for example the state vector which has been estimated with 9 number of PMUs is more accurate than the state vector which has been estimated with 4 number of PMUs?
Yes, the number and locations of PMUs within a power grid significantly affect the accuracy of the state estimation. There is a huge number of publications that consider this critical issue. Placing PMUs at all possible locations would be the technically perfect monitoring scheme, while it is the worst economical decision. Most of the literature determined a techno-economic feasible number and locations of MPUs for WAM. You will find many techniques for placements of PMUs.
Yes, the number and locations of PMUs within a power grid significantly affect the accuracy of the state estimation. There is a huge number of publications that consider this critical issue. Placing PMUs at all possible locations would be the technically perfect monitoring scheme, while it is the worst economical decision. Most of the literature determined a techno-economic feasible number and locations of MPUs for WAM. You will find many techniques for placements of PMUs.
Yes, it is effective, but not necessarily more PMUs result in more accuracy! This depends on optimal location of PMUs. If PMUs placed in correct locations, more PMUs cause more accuracy. Of course you have to consider economic issues and find the optimal number of PMUs, which could obtain desired accuracy with sensible cost.
The number of PMUs are going to increase the number of measurements available for state estimation purpose. So the redundant measurements will improve the accuracy and reliability can also be improved as those extra measured values can be used in place of unavailable states in case of any communication failure etc.
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