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In this work it is presented a two-phase open-end winding induction motor (IM) driven by an improved current source inverter (CSI). The proposed inverter has independent full quadrant operation, lower DC-link current value, high magnetics power density, 25% more efficient and high AC output voltage waveform quality compared to conventional CSI solutions. A back-to-back AC-DC-AC current source converter...
This paper proposes the use of a novel three-phase PWM rectifier-inverter topology for doubly fed induction generator (DFIG) applications. The topology uses only nine IGBT devices for ac/ac conversion through a dc link. As compare to conventional back-to-back ac/ac converters, the numbers of power semiconductor switches are reduced in the suggested converter. The proposed topology results in reduction...
The paper reports unexpected failures of ultrahigh speed induction machine (USIM) supplied by PWM converter applied in a system developed for utilizing renewable and waste energies. Due to the high supply frequency of USIM the frequency ratio in the PWM converter was unusually low. The imperfect operation of the microcontroller commanding the PWM pattern generated subharmonics. It developed considerable...
Wind power is one of the common distributed generation in microgrid. According to the requirements of microgrid, permanent magnet synchronous wind generator (PMSWG) for wind energy distributed generation was designed in this paper and it has simple structure, easy control and low cost characteristics, non-controllable rectifier and grid-connected PWM convertor is adopted as the AC grid-connected circuit...
The aim of this paper is to present a three-phase 6×4 switched reluctance generator load voltage control. The showed strategy uses a PI controller to vary the magnetization level of the phases during the magnetization period using a PWM signal. This strategy was simulated and than tested in a bench. Results of both simulations and experimental tests are presented here. It was used a low cost fixed-point...
A novel back to back cascaded medium voltage converter is proposed for wind power generation. In the generator side, it is a H-bridge cascaded converter, which employs the vector control based on rotor flux orient to drive the medium induction generator. In the grid side, a series of two-level voltage source converters are used to support an isolated DC voltage for each H-bridge cell in the generator...
This paper presents a novel control approach of a current source inverter drive system using an induction motor. A variant of hysteresis-band current control adapted to the current source inverter circuit topology is proposed. The current control strategy is based on the correction of the two out of three larger errors of the instantaneous real currents of motor with respect to their references. The...
This paper proposes a control strategy for megawatt-level direct-drive wind energy conversion systems based on permanent magnet synchronous generators (PMSG). In the paper, a peak current model of zero-sequence current is derived and analyzed. The parallel-operation controllers are designed to restrain reactive power circulation and beat-frequency zero-sequence currents caused by discontinuous space-vector...
This paper deals with an isolated wind-hydro hybrid generation system employing one Permanent Magnet Synchronous Generator (PMSG) driven by hydro turbine and another PMSG driven by a variable speed wind turbine feeding three-phase four-wire local loads. The proposed system utilizes two back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors (IGBTs) based voltage source...
The novel contribution is the study of the impact of subharmonics generated by the PWM technique and by the imperfect operation of converters leading in some cases to the defect of ultrahigh speed induction machines (USIM). The problem is originated from an R&D work for industry. Results of numerical analysis of subharmonics are confirmed by computer simulations and laboratory tests. They are...
In sensorless drives, the reliability of the drive is increased by estimating the rotor position instead of measuring it. At low speed operation and standstill, most sensorless algorithms estimate the rotor position by measuring the response on test signals. This paper discusses a low-speed sensorless algorithm for a permanent-magnet synchronous machine (PMSM) that is supplied by a multilevel converter...
In this paper, a new control technology of doubly-fed induction machine based on the space current vector PWM (SCVPWM) strategy and current-source dual-PWM converter was presented, which can produce electrical braking torque to achieve four-quadrant operation; moreover, the reactive power of the stator side can be flexibly controlled and the harmonic distortions can be reduced by the control technology...
Present paper describes the design of a doubly fed induction generator (DFIG) test bench with active crowbar, using a PWM voltage-fed inverters connected between the grid and the rotor. A vector control scheme is proposed in order to control the power-side and the rotor- side of the converter. A control board, based on a digital signal processor (DSP) and a FPGA, has been developed to manage the overall...
The electric power generation using hydro potential is increasing around the globe due to many reasons like increasing power demand, deregulated markets, and environmental concerns etc. At the same time, extended transmission networks, higher degrees of interconnection between different networks, and fast connection and disconnection of the heavy loads demand flexible, fast power generation and consumption...
The impact of PWM technique on the operation of ultrahigh speed induction machines (USIM) applied to generate electric power by utilizing renewable energy resources has been studied. The analysis was focused on the subharmonics of PWM wave generating high losses in USIM. The novel contribution is the description of a new special approach for the determination of subharmonics, the presentation of its...
This paper presents a new integrated model for the simulation of wind power generation systems. This model is not only more accurate but also computationally acceptable. It uses pulse width modulation by space vector modulation associated with sliding mode for controlling the converters. Power factor control at the output of the converters is considered in the model. We present a case study showing...
This paper presents the implementation and design of a power converter for an autonomous wind self-excited induction generator (SEIG) feeding an isolated load through the employment of a DSP-based rectifier-inverter circuit. The output voltage and frequency of the studied wind SEIG is inherently variable due to random fluctuation of wind-speed variation. A three-phase constant-voltage constant-frequency...
This paper details the modeling, controller development, simulation and analysis of an integrated 2MW variable-speed Wind Energy Conversion and Storage System (WECSS) in dynamic simulation software PSCAD. The WECSS presented consists of a pitch controlled wind turbine directly driving a 2MW permanent magnet synchronous generator (PMSG). The PMSG is connected to its host power system via a controlled...
The developed switched reluctance starter/generator system in low voltage is presented, which is made up of the three-phase 12/8 structure double salient reluctance machine, three-phase asymmetric bridge single polarity power converter and the controller. The three-phase 12/8 structure double salient reluctance machine, the three-phase asymmetric bridge single polarity power converter and the control...
This study proposes a radial basis function network (RBFN) controlled three-phase induction generator (IG) system using ac-dc and dc-ac power converters. In this study, first, the indirect field-oriented mechanism is implemented for the control of the IG. The electric frequency of the IG is controlled using the indirect field-oriented control mechanism. Then, an ac-dc power converter and a dc-ac power...
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