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A Multifrequency Equivalent Harmonic Modeling Method for Digital Discontinuous PWM
Haifeng Guo;Yifei Shao;Wubin Kong;Zirui Liu;Lianglin Li;Ronghai Qu;Minghai Dong;Zian Zhao;Yixue Wen
Compared to continuous pulsewidth modulation (CPWM) strategies, scattered output harmonics introduced by discontinuous PWM (DPWM) can cause increased loss, vibration, and noise in motor drive applications. An accurate assessment of the harmonic spectrum is crucial for comparing and improving the output performance of DPWM. However, solving the frequency-domain analytical expressions of output harm...Show More
Modulation Limitations on Non-Orthogonal Signal Waveform
2024 14th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)
Year: 2024 | Conference Paper |
To save bandwidth, this work compresses orthogonal frequency division multiplexing(OFDM) signals, intentionally breaking their orthogonality to transmit more information in a given time slot, thus achieving higher spectral efficiency. This leads to the creation of spectrally efficient frequency division multiplexing (SEFDM) signals. Due to the violation of the orthogonality, the signal generates i...Show More
Analysis and Suppression of Harmonic Current for NPC Three-Level Inverter Based on a Minimun Harmonic Current Modulation Strategy
2024 IEEE 7th International Electrical and Energy Conference (CIEEC)
Year: 2024 | Conference Paper |
The high-frequency harmonic current is of great difference based on the modulation strategy selected. The current harmonics will lead to the loss, electromagnetic noise, and torque ripple of the permanent magnet synchronous motor (PMSM). Therefore, this article proposed an improved modulation strategy to suppress the current harmonics. The proposed method is based on the frequency-domain model of ...Show More
Investigation of Losses in Regenerative Testing for a 240-kW Sectored Dual-Three-Phase PMSM
Haifeng Guo;Yongjun Cheng;Yifei Shao;Xinggang Fan;Dawei Li;Wubin Kong
2023 26th International Conference on Electrical Machines and Systems (ICEMS)
Year: 2023 | Conference Paper |
Regenerative testing (RT) as an indirect test method is increasingly attractive in high-power multiple three-phase motor applications since no additional mechanical load is needed. However, the RT may bring additional losses, which cause an abnormal temperature rise in the motor. This paper investigates the losses under RT conditions for a 240-kW sectored dual-three-phase surface permanent magnet ...Show More
A Method for Calculating Current Harmonics and RMS of DC-Link Capacitor Considering AC Output Current Harmonics
Yifei Shao;Yongjun Cheng;Wenjing Zheng;Haifeng Guo;Dawei Li;Wubin Kong
2023 26th International Conference on Electrical Machines and Systems (ICEMS)
Year: 2023 | Conference Paper |
Cited by: Papers (3)
DC-link capacitor current is a decisive factor for capacitor design and lifetime predictions. However, the conventional ripple current calculation method assumes that the inverter’s output current is an ideal sinusoidal wave modulated by naturally sampled. It results in an underestimation of the capacitor current RMS against the actual value. This article proposes a method to accurately quantity t...Show More
A Generator-Powered Electric Variable-Pitch Drive System for the High-Performance Regulation of Propeller
2023 26th International Conference on Electrical Machines and Systems (ICEMS)
Year: 2023 | Conference Paper |
With the development of variable-pitch system (VPS), the propulsion efficiency of more electric aircraft (MEA) is greatly improved. But the conventional VPS requires an external battery pack for power supply, which increases the total weight of the system and reduces the fuel efficiency. This paper proposes a generator-powered variable-pitch system (GVPS). The proposed system uses a generator mech...Show More
Processing Technology of Multi-sensor Position Fingerprint Information
2021 2nd International Conference on Intelligent Computing and Human-Computer Interaction (ICHCI)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
Aiming at the poor stability of the fingerprint library constructed using single sensor location fingerprint information and low positioning accuracy due to insufficient depth of fingerprint feature mining in traditional location fingerprint information processing technology, a new multi-sensor location fingerprint processing technology is proposed. First, the CSI phase and amplitude of the WiFi s...Show More
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