| 引用本文: | 钟庆,冯俊杰,王钢,李海锋.闭环控制下单相VSC低次谐波分析模型与抑制策略[J].电力自动化设备,2018,(8): |
| ZHONG Qing,FENG Junjie,WANG Gang,LI Haifeng.Low-order harmonic analysis model and mitigation strategy for SPVSC with closed-loop control[J].Electric Power Automation Equipment,2018,(8): |
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| 摘要: |
| 针对基于固定开关频率脉宽调制(PWM)闭环控制的单相电压源型换流器(SPVSC)，推导出闭环控制下开关函数的动态相量，并将SPVSC时域模型转化成动态相量谐波分析模型。在谐波分析模型的基础上，得到了SPVSC交流侧电流和直流侧电压各次谐波分量的产生机理和相互作用规律，以及控制环参数对交流侧谐波电流分量的影响。利用谐波的相互作用规律，采用在PWM中叠加低次谐波调制信号的策略，实现了交流侧谐波电流的抑制。通过仿真和实验分析，验证了所提谐波分析模型的正确性以及谐波抑制策略的有效性。 |
| 关键词: 单相电压源型换流器 谐波 闭环控制 动态相量 |
| DOI：10.16081/j.issn.1006-6047.2018.08.008 |
| 分类号:TM761 |
| 基金项目:国家自然科学基金资助项目(51307061) |
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| Low-order harmonic analysis model and mitigation strategy for SPVSC with closed-loop control |
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ZHONG Qing, FENG Junjie, WANG Gang, LI Haifeng
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School of Electric Power, South China University of Technology, Guangzhou 510640, China
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| Abstract: |
| Aiming at the SPVSC(Single-Phase Voltage Source Converter) with the closed-loop control strategy based on the fixed switching frequency PWM(Pulse Width Modulation),the dynamic phasor of switching function under closed-loop control is deduced, and the time-domain model of SPVSC is converted into the dynamic phasor harmonic analysis model. Based on the harmonic analysis model, the generation mechanism and interaction principle of the harmonic currents of different orders on SPVSC AC side and the harmonic voltages on DC side are obtained. At the same time, the influences of the control loop parameters on harmonic current of the AC side are obtained. With the interaction principles of harmonic, the harmonic current of AC side is mitigated by superimposing of low-order harmonic modulation signals in PWM. The simulative and experimental results demonstrate the correctness of the model and the effectiveness of the harmonic mitigation strategy. |
| Key words: single-phase voltage source converter harmonic closed-loop dynamic phasor |
