High Performance PWM Generator of DVR using EDLC

摘要

Relates to a high-function PWM scheme during operation of the inverter: (Dynamic Voltage Restorer DVR) the invention is the instantaneous voltage drop compensating device, a dynamic voltage to compensate it when the instantaneous voltage drop or a voltage dip in the power system occurs.; The present invention is an instantaneous voltage drop dynamic voltage compensation device (the "DVR" hereinafter) as the drive operation when DC link stage with the feedback measuring the ripple voltage therefore use the triangular wave generation technique that a weight to the ripple DC link stage of the ripple voltage, It was given to compensate for the resulting average value of the inverter output voltage even when the DC link voltage variation of the stage generated has the advantage of being possible to supply a stable output voltage.; DVR is full voltage and UPS On-Line to adopt a compensation scheme: to compensate for fluctuations in the voltage delivered when the instantaneous voltage drop of the grid voltage dip, unlike (UPS Uninterruptible Power Supply). Application of the DVR is advantageous in terms of cost and efficiency than the UPS because it takes up several elements of instantaneous voltage drop over a 80 [%] of the overall problem caused the system related to power quality.; The DVR electricity through lead storage delivered as an energy storage device, there is compensation of the voltage variation of using a capacitor, etc., DVR system using a lead-acid battery is DVR system using a capacitor electrolyte, and a problem in the charge-discharge rate and service life and environmental aspects but has the disadvantage that the energy density of the electric double layer capacitor is very low: it was possible to overcome the problem of the emergence of (EDLC electric Double Layer Capacitor).; In the present invention devised a charge and discharge rate, life and environment, the conventional UPS or a lead acid battery or deliver high performance PWM inverter technique of a DVR applied systems favorable than DVR system EDLC capacitors is applied at an energy density surface. In order to achieve this, we ensure that the DVR is driving at a high efficiency by presenting a (Pulse Width Modulation) Double-carrier PWM methods, in particular to control such that for a double-carrier modulation indexing and voltage of the inverter DC Link stage minimizes the compensation error of the voltage change It was.; The invention is expected to be widely applied to a high performance operation of the inverter power quality compensating apparatus for supplying a stable, high-quality power to the country of the power suyongga that promote the transition to a high value-added industry that require high power quality.