Improved droop control strategy for distributed photovoltaic power generation systems

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS Frontiers in Energy Research Pub Date : 2024-08-30 DOI:10.3389/fenrg.2024.1430580
Deng Zhengwan, Gao Ningyu, Zhu Yali
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Abstract

The control strategy of a distributed photovoltaic (PV) power generation system within a microgrid consists of an inner-loop controller and an outer-loop controller. The inner-loop controller is divided into two types, namely, the maximum power point tracking (MPPT) control strategy and DC bus voltage support strategy. Switching between these two control strategies results in issues such as DC bus overvoltage, system oscillations, or even PV system failure. An improved droop control strategy with a novel inner-loop controller is proposed, incorporating an output power derivative regulator. The control system unifies MPPT and DC bus voltage support strategy without switching the controller structure. A simulation model is built to validate the effectiveness of the proposed control strategy, and the results show that the ripple of DC bus voltage decreases by more than 60%.
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分布式光伏发电系统的改进型下垂控制策略
微电网中分布式光伏发电系统的控制策略由内环控制器和外环控制器组成。内环控制器分为两种,即最大功率点跟踪(MPPT)控制策略和直流母线电压支持策略。在这两种控制策略之间切换会导致直流母线电压过高、系统振荡甚至光伏系统故障等问题。本文提出了一种改进的下垂控制策略,该策略采用新型内环控制器,并结合了输出功率导数调节器。该控制系统统一了 MPPT 和直流母线电压支持策略,无需切换控制器结构。建立了一个仿真模型来验证所提控制策略的有效性,结果表明直流母线电压纹波降低了 60% 以上。
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来源期刊
Frontiers in Energy Research
Frontiers in Energy Research Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
3.90
自引率
11.80%
发文量
1727
审稿时长
12 weeks
期刊介绍: Frontiers in Energy Research makes use of the unique Frontiers platform for open-access publishing and research networking for scientists, which provides an equal opportunity to seek, share and create knowledge. The mission of Frontiers is to place publishing back in the hands of working scientists and to promote an interactive, fair, and efficient review process. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria
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