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Xuning Zhang,Dushan Boroyevich,Rolando Burgos 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a hybrid modulation method to limit the neutral point (NP) voltage ripple and reduce the requirement for dc link capacitors during the startup process for three level motor drive systems. The neutral point voltage calculation model is presented to study the large NP voltage ripple for three level modulation during the startup process. Moreover, the possible overvoltage issue on the semiconductors considering the different switching speed of the devices for two level modulation in three level NPC converters is analyzed in detail. To avoid such overvoltage on the semiconductors, zero neutral point voltage ripple modulation (ZNPVR) method is proposed to limit the NP voltage ripple when the output fundamental frequency is low. The implementation method of the proposed method is discussed in detail. When the output fundamental frequency is high, the modulation can smoothly transit to normal NTSV modulation for lower current ripple and higher efficiency. Both simulation and experimental results are shown to verify the analysis based on a 3 kW three level VSI dc-fed motor drive system.
Chuan-Jin Zhang,Rui-Peng Wei,Yi Tang,Ke Wang 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.5
A novel space vector modulation strategy in the non-orthogonal three-dimensional coordinate system for multi-level three-phase four-wire inverters is proposed in this paper. This new non-orthogonal three-dimensional space vector modulation converts original trigonometric functions in the orthogonal three-dimensional space coordinate into simple algebraic operations, which greatly reduces the algorithm complexity of three-dimensional space vector modulation and preserves the independent control of the zero-sequence component. Experimental results have verified the correctness and effectiveness of the proposed three-dimensional space vector modulation in the new non-orthogonal three-dimensional coordinate system.
Wavelet PWM Technique for Single-Phase Three-Level Inverters
Chun-Fang Zheng,Bo Zhang,Dong-Yuan Qiu,Xiao-Hui Zhang,Le-Ming Xiao 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6
The wavelet PWM (WPWM) technique has been applied in two-level inverters successfully, but directly applying the WPWM technique to three-level inverters is impossible. This paper proposes a WPWM technique suitable for a single-phase three-level inverter. The work analyzes the control strategy with the WPWM and obtains the design of its parameters. Compared with the SPWM technique for a single-phase three-level inverter under the same conditions, the WPWM can obtain high magnitudes of the output fundamental frequency component, low total harmonic distortion, and simpler digital implementation. The feasibility experiment is given to verify of the proposed WPWM technique.
A Simplified Synchronous Pulse-Width Modulation Method for Three-level Inverter of High-speed Train
Fei Lin,Qiaona Lian,Jialiang Yuan,Zhongping Yang,Zhiqiang Zhang,Yue Xu,Jinghai Jiao 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.12
The synchronous Pulse-Width Modulation (PWM) is quite complex for three-level neutral point-clamped (NPC) inverter. A simple central 60° synchronous modulation method is presented in this paper for three-level NPC inverter used in the multi-mode PWM strategy. For the fundamental voltage command, the switching angle could be real-time calculated based on this modulation method with different carrier frequency ratios. The switching strategy between these modes is discussed for multi-mode PWM. According to this method, a simulation model of the drive system with three-level inverter and induction motor is built. The simulation results at asynchronous modulation, central 60° synchronous modulation and square wave area, show that the output voltage values can meet the requirements with a good symmetry even in the case of low carrier frequency ratio. The smooth switching among different modes is also accomplished with low impulse current.
Current Sector Control for a Three-Phase Three-Level PFC Rectifier
O. Tubburee,Y. Kumsuwan 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, a control algorithm of a three-phase three-level power factor correction (PFC) rectifier, using a mathematical analysis of two-level space vector modulation (SVM), is presented. The proposed control scheme was developed, in order to generate the duty cycle signals for each switching device based on the discontinuous space vector modulation (DSVM) method. For this proposal it is not essential to determine the direction of line currents and sector of vectors, only to recognize the angle of the input reference voltage. Furthermore, the number of commutations of switches and switching losses are reduced due to the DSVM method. Simulation and calculation results can confirm the feasibility of the control algorithm and performance of the proposed rectifier.
