CAJ | 학술논문

作为新一代直流输电技术,基于电压源换流器型直流输电由于采用全控电力电子器件,能够灵活实现有功功率和无功功率的独立控制,动态补偿交流母线无功功率进而实现交流电压控制,因此在新能源并网和交流电网互联等方面越来越显示出其独特的优势.而换流器作为直流输电系统中的核心部件,其不同的拓扑结构和调制方式会对换流器的输出性能带有一定的影响.以ABB 公司和Siemens公司所提出的拓扑结构为例,对比分析了电压源换流器型直流输电两电平和模块化多电平的拓扑结构以及优缺点,并通过仿真分析了载波移相和最近电平逼近调制策略对输出电压电流波形的影响以及 ABB 公司 CTL 拓扑结构在环流抑制上的优越特性.
작위신일대직류수전기술,기우전압원환류기형직류수전유우채용전공전력전자기건,능구령활실현유공공솔화무공공솔적독립공제,동태보상교류모선무공공솔진이실현교류전압공제,인차재신능원병망화교류전망호련등방면월래월현시출기독특적우세.이환류기작위직류수전계통중적핵심부건,기불동적탁복결구화조제방식회대환류기적수출성능대유일정적영향.이ABB 공사화Siemens공사소제출적탁복결구위례,대비분석료전압원환류기형직류수전량전평화모괴화다전평적탁복결구이급우결점,병통과방진분석료재파이상화최근전평핍근조제책략대수출전압전류파형적영향이급 ABB 공사 CTL 탁복결구재배류억제상적우월특성.
As a new generation of HVDC power transmission technology adopting full controlled power electronic devices, in the voltage source converter (VSC) based HVDC power transmission system, the active and reactive power can be controlled independently and flexibly and the reactive power of AC bus can be dynamically compensated and then the AC voltage control can be implemented, therefore the VSC-HVDC power transmission shows its unique advantages in grid connection of new power sources and interconnection of AC power grids. As the core devices in VSC-HVDC transmission system, different topological structures and modulation modes of converters greatly influence the output performance of inverters. Taking topological structures given by ABB and Siemens for example, the comparative analysis on topological structures of two-level VSC and modular multilevel converter (MMC) as well as their advantages and disadvantages are performed. The influences of carrier phase-shifting pulse width modulation (PSPWM) and nearest level modulation on current waveform and the advantageous property of CTL topology structure developed by ABB in circulating current restraining are analyzed by simulation.