The circulating current flows between inverters due to DC-offset voltage and fluctuation of AC output voltages. This strategy uses the fundamental voltage and phase droop scheme to allow the inverters to share their load currents and uses a DC-offset droop scheme in order to eliminate DC circulating current.
However, when the inverters share a common DC source and AC bus, a circulating current is generated, which causes output current distortion and system power losses. These harmonic components of circulating current influence the inverter life cycle, and it can limit the power rating of the total parallel-connected inverter.
Modular inverters have a closed circuit when each inverter shares the common DC source and AC bus. The cir-culating current is generated by diferences in each inverter, such as hardware parameters and control process. The circulating current deteriorates the output current quality and degrades the reliability of the parallel system [12–15].
Almost no DC cross current can be seen. The proposed controller achieves a low circulating current between two inverters in steady-state is shown in Fig. 11. Fig. 12. steady state voltage waveform across Load X a x i s: 25 m s / d i v, Y a x i s: 50 V / d i v. Fig. 13. load current waveform X a x i s: 25 m s / d i v, Y a x i s: 2.5 A / d i v.
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lity, amplitude and phase synchronization, and circulating current. Therefore, it is necessary to study the parallel control strategies for the inverters in m crogrids and to develop …
This paper proposes an advanced control strategy to eliminate both current sharing error and DC circulating current caused by line impedance mismatched and meas
<p>A modular-parallel IPT system with multi-inverters is proposed to enhance power capacity and expansibility for primary power equipment. In order to balance the actual output power of each …
The circulating current flows between inverters due to DC-offset voltage and fluctuation of AC output voltages. This strategy uses the fundamental voltage and phase droop …
This paper proposes a new adaptive instantaneous average current sharing technique for load current sharing and minimizing circulating current among parallel-connected …
This paper proposes a novel control strategy of suppressing dc current injection to the grid for three-phase inverter by accurately sensing the DC component of line voltages of …
This paper proposes an advanced control strategy to eliminate both current sharing error and DC circulating current caused by line impedance mismatched and …
However, when the inverters share a common DC source and AC bus, a circulating current is generated, which causes output current distortion and system power …
Parallel inverters have the advantages of low‐output harmonics and high‐parallel power, making them very suitable as the topology structure for an electric motor emulator. …
Abstract— This paper analyzes the imbalances that produce circulating current in a system of two three-phase Voltage Source Inverters (VSI) with Space Vector Pulse Width …
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