Observer Design for Estimation of Nonobservable States in Buildings

Figure 6

Comparison of estimation errors in logarithmic scale for all of the observers. During initial 100 seconds contraction, semigroup design shows the fastest error vanishing (corresponding to error less than 1°C). In that period, eigenvalue shfting design introduces transitional error up to an order of magnitude greater than the initial one. After 100 seconds, eigenvalue shifting design reduces error faster but then starts oscillating. Contraction semigroup design reduces error monotonically till the end.