统一潮流控制器实验装置的动态SPWM方法

A Dynamic SPWM Method of UPFC Experimentation Devices

针对统一潮流控制器在逆变变换过程中所具有的直流侧电压不断波动的特点，提出了动态ＳＰＷＭ方法，以克服逆变电源的直流电压波动对ＳＰＷＭ法的逆变输出的精确性所造成的影响。动态ＳＰＷＭ方法是基于等面积原理，根据逆变电源电压的波动，动态地修正载波ｖｃ的幅值ｖｃ，使逆变输出脉冲的宽度能根据逆变电源电压的波动动态地得到调整。仿真结果证明按动态ＳＰＷＭ法进行控制得到的逆变输出结果，提高了在逆变电源电压波动情况下的逆变输出精度。

Taking account of the voltage floating of the DC side of Unified Power Flow Controller in working process, a dynamic SPWM method is proposed, to promote the accuracy of the output of the inverter. The dynamic SPWM method based on the equal area principle and dynamic changing of the amplitude V_c of carrier wave ye makes the width of the invert output pulse be adjusted with the voltage floating of the invert power source. The emulation conclusion shows that the control by the dynamic SPWM method can inprove, the accuracy of the invert output obviously when the voltage of the invert power source is floating.