Overview of Low Switching Frequency Control of High Power Three-Level Converters

Fu, Xin; Dai, Peng; Yuan, Qingqing; Wu, Xiaojie

doi:10.1007/978-3-642-21747-0_113

Cited by 5 publications

(6 citation statements)

References 20 publications

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“…In case of PTC, the trajectory of the flux vector tip is predicted for all vectors and the applied voltage vector is selected according to the predicted flux vector tips. This is calculated by the cost function (4). The result of the cost function calculation represents the difference between the predicted torque and flux values and their references.…”

Section: Resultsmentioning

confidence: 99%

“…Because the switching losses are significant in high-power drives, the low switching frequency of the transistors must be used. In some applications, this average switching frequency can go as low as 500 Hz for IGBT inverter [4]. In this low switching frequency operation, it is necessary to ensure that all applied switching combinations have effect in the desired way.…”

Section: Introductionmentioning

confidence: 99%

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Induction Motor Drive Direct Torque Control and Predictive Torque Control Comparison Based on Switching Pattern Analysis

Karlovsky

Lettl

2018

Energies

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This paper describes a switching pattern generated in case of induction motor drive predictive torque control (PTC) compared to a switching pattern of direct torque control (DTC). PTC is a modern control method for electric drives based on model predictive control (MPC). DTC is a very powerful method and is today an industrial standard for controlling an induction motor drive. Its usage is wide-spread, mainly in high-power applications. However, the method suffers from a few disadvantages. One of the causes of the control method's problematic behavior is choosing the switching combinations in the flux sector. Another inconvenience is the common selection table not including all voltage vectors in given sector. By these factors, the ripples of flux vector trajectory and torque waveforms are influenced. The longer the sample time is, the more significant the influence of factors becomes, because only a few steps occur within one turn of the magnetic flux vector. Based on the detailed analysis, the reasons of the different performance of both systems are explained. The analysis performed by simulation in Matlab Simulink environment has proved that, while DTC might choose voltage vector that pushes system away from the reference values, the MPC always chooses the most proper vector. The experimental results measured on the real drive confirm the appropriate vector selection, just in case of the predictive control method.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Induction Motor Drive Direct Torque Control and Predictive Torque Control Comparison Based on Switching Pattern Analysis

Karlovsky

Lettl

2018

Energies

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“…The waveforms of sga1, sga2, (sga1-sga2), and |sga1-sga2| under Cr = 6 are shown in Figure 7, and the Fourier transformation is conducted to show their spectrum. A simulation is conducted to investigate the influence caused by the absolute operation in (4). The waveforms of s ga1 , s ga2 , (s ga1 -s ga2 ), and |s ga1 -s ga2 | under Cr = 6 are shown in Figure 7, and the Fourier transformation is conducted to show their spectrum.…”

Section: Mechanism Three-the Undesired Harmonic Order When Cr Nears An Even Integermentioning

confidence: 99%

“…There will be only one switching in one fundamental period. Nevertheless, SHEPWM and the square wave mode are difficult to be compatible with the vector control, which has better dynamic performance [4]. Moreover, SHEPWM is more complicated to realize because it needs pre-calculated angles.…”

Section: Introductionmentioning

confidence: 99%

A Systematic Study on the Harmonic Overlap Effects for DC/AC Converters under Low Switching Frequency Modulation

Wang

Gao

2021

Energies

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In most high power industrial applications, the low switching frequency modulations (LSFM) are usually implemented to reduce power loss and heat dissipation pressure. However, there are some unexpected influences caused by the low order harmonic sinusoidal pulse width modulation (SPWM), such as the imbalanced submodule power in cascaded half-bridge inverter (CHB) and limited output power capability in H-bridge neutral-point-clamped (HNPC) converter. This paper starts by generalizing the basic characteristic of two-level SPWM, then deeply investigates the influences of low-frequency modulation on the operation of the circuits. They are classified into three mechanisms and generally named as harmonic overlap effect (HOE). The corresponding solutions to copy with the mechanisms are proposed and verified in some topologies through high-power simulations in simulations. In addition, a comprehensive summary of the influences and solutions of these effects on typical high power converters is drawn. The design rules of the modulation schemes for multilevel voltage source converters (VSCs) at low switching frequency are also proposed.

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“…The current needs in power electronics topology are focused on reliability, availability and power quality [1]. Nowadays, grids are restricting the harmonic content to guarantee the quality of power supply [2,3]. The most common topologies which are used in the prior article for three-level inverter are included neutral point clamped [4][5][6][7], the diode clamped structure [8] and full-bridge structure [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Performing of the MPPSO Optimization Algorithm to Minimize Line Voltage THD of 3-Level Inverter

Vadizadeh¹,

Ghorbani²,

Afjei³

2013

IOSR-JEEE

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Different modulation methods have been proposed to control the multilevel inverters. This paper focuses on the staircase waveform modulation for 3-level inverters with low switching frequencies. In this paper a novel solution along with a new robustness optimization algorithm is presented to minimization of Total Harmonic Distortion (THD) of the output line voltage of the inverter based on the Multi Population Particle Swarm Optimization (MPPSO). The MPPSO algorithm has a lot of advantages compared with a general optimization algorithm such as Genetic algorithm (GA). A comparison has been drawn between aforementioned techniques related to optimization. A new expression of fitness function is presented to optimization of Line Voltage THD (LVTHD) of 3-level Inverter. The advantages of fundamental frequency harmonic minimization and swarm intelligence are combined to improve the quality of output line voltage. The validity of the proposed method is proved through various simulation results by MATLAB software.

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Overview of Low Switching Frequency Control of High Power Three-Level Converters

Cited by 5 publications

References 20 publications

Induction Motor Drive Direct Torque Control and Predictive Torque Control Comparison Based on Switching Pattern Analysis

Induction Motor Drive Direct Torque Control and Predictive Torque Control Comparison Based on Switching Pattern Analysis

A Systematic Study on the Harmonic Overlap Effects for DC/AC Converters under Low Switching Frequency Modulation

Performing of the MPPSO Optimization Algorithm to Minimize Line Voltage THD of 3-Level Inverter

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