BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Asia/Calcutta BEGIN:STANDARD DTSTART:19451014T230000 TZOFFSETFROM:+0630 TZOFFSETTO:+0530 TZNAME:IST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20140311T104321Z UID:F09D8FDF-E5B6-11E7-833E-0050568D7F66 DTSTART;TZID=Asia/Calcutta:20140310T170000 DTEND;TZID=Asia/Calcutta:20140310T180000 DESCRIPTION:With growing complexity of power grid interconnections\, power systems may become increasingly vulnerable to low frequency oscillations ( especially inter-area oscillations) and dependent on stabilizing controls to provide adequate damping. Although local measurements have conventional ly been utilized as a control input for stabilizing controls\, the damping effect of local signal based controls is limited because local measuremen ts have limited modal observability. In such situations\, the use of wide- area signals in which the desired oscillation may be readily observable co uld be essential in damping inter-area oscillations of a large interconnec ted system. Incidentally\, the ability and potential to use wide-area sign als for control purposes has increased since a significant investment has been made in the U. S. in deploying synchrophasor measurement technology. Fast and reliable communication systems are essential to enable the use of wide-area signals in controls. If wide-area signals find increased applic ability in controls the security and reliability of power systems could be vulnerable to disruptions in communication systems. Even though numerous modern techniques have been developed to lower the probability of communic ation errors\, communication networks cannot be designed to be always reli able. Given this background the motivation of this work is to build resili ency in the power grid controls to respond to failures in the communicatio n network when wide area control signals are used. In the proposed work\, two approaches\, 1) building resiliency in the physical system and 2) buil ding resiliency in the cyber system are presented respectively to countera ct communication failures. The approach to the solution in both methods is motivated by considering the use of a robustly designed supplementary dam ping control (SDC) framework associated with a static VAr compensator (SVC ). When there is no communication failure\, the designed controller guaran tees enhanced improvement in damping performance. When the wide-area signa l in use is lost due to a communication failure\, however\, the resilient control provides the required damping of the inter-area oscillations by ei ther utilizing another wide-area measurement through a healthy communicati on route or by simply utilizing an appr opriate local control signal. With the proposed control included\, the system is stabilized regardless of co mmunication failures\, and thus the reliability and sustainability of powe r systems is improved. The proposed approaches can be extended without los s of generality to the design of any resilient controller in power systems . In this work the approach is designed and demonstrated on a specific con troller. In addition to improving the control resiliency in response to co mmunication failures\, this work also presents the work of adding robustne ss to counteract the impact of uncertainties including variation of system operating conditions and transmission delays. Linear fractional transform ation is utilized to model the uncertainties and a synthesis framework is proposed to design an optimal controller robust to the considered uncertai nties. Small signal stability analysis and nonlinear time domain simulatio ns are employed to evaluate the proposed approaches. The results obtained have demonstrated that the designed controllers indeed improve system stab ility and wide-area grid resiliency in response to communication failures and delay uncertainty.\n\nKanpur\, Uttar Pradesh\, India LOCATION:Kanpur\, Uttar Pradesh\, India ORGANIZER:saikatc@iitk.ac.in SEQUENCE:0 SUMMARY:[Legacy Report] IEEE UP lecture on "Improved grid resiliency throug h interactive system control" URL;VALUE=URI:https://events.vtools.ieee.org/m/101655 X-ALT-DESC:Description: <br />With growing complexity of power grid interco nnections\, power systems may become increasingly vulnerable to low freque ncy oscillations (especially inter-area oscillations) and dependent on sta bilizing controls to provide adequate damping. Although local measurements have conventionally been utilized as a control input for stabilizing cont rols\, the damping effect of local signal based controls is limited becaus e local measurements have limited modal observability. In such situations\ , the use of wide-area signals in which the desired oscillation may be rea dily observable could be essential in damping inter-area oscillations of a large interconnected system. Incidentally\, the ability and potential to use wide-area signals for control purposes has increased since a significa nt investment has been made in the U. S. in deploying synchrophasor measur ement technology.\nFast and reliable communication systems are essential t o enable the use of wide-area signals in controls. If wide-area signals fi nd increased applicability in controls the security and reliability of pow er systems could be vulnerable to disruptions in communication systems. Ev en though numerous modern techniques have been developed to lower the prob ability of communication errors\, communication networks cannot be designe d to be always reliable.\nGiven this background the motivation of this wor k is to build resiliency in the power grid controls to respond to failures in the communication network when wide area control signals are used. In the proposed work\, two approaches\, 1) building resiliency in the physica l system and 2) building resiliency in the cyber system are presented resp ectively to counteract communication failures. The approach to the solutio n in both methods is motivated by considering the use of a robustly design ed supplementary damping control (SDC) framework associated with a static VAr compensator (SVC). When there is no communication failure\, the design ed controller guarantees enhanced improvement in damping performance. When the wide-area signal in use is lost due to a communication failure\, howe ver\, the resilient control provides the required damping of the inter-are a oscillations by either utilizing another wide-area measurement through a healthy communication route or by simply utilizing an appr\n opriate\n lo cal control signal. With the proposed control included\, the system is sta bilized regardless of communication failures\, and thus the reliability an d sustainability of power systems is improved. The proposed approaches can be extended without loss of generality to the design of any resilient con troller in power systems. In this work the approach is designed and demon strated on a specific controller.\nIn addition to improving the control re siliency in response to communication failures\, this work also presents t he work of adding robustness to counteract the impact of uncertainties inc luding variation of system operating conditions and transmission delays. L inear fractional transformation is utilized to model the uncertainties and a synthesis framework is proposed to design an optimal controller robust to the considered uncertainties. \nSmall signal stability analysis and non linear time domain simulations are employed to evaluate the proposed appro aches. The results obtained have demonstrated that the designed controller s indeed improve system stability and wide-area grid resiliency in respons e to communication failures and delay uncertainty. END:VEVENT END:VCALENDAR