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Open-Circuit Fault Diagnosis for Active Rectifiers in Doubly Salient Electromagnetic Generator Systems
The performance of the double salient electromagnetic generator (DSEG) system is improved by replacing diode rectifiers with active rectifiers. However, the fault rate of power switches is higher than that of diodes. Thus, diagnosing faults in active rectifiers is necessary. This article proposes a fault diagnosis method for power switch open-circuit faults of active rectifiers in DSEG systems. Fi...Show More
Rotor Position Estimation Method of Brushless Synchronous Starter/Generators by Using Stator Currents of the Main Exciter in Both Excitation Modes
Xinyu Li;Weiguo Liu;Shuai Mao;Ningfei Jiao;Chongzhao Ma;Xiaoke Zhang;Chenghao Sun
The brushless synchronous starter-generator (BSSG) consists of a coaxially connected main exciter (ME) and main machine (MM), of which ME has two excitation modes (ac excitation mode and dc excitation mode). However, most of the existing rotor position estimation methods are suitable for only one of the excitation methods, and there are often situations where signal injection is required or depend...Show More
Fault Diagnosis Method for the Rotating Components of Aircraft Multi-stage Brushless Synchronous Starter-Generator
2024 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific)
Year: 2024 | Conference Paper |
With the rapid development of the more electric aircraft (MEA) equipped with an integrated starter-generator, it is of great significance to carry out research on fault diagnosis of the multi-stage brushless synchronous starter-generator (MBSSG) to improve the reliability and maintainability of the system. An electrical fault diagnosis method for the rotating components of MBSSG based on the rotor...Show More
Fault Diagnosis of a Rotating Rectifier in a Three-Stage Starter-Generator based on the Main Exciter Stator Currents
Shoucheng Li;Chenghao Sun;Wenjing Xu;Xinyu Li;Kele Qian;Shuye Ding;Yanwu Xu
2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia)
Year: 2024 | Conference Paper |
A new approach for diagnosing faults in the rotating rectifier of a three-stage starter/generator is introduced. In this method, the stator three-phase currents of the main exciter are collected and quadratic sum calculated, then the fundamental component as well as the DC component of the quadratic sum of currents are obtained. The amplitude ratio of the two components is calculated for fault dia...Show More
Understanding LiDAR Performance for Autonomous Vehicles Under Snowfall Conditions
Chenghao Sun;Pengpeng Sun;Jianqiu Wang;Ying Guo;Xiangmo Zhao
Light detection and ranging sensors (LiDARs) have become indispensable for autonomous vehicles because of their high detection accuracy and independence from lighting conditions. At present, although LiDARs with various beams have been developed, their performance is degraded to varying degrees in severe weather such as rain and snowfall. This restricts the reliable operation of autonomous vehicle...Show More
Advance Phase Changing Control of the Doubly Salient Electromagnetic Generator Based on the Half-controlled Rectifier
2023 26th International Conference on Electrical Machines and Systems (ICEMS)
Year: 2023 | Conference Paper |
Aiming to improve the output performance of the doubly salient electromagnetic generator, an advance phase changing control (APCC) method based on the half-controlled rectifier is proposed. The difference between the half-controlled rectifiers with upper bridge arm and lower bridge arm with different control methods is obtained through modal analysis. The standard angular position control method l...Show More
Online Fault Detection and Location in Exciter Rotor Windings of the Wound-Rotor Synchronous Starter-Generator Under the Full Process
IECON 2023- 49th Annual Conference of the IEEE Industrial Electronics Society
Year: 2023 | Conference Paper |
In this paper, an accurate and timely fault diagnosis method for exciter rotor windings of the wound-rotor synchronous starter-generator (WRRSG) is proposed. Traditional methods are mostly based on the estimation of the rotor current, and cannot detect the fault in both start-up and generation modes. To overcome these difficulties, the proposed method uses the sum of squared stator currents of the...Show More
Fault Diagnosis of Rotating Rectifier in Aircraft Wound-Rotor Synchronous Starter–Generator Based on Stator Currents Under all Operational Processes
Accurate and timely fault diagnosis of the rotating rectifier in aircraft wound-rotor synchronous starter/generator (WRSSG) is very important for improving system reliability. Through the analysis of the stator excitation current of the main exciter (ME) with the rotating rectifier under various working conditions (healthy, open-circuit fault, and short-circuit fault), a novel fault diagnosis meth...Show More
Aircraft Brushless Wound-Rotor Synchronous Starter–Generator: A Technology Review
