Double parallel active power filtering apparatus

Abstract

The invention provides a double parallel active power filtering apparatus which comprises a DSP, a power supply, a voltage current sampling module, a serial port communication module, an IGBT gate pole drive circuit, a high frequency APF circuit and a low frequency APF circuit. An input terminal of the voltage current sampling module is connected to an electrical network, and an output terminal of the voltage current sampling module is connected to a DSP pin. An output of the DSP is connected to a pin of the IGBT gate pole drive circuit. An output of the IGBT gate pole drive circuit is connected to an IGBT of the high frequency APF circuit and the low frequency APF circuit respectively. The high frequency APF circuit and the low frequency APF circuit are connected to the electrical network back. The power supply and the serial port communication module are externally connected to a DSP port. A voltage transformer is in parallel connection with a current transformer to acquire a signal, a high frequency circuit is parallel connection with a low frequency circuit and the signal is returned to the electrical network, the DSP is taken as a processing unit, a harmonic wave is effectively filtered, and electrical network current is accurately tracked. A soft switch drives the IGBT gate pole drive circuit, zero voltage zero current connection and disconnection of the IGBT are realized, resonance loss is reduced effectively, and precision is raised.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a dual-parallel active power filtering device. Background technique [0002] With the rapid development of power electronics technology, digital circuits have gradually replaced traditional analog circuits. The active power filter system based on digital signal processing chip (DSP) has the advantages of fast, stable and accurate in a series of links such as electrical signal sampling, harmonic detection, current tracking control and PWM pulse generation, so it is widely used. Today's technology requires power electronic devices to be miniaturized and lightweight. At the same time of miniaturization and weight reduction, problems such as switching loss and electromagnetic interference caused by high-frequency switching must be solved. Soft switch technology is developing towards the direction of solving the above-mentioned contradictions. At present,...

AI Technical Summary

Problems solved by technology

At present, basically all soft switching technologies are based on the principle of resonance, but a network with resonance will inevitably generate resonance loss

Images