基于改进谐波注入的单相Boost功率因数校正变换器直流母线电容参数在线检测  

Online Detection of DC-Link Capacitance Parameters of Single-Phase Boost Power Factor Correction Converter Based on Improved Harmonic Injection

作　　者：卢伟国[1] 曹琪 张婷婷 罗天柱 张淮清[1] Lu Weiguo;Cao Qi;Zhang Tingting;Luo Tianzhu;Zhang Huaiqing(State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University,Chongqing 400044 China;China Electronics Chip Technology Research Institute,Chongqing 400060 China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学电气工程学院),重庆400044 [2]中电科芯片技术研究院,重庆400060

出　　处：《电工技术学报》2025年第8期2601-2614,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52077021)。

摘　　要：电解电容是功率变换器系统中最易失效的元件,通过实时检测其电容CR和等效串联电阻RE,明确电容退化状态对于提高系统可靠性至关重要。为此该文提出一种基于“去过零区间”的改进谐波注入电容参数在线检测方法。首先,基于母线电压谐波响应提出谐波电容电流重构方法,构建无电容电流采样的CR和RE参数计算模型。其次,高次谐波引入会带来电流过零畸变问题,直接影响了电容电流重构的准确度,提出“去过零区间”改进谐波注入方式,进一步改进电容参数检测精度。最后,搭建一台48 W/72 W/144 W的单相Boost功率因数校正(PFC)实验样机,不同工况下实验结果表明,改进谐波注入方式的检测误差控制在5%以内,所提电容参数检测法基于交直流功率平衡原理,适用于常见直流母线系统。Boost PFC converter is commonly utilized in rectifier circuits due to its ability to achieve a high power factor and low input current distortion.For the single-phase boost PFC converter,large-capacity and low-priced aluminum electrolytic capacitors(AECs)are typically employed to balance the instantaneous power deviation between the input and the output.However,the failure-prone nature of electrolytic capacitors may result in system instability or even collapse.Therefore,the real-time detection of electrolytic capacitor status information,assessment of its service life,and timely replacement of the soon-to-be-failed electrolytic capacitor can provide an important technical guarantee for the reliability of PFC power supply operation.This paper proposes an improved"zero-crossing removal interval"harmonic injection method for online detection of capacitance parameters to solve current zero-crossing distortion caused by harmonic injection.Additionally,based on the harmonic response of the bus voltage,the harmonic capacitor current reconstruction is achieved,and a model for calculating the CR and RE parameters without capacitor current sampling is constructed.Firstly,the AC and DC input-output power action characteristics of the Boost PFC converter are fully utilized,i.e.,the high harmonic current injection of the current control loop produces a high harmonic voltage splitting phenomenon on the output voltage.The two split harmonic voltage signals are employed to reconstruct the capacitor current;the capacitor's low-frequency impedance model is used to estimate CR;a mid-frequency domain harmonic capacitor parameter computation model is established to estimate the RE.In addition,the high harmonic current injection in the current loop inevitably results in an asymmetric zero-crossing distortion of the input current,directly affecting the accuracy of the capacitance parameter computation model.Consequently,the zero-crossing removal interval harmonic current injection method is employed to solve zero-crossing distortion h

关 键 词：直流母线电容 等效串联电阻RE和电容CR 改进谐波注入 在线检测 

分 类 号：TM461[电气工程—电器]