SHEPWM control system and method for multi-level inverter

Abstract

The invention belongs to the technical field of the inverter, and particularly relates to an SHEPWM control system and method for a multi-level inverter. The SHEPWM technology of the multi-level inverter is realized by adopting a particle swarm-bacteria foraging optimization algorithm (PSO-BFO), so that the output waveform is ensured while the switching angle is worked out accurately, and the purpose of eliminating special harmonics, simplifying the operational process and shortening the calculation time is achieved. The SHEPWM control system for the multi-level inverter comprises a DPS processing circuit, a voltage sampling circuit, an isolation driving circuit, a switching power supply circuit and a voltage sensor, wherein the voltage sensor, the voltage sampling circuit, the DPS processing circuit and the isolation driving circuit are connected in sequence; and the output port of the isolation driving circuit is connected with the control port of the switching device of a T-type three-level photovoltaic grid-connected inverter.

Description

technical field [0001] The invention belongs to the technical field of inverters, and in particular relates to a SHEPWM control system and method of a multilevel inverter. Background technique [0002] In recent years, power electronics technology has developed rapidly, and multilevel inverters have received more and more attention in the field of high voltage and large capacity. Multilevel inverters have the advantages of low harmonic distortion rate and high energy conversion efficiency, high output voltage and high power, and do not require output transformers for assistance, so they are widely used in high-voltage and high-power applications. Since the grid-side current and voltage waveforms are easily affected, and most of the loads are non-linear, it is easy to cause distortion of the fundamental current, and the generated harmonics will interfere with the stable operation of the equipment, increasing the scrap rate of the equipment or parts, which will bring to great...

AI Technical Summary

Problems solved by technology

Among them, by improving the topology of the inverter, building multiple inverter circuits can achieve harmonic elimination, but the circuit structure is more complicated, the cost is high, and it will cause other problems

Harmonic interference can be effectively suppressed by introducing a power quality compensator, but the requirements for system parameter settings are high, and unreasonable design may even affect the stability of the system

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