文章摘要
欧朱建,王广柱.基于模块化多电平变换器的单相低频输电方法[J].电力系统自动化,2018,42(21):111-118. DOI: 10.7500/AEPS20171030018.
OU Zhujian,WANG Guangzhu.A Single-phase Low Frequency AC Transmission Method Based on Modular Multilevel Converter[J].Automation of Electric Power Systems,2018,42(21):111-118. DOI: 10.7500/AEPS20171030018.
基于模块化多电平变换器的单相低频输电方法
A Single-phase Low Frequency AC Transmission Method Based on Modular Multilevel Converter
DOI:10.7500/AEPS20171030018
关键词: 单相低频输电  功率波动  模块化多电平变换器  拟方波  电容电压纹波
KeyWords: single-phase low frequency AC(SLFAC)transmission  power ripple  modular multilevel converter  quasi-square wave  capacitor voltage ripple
上网日期:2018-08-13
基金项目:国家自然科学基金资助项目(51541708)
作者单位E-mail
欧朱建 电网智能化调度与控制教育部重点实验室(山东大学), 山东省济南市 250061  
王广柱 电网智能化调度与控制教育部重点实验室(山东大学), 山东省济南市 250061 sdwgz@sdu.edu.cn 
摘要:
      基于全桥模块的模块化多电平变换器(FMMC)提出了一种单相低频(SLFAC)输电方法。一种拟方波波形作为低频侧电压波形的提出,不仅可以解除对低频侧输电频率的限制,实现1 Hz甚至更低频率的输电,而且可以减小低频侧功率波动和电缆的充电电流,使SLFAC的输电能力与高压直流(HVDC)输电相近。从技术经济性角度对SLFAC,HVDC及三相低频(LFAC)输电进行对比分析。提出了适用于FMMC-SLFAC的功率平衡策略,在保证系统有功平衡的前提下,实现低频侧功率波动全部由FMMC中电容吸收,不流入工频侧。推导了由低频侧功率波动引发的电容电压波动,并在电容电压波动限幅范围内,给出了低频侧电压切换时长表达式。给出了综合控制策略,通过仿真验证了FMMC-SLFAC的有效性和可行性。
Abstract:
      A single-phase low frequency AC(SLFAC)transmission method is proposed based on full-bridge modular multilevel converter(FMMC). A quasi-square voltage waveform is generated for low frequency side(LFS), which can not only lift the restriction on the frequency of LFS and realize the power transmission with the frequency of 1 Hz or even lower, but also minimize power ripple on LFS and eliminate charging currents of transmission cables. Besides, it is proved that the transmission capacity of SLFAC can be increased close to that of HVDC. Comparisons have been done among LFAC and HVDC, SLFAC in aspects of technology and economy. A power balancing strategy is proposed to adapt to the FMMC-SLFAC system. Under the premise of ensuring the balance for system active power, power ripples of LFS are absorbed by capacitors of FMMC and do not inject into power frequency side. Furthermore, the voltage ripple of capacitors caused by the power ripple of LFS is derived in formula, and the period of switching sine wave is given in formula under the restriction of capacitor voltage ripple. Finally, a comprehensive control strategy is presented and the simulation results verify the feasibility and effectiveness of FMMC-SLFAC.
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