The Method of Continuous Frequency Emergency Control Considering Transient Short-time Power Shock

With the large-scale access of UHV direct current and new energy sources, transient short-time power shocks such as low voltage ride-through of new energy sources and DC commutation failure make the frequency evolution of power grid highly uncertain. The existing frequency emergency control mode strategy based on feedforward control law is difficult to formulate, and the one-time total active power control mode adopted is easy to induce chain high-frequency risk. Firstly, based on the feedforward control theory, the existing frequency emergency control principle and key influencing factors were expounded. Secondly, the influence of transient short-time power shock on the existing frequency emergency control is analyzed. Finally, the method of continuous frequency emergency control was developed by fusing fault event trigger and response trajectory drive. The effectiveness of the proposed control method is verified based on a typical case of the actual power grid, which solves the problem that the existing frequency emergency control is difficult to deal with transient short-time power impact.