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The power quality of grid-connected inverters has drawn a lot of attention with the increased application of distributed power generation systems. The repetitive control technique is widely adopted in these systems, due to its excellent tracking performance and low output total harmonic distortion (THD). However, in an actual system, the ratio of the sampling frequency to the grid frequency cannot...
The repetitive control technique is widely adopted in AC systems, because it can achieve excellent tracking performance and low total harmonic distortion (THD) when regulating periodic signals. This paper proposes an improved repetitive control scheme for three-phase systems. The proposed scheme adopts one-sixth of the fundamental period as the delay time in the positive-rotating and negative-rotating...
In this paper, a double closed loop current controller is proposed for Parallel Hybrid Active Power Filter (PHAPF) characterized by series connection of a three-phase single-tuned series resonance LC filter for the seventh harmonic frequency and a low voltage rating three-phase voltage source PWM inverter. The proposed controller is composed by a grid current feedback control and a 5th harmonic of...
In this paper, a new droop controller for parallel connected UPS inverters is presented. The proposed controller is based on the droop method in order to avoid the using of communication signals between the modules. The paper studies the control of the active and reactive power flow through the analysis of the output impedance of inverters and its impact on power sharing. As a consequence, we propose...
Phase-shift full-bridge (PSFB) Dc/Dc converter has been investigated for decade years and many auxiliary techniques and improvements have been proposed already in the foregoing works to overcome its inherent drawbacks, such as narrow ZVS range for the lagging leg switches, large duty cycle loss and primary-side circulation loss with heavy output load. However, the additional loss and cost are always...
This paper presents an improved controller for parallel connected single-phase UPS inverters in distributed generation application areas. The proposed control strategy needs only locally measurable feedback signals with communicationless between each inverter. It also shows how the improved adaptive droop method can be easily adapted to account for the operation of parallel inverters, providing good...
This paper presents the theoretical analysis and experimental results for a frequency controlled LCC resonant converter. A prototype based on LCC resonant converter employing resonant gate drive synchronous rectifier is constructed to validate the theoretical analysis. The experimental results are in good agreement with the theoretical predictions.
Digital control of distributed power system is the developing trend of power electronic system integration. The prominent merits of LLC resonant topology can be specified as follows, full range of ZVS for primary switches and ZCS for secondary diodes are achieved, integration of resonant inductor and transformer is easy, wide range operation is realized. This paper deals with investigation about application...
The interleaved multiphase resonant topology is very attractive for VRM since faster transient response and higher power density are required to meet the increasingly high demands for speed and efficiency of the next generation microprocessors. However, to solve the control strategy issue for the interleaved multiphase resonant VRM, a novel control scheme was proposed. The driving signals of this...
This paper studies the approach of derivation of three-level (TL) half-bridge (HB) topology from conventional full bridge DC/DC topology. The derived TL HB topology has same device count and performance as the corresponding full bridge topology, and it is more suitable for high voltage applications. The derivation approach for different control method, i.e. PWM control, frequency control and phase...
Using conventional three-stage low-frequency square-wave electronic ballast, low-wattage MH lamps may have trouble in starting-up instantly and smoothly. This paper investigates the special starting-up characteristics of low-wattage MH lamps and presents some novel control strategy according to the lamps' special characteristics. A prototype of 70 W electronic ballast with the new control circuit...
This work presents a new voltage balancing theory for the diode-clamped multilevel converter/inverter system. A complete analysis of the voltage balance theory based on a 5-level back-to-back converter is given. The analysis is based on fundamental frequency switching control and then extended to PWM control, which can extremely lower the harmonic components of the voltage. Simulation and experimental...
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