induction motor speed control by the use of adjustable frequency pwm inverters
Power electronics and motor control SECOND EDITION W. SHEPHERD L. N.HULLEY D. T. W. LIANG
... 11 Induction motor speed control by the use of adjustable voltage, adjustable frequency step-wave inverters 11.1 Three-phase induction motor with controlled sinusoidal supply voltages of adjustable ... Hence, if the stray capacitance is of the order of picofarads and the stray inductance is of the order of microhenries, it can be seen that the frequency will be in the range of MHz Also, the slowest ... inverters with induction motor load 11.3.1 Motor currents 11.3.2 Motor losses and efficiency 11.3.3 Motor torque 11.3.4 Worked examples 11.4 Problems 12 Induction motor speed control by the use...
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Tài liệu tiếng anh Điện tử công suất mạch MERS Improved performance of induction motor using magnetic energy recovery switch
... the power source and the switching can be controlled The principle of the operation of the MERS is resonance between the capacitor of the MERS and the inductance of the load There are three operation ... ratings of induction motor depends on the maximum torque Although constant output power should be within the rated power, the MERS can make full use of the induction motor (5) When a = 900 + , the ... improved by reduced terminal voltage [5] The MERS can also improve the efficiency by the same method One of differences with other technologies is the MERS with induction motor can increase the terminal...
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Tài liệu tiếng anh Điện tử công suất mạch MERS A new automatic voltage regulator of self excited induction generator using SVC magnetic energy recovery switch
... can be achieved by controlling the current flowing to the dc capacitor by applying appropriate gate signals The control is based on performing a phase shift of the gate signals The control variable ... rms value of the line voltage is compared to the reference voltage The error is given to the PI controller to determine the phase, and then it is fed to the gate controller to generate the gate ... base frequency is 1500 rpm Capacitor voltage (V) −10 A Constant Speed Condition In the case of constant speed, the induction generator speed is kept at 1500 rpm The load is connected to induction...
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Life cycle assessment (LCA) of an energy recovery plant in the olive oil industries
... process, the process of distillation of the pomace oil separates the hexane from the oil and allows the sale of the pomace oil in the economic market In Table the inventory for kg of the finished ... methodology is based on the identification of energy and materials used and emissions released to the environment The core of the concept is the assessment of the impacts at each stage of the product life ... impact because the heat is produced by the recovery of the hot exhaust gases in the energy plant Therefore there is a saving equal to 0.05 kgCO2eq per kg of deoiled pomace produced In the RDF combustion...
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Tài liệu tiếng anh Điện tử công suất mạch MERS Feasible series compensation application using magnetic energy recovery switch
... influence on the flow of power Control of the size of the MERS voltage is performed by controlling the minimum capacitor voltage and the length of the by- pass period [9], by utilizing the active by- pass ... MERS is operated to control the phase of the injected voltage of the phase of the current When being used in power transmission, it is more important to control the size of the injected series ... dependent on control set-point • When operated in dc-offset mode, the control of gate signals will automatically control the phase of the current [2] Depending on the application, the control will...
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Tài liệu tiếng anh Điện tử công suất mạch MERS Improved wind power conversion system using magnetic energy recovery switch MERS
... disregarded because the switching frequency is the same as the generator Moreover, there is no loss of the filter because a filter on the converter input side is unnecessary The total loss of the power ... because the switching frequency of MERS is the same as a frequency of the generator Further improvement in efficiency of power conversion system with MERS would be realized if the combination of ... a 3.7-kW squirrel cage induction motor The rotation speed of the induction machine is controlled by an inverter to simulate fluctuations of a wind IAS 2005 Fig Overview of 3-phase MERS modules...
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Tài liệu tiếng anh Điện tử công suất mạch MERS Loss and rating consideration of a wind energy conversion system with reactive compensation by magnetic energy recovery switch
... will drop and the power output is limited (Fig 4(b) On the other hand, the MERS can cancel the voltage drop across the synchronous reactance and control the phase of the current along the internal ... power increased The operation principle of the MERS is based on controlling the path of the current through the device(Fig 2) Examples of resulting curves are shown in Fig Two modes of operation ... (Fig 4(c)) By controlling the size of the MERS voltage, the output power can be adjusted for a given speed and dc-voltage Experiments In order to evaluate and confirm the performance of the MERS...
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Tài liệu tiếng anh Điện tử công suất mạch MERS Power supply for pulsed magnets with magnetic energy recovery current switch
... turned off In steady state, the current is determined by the resistance and the voltage of the circuit charged in the capacitor is given by The voltage (1) where off is the current which was flowing ... than the theoretical value given by (2), presumably because the current decreases by on-resistance of MOSFET and switching loss B Current Waveform Control It is required to control the current ... is (6) The voltage applied to the load is given by (7) and the current is raised to In steady state, is determined by the resistance and the voltage source as Exploiting the advantage of Marx...
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Tài liệu tiếng anh Điện tử công suất mạch MERS Series connected power flow control using magnetic energy recovery switch
... control the minimum dc-capacitor voltage and to control the size of the zero voltage area The control is illustrated in Fig The control of the minimum capacitor voltage, Vc,min, is achieved by ... zero For this case, the voltage across the capacitor will be zero for parts of the period The control of the by- pass area will then directly result in the the GCSC same operation as for C Series ... is achieved the q-current will be a good estimation of the rms value of the current Another important task for the primary control system is to make sure that the voltage limits of the devices...
