What is it about?

This study proposes the convex model for active distribution network expansion planning integrating dispersed energy storage systems (DESS). Four active management schemes, distributed generation (DG) curtailment, demand side management, on-load tap changer tap adjustment and reactive power compensation are considered. The optimization of DESS for peak shaving and operation cost decreasing is also integrated. The expansion model allows alternatives to be considered for new wiring, new substation, substation expansion and DG installation. The distribution network expansion planning (DNEP) problem is a mixed integer non-linear programming problem. Active management and uncertainties especially with the DG integration make the DNEP problem much complex. To find the suitable algorithm, this study converts the DNEP problem to a second-order cone programming model through distflow equations and constraints relaxation. A modified 50-bus application example is used to verify the proposed model.

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Why is it important?

This paper (i) proposes the SOCP model for ADNEP considering practical operation constraints and DESS at the first time and applying to the application example; (ii) raises the consciousness that the active distribution network planning should be accompanied closely with the system operation.

Perspectives

The proposed model proves to be flexible as the easy method to change the active management schemes and system expansion alternatives. From the case study results, the active management schemes can decrease the investment, the more active management schemes limited, the total cost increased. The practical operation constraints make the system expansion planning more suitable with the real system. With DESS and active management schemes, the DG penetration can be increased and the system objectives are always reached by supporting the quality of the supply. The ADNEP result should closely integrate the distribution network operation, thus, the planning scheme can play a positive role.

Mr haijun xing

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This page is a summary of: Active distribution network expansion planning integrating dispersed energy storage systems, IET Generation Transmission & Distribution, February 2016, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-gtd.2015.0411.
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