本文選題：高壓直流輸電 + 模塊化多電平換流器　； 參考：《中國電機工程學報》2017年05期

【摘要】：模塊化多電平換流器(modular multilevel converter,MMC)應用于柔性高壓直流輸電(voltage sourced converter based high voltage direct current,VSC-HVDC)系統(tǒng)時,具有功率模塊數(shù)量多、橋臂電流大等特性,導致?lián)Q流閥開關損耗高、開關器件散熱困難。傳統(tǒng)排序均壓算法功率模塊投切為隨機過程,開關頻率很高,難以滿足實際工程需求。首先分析MMC功率模塊的充放電規(guī)律,分析功率模塊投切對電容電壓均衡控制的影響機理;在此基礎上,推導傳統(tǒng)電壓排序均壓算法的開關頻率上下限解析式。對現(xiàn)有的一種固定功率模塊輪換數(shù)的低開關頻率均壓算法,分析開關頻率和均壓效果的優(yōu)缺點。然后,通過推導功率模塊輪換數(shù)與均壓特性的關系式,提出一種改進的低開關頻率均壓策略。該策略在開關頻率下限解析式的基礎上,通過閉環(huán)控制每個控制周期功率模塊輪換個數(shù),實現(xiàn)MMC均壓特性和開關頻率的優(yōu)化控制。最后,利用±350 k V 1000MW MMC-HVDC系統(tǒng)實時硬件在環(huán)(real-time hrdware in the loop,HIL)仿真測試系統(tǒng),對兩種低開關頻率均壓策略進行對比驗證。
[Abstract]:The modular multilevel converter / converter (Modular multilevel converters) is used in the flexible HVDC / voltage sourced converter based high voltage direct current VSC-HVDCC system, which has the characteristics of large number of power modules and high current of the bridge arm, which results in high switching loss of the converter valve and difficulty in the heat dissipation of the switching device. The power module of the traditional equalization algorithm is a random process, and the switching frequency is very high, so it is difficult to meet the practical engineering requirements. Firstly, the charge-discharge rule of MMC power module is analyzed, and the influence mechanism of power module switching on capacitor voltage equalization control is analyzed. On this basis, the analytical formula of switching frequency upper and lower limits of traditional voltage sorting and voltage equalizing algorithm is derived. The advantages and disadvantages of switching frequency and voltage equalizing effect are analyzed for a low switching frequency equalizing algorithm with fixed power module rotation number. Then, by deducing the relationship between the rotation number of power modules and the voltage sharing characteristics, an improved low switching frequency voltage sharing strategy is proposed. Based on the analytical formula of the lower limit of switching frequency, the optimal control of MMC voltage sharing and switching frequency is realized by controlling the rotation number of power modules in each control cycle in closed loop. Finally, two low switching frequency voltage-sharing strategies are compared and verified by using 鹵350kV 1000MW MMC-HVDC system real-time hrdware in the loopHILs.
【作者單位】： 電力電子與電氣驅(qū)動重點實驗室(中國科學院電工研究所);
【基金】：國家自然科學基金項目(51541706)~~
【分類號】：TM721.1;TM46

【參考文獻】

相關期刊論文 前2條

1 湯廣福;羅湘;魏曉光;;多端直流輸電與直流電網(wǎng)技術(shù)[J];中國電機工程學報;2013年10期

2 屠卿瑞;徐政;鄭翔;張靜;;一種優(yōu)化的模塊化多電平換流器電壓均衡控制方法[J];電工技術(shù)學報;2011年05期

【共引文獻】

相關期刊論文 前10條

1 王永平;趙文強;楊建明;汪楠楠;盧宇;李海英;;混合直流輸電技術(shù)及發(fā)展分析[J];電力系統(tǒng)自動化;2017年07期

2 王新穎;湯廣福;魏曉光;馬春艷;高陽;肖湘寧;;適用于直流電網(wǎng)的LCL諧振式模塊化多電平DC/DC變換器[J];電網(wǎng)技術(shù);2017年04期

3 張帆;許建中;趙成勇;黃瑩;趙曉斌;辛清明;;模塊化多電平換流器分極控制策略[J];電力系統(tǒng)自動化;2017年06期

4 徐云飛;肖湘寧;孫雅e，

本文編號：1849412