本文選題：數(shù)字控制 + 數(shù)字延時��； 參考：《電力系統(tǒng)自動化》2017年18期

【摘要】：LCL型并網(wǎng)逆變器數(shù)字控制中延時環(huán)節(jié)對系統(tǒng)穩(wěn)定性的影響不可忽略。分析發(fā)現(xiàn),網(wǎng)側(cè)電流數(shù)字單環(huán)魯棒性不足,需要采用額外的有源阻尼方法增強阻尼,但傳統(tǒng)的數(shù)字電容電流反饋有源阻尼方法帶來了內(nèi)環(huán)數(shù)字延時,使電容電流內(nèi)環(huán)等效虛擬電阻不再保持純電阻特性,增大了系統(tǒng)保持穩(wěn)定的難度,因此提出一種預(yù)測占空比結(jié)合零極點補償控制延時的方法。通過預(yù)測控制算法得到占空比和增加零極點,有效地補償了系統(tǒng)數(shù)字延時,消除了采樣計算等產(chǎn)生的一拍延時和零階保持器產(chǎn)生的半拍延時,使系統(tǒng)在有源阻尼方法下能有效地起到增強阻尼的作用。算法設(shè)計簡單,系統(tǒng)穩(wěn)定性加強。仿真和實驗驗證了所提方法的有效性和可行性。
[Abstract]:The effect of delay on system stability in digital control of LCL grid-connected inverter can not be ignored. It is found that the robustness of the grid-side current digital single loop is insufficient, and the additional active damping method is needed to enhance the damping. However, the traditional digital capacitive current feedback active damping method brings the digital delay of the inner loop. The equivalent virtual resistance of the capacitor current inner loop is no longer pure resistance, which makes it more difficult to maintain the stability of the system. Therefore, a method of predictive duty cycle combined with zero pole compensation control delay is proposed. By using predictive control algorithm to obtain duty cycle and increase zero pole, the digital delay of the system is compensated effectively, and the beat delay caused by sampling calculation and the half-beat delay produced by zero order holdout are eliminated. The system can effectively enhance the damping under the active damping method. The algorithm is simple and the stability of the system is enhanced. The effectiveness and feasibility of the proposed method are verified by simulation and experiments.
【作者單位】： 湘潭大學(xué)信息工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51577162) 湖南省自然科學(xué)基金資助項目(14JJ5007) 湖南省教育廳重點科研項目(17A129)~~
【分類號】：TM464
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本文編號：1919166