Coordinated Control of Hybrid Energy Storage System Based on Variational Mode Decomposition

doi:10.11930/j.issn.1004-9649.201708091

Abstract

Abstract: In view of the active power fluctuation and intermittence of photovoltaic (PV) power systems, based on a hybrid energy storage system consisting of super capacitors and lead-acid batteries, a layered active power allocation strategy is formulated to optimize the output power of PV source based on the method of variational mode decomposition (VMD). First, the net load which is supplied by the hybrid energy storage system is decomposed by VMD method. Then the low-frequency components and high-frequency components are allocated to the lead-acid batteries and super capacitors respectively to smooth out the fluctuations of output power of PV. At the same time, the orders of VMD filter are adjusted secondarily according to the state of charge (SOC) and the largest chargable/dischargable power in real time. The simulation tests demonstrate that using this method can effectively smooth out the fluctuation of net load, and the regulation performance and long-term and stable operation of the hybrid energy storage system are able to be optimized.

Key words: independent micro grid, photovoltaic station, hybrid energy storage, variation mode decomposition, power allocation

CLC Number:

TM615
TK02

ZHANG Xiaoyu, ZHANG Jiancheng, WANG Ning, WANG Guan. Coordinated Control of Hybrid Energy Storage System Based on Variational Mode Decomposition[J]. Electric Power, 2018, 51(9): 165-173.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201708091

https://www.electricpower.com.cn/EN/Y2018/V51/I9/165

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