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In this paper, authors propose a novel six-band hysteresis technique to control the seven level packed U cells (PUC) converter which was first introduced in. This converter combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed six-band...
This article investigates how power electronic interfaces for loads provide reactive power in case of abnormal voltage conditions. An evaluation of voltage support is done for different values of voltage sags when the power electronic interface provides with reactive current. The stability margins of the distributed system are investigated for different types of loads and it is proved that the higher...
Power converters are an important component of microgrids. They help interconnect renewable sources and energy storage systems in a microgrid. In addition, power converters can provide ancillary services to improve power quality within the microgrid and facilitate interconnection with the electrical power system. The size and the number of the power converters required will depend on the fluctuating...
Hysteretic modulators have superior dynamic performance and they help in reducing the number of output capacitors without sacrificing the transient response. This paper discusses the dynamic modeling of hysteretic modulators with variable switching frequency. Small-signal characteristics of the modulator are derived. An easy-to-use, numerically-efficient model is developed to accurately predict the...
This paper proposes a design of a controlled voltage bus for a PV source to be used in a hybrid DC distribution system infrastructure. Load centers, boost converter, and distribution panels combine to link the solar collectors with multiple loads and Backup battery systems add to the complexity of a PV installation. The controlled voltage bus is constructed based on the design of a DC-DC boost converter...
The Indirect current mode control is applied in the Phase-Shifted Series Resonant Converter System (PSRC). The current is generated from resonant tank vector and the resonant current is regulated indirectly through quasi-current mode control and thus the dynamic performance of the converter system is improved. Only single voltage feedback is required for the system. The proposed system consists of...
A new “model-free” control methodology is applied for the first time to power converters, and in particular to a buck converter, and to a Ćuk converter. We evaluate its performances regarding load and supply variations. Our approach, which utilizes “intelligent” PI controllers, does not require any converter identification while ensuring the stability and the robustness of the control synthesis....
Modeling tools used to analyze power supply systems usually rely on detailed and complex models, thus taking a long simulation time. Due to the acceleration of time to market of today's computing platforms, it is required reach at a feasible solution in a short amount of time. This paper describes a toolkit developed to improve the design flow power systems with a large number of loads. The main characteristic...
This paper presented a novel Proportional Integrator Current Chopping Control(PICCC) based on Switched Reluctance Generator(SRG). The fundamental principle of the PICCC is based on the minimization of torque ripple of the SRG. The excitation parameters for the SRG system operates at sufficiently high speed that it operates in the single pulse mode. In this paper PICCC based SRG modeled are simulated...
This paper introduces local control as applied to multiple module dc-dc converters. Local control is a form of distributed control that emphasizes each module's local information when making basic control decisions. There is no central controller or master controller. The design of simple, modular, and cooperative power converters is a primary motivating factor of this work. The challenges and opportunities...
Multilevel voltage-source converters (VSC) are attractive for high-voltage and high-power applications. However, the increased part counts and control complexity also complicate the converter modeling and control. One particular control problem is the balancing of dc capacitor voltages. Conventional voltage balancing control design has been based on periodic steady-state or line-cycle averaged models...
Digital controllers based on specific hardware (FPGA or ASIC) described in hardware description languages (HDL), such as VHDL or Verilog, have been applied to low or medium DC/DC switching power converters in the last years. Standard designs procedures of DC/DC power converters involves the simulation of the whole converter, including analog power stage and digital control stage. Co-simulation of...
Aiming the great phase lag of the control-to-output small signal transfer function of LCC resonant converter, compensation networks composed of a band-stop filter and a single-pole-single-zero network are designed. Matlab and PSpice simulations are finished simultaneously, which verify that the output voltage can be regulated automatically in the disturbance of load changing. And good steady-state...
Compared with traditional load, power electronic load (PEL) has the advantages of flexible configuration and energy saving. After discussing the topology of singer-phase AC PEL, the design methods of main circuit parameters and control system are presented. And then, simulation waves of the system are given to show the feasibility and accuracy of the design.
A constant current output Flyback converter with power factor correction used for LED driving is presented in this paper. The inductor voltage detection method is applied and acquired the inductor voltage to generate the control signal. Based on this design principle, the inner loop of input current shaping is eliminating, the input voltage sensing and multiplier are also not necessary. The simulation...
This research is developed the electric vehicle by the fuel cell. Between fuel cell source and motor controller, we add new power converter, offer steady output voltage to motor controller and drive the direct current hub motor. Converter not only offers steady output voltage but it also combines with coupling inductance technology to battery charger. Besides offers energy to drive motor, and fuel...
The approach to electrical energy systems at all levels is undergoing large changes due to ever increasing demand for greater efficiency and improved power density. At the center of these systems are the power electronic converters that make efficient, flexible and controllable energy conversion possible. However, as power density and efficiency demands continue to increase, heat dissipation and cooling...
Unified power flow controller (UPFC) is one of the most advanced flexible AC transmission system (FACTS) devices that can simultaneously and independently control both the real and reactive power flow in a transmission line. The utilization of UPFC can result in significant reliability benefits in modern power systems. This paper proposes a novel reliability network model for a UPFC, which incorporates...
Active Front End converters (AFE) connect a DC link to a grid, usually with three phases. They allow energy flow in both directions, reduce grid-current harmonics, needed short-circuit power and non-active power in comparison to diode or thyristor-based devices. One more advantage, with is in the center of this paper, is the dynamic reaction to load variations combined with the need for robust control...
In this paper a novel online simulator is introduced that is integrated into the educational project iPES which is a free collection of Java applets for educational purpose. iPES has been translated into 12 languages and has currently more than 10, 000 visits per month. The novel online simulator is optimized for power electronics, easy to use, and allows unlimited simulation of converter topologies...
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