Controlling time-variant virtual inertia: A dynamic programming approach

The current power system is evolving into a low-inertia system due to the integration of renewable energy resources such as wind power. Virtual inertia can be emulated by power electronic devices to provide the frequency support and can be time-variant. How to control the time-variant virtual nertia after a disturbance becomes a question. In this work, we formulate this problem as an optimal control problem, dynamic programming is employed as an algorithm to deal with it. Then we test this method on a 2-bus system and a 12-bus system, and results verify the effectiveness of the proposed method, and show that the frequency of power system can be well regulated while certain constraints can be strictly satisfied.