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In stand-alone brushless doubly fed generator (BDFG) based shaft power generation system, the output voltage of BDFG is strong influenced by the filter of load side converter (LSC) because of the coupling caused by the stator power winding leakage inductance. In order to eliminate the harmonic of the voltage, the LC-L filter based on the leakage inductance is put forward in this paper. The relationship...
In the stand-alone brushless doubly fed generator (BDFG)-based shaft power generation system, the stator power winding leakage inductance leads to the strong coupling between load side converter (LSC) and BDFG. In this study, the leakage inductance was used as a part of LCL filter. The difference between LC-L and conventional LCL filter has been analyzed to reveal the damping characteristic that LC-L...
Owing to LCL-filter resonance, a single loop may not be adequate to stabilise the digitally controlled LCL-type grid-connected inverter, thus the capacitor-current-feedback active damping is usually introduced. However, the computation and pulse-width modulation delays of the digitally controlled system significantly affect system stability and damping performance. Moreover, the delay varies when...
This paper investigated a controller design method for double loop comprising of inner current loop and outer DC voltage loop based on virtual resistor used in a LCL-based bidirectional DC/AC converter which is the front stage of the two-stage power conversion system (PCS). First, besides considering the extent of resonance damping to design the feedback coefficient of the capacitor currents, the...
An inductor-capacitor (LC) filter is normally required at the input of the matrix converter, to assist in the commutation of switching devices and to mitigate input current harmonics. However, its presence, in turn, often results in degradation of dynamic performance and instability of the system. This paper gives a simple procedure to select the input filter parameters for the matrix converter and...
This paper deals with the input filter design of matrix converter. Regard the matrix converter as a buck type PWM rectifier in the input side, the transfer function of input current using LC input filter is deduced. The parameter selection approach for the capacitor and inductor is presented. It has been verified that when LC circuit is adopted in the input filter, the input current will oscillate...
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