How to simulate the voltage fluctuation from the main grid

[Joseph Chou]

Dear All,

I am interested in simulating the case where the voltage from the maingrid (transmission) is fluctuating.
How can I input a time series of voltage magnitude of the slack bus?

I can use COM interface to specify the magnitude of slack bus and use snap shot mode to solve the power flow for each time instant.
But with this method, the voltage control devises will not be controlled in such the way that the time delay of voltage control devices is modeled.

Any suggestions are highly appreciated.

[Roger Dugan]

You simply define a per-unit loadshape and assign it to either Daily, Yearly, or Duty property of Vsource as corresponds to the solution type.

The time delays of the voltage control devices are a separate issue and can be made to work properly. In Snapshot mode, You should use Static control mode (the default), which will sequence the devices according to their defined time delays. The ones with the shortest time delays will be executed first.

You use this control mode whenever the time step is greater than the typical delay time for the control devices. So if you are using a 15-min time step, you still use Static control mode because that is much longer than the typical 30-s to 60-s delay on most voltage control devices (regulators and capacitor switches).

In Static mode, the program executes all control actions that take place before the next time step.

In Time control mode, the program waits until the time is equal or greater than the designated action time.