| 楼海星，姚维.基于无差拍的光伏并网系统电流控制策略[J].轻工机械,2015,33(1): |
| 基于无差拍的光伏并网系统电流控制策略 |
| Photovoltaic Grid-Connected Current Control Strategy Based on Deadbeat Control |
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| DOI：IO. 3969/j. issn. 1005 -2895. 2015. 01. 017 |
| 中文关键词: 光伏系统 无差拍控制 电流控制策略 谐波畸变率 |
| 英文关键词:PV system deadbeat control current control strategy total harmonic distortion ( THD) |
| 基金项目: |
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| 中文摘要: |
| 针对光伏并网系统中传统双PI控制所得并网电流质量不高的缺陷，提出了电压外环采用PI调节，电流内环采
用无差拍的控制策略。阐述了无差拍控制的基本原理，并提出了预测型无差拍控制的实现方法。分析了谐波产生的主
要原因并采用数字滤波方式来提高精度。在MATLAB/Simulink中进行整个系统的仿真，仿真结果表明在理论上该控制
策略能将电流总谐波失真控制在1%以内。在样机上的实验结果表明，该控制策略能有效改善并网电流质量，达到国家
对光伏并网电流THD小于5%的要求 |
| 英文摘要: |
| Aiming at solving the problem of excessive harmonic current by the traditional double PI control strategy in the
photovoltaic grid-connected system, a strategy with PI control in voltage outer-loop and deadbeat control in current inner-
loop was proposed. The basic principle of deadbeat control was described and a method of predictive deadbeat control
was presented. The main reasons of the harmomc were analyzed and the digital filtering methods were used to improve
the accuracy. The whole system was simulated by the MATLAB/Simulink. The simulation result shows that in theory the
control strategy could control the total harmonic distortion ( THD) within l% . The experiment result on the prototype
shows the control strategy could effectively improve the quality of the grid current to reach the national standard of which
the THD is less than 5% . |
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