Space vector modulation

In this study, the simulation results concerning speed control of the induction motor by using a matrix converter have been given. The field oriented control technique was preferred while making speed control of the induction motor with a matrix converter. Over nominal speed, the flux has been weakened. Therefore, decreasing magnetic saturation and heat dissipation, torque production and drive efficiency were improved at the desired speed. In order to provide unity power factor for the running converter, the space vectors of input currents and output voltages were used in the matrix converter. By using the data taken from the controller, the required switching signals for the matrix converter has been produced. These signals have been taken by using the space vector pulse width modulation technique. Parameters of 4 kW induction motor have been used in the simulation process.

In this study, the simulation results concerning speed control of the induction motor by using a matrix converter have been given. The field oriented control technique was preferred while making speed control of the induction motor with a matrix converter. Over nominal speed, the flux has been weakened. Therefore, decreasing magnetic saturation and heat dissipation, torque production and drive efficiency were improved at the desired speed. In order to provide unity power factor for the running converter, the space vectors of input currents and output voltages were used in the matrix converter. By using the data taken from the controller, the required switching signals for the matrix converter has been produced. These signals have been taken by using the space vector pulse width modulation technique. Parameters of 4 kW induction motor have been used in the simulation process.

Since induction motors were invented, human civilization has changed forever. Due to their beneficial characteristics, induction motors are widely used and have become the most prevalent electrical counterparts. Many control strategies for induction motors have been developed, varying from scalar to vector control. In the class of vector control, the Direct Torque Control (DTC) was proposed as an alternative that ensures separated flux and torque control while remaining completely in a stationary reference frame. It offers direct inverter switching, reasonable simplicity than other vector control techniques, and less sensitivity to parameter variation. However, the use of hysteresis controllers in conventional DTC involves non-desired ripples in the system's flux and torque, which leads to bad system performances, primarily in low-speed operations. This paper aims to minimize the chattering and ensure the augmented system's performance in terms of robustness and stability. The proposed method is an improved version of DTC, which combines the addition of the Space Vector Machine (SVM) algorithm to the DTC and the increased number of DTC sectors that generate reference control voltages. Satisfactory results have been obtained by numerical simulation in MATLAB/Simulink. Eventually, the proposed method is proven to be a fast dynamic decoupled control that robustly responds to external disturbance and system uncertainties, especially in the low-speed range.

Since induction motors were invented, human civilization has changed forever. Due to their beneficial characteristics, induction motors are widely used and have become the most prevalent electrical counterparts. Many control strategies for induction motors have been developed, varying from scalar to vector control. In the class of vector control, the Direct Torque Control (DTC) was proposed as an alternative that ensures separated flux and torque control while remaining completely in a stationary reference frame. It offers direct inverter switching, reasonable simplicity than other vector control techniques, and less sensitivity to parameter variation. However, the use of hysteresis controllers in conventional DTC involves non-desired ripples in the system's flux and torque, which leads to bad system performances, primarily in low-speed operations. This paper aims to minimize the chattering and ensure the augmented system's performance in terms of robustness and stability. T...

The Voltage Source Converter (VSC) is the basis of STATCOMs and other power systems. It is composed of a three-phase inverter in which the activation of the switching devices must be controlled to generate the intended signals. The control technique used to switch the power devices affects the performance of the converter in terms of harmonic distortion mainly. Although some complex modulation techniques have been proposed in the related literature, local controllers opt for simpler methods as they provide robustness and they ease the implementation. In this paper, we propose a simple but effective technique to switch the transistors of a three-phase inverter with a Space Vector Modulation (SVM) supported by a Finite-State Machine (FSM). With this model, the switching technique can be easily implemented in low-cost microcontrollers with reduced memory and computational resources if code optimisation is performed. With an electrical analysis, we have designed a low-pass band filter a...

