并网逆变器输出LCL滤波器的优化设计

具有优越滤波性能、易于集成和封装的LCL滤波器在分布式并网发电系统中的应用日益广泛,然而零阻尼引起的谐振问题不仅影响闭环控制系统的稳定性,而且导致入网电流性能降低。如何设计和优化滤波参数来提升LCL滤波器的滤波性能成为研究的热点。在滤波总电感和滤波电容满足系统性能的条件下,比较分析了电感分布系数和阻尼电阻对系统的稳定性、滤波效果、开关次谐波衰减比、阻尼值及阻尼损耗的影响,并在此基础上,给出了电感分布系数和阻尼电阻优化方法一般设计流程。仿真结果表明该优化方法是有效的。

Optimization Design of Output LCL Filter for Inverter Connected-Grid

The LCL filter owned superior filter performance , integrated and encapsulated easily, becoming more and more widely used in the distributed generation system connected-grid,However the zero damping occurred by resonance not only affects the stability of the closed-loop system,but also decreases the performance of net current.So how to design and optimize the filter parameters to improve the filter performance of the filter becomes the hot spot of the research.Under the conditions that the total inductance and the capacitance can meet the filter performances,the paper analyzes comparatively how the inductance distribution coefficient and damping resistance impact the stability of the system, filtering effect,Switch order harmonic attenuation ratio,damping value and the damping loss.On this basis, proposed an optimization method, and given the general design flow chart.The simulation results show the effectiveness of the optimization method of this paper.