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In PWM converters, high dv/dts due to fast switching of the power devices can cause serious common mode electromagnetic interference (CM EMI). Theoretically, a single-phase full-bridge inverter under bipolar SPWM operation should produce very low CM noise because the two phase legs operating in a complementary manner can compensate for each other. However, in practice this ideal scenario will never...
This paper presents the analysis and design of a multiple-loop feedback control scheme for single-phase voltage source inverters with a L-C filter. In the proposed control scheme, a PI regulator in the outer voltage loop and a P regulator in the inner current loop are incorporated, and a plug-in repetitive controller is adopted to improve steady-state performance. Load current feed-forward compensation...
One digital control scheme, which is based on voltage differential feedback control and repetitive control, is proposed in this paper. For the first form, arbitrary pole placement can't be achieved, but the pole scope in the digital field that covers almost the applicable field, and higher accuracy in steady state is attained. For the latter form, arbitrary pole assignment can be achieved with the...
This paper presents the analysis and design of a multiple-loop feedback control scheme for three-phase voltage source inverters with L-C filters. In the proposed control scheme, a PI regulator in the outer voltage loop and a P regulator in the inner current loop are incorporated, and a plug-in repetitive controller is adopted to improve steady-state performance. Through theoretical analysis, it can...
A modified equivalent circuit for common-mode (CM) current of single-phase full-bridge inverters is proposed. The circuit allows application of superposition theorem, and it provides more insights into the propagation mechanism of the CM noise. Simulations and experiments are conducted on an inverter test setup to validate the proposed circuit. Three operation conditions are studied: (1) with one...
Based on an in-depth analysis of the DC imbalance problem of UPS inverters, an observation is made that in most cases where instantaneous voltage feedback control is applied, the control algorithm itself is the most significant cause of DC imbalance since it inevitably generates DC bias in the output PWM gating signals. This situation becomes even worse when some integral action is included in the...
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