Читать книгу Advances in Electric Power and Energy - Группа авторов - Страница 43

The voltage measurement at bus 1 (Figure 2.1) is considered to be 1.05 instead of 1.0933, i.e. a bad measurement is introduced. Solving the estimation problem, the optimal objective function value is .

The test threshold at 0.99 confidence level (α = 0.01) with 10 + 2 − 7 = 5 degrees of freedom is χ²(0.99,5) = 15.0863. Therefore, since χ²(0.99,5) < 16.6008, we conclude that bad data plague the measurement set with a 0.99 confidence level.

For the initial case and since , no bad data affect the measurement set with at 0.99 confidence level.