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SUMMARY:Next-Generation Smart Grid: Completely Autonomous Power Systems (C
 APS) - Qing-Chang Zhong\, IET Fellow\, SMIEEE Chair in Control and Systems
  Engineering Dept. of Automatic Control and Systems Engineering The Univer
 sity of Sheffield
DTSTART:20130531T130000Z
DTEND:20130531T140000Z
UID:TALK44175@talks.cam.ac.uk
CONTACT:Dr Jason Z JIANG
DESCRIPTION:Power systems are going through a paradigm change from central
 ised generation\, to distributed generation\, and further to smart grid. A
  large number of renewable energy sources\, electric vehicles\, energy sto
 rage systems etc. are being connected to power systems. Moreover\, various
  loads/consumers are being required to take part in the regulation of powe
 r systems and to improve energy efficiency. These make it impossible to ma
 nage power systems in the way that has been (is being) done\, simply becau
 se of the huge number of players in the system. A power system will eventu
 ally need to be operated completely autonomously\, with minimum human inte
 rference. A significant advantage of this is that the communication and in
 formation layer of smart grid can be released from the low-level control\,
  which improves system reliability and performance. Because of the technol
 ogical advancements in control and power electronics\, this is now becomin
 g possible. \n\nIn this talk\, the framework of Completely Autonomous Powe
 r Systems (CAPS) is presented and a possible technical route to achieve th
 is is demonstrated. \n\nIt is well known that the generation in power syst
 ems nowadays is dominated by synchronous generators\, of which the inheren
 t synchronisation mechanism is the underlying principle that holds a power
  system together. It will be shown in this talk that inverters\, i.e.\, th
 e common device used to integrate renewable energy sources\, electric vehi
 cles\, energy storage systems etc. into power systems\, can be operated to
  mimic conventional synchronous generators to possess the same synchronisa
 tion mechanism. Such inverters are called synchronverters. Moreover\, the 
 synchronverter strategy can be applied to make controllable rectifiers beh
 ave like synchronous motors\, which means the majority loads in power syst
 ems can be controlled as synchronous machines. As a result\, the majority 
 of generators and loads in a power system will be governed by the same syn
 chronisation mechanism and all will be able to work together autonomously 
 as equal partners to maintain system stability. Furthermore\, it will be s
 hown that the dedicated synchronisation unit in a synchronverter can be re
 moved without losing the vital synchronisation mechanism. Finally\, it wil
 l be shown that the widely-adopted phase-locked loops for grid connection 
 of inverters are intrinsically the same as the droop control strategy\, wh
 ich is fundamental to the operation of synchronous generators and inverter
 s. This provides the theoretical explanation why the dedicated synchronisa
 tion unit can be removed. The talk will be closed via pointing out the pre
 senter's view that one of the next battlefields for power electronics is i
 n power systems\, large or small\, where the integration of control and po
 wer electronics will be vital.\n
LOCATION:Cambridge University Engineering Department\, LR3B
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