共查询到20条相似文献,搜索用时 31 毫秒
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Inductance model-based sensorless control of the switched reluctance motor drive at low speed 总被引:2,自引:0,他引:2
A sensorless control scheme for the switched reluctance motor (SRM) drive at low speed is presented in this paper. The incremental inductance of each active phase is estimated using the terminal measurement of this phase. The estimated phase incremental inductance is compared to an analytical model, which represents the functional relationships between the phase incremental inductance, phase current, and rotor position, to estimate the rotor position. The presented sensorless control scheme requires neither extra hardware nor huge memory space for implementation. It can provide accurate rotor position information even as the magnetic characteristics of the SRM change due to aging. Combined with other inductance model-based sensorless control techniques, the proposed method can be used to develop an inductance model-based sensorless control scheme to run the SRM from standstill to high-speed. Simulation and experimental results are presented to verify the proposed scheme. 相似文献
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Baike Shen Mwinyiwiwa B. Yongzheng Zhang Boon-Teck Ooi 《Power Electronics, IEEE Transactions on》2009,24(4):942-951
This paper presents an invention, the rotor position phase lock loop (PLL), which enables maximum power point (MPPT) tracking of wind by doubly-fed induction generators without needing a tachometer, an absolute position encoder, or an anemometer. The rotor position PLL is parameter variation insensitive, requiring only an estimate of the magnetization inductance for it to operate. It is also insensitive to noise in the electrical measurements. Proof of concept is by: (1) digital simulations and (2) experimental testing of a laboratory prototype. 相似文献
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Accurate rotor position detection and sensorless control of SRM for super-high speed operation 总被引:2,自引:0,他引:2
Longya Xu Chuanyang Wang 《Power Electronics, IEEE Transactions on》2002,17(5):757-763
Based on the general nonlinear magnetizing model (GNMM) from our previous research work, an improved method of detecting rotor position for sensorless control of SRMs in super-high speed operation has been developed. With minimum input data, the approximated GNMM is obtained and the rotor speed estimated. Then the rotor position is detected by the motion equation. To remove rotor position error, the proposed scheme updates the reference at critical points using the flux observation. Further, the GNMM is adaptively tuned based on the updated information. The improved rotor position detection method has been implemented by fully exploring the computation power of the modern DSP. Laboratory verification on different types of SRMs with sensorless control up to 20000 rpm is accomplished. 相似文献
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基于瞬时无功理论的传统有源滤波器在三相四线制电路中不适用,文章针对这个问题,综合运用瞬时无功理论中的p-q方法和ipi-q方法,提出了一种新的基于瞬时无功理论的有效的三相四线制谐波检测新方法,将三相电流中的零序电流剔除,完善了p-q方法和ip-iq方法的不足,通过计算验证了该方法适用于任何三相电路,包括三相四线制电路,并且三相电压波形的畸变不影响检测结果的准确性。并用MATLAB仿真验证了该方法的准确性和有效性。该方法有效地解决了传统有源滤波器不适用于三相四线制电路的缺陷。 相似文献
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A method is presented for fast response control of the torque and flux of a grid connected wound rotor induction machine fed by back to back connected voltage source inverters on the rotor side. It is based on the measurement of active and reactive power on the grid side where voltages and currents are alternating at fixed frequency. The active and reactive powers are made to track references using hysteresis controllers. The method eliminates the need for rotor position sensing and gives excellent dynamic performance, as shown by simulation and experimental results from a variable speed constant frequency induction generator system. It is also capable of starting on the fly. It is thus an attractive sensorless control method for drive as well as generator applications 相似文献
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A novel, robust DSP-based indirect rotor position estimation for permanent magnet AC motors without rotor saliency 总被引:2,自引:0,他引:2
