Coordinating voltage regulation for an AC–DC hybrid distribution network with multiple SSTs

The Journal of Engineering

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[1] Collage of Electrical Engineering and Information Technology, Sichuan University, Chengdu 610065, People's Republic of China;

关键词: invertors;    power distribution control;    power supply quality;    load flow;    voltage control;    power transformers;    controllability;    multiple SSTs;    distribution network performance;    coordinated operation model;    fast voltage regulation;    hybrid active distribution network;    DC load;    hybrid optimal power flow;    AC−DC subsystems;    current distribution systems;    uncertain voltage variations;    AC−DC hybrid distribution network;    controllability;    modified IEEE 33-AC−DC hybrid power distribution system;    renewable generation penetration;    solid-state transformer;    dispersed sustainable energy;    voltage profile;    fast fluctuating distributed generator output;    invertor-based solar power penetration;    power-quality performance enhancement;   

DOI  :  10.1049/joe.2018.8537

来源: publisher

【 摘 要 】

The increasing penetration of renewable generation and large implementation of the DC loads are challenges that stress the current distribution systems by causing uncertain voltage variations. The AC−DC hybrid distribution network is seen as an innovative solution to address the problem of accommodating highly dispersed sustainable energy. Specifically, the solid-state transformer (SST), which is capable of enhancing power-quality performance and controllability of the power distribution, has attracted increasing focus in this decade as a promising advanced converter. It is of great interest to investigate how to operate the multiple SSTs with different modes in a coordinated manner to optimise the distribution network performance. This paper formulates the coordinated operation model for multiple SSTs to enable fast voltage regulation for the hybrid active distribution network equipped with large-scale penetration of invertor-based solar power and DC load. A hybrid optimal power flow describing the controlling modes of SSTs and operating interaction between AC−DC subsystems is proposed in this paper. The case studies on a modified IEEE 33-AC−DC hybrid power distribution system show that the voltage profile can be optimised by using the flexible controlling resource of SSTs, facilitating the timely performance adjustment in the presence of fast fluctuating distributed generator's output.

【 授权许可】

CC BY