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This paper presents the theoretical analysis on the errors in voltage synthesis and position estimation due to the voltage distortion in position-sensorless operation. Especially, the pulsating square wave signal injection method into the estimated d-axis would be focused on, revealing the nature that the position estimation performance depends on the frequency of the injected signal. From the analysis,...
This paper proposes a PWM method reducing harmonics of two interleaved converters at twice the switching frequency region. If harmonics at twice the switching frequency region can be reduced by the PWM method, the size of filter interfacing the grid and converter would be reduced. Based on Fourier series of phase voltage in every switching period, offset voltage for PWM minimizing harmonics at twice...
A switching loss of Modular Multilevel Converter(MMC) might increase drastically in HVDC system because the number of sub-module(SM) is proportional to the DC-link voltage. And, a special strategy for reducing switching frequency has been significant research issue in terms of overall operating efficiency of MMC for HVDC system. The voltage fluctuation of capacitor in SM, however, increases as the...
This paper is to compare the loss of the each 3 level topologies for four-leg voltage converters. In case of the power conditioning system connected to the grid without a transformer, 4 leg topology is essential to cover the unbalanced three phase loads. Using simulations with real loss data table of the power switches, loss analysis of the each 3 level topology with 4 legs according to the different...
Exploiting the capability of an FPGA, a digital current controller of a single-phase inverter for grid interface is designed and implemented. A proportional and resonant (PR) controller realized in a parallel structure in the FPGA is used to reduce the harmonic current to AC grid. The harmonic compensators based on the PR controller are implemented up to the 19th order. The size of the LCL filter...
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