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A novel passive integration structure based on flexible multi-layer foils was proposed for EMI filter in switching-mode power supply. Common mode (CM) inductors and capacitors, differential mode (DM) inductors and capacitors were all integrated in a single unit. This passive integration applied flexible multi-layer foils (FML). Prototypes were implemented for an 1 kW switching power supply. The conductive...
The control of a PWM inverter is affected by variable inductance present in the power line of the grid. This paper presents a new implementation of grid-tied inverter with weighted-average-current feedback control (WAC) and an embedded online technique to determine the grid line impedance. By adding an inter-harmonic voltage periodically in the modulation of the PWM and measuring the current response,...
For a grid-connected converter with an LCL filter, the harmonic compensators of a proportional-resonant (PR) controller are usually limited to several low-order current harmonics due to system instability when the compensated frequency is out of the bandwidth of the system control loop. In this paper, a new current feedback method for PR current control is proposed. The weighted average value of the...
A low cost utility interactive inverter is valuable to the residential PV or fuel cell distributed generations. This paper presents a low cost solution to the single-phase grid-connected inverters, including the inverter topology, filter structure, and the current control methods. The reason for choosing the proposed converter topology is given. A novel current control method using the combinatorial...
A novel integrated EMI filter structure is proposed in this paper, based on FML foils. It integrates common mode inductors and differential mode capacitors and inductors into a single unit. A novel interleaved flexible multi-layer (FML) foil structure is proposed to overcome the difficulty of enlarging the DM capacitance. A prototype is constructed based on this concept and was put into a front-end...
The important characteristics of parallel-connected uninterruptible power supply (UPS) systems are excellent power-sharing quality and stability. In this paper we use the output active and reactive power to adjust the output voltage amplitude and phase to achieve the load sharing. Because of the difference of output filter inductor's resistance and distance of connection wire of each machine in the...
Active power filter (APF) with digital control is widely used to solve harmonic problems. But inherent delay time introduced by digital control significantly affects the performance of APF. Here, we introduce an improved harmonic detection method by using phase-shifting. In order to shorten the computation time of harmonics reference, we use the data calculated in the last sample period. So the delay...
The design of multi-modular shunt active power filter is presented. Multi-modular topology, N+1 redundancy, current sharing scheme, modeling and stability analysis are studied. In addition, a competition rule to determine the master module is developed. Finally, experiments based on two active power filter modules in parallel connection are given to verify the suggested control strategy.
This paper deals with the design of good quality output voltage waveform and excellent power sharing of uninterruptible power system (UPS) inverters with parallel-connection capability. In this sense, the controller is designed by using two nested loops: 1) the inner loop is performed by using the output voltage and inductor current double loop controller, providing a good static and dynamic response...
For higher power application, the six-switch three-phase boost rectifier is a preferred topology. Compared with three-phase three-wire boost rectifier, the three-phase four-wire input rectifier is more usually used in uninterrupted power supply (UPS) systems to prevent the load neutral from floating. In this paper, the four-wire input boost PFC rectifier is modeled and analyzed; the origin of the...
This paper proposes a new control strategy for the transition between grid-tied mode and off-grid mode of the utility interconnected fuel cell inverters with an LCL filter. During the transition from grid-tied mode to stand-alone mode, the inverter control is switched to voltage-controlled mode from the beginning of the transition, using inverter instantaneous output voltage regulation to reduce the...
This paper proposes a new control strategy for the transition between grid-tied mode and off-grid mode of the utility interconnected fuel cell inverters with an LCL filter. During the transition from grid-tied mode to stand-alone mode, the inverter control is switched to voltage-controlled mode from the beginning of the transition, using inverter instantaneous output voltage regulation to reduce the...
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