12.5-kVA converter, RFPSC

This example simulates reference-feedforward power-synchronization control (RFPSC) of a converter connected to a weak grid.

from motulator.grid import control, model, utils

Compute base values based on the nominal values.

nom = utils.NominalValues(U=400, I=18, f=50, P=12.5e3)
base = utils.BaseValues.from_nominal(nom)

Configure the system model.

ac_filter = model.LFilter(L_f=0.15 * base.L, R_f=0.05 * base.Z, L_g=0.74 * base.L)
ac_source = model.ThreePhaseSource(w_g=base.w, e_g=base.u)
converter = model.VoltageSourceConverter(u_dc=650)
mdl = model.GridConverterSystem(converter, ac_filter, ac_source)

Configure the control system.

# Control configuration parameters
inner_ctrl = control.PowerSynchronizationController(
    u_nom=base.u, w_nom=base.w, i_max=1.3 * base.i, R=0.05 * base.Z, R_a=0.2 * base.Z
)
ctrl = control.GridConverterControlSystem(inner_ctrl)

Set the references for converter output voltage magnitude and active power.

# Converter output voltage magnitude reference
ctrl.set_ac_voltage_ref(base.u)

# Active power reference
ctrl.set_power_ref(
    lambda t: ((t > 0.2) / 3 + (t > 0.5) / 3 + (t > 0.8) / 3 - (t > 1.2)) * nom.P
)

Create the simulation object, simulate, and plot the results in per-unit values.

sim = model.Simulation(mdl, ctrl)
res = sim.simulate(t_stop=1.4)
utils.plot(res, base)

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