SVPWM Control Research Articles

Power quality improvement in three-phase grid tied pv systems with 3-D SVPWM control active power filters

Power quality improvement in three-phase grid tied pv systems with 3-D SVPWM control active power filters

Study of SVPWM control algorithm with voltage balancing based on simplified vector for cascaded H-bridge energy storage converters

Study of SVPWM control algorithm with voltage balancing based on simplified vector for cascaded H-bridge energy storage converters

Design and development of single-phase inverter for locomotives based on SVPWM

For locomotive in high-power inverter power supply output efficiency is low, the level is not stable, push-pull circuit before the switch tube of high pressure, low utilization rate of the original winding transformer problem, designed and developed a kind of single phase inverter power supply based on SVPWM control. The inverter is designed with a modular structure with a rated power of 4KW, which is used to supply power to the cab electrical apparatus and auxiliary air compressor at both ends of the locomotive. It is composed of a filter circuit, a front-end boost control drive circuit, a full-bridge DC boost circuit, an inverter control circuit, a voltage and current sampling circuit, a back-end full-bridge inverter circuit and a protection circuit. The front stage of the inverter adopts a full bridge chopper circuit topology, while the rear stage achieves SVPWM control through the Vacon NXS control box. Finally, a power supply prototype was produced through simulation verification, and the results showed that the designed power supply met the design requirements.

Analyses, Modeling, and SVPWM Control of a Three-Level T-NPC Inverter to Reduce Common-Mode Voltage Under Open-Circuit Fault in a Neutral-Point Switch

Analyses, Modeling, and SVPWM Control of a Three-Level T-NPC Inverter to Reduce Common-Mode Voltage Under Open-Circuit Fault in a Neutral-Point Switch

Research on the Application of Motor Field-Oriented Control in Vehicles

The motor application of the FOC strategy of the hybrid system in this text is the battery heat control. The specific contents are as below: SVPWM control. SVPWM is based on the three-phase symmetrical sine wave voltage supply and three-phase symmetrical motor stator ideal flux circle as a reference standard, with different switching modes of three-phase inverter for appropriate switching, to form PWM wave and to form the actual flux vector to track its accurate flux circle. By applying reactive voltage with high-frequency variation and using the FOC control strategy, the inductance characteristic of the motor winding is constantly utilized to generate alternating current on the bus. By taking advantage of the high internal resistance of the cell at low temperatures, the joule heat is constantly generated on the cell. While avoiding the risk of lithium analysis of the cell, heat is generated from the cell itself, and the temperature of the cell is raised. The vehicle results are conducted and show that the battery heat performance is enhanced.

Chaotic ant colony algorithm-based frequency-optimized random switching frequency SVPWM control strategy

Chaotic ant colony algorithm-based frequency-optimized random switching frequency SVPWM control strategy

Analysis and Approximation of THD and Torque Ripple of Induction Motor for SVPWM Control of VSI

This article presents a harmonic analysis of the stator currents of a squirrel-cage induction motor fed by a voltage source inverter with PWM space vector control (SVPWM). The influence of PWM switching frequency and dead time (dead band) of controlled transistors on THD and electromagnetic torque ripple is shown. The aim is to determine the lowest switching frequency of the transistors for which the drive will operate correctly. Characteristics were determined as functions in the form of THD (fPWM), where the least square approximation was used for stator current measurements when the PWM switching frequency was changed. The approximations were realized for simulation and experimental results. To clarify the results, the operation of hardware PWM circuits in microcontrollers is analyzed.

Pulse Width Modulation Inverter Control Methods-A Comprehensive Study

Harmonics in electrical supply refers to the distortion of the normal electrical waveform due to the presence of frequencies that are multiples of the fundamental frequency. The presence of harmonics in electrical supply can lead to a number of problems, including: Overheating of equipment, Power quality issues, Extra energy consumption etc. This research aims to provide a cost-effective solution to reduce harmonics in three phase inverters and improve power factor without using any hardware components such as filters and multi-level inverters and by simply changing control pulses of the inverter switches. This research provides a comparison of three most popular inverter control techniques SPWM control, THPWM control and SVPWM control techniques of three phase inverters. All these techniques were compared with the help of MATLAB-SIMULINK and the best control technique with lower order harmonics and less power factor was determined.

