Coordinated Control Strategy for Hybrid Energy Storage System Based on State of Charge

doi:10.11930/j.issn.1004-9649.2017.01.158.06

Abstract

Abstract: In order to optimize the operation status of hybrid energy storage system, a novel hierarchical coordinated control strategy is proposed, which consists of the upper layer energy management and the lower layer hybrid energy storage control. Based on the micro-grid bus voltage, frequency and the state of charge(SOC) of hybrid energy storage system, the upper layer energy management uses the fuzzy logic algorithm to optimize the charging and discharging power of hybrid energy storage system so as to keep the SOC of energy storage devices within a reasonable range. Based on the low-pass filter and the SOC of lithium iron phosphate battery & supercapacitor, the lower layer hybrid energy storage control establishes the power allocation correction algorithm to optimize the SOC of energy storage system. The simulation results indicate that the proposed hierarchical coordination control algorithm can effectively reduce the SOC’s variation range of hybrid energy storage system and avoid the over charging or over discharging.

Key words: micro-grid, energy storage system, hybrid storage, hierarchical coordinated control, fuzzy control, state of charge

CLC Number:

TM715

LI Hui, HUNANG Yaomei, MA Fei. Coordinated Control Strategy for Hybrid Energy Storage System Based on State of Charge[J]. Electric Power, 2017, 50(1): 158-163.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.01.158.06

https://www.electricpower.com.cn/EN/Y2017/V50/I1/158

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