Frequency Trajectory Planning Strategy Considering Transient and Steady-State Frequency Safety

As the proportion of grid-connected converters increase, the frequency stability of power systems is affected, requiring converters to participate in frequency regulation for safety. Damping and Inertia Control provides inertia damping support for the power grid but is limited by challenges in optimal control parameters determining, which leads to higher regulation costs. First-order frequency trajectory planning (FTP) control reduces the converter's frequency regulation power without requiring grid operation parameters. But it doesn't consider transient and steady-state frequency deviations simultaneously. To address this issue, this paper proposes a converter frequency regulation strategy based on a double exponential function, which accounts for both steady-state and transient frequency deviations, as well as economic considerations. The double exponential function is used to model the system's frequency response, accounting for transient frequency deviations, steady-state frequency deviations, and the rate of change of frequency (RoCoF). When the system frequency exceeds thresholds, the strategy adjusts frequency autonomously and responds adaptively to disturbances, which improves both safety and economic efficiency in converter frequency regulation.