论文部分内容阅读
针对含有LCL输出滤波器这类大惯性环节的并网逆变器,提供了4种比例积分(proportion-integral,PI)控制器设计方法,并进行了比较研究,以期获得最佳设计方法。通过建立基于LCL输出滤波器的并网逆变器电流环数学模型,分析了频率特性法、对称优化法、模值优化法和工程优化法的基本原理,以及计算PI参数的具体方法;并从阻尼程度和响应速度2个方面,比较了4种设计方法的特点。结果表明,综合考量响应速度和阻尼程度后,最佳设计方法是模值优化法。实验结果验证了理论分析的正确性。
For the grid-connected inverter with large inertia such as LCL output filter, four kinds of proportion-integral (PI) controller design methods are provided and compared to get the best design method. The basic principle of frequency characteristic method, symmetrical optimization method, modulo value optimization method and engineering optimization method are analyzed, and the concrete method of calculating PI parameters is analyzed by setting up mathematical model of current loop of inverter based on LCL output filter. Damping and response speed of two aspects, compared the characteristics of four kinds of design methods. The results show that, considering the response speed and damping degree, the best design method is the modulus optimization method. The experimental results verify the correctness of the theoretical analysis.