| 引用本文: | 刘瑞煌,杨景刚,吴丹,姚金杰,张宸宇,袁宇波.光伏直流变压器不闭锁零电压穿越策略[J].电力自动化设备,2023,43(3): |
| LIU Ruihuang,YANG Jinggang,WU Dan,YAO Jinjie,ZHANG Chenyu,YUAN Yubo.Photovoltaic DC transformer with non-blocking zero voltage ride through strategy[J].Electric Power Automation Equipment,2023,43(3): |
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| 摘要: |
| 针对中压直流系统双极故障下光伏直流变压器的低电压穿越问题，首先基于双有源桥和全桥隔离电路的子模块拓扑结构，分析光伏直流变压器正常运行时最大功率点追踪控制的快速实现方案。然后利用光伏电池板输出特性，提出光伏直流变压器不闭锁穿越策略，该策略对故障时长不敏感，可实现严重故障下的零电压穿越。进一步，针对故障穿越暂态过程中的过电压及子模块不均压问题，提出多控制策略间的平滑切换方案，有效降低暂态过程中的过电压现象，改善子模块间的均压效果。最后在MATLAB/Simulink环境中搭建仿真模型，验证所提策略的有效性。 |
| 关键词: 光伏 直流变压器 零电压穿越 不闭锁 平滑切换 |
| DOI：10.16081/j.epae.202208027 |
| 分类号:TM615;TM41 |
| 基金项目:国家重点研发计划项目(2018YFB0904700) |
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| Photovoltaic DC transformer with non-blocking zero voltage ride through strategy |
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LIU Ruihuang1, YANG Jinggang1,2, WU Dan3, YAO Jinjie2, ZHANG Chenyu1, YUAN Yubo1
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1.Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103, China;2.School of Electrical Engineering, Southeast University, Nanjing 210096, China;3.NARI Technology Co.,Ltd.,Nanjing 211106, China
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| Abstract: |
| Aiming at the low voltage ride through problem of photovoltaic direct current transformer(DCT) under bipolar fault of medium voltage direct current(MVDC) system, based on the topology structure of submodule with dual active bridge and full bridge isolated circuit, the fast implementation scheme of maximum power point tracking control during normal operation of photovoltaic DCT is analyzed. Then, based on the output characteristics of photovoltaic panels, a DCT non-blocking ride through strategy is proposed, which is insensitive to the fault duration and can realize zero voltage ride through under severe faults. Furthermore, aiming at the problem of the overvoltage and submodule voltage imbalance in the transient process of fault ride through, a smooth switching scheme among multiple control strategies is proposed to reduce the overvoltage during the transient process and improve the voltage balance effect among submodules. Finally, a simulation model is built in MATLAB/Simulink platform to verify the effectiveness of the proposed strategy. |
| Key words: photovoltaic DC transformer zero voltage ride through non-blocking smooth switching |
