NTV 식별과정 없는 멀티레벨 인버터의 신속한 공간벡터PWM 변조 기법

陳善昊(Sun-Ho Jin),吳珍錫(Jin-Seok Oh) 대한전기학회 2006 전기학회논문지 B Vol.55 No.6

In this paper, we suggest a new space vector PWM modulation method with very short processing time which does not need identification of nearest three vectors(NTV) and duty ratio for each vector. The suggested PWM method makes mean value of phase voltage to be same as reference during every modulation period by use of a triangle in small hexagon on multi-level vector space. This paper described the suggested modulation method can be successfully applied to the space vector modulation use of multi-level inverter by computer simulations and experiments.

Space‑Vector‑Based Hybrid PWM for Zero‑Sequence‑Circulating‑Current RMS and Common Mode Voltage Reduction in Two Parallel Interleaved Two‑Level Converters

Zhiyong Zeng,Zhongxi Li,Stefan M. Goetz 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3

This paper aims at reducing the root mean square (RMS) values of the zero-sequence circulating current (ZSCC). The analysis reveals that the ZSCC is determined by the duty ratios of the medium voltage vector and zero vector. Whereas the reference voltage fxes the duty ratio of the medium vector, the duty ratio of the zero-voltage vector depends on the distribution of the small and larger vectors, which can be used to optimize the ZSCC. As such, we propose a generalized PWM architecture, where the distribution of the active vectors is parameterized by a coefcient k. Based on this, we derive regions for k that attain the same minimal ZSCC peak. Within these regions, we further optimize k to minimize the ZSCC RMS. Depending on the reference voltage, the method selects diferent coefcient k for the ZSCC RMS optimizations. The proposed modulation strategy is therefore a HBSVM due to its adaptive feature in the distribution of the active vectors. The proposed HBSVM uniformly applies to the entire vector plane and is computationally afordable for mainstream microcontrollers. Finally, the experimental results validate the merits of the proposed method.

A Fuzzy-2 Indirect Vector Control of Induction Motor Using Space Vector Fuzzy-2 Based PWM

Tikkani Abhiram,Prasad P. V. N. 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3

The predominant control method for a two-level voltage source inverter (TLVSI) fed induction motor drive system (IMDS) is fi eld oriented indirect vector control (FOIVC) because this method gives lesser stator current and torque ripples with faster dynamic response. The TLVSI control using FOIVC using fuzzy-2 and proportional integral (PI) based controllers is presented in this paper to study improvement in dynamic performance of IMDS. Further, to improve the fi ring strength of pulses of TLVSI, space vector fuzzy-2 based pulse-width modulation (SVF2PWM) replaces conventional space vector modulation. In Mamdani based interval type-2 fuzzy logic controller (IT2FLC), crisp output obtained from a rule base is designed with expert knowledge. The rules are operated from three-dimensional input and output membership functions operating on huge ambiguous data. Error tracking path of IT2FLC is diff erent from PI controller because of variable control gains attain steady state quickly as compared to PI controllers which have fi xed PI control gains. The proposed methods are simulated during starting, load perturbation and speed reversal of IMDS in MATLAB. The experimental validation is carried out on a prototype using ARM processor (STM32F49I) for a TLVSI based 1 HP IMDS.

Space-vector PWM Techniques for a Two-Phase Permanent Magnet Synchronous Motor Considering a Reduction in Switching Losses

Hai Lin,Fei Zhao,Byung-il Kwon 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

Two PWM techniques using space vector pulse-width modulation (SVPWM) are proposed for a two-phase permanent magnet synchronous motor (PMSM) driven by a two-phase eightswitch inverter. A two-phase motor with two symmetric stator windings is usually driven by a twophase four-, six-, or eight-switch inverter. Compared with a four- and six-switch inverter, a two-phase eight-switch inverter can achieve larger power output. For two-phase motor drives, the SVPWM technique achieves more efficient DC bus voltage utilization and less harmonic distortion of the output voltage. For a two-phase PMSM fed by a two-phase eight-switch inverter under a normal SVPWM scheme, each of the eight PWM trigger signals for the inverter have to be changed twice in a cycle, causing a higher PWM frequency. Based on the normal SVPWM scheme, two effective SVPWM schemes are investigated in order to reduce the PWM frequency by rearranging four comparison values, while achieving the same function as the normal PWM scheme. A detailed explanation of the normal and two proposed SVPWM schemes is illustrated in the paper. The experimental results demonstrate that the proposed schemes achieve a better steady performance with lower switching losses compared with the normal scheme.

A Modified Space Vector PWM for Common Mode Voltage Mitigation in Diode Rectifier / Z-Source Inverter System

Q.V. TRAN,J.R. AHN,T.W. CHUN,H.G. KIM,E.C. NHO 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

In this paper, the common-mode voltage of the diode rectifier/Z-source inverter system is analyzed in details under both the shoot-through state and non-shoot-through state. Then, a modified space-vector modulation strategy is proposed to effectively mitigate the amount of negative common-mode voltage. The negative common-mode voltage can be attenuated, by eliminating the zero voltage vector V? in modified space-vector modulation. The proposed method is easily implemented in software. Finally, some simulation studies by PSIM and experiments with 32-bit DSP are carried out to demonstrate the benefits of the proposed algorithm.

