摘要
提出一种新型单级非隔离Buck-Boost逆变器。为使输入电压与调制波之间呈线性关系,采用一种新型的非线性PWM策略。该逆变器具有平衡的升降压能力,适用于光伏系统等输入电压宽范围波动的场合;此外该逆变器所用开关器件较少,仅需一个感值较小的电感作为储能元件,无需电解电容,并具有体积小、成本低、效率高、短路及断路保护简单等优点。首先对该逆变器的工作原理进行分析,确定其调制策略,然后建立其数学模型,设计闭环调节器,最后进行仿真和实验验证。通过分析仿真和实验结果,表明该逆变器具有升降压能力,适用于输入电压宽范围变化的场合。
A new single-stage non-isolated Buck-Boost inverter is proposed. To make the linear relationship between the input voltage and the modulation wave,a novel nonlinear PWM strategy is adopted. This inverter has a balanced buck-boost capability,which is suitable for applications where the input voltage of the photovoltaic system fluctuates widely. In addition,this inverter uses fewer switching devices. Only one inductor with a small inductance is needed as the energy storage component and does not need electrolytic capacitors,which has the advantages of small volume,low cost,high efficiency,short circuit and simple circuit protection. First,analyze the working principle of the inverter, determine its modulation strategy,then establish its mathematical model,design a closedloop regulator,and finally perform simulation and experimental verification. Through the analysis of simulation and experimental results,it is shown that the inverter has buck-boost capability and is suitable for occasions where the input voltage varies widely.
作者
王立乔
刘乐
李占一
Wang Liqiao;Liu Le;Li Zhanyi(Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province,Yanshan University,Qinhuangdao 066004,China;State Grid Shijiazhuang Power Supply Company,Shijiazhuang 050000,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第3期338-346,共9页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51677162)
河北省自然科学基金(E201703235)。
