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Study on the Cauer Thermal Network Model of Press Pack IGBTs

IOP Conference Series: Materials Science and Engineering 2018年第5期439卷

作者： Jinyuan Li Zhongyuan Chen Shouwen Liu Erping Deng Zhibin Zhao State Key Laboratory of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute of State Grid Corporation of China) Beijing 102209 China State Grid Hubei Electric Power Co. Ltd China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University) Beijing 102206 China

Press Pack IGBTs (PP IGBTs) has been gradually applied in the high voltage and high current areas, for its high power density, double side cooling and high reliability. The cauer thermal network model of PP IGBTs is proposed based on the boundary effect according to heat spreading angle in this paper, and the difference between the IGBT and FRD chips is considered in this model. The thermal contact resistance among multi-layers within PP IGBTs, which is calculated and corrected by the experiment, is also included in this model. The finite element method (FEM) model is used to verify the accuracy of the cauer model, because the accurate measurement of the junction to case thermal resistance of PP IGBTs is extremely difficult. The thermal characteristic of PP IGBTs under different clamping force can be acquired through the cauer thermal model. It has significant influence on the thermal resistance optimization, as the thermal resistance percentage of the components in PP IGBTs can be obtained from the cauer thermal model.

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Study on The Issue of Electric Field Concentration in Submodule of Press Pack IGBT

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IOP Conference Series: Earth and Environmental Science 2018年第5期189卷

作者： Jinyuan Li Zhongyuan Chen Xinling Tang Sun Junda Zhibin Zhao State Key Laboratory of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute of State Grid Corporation of China) Beijing 102209 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University) Beijing 102206 China

There is a phenomenon that the chips of press pack IGBT (Insulated Gate Bipolar Transistor) meet the requirements of withstand voltage test, but ignition sometimes occurred in the submodules of the same kind of press pack IGBT during the test. In response to this situation, this paper firstly analyzed that the difference of submodules frame lead to different level of electric field concentration. In this paper, quantitative conclusions have been drawed by modeling and simulation of the actual situation in COMSOL Multiphysics the multiphysics finite element simulation software.

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Analysis of Harmonic Characteristics of Asymmetric Bridge Arm Parameters in MMC

Analysis of Harmonic Characteristics of Asymmetric Bridge Ar...

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IEEE Conference on Energy Internet and Energy System Integration

作者： Sichao Wang Jun Wen Dongshan He Xiaohong Geng Ling Zhang Yongjun Cai Zhongyou Luo Meng Tan School of Electrical and Electronic Engineering North China Electric Power University Beijing China State Grid Xinjiang Electric Power Co. Ltd. Urumchi China Xinjiang CITIC Jinyuan Power Technology Co. Ltd. Urumchi China State Grid Xinjiang Electric Power Co. Ltd. Electric Power Research Institute Urumchi China State Key Laboratory of Advanced Transmission Technology Global Energy Internet Research Institute Beijing China

Modular multilevel converter (MMC) have many advantages over traditional voltage source converters. It is used more and more widely. However, it is inevitable to run in an unsatisfactory situation actually. The asymmetry of the bridge arm inductance parameter causes imbalance in the operating conditions, which causes harmonic problems on the AC side and the DC side in turn. In this paper, the average switching function theory is used to establish the harmonic mathematical model of bridge arm voltage and phase-to-phase circulation for analyzing the phase voltage and DC current of the AC port. It shows that asymmetry of the single-phase bridge arm inductance will cause the asymmetrical odd-order harmonic in the circulation, and asymmetry of phase bridge arm parameters causes asymmetrical even harmonic. The harmonic amplitude is positively related to the asymmetry. The asymmetry of bridge arm introduces DC component and even harmonics such as second harmonic into the AC port;The fluctuation on the DC side is mainly based on fundamental frequency, double frequency and triple frequency. The simulation results verify the correctness of the proposed mathematical model and the law.

关键词： Modular multilevel converter Bridge arm asymmetry Average switching function Harmonic characteristics

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Analysis of transient current distribution characteristics of Press Pack IGBT

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IOP Conference Series: Earth and Environmental Science 2018年第5期189卷

作者： Jinyuan Li Yaosheng Li Peng Wang Zhibin Zhao State Key Laboratory of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute of State Grid Corporation of China) Beijing 102209 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University) Beijing 102206 China

In the switching process of Press Pack IGBT (PPI) module, the phenomenon of nonuniform current distribution invariably happens which reduce the reliability and life time of chips and the module. The uneven current distribution would be caused by some physical reasons such as the clamp force, the temperature; and the electrical reasons including the parasitic inductance of the emitter pillars, the parasitic resistance of the gate connector and the difference of the paralleled chips characteristic, etc. Based on the modeling of two disparate module structures, the parasitic parameter of the emitter pillars and gate connector is extracted in this paper. Then the different equivalent circuits of PPI module are built due to the researches in different factors with the Synopsys Saber software. At last, by comparing the influence of two modules indifferent factors, the simulation results prove the relationship between the pillars distribution and the chip switching losses.

