Patent ID: 10651771

Abstract:
This invention discloses a controller and method to operate a power electronic converter as a virtual synchronous machine with bounded frequency and virtual flux. The controller includes a real power-frequency channel to regulate the frequency, a reactive power-flux channel to regulate the virtual flux (equivalently, the voltage), an interconnection block that takes the frequency, the virtual flux, and an input current to generate a voltage, a signal {tilde over (T)}, and a signal {tilde over (Γ)} that are fed through a conversion block and two passive filters to generate the negative real power and reactive power feedback signals, a virtual damper to generate an output voltage as the control signal for the power electronic converter according to the voltage generated by the interconnection block and a first measured voltage, and a virtual impedance to generate a virtual current according to the difference of the output voltage and a second measured voltage. The controller also includes auxiliary blocks to achieve self-synchronization without measuring or estimating the grid frequency and the regulation of real power and reactive power to given reference values without static errors.