多电平单元串联电压源型变频器高压电源瞬时失电连续运行研究

高压变频调速系统现场应用复杂，工艺多样。在重要的大型工业系统中，高压电源系统有双备用，紧急互投等功能，当变频器对大功率的电机供电时，如果高压电源进行切换，将出现0．1S～1．5s左右的失电间隔，要求变频器在失电间隔中能正常工作，且转速波动较小，达到系统在失电期间不出现剧烈振荡。对于多电平单元串联电压源型变频器，当通过对功率单元电容值的加大，PWM输出占空比减小的方法提高失电连续运行性能，其效果均不理想。在经过大量论证后，采用特殊的DSP控制逻辑，并利用旋转系统中的飞轮动能转换，取得实现变频器在高压瞬时失电时保持稳定运行。

Continuous Operating Research on High Voltage Power Supply''''s Instan-taneous Voltage Disconnection of Multi-level Unit Series Connected Volt- age Source Inverter

High voltage frequency inverter system application is complexity on work place, diversiform manipulative technique. In important large industry system, high voltage power source system is provided with two standby and peremptorily mutual switch much capability. Then frequency inverter equipment supply high power electromotor energy source, if high voltage energy source come forth mutual switch, that engender zero point one to one point five second of electric source disappear litter, need frequency inverter equipment can normally work time slot, moreover speed fluctuate less, achieve system not acutely surge betwixt electric source disappear of time. Toward frequency inverter equipment of voltage source of cell mid series of multi-level voltage, can pass toward increase capacitance element capability of power cell, PWM output minis take/leisure scale of method boost-but outcome all not perfect. Pass much demonstrate course, that applications especial DSP Boolean calculation, also being flywheel kinetic energy conversion by turning system., can carry out frequency inverter equipment persistence stably operate in time of high voltage source disappear.