Modeling of Steady-state Characteristics and Research on Power Operating Region of Modular Multilevel Matrix Converter with Ripple and Harmonic
It is a prerequisite and basis to define the power operating region of modular multilevel matrix converter(M3 C).However,due to the difficulties in modeling the ripple and harmonic characteristics of the M3C,the existing research fails to fully consider the effects on the peak and root mean square(RMS)of the electrical volume,resulting in inaccurate calculation results.Therefore,this study proposes the dynamic modeling method of dq domain for M3C ripple and harmonic coupling characteristics,and establishes a 21-dimensional model.Then,it proposes the steady-state operation point solution method,and calculates the M3C power operation region with typical examples considering the constraints of grid side current,modulation ratio,RMS of bridge arm current and peak capacitance voltage of sub-modules.At the same time,the approximate calculation method is proposed to solve the problem of many factors affecting the peak capacitance voltage.Finally,some suggestions for expanding the power operation range are put forward.The research results show that the model has high precision.The power operating region of M3C is mainly determined by the current constraint of the grid side under heavy load,and by the capacitor voltage fluctuation constraint of the sub-module under light load.The suppression of harmonic circulation is helpful to improve the M3C power operating range.When the reactive power on both sides of the M3C is large and opposite in direction,the power operating range decreases.
fractional frequency transmissionmodular multilevel matrix converterconverter modelingphasor modelpower operating region
万方数据
维普
