# State estimation in power system [closed]

1. Regarding state estimation in electrical power grid, does the voltage phasor magnitude at each bus(P-Q bus and P-V bus) considered as a static state variable or a dynamic state? I am a little bit confused about it.

2. If we consider those bus voltages as static state, can we use dynamic state estimation techniques to get an estimation of those voltage or we only use static state estimation?.

3. If I want to plot the magnitude and phase angle at each bus over time, are there network dynamic models I can use to do so? For example a differential equation of the voltage with parameters such as reactive, real power etc...

(I am working on a summer project on state estimation using phasor measurement units -PMU-)

## closed as too broad by Dmitry Grigoryev, filo, MCG, Bimpelrekkie, mkeithJul 19 '18 at 6:50

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

• Please post one question per post. Some of your questions may have already be answered, and the site allows only a single "target" for such questions. – Dmitry Grigoryev Jul 9 '18 at 7:09

## 1 Answer

Regarding state estimation in electrical power grid, does the voltage phasor magnitude at each bus(P-Q bus and P-V bus) considered as a static state variable or a dynamic state?

Dynamic state, it changes over time.

If we consider those bus voltages as static state, can we use dynamic state estimation techniques to get an estimation of those voltage or we only use static state estimation?

The bus voltages fluctuate usually by a few percent, so you could call the bus voltage fixed or it could be measured. If it isn't measured and the current is measured then use the current to estimate your load and power consumed.

If I want to plot the magnitude and phase angle at each bus over time, are there network dynamic models I can use to do so? For example a differential equation of the voltage with parameters such as reactive, real power etc...

Yes if you get the right meter. You may want to read this. It also depends on if you want 3-phase or 1-phase. Look for power meters, most measure reactive and real power.