Secondary voltage controls of virtual‐droop‐controlled bidirectional DC/DC converters in hybrid energy storage system. Issue 14 (1st November 2020)

• Record Type: Journal Article
• Authors: Cheng, Long; Zhang, Zehua; Zhang, Fanghua
• Is Part Of: IET power electronics. Volume 13:Issue 14(2020)
• Page Start: 3018
• Page End: 3025
• Publication Date: 2020-11-01
• Subjects: power generation control -- DC‐DC power convertors -- voltage control -- decentralised control -- distributed power generation -- energy storage; frequency domain allocation -- secondary voltage controls -- SVC -- output voltage deviation -- battery converter -- virtual resistance droop control -- SC converter -- input voltage -- virtual capacitance droop control -- consistent settling time -- controller parameters -- hybrid energy storage system -- decentralised control strategy -- virtual impedance droop controlled bidirectional DC/DC converters -- state‐of‐charge limitation -- settling time; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2019.1566
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : For a hybrid energy storage system consisting of battery and super‐capacitor (SC) in More Electric Aircraft, a decentralised control strategy, which is based on the virtual impedance droop control, can implement the frequency domain allocation of load power avoiding communication delay and a single point of failure. Although the output voltage deviation and state‐of‐charge (SoC) limitation are solved by existing methods, it still suffers from settling time extending. Secondary voltage controls (SVCs) of virtual‐droop‐controlled for battery and SC are proposed to solve the issue. SVC for the output voltage is designed to compensate for the output voltage deviation in the battery converter based on virtual resistance droop control. SC converter, which is controlled by the SVC for input voltage in virtual capacitance droop control, enforces SC SoC back to the initial value and maintains consistent settling time. In this study, a set of detailed design methods for the controller parameters of SVC are developed not only to regulate the output voltage and SoC recovery but also to keep the same settling time. The results of the simulation and experiment validate the effectiveness of the proposed SVC and design method.