Secure control system comprising a power converter furnished with an inverter module intended to be connected to an electrical load and a control unit intended to determine control signals to be applied to the inverter module so as to control the electrical load, the control unit comprising - an electronic processing unit which comprises: - a first electronic processing circuit designed to determine a current signal (I S_HW) supplying the electrical load, - a second electronic processing circuit designed to determine a voltage signal (U S_HW) applied to the electrical load, - a software processing unit receiving said current and voltage signals with a view to determining said control signals for the electrical load, said system being characterized in that: - the first electronic processing circuit comprises means for estimation of a value of angular frequency (I P_HW) or of phase of the current on the basis of the current signal, - the second electronic processing circuit comprises means for estimation of a value of angular frequency (U P_HW) or of phase of the voltage on the basis of the voltage signal, - the software processing unit comprises a first software module for estimation of an angular frequency value (Val1 P_SW) or of a phase value, - the electronic processing unit comprises an electronic comparison unit designed to compare the value of angular frequency I P_HW) or of phase estimated by the first electronic processing circuit, the value of angular frequency (U P _ HW) or of phase estimated by the second electronic processing circuit and the value of angular frequency (Val1 P_SW) or of phase estimated by the first software module of the software processing unit, - the electronic comparison unit comprises a first channel for inhibition of the inverter module of the power converter. - an electronic processing unit which comprises: - a first electronic processing circuit designed to determine a current signal (I S_HW) supplying the electrical load, - a second electronic processing circuit designed to determine a voltage signal (U S_HW) applied to the electrical load, - a software processing unit receiving said current and voltage signals with a view to determining said control signals for the electrical load, said system being characterized in that: - the first electronic processing circuit comprises means for estimation of a value of angular frequency (I P_HW) or of phase of the current on the basis of the current signal, - the second electronic processing circuit comprises means for estimation of a value of angular frequency (U P_HW) or of phase of the voltage on the basis of the voltage signal, - the software processing unit comprises a first software module for estimation of an angular frequency value (Val1 P_SW) or of a phase value, - the electronic processing unit comprises an electronic comparison unit designed to compare the value of angular frequency I P_HW) or of phase estimated by the first electronic processing circuit, the value of angular frequency (U P _ HW) or of phase estimated by the second electronic processing circuit and the value of angular frequency (Val1 P_SW) or of phase estimated by the first software module of the software processing unit, - the electronic comparison unit comprises a first channel for inhibition of the inverter module of the power converter. - a first electronic processing circuit designed to determine a current signal (I S_HW) supplying the electrical load, - a second electronic processing circuit designed to determine a voltage signal (U S_HW) applied to the electrical load, - a software processing unit receiving said current and voltage signals with a view to determining said control signals for the electrical load, - the first electronic processing circuit comprises means for estimation of a value of angular frequency (I P_HW) or of phase of the current on the basis of the current signal, - the second electronic processing circuit comprises means for estimation of a value of angular frequency (U P_HW) or of phase of the voltage on the basis of the voltage signal, - the software processing unit comprises a first software module for estimation of an angular frequency value (Val1 P_SW) or of a phase value, - the electronic processing unit comprises an electronic comparison unit designed to compare the value of angular frequency I P_HW) or of phase estimated by the first electronic processing circuit, the value of angular frequency (U P _ HW) or of phase estimated by the second electronic processing circuit and the value of angular frequency (Val1 P_SW) or of phase estimated by the first software module of the software processing unit, - the electronic comparison unit comprises a first channel for inhibition of the inverter module of the power converter.