Study and Simulation of Dead-Time Compensation for the Voltage Source SVPWM Inverter

2013 ◽  
Vol 300-301 ◽  
pp. 1200-1204
Author(s):  
Shao Chang Chen ◽  
Hui Ying He ◽  
Chao Li ◽  
Chuan Hui Wang
Keyword(s):  
Dead Time ◽  
Time Effect ◽  
Voltage Source ◽  
System Control ◽  
Current Clamp ◽  
Compensation Strategy ◽  
Phase Current ◽  
Zero Current ◽  
The Dead ◽  
Dead Time Compensation

The dead-time effect of the SVPWM inverter was analyzed as well as its effect on the control system performance (distortion of phase voltage and zero-current clamp phenomenon of phase current, etc).Then, basing on the analysis about the generation of the dead-time effect, the error voltage vector compensation strategy was raised. In order to verify the correctness and reasonableness of the compensation strategy, simulation system was constructed in use of Matlab/Simulink software to implement analysis and research. Simulation results show that the zero-current clamp phenomenon of phase current was basically eliminated after using the dead-time compensation. Then spectrum analysis was made for the phase current waveform, which showed that the compensation strategy weakened the fifth and seventh harmonic waveform brought by the dead for the inverter, significantly improved sinusoidal and system control performance of the phase current, and proved the theoretical correctness and experimental feasibility.

A New SVPWM Dead-Time Compensation Strategy for Low Speed Direct-Drive Motor

2013 ◽  
Vol 416-417 ◽  
pp. 536-542
Author(s):  
Liang Cheng ◽  
Dong Ru Sun ◽  
Xiao Jie Ye ◽  
Yun Yue Ye ◽  
Yong Jin
Keyword(s):  
Pulse Width Modulation ◽  
Dead Time ◽  
Time Effect ◽  
Direct Drive ◽  
Compensation Strategy ◽  
Low Speed ◽  
Zero Current ◽  
Speed Fluctuation ◽  
Wave Forms ◽  
Dead Time Compensation

Traditional space vector pulse-width modulation (SVPWM) algorithm included complex calculations like triangle functions and square root, which increased execution time of the program. A novel SVPWM algorithm calculating modulation functions of three phases through stationary αβ components of reference voltage vectors was proposed here to solve the problem, which was composed of only simple four arithmeticoperations. The method simplified traditional SVPWM and improved real-time performance of digital control system. However, dead-time effect still existed in novel SVPWM algorithm. And it will lead to distortions of low speed direct-drive PMSM phase currents, brought increase of speed fluctuation, resulted in unstable operating of servo system. This paper analyzed details of error voltage vectors led by dead-time effect, researched relationship between error voltage vectors and polarities of three phase currents, and put forward a novel dead-time compensation strategy that decreased influence of zero current clamping. Simulation results showed that this strategy can effectively compensate effects of dead-time error voltage vector and improve wave forms of phase currents, which increased operating performance of low speed direct-drive PMSM.

scholarly journals Control Strategies of Mitigating Dead-time Effect on Power Converters: An Overview

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 196 ◽  
Author(s):  
Yi Ji ◽  
Yong Yang ◽  
Jiale Zhou ◽  
Hao Ding ◽  
Xiaoqiang Guo ◽  
...  
Keyword(s):  
Power Converters ◽  
Dead Time ◽  
Control Strategies ◽  
Time Effect ◽  
Voltage Source ◽  
Voltage Source Converters ◽  
Negative Effects ◽  
Advantages And Disadvantages ◽  
The Dead ◽  
Dead Time Compensation

To prevent short-circuits between the upper and lower switches of power converters from over-current protection, the dead time is mandatory in the switching gating signal for voltage source converters. However, this results in many negative effects on system operations, such as output voltage and current distortions (e.g., increased level of fifth and seventh harmonics), zero-current-clamping phenomenon, and output fundamental-frequency voltage reduction. Many solutions have been presented to cope with this problem. First, the dead-time effect is analyzed by taking into account factors such as the zero-clamping phenomenon, voltage drops on diodes and transistors, and the parameters of inverter loads, as well as the parasitic nature of semiconductor switches. Second, the state-of-the-art dead-time compensation algorithms are presented in this paper. Third, the advantages and disadvantages of existing algorithms are discussed, together with the future trends of dead-time compensation algorithms. This article provides a complete scenario of dead-time compensation with control strategies for voltage source converters for researchers to identify suitable solutions based on demand and application.

scholarly journals Novel Dead-Time Compensation Strategy for Wide Current Range in a Three-Phase Inverter

Electronics ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 92 ◽  
Author(s):  
Jeong-Woo Lim ◽  
Hanyoung Bu ◽  
Younghoon Cho
Keyword(s):  
Dead Time ◽  
Compensation Voltage ◽  
Voltage Source ◽  
Current Phase ◽  
Phase Voltage ◽  
Compensation Strategy ◽  
High Modulation ◽  
Voltage Controller ◽  
Three Phase ◽  
Dead Time Compensation

