Dynamic state estimation enabled preditive inverter control

High penetration of Converter-Interfaced Generation (CIG) presents challenges because there exists no or very little mechanical coupling between CIGs and the power grid. During transients, the operational constraints of the inverters may be exceeded to the point of damaging the inverters or causing the shutdown of the inverters (LVRT logic). This paper proposes a Dynamic State Estimation (DSE) enabled supplementary predictive inverter control scheme to minimize the transients during grid disturbances. This control scheme only uses local information and does not require any communication from the system (remote) side. We first estimate frequency as well as rate of frequency change of the remote side with only local information via DSE, which uses high-fidelity dynamic model of the interested component to provide accurate feedback to the inverter controls. Second, a supplementary predictive inverter control scheme is utilized to control the output frequency, real power as well as the reactive power of the grid-side inverter. Numerical simulations show that the proposed DSE method can accurately estimate remote side frequency as well as rate of frequency change. Additionally, the proposed control scheme can successfully minimize transients during system frequency oscillations.