【摘要】：數(shù)字控制可靠性高、控制靈活,但存在數(shù)字延時(shí),改變了系統(tǒng)穩(wěn)定性。在考慮計(jì)算、采樣等數(shù)字延時(shí)情況下,采用直接數(shù)字法,建立LCL型并網(wǎng)逆變器離散精確數(shù)學(xué)模型,在連續(xù)域和離散域下,對(duì)網(wǎng)側(cè)電流單環(huán)控制穩(wěn)定性進(jìn)行對(duì)比分析,說(shuō)明數(shù)字延時(shí)改變對(duì)系統(tǒng)穩(wěn)定性的影響,基于此在網(wǎng)側(cè)電流單環(huán)反饋控制中設(shè)置數(shù)字延時(shí)為滯后一拍,主要分析滯后一拍情況下采樣頻率和諧振頻率之比對(duì)穩(wěn)定性的影響,得出其穩(wěn)定的范圍,同時(shí)對(duì)控制器參數(shù)進(jìn)行了設(shè)計(jì)。仿真和實(shí)驗(yàn)證明了所提方法的正確性和有效性。
[Abstract]:Digital control has high reliability and flexible control, but digital delay changes the stability of the system. The discrete precise mathematical model of LCL grid-connected inverter is established by using direct digital method in the case of digital delay such as calculation and sampling. The stability of single-loop control of grid-side current in continuous domain and discrete domain is compared and analyzed. The effect of digital delay on the stability of the system is explained. Based on this, the digital delay is set as one beat behind in the single loop feedback control of the current on the grid side. The influence of sampling frequency and resonance frequency on the stability of the system is mainly analyzed in the case of one beat of delay. The stable range is obtained and the controller parameters are designed. Simulation and experiments show that the proposed method is correct and effective.
【作者單位】： 湘潭大學(xué)控制研究所;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51577162) 湖南省自然科學(xué)基金資助項(xiàng)目(14JJ5007)~~
【分類號(hào)】：TM464

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

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本文編號(hào)：2280473