This papers reports a case of negative interaction between the AC and DC voltage control of a STATCOM installed in a power system. A novel technique to design a decoupled multivariable Sampled Regulator (SR) for Multi-Input Multi-Output (MIMO) 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.
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