An Enhanced Space Vector PWM Strategies for Three Phase Asymmetric Multilevel Inverter

This work presents the two space vector pulse width modulation (SVPWM-I and SVPWM-II) strategies for eleven-level (11L) asymmetric cascaded H-bridge (CHB) multilevel inverter (MLI). Depending on the isolated structure and nonappearance of capacitor voltage balancing issues, the CHB MLI structure is favoured. These days, the SVPWM control method is accomplished superior consideration among the diverse PWM methods. In common, the SVPWM strategy is realized based on deteriorating higher-level hexagons into a lower level hexagon (2-level). Compared to the classical SVPWM strategy, the proposed SVPWM-I strategy decreases the memory and mathematical burden necessity included within the demonstration of eleven-level SVPWM devoid of losing the inverter output voltage (AC) contour by diminution the number of two-level hexagons. Also, the SVPWM-II strategy is presented, which incredibly diminishes the mathematical endeavours. The presented two SVPWM methods performed on an eleven-level asymmetric CHB multilevel inverter (MLI) by utilizing SIMULINK/MATLAB program tool and are compared with conventional sinusoidal PWM and Third harmonic injection (THI) PWM methods to confirm the proposed SVPWM methods. The proposed SVPWM methods give higher AC RMS voltage and lower harmonic distortion when compared to SPWM and THIPWM methods. To validate the presented two SVPWM control schemes, hardware results are taken on asymmetric eleven-level CHB MLI.

Smooth Pulse Number Transition Strategy Considering Time Delay in Synchronized SVPWM

In high power motor drive systems, synchronized space vector pulsewidth modulation (synchronized SVPWM) is widely used to guarantee stable control performance. Synchronized SVPWM has a characteristic that the switching frequency varies abruptly when the pulse number transitions. This article proposes a pulse number transition point at which the phase difference is minimized to remove the phase difference of the sampling point that appears during synchronized SVPWM control. In addition, for a smooth pulse number transition of synchronized SVPWM, a compensation method for the magnitude and phase error of the inverter output voltage due to the time delay and a method of removing the existing phase difference without using a phase-locked loop are proposed in consideration of the characteristic of changing switching frequency. The validity and the implementation of the proposed method are verified by experimental results using a high-power inverter driving 332 kW interior permanent magnet synchronous motor (IPMSM).

Research on SVPWM control algorithm based on dual three-phase permanent magnet synchronous motor

Compared with the three-phase permanent magnet synchronous motor, the dual-three-phase permanent magnet synchronous motor has the characteristics of high reliability, small torque fluctuation, and strong fault tolerance, which is suitable for application in the fields of ships, aerospace, and electric vehicles. However, due to the presence of harmonic sub-spaces in dual-three-phase permanent magnet synchronous motors, small voltage distortions can lead to excessive harmonic currents. In this paper, the dual-three-phase permanent magnet synchronous motor is used as a research object, and a control algorithm is designed to suppress its harmonic current. The traditional 48-sector SVPWM does not take into account the simultaneous action of the three-phase bridge arm of the same group of inverters during sector conversion, so it generates a large harmonic current when sector conversion. Therefore, this paper proposes an improved 48-sector SVPWM, which makes a partial adjustment to the vector selection of each sector based on the traditional 48-sector SVPWM, so that the zero vector selection of each sector is the same, avoiding the situation that the same group of three-phase bridge arms acts simultaneously when the sector is converted. The basic principles of improving the 48-sector SVPWM are introduced in detail, and the simulation analysis is carried out in MATLAB, which verifies the correctness of the theoretical analysis in this paper. The results show that this algorithm not only inherits the advantages of the traditional 48-sector SVPWM that is easy to implement in hardware, but also further reduces the harmonic current of the stator.

