| 引用本文: | 王盼宝,王 卫,吴 炎.光伏发电系统中无电流传感器型MPPT控制策略[J].电力自动化设备,2014,34(10): |
| WANG Panbao,WANG Wei,WU Yan.Strategy of MPPT control without current sensors for photovoltaic system[J].Electric Power Automation Equipment,2014,34(10): |
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| 摘要: |
| 依据双级式光伏并网逆变器前后级解耦控制的特点，提出一种无电流传感器型最大功率点跟踪（MPPT）控制策略。利用双级式光伏并网逆变器前后级功率平衡原理，通过从后级逆变环节获取的并网电流给定值作为前级DC-DC环节的MPPT判断条件，进而采用扰动观察法完成MPPT。对该MPPT控制策略的原理进行了分析。设计了一台800 W双级式光伏并网逆变器实验样机，并记录了实验波形和MPPT情况。实验结果显示，在系统运行功率大于300 W时，MPPT效率大于99.2 % 且响应速度良好，验证了该无电流传感器型MPPT控制策略的可行性和有效性。 |
| 关键词: 最大功率点跟踪 电流传感器 并网 逆变器 光伏 发电 控制 |
| DOI： |
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| 基金项目:基金项目：国家自然科学基金资助项目（51077017） |
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| Strategy of MPPT control without current sensors for photovoltaic system |
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WANG Panbao, WANG Wei, WU Yan
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School of Electrical Engineering and Automation，Harbin Institute of Technology，Harbin 150001，China
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| Abstract: |
| As the control of two-stage photovoltaic grid-connected inverter is decoupled between two stages，a strategy of MPPT（Maximum Power Point Tracking） control without current sensors is proposed. According to the power balance principle，the grid-connecting current acquired in the second stage can be used as the MPPT criterion of the first stage（DC-DC section）. The perturbation and observation method is then applied to realize the MPPT. The proposed MPPT control strategy is analyzed in principle. An 800 W prototype of two-stage photovoltaic grid-connected inverter is designed，and the experimental waveforms and MPPT data are recorded，which show that，when the operating power of system is bigger than 300 W，the MPPT efficiency is higher than 99.2% and the tracking response is perfect，verifying the feasibility and effectiveness of the proposed control strategy. |
| Key words: MPPT current sensor grid-connection electric inverters photovoltaic electric power generation control |
