Event Identification and Contingency Assessment for Voltage Stability via PMU

The operating state of power system changes dynamically due to severe change in system conditions such generation, load or line trip. Such severe disturbances effect voltage phasor, current phasor and system frequency. So, to better monitor the dynamics of large power system, wide area synchronized monitoring of voltage phasor, current phasor and system frequency is vital. For efficient real time monitoring and operation of power system, high resolution based phasor measurement units (PMUs) should be used. PMU can accurately measure node and branch phasors at high sampling rate. In this paper, application of PMUs to monitor power quality and voltage instability due to contingency is shown. The paper proposes a novel approach for contingency filtering and assessment in sense of power quality and voltage instability. The approach consists of two-block technique: first block filters out dangerous contingency; then second block assesses it for severity based upon performance index. Another application is to understand system dynamics during different kinds of disturbance such as generator trip or load rejection. To realize this logic-based approach is used for analysis. This will help the operator in real time analysis of system as a whole and in deciding the nature and location of disturbance. Overall, it will help to detect emergency condition and take necessary control action in real time. The ideas of this paper will be illustrated using IEEE 39 bus power system.

[1]  C.D. Vournas,et al.  Induction Machine Short-term Voltage Stability and Protection Measures , 2006, 2006 IEEE PES Power Systems Conference and Exposition.

[2]  Bala Venkatesh,et al.  Optimal reactive power planning against voltage collapse using the successive multiobjective fuzzy LP technique , 1999 .

[3]  V. Vittal,et al.  Online Risk-Based Security Assessment , 2002, IEEE Power Engineering Review.

[4]  C.W. Taylor,et al.  A survey of current practices for transient voltage dip/sag criteria related to power system stability , 2004, IEEE PES Power Systems Conference and Exposition, 2004..

[5]  P. Kundur,et al.  Definition and classification of power system stability IEEE/CIGRE joint task force on stability terms and definitions , 2004, IEEE Transactions on Power Systems.

[6]  Arun G. Phadke,et al.  Boosting immunity to blackouts , 2003 .

[7]  C.W. Taylor,et al.  Understanding and solving short-term voltage stability problems , 2002, IEEE Power Engineering Society Summer Meeting,.

[8]  G.T. Heydt,et al.  A power quality index based on equipment sensitivity, cost, and network vulnerability , 2004, IEEE Transactions on Power Delivery.

[9]  G. Trudel,et al.  Wide-area monitoring and control at Hydro-Quebec: past, present and future , 2006, 2006 IEEE Power Engineering Society General Meeting.

[10]  A.G. Phadke,et al.  An Alternative for Including Phasor Measurements in State Estimators , 2006, IEEE Transactions on Power Systems.

[11]  Venkataramana Ajjarapu,et al.  Identification of voltage collapse through direct equilibrium tracing , 2000 .

[12]  Nima Amjady.  Dynamic voltage security assessment by a neural network based method , 2003 .

[13]  James S. Thorp,et al.  An importance sampling application: 179 bus WSCC system under voltage based hidden failures and relay misoperations , 1998, Proceedings of the Thirty-First Hawaii International Conference on System Sciences.

[14]  J. Eto,et al.  Understanding the cost of power interruptions to U.S. electricity consumers , 2004 .

[15]  Peter W. Sauer,et al.  Power System Dynamics and Stability , 1997 .

[16]  J. W. Shaffer,et al.  Air conditioner response to transmission faults , 1997 .

[17]  V. Stewart,et al.  Modeling of stalled motor loads for power system short-term voltage stability analysis , 2005, IEEE Power Engineering Society General Meeting, 2005.

[18]  P. Kundur,et al.  Power system stability and control , 1994 .

[19]  Laxmi Srivastava,et al.  Fast voltage contingency screening using radial basis function neural network , 2003 .

[20]  V. Ajjarapu,et al.  Contingency assessment for voltage dip and short term voltage stability analysis , 2007, 2007 iREP Symposium - Bulk Power System Dynamics and Control - VII. Revitalizing Operational Reliability.