to UK electricity grid.Their performance is detailed, along hardware results, number grid support services demonstrated, again results presented.The facility operated by The University Manchester rated at 236kVA, 180kWh, 400V campus network, Sheffield...

Traditional valve-controlled hydraulic cylinders are usually very inefficient due to power loss through the control valve. An efficient alternative architecture is distribute electrically rather than hydraulically a group of and drive each cylinder via individual servomotor-driven pumps. This arrangement called electrohydrostatic actuation. Such actuators currently available for ratings several hundred watts or greater, but not in sub-100 W range. paper details design, simulation testing...

Modern aircraft require a robust and reliable supply of electrical power to drive growing number high-power loads. Generators are driven by mechanical offtake from the variable speed gas turbine (GT), while constant frequency ac network is preferred. Here, doubly fed induction machines advantageous since they can be controlled, through fractionally rated converter, decouple speed, making control possible. However, converter must suitably rated, according range, voltage regulation,...

MVDC systems have attracted a lot attention for the integration of renewable energy and electrification transport due to their superior system operational performance high power quality. DC circuit breakers are significant importance development because they offer fast protection from fault conditions compared mechanical equivalent. However, unlike AC systems, there is no zero-crossing current in this makes design more demanding. This paper presents solid-state breaker (SSCB) details using...

This paper investigates the development and implementation of a real-time thermal ageing model for polymer-based electrical wire insulation using classical Arrhenius relationship chemical reaction rates. The presents theoretical method predicting lifetime based on temperature measurements fibre-optic sensors embedded inside copper-wound coils. performance presented in delivering consistent results winding predictions is then assessed validated steady-state transient experiments wound test...

The supply of electrical power is usually achieved by a generator driven from prime mover some form mechanical drivetrain. Such an electromechanical system will have natural resonant modes in both the and subsystems. provides coupling between subsystems, transferring not only useful power, but also disturbances domains. These may excite resonances resulting cross-domain (electromechanical) interaction. This can lead to lifetime reduction components instability network, poor reliability for...

This paper details the design, construction, and testing of a MOSFET based solid-state power controller rated at 270V, 200A, equivalent to 54kW, with an overload capability 400A. The switch is parallel array 21 fractionally Si devices which current share achieve overall rating while minimising on-state losses. A transient voltage suppressor used dissipate inductive energy protect switching devices. Results analysing onstate losses, thermal performance, inrush limiting, load breaking,...

There is a strong interest in the development of high-temperature electrical machines, both from academic research and industrial consumers. Conventional machines cannot operate much beyond 250° C, this limits their application certain sectors such as oil, gas, aerospace. The key technology for operation wire insulation systems motor windings. This study presents an experimental on temperature dependence resistance standard Class H (180°C) enamel wire, MAGNETEMP CA-200 photonis glass-coated...

A power hardware-in-the-loop (PHIL) facility for grid-linked energy storage is evaluated in this research terms of communication latency, and system model performance. The PHIL consists a 240 kVA 180 kWh Siemens SieStorage battery (BESS), which via dSPACE real-time platform interfaced using TCP/UDP Ethernet to digital simulator (RTDS). latency has been monitored at the RTDS side, ramp signal used loop-back test average was only 2.32 ms, 99.8% transitions analysed had 2 or 3 ms latency. then...

Modern aircraft require a robust and reliable supply of electrical power to drive growing number high loads. Generators are driven by mechanical offtake from the variable speed gas turbine, while constant frequency AC network is preferred. Here doubly-fed induction machines advantageous since they can be controlled, through fractionally rated converter, decouple speed, making control possible. However, converter must suitably rated, according range, voltage regulation, requirements. This...

The purpose of this study was to investigate the effects prolonged high-intensity running on impact accelerations in trained runners. Thirteen male distance runners completed two 20-minute treadmill runs at speeds corresponding 95% onset blood lactate accumulation. Leg and head were collected for 20 s every fourth minute. Rating perceived exertion (RPE) scores recorded during third last minute each run. RPE responses increased (P < .001) from start (11.8 ± 0.9, moderate intensity) first run...

The supply of electrical power requires a generator, which must be driven from prime mover, by some form mechanical drivetrain. Such an electro-mechanical system will have natural resonant modes in both the and subsystems. These subsystems are interfaced through generator for useful transfer power, but may also couple unwanted disturbances between domains resulting interaction. interaction can lead to lifetime reduction components instability network, poor reliability wider system....

The paper summarises the conclusions of a study into single-phase, small-scale semi-autonomous networks, such as might be formed by single-household (a domestic MicroGrid). Suitable technologies are discussed and sample results from hardware model presented. A novel solution for low-cost integration system well-behaved aggregate is described.

Commanding multiple energy storage systems (ESSs) to provide grid balancing services is a popular approach manage the finite state-of-charge (SoC) of each asset. The communication between individual assets can be challenge due their distribution throughout land-based power network. Two battery-based ESS, 240 kW 180 kWh lithium ion polymer (nickel manganese cobalt oxide (NMC)) based system located behind-the-meter on 400 V network, and 2 MW 1 MWh lithium-titanate system, which at an 11 kV...

A design methodology for high performance electric vehicle power electronics is presented in this paper. conventional state-of-the-art inverter designed using standard techniques that uses commercially available off the shelf parts and a small number of conventionally manufacturable mechanical analysed. The apparent benefits converter are shown to be difficult translate vehicle-level due integration overheads.A figure merit approach include key parameters such as weight, cost, thermal...