AC/DC converter control
Static converters for mcc speed variation

Here, we will only consider problems relating to control. In particular, we'll assume that their various properties are known: reversibility, reactive power consumption, minimizing circuit combinations and protection. Unless otherwise specified, we will only consider the case of continuous conduction. If necessary, we'll take encroachment into account. The external characteristic is then written as : $\begin{array}{l}\text{<}v\text{>}=U_0\text{cos}\psi -R_c\text{<}i\text{>}\text{ pour les ponts tout thyristors}\\ \text{ <}v\text{>}=U_0\frac{1+\text{cos}\psi }{2}-R_c\text{<}i\text{>}\text{ pour les ponts mixtes}\end{array}\}$