10-kVA converter, LCL filter

This example simulates a grid-following-controlled converter connected to a strong grid through an LCL filter. The control system includes a phase-locked loop (PLL) to synchronize with the grid, a current reference generator, and a PI-type current controller. The LCL filter dynamics are not taken into account in the control system.

from motulator.grid import control, model, utils

Compute base values based on the nominal values.

nom = utils.NominalValues(U=400, I=14.5, f=50, P=10e3)
base = utils.BaseValues.from_nominal(nom)

Configure the system model.

ac_filter = model.LCLFilter(
    L_fc=0.073 * base.L, L_fg=0.073 * base.L, C_f=0.043 * base.C, u_f0_ab=base.u
)
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.

inner_ctrl = control.CurrentVectorController(
    i_max=1.5 * base.i, L=0.073 * base.L, T_s=100e-6
)
ctrl = control.GridConverterControlSystem(inner_ctrl)

Set external references.

# Set the active and reactive power references
ctrl.set_power_ref(lambda t: (t > 0.02) * 5e3)
ctrl.set_reactive_power_ref(lambda t: (t > 0.04) * 4e3)

Create the simulation object and simulate it.

sim = model.Simulation(mdl, ctrl)
res = sim.simulate(t_stop=0.08)

Plot the results.

utils.plot(res, base)

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