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In this study, networked control scheme applied in dq0 coordinate for three-phase parallel inverters of distributed generation units is presented to achieve flexible current weighting distribution. Firstly, the output impedance based on generalised state space averaging method with the consideration of dead-time effect is investigated in dq0 coordinate and proved to be inductive for fundamental components...
In this paper, two power-sharing strategies of the fast networked control system for inverter parallel operation is proposed, which differs in transmission signals of power. Because of the rapidity of control period, the transmission time-delay can not be ignored. After the description of implementation method and mathematical modeling of systems, two control strategies are carried out the comparison...
In this paper, a series of power-sharing strategy based on networked control for parallel-connected inverters is introduced. In order to enhance robustness of system, a novel data processor is proposed. By means of controlling control data flow, the different power-sharing methods are scheduled depending on communication situation and system operational state. Therefore, even in the case of module...
A networked control method for multi-inverter parallel system is proposed in this paper. Current-sharing control strategy and communication design are described. TOD (Try-Once-Discarded) scheduling mode is used to realize the real-time and accurate transmission, and the Joint scheduling algorithm of TOD is implemented to predict the networked control system performance with network time-delay. The...
In this paper, the sliding mode controller (SMC) based on reference triangular wave (RTW) is presented to obtain a constant switching frequency and remain the advantages of traditional SMC. The basic frame and operation of the new control strategy is introduced. The analysis and design for new controller scheme of voltage source DC-AC Buck inverter is presented. The system parameters and characteristics...
This paper presents a full digital controlled current-source inverter (CSI) used in AC power source, which may generate sinusoidal currents with adjustable amplitudes and frequencies over a wide range, as well as various arbitrary waveforms that fundamental sine wave with harmonics. A discrete-time sliding mode controller based on a novel reaching condition has been applied to control the CSI. The...
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