Improved Power Weight Hierarchical Control Strategy for the Photovoltaic DC Boost System

TIAN Yanjun; CHEN Bo; WANG Yi; WEI Shilei; GAO Haonan

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Improved Power Weight Hierarchical Control Strategy for the Photovoltaic DC Boost System

更新时间：2025-12-08

- Improved Power Weight Hierarchical Control Strategy for the Photovoltaic DC Boost System
- Vol. 45, Issue 10, Pages: 3247-3255(2019)
- 作者机构：
  
  华北电力大学河北省分布式储能与微网重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 October 2019，
  
  Published：2019
- 稿件说明：
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TIAN Yanjun, CHEN Bo, WANG Yi, et al. Improved Power Weight Hierarchical Control Strategy for the Photovoltaic DC Boost System[J]. 2019, 45(10): 3247-3255.
DOI：

TIAN Yanjun, CHEN Bo, WANG Yi, et al. Improved Power Weight Hierarchical Control Strategy for the Photovoltaic DC Boost System[J]. 2019, 45(10): 3247-3255. DOI：

摘要

在光伏直流升压汇集系统中

当串联光伏单元光照不均时

光伏侧级联升压变流器单元输出电压不均衡会导致传统控制策略难以实现光伏出力较低光伏模块的最大功率点跟踪（maxmum power point tracking

MPPT）控制。为此

提出了基于斜率控制的权重分层控制策略

根据光伏模块间功率权重差值的变化来调整升压变流器输出侧的电压

以达到提升低输出电压模块的端口电压

使光伏模块运行在MPPT模式的要求。分析了权重分层控制策略的原理和隔离型DC/DC变换器占空比限制对MPPT控制造成的影响

并通过在MATLAB/Simulink对该策略的有效性进行验证。结果表明

所提控制策略在辐照重度不均衡时可实现功率权重较低模块的MPPT工作模式

改善了光伏系统并网出力的特性

也实现了控制模式的平滑切换。论文研究可为光伏直流升压汇集系统的控制提供参考。

Abstract

In a photovoltaic DC boosting collection system

the output voltage of the photovoltaic side cascade boost converter unit caused by the uneven illumination of the series photovoltaic unit is unbalanced

and the traditional control strategy is difficult to realize the maximum power point tracking（MPPT） control of the photovoltaic module with lower photovoltaic output. We put forward a weight hierarchical control strategy based on slope control. The output voltage of the boost converter was adjusted according to the change of the power weight difference between the photovoltaic modules to improve the port voltage of the low output voltage module to meet MPPT mode requirements. Moreover

we analyzed the principle of the weight hierarchical control strategy and the effect of isolated DC/DC converter duty cycle on MPPT control. The effectiveness of this strategy was verified by MATLAB/Simulink. The results show that

the proposed control strategy can be adopted to realize the MPPT working mode of the module with lower power weight when the irradiation is not balanced

therefore

the characteristics of the grid-connected output of the photovoltaic system can be improved

and the smooth switching of the control mode can be realized. The research of the paper can provide references for the control of photovoltaic DC boost collection system.

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