Modern power electronics and ac drives pdf


 

Modern Power Electronics and AC Drives. Bimal K. Bose. Condra Chair of Excellence in Power Electronics. The University of Tennessee, Knoxville. Modern Power Electronics and AC Drives Steven_Pressfield_Do_the_Work_Overcome_Resistan(b-ok_xyz).pdf DTW_Layout_v12_indd saranya. Modern Power Electronics and AC Drives Views 28MB Size Report. DOWNLOAD PDF Practical Variable Speed Drives and Power Electronics. Read more.

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Modern Power Electronics And Ac Drives Pdf

Modern Power Electronics and AC Drives - Bimal K. Bose. Diunggah oleh. Còi Huy · Power Semiconductor controlled Drives - Gopal K goudzwaard.info Diunggah. Request PDF on ResearchGate | On Jan 1, , Bimal K Bose and others published Modern Power Electronics and AC Drives. (c) >>> page 1 of 8 PDF File: 57f74a Modern Power Electronics And Ac Drives By Bimal K. Bose EBOOK.

Downloads Description For upper level undergraduate and graduate level courses in electrical engineering, as well as a reference book for professionals and researchers. This text presents the basics of electrical power conversion and control through the use of power semiconductor switches. In addition, by demonstrating the practical applications of power electronics and motion control using AC electrical machines in transportation and industry, among other uses, Modern Power Electronics and AC Drives reflects the latest advances in industrial automation. Features State-of-the-art coverage-Of power electronics and motor drive technology. Gives students the latest information available on power electronics, as well as the practical applications of the technology to provide motion control in factories, transportation systems, and pump and blower dryers. Individual chapters-On the intelligent control of drives through the application of Artificial Intelligence techniques such as expert systems, fuzzy logic, and neural networks. Gives students insight into the future of power electronics. Power electronics and drives in energy conservation-And their role in protecting the environment. Provides students with a comprehensive overview of the potential value of power electronics in addition to their obvious practical applications. List of Principal Symbols. Power Semiconductor Devices. Large Band-Gap Materials for Devices. AC Machines for Drives.

Static Kramer Drive. Static Scherius Drive. Scalar Control. Vector or Field-Oriented Control. Sensorless Vector Control. Adaptive Control. Self-Commissioning of Drive. Synchronous Reluctance Machine Drives.

Wound-Field Synchronous Machine Drives. Sensorless Control. Expert System Principles. Expert System Shell. Design Methodology. Fuzzy Sets. Fuzzy System. Fuzzy Control. General Design Methodology. Fuzzy Logic Toolbox. The Structure of a Neuron.

3 BK Bose Modern Power Electronics and AC Drives Pearson Education 3 rd Reprint

Artificial Neural Network. Other Networks. Neural Network in Identification and Control. Neuro-Fuzzy Systems. Demo Program with Neural Network Toolbox. Pearson offers special pricing when you package your text with other student resources. If you're interested in creating a cost-saving package for your students, contact your Pearson rep.

BOSE is recognized worldwide as an authority and pioneer in the field of power electronics and drive technology. We're sorry! We don't recognize your username or password.

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Modern Power Electronics and Ac Drives B.K.bose

You have successfully signed out and will be required to sign back in should you need to download more resources. Out of print. Bimal K. Bose, University of Tennessee, Knoxville. If You're an Educator Additional order info. If You're a Student Additional order info. Description For upper level undergraduate and graduate level courses in electrical engineering, as well as a reference book for professionals and researchers. State-of-the-art coverage —Of power electronics and motor drive technology.

Individual chapters —On the intelligent control of drives through the application of Artificial Intelligence techniques such as expert systems, fuzzy logic, and neural networks.

Gives students insight into the future of power electronics. Power electronics and drives in energy conservation —And their role in protecting the environment. Therefore, the AC output voltage is not controlled by the inverter, but rather by the magnitude of the DC input voltage of the inverter.

The fundamental component of the AC output voltage can also be adjusted within a desirable range. Since the AC output voltage obtained from this modulation technique has odd half and odd quarter wave symmetry, even harmonics do not exist.

Any modulating technique used for the full-bridge configuration should have either the top or the bottom switch of each leg on at any given time. Due to the extra leg, the maximum amplitude of the output waveform is Vi, and is twice as large as the maximum achievable output amplitude for the half-bridge configuration.

The AC output voltage can take on only two values, either Vi or —Vi. To generate these same states using a half-bridge configuration, a carrier based technique can be used. Unlike the bipolar PWM technique, the unipolar approach uses states 1, 2, 3 and 4 from Table 2 to generate its AC output voltage.

Therefore, the AC output voltage can take on the values Vi, 0 or —V [1]i.

To generate these states, two sinusoidal modulating signals, Vc and —Vc, are needed, as seen in Figure 4. The phase voltages VaN and VbN are identical, but degrees out of phase with each other. The output voltage is equal to the difference of the two phase voltages, and do not contain any even harmonics. Therefore, if mf is taken, even the AC output voltage harmonics will appear at normalized odd frequencies, fh. These frequencies are centered on double the value of the normalized carrier frequency.

This particular feature allows for smaller filtering components when trying to obtain a higher quality output waveform. Switches in any of the three legs of the inverter cannot be switched off simultaneously due to this resulting in the voltages being dependent on the respective line current's polarity.

