| 引用本文: | 贾祺,严干贵,李泳霖,赖柏竹.新型多端输入光伏并网系统运行控制策略[J].电力自动化设备,2017,37(10): |
| JIA Qi,YAN Gangui,LI Yonglin,LAI Baizhu.Operation control strategy of novel multi-input grid-connected PV system[J].Electric Power Automation Equipment,2017,37(10): |
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| 摘要: |
| 提出一种基于双主动全桥(DAB)变换器多光伏阵列并列输入、级联逆变输出的高频隔离型光伏并网系统。分析了DAB变换器的功率传输能力，设计了其移相控制策略；针对各输入端光伏阵列光照强度不同带来的功率不平衡问题，基于dq解耦控制数学模型，设计了级联多电平DC/AC变换器的调制量补偿控制策略，实现了各直流端电压的平衡控制。在PSCAD/EMTDC中搭建了4.5 MW/10 kV光伏并网模型进行仿真，仿真结果验证了系统结构的可行性以及所提控制策略的有效性。 |
| 关键词: 多端输入光伏并网系统 光伏阵列 DAB变换器 级联多电平DC/AC变换器 直流电压平衡 |
| DOI：10.16081/j.issn.1006-6047.2017.10.007 |
| 分类号:TM615 |
| 基金项目:国家自然科学基金资助项目(51277024) |
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| Operation control strategy of novel multi-input grid-connected PV system |
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JIA Qi1, YAN Gangui1, LI Yonglin1, LAI Baizhu2
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1.School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China;2.Hangzhou Power Supply Company of State Grid Zhejiang Electric Power Company, Hangzhou 310000, China
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| Abstract: |
| A high frequency isolated grid-connected PV system based on DAB(Dual Active Bridge) converter is proposed, with paralleled inputs and cascaded inverter outputs of multi PV arrays. The power transmission ability of DAB converter is analyzed and its phase-shifting control strategy is designed. Aiming at the power imbalance caused by different illumination intensities on the input-side of PV arrays, the modulation compensation control strategy for cascaded multi-level DC/AC converter is established based on the mathematical model of dq decoupling control, realizing the voltage balance control of DC sides. The model of a 4.5 MW/10 kV grid-connected PV system is built with PSCAD/EMTDC, whose simulative results verify the feasibility of the system structure and the effectiveness of the proposed control strategy. |
| Key words: multi-input grid-connected PV system PV array DAB converter cascaded multi-level DC/AC converter DC voltage balance |