The MIMO-OFDM improves the link budget, simplifies the receiver and decreases the peak to average power ratio (PAPR) of a transmitting terminal. It includes multiple antennas for transmission and reception. The buffering and scheduling methodology of the data arrived from multiple antennas is very critical in reducing memory size and power consumption. This paper presents the Data Buffering, Scheduling methodology and their implementation for an eight parallel variable length Multipath Delay Commutator (MDC) FFT processor suitable for IEEE 802.11ac compliant MIMO-OFDM systems. It starts with a mathematical model for an 8 parallel variable length MDC FFT to understand the requirement of input buffer. Input buffer is required to park eight streams of the samples received serially at baseband processor and to schedule the ordered data onto eight channels such that the multimode FFT processing can be done efficiently and correctly. Proposed buffer can handle the data in four different orders for FFT core while operating in 512/256/128/64 point mode respectively. Proposed design consists of register banks, which can simplify the routing and save power. Also, this design is free from address conflict that may occur with SDRAM. The design is synthesized using TSMC 65nm library. The area and dynamic power results are presented for the implementation.

The classical sampling theorem, attributed to Whittaker, Shannon, Nyquist, and Kotelnikov, states that a bandlimited function can be recovered from its samples, as long as we use a sufficiently dense sampling grid. Here, we review the recent development of an operator sampling theory which allows for a "widening" of the classical sampling theorem. In this realm, bandlimited functions are replaced by "bandlimited operators", that is, by pseudodifferential operators which have bandlimited Kohn-Nirenberg symbols. Similar to the Nyquist sampling density condition, we discuss sufficient and necessary conditions on the bandlimitation of pseudodifferential operators to ensure that they can be recovered by their action on a single distribution. In fact, we show that an operator with Kohn-Nirenberg symbol bandlimited to a Jordan domain of measure less than one can be recovered through its action on a distribution defined on a appropriately chosen sampling grid. Further, an operator with bandlimitation to a Jordan domain of measure larger than one cannot be recovered through its action on any tempered distribution whatsoever, pointing towards a fundamental difference to the classical sampling theorem where a large bandwidth could always be compensated through a sufficiently fine sampling grid. The dichotomy depending on the size of the bandlimitation is related to Heisenberg's uncertainty principle. Further, we discuss an application of this theory to the channel measurement problem for Multiple-Input Multiple-Output (MIMO) channels.

In this paper, sliding mode control (SMC) e direct power controller (DPC) based active and reactive power controller for three-phase grid-tied photovoltaic (PV) system is proposed. The proposed system consists of two main controllers: the DC/DC boost converter to track the possible maximum power from the PV panels and the grid-tied three-phase inverter. The Perturb and Observe (P&O) algorithm is used to transfer the maximum power from the PV panels. Control of the active and reactive powers is performed using the SMC-DPC strategy without any rotating coordinate transformations or phase angle tracking of the grid voltage. In addition, extra current control cycles are not used to simplify the system design and to increase transient performance. The fixed switching frequency is obtained by using space vector modulation (SVM). The proposed system provides very good results both in transient and steady states with the simple algorithms of P&O and SMC-DPC methods. Moreover, the results are evaluated by comparing the SMC-DPC method developed for MPPT and the traditional PI control method. The proposed controller method is achieved with TMS320F28335 DSP processor and the system is experimentally tested for 12 kW PV generation systems.

In this paper, a switching vector transition control to increase the efficiency of permanent magnet (PM) AC motor drives in light HEVs (hybrid electric vehicles) and PHEVs (plugin hybrid electric vehicles) is presented. The conventional threephase PMAC motor drive activates all three phases, operating three switches in a six-switch inverter. In this work, a switching vector transition control, activating two phases and two switches in a speed range from zero to medium, is proposed to decrease switching power losses in PMAC motor drives. With the advantage of lower switching power losses, a smooth transition between two modes is presented as well. The proposed approach has been verified using a prototype experimental setup and the results have been discussed.

The smoothness-increasing operator "convolution" is well known for inheriting the best properties of each parent function. It is also well known that if f  L 1 and g is a Bounded Variation (BV) function, then f  g inherits the properties from the parent's spaces. This aspect of BV can be generalized in many ways and many generalizations are obtained. However, in this paper we introduce the notion of  p-Bounded variation function. In relation to that we show that the convolution of two functions f  g is the inverse Fourier transforms of the two functions. Moreover, we prove that if f, g  BV (p) [0, 2], then f  g  BV (p) [0, 2], and that on any locally compact Abelian group, a version of the convolution theorem holds.

