Improved Bidirectional Droop Control of Hybrid AC-DC Microgrid Interface Converter

Yan JIA; Kai SHI; Peifeng XU; Zhengqi CHA; Yuyang CHEN

doi:10.16513/j.2096-2185.DE.2308401

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Distributed Energy ›› 2023, Vol. 8 ›› Issue (4) : 1-10. DOI: 10.16513/j.2096-2185.DE.2308401

Basic Research

Improved Bidirectional Droop Control of Hybrid AC-DC Microgrid Interface Converter

Yan JIA ¹ ,
Kai SHI ¹ ,
Peifeng XU ¹ ,
Zhengqi CHA ² ,
Yuyang CHEN ¹

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Abstract

Focusing on low inertia and low damping problems in the droop control for bidirectional interface converters (BICs) in hybrid AC-DC microgrid, an improved bidirectional droop control strategy applied to BICs is proposed. By improving the active power loop and introducing an inertia link and a limiting coefficient, the system can not only provide inertia, reduce the impact of load fluctuations on AC bus frequency and DC bus voltage, improve the dynamic response of power transmission between AC and DC subnets, but also improve the anti-interference and dynamic response characteristics of hybrid AC-DC hybrid microgrid. By introducing a nonlinear disturbance observer into the current loop, transient fluctuations in load power can be suppressed, and the amplitude of bus voltage fluctuations under external power disturbances can be suppressed. The article provides a detailed analysis of the impact of key parameters on system stability, and verifies the correctness and effectiveness of the proposed control strategy by PSCAD/EMTDC simulation. It also compares and analyzes the dynamic response of AC frequency and DC voltage as well as power transmission under different control strategies when load changes, highlighting the superiority of the proposed control strategy.

Key words

hybrid AC-DC microgrid / bidirectional interface converter / nonlinear disturbance observer / microgrid stability / improved bidirectional droop control

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Yan JIA , Kai SHI , Peifeng XU , et al . Improved Bidirectional Droop Control of Hybrid AC-DC Microgrid Interface Converter[J]. Distributed Energy Resources. 2023, 8(4): 1-10 https://doi.org/10.16513/j.2096-2185.DE.2308401

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