Performance Investigation on Buck Boost Conveter with Induction Drive Using SVPWM Controller

This article presents a SVPWM technique for inverter with two levels to operate the IM drive (induction motor) with Buck Boost converter. SVPWM are increasingly gained importance in high power industrial drive applications. SVPWM technique is preferred in order to decrease the THD value, switching losses and ripples. If any fault occurs in the main supply, the Buck Boost converter which acts as a battery storage device is used as supply to continuously drive the induction without any interruption. The main advantage of Buck Boost converter is it has continuous flow of input current. In the proposed scheme, the two-level SVPWM technique strategy fed IM has been modeled and simulated using MATLAB/SIMULINK software.

A new type of microgrid power quality improvement strategy based on harmonic suppression

Current harmonics and distorted voltage are two important factors that affect the power quality of microgrids. Combining with the operating characteristics of microgrids, this article uses a new strategy to control grid-connected inverters and UPQC to improve grid quality. Pointed out its advantages relative to traditional active filters, and in view of the current harmonic detection problems, In this paper, the inverter adopts an improved ip-iq harmonic detection method to improve the accuracy of harmonic current detection and has strong interference. The UPQC structure uses SVPWM and PWM control methods as its new control strategies on the series side and parallel side to compensate for distortion voltage and harmonic current. A detailed model is built in MATLAB/Simulink to verify the feasibility of this method.

A New Control Approach of a Three-Phase Inverter Two Levels

In this paper, we present the study, modelling and simulation of the duty cycle modulation (DCM) based on SVPWM control technique using Matlab/Simulink software. It is one of the most advanced control techniques of space vector modulation (SVM), which can be used for controlling static converters or for controlling electrical machines to achieve better dynamic performance. DCSVM is a control technique that generates control signals for the two-level voltage converter as well as for the intermediate times. The main advantage of this control technique is the reduction of the number of calculations, especially for the trigonometric functions and the generation of the reference voltage. In order to reduce the computational effort, we have designed a DCSVM controller that is able to faithfully reproduce the same vectors and output quantities as a classical SVM. In order to test the functionality and validity of the DCSVM control, we have developed different simulations that result in a total harmonic distortion (THD) of the voltage and current of 41.19% and 15.19% respectively with fundamental values of 61.51 V for the voltage and 2.80 A for the current; in contrast to the SVM which gives 47.27 V for the voltage and 2.01 A for the current with THDs of 77.16% for the voltage and 16.00% for the current. This results in an improvement in the distortion rate of around 25.5%. The results obtained are very satisfactory. The DCSVM is a real competitor to the SVM and its various variants.

Virtual Space Vector Pulse Width Modulation for Asymmetric T-Type Neutral Point Clamped 3-Level Inverter

This paper proposes a novel 3-phase asymmetric 3-level T-type NPC inverter and studies its PWM performance using a virtual space vector pulse width modulation control strategy. Firstly, the mathematical model and characteristics of this economical topology are described. Then, a virtual space vector approach is proposed to build a space vector diagram for designing SVPWM control. Similar to the conventional 3-level NPC inverter, the asymmetric inverter can also work with the neutral point voltage self-balancing in a fundamental period, which enables employment of this topology in various applications. Finally, simulation and experiment results under different load conditions have shown good output performance of the asymmetric 3-level topology. Similar tests are also performed on both conventional 2-level and 3-level inverters for comparison. For an almost similar number of different voltage vectors in the space vector diagram, the asymmetric 3-level topology can compete with conventional 3-level inverters for low-cost applications. The obvious benefit of the asymmetric 3-level inverter is a smaller number of switches devices while it can achieve output performance similar to that of the conventional 3-level. The comparative investigation also shows that the total loss given by SVPWM for the asymmetric 3-level configuration is lower than that of the traditional 3-level inverter.