Electrical and electronics engineering is a very broad and rich area hence this field is seperated in various fields. One of the important field is Electrical Machines and Power electronics. To begin with let us describe the ontological concepts of this field. As individuals, we can count conductors, semiconductors, magnetic fields, electrical fields, harmonics, swithes, permanent magnets, induction machines, motors, generators. Now let us define and describe the meanings of this concepts: Conductor: The material having zero resistance to electrical current. Semiconductor: The material having electrons and holes behaving in a quantum manner. Silicon, germanyum and elements like this. Magnetic Fields: The matematical field occouring between a North & South pole phenomena, according the right hand rule. Electrical Fields: The matematical field occouring because of current carrying wire. Harmonics: The spectrum content of mathematical function. Switches: The semiconductor elements used in converters inverters and drivers. Permanent Magnets: The materials used in electrical machines behaving through hysteresis and having a permaence defined as eddy currents and hysteresis loops. Induction Machines: The rotating electrical machines discovered by tesla which are widely used in every field of industry. Motors: The rotating electrical machines producing a torque when a voltage is applied. Generators: The rotating electrical machines producing a voltage when a torque is applied. Secondly let us talk about some of the properties and attributes. Resistivity, conductivity, magnetic field intensity, electrical field intensity, inductance, frequency, slip and so on. Again let us define and describe these concepts: Resistivity: The voltage current ratio of a material. Conductivity: The rate of transfering electrons through a material. Magnetic field intensity: The strength of a magnetic field. Electrical field intensity: The strength of an electrical field. Inductance: The resistance of an solenoid according to sinusodial electrical potantial. Frequency: The rate of change in a sinusoidal function simply number of waves propagating in a given time interval. Slip: The ratio between rotor and stator magnetic fields in an electrical machines. Now let us talk about some of the relationships on this field. Faraday equation, torque speed characteristics, voltage current characteristics, newton's law, ohm's law, kirchhoff's law, and so on. Again let us describe and define these concepts: Faraday equation: The relationship between mangetin and electrical fields in an electrical medium. Torque speed characteristics: The relation between rotational speed and potantial difference of a rotating electrical machine. Voltage current characteristics: The relationship between voltage and current in and electronical device. Newton's law: The law defining basic statistics of a physical structure. Ohm's law: The relation defining resistance of a material behaving in a current and voltage. Kirchhoff's law: The law that desribes the basic circuit concepts.

Pulse width modulation (PWM) is essential for voltage source inverters (VSI) to generate high-quality voltage outputs. Conventional deterministic PWM generates predictable harmonics, causing clusters that increase acoustic noise. Random PWM (RPWM) disperses harmonic power over a wider frequency range, reducing noise and electromagnetic interference. Many RPWM techniques improve inverter quality, but only partially suppress dominant harmonics and lack effective harmonic spreading. Most studies focus on simulations with limited FPGA implementation or hardware validation. The use of digital tools like VHDL, ModelSim, and MATLAB co-simulation remains underutilized. This paper proposes two-triangle RPWM strategies to enhance harmonic dispersion and reduce total harmonic distortion (THD). Co-simulation results are shown for both SPWM and RPWM, along with comparisons of fundamental voltages, THD, and HSF across different modulation indexes. Additionally, synthesis data for the Xilinx XC3S500E FPGA processor is supplied. The last section offers a comparative analysis and experimental validation of SPWM and RPWM. These techniques enable enhanced inverter performance, lower acoustic noise, and process innovations in power electronic systems.

