文章摘要
徐辰华,伍建松,刘斌,等.直流侧电压高二次纹波率条件下的单相逆变器谐波削弱调制[J].电力系统自动化. DOI: 10.7500/AEPS20190512006.
XU Chenhua,WU Jiansong,LIU Bin, et al.Harmonic Reduction Modulation Strategy of Single-phase Inverter with High Second-order Ripple Rate of Voltage on DC Side[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20190512006.
直流侧电压高二次纹波率条件下的单相逆变器谐波削弱调制
Harmonic Reduction Modulation Strategy of Single-phase Inverter with High Second-order Ripple Rate of Voltage on DC Side
DOI:10.7500/AEPS20190512006
关键词: 单极性调制  直流母线电压纹波  三次谐波  三阶广义积分器  双重傅里叶分析
KeyWords: unipolar modulation method  DC bus voltage ripple  third-order harmonic  third-order generalized integrator  double Fourier analysis
上网日期:2019-11-30
基金项目:国家自然科学(61863003),湖南自然科学(2018JJ3690)资助项目。
作者单位E-mail
徐辰华 广西大学电气工程学院 415476732@qq.com 
伍建松 广西大学电气工程学院 1126512941@qq.com 
刘斌 广西大学电气工程学院 bingo.liu@csu.edu.cn 
陈延明 广西大学电气工程学院 840978499@qq.com 
陆益民 广西大学电气工程学院 2590299383@qq.com 
吕智林 广西大学电气工程学院 1544773686@qq.com 
摘要:
      传统的单极性与双极性单相逆变调制方法的推演是基于直流母线电压为理想恒定直流量的前提。在实际的单相系统中,交直流功率的耦合使得单相逆变器直流母线电压含大量二倍交流电压频率的纹波分量。若采取传统逆变调制,二次纹波分量又使得交流输出侧的三次谐波含量增加,影响交流输出侧电能的质量。采用双重傅里叶变换从理论上对输出电压的谐波特性进行评估,从而提出了一种在直流侧电压高二次纹波率条件下的单相逆变器谐波削弱调制方法。利用基于三阶广义积分器的增强型锁相环提取直流母线上的二次纹波分量,并通过在逆变调制系数中注入相反二次分量的方法,达到削弱输出侧三次谐波,降低交流总谐波畸变率的目的。最后,通过实验验证了所提主动调制方法的合理性和可行性。
Abstract:
      The derivation of the traditional modulation strategy for unipolar and bipolar single-phase inverter is based on the assumption that the DC bus voltage is an ideal constant DC parameter. However, due to DC/AC power coupling, the DC bus voltage of the single-phase inverter contains a large amount of ripple component of double AC voltage frequency in the practical single-phase inverter. With the traditional modulation strategy, the second-order ripple component causes the increase of the third harmonic on the AC side, and impacts the power quality of AC output voltage. By means of the double Fourier transform method, the harmonic characteristics of output voltage is theoretically evaluated. Then, this paper proposes a harmonic reduction modulation strategy of single-phase inverter with a high rate of second-order ripple voltage on DC side. Based on the third-order general integrator, the second-order ripple components in the DC bus voltage is extracted by the enhanced phase-locked loop (PLL). By injecting the opposite second-order components into the modulation coefficient, the third harmonic and the total harmonic distortion (THD) of the output voltage have been reduced. Finally, the rationality and feasibility of the active modulation strategy are verified by experiments.
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