Realizing Unified Microgrid Voltage Profile and Loss Minimization: A Cooperative Distributed Optimization and Control Approach

    Authors

    A. Maknouninejad;Z. H. Qu

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Smart Grid

    Keywords

    Cooperative control; distributed generators (DGs); distributed; optimization; loss minimization; microgrid; smart grid; LOAD-SHARING CONTROL; DISTRIBUTION NETWORKS; POWER-GENERATION; SOURCE; INVERTERS; MANAGEMENT; STRATEGY; SYSTEMS; DESIGN; UNITS; Engineering, Electrical & Electronic

    Abstract

    Cooperative distributed optimization is proposed in this paper to optimally dispatch the reactive power of the distributed generators (DGs). The overall objective is to minimize the cost function that is the sum of all quadratic voltage errors of the DG nodes and other critical nodes in the system. It is assumed that each DG is only aware of its own cost function defined as the quadratic voltage error of its respective node. In the proposed method, every DG performs optimization with respect to its own objective function while considering the information received locally from the neighboring nodes in the microgrid, and the critical nodes without DG also contribute to optimization. The proposed distributed optimization and control scheme enables the microgrid to have a unified voltage profile, and incorporating the subgradient method facilitates its application even when the microgrid information is unknown. Microgrid active power loss is also investigated, and it is shown that the unified voltage profile naturally leads to the overall active power loss minimization as well. Stability analysis and criteria are provided. Simulation results of a typical microgrid illustrate superior performance of the proposed technique.

    Journal Title

    Ieee Transactions on Smart Grid

    Volume

    5

    Issue/Number

    4

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    1621

    Last Page

    1630

    WOS Identifier

    WOS:000338191200009

    ISSN

    1949-3053

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