'Convert system representation to `ZerosPolesGain`.
Parameters
kwargs : dict, optional
Additional keywords passed to `ss2zpk`
Returns
sys : instance of `ZerosPolesGain`
Zeros, poles, gain representation of the current system'

def to_zpk(self, **kwargs):

    return ZerosPolesGain(*ss2zpk(self._A, self._B, self._C, self._D, **kwargs), **self._dt_dict)
