Power Electronics and Variable Frequency Drives

Bose, B.K.

doi:10.1109/9780470545553

Cited by 298 publications

(130 citation statements)

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“…Diversas investigações têm sido realizadas com vistas a esclarecer seus princípios, operação e desempenho sob diferentes condições de suprimento e carga, bem como os conteúdos harmônicos produzidos pela operação dos ASD's [Bose, 1997].…”

Section: Introductionunclassified

Conversores de freqüencia VSI-PWM submetidos a afundamentos temporários de tensão ("voltage sags")

Leao

Oliveira

Rodrigues

2003

Sba Controle & Automação

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This paper aims at analyzing the relationship between VSI-PWM frequency converters behavior and a very common type of power quality disturbance, i.e. the well known voltage sag effect. By using a proper model into the Saber Simulator, simulation results for a typical system under symmetrical and asymmetrical sag phenomenon conditions are shown. Experimental results are also given in order to validate the computational behaviour. The converter ride-through capability as well as the protection units interaction are also included into the analysis.

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Section: Introductionunclassified

Conversores de freqüencia VSI-PWM submetidos a afundamentos temporários de tensão ("voltage sags")

Leao

Oliveira

Rodrigues

2003

Sba Controle & Automação

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“…Although, by definition, the rms current and the power factor are steady-state quantities, the use of (3), (5), and (6) yields instantaneous measurements of both of them. This is a very important factor, since it gives continuous measurements that can be used for feedback purposes, allowing for better dynamics in the control.…”

Section: Stator Resistance Compensationmentioning

confidence: 99%

“…This method, however, gives poor results for several reasons; first, the measured current contains high-frequency noise that makes it difficult to identify the exact point of zero crossing, and second, the power factor measurement can only be updated, at most, every 1/6 of a cycle. These problems are eliminated by using (3), (5), and (6). The final expression for the required stator voltage, including only instantaneously measured and commanded quantities, is (7) Equation (7) corresponds to a vector compensation of the IR drop.…”

Section: Stator Resistance Compensationmentioning

confidence: 99%

“…Assuming a set of balanced sinusoidal currents, the rms value, in terms of instantaneous quantities, can be written as (3) The terms and are obtained by using a transformation similar to what is known as the complex vector form of real variables [17]. Defining the complex quantity (4) where is the complex number substituting the currents and using a synchronous reference frame yields (5) where is the peak current and the phase angle. Because of the trigonometric relation between sine and cosine and the structure of (2), only the real part of (5) is required, therefore, the actual implementation does not use complex variables and (5) can be simplified to (6) where has been replaced by the symbol to stress that only real quantities are used.…”

Section: Stator Resistance Compensationmentioning

confidence: 99%

See 1 more Smart Citation

A new induction motor V/f control method capable of high-performance regulation at low speeds

Munoz-Garcia

Lipo

Novotny

1998

IEEE Trans. on Ind. Applicat.

159

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Abstract-A novel open-loop speed control method for induction motors that provides high output torque and nearly zero steady-state speed error at any frequency is presented. The control scheme is based on the popular constant volts per hertz (V/f) method using low-cost open-loop current sensors. Only stator current measurements are needed to compensate for both stator resistance drop and slip frequency. The scheme proposed fully compensates for the current-resistance (IR) voltage drop by vectorially modifying the stator voltage and keeping the magnitude of the stator flux constant, regardless of changes in frequency or load. A novel slip frequency compensation, based on a nonlinear torque-speed estimate, is also introduced. This method reduces the steady-state speed error to almost zero. It is also shown that a linear torque-speed approximation is a special case of the nonlinear estimate and that it leads to large speed errors for loads greater than rated. It is shown that, by using the proposed method, the speed can be accurately controlled down to, at least, 1.2 Hz with load torques of more than 150% of rated value. Since the only machine parameter required, the stator resistance, is automatically measured at startup time, using the same pulsewidth modulated voltage-source inverter without additional hardware, the proposed drive also exhibits self-commissioning capability.

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“…Due to the problems with VM at low speeds, the rotor flux is here preferably estimated using the current model, while the voltage model is suitable at higher speeds, see e.g. [6], [7] and [8]. By combining CM and VM what is called Composite Model flux observer we tried to illustrate advantages of each individual at low and high speed performance using simulation in Matlab/Simulink.…”

mentioning

confidence: 99%