Adaptive Filtering Scheme for a Low-Capacitance StatCom
Adaptive Filtering Scheme for a Low-Capacitance StatCom
复制标题
低电容 StatCom 的自适应滤波方案
DOI：
10.1109/spec.2018.8635914
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
J. Pou
中科院分区：
文献类型：
--
作者：
Ezequiel Rodriguez;N. Beniwal;G. Farivar;C. Townsend;S. Vazquez;J. Pou
使用薄膜电容器来替代传统使用的电解电容器是电力电子行业中众所周知的趋势，因为它显著提高了系统的整体可靠性。由于体积和重量与电解电容器相似的薄膜电容器的电容降低，因此出现了控制挑战。为了解决这些控制挑战，以前的工作已经表明，分析滤波器具有良好的精度和快速的动态性能，可以消除低频电容器电压纹波。然而，由于这些滤波器是基于系统的理想化数学模型的，因此由于真实的系统和所利用的模型之间的差异，在滤波信号中保留了一些谐波含量，这使系统的整体性能恶化。提出了一种改进的小电容静止补偿器（LC-StatCom）自适应滤波方案。该方案减轻了外部电容电压控制回路中的时间延迟和谐波污染。因此，所提出的解决方案允许使用高带宽控制器并生成无低频谐波的电流基准。通过对一台七电平0.35 kVA单相LC-StatCom的仿真结果验证了该方法的有效性。结果表明，所提出的解决方案克服了以往的计划在时间响应和稳态操作的滤波性能方面的缺点。
The use of film capacitors to substitute traditionally utilized electrolytic capacitors is a well-known trend in the power electronics industry as it significantly increases the overall reliability of the system. Control challenges arise due to the reduced capacitance of film capacitors with similar volume and weight as electrolytic capacitors. To address these control challenges, previous works have shown the good accuracy and fast dynamic performance of analytical filters to remove low-frequency capacitor voltage ripples. However, as these filters are based on an idealized mathematical model of the system, some harmonic content remains in the filtered signal due to discrepancies between the real system and utilized model, which deteriorates the overall performance of the system. In this paper, an improved adaptive filtering scheme for a low-capacitance static compensator (LC-StatCom) is proposed. The scheme mitigates both time delays and harmonic-contamination in the outer capacitor voltage control loop. Hence, the proposed solution allows the use of a high bandwidth controller and the generation of a current reference free of low-frequency harmonics. The effectiveness of the proposed approach is validated via simulation results on a seven-level 0.35-kVA single-phase LC-StatCom. The results demonstrate that the proposed solution overcomes drawbacks of previous schemes in terms of time response and filtering performance in steady-state operation.