State Estimation and Voltage Stability Monitoring using ILP PMU Placement
R. Sudha1, Deepak Jain2, Umang Lahoty3, Swati Khushalani4, Nivedita G.5, Jayabarathi T.6

1R. Sudha, Select, VIT University, Vellore, India.
2Umang Lahoty, Select, VIT University, Vellore, India.
3Deepak Jain, Select, VIT University, Vellore, India.
4Swati Khushalani, Select, VIT University, Vellore, India.
5Nedita G, Select, VIT University, Vellore, India.
6Jayabarathi T., Select, VIT University, Vellore, India,
Manuscript received on April 11, 2012. | Revised Manuscript received on April 14, 2012. | Manuscript published on May 05, 2012. | PP: 366-373 | Volume-2 Issue-2, May 2012 . | Retrieval Number: B0619042212/2012©BEIESP
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Abstract: This paper shows various cases under which optimal PMU placement is done. Zero injection busses are also considered for the placement problem which reduces the number of PMU required. For this topology method is used. In case of failure of single PMU, the reliability of the system should be improved. For this the problem formulation is modified according to which each bus is observed by at least two PMUs. The PMU placement is then used to get data for state estimation. The results-voltages and phase angles of bus system are compared with and without PMU using two algorithms- WLS and LAV. It is found that LAV is better algorithm than WLS and errors are reduced if the PMU measurements are included. The PMU data is also used for the voltage stability analysis using two indicesFVSI and LQP. Contingency analysis is done using these under different operating conditions to get an idea of stressful situation of lines randomly chosen.

Keywords: PMU, WLS and LAV, using two indices-FVSI and LQP.