Filters

The predefined filter models are presented after the example.

In order to create a custom filter, a new entry can be added to examples/grid/pars/grid_parameter_sets.json under filters following the structure of the existing ones. Required parameters are an unique name for the filter model, and resistance, inductance and capacitance values. Filterless system can also be used with the No_Filter entry.

Example — Adding an LCL filter to grid_parameter_sets.json

"LCL_Filter_fr_1300": {
            "L_fc_SI": 3e-3,
            "R_fc_SI": 0.1,
            "C_SI": 10e-6,
            "R_c_SI": 1e-3,
            "L_fg_SI": 3e-3,
            "R_fg_SI": 0.1
}

Predefined Filters

\(\mathrm{LCL}\) filter (\(f_r = 1300\,\mathrm{Hz}\)) (LCL_Filter_fr_1300)

Parameter	Symbol	Value
Filter converter-side inductance	\(L_{\mathrm{fc}}\)	\(3\,\mathrm{mH}\)
Filter converter-side resistance	\(R_{\mathrm{fc}}\)	\(0.1\,\Omega\)
Filter capacitance	\(C\)	\(10\,\mu\mathrm{F}\)
Damping resistor (capacitor)	\(R_c\)	\(1\,\mathrm{m}\Omega\)
Filter grid-side inductance	\(L_{\mathrm{fg}}\)	\(3\,\mathrm{mH}\)
Filter grid-side resistance	\(R_{\mathrm{fg}}\)	\(0.1\,\Omega\)

\(\mathrm{LCL}\) filter (\(f_r = 380\,\mathrm{Hz}\)) (LCL_Filter_fr_380)

Parameter	Symbol	Value
Filter converter-side inductance	\(L_{\mathrm{fc}}\)	\(0.4\,\mathrm{mH}\)
Filter converter-side resistance	\(R_{\mathrm{fc}}\)	\(0.5\,\mathrm{m}\Omega\)
Filter capacitance	\(C\)	\(850\,\mu\mathrm{F}\)
Damping resistor (capacitor)	\(R_c\)	\(0.4\,\mathrm{m}\Omega\)
Filter grid-side inductance	\(L_{\mathrm{fg}}\)	\(0.4\,\mathrm{mH}\)
Filter grid-side resistance	\(R_{\mathrm{fg}}\)	\(0.5\,\mathrm{m}\Omega\)

No filter (No_Filter)

Direct connection to the grid without any filter.