摘要
针对双级式光伏并网发电前级变换器系统功率电压双闭环MPPT结构的控制器参数设计问题,基于前级变换器系统的等效电路,采用状态空间平均法建立了系统的非线性模型,进而采用平衡点附近线性化方法得到其线性模型。根据对象特性引入控制器结构,在频率特性和根轨迹分析的基础上,给出了前级控制器参数的系统化设计方法。12 k W双级式光伏并网发电系统仿真结果表明,在标准光强和模拟自然条件光强变化时,该控制器能快速实现前级MPPT跟踪控制及单位功率因数并网控制,获得了良好的动静态性能。
In order to solve the problem of systematic controller parameter design method of the front stage converter system with power-voltage double closed-loops for a double-stage grid-connected PV power generation system, the state-space averaging method is employed to establish the nonlinear model of the system based on its equivalent circuit, and then the linearization method close to equilibrium point is used to obtain its linear model. The controller structure is added according to the plant characteristics, and the systematic parameter design method for front stage controller is given by both frequency response and root locus analysis. Finally, the simulation model for a double-stage gridconnected PV power generation system of 12 k W is built up, and the simulation results show that in the cases of standard illumination and natural illumination changes, the controller proposed in this paper can not only realize maximum power tracking control and grid-connected unity power factor control quickly, but also get a good static and dynamic performance.
出处
《可再生能源》
CAS
北大核心
2016年第3期360-367,共8页
Renewable Energy Resources
基金
内蒙古自治区高等学校科学研究项目(NJZY077)
内蒙古工业大学风能太阳能利用技术省部共建教育部重点实验室开放基金项目(201401)
关键词
双级式并网变换器
建模
状态空间平均法
参数设计
double-stage grid-connected converter
modeling
state-space averaging method
parameter design
