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。
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.
出处
《电力自动化设备》
EI
CSCD
北大核心
2014年第10期64-68,共5页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51077017)~~
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
MPPT
current sensor
grid-connection
electric inverters
photovoltaic
electric power generation
control
