A set of models for systems with cascade frequency converters

New sets of computer models for electromechanotronic systems containing cascade frequency converters (CFC) were developed. Models are implemented in C++ in the ComSim proprietary development environment, as well as in MatLab. Installations in which CFCs are fed from a three-phase voltage source of limited power and feed a three-phase passive load or motors (asynchronous, synchronous, double fed machine) are considered. The CFC includes a multi-winding transformer and frequency conversion units (BFC). In each load phase of the CFC, several BFCs are connected in series, forming a high-voltage power source. BFCs are performed with diode or active rectifiers (DFE, AFE) and single-phase voltage source inverters (VSI). Vector control AFE (VC), as well as scalar and VC of load, are implemented. Provisions are made to disable part of the BFC when implementing current vector correction blocks in the control system, to improve the quality of power at the input and output of the CFC. The possibilities of reducing the cost of computer time for calculations in ComSim and MatLab by using algorithms for calculating the «smooth components» of variables and using mixed models are considered. The use of new algorithms makes it possible to calculate long-term electromechanical processes in CFC installations with a large number of semiconductor elements with a higher speed, up to real-time calculations.

Authors: A. G. Vorontsov, M. V. Pronin, Yu. A. Sychev, A. P. Soloviev

Direction: Electrical Engineering

Keywords: cascade frequency converter, DFE, AFE, VSI, power quality, control algorithm, simulation, machine time costs

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