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Suphot Jitlikhit Head in, Power System Analysis Section 1 Control & Protection Division Electricity Generating Authority of Thailand December 8, 2010 EGAT,

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Presentation on theme: "Suphot Jitlikhit Head in, Power System Analysis Section 1 Control & Protection Division Electricity Generating Authority of Thailand December 8, 2010 EGAT,"— Presentation transcript:

1 Suphot Jitlikhit Head in, Power System Analysis Section 1 Control & Protection Division Electricity Generating Authority of Thailand December 8, 2010 EGAT, Thailand Application of Phasor Measurement Units and Wide Area Monitoring System of EGAT’s Network and Trend for Smart Grid Smart Grid and Diagnostics

2 2 Contents WAMS & PMU history in EGAT’s network Phasor vs. SCADA Comparison SCADA vs. PMU Measurement Example for Real time Application Benefits of using PMU in EGAT &Trend to Smart Grid Conclusion WAMS & PMU

3 3 Wide Area Monitoring (WAMS) : use GPS Satellite Wide Area Monitoring System use a GPS satellite signal to time-synchronize from phasor measurement units (PMUs) at important nodes in the power system, send real-time phasor (angle and magnitude) data to a Control Centre. The acquired phasor data provides dynamic information on power systems, which helps operators to initiate corrective actions to enhance the power system reliability. GPS satellite PMU WAMS & PMU

4 4 Installation of PMUs at critical nodes in Power Systems. GPS synchronized current and voltage phasor measurement. Time resolution: < 10 – 6 s Measurement quality: 0.1% of U and I and Angle accuracy of < +/- 0.05% Wide Area Monitoring (WAMS) : System Configuration High precision data acquisition WAMS & PMU

5 5 Wide Area Monitoring (WAMS) : Project in 2005 EGAT installation Wide Area Monitoring (WAMS) Inter-area oscillation on the tie transmission line between the Central system and the Southern system is one of the important problems which lead to reduce stability and security of the transmission system. To prevent system from inter-area oscillation, Wide Area Monitoring System (WAMS) was installed at the Central system and the Southern system in 2005 to monitor the stability of this power transmission network. WAMS & PMU Bottleneck in transmission corridor: Limit due to concerns about power oscillation, the origin, amplitude, frequency, usual duration and damping of oscillation are not know

6 6 Wide Area Monitoring (WAMS) : Power Oscillation Monitoring Bang Saphan Central-South power corridor Surat Thani WAMS & PMU

7 7 Wide Area Monitoring (WAMS) : PMU Installation EGAT installation Wide Area Monitoring (WAMS) Phasors Monitoring Units (PMUs) are installed at Bang Saphan and Surathani Substation and use a GPS satellite signal to time- synchronize voltage and current readings as they are taken from both substations. Data can be streamed into a Control Center from far-flung points in the grid, where it is evaluated to give grid operators a precise picture of what is happening in their system, online. They can also finally see what is happening beyond their own control area – an advance over traditional monitoring and protection methods. WAMS & PMU WAMS Benefit: Detect of oscillation, Assessment of power system damping, Oscillation Monitoring, Increase power transfer at defined security, and Early warning to avoid power system collapse.

8 8 Wide Area Monitoring (WAMS) : Schematic Diagram WAMS & PMU

9 9 The project has upgraded from the existing of Digital Fault Recorder (DFR), totally 6 sites and 14 PMUs installed. This is as the pilot project to test the function of PMU on DFR platform. Phasor Data Concentrator (PDC) and its software application has been installed in the server and its display available at the operator console for visualization. This project has only used for monitoring purpose and observe the system in broader scale.. Wide Area Monitoring (WAMS) : Project in 2010 WAMS & PMU

10 10 Wide Area Monitoring (WAMS) : Phasor vs. SCADA Comparison WAMS & PMU

11 11 Wide Area Monitoring (WAMS) : SCADA vs. PMU Measurement WAMS & PMU PMU is the higher time-resolution providing about power system dynamics in comparison with SCADA/EMS

12 12 Wide Area Monitoring (WAMS) : Example for Real time Application Phase Angle Monitoring Voltage Stability Monitoring Power Oscillation Monitoring WAMS & PMU

13 13 WAMS Application Example: Phase Angle Monitoring WAMS & PMU Benefits: Provide operator with real time information about voltage phase angle deviation, Improve voltage control, improve system stability, security and reliability, and operate safety carrying components closer to their limit.

14 14 WAMS Application Example: Voltage Stability Monitoring PMU & WAMS 14 Early warning Emergency alarm Normal Operation WAMS & PMU Benefit: Early warning against voltage collapses, Immediate stop of cascading effects, and Protection against uprising voltage instabilities.

15 15 WAMS Application Example: Power Oscillation Monitoring EGAT System Status: Normal, Warning and Alarm WAMS & PMU WAMS Benefit: Detection of oscillation, Assessment of power system damping, Increase power transfer at defined security, and Early warning to avoid power system collapse.

16 16 Benefit of Using PMU in EGAT & Trend for Smart Grid Real time monitoring Post-disturbance analysis Adaptive protection Power system restoration WAMS & PMU Goal & Benefits Source: Dr. Luigi Vanfretti, KTH Sweden

17 17 Benefit of Using PMU in EGAT &Trend Smart Grid: Real time monitoring 17 To provide operators with real time knowledge of system conditions Goal Improve calculation for real time path flow and optimal dispatch Provide actual limits of the system instead of the conservative ones from offline calculations Benefits of using PMU WAMS & PMU

18 18 Benefit of Using PMU in EGAT & Trend for Smart Grid: Post Disturbance Analysis To reconstruct the sequence of events after disturbance has occurred Goal Benefits of using PMU Easier to understand sequence of events when using synchronized data from PMU WAMS & PMU

19 19 Benefit of Using PMU in EGAT&Trend for Smart Grid: Adaptive Protection Adapt protection to be appropriate with system condition Goal Benefits of using PMU Improved backup protection Adaptive protection setting to avoid cascading outage WAMS & PMU

20 20 Benefit of Using PMU in EGAT&Trend for Smart Grid: Power System Restoration Assist system operator during restoration with data from PMU Goal Benefits of using PMU System operator have more confidence during restoration Reduce chance of recurrence of system outage Reduce time needed for a system restoration WAMS & PMU

21 21 Benefit of Using PMU in EGAT&Trend for Smart Grid: Smart Transmission Grid WAMS & PMU

22 22 Conclusion EGAT has installed WAMS & PMU since 2005, for monitoring and resolution of power oscillation problem between Central and Southern region. In 2010, more project has installed for visualization of power system in broader scale. The capabilities of PMU for high precision, speed of response and GPS time synchronization make PMU very appropriate for wide area monitoring for protection and control. An Advanced early warning technology for power grids that helps operators to ensure grid reliability by detecting and counteracting the first signs of grid instability. Trend for the Smart Grid for the future. WAMS & PMU


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