This paper proposes a novel three-phase voltage source inverter dead-time compensation strategy for accurate compensation in wide current regions of the inverter. In particular, an analysis of the output voltage distortion of the inverter, which appears as parasitic components of the switches, was conducted for proper voltage compensation in the low current region, and an on-line compensation voltage controller was proposed. Additionally, a new trapezoidal compensation voltage implementation method using the current phase was proposed to simplify realizing the trapezoidal shape of the three-phase compensation voltages. Finally, when the proposed dead-time compensation strategy was applied, the maximum phase voltage magnitude in the linear modulation voltage regions was defined to achieve smooth operation even at high modulation index. Simulations and experiments were conducted to verify the performance of the proposed dead-time compensation scheme.

scholarly journals Analysis and Elimination of Dead-Time Effect in Wireless Power Transfer System

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1577 ◽  
Author(s):  
Xin Liu ◽  
Tianfeng Wang ◽  
Nan Jin ◽  
Salman Habib ◽  
Muhammad Ali ◽  
...  
Keyword(s):  
High Frequency ◽  
Dead Time ◽  
Short Circuit ◽  
Wireless Power Transfer ◽  
Time Effect ◽  
Voltage Source ◽  
Power Transfer ◽  
Wireless Power ◽  
Voltage Distortion ◽  
The Dead

Dead time between the complementary driving signals is needed to avoid short circuit in voltage source inverters (VSIs), however, this raises issues such as voltage distortion and harmonic generation. In wireless power transfer (WPT) systems, the ratio of dead time versus operating period becomes more problematic due to the high frequency, where the dead time can cause serious concerns regarding the phase errors and control performance deterioration. Therefore, this paper presents a comprehensive analysis of the dead-time effect for WPT systems based on a series–series (SS) topology. Firstly, it is found that voltage distortion appears in two regions in comparison with the three in one active bridge WPT system, and seven regions, as compared to the eight in dual active bridge (DAB) WPT system. Afterwards, a novel pulse width modulation (PWM) method is proposed, where the driving signals of the same phase leg are no longer complementary to each other. By employing the proposed method, the dead-time effect can be addressed up to a certain extent, and the desired voltage can be obtained in all the regions. In addition, the proposed method is not influenced by the system parameters, and can be easily applied to other high-frequency resonant converters. Simulated and experimental results are added to verify the feasibility and efficacy of the proposed control scheme.

scholarly journals Novel Dead-Time Compensation Strategy for Wide Current Range in a Three-Phase Inverter

2018 ◽  
Author(s):  
Jeong-Woo Lim ◽  
Hanyoung Bu ◽  
Younghoon Cho
Keyword(s):  
Dead Time ◽  
Compensation Voltage ◽  
Voltage Source ◽  
Current Phase ◽  
Phase Voltage ◽  
Compensation Strategy ◽  
High Modulation ◽  
Voltage Controller ◽  
Three Phase ◽  
Dead Time Compensation

This paper proposes a novel three-phase voltage source inverter dead-time compensation strategy for accurate compensation in wide current regions of the inverter. In particular, an analysis of the output voltage distortion of the inverter, which appears as parasitic components of the switches, has been conducted for proper voltage compensation in the low current region, and an on-line compensation voltage controller has been proposed. Also, a new trapezoidal compensation voltage implementation method using the current phase is proposed to simplify realizing the trapezoidal shape of the three-phase compensation voltages. Finally, when the proposed dead-time compensation strategy is applied, the maximum phase voltage magnitude in the linear modulation voltage regions is defined to achieve smooth operation even at high modulation index. Simulations and experiments were conducted to verify the performance of the proposed dead-time compensation scheme.

scholarly journals Dead-Time Correction Applied for Extended Flux-Based Sensorless Control of Assisted PMSMs in Electric Vehicles

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 220
Author(s):  
Cheng Lin ◽  
Jilei Xing ◽  
Xingming Zhuang
Keyword(s):  
Control System ◽  
Electric Vehicles ◽  
Dead Time ◽  
Sensorless Control ◽  
Correction Method ◽  
Time Effect ◽  
Dead Time Correction ◽  
Speed Range ◽  
Time Correction ◽  
The Dead

Sensorless control technology of PMSMs is of great importance for safety and reliability in electric vehicles. Among all existing methods, only the extended flux-based method has great performance over all speed range. However, the accuracy and reliability of the extended flux rotor position observer are greatly affected by the dead-time effect. In this paper, the extended flux-based observer is adopted to develop a sensorless control system. The influence of dead-time effect on the observer is analyzed and a dead-time correction method is specially designed to guarantee the reliability of the whole control system. A comparison of estimation precision among the extended flux-based method, the electromotive force (EMF)-based method and the high frequency signal injection method is given by simulations. The performance of the proposed sensorless control system is verified by experiments. The experimental results show that the proposed extended flux-based sensorless control system with dead-time correction has satisfactory performance over full speed range in both loaded and non-loaded situations. The estimation error of rotor speed is within 4% in all working conditions. The dead-time correction method improves the reliability of the control system effectively.

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