Transient Mitigation in Islanded Microgrid with Modified Virtual Oscillator Control

Sanjna Salim, C A Babu, Bindu M Krishna

Abstract


Virtual Oscillator Control is a modern inverter control scheme for grid-forming inverters with specific advantages of high dynamic response and simplicity in implementation, provided by the time domain approach of its nonlinear oscillator. The method works on the principle of synchronisation of coupled oscillators with the general approach of VOC derived from mutual coupling between the inverter and the control oscillator, leading to a convergence in dynamics to a common trajectory. This approach inherently allows the dynamics of the oscillator and inverter to influence each other. This will affect the common dynamics in the event of transient scenarios. Here we propose an improved mode of VOC, with an independent DC drive for the control oscillator, which provides a master-slave relation between the oscillator and inverter, thus enhancing the efficiency of VOC in the mitigation of transients under switching of different combinations of reactive loads.  Further, a feedback strategy is proposed, wherein small perturbations in terms of the difference between the desired output and the real output of the inverter are introduced into the dynamics of the oscillator. This method is found to be effective in suppressing the disturbances induced during the switching of specific combinations of reactive loads.  The results indicate that the proposed mode of VOC, with independent DC drive and delayed feedback, can provide considerable improvement in the performance of conventional VOC for inverter-based microgrids.


Keywords


Virtual Oscillator Control(VOC), Van der Pol(VdP) oscillator, Coupling, Delayed feedback, transients.

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v15i4.15025.g9134

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