Zhaojian Wang

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This paper addresses the distributed optimal frequency control of multi-area power system with operational constraints, including the regulation capacity of individual control area and the power limits on tie-lines. Both generators and controllable loads are utilized to recover nominal frequencies while minimizing regulation cost. We study two control(More)
In Part I of this paper we propose a decentralized optimal frequency control of multi-area power system with operational constraints, where the tie-line powers remain unchanged in the steady state and the power mismatch is balanced within individual control areas. In Part II of the paper, we propose a distributed controller for optimal frequency control in(More)
This paper addresses the distributed optimal fre-<lb>quency control of power systems considering a network-<lb>preserving model with nonlinear power flows and excitation<lb>voltage dynamics. Salient features of the proposed distributed<lb>control strategy are fourfold: i) nonlinearity is considered to<lb>cope with large disturbances; ii) only a part of(More)
Stand-alone direct current (DC) microgrids may belong to different owners and adopt various control strategies. This brings great challenge to its optimal operation due to the difficulty of implementing a unified control. This paper addresses the distributed optimal control of DC microgrids, which intends to break the restriction of diversity to some(More)
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