Adaptive Synchronization Frequency Control for Interconnected Micro-grids in Island Mode

doi:10.3969/j.issn.1000-7229.2019.10.011

Abstract

Abstract: On the basis of load frequency control （LFC） related technology， a new generalized dynamic LFC model and a robust decentralized LFC control strategy are proposed in this paper for the power system composed of interconnected micro-grids （MGs） in island mode. Firstly， the LFC mechanisms of a single area and multi-area control system are described， and the classical LFC scheme is applied to power system with changeable scene and interconnected MGs in island mode. Secondly， for a power system with six interconnected MGs in island mode， a kind of coordinated control strategy is proposed on the basis of consistency of LFC algorithm， where by controlling the turbine governor input and managing the amount of energy that energy storage systems （ESS） have to absorb/inject from/into MGs， a new adaptive synchronization frequency control method for islanding MGs is proposed. Then， it is illustrated that ESS under saturation constraint can reduce the instability caused by small inertia and small damping in MGs. Finally， the correctness and effectiveness of the proposed algorithm are verified by the simulation results with the power system including six interconnected MGs， which shows that the proposed controller can minimize the impact of interference and maintain robust performance of the interconnected MGs in island mode.

Key words: adaptive synchronization, micro-grids （MG）, frequency, load frequency control （LFC）, energy storage systems （ESS）

CLC Number:

TM 721

ZHONG Yongjie，ZHAI Suwei，SUN Yonghui. Adaptive Synchronization Frequency Control for Interconnected Micro-grids in Island Mode[J]. Electric Power Construction, 2019, 40(10): 75-83.

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