| 引用本文: | 甄新梅,贺宇阳,于大川,等.基于光储协调电压自均衡的光伏直流汇集方案研究[J].电力系统保护与控制,2025,53(10):153-164. |
| ZHEN Xinmei,HE Yuyang,YU Dachuan,et al.A photovoltaic DC collection scheme based on PV-storage coordinated voltage self-balancing[J].Power System Protection and Control,2025,53(10):153-164 |
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| 摘要: |
| 光伏直流汇集系统具备效率高、成本低以及稳定性好等优势。其中，多端口、模块化的直流汇集系统有可控性强和便于升压的特点。然而，各发电单元间的功率失配易导致模块输出电压失衡，制约了发电效率与系统稳定性。为此，提出一种基于光储协调电压自均衡技术的两级升压式直流汇集方案。首先，基于异构子模块混合，构建了输入独立输出串联(input-independent-output-series, IIOS)型光伏直流汇集系统结构。在保障各模块输出电压自均衡的前提下，实现了独立光伏单元的升压汇集。其次，IIOS经隔离型MMC直流变换器实现二级升压，降低了各级升压需求。最后，在Matlab/Simulink环境下搭建仿真模型。仿真结果表明，所提光伏直流汇集方案可靠性好、效率高，在发电单元功率严重失配的情况下也能保证优异的发电效率和系统稳定性。 |
| 关键词: 光伏直流汇集 DC-DC变换器 电压自平衡 光储协调 隔离型MMC |
| DOI：10.19783/j.cnki.pspc.240963 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(62103218) |
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| A photovoltaic DC collection scheme based on PV-storage coordinated voltage self-balancing |
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ZHEN Xinmei1, HE Yuyang2, YU Dachuan1, YU Fei1
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1. College of Automation and Electronic Engineering, Qingdao University of Science & Technology,
Qingdao 266061, China; 2. Gaotang County Power Supply Company, State Grid
Shandong Electric Power Company, Gaotang 252800, China
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| Abstract: |
| Photovoltaic (PV) DC collection systems offer advantages such as high efficiency, low-cost, and good stability. The multi-port, modular DC collection systems have strong controllability and ease of voltage boosting. However, power mismatches among the power generation units often lead to module output voltage imbalances, thereby restricting generation efficiency and system stability. To address this issue, a two-stage boost DC collection scheme is proposed based on PV-storage coordinated voltage self-balancing technology. First, an input-independent-output-series (IIOS) PV DC collection system is constructed based on heterogeneous sub-module integration. This system achieves voltage boosting and collection of independent PV units while ensuring output voltage self-balancing among modules. Then, a second-stage boost is realized using an isolated MMC DC-DC converter, reducing the boosting requirement at each stage. Finally, a simulation model is built in the Matlab/Simulink environment. Simulation results show that the proposed PV DC collection scheme exhibits high reliability and efficiency, maintaining excellent power generation performance and system stability even under severe power mismatches among generation units. |
| Key words: photovoltaic DC collection DC-DC converter voltage self-balancing PV-storage coordination isolated MMC |
