CAJ | 학술논문

在对逆变器PWM技术现有评价方法进行深入研究的基础上,分析了现有评价方法存在的缺陷,提出了一种基于傅立叶级数展开的数值评价方法,该方法具有参数可调整性、通用性和精确度高的特点.采用该评价方法对三电平逆变器SVPWM输出电压波形的谐波特性进行了仿真研究,对改进式SVPWM方法和传统7段对称式SVPWM方法进行了定量比较,并对中点电压偏移引起输出线电压的谐波进行了分析,给出了中点电压偏移引起的电机谐波损耗曲线.
재대역변기PWM기술현유평개방법진행심입연구적기출상,분석료현유평개방법존재적결함,제출료일충기우부립협급수전개적수치평개방법,해방법구유삼수가조정성、통용성화정학도고적특점.채용해평개방법대삼전평역변기SVPWM수출전압파형적해파특성진행료방진연구,대개진식SVPWM방법화전통7단대칭식SVPWM방법진행료정량비교,병대중점전압편이인기수출선전압적해파진행료분석,급출료중점전압편이인기적전궤해파손모곡선.
Based on in-depth study of existing inverter PWM technology evaluation methods,the shortcomings of existing methods were analyzed,and an commonly numerical analyse method based on fourier series expansion was proposed,which has adjustable parameters and high precision. This method is utilized to do simulation and research on harmonic characteristic of an improved SVPWM method of three-level inverter. Meanwhile,adopt this method,quantitative contrasts between the improved SVPWM method and traditional seven-segment symmetry SVPWM method have been done,influence curves of motor loss caused by neutral-point potential fluctuation and offset have been presented,and harmonic caused by neutral-point potential offset is analyzed.