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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...
It is proposed in this paper a methodology to obtain optimal controllers gains for the rotor-side converter of doubly fed induction generators (DFIGs) using a genetic algorithm approach. The main objective is to enhance the operational security and robustness of the power system, by a more effective contribution of the DFIG controllers to the system controllability. To reach this goal, the crow-bar...
Three-level inverters and relative techniques have been concerned more and more in industrial drive applications because of the outstanding performance. The aim of this paper is to present a strategy for the sensorless vector control of Permanent Magnet Synchronous Motor (PMSM) drive fed with a three-level Neutral-Point-Clamped (NPC) inverter. By measuring the different current change rates which...
In this paper, various dynamic slip control topologies are proposed for the control of grid connected opti-slip induction generator (OSIG). An elegant technique based on rotor voltage measurement has also been presented for mitigating output power fluctuations from OSIG, due to sudden wind gusts, tower shadow effect, etc. The control of OSIG is achieved using the basic principle of chopper control...
This paper proposes a new speed sensorless direct torque and flux controlled interior permanent magnet synchronous motor (IPMSM) drive. Closed-loop control of both the torque and stator flux linkage are achieved by using two proportional-integral (PI) controllers. The reference voltage vectors are generated by a space vector modulation (SVM) unit. The drive uses an adaptive sliding mode observer for...
This paper proposes an improved current control scheme for the rotor-side converter of a doubly-fed induction generator (DFIG) wind power generation system. The control scheme consists of a proportional (P) controller and a harmonic resonant (R) regulator tuned at the grid frequency. Thus, the positive and negative sequence components of rotor current are fully regulated by the PR controller without...
This paper presents a marine generator control system which BDFM control winding side is controlled by commercial converter. Two problems of the commercial converter in control system is solved. One is the common commercial converterpsilas output voltage and frequency at constant V/F curve, the other is it canpsilat feedback energy to AC power. Based on generator voltage and frequency loop , we discuss...
A novel sensorless control for switched reluctance motor (SRM) driven by the three-phase full-bridge inverter is proposed. The most commonly used drive for SRM is the asymmetric half-bridge inverter but its main disadvantage is the cost due to the number of switches and diodes required to realized the drive, in comparison with the much cheaper and more widely available three-phase full-bridge inverter...
This paper presents a new solution, which can completely remove the DC offset and make the dynamic error of flux observation smaller when using the modified voltage model compensated by rotor flux oriented current model. The modified voltage model with error compensation not only completely eliminates the integration drift, but also realizes errorless flux estimation in steady state and dynamic state...
This paper presents the analysis and operation of doubly fed induction generator (DFIG)-based wind power generation system under unbalanced network voltage conditions. The limited voltage and current ratings, the control capabilities of both the grid-side and the rotor-side converter (GSC & RSC) for unbalanced network voltage compensation are investigated in detail. A new current control scheme,...
This paper presents a novel DC link voltage feedforward control to improve the electric drive system tolerance capability to the dc link voltage sag. A uniform mathematic model, comprising the battery packs, voltage source inverter (VSI), permanent magnet synchronous motor (PMSM) is built up in the d-q rotating coordinates rather in three-phase stationary coordinates. In order to study the influence...
Hybrid excitation synchronous machine(HESM) combines the characteristics of permanent magnet machine and wound field synchronous machine. A novel coordinate structure HESM is proposed and implemented in this paper. The architecture and operation principle of the novel HESM are presented. To predict the electromagnetic performance more accurately, 3D-FEA model of the HESM is built, and finite-element...
One position controlling source using sinusoidal wave by CPLD through linear amplifier technique for driving ring-type traveling-wave ultrasonic motor with 30 mm diameter of the stator (RTWUSM30) has been proposed and designed in this paper. The driving and controlling signals can be adjusted the frequency, the phase, the amplitude, and the phase difference of the two sin wave exciting signals through...
The active and reactive components of the power winding current were controlled by the control winding current, which could make power winding current only providing active current component, and the power winding supplying the dynamic torque. The exciting field for the power winding was completely provided by the control winding. On the basis of dq-rotating reference frame of brushless doubly-fed...
This paper presents the dynamic modeling, prediction, control and experimental aspects of a switched reluctance starter/generator (SRS/G) system. The proposed model utilizes the Fourier series in expression of current dependent arctangent function to characterize the relationship among phase current, rotor position, flux linkage and torque characteristics. Second, a simulation model along with their...
The calculation method of the no-load and on-load characteristic of reluctance brushless doubly-fed machine (RBDFM )is proposed based on tooth flux calculation. The tooth flux of RBDFM can be obtained by infinite-element calculation, and then the voltage value and waveform can be accurately calculated by the tooth flux value. The effects of the magnetic circuit geometry, saliency, saturation, winding...
Based on saliency tracking idea, a scheme based on high-frequency voltage signal injection is described to solve traditional problems at low speeds. For surface permanent magnet synchronous motor (SPMSM) which does not have structural saliency, a fluctuating high-frequency voltage signal injection scheme is presented. This scheme is realized by developing saturated saliency which has information about...
A method of sensorless vector control with unity power factor for surface mounted permanent magnet synchronous motor (SPMSM) is presented. The method can realize the motor control of unity power factor under the rated speed, and the motor can also work normally under high speed by way of field weakening. Comparing with the vector control of the statorpsilas magnetic force plumbs with the permanent...
The single current regulator algorithm has been proven robust for flux weakening control of surface-mount PM (SPM) machines with active control of d-axis current and a fixed value of q-axis voltage applied. This paper proposes a new method to optimize the q-axis voltage adaptive to variable speeds and torque based on the single current regulator algorithm for the deep flux weakening control of a 50...
Phase-locked loop (PLL) has been widely used in the doubly-fed wind power generation system (DFWG) to obtain the phase angle of the utility voltage accurately. But in weak power grid, the dynamic of PLL is coupled with DFWG controller and this may cause wind turbine system instability. This paper presents the impact of PLL on the DFWG system stability. In order to investigate the system stability,...
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