YTPQC-SVG/AHF Active Harmonic Filter and Static Var Generator
Active Harmonic Filters(AHF) are new generation harmonic filters which use modern technologies and devices to provide revolutionary filtering solution.The Active filter is IGBT based harmonics generator. The active harmonic filter is connected in parallel to the load to be compensated.
Static Var Generator(SVG) is IGBT (Integrated Gate Bipolar Transistor) based Technology combined with our advanced Digital Signal Processer (DSP) .
YTPQC-SVG detects load current through external Current Transformers and analyse reactive power Kvar of load current by our advanced & efficient DSP controller, then control IGBT inverter to generate reactive power kvar to compensate the load reactive power demand to meet target Power Factor .
IGBT drive protection For SVG and AHF
IGBT insulated gate bipolar transistor is a composite fully controlled voltage-driven power semiconductor device composed of bipolar triode and insulated gate field effect transistor. It has both the high input impedance of MOSFET and the low on-voltage drop of GTR. In terms of advantages, the driving power is small and the saturation voltage is reduced, which is very suitable for application in converter systems with a DC voltage of 600V and above, such as AC motors, frequency converters, switching power supplies, lighting circuits, traction drives and other fields. The gate circuit of the existing IGBT drive protection has a protection blind area. Generally, the on-time ton of a high-power IGBT is about 1us. In fact, the tail voltage drops slowly when the IGBT is turned on. Therefore, it is urgent to design a gate circuit for IGBT drive protection to solve the above problems.
The utility model patent provides a gate circuit for IGBT drive protection; it includes an optocoupler 6N137, a drive module EXB481 and a timer NE555P; the No. 1 pin of the drive module EXB481 is electrically connected with an insulated gate bipolar transistor VIG, And the No. 1 pin of the drive module EXB481 is electrically connected to the collector of the insulated gate bipolar transistor VIG, and the No. 3 pin of the drive module EXB481 is electrically connected to a resistor Rg, and the resistor Rg is far away from one end of the drive module EXB481. It is electrically connected to the base of the insulated gate bipolar transistor VIG, the No. 6 pin of the driver module EXB481 is connected in series with a diode VD1 and a Zener diode VZ3, and one end of the Zener diode VZ3 away from the diode VD1 is electrically connected to the driver module EXB481 On the emitter of the driver module EXB841, the utility model replaces the ultra-fast recovery diode VD1 of pin No. 6 of the drive module with an ultra-fast recovery diode with a larger conduction voltage drop or a Zener diode in reverse series, thereby preventing the IGBT from being too narrow. Wide low output and high power consumption state to avoid blind spots.
75A Active Harmonic Filter,30/50kVAr Static Var Generator
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