电工技术学报  2022, Vol. 37 Issue (20): 5188-5200    DOI: 10.19595/j.cnki.1000-6753.tces.212064
电力系统与综合能源 |
直流微电网储能系统的NF+QPR+LPF双闭环2次谐波电流抑制方法
徐卿瀚, 蒙显辉, 杨苓, 叶美婷, 何江伦
广东工业大学自动化学院 广州 510006
NF+QPR+LPF Dual-Loop Secondary Harmonic Current Suppression Method for Energy Storage System in DC Microgrid
Xu Qinghan, Meng Xianhui, Yang Ling, Ye Meiting, He Jianglun
School of Automation Guangdong University of Technology Guangzhou 510006 China
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摘要 直流微电网中储能系统直流侧的电感电流含有2次谐波分量,将会增大变换器中开关管的电流应力和通态损耗。该文首先通过分析得到,传统的双闭环控制方法对2次谐波电流的抑制效果不明显,且使得系统在负载跳变时的动态特性变差。针对这两个问题,提出一种引入陷波器(NF)、准比例谐振器(QPR)及负载功率前馈(LPF)的双闭环控制方法,在不降低电压调节器的幅频增益以及不改变等效阻抗的频率适应性的条件下,该方法可以增加直流侧电感支路的等效阻抗在2倍输出频率处的幅值,对2次谐波电流有很好的抑制效果,同时使得直流侧电感支路等效阻抗在2倍输出频率外的幅值降低,改善了系统的抗负载突变能力。最后,通过实验验证了所提控制方法的有效性。
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徐卿瀚
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关键词 直流微电网储能系统2次谐波电流陷波器准比例谐振器负载功率前馈    
Abstract:The current on inductive branch on the DC side of the energy storage system in the DC microgrid contains a secondary harmonic component, which will increase the current stress and through-state loss of the switching tube in the converter. The traditional dual-loop control method shows that the secondary harmonic current is not suppressed obviously and the dynamic characteristics of the system is inferior during load hopping. Aiming at these two problems, a control method of introducing notch filter (NF), quasi-proportional resonator (QPR) and load power feedforward (LPF) based on dual-loop control is proposed. The method increases the amplitude of the equivalent impedance of the DC-side inductance branch at twice the output frequency without reducing the amplitude-frequency gain of the voltage regulator or changing the frequency adaptability of the equivalent impedance, and has a excellent suppression effect of the second harmonic current. Meanwhile, the equivalent impedance of the DC side inductance branch outside the double output frequency amplitude is reduced under this control method, which improves the system's ability to resist sudden changes in load. Finally, the experimental results demonstrate the effectiveness of the proposed control method.
Key wordsDC microgrid    energy storage system    secondary harmonic current    notch filter    quasi-proportional resonator    load power feedforward   
收稿日期: 2021-12-21     
PACS: TM46  
基金资助:国家自然科学基金(52107185)和广东省基础与应用基础研究基金(2019A1515110768)资助项目
通讯作者: 杨 苓 女,1992年生,讲师,博士研究生,研究方向为可再生能源发电及其电能质量控制技术、并网变换器建模与稳定性分析。E-mail: 1650148795@qq.com   
作者简介: 徐卿瀚 男,2001年生,本科,研究方向为直流微电网运行与控制。E-mail: 1425962791@qq.com
引用本文:   
徐卿瀚, 蒙显辉, 杨苓, 叶美婷, 何江伦. 直流微电网储能系统的NF+QPR+LPF双闭环2次谐波电流抑制方法[J]. 电工技术学报, 2022, 37(20): 5188-5200. Xu Qinghan, Meng Xianhui, Yang Ling, Ye Meiting, He Jianglun. NF+QPR+LPF Dual-Loop Secondary Harmonic Current Suppression Method for Energy Storage System in DC Microgrid. Transactions of China Electrotechnical Society, 2022, 37(20): 5188-5200.
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