适用于构网型新能源发电系统的MCSPWM多电平逆变器  

MCSPWM Multilevel Inverter for Grid-forming New Energy Generation System

作　　者：殷小东 余佶成 刘俊杰 梁思远 刘俭 王健 YIN Xiaodong;YU Jicheng;LIU Junjie;LIANG Siyuan;LIU Jian;WANG Jian(China Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]中国电力科学研究院有限公司,武汉430074

出　　处：《高电压技术》2024年第2期861-869,I0031,I0032,共11页High Voltage Engineering

基　　金：国家重点研发计划(2022YFB2403800)。

摘　　要：构网型新能源发电系统具备系统惯量支持和电压支撑的优势,可利用各种能源之间的互补性,提高能源利用率及系统稳定性。在该系统中,多电平逆变器发挥着重要作用。为此,提出一种新型的开关电容九电平逆变器及基于高频的多重载波正弦脉宽调制(multi-carrier sinusoidal pulse width modulation,MCSPWM)策略,该逆变器在开关数量、管压应力、升压能力和控制难度等方面具有优良的综合性能。该文分析了该逆变器的工作原理和抑制电容充电电流尖峰的方法,在软硬件设计的基础上,成功研制了新型开关电容九电平逆变器实验样机。样机实验结果证明,所提出的拓扑在高频调制策略下具有输出2倍升压、双向功率流的能力,开关电容可自动均压,开关管电压应力不超过输入直流源电压Uin,并且开关电容纹波电压的峰峰值小于2V。新型开关电容九电平逆变器,在构网型新能源发电系统中具有潜在的应用前景。Grid-forming new energy generation system has the merits of system inertia and voltage support,which im-proves energy usage and system stabilization by using the complementation of all kinds of energy.In this system,multilevel inverters play an important role.In this paper,a novel switched capacitor 9-level inverter was proposed,with high-frequency multi-carrier sinusoidal pulse width modulation(MCSPWM)strategy,which owns comprehensively good performances of switches amount,voltage stress of power switches,boosting ability,and control difficulty.The operation principle and the suppression method of capacitor charging current was analyzed.The prototype of switched capacitor 9-level inverter was developed based on the design.Experimental results verify that,under the high-frequency modulation strategy,the presented inverter has double output voltages and bi-directional power flow.Automatic voltage balance of the switched capacitors is achieved.Voltage stress of the power switches is limited to the input voltage Uin,and ripple voltage peak value of the switching capacitors is less than 2 V.The proposed switched capacitor 9-level inverter has a good appli-cation prospect in grid-forming new energy generation system.

关 键 词：开关电容九电平逆变器 多重载波正弦脉宽调制 高频调制 构网型新能源发电系统 工作模态 预充电电路 

分 类 号：TM464[电气工程—电器]