摘要
文章对两级单相光伏逆变器元件及控制策略进行优化配置,提出一种光伏逆变器无直流电压传感器控制策略。该控制策略利用逆变器中直流链电压与正弦脉宽调制信号,电压与占空比的对应关系,把传统控制中需要测量和直接控制的电量,通过控制器产生的中间信号来进行间接控制,既消除测量采样电路窜入的电磁干扰又不增加计算量,在确保实现光伏电源最大功率发电和电能逆变功能基础上降低了建设成本。最后在MATLAB下仿真,仿真结果证明所提控制策略的正确性与可行性。
In this paper, the allocation of PV inverter components and their control strategies were op- timized, and it proposed a novel dc voltage sensorless control strategy for PV generation system. The proposed method is realized by reconstructing the de-link voltage and PV power respectively through the relationships between de-link voltage and the amplitude of sinusoidal modulation signal, PV volt- age and the duty cycle of the front boost converter in PV inverter. Then the real values of de-link voltage and PV power can be indirect controlled according to regulate the estimated values, it is no longer need to measure de-link voltage and PV voltage directly by dc voltage sensors which assumed in traditional grid-connected two-stage single-phase PV generation system. All dc voltage sensors are eliminated while not downgrade the system performance with regard to the MPPT accuracy and ac output quality. MATLAB simulations verified the proposed control strategy.
出处
《可再生能源》
CAS
北大核心
2013年第8期18-21,27,共5页
Renewable Energy Resources
基金
湖北省自然科学基金重点项目(2012FFA084)
湖北省自然科学基金项目(2012FFB03703)
湖北国智恒三大电力科技有限公司研究生科研创新基金
