Accelerated Life Test Study on Thyristors of HVDC Converter Valve

Cuicui Liu,Ning Liang,Yating Gou,Jiachen Tian,Fang Zhuo,Feng Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

As the key component of HVDC converter valve system, thyristors have vital impact on the reliability of the entire HVDC transmission project. In order to effectively obtain the life model of thyristor, this paper uses the existing accelerated life test theory, combined with the operating conditions of the converter valve and the relevant characteristics of the thyristors, to deeply analyse the several stress levels that have the most serious impact on the life of the thyristors. An accelerated life test scheme that can effectively guide the life model of the thyristor, according to the test data collected by this test method, the thyristor junction temperature life model under the short-circuit current stress is established, and compared with the thyristor failure rate in the practical engineering, the results show the feasibility of the test scheme and the correctness of the life model.

A Study on Control Algorithm of Thyristor Dual Converter System for DC Electricity Supply of Urban Railway

서승삼,한성우 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.2

Most of systems that supplying electric power to operate an electric train of an urban railway to supply power by converting AC into DC through trolly wire, there are two rectifi cation methods to converting AC into DC, with diodes or thyristor. Rectifi cation method using thyristor is composed by 12 pulse thyristor converter with forward and reverse connection. Forward connection thyristor converter supplies electric power to trolly wire as forward mode operation, Reverse connection thyristor converter returns surplus trolly wire voltage to AC top main when regenerative electric power occurs according to regenerative braking, which reduces 20% operating power of an electric train. Rectifi cation method using thyristor is appropriate for an electric train of an urban railway for improving operation effi ciency and reducing greenhouse gases. In this paper, propose a dual converter using thyristor system for an urban railway substations and a control algorithm, and the validity of the proposed control technique is verifi ed by the fabrication and experiment of 10 kW scale reduction model.

전기자동차 구동 전동기의 고효율 운전을 위한 싸이리스터 소자 적용 전동기 직병렬 권선 절환 회로 연구

신양진(Yangjin Shin),조수연(Suyeon Cho),정호창(Hochang Jung),조재익(Jaeick Cho),신외경(Waegyeong Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4

자동차 시장은 유가변동에 따른 연료비 부담 심화 및 강화되는 이산화탄소 배출 규제 등의 영향으로 친환경 자동차 시장 확대와 함께 전기 자동차의 연비 향상을 위한 기술 개발 경쟁이 가속화되고 있다. 일반적으로 전기 자동차의 모터 구동 시스템은 넓은 속도 영역에서의 동작이 요구되지만 모터의 고효율 영역은 제한되어 있어, 실제 최빈 동작점인 도심 운전(저속 영역) 및 고속도로 운전(고속 영역)에서는 효율 저하가 발생한다는 문제점이 있다. 따라서 이러한 문제를 해결하기 위해 모터의 전 속도영역에서 고효율을 성취할 수 있도록 전기 자동차의 운전 속도에 따라서 모터 권선의 구조 변경을 통해 전자기적 특성을 바꿔주는 변속 시스템 개발이 요구되고 있다. 기존의 기계적 스위치로 구성된 변속 시스템의 경우 회로의 수명이 제한적이고 절환 시간이 길어 절환 시간 동안 모터의 전류 및 토크 단절이 발생한다는 문제가 있어 전기 자동차에 적용하는데 한계가 있다. 선진사 일본 야스가와 전기 사의 경우 적은 수의 전기적 스위치로 구성된 중성점 절체식 권선 절환 회로를 전기 자동차의 구동 시스템에 적용시켜 기계적 스위치를 사용한 권선 절환 방식의 수명 문제와 구동 단절 특성을 해결하여 절환 시간을 단축시켰다. 그러나 권선 절환 회로에서의 도통 손실이 크게 발생하여 전체 시스템의 효율을 저하시키며, 절환 시 발생하는 권선의 서지 에너지를 흡수하기 위해 별도의 스너버 회로가 필요하다는 단점이 있다. 제안하는 Thyristor 소자를 적용한 권선 절환 회로는 저속 운전에서는 모터 권선을 직렬로 연결, 고속 운전에서는 병렬로 연결시켜 직병렬로 권선 절환을 통해 전기 자동차의 넓은 속도 영역에서 고효율을 성취할 수 있도록 한다. 또한 기존 선진사 회로와 달리 권선 절환 시에 Thyristor 소자의 특성을 이용하여 과도 상태가 없는 절환을 할 수 있어서 별도의 스너버 회로가 필요 없다. 제안하는 Thyristor를 이용한 직병렬 권선 절환 회로는 구성하는 스위치 소자의 개수가 비교적 많아 별도의 드라이버 회로가 필요하다는 단점이 있지만, 전체 도통 손실이 선진사 회로에 비해 30%정도 저감되어 방열 시스템의 설계가 용이하고 그만큼 부피를 작게 할 수 있다는 장점이 있다. 제안한 권선 절환 회로의 타당성을 검증하기 위해 80kW 급 PMSM 과 인버터를 연계하여 동작을 검증하였다. This paper propose a series-parallel thyristor winding changeover circuit that can maximize the efficiency in the wide speed range to extend the driving distance of the Electric Vehicle. Proposed circuit is Series-Parallel changeover circuit based thyristor. Due to the characteristics of the thyristor, it is possible to achieve a seamless transient state without interruption. So no additional snubber circuit is required and high efficiency and light weight of AC motor system can be expected because of low switch loss. The proposed winding changeover circuit is validated through simulation and experimental results with 80kW AC motor.