NTV 식별과정 없는 멀티레벨 인버터의 신속한 공간벡터 PWM 변조기법

오진석(Jin-seok Oh),이종호(Jong-ho Lee),진선호(Sun-ho Jin),곽준호(Jun-ho Kwak),조관준(Kwan-Jun Jo),김종도(Jong-Do Kim) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-

this paper suggest a new space vector PWM modulation method with short processing time which does not need idenfication of nearest three vectors(NTV) and duty calculation for each vector. The suggested PWM method makes mean value of phase voltage to be same as reference during every modulation period by use of a triangle in small hexagon on multi-level vector space. This paper described the suggested modulation method can be successfully applied to the space vector modulation use of multi-level inverter by computer simulations and experiments.

Modified Direct Torque Control using Algorithm Control of Stator Flux Estimation and Space Vector Modulation Based on Fuzzy Logic Control for Achieving High Performance from Induction Motors

Hassan Farhan Rashag,S. P. Koh,Ahmed N. Abdalla,Nadia M. L. Tan,K. H. Chong 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3

Direct torque control based on space vector modulation (SVM-DTC) protects the DTC transient merits. Furthermore, it creates better quality steady-state performance in a wide speed range. The modified method of DTC using SVM improves the electrical magnitudes of asynchronous machines, such as minimizing the stator current distortions, the stator flux with electromagnetic torque without ripple, the fast response of the rotor speed, and the constant switching frequency. In this paper, the proposed method is based on two new control strategies for direct torque control with space vector modulation. First, fuzzy logic control is used instead of the PI torque and a PI flux controller to minimizing the torque error and to achieve a constant switching frequency. The voltages in the direct and quadratic reference frame (Vd ,Vq) d q are achieved by fuzzy logic control. In this scheme, the switching capability of the inverter is fully utilized, which improves the system performance. Second, the close loop of stator flux estimation based on the voltage model and a low pass filter is used to counteract the drawbacks in the open loop of the stator flux such as the problems saturation and dc drift. The response of this new control strategy is compared with DTC-SVM. The experimental and simulation results demonstrate that the proposed control topology outperforms the conventional DTC-SVM in terms of system robustness and eliminating the bad outcome of dc-offset.

Modified Direct Torque Control using Algorithm Control of Stator Flux Estimation and Space Vector Modulation Based on Fuzzy Logic Control for Achieving High Performance from Induction Motors

Rashag, Hassan Farhan,Koh, S.P.,Abdalla, Ahmed N.,Tan, Nadia M.L.,Chong, K.H. The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.3

Direct torque control based on space vector modulation (SVM-DTC) protects the DTC transient merits. Furthermore, it creates better quality steady-state performance in a wide speed range. The modified method of DTC using SVM improves the electrical magnitudes of asynchronous machines, such as minimizing the stator current distortions, the stator flux with electromagnetic torque without ripple, the fast response of the rotor speed, and the constant switching frequency. In this paper, the proposed method is based on two new control strategies for direct torque control with space vector modulation. First, fuzzy logic control is used instead of the PI torque and a PI flux controller to minimizing the torque error and to achieve a constant switching frequency. The voltages in the direct and quadratic reference frame ($V_d$, $V_q$) are achieved by fuzzy logic control. In this scheme, the switching capability of the inverter is fully utilized, which improves the system performance. Second, the close loop of stator flux estimation based on the voltage model and a low pass filter is used to counteract the drawbacks in the open loop of the stator flux such as the problems saturation and dc drift. The response of this new control strategy is compared with DTC-SVM. The experimental and simulation results demonstrate that the proposed control topology outperforms the conventional DTC-SVM in terms of system robustness and eliminating the bad outcome of dc-offset.

Decoupled SVPWM for Five-Phase Permanent Magnet Machines with Trapezoidal Back-EMF

Zhipeng Lin,Guohai Liu,Wenxiang Zhao,Qian Chen 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5

This paper presents a novel space vector pulse-width modulation (SVPWM) to synthesize an arbitrary non-sinusoidal phase voltage. The key of the proposed method is that the switching vectors used to comprise the reference vectors in the α₁-β₁ frame and the α₃-β₃ frame are decoupled. In the α₁-β₁ frame, the reference vector is comprised by near two large vectors. The corresponding vector comprised by the two vectors in the α₃-β₃ frame is considered as a disturbance, which is restrained by close-loop control. In the α₃-β₃ frame, there are two methods to comprise the reference vector. Method I is a near two middle vectors method. Method II uses near four vectors (two middle and two little vectors). The proposed SVPWM using decoupled switching vectors can guarantee a maximum modulation index in the α₁-β₁ frame. The effectiveness of the proposed method is verified by simulated and experimental results under various operation conditions.

Decoupled SVPWM for Five-Phase Permanent Magnet Machines with Trapezoidal Back-EMF

Lin, Zhipeng,Liu, Guohai,Zhao, Wenxiang,Chen, Qian The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5

This paper presents a novel space vector pulse-width modulation (SVPWM) to synthesize an arbitrary non-sinusoidal phase voltage. The key of the proposed method is that the switching vectors used to comprise the reference vectors in the ${\alpha}_1-{\beta}_1$ frame and the ${\alpha}_3-{\beta}_3$ frame are decoupled. In the ${\alpha}_1-{\beta}_1$ frame, the reference vector is comprised by near two large vectors. The corresponding vector comprised by the two vectors in the ${\alpha}_3-{\beta}_3$ frame is considered as a disturbance, which is restrained by close-loop control. In the ${\alpha}_3-{\beta}_3$ frame, there are two methods to comprise the reference vector. Method I is a near two middle vectors method. Method II uses near four vectors (two middle and two little vectors). The proposed SVPWM using decoupled switching vectors can guarantee a maximum modulation index in the ${\alpha}_1-{\beta}_1$ frame. The effectiveness of the proposed method is verified by simulated and experimental results under various operation conditions.