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For grid-connected LCL-filtered inverters, recent applications often observe a weak grid at the point of common coupling (PCC) with non-negligible grid impedance. In this case, the previous control methods would perform poor or even cause the inverter protection. Especially when the feedforward of PCC voltage is designed to suppress grid current harmonics, phase and gain margins will be largely reduced...
Open-end winding topology with a common DC source has path for zero-sequence current. Zero-sequence current needs to be suppressed because it does not contribute to the drive torque but has harmful effects such as loss and torque ripple. Both inverter and motor have sources of the zero-sequence component. The zero-sequence source on the inverter side is the voltage error due to dead time in switching...
According to the advantages and disadvantages of the traditional control strategy used in modular multilevel converter (MMC), an improved control method is discussed in this paper. In the proposed method, the outer loop of traditional control strategy is still in use to balance submodule capacitor voltage. However, the dc component extraction and quasi-proportional resonant controller (quasi-PR) controller...
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