This paper considers H_∞ consensus problems for first-order multi-agent systems with multiple time-varying
communication delays and external disturbances. Both networks under fixed and switching topologies are taken into
consideration. Firstly, a model transformation is performed, and the original system is turned into a reduced order system.
Then, based on the reduced order system, by constructing a proper Laypunov function, sufficient conditions are derived for
all agents to reach an agreement with the desired H_∞ performance. Finally, the simulation results show the correctness and
effectiveness of the designed protocols.