induction motor speed control by the use of adjustable voltage adjustable frequency step wave 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 ... to the high slew rates (i.e fast switching times) of the switching of modern power devices, the switching trajectories of the current and voltage waveforms are often distorted by the presence of...
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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 ... degree of the grid cycle where f is the grid frequency The dc-offset voltage of vc is changed automatically according to the load conditions When the resonance frequency is equal to the grid frequency, ... generated by the MERS To control the terminal voltage as mentioned in above sections, there are two choices of operating point By selecting the lead power factor area, the MERS unites the voltage control...
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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
... for speed control B Control System In order to control the terminal voltage, voltage feedback with PI control is proposed The control part starts with sensing the line to line voltage Only two voltage ... 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 ... 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...
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Life cycle assessment (LCA) of an energy recovery plant in the olive oil industries
... is used for the extraction of oil contained in dry pomace Before the extraction process, the process of distillation of the pomace oil separates the hexane from the oil and allows the sale of the ... 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 ... 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 voltage since ... can be controlled by controlling the phase of the current in relation to the connecting grid voltage Load control using series compensation is illustrated in Fig The load voltage can be controlled...
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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 ... reactance voltage by MERS is extremely large in the latter case due to the very high reactance voltage A low speed switching IGBT can be used for the MERS system because the switching frequency of MERS ... factor regardless of the impedance and power frequency of the load, and it generates voltage and compensates for the synchronous reactance voltage So, the output voltage of the generator increases,...
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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
... 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 voltage such that maximum ... (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 ... in the not-continous mode the capacitor voltage goes to zero during each cycle As a result of the control, the MERS can act as a variable capacitor The size of the capacitive injected series voltage...
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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 ... 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 ... experimental waveforms of current and voltage of the load The repetition rate is kHz Since the capacitors are charged with a DC power source, the voltage is 24 V right after Fig Experimental waveforms of...
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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 ... plotted for both the case with and without limitation control For the case without control, the voltage quickly passes the voltage limit By using the limitation control, the maximum voltage can be ... 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
... maintain the voltage within the range of several percent On the other hand, the capacitor of MERS only stores the energy of one cycle The capacitor of MERS discharges all of its charge and the voltage ... 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 ... becomes zero Therefore, the total size of capacitors is reduced by using MERS In other words, dividing off the capacitor of MERS from the capacitors of the inverter power supply can reduce the total...
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Design and Implementation of a Three-Phase Induction Motor Control Scheme
... 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 ... 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 ... section of the design must interrupt the speed of the rotor based on the number of pulses it receives The rated speed of the induction motor used in this thesis project is 1500rpm, which is 25 rps Therefore,...
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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 ... 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 ... 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...
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SIMULATION AND SPEED CONTROL OF INDUCTION MOTOR DRIVES
... 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 ... 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 ... Closed Loop V/f speed control method The basis of constant V/f speed control of induction motor is to apply a variable magnitude and variable frequency voltage to the motor Both the voltage source...
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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 ... the similar plots of (5) and (6) in mode which are at higher voltages Note that the curves are not symmetrical because of saturation The saturation of in sector mode is eviat dent from the waveforms ... that, in the PWM waves of the odd , or , states appear as pulsed waves and sector states appear as notched waves (see Fig 4) On the other hand, in , or states appear as notched waves the even...
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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 ... they not have associated dynamic delays The sliding surfaces should therefore be dependent on the average values of the ‘ab’ components of the reference voltages In this case the controller frequency ... current control error ∆i o = i o, ref − i o , the output voltage vector vo has to be in the same direction as ∆i o because of the inductive character of the load In order to achieve this aim the...
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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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