• Title/Summary/Keyword: carrier harmonics

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Numerical Analysis on Iron Loss and PM Loss of Permanent Magnet Synchronous Motor Considering the Carrier Harmonics

  • Lee, Dongsu;Kim, Yong-Jae;Jung, Sang-Yong
    • Journal of Magnetics
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    • v.18 no.2
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    • pp.216-219
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    • 2013
  • In this paper, the influence of inverter switching harmonics on iron loss and PM loss of Permanent Magnet Synchronous Motor (PMSM) is numerically investigated by Finite Element Method (FEM). In particular, nonlinear FEM is applied for a multi-layered PM Synchronous Motors (PMSMs), Interior buried PMSM (IPMSM) and PM assisted Synchronous Reluctance Motor (PMa-SynRM), which are adoptively designed and compared for Electric Vehicle (EV) propulsion. In particular, iron loss and PM eddy-current loss under the real current waveform including the carrier harmonics from inverter switching are numerically analyzed with nonlinear FEM by considering the skewed stator structure employed for minimizing spatial harmonics.

Pseudo-Randomized Frequency Carrier Modulation Scheme with Improved Harmonics Spectra Spreading Effects (고조파 스펙트럼 확산효과를 개선한 준 랜덤 주파수 캐리어 변조기법)

  • Kim, Jong-Nam;Jung, Young-Gook;Lim, Young-Cheol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.12
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    • pp.64-70
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    • 2008
  • In case that conventional PRC(Pseudo-Randomized Frequency Carrier) modulation scheme is applied to a three-phase HBML(H-Bridge Multi-Level Inverter), the dominant harmonics spectra appear at twice switching frequency. In this paper, the dominant harmonics spectra spreading effect of the conventional PRC scheme was improved by using three stage MUXs(Multiplexers) and two triangular carriers with fixed frequency which has mutual relation of the twice frequency. To confirm the validity of the improved PRC scheme, the experiment were performed on a 1.5[kw] three-phase HBML based induction motor drives. And, the harmonics spectra of the conventional and improved PRC schemes are compared and discussed.

A Pseudo-Random Carrier PWM Technique by Fixed Frequency Carrier Composition (고정 주파수의 캐리어 합성에 의한 준 랜덤 주파수 캐리어 PWM기법)

  • Kim, Jong-Nam;Jung, Young-Gook;Lim, Young-Cheol;Park, Sung-.Jun;Kim, Kwang-Heon
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.11
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    • pp.547-552
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    • 2005
  • This paper describes a pseudo-random carrier PW technique for the power converters. The proposed method generates a new pseudo-random carrier by randomly composing a carrier with fixed frequency and a carrier with opposition phase. To confirm the validity of the proposed method, a single-phase multi-level inverter was implemented and tested. The experimental results show that the output voltage and current harmonics spectra of an inverter have broadening effect of harmonics, as only simple composition of fixed frequency carries.

3-Phase Pseudo-Random Carrier Modulation Technique for the Acoustic Noise Reduction of the 3-Phase Multi-Level Inverter Based Motor (3상 멀티 레벨 인버터 구동 유도 전동기의 소음저감을 위한 3상 준 랜덤 캐리어 변조기법)

  • Park, J.K.;Kim, J.N.;Jung, Y.G.;Lim, Y.C.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.742-745
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    • 2005
  • This paper describes a simple pseudo-random carrier modulation technique for the acoustic noise reduction of the three phase multi-level inverter based motor drives. The proposed method generates a new pseudo-random carrier by randomly synthesizing a carrier with fixed frequency and a carrier with opposition phase. To confirm the validity of the proposed method, a 130v three-phase multi-level inverter was Implemented and tested. The experimental results show that the output line voltage and acoustic noise harmonics spectra of an inverter have broadening effect of harmonics, as only simple synthesis of fixed frequency carries.

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Analysis on Position Estimation Performance according to Injection Frequency in Carrier-Based Sensorless Operation (반송파 기반 센서리스 운전에서 주입하는 신호의 주파수에 따른 위치 추정 성능 분석)

  • Hwang, Chae-Eun;Lee, Younggi;Sul, Seung-Ki
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.2
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    • pp.139-146
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    • 2018
  • This work puts forward a theoretical analysis on position estimation performance of interior permanent magnet synchronous motor (IPMSM) according to the injection frequency in carrier-based sensorless operation. The effects of spatial harmonics on inductance and voltage distortion due to the nonideal characteristics of IPMSM and inverter are examined as factors influencing the position estimation performance. Furthermore, the position estimation performance is analyzed by calculating the current at the switching instant in several operating conditions. In summary, the half switching frequency injection is more robust to the nonideal characteristics of IPMSM, especially with light load condition. The validity of the analysis is verified by the simulation and experimental results.

