The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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 presents a method to minimize the losses and the magnetic cores volume in a single-phase active power filter based in a two stages grid-connected PV system. The proposed circuit injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is very high independently of the solar radiation...
The paper presents a novel self adjusting wind energy utilization scheme using a modified single phase operation of the three phase induction generator supplemented by a voltage stabilization switched filter compensation scheme. The series-parallel switched capacitor filter scheme is controlled by a dynamic Particle Swarm Optimization PSO error driven self adjusting controller to ensure voltage stabilization,...
This paper proposes the Unified Hybrid Power Quality Conditioner (UHPQC). The proposed topology manipulates, at the same time and in continuous way, the displacement power factor and also it mitigates the dominant harmonic component of the line current. The structure is composed by a small rating Active Power Filter (APF) in series with a single passive filter. The main objective of this topology...
This paper presents a digital controlled distributed converter system with a switched-mode boost type PWM rectifier and several bidirectional buck/boost dc/dc converters for battery charge and discharge system using digital signal controller (DSC). The rectifier can implement bidirectional power flow, sinusoidal current control and unit power factor in grid side. The system is able to control power...
In this paper it will be presented through simulations, the verification and validation of a previously built Matlab/Simulink/Sim-Power-Systems toolbox for a PWM AC-to-DC converter provided with a new line conditioning control strategy, more complex and useful than the actually applied unity power factor rectifier control method. It will be studied the performances of this converter toolbox by applying...
This paper adopts a main circuit structure with back-to-back PWM converter, in which generator-side using direct torque control method, and grid-side adopts three-phase VSR inner current decoupling control based feed forward control algorithms, and this paper proposes an improved MPPT control methods, which can achieves more quickly and effectively tracking the maximum power. Finally, the effectiveness...
This paper proposed a novel dynamic reactive power compensation circuit topology which is applicable to low voltage distribution system. It described the composition, features, and working principle of dynamic reactive power compensation system. Open-loop SPWM control strategy is applied for the inverter, by adjusting the inverter output voltage to dynamically regulate the absorption or emission of...
In recent years, space vector pulse-width modulation (SVPWM) technique obtains widespread application in AC modulation because of its high utilization of dc bus, fast dynamic response and easier digital realization. The paper focuses on the bi-dirction control methodology based on a 50 kW three-phase AC-DC PWM rectifier of high power factor. Active and reactive current are controlled respectively...
A single-stage structure is proposed for realizing a unity power factor three-phase isolated AC-DC converter for telecommunication power supply modules. This structure is composed by integrating a boost converter to the isolated three-phase three-switch buck rectifier. Modified space vector modulation method is applied to the three-phase three-switch isolated unity power factor input buck rectifier...
In this paper the current control performance of photovoltaic inverters is taken into account. The analytical contribution to the output current due to the grid voltage is analysed and a novel current reference feed-forward is considered in order to compensate for that effect and guarantee a proper current control when feedback current to current controller is measured on the inverter-side inductor...
This paper presents a three-level three-phase neutral-point-clamped back-to-back converter applied to a wind emulator, where a wind power generator is connected to the grid through the back-to-back converter. The converter regulates the power extracted from the generator and controls how this power is injected to the grid with the desired power factor. Two phase locked loops are in charge of synchronizing...
In this paper, a new current based maximum power point tracking (CMPPT) method is proposed for a single phase photovoltaic power conditioning system and the current based MPPT modifies incremental conductance method. The current based MPPT method makes the entire control structure of the power conditioning system simple and uses an inherent current source characteristic of solar cell array. Therefore,...
With the increase of train density and velocity of the urban rail transportation system, the main stream of the development of the traction power supply system is aiming at higher power, better power factor, better stability and the conservation of energy, making PWM rectifier a study focus in such field. Considering the traction voltage of 1500 V, this paper presents research on the characteristics...
Many types of microgeneration technologies are interfaced with the low-voltage distribution network through power electronic converters. The converter provides conversion of the microsource frequency to the conventional power system frequency of 50/60 Hz, and controls the power exchange between the generator and the load/utility system. A power factor control strategy is presented, which demonstrates...
The paper deals with AC substation inverter control for power quality improvement in high speed railways. The advanced substation configuration, already proposed by the authors in previous publications, has been further improved with reference to compensator configuration, inverter control and parameter identification. The configuration is based upon a two-phase inverter, employing modular topology,...
An inductive power transfer (IPT) system driven from a single phase utility is shown to be suitable for low power situations applicable to home and office and other small scale applications. The complete system is low cost yet highly efficient and in a novel development achieves essentially unity power factor at the input by modulation of the power controller in the pick-ups, while still achieving...
This paper proposes a novel monitoring and control system for achieving real-time monitoring and control of a hybrid wind-PV-battery renewable energy system. The proposed system constitutes a supervisory control and data acquisition (SCADA) system that employs campus network of National Cheng Kung University integrated with a programmable logic controller (PLC) and digital power meters. The proposed...
In this paper three voltage control, strategies for three- phase AC voltage regulator have been studied. These strategies depend on varying the stator ac voltage to control the speed of three-phase induction motor. These strategies are phase angle control (PAC), extinction angle control (EAC), and modified phase angle control (MPAC). The first control strategy is carried out using three back-to-back...
This paper investigates the impact of reactive power on the electricity market equilibrium. The analysis is performed using an interior point algorithm based on the AC network model for determining the Nash supply function equilibrium (SFE) of bid-based electricity markets. The effect of reactive power is examined using two different voltage regulation control modes at the generation buses. The generator...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.