Sensorless Vector Control for Permanent Magnet Synchronous Motor Fed by Three-Level Inverter
Jiangcheng Wang,Shanmei Cheng,Bo Gong 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Three-level inverters and relative techniques have been concerned more and more in industrial drive applications because of the outstanding performance. The aim of this paper is to present a strategy for the sensorless vector control of Permanent Magnet Synchronous Motor (PMSM) drive fed with a three-level Neutral-Point-Clamped (NPC) inverter. By measuring the different current change rates which are caused by the voltage vectors applied to the motor by the Space Vector Modulation (SVM) scheme for three-level inverter, signals that contain the information of rotor position are obtained. Therefore, the rotor angle can be calculated. Since none of any prior knowledge of the PMSM parameters is used, the position estimation accuracy is not affected by the parameters variation or measurement error. Furthermore, taking advantages of the three-level voltage inverter, the ripples of torque as well as the harmonics of the phase voltages are significantly reduced. The simulation results demonstrate that the proposed strategy is effective and this system operates well over a wide speed range.
Da-Hye Park,Min Kim,Wook-Jin Lee 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.1
This paper presents a dual-motor drive system with a three-phase two-level inverter for independent speed control of a three-phase motor and a single-phase motor. The single-phase motor is connected in series between the neutral point of the three-phase motor and the midpoint of two split DC-link capacitors. As the single-phase motor current is a zero-sequence component flowing in the three-phase motor, it does not affect the operation of the three-phase motor. The proposed drive system can reduce the number of power switches compared with the conventional drive system that uses a single-phase and a three-phase inverter. Thus, the proposed system can reduce the cost of the drive system. Simulations and experiments are presented to verify the proposed drive system.
Srirattanawichaikul, Watcharin,Premrudeepreechacharn, Suttichai,Kumsuwan, Yuttana The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.2
This paper presents a simple modified unipolar carrier-based pulsewidth modulation (CB-PWM) strategy for the three-level neutral-point-clamped (NPC) voltage source inverter (VSI). Analytical expressions for the relationship between modulation reference signals and output voltages are derived. The proposed modulation technique for the three-level NPC VSI includes the maximum and minimum of the three-phase sinusoidal reference voltages with zero-sequence voltage injection concept. The proposed modified CB-PWM strategy incorporates a novel method that requires only of one triangular carrier wave for generate the gating pulses in three-level NPC VSI. It has the advantages of being simplifying the algorithm with no need of complex two/multi-carrier pulsewidth modulation or space vector modulation (SVM) and it's also simple to implement. The possibility of the proposed CB-PWM technique has been verified though computer simulation and experimental results.
Watcharin Srirattanawichaikul,Suttichai Premrudeepreechachar,Yuttana Kumsuwan 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.2
This paper presents a simple modified unipolar carrier-based pulsewidth modulation (CBPWM) strategy for the three-level neutral-point-clamped (NPC) voltage source inverter (VSI). Analytical expressions for the relationship between modulation reference signals and output voltages are derived. The proposed modulation technique for the three-level NPC VSI includes the maximum and minimum of the three-phase sinusoidal reference voltages with zero-sequence voltage injection concept. The proposed modified CB-PWM strategy incorporates a novel method that requires only of one triangular carrier wave for generate the gating pulses in three-level NPC VSI. It has the advantages of being simplifying the algorithm with no need of complex two/multi-carrier pulsewidth modulation or space vector modulation (SVM) and it’s also simple to implement. The possibility of the proposed CB-PWM technique has been verified though computer simulation and experimental results.
Zhang, Chuan-Jin,Wei, Rui-Peng,Tang, Yi,Wang, Ke The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.5
A novel space vector modulation strategy in the non-orthogonal three-dimensional coordinate system for multi-level three-phase four-wire inverters is proposed in this paper. This new non-orthogonal three-dimensional space vector modulation converts original trigonometric functions in the orthogonal three-dimensional space coordinate into simple algebraic operations, which greatly reduces the algorithm complexity of three-dimensional space vector modulation and preserves the independent control of the zero-sequence component. Experimental results have verified the correctness and effectiveness of the proposed three-dimensional space vector modulation in the new non-orthogonal three-dimensional coordinate system.