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Single-phase PWM rectifier, grid connected PV inverter system, static synchronous compensator (STATCOM) all can be implemented by an H-bridge inverter and a large electrolytic dc capacitor to absorb the ripple power pulsating at twice the line frequency (2ω ripple power). This paper proposed a generalized active power decoupling method for H-bridge with minimum voltage and current stress. By adding...
A new space vector modulation (SVM) strategy is proposed for quasi-Z-source indirect matrix converter (QZS-IMC) to reduce common-mode voltage and to ensure a high voltage transfer ratio. QZS-IMC's common-mode voltage is analyzed, and the subdivided sectors are employed to rearrange switching sequence in the inverter stage, which can reduce common-mode voltage and power loss. The proposed modulation...
Three-phase ac systems can be transferred into dq axis, where stability analysis becomes much simpler. In order to apply the stability criterion in AC system, an equivalent DQ admittance model for the ATRU system has been developed in this paper, based on the ABC impedance model in paper [1]. Compared to the literature work, this model has two better features: (1) it is valid in a wide frequency range,...
In modern power networks, the issue of power quality (PQ) is becoming very important because of the increasing of load which sensitive to current disturbances. This is mainly due to the increasing use of non-linear power electronic devices draws non-sinusoidal current and creating a current distortion. As a result there is increasing need for PQ to be monitored to establish the type, sources and locations...
Three-phase ac systems can be transferred into dq axis, where stability analysis becomes much simpler. In order to apply the stability criterion in AC system, an equivalent DQ admittance model for the three-phase diode rectifier has been developed in this paper, based on the ABC impedance model in paper [1]. Compared to the literature work, this model has two better features: (1) it is valid in a...
A two phase ZVS full-bridge converter with a novel hybrid current doubler rectifier structure is proposed in this paper. With the proposed topology, the secondary windings of the transformers work in series when the input voltage is low but in parallel when the input voltage is high. The diode stress on the second winding is reduced and the interleaving operation reduces the current ripple in the...
This paper presents high performance control algorithms for a 100 kVA three-phase four-wire online voltage regulator. The 100 kVA voltage regulator is composed of a PWM rectifier, a center-tapped DC bus, and an inverter. The rectifier connects with the grid through an LCL filter, providing power factor correction and DC-link voltage regulation. The inverter output power is fed forward to the rectifier...
In this paper, different kinds of driving methods for synchronous rectifier (SR) are compared, and a self-biased current driven circuit for SR is proposed. The circuit uses a current transformer (CT) to generate driving signal, as well as provide the driving power. With a capacitor to produce bias voltage, this circuit can be used without considering the location of SR and the output voltage of converter...
This paper presents a novel SPWM control method with voltage balancing capability for the diodeclamped multilevel rectifier/inverter system. A complete analysis of the voltage balance theory based on a 5-level back-to-back converter is given. The voltage balancing effects of the triplen harmonic offset voltage added to all three phase voltages are discussed. The proposed control utilizes the offset...
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