This paper proposes and implements a novel rotor position sensorless technique for PM AC motor drives, which allows acceleration from standstill and can operate under various practical operating conditions including transient speed changes. The technique developed here relies on the measurement of the phase voltages and currents of the motor. It uses the incremental values of flux linkage, and the back-EMF functions to estimate incremental rotor position. Using a phase-locked loop (PLL) algorithm, an internal closed-loop correction algorithm can correct rotor position estimation drift, which may be due to the motor parameter variations or measurement inaccuracies. The method is implemented in closed-loop using a digital signal processor (DSP), and details of the implementation are provided in the paper. To demonstrate accuracy, robustness and reliability of the position estimation scheme, the paper presents a number of real-time experimental results, including dynamic operating conditions. 相似文献
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This paper presents a new dual loop control using novel vector product phase locked loop (VP-PLL) for a high power static var compensator (SVC) with three-level GTO voltage source inverter (VSI). From a simple dq-axis equivalent circuit obtained by circuit DQ-transformation method, steady-state analysis is achieved for maximum controllable phase angle αmax per unit current between AC source and switching function of inverter. In addition, the system parameters L and C are designed and thus transient analysis is made for open-loop transfer function. This paper proposes software VP-PLL for more accurate α control than conventional hardware PLL because αmax becomes very small in high power SVC. Therefore, the overall controller has dual loop structure of inner VP-PLL for synchronizing the phase angle with AC source and outer Q-loop for compensating reactive power of load. Finally, the usability of the proposed control method is verified through the experiment of 100kvar power capacity with both stand alone and load linked operation. 相似文献
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DFIG-Based Power Generation System With UPS Function for Variable-Speed Applications 总被引:1,自引:0,他引:1
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Maiti S. Chakraborty C. Hori Y. Ta M.C. 《Industrial Electronics, IEEE Transactions on》2008,55(2):594-601
In this paper, a detailed study on the model reference adaptive controller (MRAC) utilizing the reactive power is presented for the online estimation of rotor resistance to maintain proper flux orientation in an indirect vector controlled induction motor drive. Selection of reactive power as the functional candidate in the MRAC automatically makes the system immune to the variation of stator resistance. Moreover, the unique formation of the MRAC with the instantaneous and steady-state reactive power completely eliminates the requirement of any flux estimation in the process of computation. Thus, the method is less sensitive to integrator-related problems like drift and saturation (requiring no integration). This also makes the estimation at or near zero speed quite accurate. Adding flux estimators to the MRAC, a speed sensorless scheme is developed. Simulation and experimental results have been presented to confirm the effectiveness of the technique. 相似文献
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针对经典的李氏指数法(Lyapunov Exponential Method)等混沌相变判别方法复杂度高的问题,提出了一种应用锁相环技术判别混沌相变的新方法.首先,理论推导了混沌系统的解析特性,分析了系统在不同相态下含有的频率成分;然后,构建了针对混沌系统的数字锁相环模型,研究锁相环下混沌态和大周期态呈现的频率特性;最后,提出了一种基于锁相环技术的混沌相变判别新方法.仿真实验显示,相比于李氏指数法,所提方法判别速度快一个数量级,检测差错率为0时,性能提高近2 dB.新方法应用锁相环技术,简便易行,判别速度快,为混沌相变判别的工程应用提供了新的手段. 相似文献
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ABSTRACTThis paper presents a current source inverter (CSI)-based hybrid power generation system, which uses wind turbine and photovoltaic cells (PVs). A permanent magnet synchronous generator (PMSG) is connected to the CSI using a diode rectifier and a buck converter that is used to control the speed of the rotor. Another buck converter is used to control the maximum power point tracking of PVs. The operation of proposed system is studied under normal and grid voltage dip conditions. According to new grid codes, most power generating units are supposed to remain connected to the grid during voltage sag conditions and inject reactive current to grid as defined by grid codes. The CSI has fault current limiting capability that makes it appropriate to use in grid-connected applications and during voltage sag conditions in particular. The proposed system tracks the maximum power point of wind turbine and PVs under normal mode and injects required reactive current to the grid during voltage drop. However, incorporation of CSI with the inherent behaviour of wind turbine and PVs causes fault current to be within the tolerable range for power electronic devices. Simulations are carried out by using PSCAD/EMTDC software to verify the proposed system. 相似文献
