Abstract : The power unit of a multi-level series voltage source high-voltage frequency converter operates in a multi-level, high-electromagnetic environment, where electromagnetic interference (EMI) severely threatens the stable operation of the device. Improving the EMI performance of the power unit enhances the stability of the device's operation. Six EMI performance tests were conducted on the power unit, and five improvements were made based on the identified issues. The power unit's performance against electrical fast transient/burst (EFT) pulses was improved from 2.0kV, 24s to 3.0kV, 300s. After the power unit modification, continuous operation tests were performed on the entire unit, eliminating the previous defect where the power unit frequently reported false faults during continuous operation.
Keywords : high voltage frequency converter, EMC, electrical fast transient/burst
Abstract : Aim at The frequency inverter equipment of voltage source of cell mid series of multi-level voltage of power cell on the many mid voltage and high electromagnetic environment, with electromagnetic disturbance is severity imperil equip-ment by run tran quilization． Pass improver the power unitl EM I function, eq uipment circulate more stabilization. Pass six degree Electromagnetic compatibility tests by the power cell, basis of problem to the power cell being five degree alteration． The power cell electrical fast tran sient burst of function form 2kV, 24s grade up to 3kV, 300s grade． Achieve improve the power cell, being hour after hour function test by holistic equipment, it eliminate regular wrong appear malfunction in time holistic eq uipment hour after hour function primary the power cell．
Key words : High voltage inve~er EM C Electrical fast tran sient burst
1 Introduction
The main topology of the multi-level unit series voltage source inverter consists of a phase-shifting transformer and 18 identical power units. In each power unit, the main circuit comprises a diode rectifier bridge, thyristors, IGBTs, and other power devices. The controller uses a CPLD, AVR, fiber optic receiver, and fiber optic transmitter. The large-scale integrated circuits, AD converters, and communication control chips within these components are highly sensitive to electromagnetic interference.
For details, please click: Improvement of Electromagnetic Compatibility of Inverter Power Units
