Multi-Input Multi-Output Method for Power Quality Monitoring

For power quality mornitoring, most methods test simple input signal, but for each tested object there are many input and output signals. These signals usually exit relevances between valtage and current. This paper proposes a test model of Multi- Input Multi-Output (MIMO) model including theory and algorithm design. The theory of the derivation process is given based on mean of least squares (LS). The algorithm is designed in the form of MIMO matrix iterative. To confirm the order of polynomial it introduces a method of gradient descent. As an example of application a simulation is given. The comparation shows that it can get all inter harmonics parameters in whole frequency range in once test. It is already used as power quality monitoring in power system. The system may be served as a reference that requires dynamic monitoring system in parallel with inter-harmonic.