| This paper deals with the performance evaluation of space-vector-modulated matrix converters under input unbalanced and output balanced conditions. Two control strategies of the input current displacement angle are presented and compared. The first one is based on keeping the input current vector in phase with the input voltage vector. In the second one, the input current displacement angle is dynamically modulated as a function of positive and negative sequence components of the input voltages. In both cases, the harmonic content has been evaluated analytically.At first, two simulation models for two methods are built by Matlab Simulink, which are used to test the control algorithm and the whole system. Harmonic components of the input current in method 2 is lesser than method 1, neglecting the losses and switching effects of the converter. The decreation of the harmonic components is not apparent, but different between method 2 and method 1, due to the influence of switch losses of the IGBT, which is consisted of two IGBT and two FRD. It can be seen that the difference of the harmonic component comes from different strategy , and it can also be reffered that the difference of the harmonic component reflects the decreation of the harmonic component.A set of experiment eqipment of MC under input unbalance is designed and debuged. The DSP is controller, IMBH60-100 IGBT is power switch device and EXB840 is driver. The results of the experiment succefully show that it can realize the modulation of the frequency and amplitude of the output voltage.Simulation models in this paper present convenient analysisand debug tools. The experiment makes good basis for practical application. |
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