摘要
电压源换流器高压直流输电(VSC-HVDC)是基于电压源换流器技术的新一代直流输电技术。该文介绍了模块化多电平电压源换流器的拓扑结构和工作原理。针对模块化多电平换流器(MMC)的电容电压平衡问题,提出了一种有效的电容电压平衡控制策略,保证个子模块电容电压处于相同的范围之内;并针对MMC-HVDC系统,采用载波移相调制策略。最后通过仿真软件PSCAD/EMTDC对上述策略进行了验证,仿真结果验证了策略的可行性。
Voltage Source Converter HVDC（VSC-HVDC） is a new generation of direct current transmission technology.The article introduces the topologies and the basic principles of MMC-HVDC.Aiming at the critical problem about capacitor voltage balance of each sub module,a feasible voltage scheme which could effectively ensure each sub module at the same capacitance is shown.A carrier phase shifting modulation strategy is used for the system of MMC-HVDC.Finally based on PSCAD/EMTDC,the strategies above are verified.
出处
《电气技术》
2011年第8期5-9,共5页
Electrical Engineering
基金
华北电力大学科研基金资助项目(200812002)
