A weak power grid-oriented water-light storage station virtual inertia adaptive matching and frequency stability control method

Abstract

The application discloses a kind of water light storage station virtual inertia adaptive matching and frequency stability control methods for weak power grid, comprising: collecting electrical quantity and energy storage state data, and extracting mid-frequency oscillation component after pre-processing;The order of fractional order is dynamically adapted by fractional order dynamic embedding, and the virtual rotor angular frequency is obtained by solving the fractional order virtual synchronous machine equation;The Hilbert transform and short-time Prony analysis are carried out on the mid-frequency oscillation component, the coupling strength operator is calculated by multi-modal singular spectrum analysis, and the damping trap flag is determined in combination with the operating state;The phase space reconstruction and local linearization prediction are carried out by constructing fusion sequence, the virtual inertia and damping control instruction are output by solving the constrained quadratic programming and feeding forward-feedback fusion;The joint cost function is calculated and the parameters are adjusted synchronously, and the instruction is sent to the energy storage converter.The application realizes fractional order inertia and sensitive frequency band dynamic matching, damping trap detection suppression and predictive frequency control, and improves the frequency robustness of weak power grid.