复杂应用环境影响下光伏阵列MPPT的控制与定量评价方法研究

项目名称： 复杂应用环境影响下光伏阵列MPPT的控制与定量评价方法研究

项目编号： No.51467013

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 聂晓华

作者单位： 南昌大学

项目金额： 50万元

中文摘要： 提高最大功率点跟踪（MPPT）精度是高效光伏发电系统的关键技术与永恒追求。针对外界环境、光伏阵列和功率变换器等引发的复杂应用环境，MPPT存在难以获得准确功率曲线模型、多峰值及误跟踪等使算法失效、缺乏统一定量评价标准问题。课题采用误差理论与数据处理、随机信号分析统计、非线性系统估计和控制、群体智能优化算法等理论，分析复杂应用环境对MPPT的影响，建立基于采样数据的离散非线性状态空间模型；视MPPT控制为非线性时变系统辨识问题，提出快速的基于非线性滤波的全局MPPT控制方法，消除与抑制时变非线性功率曲线具有的测量和状态噪声、异常测量野值及多峰值等干扰；统计定位出的最大功率点协方差、Cramer-Rao下界，定量评价算法性能，并以此评价为对比对象，探讨MPPT统一定量评价方法。课题研究将克服复杂应用环境影响提高功率转换效率，为建立MPPT统一定量评价标准提供参考，具有一定的理论意义和应用前景。

中文关键词： 光伏发电；功率变换器；控制策略

英文摘要： Improving the accuracy of MPPT (Maximum Power Point Tracking) is the key technology and the eternal pursuit of high efficiency photovoltaic system. However, we didn't have real efficient algorithms and lacked united standard of quantitative evaluation for the MPPT technology applied under complex condition: the changeable external environment, caused by the Photovoltaic array and the power converter itself etc, because there are many problems of MPPT in such cases, such as difficult to obtain an accurate mathematical model of the power curve, the phenomenon of error tracking, multi-peak and so on. To deal with these problems and based on the theory of error theory and data processing, random signal analysis and statistics, nonlinear system estimation and control, swarm intelligence optimization algorithm and so on, we analyzed the influence that the complex application conditions had on MPPT and established discrete nonlinear state-space model based on sampling data; proposed the fast MPPT control method based on nonlinear filtering by viewing the MPPT control as the problem of nonlinear time-varying system identification, which could eliminate and suppress the influence of nonlinear time-varying power curve, like measurement and state noise, abnormal measurement outliers, multi-peaks and so on; evaluated the performance of the method quantitatively by counting the located covariance of the steady-state maximum power point and the Cramer-Rao lower bound, discussed the united standard of quantitative evaluation with the proposed method as a comparison object. This project could overcome the influence of complex application conditions to improve efficiency of power conversion, provide a reference for the establishment of the united standard of quantitative evaluation. This project has theoretical significance and application prospects.

英文关键词： Photovoltaic power generation;Power converter;Control trategy