發(fā)布時(shí)間：2018-06-26 04:52

  本文選題：模塊化多電平變流器 + 梯形波　； 參考：《高電壓技術(shù)》2017年01期

【摘要】：模塊化多電平變流器(MMC)在高壓大功率直流領(lǐng)域得到了廣泛的認(rèn)可和應(yīng)用,同時(shí)高頻化能夠減小設(shè)備的重量和體積,對(duì)MMC變流器橋臂參考電壓為中高頻梯形波時(shí)的模塊電容電壓均壓策略進(jìn)行分析。首先分析了梯形參考波的選取和應(yīng)用場(chǎng)合。其次,針對(duì)梯形波提出一種模塊電容電壓均壓策略:在橋臂電壓上升和下降階段采取預(yù)先排序的方式,減少了一個(gè)基波周期內(nèi)的開(kāi)通關(guān)斷次數(shù),同時(shí)降低了控制硬件的要求。另外,針對(duì)橋臂之間模塊電壓不均衡的情況,對(duì)橋臂參考電壓平頂期進(jìn)行修正,在上下橋臂之間建立通信,根據(jù)上下橋臂模塊電容電壓平均值的大小決定橋臂參考電壓平頂期的實(shí)際導(dǎo)通個(gè)數(shù)。此外,根據(jù)梯形波和變換器的特點(diǎn),分析了抑制諧波的策略。最后在PSIM中對(duì)所提出的方法進(jìn)行建模仿真,結(jié)果表明:橋臂之間和橋臂內(nèi)部的模塊電容電壓實(shí)現(xiàn)了均壓,與傳統(tǒng)的正弦波的調(diào)制方法相比,開(kāi)關(guān)頻率大大減小,且回路中3次諧波和5次諧波電流分量幾乎為0。
[Abstract]:Modular multilevel converters (MMC) have been widely recognized and applied in the field of high voltage and high power DC. At the same time, high frequency can reduce the weight and volume of equipment. The voltage equalizing strategy of the module capacitor voltage is analyzed when the reference voltage of the bridge arm of MMC converter is medium and high frequency trapezoidal wave. Firstly, the selection and application of trapezoidal reference wave are analyzed. Secondly, a voltage equalizing strategy of module capacitor voltage is proposed for trapezoidal wave. In the stage of rising and falling of bridge arm voltage, the method of pre-ranking is adopted, which reduces the turn-off times in a fundamental wave cycle and reduces the requirement of control hardware at the same time. In addition, the reference voltage flattening period of the bridge arm is corrected to establish the communication between the upper and lower arms. According to the average capacitance voltage of the upper and lower arm modules, the actual number of the bridge arm reference voltage flattening period is determined. In addition, according to the characteristics of trapezoidal wave and converter, the harmonic suppression strategy is analyzed. Finally, the proposed method is modeled and simulated in PSIM. The results show that the module capacitance voltage between and inside the bridge arm achieves voltage equalization, and compared with the traditional sine wave modulation method, the switching frequency is greatly reduced. The third and fifth harmonic current components in the loop are almost zero.
【作者單位】： 中國(guó)科學(xué)院電工研究所大功率電力電子與直線驅(qū)動(dòng)技術(shù)研究部;中國(guó)科學(xué)院大學(xué);國(guó)網(wǎng)北京市電力公司;
【基金】：國(guó)家電網(wǎng)公司總部科技項(xiàng)目(52020116000D)~~
【分類號(hào)】：TM46

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 鄒國(guó)平;姚暉;何文林;孫翔;吳尊東;汪衛(wèi)國(guó);;溪洛渡—浙西±800kV特高壓直流輸電工程受端電網(wǎng)直流偏磁治理[J];高電壓技術(shù);2016年02期

2 徐政;肖晃慶;張哲任;;模塊化多電平換流器主回路參數(shù)設(shè)計(jì)[J];高電壓技術(shù);2015年08期

3 馬為民;吳方R，

本文編號(hào)：2069186