Quickstart#

Install the package and run a shipped system:

pip install hermess

import hermess

hermess.list_systems()                      # the systems that ship with the package
dae = hermess.simulate("3bus", T_end=5.0)   # run one and get the finished model back

The returned object holds the trajectories, so a first plot is three lines:

import matplotlib.pyplot as plt
import numpy as np

v = dae.grid.yf["1"]                        # bus 1 voltage, rectangular coordinates
plt.plot(dae.time_steps, np.hypot(v[0], v[1]))
plt.show()

Any simulation setting can be passed as a keyword argument, for example a longer horizon, quasi-static lines or a small-signal study at the operating point:

dae = hermess.simulate("ieee39", line_dyn=False, T_end=10.0,
                       small_signal_analysis=True)
dae.print_modal_report()

From here: