Research On Dual-Output Two Stage Matrix Converter And Its Applications

Dual output- two-stage matrix converter(DO-TSMC) is a novel dual-output converter topology that derived from the two-stage matrix converter, which inverter stage only just need nine switches can achieve two-phase AC output, which reducing the number of switching power device; no large dc link capacitor, improves the compactness and reliability of the converter, but also has excellent input / output performance compared with two-stage matrix converter.This paper introduces the main topology type and the research status of 9 switch inverter(stage)modulation method,elaborating the advantages/disadvantages of topology and its modulation strategies,propose study object is DO-TSMC dual output converter. At the same time,analysis dual AC motor drive system features and deficiencies under existing dual output converter,proposes the importance and feasibility for studying DO-TSMC converter from the dual AC motor drive system’s volume,compactness,reliability.Firstly, based on in-depth research and analysis operating principle of the DO-TSMC topology,this paper presents a novel space vector modulation strategy in accordance with proportion coefficient assign action time of each inverter,can achieve the same frequency/different frequency two kinds model output and regulate the output voltage range flexibly;Expressions of DO-TSMC input average current, DC average current, the ratio between two inverter stage output and time allocation coefficient under this modulation strategy are derived. Secondly, the DO-TSMC is applied in dual permanent magnet synchronous motor set(Dual-PMSMs) drive system, then, analysis the current dual AC motor and Multi-machine uncoupled coordination control strategy, and Dual-PMSMs closed-loop control strategy is proposed based on DO-TSMC. Finally, establish the DO-TSMC’s open-loop system simulation model, then, build Dual-PMSMs vector control system simulation model based on DO-TSMC.Finally, through MATLAB simulation results verify the correctness and feasibility of the proposed novel space vector modulation strategy and closed-loop control strategy in Dual-PMSMs.