| 引用本文: | 陶海军,张晨杰,赵蒙恩,等.级联H桥整流器谐波分析及混合控制[J].电力系统保护与控制,2023,51(22):24-33. |
| TAO Haijun,ZHANG Chenjie,ZHAO Meng’en,et al.Harmonic analysis and hybrid control of a cascaded H-bridge rectifier[J].Power System Protection and Control,2023,51(22):24-33 |
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| 摘要: |
| 针对单相级联H桥整流器(cascaded H-bridge rectifier, CHBR)输入输出瞬时功率不平衡导致直流侧电压中含有二倍频纹波，造成网侧电流低次谐波污染的问题，提出了一种嵌入N次陷波滤波器的混合控制策略。首先根据CHBR数学模型和双闭环控制策略，分析CHBR网侧电流谐波产生的机理及推导其谐波分布规律。其次在dq旋转坐标系下的前馈解耦控制基础上，引入瞬态直接电流控制思想。然后分析了N次陷波滤波器对网侧电流谐波的抑制效果，给出N次陷波滤波器参数设计和离散方法。接着详细讨论了N次陷波器嵌入电流内环控制的设计方法，该方法有效抑制了网侧电流的3、5、7次等低次谐波，减少了PI控制器的负荷。最后，实验结果表明所提控制策略具有更小的电压超调和更短的动态响应时间，明显降低了网侧电流畸变率。 |
| 关键词: 级联H桥整流器 动态响应 二倍频纹波 混合控制 N次陷波滤波器 |
| DOI：10.19783/j.cnki.pspc.230671 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(U1804143)；河南省科技攻关项目资助(222102220014) |
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| Harmonic analysis and hybrid control of a cascaded H-bridge rectifier |
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TAO Haijun1, 2, ZHANG Chenjie1, ZHAO Meng’en1, SONG Jiayao1, ZHANG Guopeng1, 2
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1. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China;
2. Henan International Joint Laboratory of Direct Drive and Control of Intelligent Equipment, Jiaozuo 454000, China
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| Abstract: |
| There is a problem that the instantaneous power imbalance between the input and output of the single-phase cascaded H-bridge rectifier (cascaded H-bridge rectifier, CHBR) causes the DC side voltage to contain double frequency ripple, causing low-order harmonic pollution of the grid-side. Therefore a hybrid control strategy embedding an N times notch filter is proposed. First, using the CHBR mathematical model and double closed-loop control strategy, the mechanism of generation of CHBR grid side current harmonics is analyzed and its harmonic distribution rules are deduced. Second, based on the feedforward decoupling control in the dq rotating coordinate system, the idea of transient direct current control is introduced. Then the suppression effect of the N times notch filter on the grid-side current harmonics is theoretically analyzed, and N times notch filter parameter design and discrete method are given. Then the design method of N times notch filter embedded in current inner loop control is discussed in detail. This method effectively suppresses the 3rd, 5th, 7th and other low-order harmonics of the grid-side current, reducing the load of the PI controller. Finally, the experimental results show that the proposed control strategy has smaller voltage overshoot and shorter dynamic response time, and significantly reduces the grid-side current distortion rate. |
| Key words: cascaded H-bridge rectifier dynamic response double frequency ripple hybrid control N times notch filter |
