【摘要】：模塊化多電平換流閥拓?fù)浣Y(jié)構(gòu)是目前最受關(guān)注的柔直換流閥拓?fù)?目前對(duì)于其半橋結(jié)構(gòu)的均壓環(huán)流等控制方法已經(jīng)有大量系統(tǒng)的研究,但是都沒有針對(duì)該控制方式對(duì)于損耗的影響進(jìn)行進(jìn)一步分析,關(guān)于換流閥損耗的分析又都僅局限于特定工作模式下?lián)Q流閥總損耗率的計(jì)算,缺乏對(duì)子模塊損耗一致性的研究。本文在研究MMC拓?fù)浣Y(jié)構(gòu)、調(diào)制技術(shù)和控制方法的基礎(chǔ)上,分析了MMC損耗計(jì)算方法及不同控制方法下的半橋子模塊各器件損耗特性以及損耗一致性問題。首先介紹了MMC換流閥的基本工作原理。研究了MMC換流閥的損耗構(gòu)成,分析了損耗計(jì)算方法。采用PLECS仿真軟件對(duì)MMC換流閥損耗進(jìn)行計(jì)算,結(jié)合算例對(duì)損耗計(jì)算方法的準(zhǔn)確性進(jìn)行了對(duì)比驗(yàn)證。其次針對(duì)半橋子模塊結(jié)構(gòu)分析了NLC調(diào)制方式下子模塊損耗特性。包括使用限值法和保持因子法這兩種排序方法時(shí)子模塊的損耗特性；使用環(huán)流控制抑制器法(CCSC)和三相解耦二次諧波環(huán)流抑制算法(TPD)這兩種環(huán)流抑制策略時(shí)子模塊的損耗特性；子模塊電容容值變化時(shí)子模塊的損耗特性；改進(jìn)NLC調(diào)制方式,使其輸出2N+1電平時(shí)子模塊的損耗特性。與NLC類似,針對(duì)半橋子模塊結(jié)構(gòu)分析了CPS-SPWM調(diào)制方式下子模塊損耗特性。包括使用能量均衡法和排序法這兩種均壓方法時(shí)子模塊的損耗特性；使用環(huán)流控制抑制器(CCSC)法和三相解耦二次諧波環(huán)流抑制算法(TPD)這兩種環(huán)流抑制策略時(shí)子模塊的損耗特性。論文最后比較了上述兩種調(diào)制方式在不同交流側(cè)功率因數(shù)下子模塊損耗特性以及子模塊之間的溫度分布特性。
[Abstract]:Modularized multilevel converter valve topology is the most concerned topology of flexible and straight converter valve. However, no further analysis has been made on the effect of the control mode on the loss, and the analysis on the loss of the converter valve is limited to the calculation of the total loss rate of the converter valve under the specific working mode, and the research on the consistency of the submodule loss is lacking. Based on the study of MMC topology, modulation techniques and control methods, this paper analyzes the loss characteristics and loss consistency of each device of the half-bridge sub-module under different control methods and the calculation methods of MMC loss. Firstly, the basic working principle of MMC converter valve is introduced. The loss composition of MMC converter valve is studied and the loss calculation method is analyzed. The PLECS simulation software is used to calculate the loss of the MMC converter valve, and the accuracy of the loss calculation method is compared with an example. Secondly, the loss characteristics of the submodule of NLC modulation are analyzed for the half-bridge sub-module structure. The loss characteristics of sub-modules are analyzed by using the limiting method and the holding factor method, and the loss characteristics of the sub-modules using the circulation control suppressor method (CCSC) and the three-phase decoupled second-harmonic current suppression algorithm (TPD). The loss characteristics of the submodule when the capacitance capacity of the submodule changes, and the loss characteristics of the submodule output 2N1 electrical submodule by improving the NLC modulation mode. Similar to NLC, the submodule loss characteristics of CPS-SPWM modulation mode are analyzed for the half-bridge sub-module structure. The loss characteristics of sub-modules are discussed in this paper, including the energy equalization method and the sorting method, and the loss characteristics of the sub-modules using the circulation control suppressor (CCSC) and the three-phase decoupled second-harmonic current suppression algorithm (TPD). Finally, the loss characteristics and temperature distribution characteristics of the two modulation modes in different AC power factor submodules are compared.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM721.1

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本文編號(hào)：2272662