Finite control set-predictive torque control (FCS-PTC) has emerged as a popular control method for induction motors (IMs) over the past decade. This paper provides a detailed hardware implementation of FCS-PTC with a constant weighting factor (WF) on 186 W of IM. The FCS-PTC is implemented using the DS1104 controller board programmed using C code. A comprehensive analysis of flux, torque, and the total harmonic distortion (THD) of the stator current is conducted and presented to establish a relationship between the WF and drive performance. The experimental results indicate that a higher WF results in improved performance in flux and THD current, but a poorer torque response. Conversely, a lower WF improves torque performance but sacrifices the flux and THD current. The analysis outcome will hopefully provide some guidelines for developing the WF selection techniques.

The paper investigates the impact of different space vector modulation (SVM) techniques on the operation of ultrahigh speed induction machines (USIMs), where the m f frequency ratio is low owing to the necessarily high fundamental frequency f 1 . Three different sampling techniques, the Regular Sampled, Naturally Sampled and the Oversampled are studied by simulation. It is found that the SVM is proned to generate DC current in the stator windings. Furthermore subharmonic flux and current components with considerable amplitudes can also be generated in USIM. In the paper it is revealed that both the DC and the subharmonic components could lead to extremely large additional losses in the USIM enhanced by its special parameters.

One possible implementation form of Space Vector Modulation is the Naturally Sampled (NS) one. Its favourable properties are that no distortion or delayed response are introduced by it. The aim of the paper is to introduce a digital method to implement NS SVM and compares its performance with the widely applied Regular and Doublesampled modulation form in a closed-loop speed sensor-less motor drive system. The paper focuses on the case when both the sampling over reference frequency ratio F and the carrier over reference frequency m f is low. The investigation covers two widely applied current measurement techniques.

Ackn owledgem e nts List of Symbo ls List of T a bles List o f Fig u res 1 Int rod u ctio n 1.1 Basic Concepts of Software Defined Radio Technology 1.2 Software Architecture of Software Defined Radio Receivers 1.3 Hardware Platforms of Software Defined Radio Receiver 1.3.1 Comparison of hardware platforms 1.4 A SDR Radio Receiver in DS-CDMAjOFDM Composite Radio Environment 3.6 Summary 4 Performance Analysis 4.1 Performance Analysis . . . . . I . 4.1.1 The Minimum Square Error (MSE) Analysisbf CIR Estimator 4.1.2 The MSE Analysis of Synchronization Parame~er Estimator 4.1.3 The Illustration of the Shift•and•correlation Procedure 4.1.4 The Illustration of the Proposed Estimation Algorithms. 4.1.5 Performance Analysis of the Proposed Receiver Structure.

The duty cycle space vector (DCSV) modulation strategy is of universal significance, and the method can be utilized for different modulation approaches. In this paper, the vectors of input voltages and currents are equivalently represented by a complex two-dimensional space vector, and the vectors of output voltages and currents are equivalently represented by two two-dimensional space vectors. Then, input–output relationships in both the d1-q1 space and the d3-q3 space are obtained. Because the desired output voltages are only mapped onto a reference voltage space vector in the d1-q1 space, the reference in the d3-q3 space is regarded as zero, in order to reduce harmonics of output voltages to the greatest extent. Then, the duty cycle space vector modulation strategy of the three-to-five phase direct matrix converter (DMC) is deduced. Considering the influence of the zero vector on system performance, the duty cycles are decomposed and recomposed to obtain the space vector pulse wi...

This paper deals with the performance analysis of three phase induction motor drive fed by SPWM inverter using different simulation technique in Matlab/Simulink. The performance of three phase induction motor drive represented in terms of inverter current, rotor and stator current, rotor speed, electromagnetic torque and total harmonic distortion (THD) in line voltage and phase current for modulation index Analysis is done using PI controller and fuzzy logic controller in close loop control of drive. After analysis of both controller the fuzzy logic controller give better performance than PI controller.

