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Switching harmonic attenuation has always been challenging for inverters used in high-power conversion applications, where ratio of switching to fundamental frequency is low. Addition of multiple LC-trap filters is no doubt a feasible cost-effective method, which has increasingly been used, but generally susceptible to filter parameter variations and harmonic resonances. This paper hence presents...
The capacitor voltage of an LCL-filter can also be used for active damping, if it is fed back for synchronization. By this way, an extra current sensor can be avoided. Compared with the existing active damping techniques designed with capacitor current feedback, the capacitor voltage feedback active damping would however demand a noise-sensitive derivative term. A digital realization of this derivative...
The single-phase differential mode buck inverter is recently introduced with a differential mode for power transfer and a common mode for actively decoupling the second-order power oscillation. However, it is limited to islanded applications with an LC filter. This paper addresses the stability and control of a grid-connected differential mode buck inverter with an LCL filter. A generalized small-signal...
This paper proposes a power electronic based device to actively trap the switching current ripples for highpower converters. Control principle and system design of the active trap filter are discussed first. Comparisons of the active trap filter with LCL and LLCL filters are then carried out in time-domain simulations and experimental tests. The results demonstrate that the active trap filter not...
This paper concentrates on the design, control and implementation of an LCL-filter-based shunt active power filter (SAPF), which can effectively compensate harmonic currents produced by nonlinear loads in a three-phase three-wire power system. The use of LCL-filter at the output end of SAPF offers superior switching harmonic suppression with much reduced size of passive filtering elements. This allows...
In this paper, a double-edge modulation based one-cycle-control (OCC) scheme is presented for regulation of active rectifier. With minor modifications made in OCC core, the nonlinear carrier formed by integration and reset of dc-link voltage error turns out to be a symmetrical triangle waveform in steady-state, which can effectively eliminate the even order harmonics generated by the conventional...
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