# Description

The MMC-2P cell block implements a bipolar bridge with a capacitor. Series RC snubber circuits are connected in parallel with each switch device. Press Help for suggested snubber values when the model is discretized. The gates are controlled by Double signals. The following figure presents the equivalent electrical circuit of the MMC cell block implement a unipolar bridge.

The voltage between A and B is determined by the switching applied to g1 to g4. g1 and g2 must be complementary and so does g3 and g4.

The RC snubber in shunt with the switch is required to solve numerical oscillation. Using the time step and the equivalent inductance of the circuit the value of the Rsnubber and Csnubber are given by the following equation.

$$
R_{\text { Snubber }}=\frac{\pi}{\text { Ts } \cdot 5} \cdot \mathrm{L}_{\text { eq }} \cdot \frac{1}{\text { nbcells }}
$$
$$
\mathrm{C}_{\text { Snubber }}=\frac{1}{\left(\mathrm{L}_{\mathrm{eq}} \cdot \frac{2 \cdot \pi}{\mathrm{T} \mathrm{s} \cdot 15}\right)^{2}} \cdot \mathrm{nbcell} \mathrm{s}
$$

Where nbcells is the number of cells in series and Leq is the equivalent inductance