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Parallel processing inverter system 总被引:5,自引:0,他引:5
Kawabata T. Sashida N. Yamamoto Y. Ogasawara K. Yamasaki Y. 《Power Electronics, IEEE Transactions on》1991,6(3):442-450
A novel method of instantaneous voltage and power balance control of a parallel processing inverter system is proposed. It consists of a high-speed switching PWM (pulsewidth modulated) inverter with an instantaneous current minor loop controller, a voltage major loop controller, and a power balance controller. This system realizes the following functions with only one inverter: constant AC output voltage control with reactive power control, active filtering to absorb load current harmonics, DC voltage and current control as AC-to-DC converter, and uninterruptible power supply (UPS) for stand-alone operation. This system covers a wide application range, including UPS systems, new energy systems, and active filters with voltage control functions 相似文献
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为提高开关电源控制芯片使用灵活性,优化对开关电源效率、纹波等性能的控制,并方便噪声滤除,提出一种带锁相环的多模式时钟发生电路芯片的设计。该电路可提供选择1.7MHz或2.6MHz的固定频率模式或锁相范围500kHz~3MHz的外部输入模式,应用于开关电源控制芯片时,可根据开关电源的应用情况设置工作频率,达到性能最佳化。该芯片已在1.5μmBCD(Bipolar-CMOS-DMOS)工艺下设计完成。测试结果表明芯片工作正常,预期的功能均已实现,可作为模拟电路IP使用。 相似文献
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A thorough analysis of a scalar control method for the operation of direct frequency changers (DFC) using bidirectional switches operating at high switching frequencies is proposed. The method allows full control over voltage and frequency at the output port and the input side power displacement factor, with little effect on the frequency spectrum of either the output voltage or input currents. The method uses the instantaneous voltage ratio of specific input phase voltages to generate the active and zero states of the various switches. A voltage transfer ratio as high as 0.87 is obtained under synchronous and asynchronous operation with a conventionally connected three-phase load. Analysis shows that the input power displacement factor is independent of load characteristics. The power displacement can be precisely controlled by proper adjustments of the timing sequence. Synchronization error in the timing sequence affects both the input power displacement and the voltage transfer ratio 相似文献
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Resolver sensor based angular position and speed sensing are extensively used in safety critical servo applications that demands accurate as well as high-resolution position and speed information for feedback control. In this paper, a novel scheme for position and speed sensing along with fault detection and identifications of a resolver sensor with systematic errors like magnitude imbalance, imperfect quadrature, and inductive harmonics is presented. The proposed scheme of resolver-to-digital (R/D) conversion mitigates the errors in position and speed estimate due to these common resolver imperfections and provides fault indicators such as good resolver signal, degradation of signal, and loss of signal for fault tolerant operation and diagnosis of malfunctions in the sensor system for safety critical systems. The proposed method incorporates software generation of the resolver carrier using a digital filter for synchronous demodulation without unintended time delay of the processed outputs, in such a way that there is substantial saving in hardware, for instance, carrier oscillator and associated digital and analog circuits for amplitude demodulators. The R/D converter incorporates an adaptive phase-locked loop (APLL) that accurately estimates the angular position and speed for a large range of operation along with superior tracking performance under dynamic conditions. Also, it provides the estimate of the magnitudes of the resolver outputs, estimate of the imperfect quadrature, and indication of harmonic distortion in the sensing angle, which can be used to directly access the quality of the resolver sensor system. Computer simulations and experimental results demonstrate an accurate R/D converter with adaptive capabilities to mitigate all the major systematic disturbances with reduced hardware complexity. 相似文献