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1. GOVERNMENT ENGINEERING COLLEGE BHARUCH SUBJECT :- P.S.O.C. TOPIC:-STATE ESTIMATION Submitted by:- Enroll. No. :- 120140109071 Name:- Divyesh B. Parekh ELECTRICAL…
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  • 1. GOVERNMENT ENGINEERING COLLEGE BHARUCH SUBJECT :- P.S.O.C. TOPIC:-STATE ESTIMATION Submitted by:- Enroll. No. :- 120140109071 Name:- Divyesh B. Parekh ELECTRICAL DEPARTMENT (8TH SEM)
  • 2. State Estimation  assigning a value to an unknown system state variable based on measurements from that system according to some criteria.  The process involves imperfect measurements that are redundant and the process of estimating the system states is based on a statistical criterion that estimates the true value of the state variables to minimize or maximize the selected criterion.  Most Commonly used criterion for State Estimator in Power System is the Weighted Least Square Criteria
  • 3. State & Estimate  What’s A State? The complete “solution” of the power system is known if all voltages and angles are identified at each bus. These quantities are the “state variables” of the system.  Why Estimate?  Meters aren’t perfect.  Meters aren’t everywhere.  Very few phase measurements  SE suppresses bad measurements and uses the measurement set to the fullest extent
  • 4. State variable & Input to estimator  In the Power System, The State Variables are the voltage Magnitudes and Relative Phase Angles at the System Nodes.  The inputs to an estimator are imperfect power system measurements of voltage magnitude and power, VAR, or ampere flow quantities.  The Estimator is designed to produce the “best estimate” of the system voltage and phase angles, recognizing that there are errors in the measured quantities and that they may be redundant measurements.
  • 5. State Estimator output  Bus voltages, branch flows, …(state variables)  Measurement error processing results  Provide an estimate for all metered quantities  Filter out small errors due to model approximations and measurement inaccuracies.  Detect and identify discordant measurements, the so- called bad data.
  • 6. Case 1 :- Suppose we use M13 and M32 and further suppose that M13 and M32 gives us perfect readings of the flows on their respective transmission lines.
  • 7. Measurement with accurate meters
  • 8. Case-2: use only M12 and M32.
  • 9. Case2-result of system flow. (M12 & M32)
  • 10. THANK YOU
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