Design of LCL and LLCL filters for single-phase grid connected converters
Design of LCL and LLCL filters for single-phase grid connected converters
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DOI：
10.1049/iet-pel.2015.0922
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发表时间：
2016-07
影响因子：
2
通讯作者：
Majid Sanatkar-Chayjani;M. Monfared
中科院分区：
文献类型：
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作者：
Majid Sanatkar-Chayjani;M. Monfared
与传统的L滤波器相比，用于电压源变流器并网的高阶LCL和LLCL滤波器即使使用更小的无源元件也能提供更好的开关谐波衰减。然而，高阶滤波器的固有谐振使转换器的控制以及滤波器参数的设计变得复杂，特别是在存在数字延迟和电网阻抗变化的情况下。本研究提出了一种基于延迟的稳定转换器的 LCL 和 LLCL 滤波器的简单设计流程，该流程满足转换器电流纹波、电网电流谐波和电容器无功功率的预定义约束，同时确保简单单环电流控制对谐振的足够稳定性。此外，考虑了电网阻抗对滤波器性能和控制器稳定性的影响，因此该方法对大范围的电网阻抗变化具有鲁棒性。 3 kW 试验台在稳态和瞬态条件下的实验结果证实了所提出的滤波器设计算法的有效性。
Compared with the traditional L filters, the high order LCL and LLCL filters for grid integration of voltage source converters offer better switching harmonic attenuation even with smaller passive elements. However, the inherent resonance of the high order filters complicates the control of the converter and also the design of filter parameters, especially at presence of digital delays and grid impedance variations. This study proposes a simple design procedure for the LCL and the LLCL filters of a delay-based stabilised converter that satisfies the predefined constraints on the converter current ripple, grid current harmonics and the reactive power of the capacitor and at the same time, ensures adequate stability of the simple single loop current control against the resonance. Moreover, the effect of grid impedance on the filter performance and controller stability is taken into account, thus the proposed method is robust against a wide range of grid impedance variations. Experimental results for a 3 kW test rig under steady state and transient conditions confirm the effectiveness of the proposed filter design algorithm.