CONTROLLING SYSTEM OF SINGLE-PHASE ACTIVE POWER FILTERAPF USING ROTATING REFERENCE FRAMES AND MEHTOD THEREOF

摘要

discloses a control system and method of the single-phase active power filter using the rotated coordinate system in the present invention. According to the invention, through the Citibank (CT) which is mounted to the input power to the nonlinear load detecting a single-phase current, and induces a current in the virtual using the delay characteristics of the low pass filter (Low Pass Filter) from the single-phase current, the two-phase current and using the synchronous rotary coordinate system having the distortion power on frequency load current (i _L ) and a detector for detecting a harmonic current command for the corresponding compensation; Compensation current command value (i _ref ) corresponding to the compensation current of the inverter output current by receiving (i _C ) and the compensation current command value (i _ref ) a hysteresis current controller for the current correction in the reference value is to occur by mutual comparison; And is made in response to the current correction of the hysteresis current controller as the gate driver for driving controlling the amount of current supplied to the non-linear load, ; Harmonic detector at this time, the actual current phase of the current ( ) of the phase as much as the delay of the first low-pass filter (LPF ); Virtual current provided through the first low-pass filter (LPF) ( ) and the actual current () is d-axis when rotating at a speed component current () and q-axis current component ( normal component coordinate conversion unit for calculating the ); The normal component coordinate d-axis current component calculated from the conversion unit ( ) and the q-axis current component () of the DC component to extract only for the second low-pass filter (LPF); Virtual current provided through the first low-pass filter (LPF) ( ) and the actual current ( ) is - speed of rotation to be when the d-axis current component () and q-axis current component () reversed-phase component conversion section for calculating the coordinates; d-axis current component calculated from the component coordinate reverse conversion unit ( ) and the q-axis current component ( ) for extracting only the direct current component of the third low-pass filter (LPF); And d-axis current component of the direct current component is extracted through the second low-pass filter (LPF) ( ) in the third low-pass filter (LPF) which is extracted through the direct current component of the d-axis current component ( img file="112003050204626-pat00018.tif" he = "11" id = "18 "img-format =" tif "wi =" 13 "by subtracting /) d-axis current component () calculated, and the second low-pass filter (LPF) q-axis current component (of a direct current component is extracted through a) and the third low-pass filter (LPF) via extraction is a direct current component in the q-axis current component () q-axis current component (the sum of) to the output, the d-axis and q-axis current component ( , ) for the actual current axis () in the compensation current command value by performing an inverse transformation for (i _ref ) is constituted by an inversion that generates, ; as presenting a control algorithm for a method of single-phase active power filter of harmonic reduction caused by the single-phase non-linear load, in the traditional method there is required a minimum half a period of time to detect a harmonic by using the phase of the virtual for example, to use the three-can make the coordinate system provides an effect that the instantaneous calculation is possible. ; In addition, the actual load current of a given time delay generate a phase and a size different currents, unlike the conventional way to make an image of the virtual using the delay characteristics of the low-pass filter, and the phase rotation for the other two current after detecting the fundamental wave current using a coordinate system, by removing the fundamental wave component in the load current can obtain the compensation current command value that includes only harmonic components provides an effect capable of real-time control.