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Miao Z.,University of South Florida | Fan L.,University of South Florida | Osborn D.,Midwest ISO | Yuvarajan S.,North Dakota State University
IEEE Transactions on Energy Conversion | Year: 2010

This paper develops a coordination control strategy for wind farms with line commutated converter-based HVdc delivery for participating in inertial response and primary frequency control. The coordination philosophy is to feedback the grid frequency and its derivative and adjust the delivery power of the HVdc link according to the feedback signals. The feedback loop employing the derivative of the grid frequency aims to improve the inertial response while the feedback loop employing the grid frequency deviation introduces a droop at the rectifier control loop. When the grid frequency is too high or too low, active power flow through the HVdc link will be ramped down or up. In turn, the wind generation will increase or decrease the blade angles to reduce or increase the captured wind power through pitch control. A case study demonstrates the effectiveness of the inertial enhancement and frequency droop in HVdc control. Simulation results in transient security assessment tool are given. © 2006 IEEE. Source


Lin Z.,Zhejiang University | Lin Z.,University of Tennessee at Knoxville | Xia T.,Dominion | Ye Y.,University of Tennessee at Knoxville | And 6 more authors.
IEEE Transactions on Power Systems | Year: 2013

A fast islanding detection tool can help power dispatchers monitor and control power system operations. Frequency monitoring network (FNET) is a low cost and quickly deployable wide-area phasor measurement system at the distribution system level. The frequency disturbance recorder (FDR) in FNET is actually a single-phase phasor measurement unit (PMU) installed at ordinary 120 V outlets in the sense that it measures the voltage phase angle, amplitude, and frequency from a single-phase voltage source. Based on the data collected by the FDRs deployed in the North American power grid, two islanding detection methods, the frequency difference method and the change of angle difference method, are proposed. The nine real cases recorded, including islanding cases, generation trip cases, load shedding cases and oscillation cases, are presented to verify the proposed methods of islanding detection. Sensitivity analysis on the thresholds of the frequency deviation and angle deviation is done based on the real measurement data for obtaining the insensitive interval of two thresholds. The results show that the proposed methods can correctly detect power system islanding, and will not be falsely triggered by generation trips, load shedding and system oscillations. © 2013 IEEE. Source


Mishra S.,Indian Institute of Technology Delhi | Mishra Y.,Midwest ISO | Vignesh S.,Indian Institute of Technology Delhi
IEEE Power and Energy Society General Meeting | Year: 2011

The available wind power is stochastic and requires appropriate tools in the OPF model for economic and reliable power system operation. This paper exhibit the OPF formulation with factors involved in the intermittency of wind power. Weibull distribution is adopted to find the stochastic wind speed and power distribution. The reserve requirement is evaluated based on the wind distribution and risk of under/over estimation of the wind power. In addition, the Wind Energy Conversion System (WECS) is represented by Doubly Fed Induction Generator (DFIG) based wind farms. The reactive power capability for DFIG based wind farm is also analyzed. The study is performed on IEEE-30 bus system with wind farm located at different buses and with different wind profiles. Also the reactive power capacity to be installed in the wind farm to maintain a satisfactory voltage profile under the various wind flow scenario is demonstrated. © 2011 IEEE. Source


Osborn D.,Midwest ISO
IEEE Power and Energy Society General Meeting | Year: 2011

HVDC transmission has characteristics that may be able to enhance the reliability and economic performance of the interconnected AC system. One characteristic of HVDC is that the schedules may be programmed. A second significant characteristic is that the speed of response over a long distance (500+ miles) is in the range of a few cycles. Two applications that might use the HVDC characteristics are frequency control and integrating wind generation. Overly simple economic examples of the two applications are discussed © 2011 IEEE. Source


Navid N.,Midwest ISO
2012 IEEE PES Innovative Smart Grid Technologies, ISGT 2012 | Year: 2012

The current trends encourage the expansion of demand response in power system operation. Although operational strategies for various demand response classes (industrial, commercial and residential) are different, a set of common opportunities and challenges face the integration of demand response resources into energy market and operating reserve mechanisms. © 2012 IEEE. Source

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