基于半桥子模块结构的模块化多电平换流阀损耗特性分析
发布时间：2018-10-15 13:14
【摘要】：模块化多电平换流阀拓扑结构是目前最受关注的柔直换流阀拓扑,目前对于其半桥结构的均压环流等控制方法已经有大量系统的研究,但是都没有针对该控制方式对于损耗的影响进行进一步分析,关于换流阀损耗的分析又都仅局限于特定工作模式下换流阀总损耗率的计算,缺乏对子模块损耗一致性的研究。本文在研究MMC拓扑结构、调制技术和控制方法的基础上,分析了MMC损耗计算方法及不同控制方法下的半桥子模块各器件损耗特性以及损耗一致性问题。首先介绍了MMC换流阀的基本工作原理。研究了MMC换流阀的损耗构成,分析了损耗计算方法。采用PLECS仿真软件对MMC换流阀损耗进行计算,结合算例对损耗计算方法的准确性进行了对比验证。其次针对半桥子模块结构分析了NLC调制方式下子模块损耗特性。包括使用限值法和保持因子法这两种排序方法时子模块的损耗特性；使用环流控制抑制器法(CCSC)和三相解耦二次谐波环流抑制算法(TPD)这两种环流抑制策略时子模块的损耗特性；子模块电容容值变化时子模块的损耗特性；改进NLC调制方式,使其输出2N+1电平时子模块的损耗特性。与NLC类似,针对半桥子模块结构分析了CPS-SPWM调制方式下子模块损耗特性。包括使用能量均衡法和排序法这两种均压方法时子模块的损耗特性；使用环流控制抑制器(CCSC)法和三相解耦二次谐波环流抑制算法(TPD)这两种环流抑制策略时子模块的损耗特性。论文最后比较了上述两种调制方式在不同交流侧功率因数下子模块损耗特性以及子模块之间的温度分布特性。
[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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM721.1
本文编号：2272662
[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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM721.1
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