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This work describes a novel modeling and simulation approach of brushless DC motor control system depended on analysis of it's mathematical model. The brushless DC motor ontology model, the voltage type inverter circuit model, the hysteresis current tracking comparative model and the PID speed controller model were constructed in the Simulink environment of Matlab. S-function was used in modeling...
The DC current rejection of a single phase half-bridge grid-connected inverter with a line-frequency isolation transformer is researched in this paper. The impact of the magnetic dc bias of the transformer is given out from the mathematic model of the transformer in current-mode control. For the half-bridge current-mode inverter, the dc current rejection method is presented based on the relationship...
The direct-drive wind power generation system based on permanent magnet DC motor is researched, and the converter models of generator side and power network side is analyzed in detail. The system consists of a permanent magnet DC motor- generator set, a rectifier of high power factor, a boost converter and a full power inverter. The practical wind speed is simulated by the change of motor speed which...
The saving energy with train operation is more important than before from the view points of the global environment. However the energy saving design on the traction equipments sometimes has a trade off relation against the down sized and lighter weight traction equipments. In this paper, an optimizing method of the generic algorithm is applied to the numerical simulation to calculate the consuming...
This paper presents three models for dynamic analysis of inverter-based distributed generators equipped with voltage positive-feedback anti-islanding protection. The models analyzed are: the switched model, where the switches are represented in details, the average model, where the switches and signal generators are replaced by controlled voltage sources, and the small-signal model, where the average...
In this paper the operation of 50 kW PEM fuel cell system as distributed generation is studied. The objective of this work is to develop the modeling and control framework for such distributed generation to enable their operation in a distribution system. A new control strategy for the operation of the fuel cell system in both grid connected and islanded modes is proposed to enable better management...
This paper presents the design of a low-power 7 GHz two-stage VCO for UWB systems using a 0.13 ??m CMOS technology with supply voltage of 1.2 V. Fully differential structure is utilized to achieve high substrate noise rejection and a new formula is derived which accurately estimates the VCO output frequency as a function of control voltage. The VCO has very large tuning range (4.22 GHz), covering...
The paper presents a complete mathematical analysis of a sinusoidal BLDC motor commutation. The motor is supplied from a DC source via a 6-leg inverter using the 120degON operation. The commutation period of 60 electrical degrees is divided into two sub-periods, for which the corresponding differential equations are solved using the initial and final conditions. The obtained model is simple to apply;...
Direct-drive wind power system needs a full-scale power converter to transmit the variable frequency electrical power to the grid. In order to improve the low voltage ride through (LVRT) capability, the grid-connected inverter (GCI) should work at a unity, a leading or a lagging power factor. Traditional control methods are complicated and output waveform is distorted by dead time. This paper introduces...
This work deals with methods of design for the appropriate selection of a stand-alone photovoltaic power system for residential application in the absence of utility power supply. For a prescribed power demand design includes the determination of required number of photovoltaic (PV) panels and the proper total size of batteries to store part of the day collected energy for night or to supply power...
In wind power generation system the grid-connected inverter is essential device for energy conversion and transmission, of which the performance has a direct influence on the entire wind power generation system. The inductance of AC side affects the static and dynamic performance of the whole system when the grid-connected inverter is actively inverting. So the design of inductance of AC side is essential...
This paper introduces an H-bridge VSI inverter for the fifteen-phase induction motor. The systempsilas controller is based on the dSPACE real-time system. PWM generator module is based on the FPGA system which is interfaced with the dSPACE prototyping board DS4201. The control strategy in the Simulink is designed which considers the third harmonic component injection in the stator voltage. Combining...
A novel hybrid control based on digital variable-band hysteresis discrete pulse modulation (DPM) control and repetitive control is proposed for a 400 Hz inverter. The good dynamic response of the DPM inverter is obtained by the digital hysteresis control, and the steady state control performance is improved significantly by the repetitive control. By utilizing the variable hysteresis band, the stability...
To improve the output performance of cascaded H-bridge multilevel inverter under faulty conditions, this paper presents an optimized method suitable for harmonic cancellation while the faulty inverter are operated with neutral shift. With some parameters adjusted according to the fault type, the line to line voltages of the cell-fault inverter are increased than traditional control method, while keeping...
A significant problem with neutral-point-clamped three-level inverters is the fluctuation in the neutral-point voltage. When three-level inverter is loaded, the neutral-point voltage leads to the distortion on output voltage space-vector waveform of the inverter. A novel and simple judge rule based on the virtual space-vector is introduced. The mathematics models of neutral-point circuit and neutral-point...
To develop and apply renewable energy, one of the key technologies is that a kind of inverter outputting high quality sinusoid signals to power network is required. This paper proposed a three-phase buck-boost inverter, which can generate a three-phase ac output voltage larger than the dc input one. Its basic configuration is introduced, and the system stability of open-loop is analyzed by constructing...
The matrix rectifier described in this paper can realizes three-phase AC voltages to a DC output voltage and can work as a power factor correction converter. The paper presents an SPWM control strategy based on virtual DC link for AC/DC matrix rectifier with high frequency link. The matrix converter in the paper can be equivalent to a virtual rectifier and a virtual inverter. The proposed control...
This paper analyzes the necessity of PLL-controlled circuit for series resonant inverter in high frequency induction heating power supply and proposes an improved frequency tracking circuit. Model of series resonant inverter based on MATLAB/Simulink is established. The simulation results indicate that this circuit can keep the power-factor angle just changing within an acceptable range. It can guarantee...
Renewable energy power generation technology, such as wind power and PV system, has developed rapidly nowadays. The wind/PV hybrid system has become a promising power generation form due to the natural complementary character of wind power and PV power. Storage devices are usually equipped in the hybrid system to constitute Micro-grid through appropriate energy management strategies to improve the...
Through analyzing the shortcomings of the control system on the traditional cutting inverter, this paper presents the double close loop control system based on pole assignment for cutting inverter, which based on phase shift full bridge zero voltage switched (PS-FB-ZVS). This paper builds the small signal mode of PS-FB-ZVS PWM converter, and assigns the double close loop PI parameters by pole assignment...
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