Adaptive Two-Stage Droop Control Method for Islanded DC Micro-grids

doi:10.16628/j.cnki.2095-8188.2021.08.011

Abstract

Abstract:

An adaptive two-stage droop control method is proposed for islanded DC micro-grids.A time-delay feedforward path is deployed in the droop relation,through which the system can maintain economic operation by meeting the equal incremental cost principle while restoring the DC bus voltage adaptively at the same time.Detailed small-signal analysis is conducted to illustrate the impacts of different control parameters on system stability.In addition,two plug-and-play strategies are presented to enhance the system robustness and reliability,one with full autonomy and one with distributed communication.Finally,the simulation results verify the effectiveness of the proposed control method.

Key words: DC micro-grids, droop control, equal incremental cost, adaptive

CLC Number:

TM73

LIU Wenliang. Adaptive Two-Stage Droop Control Method for Islanded DC Micro-grids[J]. LOW VOLTAGE APPARATUS, 2021, 0(8): 58-63.

Figures/Tables 18

References 12

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参数	传统下垂控制	自适应下垂控制
电压稳态最大偏差/V	5.30	0.02
总运行成本/ p.u.	1.43	1.34