Flexible Control and Dynamics Estimation of Grid-forming Converters Considering Grid Frequency Variation

Abstract

Recently, the penetration of new energy sources and power electronics has been increasing. To support the grid, grid-forming control technologies for renewable energy generation have been proposed. Power control is the key technology of grid-forming converters in achieving grid support. However, in these control methods, the dynamic response of the transient power is usually affected by overshoot and oscillation. In order to improve the dynamic response of the injected instantaneous power, a grid-forming control strategy based on synchronous power controller (SPC) is presented in this paper. A new design idea is proposed to simplify the control model of the power loop, which not only enables accurate theoretical modeling of the active power control dynamics but also allows a quick analysis and parameter design. The comparison of theoretical analysis and simulation experiments verifies the effectiveness of the control method in providing auxiliary services that contribute to the angle and frequency stability of the future grid.