With the rapid development of more-electric aircrafts, integrated starter–generator (ISG) with less volume and weight has become the development trend in aircraft power system applications. Advantages of high reliability and excellent power generation quality make the brushless wound-rotor synchronous starter–generator (BLWRSSG) most attractive candidate for the ISG system in aircraft application....Show More
A Robust Lidar SLAM System Based on Multi-Sensor Fusion
2022 11th International Conference on Control, Automation and Information Sciences (ICCAIS)
Year: 2022 | Conference Paper |
Cited by: Papers (4)
In this paper, we propose a LiDAR-based multi-sensor fusion SLAM system that integrates magnetometer, odometer and IMU information to solve the problem of accuracy degradation of lidar SLAM algorithm in scenes with insufficient structural features. In the lidar odometer part, based on the feature-based point cloud matching algorithm, magnetometer and odometer constraints are introduced to improve ...Show More
Background Extraction and Objects Segmentation with 3D Roadside LiDAR under Snowy Weather
2022 IEEE 25th International Conference on Intelligent Transportation Systems (ITSC)
Year: 2022 | Conference Paper |
Cited by: Papers (2)
This paper proposes a new method to extract background and segment targets from point clouds collected by three-dimensional roadside LiDAR in snowfall weather. Background point extraction and target segmentation are two main problems in environmental perception based on roadside LiDAR. This paper first introduces a new background filtering algorithm, which uses the historical point cloud sequence ...Show More
Objects Detection With 3-D Roadside LIDAR Under Snowy Weather
Pengpeng Sun;Chenghao Sun;Lingfeng Wan;Runmin Wang;Xiangmo Zhao
Rain and snowfall will increase noise, change the resolution of objects in the point cloud and present great challenges to the accurate recognition of traffic objects. Accordingly, this article proposes an efficient real-time method for roadside 3-D light detection and ranging (LIDAR) background point cloud extraction and object segmentation under snowy weather. We first use a historical point clo...Show More
Fault Diagnosis of a Rotating Rectifier in a Wound-Rotor Synchronous Starter/Generator in the Generation Mode
Chenghao Sun;Weiguo Liu;Xu Han;Ningfei Jiao;Ke Shen;Rui Wang;Shuai Mao;Kunming Wang
Accurate and timely fault diagnosis of the rotating rectifier for a wound-rotor synchronous starter/generator is of great importance to improve system reliability. In the generation mode of the system, there is one idle stator winding of the main exciter. The terminal voltage characteristic of the idle stator winding is analyzed, and a novel fault diagnosis method for the rotating rectifier in the...Show More
Rotor Position Estimation Method of Brushless Electrically Excited Synchronous Starter/Generator Based on Multistage Structure
Rui Wang;Weiguo Liu;Tao Meng;Ningfei Jiao;Xu Han;Chenghao Sun;Yang Yang
This article proposes a rotor position estimation method for brushless electrically excited synchronous starter/generator (BEESSG) at low speed region. Based on the multistage characteristics of BEESSG, two high frequency pulsating voltages with different frequencies are injected into phase $\alpha$ and phase $\beta$ of stator of the main machine simultaneously. The rotor position is estimated by ...Show More
High-Frequency Voltage Injection-Based Fault Detection of a Rotating Rectifier for a Wound-Rotor Synchronous Starter/Generator in the Stationary State
Chenghao Sun;Weiguo Liu;Xu Han;Xiaoke Zhang;Ningfei Jiao;Shuai Mao;Rui Wang;Yi Guan
Fault detection of a rotating rectifier for a wound-rotor synchronous starter/generator (WRSSG) without a rotor position sensor in the stationary state is necessary for a successful engine start. Based on high-frequency (HF) voltage injection, a novel fault detection method of the rotating rectifier for the WRSSG in the stationary state is proposed. The rotating HF voltage is imposed on the stator...Show More
Double-Side Voltage-Behind-Reactance Model of Brushless Exciter in Aircraft Wound-Rotor Synchronous Starter-Generator Considering Magnetic Saturation
Ningfei Jiao;Chenghao Sun;Xiaoke Zhang;Xiaoli Duan;Weiguo Liu
The brushless excitation structure characteristics of the aviation wound-rotor synchronous starter/generator (WRSSG) put forward the requirement on the brushless exciter (BE) model that both the stator and rotor windings can be interfaced with the external circuit directly. In this paper, a double-side variable-parameter voltage-behind-reactance (DS-VP-VBR) model of the BE considering magnetic sat...Show More
Online Fault Diagnosis for Rotating Rectifier in Wound-Rotor Synchronous Starter–Generator Based on Geometric Features of Current Trajectory
Ningfei Jiao;Xu Han;Zhihuang Wei;Chenghao Sun;Peixin Liang;Weiguo Liu
Accurate and timely fault diagnosis of the rotating rectifier in wound-rotor synchronous starter-generator (WRSSG) plays an important role in improving the reliability of the WRSSG system. By analyzing the geometric features of the rotor current trajectory of the main exciter (ME) under health and different fault conditions of the rotating rectifier, in this article, a fault diagnosis method for t...Show More
