【摘要】：為了提高級(jí)聯(lián)H橋靜止無功發(fā)生器(SVG)的動(dòng)態(tài)性能和跟蹤精度,提出了一種改進(jìn)的無差拍控制方法。首先建立了級(jí)聯(lián)H橋在dq坐標(biāo)系下的數(shù)學(xué)模型和離散狀態(tài)方程,然后在傳統(tǒng)的無差拍控制算法的基礎(chǔ)上分別設(shè)計(jì)了新的狀態(tài)觀測(cè)器對(duì)電流和電壓進(jìn)行觀測(cè)。在常規(guī)離散狀態(tài)觀測(cè)器的基礎(chǔ)上,預(yù)先計(jì)算設(shè)置的中間變量,提前預(yù)測(cè)下一拍指令電流,從而減小控制延時(shí)。并采用了改進(jìn)的重復(fù)預(yù)測(cè)算法預(yù)估輸出電壓以提高電壓跟蹤精度。最后,搭建了級(jí)聯(lián)H橋SVG的MATLAB仿真模型和10 k V等級(jí)的系統(tǒng)試驗(yàn)樣機(jī),并與常規(guī)狀態(tài)觀測(cè)器算法進(jìn)行了對(duì)比仿真實(shí)驗(yàn)。結(jié)果表明:與常規(guī)狀態(tài)觀測(cè)器相比,采用所提出的改進(jìn)無差拍控制算法得到的電網(wǎng)電流總諧波失真(THD)數(shù)值從3.21%減小到1.18%;該算法在有效提高系統(tǒng)的跟蹤精度和動(dòng)態(tài)響應(yīng)速度的同時(shí),深度消除了采樣延時(shí)所帶來的跟蹤滯后問題,有效提高系統(tǒng)的無功補(bǔ)償性能。
[Abstract]:In order to improve the dynamic performance and tracking accuracy of cascaded H-bridge static Var Generator (SVG), an improved beat control method is proposed. Firstly, the mathematical model and discrete state equation of cascaded H bridge in dq coordinate system are established, and then a new state observer is designed to observe the current and voltage based on the traditional deadbeat control algorithm. Based on the conventional discrete state observer, the intermediate variables are calculated in advance, and the next instruction current is predicted in advance, thus reducing the control delay. An improved repetitive prediction algorithm is used to estimate the output voltage to improve the precision of voltage tracking. Finally, the MATLAB simulation model of cascaded H bridge SVG and the 10 kV system test prototype are built, and the simulation results are compared with the conventional state observer algorithm. The results show that, compared with the conventional state observer, The total harmonic distortion (THD) value obtained by using the improved deadbeat control algorithm is reduced from 3.21% to 1.18%. This algorithm can effectively improve the tracking accuracy and dynamic response speed of the system. The depth eliminates the tracking delay caused by the sampling delay and improves the reactive power compensation performance of the system effectively.
【作者單位】： 哈爾濱工業(yè)大學(xué)電氣工程系;黑龍江科技大學(xué)電氣與控制工程學(xué)院;
【基金】：國家自然科學(xué)基金重點(diǎn)項(xiàng)目(51237002);國家自然科學(xué)基金青年基金(51407043) 哈爾濱科技創(chuàng)新人才研究專項(xiàng)資金青年后備人才項(xiàng)目(2016RAQXJ035) 臺(tái)達(dá)電力電子科教發(fā)展計(jì)劃重大項(xiàng)目(DREM2012001);臺(tái)達(dá)電力電子科教發(fā)展計(jì)劃項(xiàng)目(DREG2014015)~~
【分類號(hào)】：TM761

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