A study on the Noise Reduction of Uninterruptible Power Supply using Random PWM Method (Random PWM 기법을 이용한 무정전 전원장치의 노이즈 저감에 관한 연구)

  • Eom, Tae-Wook;Lee, Byung-Soon;Lee, Jae-Hak
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.11
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    • pp.100-105
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    • 2014
  • In this paper, Uninterruptible Power Supply(UPS) Inverter system using Carrier Frequency Modulated PWM (CFM-PWM) is proposed to reduced harmonics and electromagnetic noise. Power conversion of UPS system is executed by the ON-OFF operation of semiconductor switching devices. However, this switching operation causes the surge and EMI which deteriorate the reliability of the UPS system. This Problems improved by Random PWM switching method. The simulation results of the proposed system was compared with the system using conventional method using Matlab/Simulink. The results show that the output voltage and current harmonics of the proposed UPS system significantly decreased and spread into wide band area by the proposed Carrier Frequency Modulated PWM(CFM-PWM) method based on the Space Vector Modulation.

An Improved Saw Tooth Carrier PWM Method for Three Phase Voltage Source Inverters (3상 전압원 인버터를 위한 개선된 톱니 반송파 펄스 폭 변조 방법)

  • Park, In-Gyu
    • Proceedings of the KIEE Conference
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    • 1995.11a
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    • pp.302-305
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    • 1995
  • An improved carrier PWM method for three phase voltage source inverters is proposed. The basic idea of the proposed method is deleting unnecessary 1/3 of switchings in the saw tooth carrier PWM method. The lowest frequency of the remained harmonics of this method (when the modulation index is large) is about 50% higher and the maximum modulated voltage is about 15% higher than those of the triangular carrier PWM method. This method will be useful especially in the linear feedback current control and MOSFET inverters.

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Output Voltage Harmonics Analysis of NPC Type Three-level Inverter (NPC형 3레벨 인버터의 출력전압 고조파 분석)

  • Kwon, Kyoung-Min;Choi, Jae-Ho;Chung, Gyo-Bum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.6
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    • pp.472-480
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    • 2009
  • This paper describes the overmodulative SVPWM technique and harmonics analyses of three phase NPC type three-level inverter to the modulation index. Three phase NPC type three-level inverter adopted SVPWM to extend the linear region to 0.907, moreover, the following voltage compensation using Fourier series was adopted in the region of overmodulation to make it work to six-step level. PD type of multi carrier method is used with the double Fourier series for the analysis of output power harmonics characteristic. Simulation was performed by PSIM, and the harmonics characteristics of 3-level inverter in each region are analyzed. The side band harmonics of carrier frequency are dominant in the linear region, but these harmonic components are decreased as the inveter goes to overmodulation region, and the harmonics due to the fundamental frequency is increased gradually at the same time. The harmonic analyses are verified through the simulation and experimental results under the same condition.

A New Overlap Current Restraining Method for Current-source Rectifier

  • Qin, Haihong;Liu, Qing;Zhang, Ying;Zhang, Xin;Wang, Dan
    • Journal of Power Electronics
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    • v.18 no.2
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    • pp.615-626
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    • 2018
  • To ensure a DC current path and avoid large voltage overshoot of the DC-link inductor, alternating PWM pulses in the current-source rectifier should be supplemented by overlap time, which generates an overlap current and causes input current distortion. In this study, the influence of overlap time is illustrated by comparing the AC-side current before and after overlap time is added. The overlap current distribution caused by overlap time is discussed under different modulation carriers, including triangle carrier, positive-going carrier, and negative-going carrier. The quantitative relationship between the extra harmonics of the AC-side current and overlap time is based on the Fourier analysis. Based on the commutation analysis, a new carrier modulation scheme that can restrain overlap current is proposed. A 3 kW prototype is established to verify the effectiveness of the influence of overlap time and the proposed restraining modulation scheme.

An Improved Phase-Shifted Carrier Pulse Width Modulation Based on the Artificial Bee Colony Algorithm for Cascaded H-Bridge Multilevel Inverters

  • Cai, Xinjian;Wu, Zhenxing;Li, Quanfeng;Wang, Shuxiu
    • Journal of Power Electronics
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    • v.16 no.2
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    • pp.512-521
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    • 2016
  • Cascaded H-bridge multilevel (CHBML) inverters usually include a large number of isolated dc-voltage sources. Some faults in the dc-voltage sources result in unequal cell dc voltages. Unfortunately, the conventional phase-shifted carrier (PSC) PWM method that is widely used for CHBML inverters cannot eliminate low frequency sideband harmonics when the cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM that can eliminate low frequency sideband harmonics under the condition of unequal dc voltages. In order to calculate the carrier phases, it is necessary to solve transcendental equations for low frequency sideband harmonic elimination. Therefore, an approach based on the artificial bee colony (ABC) algorithm is presented in this paper. The proposed PSCPWM method enhances the reliability of CHBML inverters. The proposed PSCPWM is not limited to CHBML inverters. It can also be applied to other types of multilevel inverters. Simulation and experimental result obtained from a prototype CHBML inverter verify the theoretical analysis and the achievements made in this paper.