Multivariable sampled regulators for the co-ordinated control of STATCOM AC and DC voltage

A case of negative interaction is reported between the AC and DC voltage control of a STATCOM installed in a power system. A technique to design a decoupled multivariable sampled regulator for multi-input multi-output systems is applied for the co-ordinated control of STATCOM AC and DC voltage, so as to overcome a potential negative interaction. A comprehensive demonstration is presented by an example power system installed with a STATCOM.