A Position Sensorless Control of Switched Reluctance Motors Based on Phase Inductance Slope

Cai, Jun; Deng, Zhiquan

doi:10.6113/jpe.2013.13.2.264

Cited by 32 publications

(20 citation statements)

References 16 publications

(15 reference statements)

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“…It can be seen that, higher conduction angles could lead to a larger output current. APC control can also be divided into the modes of changing θon, θoff and both θon and θoff together [27]. CCC is a method that directly chops the phase currents during the specific position of each phase.…”

Section: Control Methods Of Srgmentioning

confidence: 99%

Improvement of the Response Speed for Switched Reluctance Generation System Based on Modified PT Control

Zan

Cui

et al. 2018

Energies

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Abstract:The Switched Reluctance Generator (SRG) is suitable for wind power generation due to its good reliability and robustness. However, The SRG system adopting the conventional control algorithm with Pulse Width Modulation (PWM) method has a drawback, low response speed. The pulse train (PT) control has been widely used in dc/dc power converters operating in the discontinuous conduction mode due to its advantages of simple implementation and fast response. In this paper, for the first time, the PT control method is modified and adopted for controlling the output voltage of SRG system in order to achieve fast response. The capacitor current on the output side is sampled and combined with the output voltage to select the pulse trains and the low frequency oscillation cased by PT can be suppressed by tuning the feedback coefficient of the capacitor current. Also, good performance can be guaranteed with a wide range of voltage regulations, fast response, and no overshoot. The experimental platform of an 8/6 SRG system is built, and the experimental results show that the PT control can be used for SRG system with good practicability.

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Section: Control Methods Of Srgmentioning

confidence: 99%

Improvement of the Response Speed for Switched Reluctance Generation System Based on Modified PT Control

Zan

Cui

et al. 2018

Energies

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“…При принятых допущениях электромагнитные процессы в фазе ЭМ рассматриваемого типа описываются уравнением [1][2][3][4]:…”

Section: рис 2 зависимости индуктивности фазы статора от угла поворunclassified

“…При работе на высоких скоростях вращения нежелательно располагать электрогенератор в непосредственной близости от паровой турбины, т. к. это значительно усложняет конструкцию. Известны различные способы определения положения ротора вентильноиндукторной ЭМ без датчика положения [1][2][3][4]. Однако их использование для высокооборотного генератора требует учета ряда особенностей.…”

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“…В настоящее время для вращающихся вентильно-индукторных ЭМ разработаны принципы бездатчикового управления. Они отличаются использованием различных информационных признаков определения положения ротора [2][3][4]. В большинстве случаев такие решения не могут быть непосредственно использованы для высокооборотных генераторов.…”

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Sensorless control of the high-speed switched reluctance generator of the micro power plant

Kolpakhchyan

Olkhovatov

2020

Vestnik Donskogo gosudarstvennogo tehničeskogo universiteta

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Introduction. In the distributed and autonomous generation systems using renewable energy sources, low-power generating units (not more than 100-200 kW) based on microturbines function. Microturbines operate most efficiently at high rotational speeds. In this regard, the generator running with a microturbine must also be a high-speed one. A generator is a switched reluctance electric machine (EM) that needs information on the rotor position. It is difficult to use a position sensor in such mechanisms at high speeds. This paper discusses the issues of sensorless control of a high-speed switched reluctance electric generator in conjunction with a steam microturbine.Materials and Methods. So, it is required to evaluate the proof-of-principle developed to control a high-speed switched reluctance EM. For this purpose, a mathematical model has been created including models of the investigated EM, an electric power converter, and a control system. For the EM under consideration, the active resistance is determined, as well as the dependence of the phase flux linkage on the current flowing through it and the position of the moving element. The method used involves probing the idle phase of an electric machine with short voltage pulses of equal duration, and measuring the current in this phase. If the voltage pulse length is much shorter than the phase time constant, then the current pulse amplitude is inversely proportional to the inductance. Thus, registering the maximum current pulse amplitude, it is possible to determine the rotor passage through an uncoordinated position for the probed phase. This information is used to form control actions by other phases. Moreover, the length of the test voltage pulses, required to obtain current pulses sufficient for measuring the value, is of significance versus the duration of the pulsing time. Hence, with an increase in the rotational speed, the number of test pulses is insufficient for measuring the position with the accuracy required for the control goals. This reduces drastically the precision of determining the rotor position; therefore, at high speeds, the application of this method is limited without further refinement of the rotor position. In this case, to increase the precision of measurements, it is necessary to evaluate the rate of current rise when applying the basic voltage pulse or the voltage pulse rate forming the phase current before switching to a single-pulse control mode. Research Results. Two conclusions important for correcting the estimation of the rotor position in a single-pulse operation mode of a reluctance EM are proved. The first conclusion is on the efficiency of the proposed technique of filtering phase current measurement data, the second one concerns the applicability of the identified information criteria. The analysis results of the processes in the switched reluctance EM using sensorless control that implements the described principles for determining the rotor position are presented.Discussion and Conclusions. To correct the estimation of the rotor position, the following information criteria can be used: the presence of a pause between the excitation pulse and the start of the generation process; the decrease in current by the time the generation begins. To refine the estimate, the following fact can be used: on the generation interval, the current curve knee corresponding to the maximum phase inductance is observed at the same rotor position.

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“…However, the regional comparison method suffers from the influence of inductance saturation and can introduce position estimation errors in dynamic operation. The phase current slope difference based calculation method is utilized to identify the full-cycle inductance [20]. The position versus inductance characteristics is modeled to estimate the rotor position based on the inductance characteristics.…”

Section: Introductionmentioning

confidence: 99%

Variable Coefficient Inductance Model-Based Four-Quadrant Sensorless Control of SRM

Kuai¹,

Li²,

Li³

et al. 2014

Journal of Power Electronics

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The phase inductance of a switch reluctance motor (SRM) is significantly nonlinear. With different saturation conditions, the phase inductance shape is clearly changed. This study focuses on the relationship between coefficient and current in an inductance model with ignored harmonics above the order of 3. A position estimation method based on the variable coefficient inductance model is proposed in this paper. A four-quadrant sensorless control system of the SRM drive is constructed based on the relationship between variable coefficient inductance and rotor position. The proposed algorithms are implemented in an experimental SRM test setup. Experimental results show that the proposed method estimates position accurately in operating two/four-quadrants. The entire system also has good static and dynamic performance.

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A Position Sensorless Control of Switched Reluctance Motors Based on Phase Inductance Slope

Cited by 32 publications

References 16 publications

Improvement of the Response Speed for Switched Reluctance Generation System Based on Modified PT Control

Improvement of the Response Speed for Switched Reluctance Generation System Based on Modified PT Control

Sensorless control of the high-speed switched reluctance generator of the micro power plant

Variable Coefficient Inductance Model-Based Four-Quadrant Sensorless Control of SRM

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