一种基于新型载波同相层叠PWM方法的飞跨电容型光伏发电并网技术  

Grid-connected photovoltaic power generation technology with flying capacitor inverter based on novel carrier-based disposition PWM method

作　　者：徐军[1] 王琨[2] 翟登辉[1] 冯琳[2] 李国杰[2] 

机构地区：[1]许继集团有限公司,河南许昌461000 [2]国家能源智能电网(上海)研发中心上海交通大学电气工程系,上海200240

出　　处：《电力系统保护与控制》2015年第12期134-139,共6页Power System Protection and Control

基　　金：国家自然科学基金资助项目(51307106)~~

摘　　要：针对飞跨电容型三电平光伏逆变器载波移相算法线电压谐波较高,无法灵活控制飞跨电容电压等问题,提出一种基于新型载波同相层叠PWM方法的飞跨电容型光伏发电并网方案。通过增加零电平向量分配环节,平衡飞跨电容电压,降低光伏逆变器线电压谐波。阐述了新型载波同相层叠算法基本原理,分析了该方案降低光伏逆变器线电压THD的优点。通过Matlab/Simulink数字仿真和实验样机,验证了基于新型载波同相层叠方法的飞跨电容型光伏发电并网系统能够有效跟踪最大输出功率,保证直流电压稳定,降低光伏系统输出线电压谐波。For 3-level flying capacitor photovoltaic （PV） inverter （FCPI）, carrier-based phase-shifted method has the disadvantage of high line voltage harmonics and incapable of controlling flying capacitor voltage flexibly. This paper presents a grid-connected PV power generation system using novel carrier-based disposition PWM method which can balance flying capacitor voltage manually and reduce line voltage harmonics through adding zero-level vectors. This paper presents a 3-level FCPI grid-connected power generation system with proposed method, describes the basic principles of the proposed method and analyses the advantage of reducing line voltage total harmonic distortion （THD）. Through Matlab/Simulink digital simulation and experiments, the results prove that the system has a fast response with capabilities of achieving maximum power point tracking （MPPT）, stabling DC voltage and reducing line voltage of FCPI using the proposed method.

关 键 词：载波层叠PWM方法 载波移相PWM方法 飞跨电容逆变器 电容电压平衡 光伏发电并网系统 

分 类 号：TM615[电气工程—电力系统及自动化] TM464