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This paper proposes the improved topology and control strategy of three-phase cascaded bridgeless rectifier (CBR) suitable to serve as the rectifier stage for a medium/high voltage multilevel converter. Compared with traditional H-bridge based multilevel rectifiers, the proposed topology adopts much fewer fully-controlled devices, which greatly reduces the control complexity, thus increasing the system...
An interleaved boost power-factor corrector (PFC) with average current control is studied in this paper. It comprises two interleaved boost circuits connected in parallel and operated with average current control. The interleaved operation reduces the input current and output current ripples and also improves the circuit efficiency at light load condition. This paper analyzes the interleaved PFC pre-regulator...
This paper presents the design of a modified Vienna rectifier for single phase power factor correction (PFC) under RL load. This research proposes a newly developed scheme consist of a modified Vienna rectifier for converting AC to DC, a simple control circuit for controlling single phase modified Vienna rectifier switching, a single phase inverter (H-bridge) for converting power from DC to AC, a...
Most of the AC-DC systems include an AC DC converter for power factor correction followed by an isolated DC-DC converter. AC-DC converters will introduce harmonics to the input current waveform as it contains nonlinear elements, so a suitable control technique is required to smoothen the input current to reduce harmonics. For high power applications, Bridgeless interleaved (BLIL) AC-DC converter is...
This paper describes the closed loop space vector modulation strategy for Active Front End Converter (AFC). Low value of Power factor and excessive harmonic content are major disadvantages of conventional converter. To alleviate this problem, Carrier-Based-Sinusoidal Pulse Width Modulation (CB-SPWM) can be implemented in PWM converter; Narrow range of linear operation of converter is limitation of...
Vienna and Modular three phase Boost power factor correction rectifiers are similar in working principle and performance. In this paper two rectifier schemes are presented as Vienna Rectifiers scheme-1 and scheme-2. A third three phase rectifier scheme, the three phase three switch modular SEPIC rectifier topology is also presented. The SEPIC topology has step-up/down voltage gain characteristic,...
Reduced switch count switched reluctance motor drives are among the technologies proposed to replace single-phase induction machines in industrial drives including the compressor market. The split-ac drive in particular can offer relatively high performance with half of the number of switches and diodes per phase as compared to the asymmetric bridge which is typically used in SRM drives. Its main...
Two solutions for twenty-eight watts solid state lighting system were performed. The first one using two cascaded stages (power factor correction and constant current source) and the second one is an integrated stage (power factor correction and constant current source integrated). For each solution the corresponding design methodology was developed and electrical performance was evaluated in terms...
To reduce the cost of the conventional two-stage power factor correction (PFC) converters, single-stage PFC (SSPFC) converters have been studied in literature. Most commonly, the SSPFC converters are operated at DCM mode due to the simplicity of the control, non-existence of the reverse recovery losses. For ac/dc converters supporting universal input voltage range, DCM operation with relatively low...
According to increased industrial loads, active power filters have been used a lot to compensate harmonics and reactive load current components. In this paper a new control method with grid power factor control is proposed for three phase active power filters. In the proposed control method the grid current amplitude is calculated based on the well known power balancing method. The phase of this signal...
The paper presents performance analysis and optimization of digital pulse width modulation (PWM) techniques for surface-mounted permanent magnet synchronous motors (SPMSM). Three specific PWM techniques such as sinusoidal PWM (SPWM), space vector PWM (SVPWM), and hysteresis PWM (HPWM) are designed and implemented for three-phase voltage source inverter-fed SPMSM drive. Each of the PWM technique is...
Wind generating facilities often require significant reactive power support to maintain voltage and power factor within operating limits prescribed by the transmission grid entity. Many installations include multiple stages of switched capacitor and reactor banks for this purpose. Coordinated control of these capacitor and reactor banks, which are often connected to the point of interconnection via...
This paper introduces a new cost effective structure of a 4-switch single-phase to three-phase converter using a Quasi Z-source (QZs) network for induction motor drive applications. In comparison to the traditional 6-switch structure, the proposed circuit reduces the cost of the system, switching losses and the complexity of the control method as well as the interface circuits used to make the trigger...
The conventional voltage source inverter is only a buck converter and conventional current source inverter is only a boost converter. By adding a Z-Source network, the buck-boost capability can be achieved. The recently proposed Quasi-Z-Source inverter (qZSI) is an important improvement to Z-Source inverter (ZSI), which greatly reduces the passive component stress. The current-fed qZSI can buck-boost...
In this paper, a high gain single-stage buck-boost grid-connected system is proposed. The proposed system consists of a high voltage gain - high efficiency - switched inductor buck-boost converter (SIBBC) and a folded cascade H-bridge inverter. The proposed converter switch is derived with a sinusoidal modulation, so that the converter output voltage is a rectified sine wave which requires only a...
This paper introduces the 110kV substations power supply system and devices of Anhui GITI Tire Company Ltd., analyses the principle of voltage management and proposes to improve the methods of voltage management quality for solving the difficulty of stable operation of power utilization for large chemical enterprises, which solution has application value.
Power Transmission Systems have predominantly inductive loads, so that the systems themselves must supply the reactive power consumed. The most practical and efficient way for the utility to supply the reactive power demanded is through the installation of Mechanically Switched Capacitors (MSCs), more common know as shunt capacitor banks. The installation of MSCs brings benefits concerning the reduction...
This paper presents a novel control strategy for cascaded H-bridge based multilevel rectifiers (CHBBR) to operate under unbalanced load and dc-bus voltage conditions. The proposed control strategy exploits the power factor as a degree of freedom to stabilize the rectifier operation. The controller is designed for single-phase seven-level rectifiers and its main feature is that it allows the multilevel...
In order to increase energy independency and decrease harmful vehicle emissions, plug-in hybrid electric vehicles (PHEVs) have been suggested as viable replacements for conventional internal combustion (IC) vehicles. In the event that PHEVs do command a large market share, their interactions with the grid could either become a large asset or a large burden for the grid, depending on the interface...
This paper presents a three-phase electric drive with a modified electronic smoothing inductor (MESI) having reduced size of passive components. The classical electronic smoothing inductor (ESI) is able to control a diode bridge output current and also reduce not only mains current harmonics but also output voltage ripple. ESI performs the function of an inductor that has controlled variable impedance...
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