| 引用本文: | 姜一鸣,姚俊涛,刘 飞,等.考虑电网频率偏差的并网逆变器多内模重复控制[J].电力系统保护与控制,2016,44(21):144-149. |
| JIANG Yiming,YAO Juntao,LIU Fei,et al.A multi-internal-model repetitive control for grid-connected inverter considering grid-frequency deviation[J].Power System Protection and Control,2016,44(21):144-149 |
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| 摘要: |
| 在并网逆变器的应用中，基于内模原理的重复控制，延时时长通常按照电网的标称频率设计。当电网频率偏离标称频率时，重复控制的高增益频段将偏离并网电流的基波和谐波频率，造成控制器的稳态精度下降，为此，提出一种多内模重复控制，并联接入考虑电网频率偏差的辅助重复控制支路。分析多内模重复控制的频率特性，并根据其稳定边界设计辅助重复控制支路的权重系数。仿真结果表明，与按照标称频率设计的传统重复控制相比，所提出的多内模重复控制在标称频率时具有基本相同的稳态精度，在频率偏差时能够提高稳态精度，从而提高并网电流的质量。 |
| 关键词: 重复控制 频率偏差 并网逆变器 电流控制 |
| DOI：10.7667/PSPC151922 |
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| A multi-internal-model repetitive control for grid-connected inverter considering grid-frequency deviation |
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JIANG Yiming,YAO Juntao,LIU Fei,SUN Jianjun,ZHA Xiaoming
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(School of Electrical Engineering, Wuhan University, Wuhan 430072, China)
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| Abstract: |
| Applied in the grid-connected inverter, the internal-model based repetitive control usually features that the delay time is designed according to the nominal grid-frequency. When the grid-frequency deviates, the high-gain pass-bands of the conventional repetitive control will deviate the frequencies of actual fundamental and harmonic currents. Consequently the steady accuracy will degrade. This paper proposes a multi-internal-model repetitive control, with ancillary repetitive control loops considering the deviation of grid-frequency parallel embedded. The weight coefficients for the ancillary loops are designed based on the stability analysis of the multi-internal-model repetitive control in frequency domain. From the simulation results, compared with the conventional repetitive control, the proposed control features an equal steady accuracy in the nominal grid-frequency and a developed steady accuracy when grid-frequency deviates, and consequently an improved quality of the current into grid. |
| Key words: repetitive control frequency deviation grid-connected inverter current control |
