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Battery-supercapacitor hybrid energy storage systems are becoming popular in the renewable energy sector due to their improved power and energy performances. These hybrid systems require separate dc-dc converters, or at least one dc-dc converter for the supercapacitor bank, to connect them to the dc-link of the grid interfacing inverter. These additional dc-dc converters increase power losses, complexity...
The configuration of a single-phase three-level neutral point clamped (NPC) converter has been widely applied in high-speed railway electrical traction drive systems. This paper proposes a control and modulation scheme for the single-phase three-level NPC converter. Firstly, an active and reactive current decoupled control scheme in d-q synchronous frame is presented for single-phase three-level NPC...
With respect to the deficiency of the output modeling, topology modeling and switching function modeling of the STATCOM, this paper states the voltage regulating principle of the STATCOM and analyzes the switch characteristics of the voltage source converter controlled by the SPWM, then deduces the duty ratio of each switches based on the switching function. Then, introduces the switching system concept...
In this paper, the one-comparator counter-based pulsewidth-modulated (PWM) control strategy without any analog-to-digital converter (ADC), used in the DC-DC converter, is applied to the DC-AC converter with some modifications. In addition, the voltage reference feedforward control is applied so as to reduce the burden of the proportional integral derivative (PID) controller. Via some experimental...
Aimed at the fluctuate characteristics of isolated wind power system export voltage and frequency, apply the Space Vector Pulse Width Modulation technology, design the control system of small capacity converter. Build the rectifier and inverter model in Matlab/simulink environment and simulated. The results show that the converter base on the control of SVPWM can dampen the wind power system output...
This paper proposes a new topology for three-phase to three-phase cycloconverters. In the proposed topology, in order to generate the desired output voltage, the main states of switches are decreased in comparison with conventional topologies of three-phase to three-phase cycloconverters which can improve the performance of the cycloconverter. Increasing of the maximum output/input voltage transfer...
Development of high frequency power electronic devices leads to high performance and flexible switch mode AC voltage stabilizers instead of traditional electromechanical types. This paper introduces a novel double stage topology for switch mode AC voltage regulators. The system produces a continuous adjustable isolated AC voltage providing a constant output voltage for sensitive loads. In order to...
This paper highlights the voltage sag and swell of the power quality issue and Unified power flow controller (UPFC) is used for mitigation. The switching level model is constructed using three phase six pulse shunt and series converters. Both the converters are modeled as back to back voltage source inverters connected with the D.C link are controlled by sinusoidal pulse width modulation scheme. This...
This paper proposes a validation methodology for implementing solutions to challenges involved with power electronic converter design. Typically, the design process consists of first simulating the converter and then implementing it on hardware. Here, an intermediate step is added where the controller is connected to a real-time simulator before being connected to real hardware. This allows for virtual...
This paper proposes a control methodology for Superconducting Magnetic Energy Storage (SMES) unit, which can significantly decrease the voltage and power fluctuations of grid connected fixed speed wind generators. The SMES system with a voltage-source IGBT converter and two-quadrant DC-DC chopper using IGBT is proposed as a controllable energy storage device. The objective of the proposed SMES control...
This paper deals with the modeling and control of a three phase four wire autonomous Wind Energy Conversion System (AWECS) using Doubly Fed Induction Generator (DFIG) feeding local loads. It presents a procedure for design and selection of the components and a vector control algorithm for AWECS. The proposed control algorithm for AWECS is realized using back to back connected Pulse Width Modulated...
This paper proposes a microcontroller based control method for the maximum power point tracking (MPPT) of a photovoltaic system under variable temperature and insolation conditions. For the reduction of tracking time, fuzzy logic control algorithm is implemented with the embedded microcontroller for improved performance as compared to conventional techniques in power efficiency and swift maximum power...
A sub-1V CMOS DC-DC buck converter with 90% efficiency is presented in this paper. The proposed buck converter uses a digital error amplifier that can make the input voltage lower than other conventional buck converters. The buck converter uses voltage-mode control with pulse width modulation (PWM) techniques. The ramp generator of buck converter uses a Schmitt trigger circuit to replace the bias...
This paper presents a hybrid PWM strategy for dc-ac three-phase four-wire Z-source converters. The technique combines the theory of space-vector PWM with the ease of implementation of a triangular-comparison PWM. Such strategy reduces the effort of algorithm calculation. The introduction of the distribution ratio in this technique, allows the development of a systematic approach for implementation...
In this paper, a performance analysis of a dc-bus voltage regulation technique for parallel wind-based synchronous generators is presented. This technique is developed based on the voltage oriented control (VOC) algorithm for PWM converters. The proposed technique provides economic utilization of the wind generator by insuring unity power factor operation under different possible conditions. This...
An ac voltage regulating system of doubly Salient Electro-magnetic Generator has been performed in this paper. In order to maintain the high voltage 360VDC stable, the dual boost converter with fixed frequency PWM controlled is adopted. Three-phase dual buck inverter was adopted to output 115VAC/400Hz. the generating system configuration, control strategy of dual boost converter and three-phase dual...
Windowed ADC is an attractive solution for the high efficiency digitally-controlled converters. However its limited conversion range restricts the transient speed for the dynamic voltage scaling applications. For slew rate improvement, this work designed a multi-mode PI/PID controller incorporated with the windowed ADC operation. In addition, to make output stable with no limit cycling, a current-controlled...
In this paper is presented the structure and working principle of the cascaded H-bridge multilevel converter with PWM rectifier and phase-shift transformer. Using the leak inductance as the filter reactor of the PWM rectifier can reducing the volume and cost of the converter; the phase-shift secondary side of the transformer can eliminate the current harmonics caused by the single power unit, restraining...
This article, firstly, introduced the operating principle of variable speed constant frequency (VSCF) wind power generation based on a structure of dual PWM converter. Then the mathematical model of network-side and rotor-side converter was set up. Decoupling control and vector control technique were presented based on grid voltage orientation and stator flux orientation to simplify the control strategy...
The paper presents a nine-level selective harmonic elimination pulse width modulation (SHE-PWM) cascaded voltage source converter based STATCOM system. The structure allows direct connection to the grid without the need of any step-up transformers. The converter is controlled with the SHE-PWM technique which provides an elimination to lower order harmonics to improve output waveforms and furthermore,...
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