带有源缓冲的单级单相电流型逆变器

为了实现单级升压逆变,提出了一种带有源缓冲的单级单相电流型PWM逆变器,及其状态量限定下的输出电压反馈复合单周期控制策略,并对构成这种逆变器的电路拓扑、控制策略、关键电路参数设计、系统建模和仿真等进行了深入分析和研究,获得了重要结论。该逆变器电路拓扑主要由储能电感、有源缓冲电路、电流型单相逆变桥构成,存在三种工作模式和四种电路模态,通过三种工作模式的灵活切换达到限定储能电感电流和缓冲电容电压等状态量的目的,通过前馈储能电感电流和反馈输出电压的复合单周期控制实现输出正弦电压的稳定。1 kVA 100 V DC/220 V 50 Hz AC逆变器的原理实验结果表明,所提出逆变器能实现单级升压逆变,具有输出电压波形质量高、负载适应能力强和动态性能好的优点。

Single-stage single-phase current inverter with source buffer

In order to realize the single-stage boost inverter,a single-stage single-phase current mode PWM inverter with source buffer was proposed,and its output voltage feedback compound single-cycle control strategy under the state quantity limit was proposed.The circuit topology,control strategy,key circuit parameter design,system modeling and simulation of the inverter were analyzed and studied,and some important conclusions were obtained.The inverter circuit topology is mainly composed of the energy storage inductor,the active buffer circuit and the current type single-phase inverter bridge.There are three operating modes and four circuit modes.The purpose of limiting the state quantity of energy storage inductor current and buffer capacitor voltage can be achieved by flexibly switching three working modes.The output sinusoidal voltage was stabilized by compound single period control of feedforward energy storage inductor current and feedback output voltage.The experimental results of 1 kVA 100 V DC/220 V 50 Hz AC inverter show that the proposed inverter can realize single-stage boost inverter,and has the advantages of high quality output voltage waveform,strong load adaptability and good dynamic performance.