基于MMC的同相供电变流器研究
发布时间：2018-07-20 10:05
【摘要】：电气化铁道供电系统中存在谐波、无功和负序等问题,相邻供电区间电分相装置的存在导致列车运行速度低,主断路器频繁分断,影响牵引主电路的安全运行。采用新型同相供电变流器实现列车同相供电,可以使上述问题得到很好解决。与现有的同相供电变流器相比,采用MMC同相供电变流器可以省去一个变压器,提高系统效率,减小体积,降低成本。本论文将模块化多电平变流器(MMC)技术应用于同相供电变流器,对相关关键技术开展研究。研究了单相MMC。分析比较了传统多电平变换器的类型和优缺点,详细论述了单相MMC的拓扑结构及工作原理,建立了单相MMC的数学模型,结合载波移相技术(CPS-SPWM)的调制策略,运用子模块直流电容的均压控制策略对直流母线电压稳压,保证MMC的正常工作。研究了MMC同相供电变流器。分析了同相牵引供电系统的基本结构和工作原理,在此基础上创新性地将MMC结构运用在综合潮流补偿器(IPFC)中,并探讨了相应的指令电流检测算法。针对5MVA容量的同相供电变流器进行设计和仿真。对该变流器的主电路器件进行参数计算和选型,在MATLAB/simulink平台中搭建模型进行不同工况下的仿真实验,最后结合同相供电系统设计了一个主从式结构的MMC控制器系统。通过MATLAB/simulink的仿真实验,验证了CPS-SPWM调制策略和子模块稳压控制策略的正确性,基于MMC的同相供电变流器在不同工况条件下均能正常进行有功传递、无功补偿和谐波抑制,达到对电气化铁道供电的电能质量进行综合治理的目的。
[Abstract]:There are some problems in electrified railway power supply system, such as harmonic, reactive power and negative sequence. The existence of electric phase separation device in adjacent power supply area leads to low train speed and frequent break-down of main circuit breaker, which affects the safe operation of main traction circuit. The problem mentioned above can be solved well by using a new type of in-phase power converter to realize the in-phase power supply of the train. Compared with the existing in-phase power supply converter, the MMC in-phase power converter can save a transformer, improve the system efficiency, reduce the volume and reduce the cost. In this paper, the modularized multilevel converter (MMC) technology is applied to the in-phase power supply converter, and the related key technologies are studied. Single phase MMC was studied. This paper analyzes and compares the types, advantages and disadvantages of traditional multilevel converters, discusses the topology and working principle of single-phase MMC in detail, establishes the mathematical model of single-phase MMC, and combines the modulation strategy of carrier phase-shifting technique (CPS-SPWM). The DC bus voltage is stabilized by the voltage equalizing control strategy of the DC capacitor of the submodule to ensure the normal operation of the MMC. The MMC in phase power converter is studied. The basic structure and working principle of the in-phase traction power supply system are analyzed. On this basis, the MMC structure is creatively applied to the integrated power flow compensator (IPFC), and the corresponding instruction current detection algorithm is discussed. The design and simulation of 5 MVA power supply converter are carried out. The main circuit components of the converter are calculated and selected, and a model is built in MATLAB / Simulink platform to carry out simulation experiments under different working conditions. Finally, a master-slave structure MMC controller system is designed combined with the in-phase power supply system. The correctness of CPS-SPWM modulation strategy and submodule voltage stabilization control strategy is verified by the simulation experiment of MATLAB / Simulink. Active power transfer, reactive power compensation and harmonic suppression can be normally carried out in the in-phase power converter based on MMC under different working conditions. To achieve the purpose of comprehensive treatment of power quality of electrified railway power supply.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U224
本文编号：2133188
[Abstract]:There are some problems in electrified railway power supply system, such as harmonic, reactive power and negative sequence. The existence of electric phase separation device in adjacent power supply area leads to low train speed and frequent break-down of main circuit breaker, which affects the safe operation of main traction circuit. The problem mentioned above can be solved well by using a new type of in-phase power converter to realize the in-phase power supply of the train. Compared with the existing in-phase power supply converter, the MMC in-phase power converter can save a transformer, improve the system efficiency, reduce the volume and reduce the cost. In this paper, the modularized multilevel converter (MMC) technology is applied to the in-phase power supply converter, and the related key technologies are studied. Single phase MMC was studied. This paper analyzes and compares the types, advantages and disadvantages of traditional multilevel converters, discusses the topology and working principle of single-phase MMC in detail, establishes the mathematical model of single-phase MMC, and combines the modulation strategy of carrier phase-shifting technique (CPS-SPWM). The DC bus voltage is stabilized by the voltage equalizing control strategy of the DC capacitor of the submodule to ensure the normal operation of the MMC. The MMC in phase power converter is studied. The basic structure and working principle of the in-phase traction power supply system are analyzed. On this basis, the MMC structure is creatively applied to the integrated power flow compensator (IPFC), and the corresponding instruction current detection algorithm is discussed. The design and simulation of 5 MVA power supply converter are carried out. The main circuit components of the converter are calculated and selected, and a model is built in MATLAB / Simulink platform to carry out simulation experiments under different working conditions. Finally, a master-slave structure MMC controller system is designed combined with the in-phase power supply system. The correctness of CPS-SPWM modulation strategy and submodule voltage stabilization control strategy is verified by the simulation experiment of MATLAB / Simulink. Active power transfer, reactive power compensation and harmonic suppression can be normally carried out in the in-phase power converter based on MMC under different working conditions. To achieve the purpose of comprehensive treatment of power quality of electrified railway power supply.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U224
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