States 7 and 8 produce zero AC line voltages, which result in AC line currents freewheeling through either the upper or the lower components. However, the line voltages for states 1 through 6 produce an AC line voltage consisting of the discrete values of Vi, 0 or —Vi. In order to preserve the PWM features with a single carrier signal, the normalized carrier frequency, mf, needs to be a multiple of three. This keeps the magnitude of the phase voltages identical, but out of phase with each other by degrees.

In applications requiring sinusoidal AC waveforms, magnitude, frequency, and phase should all be controlled. CSIs have high changes in current over time, so capacitors are commonly employed on the AC side, while inductors are commonly employed on the DC side. In its most generalized form, a three-phase CSI employs the same conduction sequence as a six-pulse rectifier.

At any time, only one common-cathode switch and one common-anode switch are on. States are chosen such that a desired waveform is output and only valid states are used. This selection is based on modulating techniques, which include carrier-based PWM, selective harmonic elimination, and space-vector techniques. The digital circuit utilized for modulating signals contains a switching pulse generator, a shorting pulse generator, a shorting pulse distributor, and a switching and shorting pulse combiner.

A gating signal is produced based on a carrier current and three modulating signals. The same methods are utilized for each phase, however, switching variables are degrees out of phase relative to one another, and the current pulses are shifted by a half-cycle with respect to output currents.

If a triangular carrier is used with sinusoidal modulating signals, the CSI is said to be utilizing synchronized-pulse-width-modulation SPWM. If full over-modulation is used in conjunction with SPWM the inverter is said to be in square-wave operation.

Utilizing the gating signals developed for a VSI and a set of synchronizing sinusoidal current signals, results in symmetrically distributed shorting pulses and, therefore, symmetrical gating patterns. This allows any arbitrary number of harmonics to be eliminated. Optimal switching patterns must have quarter-wave and half-wave symmetry, as well as symmetry about 30 degrees and degrees.

Switching patterns are never allowed between 60 degrees and degrees. The current ripple can be further reduced with the use of larger output capacitors, or by increasing the number of switching pulses.

Valid switching states and time selections are made digitally based on space vector transformation. Modulating signals are represented as a complex vector using a transformation equation. These space vectors are then used to approximate the modulating signal.

If the signal is between arbitrary vectors, the vectors are combined with the zero vectors I7, I8, or I9. Normal operation of CSIs and VSIs can be classified as two-level inverters because the power switches connect to either the positive or the negative DC bus. Control methods for a three-level inverter only allow two switches of the four switches in each leg to simultaneously change conduction states.

This allows smooth commutation and avoids shoot through by only selecting valid states. Carrier-based and space-vector modulation techniques are used for multilevel topologies. The methods for these techniques follow those of classic inverters, but with added complexity. Space-vector modulation offers a greater number of fixed voltage vectors to be used in approximating the modulation signal, and therefore allows more effective space vector PWM strategies to be accomplished at the cost of more elaborate algorithms.

Due to added complexity and number of semiconductor devices, multilevel inverters are currently more suitable for high-power high-voltage applications. AC converters that allow the user to change the frequency are simply referred to as frequency converters for AC to AC conversion.

Because turning the switches on and off causes undesirable harmonics to be created, the switches are turned on and off during zero-voltage and zero-current conditions zero-crossing , effectively reducing the distortion. The power electronic components that are typically used are diodes, SCRs, and Triacs. With the use of these components, the user can delay the firing angle in a wave which will only cause part of the wave to be in output.

In order to improve these values PWM can be used instead of the other methods. What PWM AC Chopper does is have switches that turn on and off several times within alternate half-cycles of input voltage. They are commutated direct frequency converters that are synchronised by a supply line.

Modern Power Electronics and AC Drives

The cycloconverters output voltage waveforms have complex harmonics with the higher order harmonics being filtered by the machine inductance. Causing the machine current to have fewer harmonics, while the remaining harmonics causes losses and torque pulsations. Note that in a cycloconverter, unlike other converters, there are no inductors or capacitors, i.

For this reason, the instantaneous input power and the output power are equal. The single-phase high frequency ac voltage can be either sinusoidal or trapezoidal. These might be zero voltage intervals for control purpose or zero voltage commutation. Both positive and negative converters can generate voltage at either polarity, resulting in the positive converter only supplying positive current, and the negative converter only supplying negative current.

With recent device advances, newer forms of cycloconverters are being developed, such as matrix converters. The first change that is first noticed is that matrix converters utilize bi-directional, bipolar switches. A single phase to a single phase matrix converter consists of a matrix of 9 switches connecting the three input phases to the tree output phase. Any input phase and output phase can be connected together at any time without connecting any two switches from the same phase at the same time; otherwise this will cause a short circuit of the input phases.

Matrix converters are lighter, more compact and versatile than other converter solutions. As a result, they are able to achieve higher levels of integration, higher temperature operation, broad output frequency and natural bi-directional power flow suitable to regenerate energy back to the utility. The matrix converters are subdivided into two types: direct and indirect converters. A direct matrix converter with three-phase input and three-phase output, the switches in a matrix converter must be bi-directional, that is, they must be able to block voltages of either polarity and to conduct current in either direction.

This switching strategy permits the highest possible output voltage and reduces the reactive line-side current. Therefore, the power flow through the converter is reversible. Because of its commutation problem and complex control keep it from being broadly utilized in industry. Unlike the direct matrix converters, the indirect matrix converters has the same functionality, but uses separate input and output sections that are connected through a dc link without storage elements.

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