feat: calculate interzone capacity

[ywang303]

Pull Request doc

Purpose

The method calculates the aggregate transmission capacity (from + to) at zone level for each zone id. It is implemented in a similar way as "calculate_substation_capacity" method, but mapping for zone level.

What the code is doing

• assign corresponding zone_id to the ends of each branch according to 'from_bus_id' and 'to'_bus_id'

• filter branches: exclude those branches from and to the same zone

• calculate the marginal transmission capacities by each unique 'from_zone_id" and by each unique 'to_zone_id' from filtered branches

• calculate total transmission capacity for each zone by adding up 'from capacity' and 'to capacity' by each zone id

Value -> Values

grid->total transmission capacity by each zone for the grid

Testing

from powersimdata.design.transmission.substations import calculate_zone_capacity
from powersimdata.input.grid import Grid
grid = Grid("Western")
calculate_interzone_capacity(grid)

[rouille]

I am wondering if the name of the function clearly communicate what is being done. I feel like discarding intra-zone branches should be reflected somehow in the name of the function. What about calculate_interzone_capacity?

[rouille]

We have a git guide available here where you will find our commit message convention. You can reword your commit message to follow our convention with an interactive rebase.

[ywang303]

Finished all the script revision, would you please recheck to see if I shall make any modifications @BainanXia @jon-hagg @rouille

[BainanXia]

Clean.