Bezier函数和混合控制的光伏模拟器优化设计  

Optimal Design of Photovoltaic Emulator Based on Bezier Function and Hybrid Control

作　　者：朱显辉 刘忠武 付朕 崔世炜 ZHU Xian-hui;LIU Zhong-wu;FU Zhen;CUI Shi-wei(Heilongjiang University of Science and Technology,Harbin 150022,China)

机构地区：[1]黑龙江科技大学,电气与控制工程学院,黑龙江哈尔滨150022

出　　处：《电力电子技术》2024年第4期89-94,共6页Power Electronics

基　　金：国家自然科学基金(51677057);黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2017144)。

摘　　要：对当前光伏电池模拟器存在的误差、纹波和响应时间难以兼顾的问题,从I-U曲线建模、硬件参数优化和控制策略改进3个关键环节入手,提出了一种新的光伏电池模拟器设计方法。首先,利用两条平滑连接二阶Bezier曲线拟合光伏电池的输出特性;其次,采用正态分布配置特性曲线不同点的权重,构建了基于Buck变换器电压输出纹波和阻尼系数的多目标函数,借助粒子群算法求解出整个电压域内电感和电容的优化结果;再次,设计了以最大功率点为分界点的电压和电流混合控制策略。最后,搭建了硬件试验平台。结果表明,所设计的光伏模拟器响应时间小于7 ms,电压和电流的误差均不超过1.7%,有效地兼顾了精度与响应时间,减少了输出电压纹波。A new design method for photovoltaic cell emulator is proposed based on the three key links of I-U curve modeling,hardware parameter optimization,and control strategy improvement,which address the issues of error,ripple,and response time that are difficult to balance in current photovoltaic cell emulator.Firstly,two smoothly connected second-order Bezier curves are used to fit the output characteristics of photovoltaic cells.Secondly,a multi-objective function based on the voltage output ripple and damping coefficient of the Buck converter is constructed by configuring the weights of different points on the characteristic curve using a normal distribution.The particle swarm optimization algorithm is used to solve the optimization results of inductance and capacitance in the entire voltage domain.Once again,a voltage and current hybrid control strategy is designed with the maximum power point as the boundary point.Finally,a hardware testing platform is established.The results show that the response time of the designed photovoltaic emulator is less than 7 ms,and the errors of voltage and current are not more than 1.7%,effectively balancing accuracy and response time,and reducing output voltage ripple.

关 键 词：光伏电池模拟器 BUCK变换器 粒子群算法 

分 类 号：TM615[电气工程—电力系统及自动化]