On-Line Fault Diagnosis for Rotating Rectifier in Wound-Rotor Synchronous Starter/Generator Using Idle Field Winding
Chenghao Sun;Weiguo Liu;Qian Jia;Xu Han;Rui Wang;Ningfei Jiao
2020 23rd International Conference on Electrical Machines and Systems (ICEMS)
Year: 2020 | Conference Paper |
Based on the terminal voltage of the idle field winding of the main exciter, a novel fault diagnosis method for the rotating rectifier of the wound-rotor synchronous starter/generator in the generator mode has been proposed. Instead of complex signal processing, simple calculation is adopted to achieve one diode open-circuit and short-circuit fault detection. To be specific, the terminal voltage o...Show More
Online MTPA Control of Wound Rotor Start-Generator Drives Considering Cross-Coupling Effect
Ji Pang;Ningfei Jiao;Xiaoli Duan;Yuduo Zhang;Weiguo Liu;Chenghao Sun
2020 23rd International Conference on Electrical Machines and Systems (ICEMS)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
The cross-coupling effect is the most common phenomenon in the electric machinery operation, it has the influence on the machine efficiency and control scheme. However, the cross-coupling effect is ignored by the existing Virtual Signal Injection (VSI) Maximum Torque Per Ampere (MTPA) control. In this paper the online MTPA control based on the VSI scheme for Integrated Starter/Generator (ISG) syst...Show More
Online Searching MTPA Control of Wound Rotor Start/Generator Drives Considering Cross-Coupling Effect
Ji Pang;Weiguo Liu;Yong Zhao;Xu Han;Chenghao Sun;Ningfei Jiao
IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society
Year: 2020 | Conference Paper |
Cited by: Papers (2)
The cross-coupling effect is the most common phenomenon in the electric machinery operation, it has the influence on the machine efficiency and control scheme. However, the cross-coupling effect is ignored in the existing virtual signal injection (VSI) maximum torque per ampere (MTPA) control. In this paper, the online searching MTPA control based on VSI scheme for Integrated Starter/Generator (IS...Show More
Rotating Rectifier Failure Detection for Brushless Synchronous Starter/Generator in the Generator Mode
Chenghao Sun;Weiguo Liu;Xiaoli Duan;Xu Han;Rui Wang;Ningfei Jiao
IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society
Year: 2020 | Conference Paper |
Cited by: Papers (1)
A novel failure detection method for rotating rectifier of the brushless synchronous starter/generator in the generator mode has been proposed. In this method, the terminal voltage of the idle field winding of the main exciter is used. Firstly, the first maximum voltage and corresponding position in the voltage sample sequence are obtained. On this basis, the voltage sample sequence is reconstruct...Show More
Online Diode Fault Detection in Rotating Rectifier of the Brushless Synchronous Starter Generator
Ji Pang;Weiguo Liu;Zhihuang Wei;Chenghao Sun;Ningfei Jiao;Xu Han
The rotating rectifier in the brushless synchronous starter/generator is more vulnerable than others. Therefore, fault detection of the rotating rectifier is necessary. This article focuses on the identification of the diode failures in the rotating rectifier of the brushless synchronous starter/generator. Traditional approaches based on the analysis from the main exciter field current or main mac...Show More
Open-Circuit Fault Diagnosis of Rotating Rectifier by Analyzing the Exciter Armature Current
Based on the differences between waveforms of asynchronous exciter three-phase armature currents with the rotating rectifier under various working conditions (healthy and open-circuit conditions), a fault diagnosis method of rotating rectifier is proposed in this article. To describe these differences, the conceptions of ratio, residual, and sum are defined, and corresponding calculation functions...Show More
Influence of PM wedges in Wound-Rotor Synchronous Starter/Generator
2019 22nd International Conference on Electrical Machines and Systems (ICEMS)
Year: 2019 | Conference Paper |
Cited by: Papers (3)
In the starting mode, the exciter hardly provides enough field current for Main Generator to start the aircraft engine, owing to the low speed. In this paper PM wedges are used in the Wound-Rotor Synchronous Starter/Generator to improve the excitation field. By magnetized at tangential direction, installed adjacent salient wound-rotor poles, these PM-wedges combine parallel flux path with rotor fi...Show More
Fault-Tolerant Control of Position Sensor for Wound-Rotor Synchronous Starter/Generator
2019 22nd International Conference on Electrical Machines and Systems (ICEMS)
Year: 2019 | Conference Paper |
Cited by: Papers (3)
Accurate feedback of rotor position is necessary in a Wound Rotor Synchronous Starter/Generator (WRSSG) drive system, which is an great challenge to the reliability of position sensor. In case of failure of position sensor, this paper proposed a fault tolerant control (FTC) method for WRSSG based on Maximum Likelihood Voting (MLV) algorithm with two virtual sensors. When the position sensor fails,...Show More
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