论文标题
改进的单相网格连接电压源转换器的直流总线电压控制器可最大程度地减少总线电容和线电流谐波
Improved DC Bus Voltage Control of Single-Phase Grid-Connected Voltage Source Converters for Minimising Bus Capacitance and Line Current Harmonics
论文作者
论文摘要
瞬态性能与单相网格连接电压源转换器的直流总线电压控制的线路电流失真之间存在权衡。本文使用与一阶低通滤波器串联的比例综合控制器提出了此类转换器的DC总线电压控制方案。在调节器参数的设计中采用了扩展对称调整方法，该方法在双线频率下大大降低了振荡组件。提出的控制方法使循环带宽增加而不会扭曲线电流。因此，与常规方案相比，在阶跃载荷期间，DC总线电压波动或DC总线电容降低了。提出的电压方案被发现对网格电压变化具有鲁棒性，并且不太容易受到线路电压谐波的影响。 1.5 KVA PWM整流器的仿真和实验结果验证了所提出的方法。
There is a trade-off between transient performance and line current distortion of the DC bus voltage control of single-phase grid-connected voltage source converters. This paper presents an improved DC bus voltage control scheme of such converters using a proportional-integral controller in series with a first-order low pass filter. The extended symmetrical tuning method was adopted in the design of a regulator parameter, which greatly reduced the oscillating component at the double line frequency. The proposed control methodology allowed the loop bandwidth to increase without distorting the line current. Consequently, the DC bus voltage fluctuation or DC bus capacitance was reduced with a shorter settling time during a step load, compared with the conventional scheme. The proposed voltage scheme was found to be robust to the grid voltage variation and was less susceptible to the line voltage harmonics. Simulation and experimental results of a 1.5 kVA PWM rectifier verified the proposed methodology.
