ABB PQFA Instruction Manual
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Contents
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PQFA Instructions ManualAsea Brown Boveri Jumet S.A. 14The PWM inverter is composed of DC capacitors and an IGBT inverter bridge.This system is able to generate any voltage waveform with PWM technology.The physical layout of a PWM inverter module is shown hereafter. Each PWMinverter is fitted with a local electronic control called the domino board. Thedomino board is controlled by the central DSP. The domino board is fitted withjumpers noted JP100, JP101, JP102, JP103, JP104, JP105, JP106, JP109and JP110 (JP107 and JP108 are off). In case of several power modules, onlythe domino board of the last slave is fitted with jumpers.The PWM reactors convert the voltage created by the PWM inverter intocurrents that will be injected in the network.The output filter consists in line reactors and an RC shunt circuit.The function of the preloading circuit is to avoid at start-up high inrushcurrents that could damage the power electronics or create transients in thenetwork.4.1.2. The controlFor best performances, the control of the PQFA is Digital Signal Processor(DSP) based.The three lines currents are measured by external CT. Those analoguesignals must first be acquired, levelled and antialias-filtered beforedigitalisation. Fast and high precision anlogue-to-digital converters are used tocreate a digital representation of the analogue signals. The digitised signalsare then sent to the powerful DSP that controls all measurements andDC capacitorsLow inductanceDC bus barInverterHeatsink |
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