The reduced capability of the 5L-NPC Inverter to balance the voltages of the four DC-bus capacitors makes this converter unattractive for real power applications. This is especially true if the load demands active power. The Back-to-Back (B2B) configuration of two 5L-NPC converters and the use of a Space Vector Modulation (SVM) that exploits the voltage balancing capabilities of the redundant switching vectors, extend the operating conditions range in which a proper voltage balance can be achieved. However, if practical modulation restrictions are considered (limitation of voltage steps, dead times, switching losses, etc.) the voltage balance cannot be achieved for all operation conditions. This paper introduces the main restrictions that should be considered for the 5L-NPC modulation strategy. The voltage balancing limits of the proposed SVM scheme are shown and additional considerations to improve the voltage balancing capability are proposed and evaluated.

Let ω1 and ω2 be weight functions on R d , R d × R+, respectively. Throughout this paper, we define D p,q ω 1 ,ω 2 R d to be the vector space of f ∈ L p ω 1 R d such that the wavelet transform Wgf belongs to L q ω 2 R d × R+ for 1 ≤ p, q < ∞, where 0 = g ∈ S R d . We endow this space with a sum norm and show that D p,q ω 1 ,ω 2 R d becomes a Banach space. We discuss inclusion properties, and compact embeddings between these spaces and the dual of D p,q ω 1 ,ω 2 R d . Later we accept that the variable s in the space D p,q ω 1 ,ω 2 R d is fixed. We denote this space by D p,q ω 1 ,ω 2 s R d , and show that under suitable conditions D p,q ω 1 ,ω 2 s R d is an essential Banach Module over L 1 ω 1 R d . We obtain its approximate identities. At the end of this work we discuss the multipliers from D p,q ω 1 ,ω 2 s R d into L ∞ ω -1 1 R d , and from L 1 ω 1 R d into D p,q ω 1 ,ω 2 s R d .

This work aims to represent acceleration/deceleration ramps generator and a voltage/frequency control through a SCICOS block diagram for evaluation of values commonly used with electric vehicles. It was opted for the representation of functional block diagrams for implementing the models, and was adopted the free software SCILAB/SCICOS to design and to simulate the representations proposed. Also measurements from electric vehicle coupled to frequency inverter were done and compared to values obtained with simulations. The diagrams for the functions of acceleration/deceleration ramps and of V/f control was implemented, being fundamentals characteristics to simulate the operation of a frequency inverter for driving induction motors. Although the analysis was limited to these characteristics, in view of a variety of functions available on the inverter, the models were presented satisfactory to the representation of the basic characteristics of an inverter in the scalar configuration.  ...

The work presented in this paper aims to compare the effectiveness of different control strategies to improve the performance of the three-phase Induction Motor (IM). The Conventional Direct Torque Control (CDTC) was employed as the first strategy for driving the IM. This control strategy causes high ripples in the IM's torque and speed due to the hysteresis comparators and a variable switching frequency due to the look-up table . A modified DTC strategy based on Space Vector Modulation (DTC-SVM) was chosen as a second strategy to enhance the performance of the IM using the two-level inverter. This method, which leads to the reduction of the torque and speed ripples and achieves constant switching frequency. As the multi-level inverter becomes most popular than the twolevel inverter, the third strategy is devoted to adopting the three-level flying capacitor inverter (TLFCMLI) -based DTC-SVM. The third strategy uses the method of mapping the multi-level space vector based on basic two-level SVM. Matlab/Simulink software package is utilized to implement the suggested controllers. Simulation results show that the DTC-SVM based on TLFCMLI significantly enhances the IM's performance compared with the other two strategies from the voltage and current profiles, torque, and speed points of view. 

This paper presents the speed control scheme of an indirect vector-controlled induction motor (IM) drive. PWM controlling scheme is based on Voltage source inverter type space vector pulse width modulation (SVPWM) and the Conventional-PID controller or Fuzzy-PID controller is employed in closed-loop speed control. Decoupling of the stator current into torque and flux producing (d-q) current components model of an induction motor is involved in the indirect vector control. The torque component Iq current of an IM is developed by an intelligent-based Fuzzy PID controller. Based on settling time and dynamic response the performance of the Fuzzy Logic Controller is compared with that of the PID Controller to sudden load changes. It provides better control of motor torque with high dynamic performance. The simulated design is tested using various toolboxes in MATLAB. Simulation results of both controllers are presented for comparison.