Improved Trigger System for the Suppression of Harmonics and EMI Derived from the Reverse-Recovery Characteristics of a Thyristor

Wei, Tianliu,Wang, Qiuyuan,Mao, Chengxiong,Lu, Jiming,Wang, Dan The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6

This paper analyses the harmonic pollution to power grids caused by thyristor-controlled devices. It also formulates a mathematic derivation for the voltage spikes in thyristor-controlled branches to explain the harmonic and EMI derived from the reverse-recovery characteristics of the thyristor. With an equivalent nonlinear time-varying voltage source, a detailed simulation model is established, and the periodic dynamic switching characteristic of the thyristor can be explicitly implied. The simulation results are consistent with the probed results from on-site measurements. An improved trigger system with gate-shorted circuit structure is proposed to reduce the voltage spikes that cause EMI. The experimental results indicate that a prototype with the improved trigger system can effectively suppress the voltage spikes.

스위칭 특성을 고려한 전류형 HVDC 시스템의 댐핑회로 설계 적정성 검토

이철희(Chur Hee Lee ),김승완(Seung Wan Kim) 대한전기학회 2019 전기학회논문지 Vol.68 No.11

This paper deals with the evaluation on the design of thyristor snubber circuit for LCC(Line Commutated Converter) HVDC system. Snubber circuit consists of capacitance and resistance to protect thyristor in HVDC system. Based on turn off model, mathematical expressions are derived by considering the maximum device stress, maximum reverse dv/dt, and reverse energy loss of a power device. The total turn-off loss in the device with the associated snubber circuit is considered as stray inductance. In the case of determining ratio between resistance and capacitance, it is important to reflect their relation and the purpose of protecting thyristor. Considering these analytical solutions to 500kV HVDC system in Korea, we can calculate the range of maximum and minimum rate of the thyristor snubber circuit. This study can be applied to review the design of thyristor snubber circuit of HVDC projects.

Improved Trigger System for the Suppression of Harmonics and EMI Derived from the Reverse-Recovery Characteristics of a Thyristor

Tianliu Wei,Qiuyuan Wang,Chengxiong Mao,Jiming Lu,Dan Wang 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6

This paper analyses the harmonic pollution to power grids caused by thyristor-controlled devices. It also formulates a mathematic derivation for the voltage spikes in thyristor-controlled branches to explain the harmonic and EMI derived from the reverse-recovery characteristics of the thyristor. With an equivalent nonlinear time-varying voltage source, a detailed simulation model is established, and the periodic dynamic switching characteristic of the thyristor can be explicitly implied. The simulation results are consistent with the probed results from on-site measurements. An improved trigger system with gate-shorted circuit structure is proposed to reduce the voltage spikes that cause EMI. The experimental results indicate that a prototype with the improved trigger system can effectively suppress the voltage spikes.

Thyristor를 使用한 分相起動 單相誘導電動機의 起動switch改善에 關한 硏究

崔昌柱 조선대학교 생산기술연구소 1981 生産技術硏究 Vol.1981 No.-

The single phase induction motor is used widely for the starting apparatus of industrial machines and small size home implements. In order to start the single phase induction motor which is in use with little capacity, starting switch is generally adopted. This starting switch is mechanically operated by the centrifugal force. On account of the complex structure and high freguency in use, it is freguently broken down by defacement. In this viewpoint, in order to turn on and off the centrifugal starting switch fixed to the auxiliary winding in series without a point of contact, I make an attempt to improve conventional structure of starting switch by means of thyristor circuit through experiments.

Neuron Circuit Using a Thyristor and Inter-neuron Connection with Synaptic Devices

Rajeev Ranjan,Min-Woo Kwon,Jungjin Park,Hyungjin Kim,Byung-Gook Park 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.3

We propose a simple and compact thyristor-based neuron circuit. The thyristor exhibits bi-stable characteristics that can mimic the action potential of the biological neuron, when it is switched between its OFF-state and ON-state with the help of assist circuit. In addition, a method of inter-neuron connection with synaptic devices is proposed, using double current mirror circuit. The circuit utilizes both short-term and long-term plasticity of the synaptic devices by flowing current through them and transferring it to the post-synaptic neuron. The double current mirror circuit is capable of shielding the pre-synaptic neuron from the post synapticneuron while transferring the signal through it, maintaining the synaptic conductance unaffected by the change in the input voltage of the post-synaptic neuron.

小形 Induction motor 速度制御를 爲한 Thyristor gate trigger 回路에 關한 硏究

李愚宣,鄭憲相,金昌錫 朝鮮大學校 動力資源硏究所 1981 動力資源硏究所誌 Vol.3 No.1

This paper deal with the control anplifier circuits for wide range speed control of the single phase induction motor. The circuits are designed and implemented and it's characteristics is examined. In this poper the trigger circuits in the control anplifier circuits is dealt with the most important issue. The system is shown to give speed/torque proportion characteristics as a motor in the speed range from 20% to 90% of synchronous.

A Thyristor-based Seamless Winding Changeover Circuit for high efficiency of Electric Vehicle Drive System

Yangjin Shin,Sungyoul Park,Sewan Choi,Suyeon Cho,Hochang Jung,Junsung Park,Waegyeong Shin,Deokjin Kim 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

This paper propose a novel winding changeover circuit that can maximize the average efficiency in the wide speed range to extend the driving distance of the Electric Vehicle and improve the fuel efficiency. Proposed circuit is Series-Parallel changeover circuit based thyristor. Due to the characteristics of the thyristor, it is possible to achieve a seamless transient state without interruption. So no additional snubber circuit is required and high efficiency and light weight of AC motor system can be expected because of low switch loss. The proposed winding changeover circuit is validated through simulation and experimental results with 80kW AC motor.