单级单相无电解电容Buck-Boost逆变器  

A Single-Stage Single-Phase Buck-Boost Inverter without Electrolytic Capacitor

作　　者：王立乔[1] 陈建医 程超然 曹立志 Wang Liqiao;Chen Jianyi;Cheng Chaoran;Cao Lizhi(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province Yanshan University,Qinhuangdao 066004 China)

机构地区：[1]燕山大学电力电子节能与传动控制河北省重点实验室,秦皇岛066004

出　　处：《电工技术学报》2023年第24期6768-6781,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51677162);河北省自然科学基金(E2017203235)资助项目。

摘　　要：该文给出一种无电解电容的单级单相Buck-Boost逆变器。该逆变器可以灵活地实现升降压以适应宽输入范围的直流侧电压;仅用一个工作于正负半周的低值直流储能电感而无需电解电容和大电感,开关器件和无源器件数目少,因而降低了成本和体积,提高了可靠性、使用寿命和功率密度;通过改变储能电感电流方向实现极性反转,控制方式十分简洁,非常适用于中小功率光伏系统。该文详述了Buck-Boost逆变器的工作原理、升降压能力及调制策略,并在此基础上,完成该逆变器升降压、扰动以及并网控制的仿真和实验,结果良好且与理论分析相契合。The existing single-stage,single-phase non-isolated inverters need to solve the following problems:buck and boost voltage capability,electrolytic capacitors,single-supply inputs,the number of topology devices,device multiplexing rate,and the overall simplicity of topology and control,while most of the existing solutions can not take into account all problems.This paper proposes a simple and compact inverter.Its topology can meet the requirements of the Buck-Boost voltage without electrolytic capacitors.It only needs a low-value inductor as an energy storage component,and fewer power and passive devices.The proposed inverter is lightweight,has a high device reuse rate,and has simple working and control modes,suitable for small and medium-power photovoltaic power generation systems.The circuit consists of 6 IGBT switches(S1~S6,S3,and S4 with inverse resistance IGBT,the others are bidirectional IGBTs),1 DC inductor,1 AC filter capacitor,1 AC filter inductor,and a single DC input power supply(photovoltaic panel).The output side is connected to the load or merged into the grid.After consulting a large number of domestic and foreign literature,it is found that the inverter proposed in this paper has superiority in structure.This paper provides a theoretical analysis of the circuit.The circuit has six operating modes when the energy storage inductor Ldc current is interrupted.The operating modesⅠ,Ⅱ,andⅤare positive half-cycles,andⅢ,Ⅳ,andⅥare negative half-cycles.Due to the special structure of the H-bridge front on the input power side,unipolar SPWM modulation is used,in which S3,S4,S5,and S6 power frequencies work,and S1 and S2 semi-high frequencies work.In this paper,the inverter has a good Buck-Boost capability,and the voltage gain is related to the duty cycle,DC inductance,and switching frequency.The maximum voltage stress of switches S1,S2,S5,and S6 is Uin+Uo,the maximum voltage stress of switches S3 and S4 is Uo,and the maximum current stress of all switches is Im.The parameters of the energy storage i

关 键 词：电力电子 无电解电容 单级单相非隔离 BUCK-BOOST 光伏逆变器 

分 类 号：TM464[电气工程—电器]