In the existing control problems for the leader-follower multiagent systems, the leader's dynamics are independent of the followers. In this paper, we consider a tracking control problem for an interconnected leader-follower multiagent system, where the leader's dynamics are interconnected with the states of the followers. It is shown that such a problem can be used to model the autonomous power sharing problem of grid-connected microgrids. In order to solve this problem, a distributed control law using only local information is synthesized. Simulation results are provided to show the effectiveness of the proposed control law.