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Tài liệu tiếng anh Điện tử công suất mạch MERS Voltage rating reduction of magnetic power supplies using a magnetic energy recovery switch
... inductance of the magnet and is the capacitance of the MERS In general, it is much shorter than the time constant of the load In mode (a), the current flows through the MERS and only the voltage of the ... hand, the capacitor of MERS only stores the energy of one cycle The capacitor of MERS discharges all of its charge and the voltage becomes zero Therefore, the total size of capacitors is reduced by ... pulsed output The size of the capacitors relates to the voltage rating of the power supply Therefore, voltage rating reduction causes decreasing of the DC capacitors In general, the DC capacitors...
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Design and Implementation of a Three-Phase Induction Motor Control Scheme
... x-axis Usually, the speed operation of the motor has an upper limit that is equal to the rated speed of the motor Operation of the induction motor above the rated speed affects the drive efficiency ... develop a control strategy that varies the frequency and voltage of the signal applied to the windings of the induction motor, while controlling the flux created in the air-gap of the induction motor ... by the motor The other three are used in the “current controller” section of the design from the speed error signal These PI controllers regulate the voltage into the induction machine by making...
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SINUSOIDAL PWM OPERATION OF AN AC INDUCTION MOTOR CONTROLLER
... frequency of the fundamental sine wave of the PWM determines the frequency of the output voltage of the inverter The frequency of the carrier triangle wave of the PWM determines the frequency of the ... Synchronous speed = 120 (frequency) / (number of poles), the motor speed can be varied by the frequency The actual speed of the motor shaft is determined by the load which sets a slip in the motor AC MOTOR ... determines the frequency of the output waveform to the motor The frequency of the carrier triangle wave of the PWM determines the frequency of the transistor switches in the inverter and the resulting...
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SIMULATION AND SPEED CONTROL OF INDUCTION MOTOR DRIVES
... development of speed control methods of an induction motor have increased the use of induction motors in electrical drives extensively In this paper, we have studied the various methods of speed control ... to the magnetic field produced by the stator and the flux produced by the stator is proportional to the ratio of applied voltage and frequency of supply Therefore, by varying the voltage and frequency ... in most of the electrical drives But the recent developments in speed control methods of the induction motor have led to their large scale use in almost all electrical drives Out of the several...
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Tài liệu A neural-network-based space-vector PWM controller for a three-level voltage-fed inverter induction motor drive doc
... and IAS member of the Neural Network Council He has been a Member of the Editorial Board of the PROCEEDINGS OF THE IEEE since 1995 He was the Guest Editor of the PROCEEDINGS OF THE IEEE “Special ... training data were generated by simulation of the conventional SVM algorithm The angle training of the network was performed in the full cycle with an increment of The training time was typically ... to slow acceleration The machine has a speed- senwhich is evident from the figure The low sitive load torque switching frequency of the inverter gives large ripple torque of the machine V CONCLUSION...
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Tài liệu AC Induction Motor Fundamentals docx
... of the terminal voltage of the motor and the motor design As the motor accelerates, both the torque and the current will tend to alter with rotor speed if the voltage is maintained constant The ... FOR THE ELECTRICAL DRIVE Apart from the nonlinear characteristics of the induction motor, there are various issues attached to the driving of the motor Let us look at them one by one Earlier motors ... (e.g., in the case of lowering of loads under the influence of gravity) The speed and accuracy of stopping or reversing operations improve the productivity of the system and the quality of the product...
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Chapter 13 induction motor drives
... is the length of the coil into the page, and r is the radius of the coil Clearly, the magnitude of the torque is maximized when the current vector (defined perpendicular to the surface of the ... system, speed or position control is dramatically simplified because the electrical dynamics of the drive become irrelevant to the speed or position control problem In the case of induction motor ... neighborhood of synchronous speed, and so the electrical rotor speed will be near to the electrical frequency Thus, by controlling the frequency, one can approximately control the speed The second observation...
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Direct control methods for matrix converter and induction motor
... damping of oscillations of the input current which arise from the low cutoff frequency of the input filter and the relatively low switching frequency of the converter To complete the input current control ... be dependent on the average values of the ‘ab’ components of the reference voltages In this case the controller frequency has to be much higher than the desired output and input frequency in order ... account that the output currents of the matrix converter are impressed by the inductive load The input currents are generated from the output currents via the present switch configuration of the converter...
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Scientific report: "The potential energy recovery from landfills and evaluate the environmental benefits of the generation system using gas from landfills in Nam Son landfill, Vietnam" docx
... capacity of 6MW The lifetime of power plant is projected for 20 year In the case of LFG flow excess the design capacity of generator, the gas redundancy should be treated and sale for nearby site Other ... ways used to evaluate the theoretical production of methane from MSW landfill This study uses the theoretical model for evaluating of LFG emission The model is based on the first order decay ... results are not so different due to a stable component of waste and the time of refuse of each cell The result of analyzing samples is around 50% of CH4 in LFG (53% CH4 concentration in average level)...
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Scientific report: "The potential energy recovery from landfills and evaluate the environmental benefits of the generation system using gas from landfills in Nam Son landfill, Vietnam" pps
... capacity of 6MW The lifetime of power plant is projected for 20 year In the case of LFG flow excess the design capacity of generator, the gas redundancy should be treated and sale for nearby site Other ... ways used to evaluate the theoretical production of methane from MSW landfill This study uses the theoretical model for evaluating of LFG emission The model is based on the first order decay ... results are not so different due to a stable component of waste and the time of refuse of each cell The result of analyzing samples is around 50% of CH4 in LFG (53% CH4 concentration in average level)...
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