Realization of Low-Voltage and High-Current Rectifier Module Control System Based on Nonlinear Feed-Forward PID Control

The low-voltage and high-current permanent magnet synchronous generator (PMSG), which has characteristics of high power density, small size, and excellent energy saving, is representative of the generators. As a key module of the integrated DC output system of PMSG, the low-voltage and high-current rectifier module is also a nonlinear time-varying system that is readily influenced by parametric changes and external disturbances. Aiming at the shortcomings of traditional control strategies, this paper proposes a novel low-voltage and high-power rectifier module control strategy based on nonlinear feed-forward PID control. The controller has a wide range of environmental applications because of its greater robustness. At the same time, the introduction of feed-forward control shortens regulation time of the system. Therefore, the combination of the two control methods can improve the dynamic performance of the system without influencing the steady-state performance. The simulation model of an integrated rectifier system based on SVPWM control was constructed by Simulink, which can achieve a rated output of 5 V/300 A. At the same time, the simulation model of the controller is constructed and applied to the rectifier output system of a 5 V/300 A synchronous generator to complete the nonlinear feed-forward PID control. Through the comparison between simulation and experiment, it has been proven that the control method can effectively resist the load disturbances and improve the response speed of the system.

A fault tolerance method based on switch redundancy for shunt active power filter

In order to improve the reliability of the shunt active power filter(SAPF) system, the fault-tolerant control strategy of the system is studied in this paper. A fault-tolerant control strategy based on improved switch redundancy is designed inside SAPF system, and fault-tolerant is achieved through circuit reconstruction. Then the operating mode and voltage vector characteristics of the fault-tolerant topology are analyzed, and the corresponding SVPWM control algorithm is derived. Finally, experiments verify the practicability and effectiveness of the SAPF fault-tolerant control method proposed in this paper.

Optimization Method of Output Power Quality of Z-Source Inverter Based on SVPWM

A linear modulation of SVPWM control strategy employed in Z-source inverter is proposed in this paper. The DC bus voltage is regulated by adjusting the shoot through duty based on load. The reference voltage vectors are limited in the inscribed circle of hexagon of basic voltage vectors. Overmodulation is avoided. The linear relationship between the peak value of the output voltage and the DC bus voltage is kept in all regions. The change of system load is responded by this control strategy. The system control algorithm is simplified and the output capability of the system is enhanced. To validate its advantages, analytical, simulation, and experimental results are also presented.

Research on Three-phase PWM Rectifier based on Double Closed-loop Feedforward decoupling control

For rectifier link widely used traditional diode rectifier circuit and brake pipe phased rectifier circuit, resulting in net side current, voltage distortion, problem of higher harmonic and low power factor, and put forward a double closed-loop feed-forward decoupling control strategy, used in three-phase voltage source PWM rectifier was established in Matlab/Simulink simulation model, compared with traditional SVPWM control of three-phase PWM rectifier, verifies the correctness of the proposed control strategy. From the simulation results, it can be seen that the voltage on the grid side is nearly consistent with the phase of the current, which realizes the operation of unit power factor and makes the voltage on the DC side reach steady-state rapidly, thus reducing the harmonic pollution and improving the power quality, which has a good practical application effect in the power transformation.

Design and simulation of three-level SVPWM based on FPGA

After expounding the overall design of the three-level SVPWM principle and algorithm, the SVPWM top level module using FPGA is created. And A/D conversion module, the Clarke transformation module, the adjacent vector function time module and the triangle carrier module are also established. Quartus II is used to simulation. And compared with the simulation results of MATLAB, the simulation waveforms are consistent, which verifies the correctness of the simulation results. Taking the diode clamped three-level inverter as the research object, the simulation waveforms of the different modulation M are compared, and the correctness of the three-level SVPWM control strategy is further verified.