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Behavior of SiC MOSFET under Short-Circuit during the On-state

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IOP Conference Series: Materials Science and Engineering 2018年第2期439卷

作者： Meiting Cui Jinyuan Li Yujie Du Zhibin Zhao State Key Laboratory of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute of State Grid Corporation of China) Beijing 102209 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University) Beijing 102206 China

This paper presents behavior of SiC MOSFET under short-circuit during the on-state conditions. Although much research has been conducted on the short-circuit characteristics of the first type of SiC MOSFETs, no paper has reported the second type. A set of test benchs which can perform the second type of short-circuit are designed. Simulation by LTspice combined with experiments are conducted to evaluate the influences of several important parameters like miller capacitance, gate resistance, gate-source voltage, drain-source voltage on the second type of short-circuit characteristics of 1200 V/36 A SiC MOSFET.

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Space charge and DC breakdown behavior of natural ester impregnated insulation paper with different ageing condition

Space charge and DC breakdown behavior of natural ester impr...

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International Symposium on Electrical Insulating Materials

作者： Runhao Zou Jian Hao Ruijin Liao Lijun Yang Qian Wang State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University State Grid Chongqing Electric Power Co. Chongqing Electric Power Research Institute Chongqing China

ISBN: (纸本)9781509064601

Mineral oil is widely used in the transformers as insulation oil because of its preferable low price, good insulation quality and a relatively low condensation point. However, with the consideration of the fact that it almost does not degrade which can cause the contamination of soil, water and our living environment; While on the other hand that fossil fuel would be a scarce resource for the 21st century, it becomes urgent for the researchers to find out its alternative. Natural ester drew the researchers' attention in the 1990s because of the fact it can degrade thoroughly, renewable, and has a better fire safety quality. In order to ensure the long term safety of the equipment using natural ester as insulating fluid under DC operation condition, it is necessary to understand the space charge characteristics of the insulation paper impregnated in natural ester. A thermal accelerated ageing experiment was performed on paper impregnated in natural ester at 130 °C. Samples were collected respectively in different days. The space charge distribution analysis was applied on these samples with different electric field respectively using the PEA method. With further degree of thermal ageing, the space charge injection became easier and the amount of its injection increased. The space charge injection threshold voltage was found using ramp test, and the thermal ageing would reduce the space charge injection threshold voltage. The space charge effect on the DC breakdown voltage of natural ester impregnated insulation paper is weaker than the mineral oil impregnated insulation paper after being aged for same time.

关键词： Space charge Aging Minerals Insulation Threshold voltage Oils Voltage measurement

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Fault isolation characteristics of the hybrid DC circuit breaker

Fault isolation characteristics of the hybrid DC circuit bre...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Bingjian Yang Zhiyuan He Haoyu Ma Huafeng Wang Yi Lu Peng Qiu Pengxiang Huang Global Energy Interconnection Research Institute Co. Ltd. Beijing China State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of High Power Electronic Beijing China Zhejiang Electric Power Company Electric Power Research Institute of State Grid

ISBN: (纸本)9781538614280

The topologies and operation principles of the hybrid Direct Current Circuit Breaker (DCCB) are present in this paper. The equivalent circuits of the hybrid DCCB in different period of the current breaking process are obtained. Then the fault current path of DC double pole short-circuit fault, monopole grounding fault, single phase to ground fault and the fault isolation characteristics of the hybrid DCCB during these fault are analyzed. The hybrid DCCB can isolate the fault lines from the converter stations, and can isolate the converter station if fault occurs in the AC side or in the converter, avoiding influences on another converter station. During current interrupting, the transient breaking voltage of the hybrid DCCB is added to the DC line voltage, then the insulation requirements of the DC line and DC equipment increase. Finally, simulations about hybrid DCCB isolating fault effect are carried to verify the analytical results.

关键词： Circuit faults Fault currents Circuit breakers Insulated gate bipolar transistors HVDC transmission Capacitors Converters

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DC Emergency power Control Strategy for AC/DC Multi-Channel Interconnected System

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Energy and power Engineering 2017年第4期9卷 735-747页

作者： Yicong Wang Dejun Shao Zhiqiang Zhang Youping Xu Xiaojie Pan Haishun Sun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Central China Branch of State Grid Corporation of China Wuhan China China Electric Power Research Institute Beijing China

Inter-regional transmission line fault often results in power flow transferring, tie-line overloading and system islanding. Traditional control methods such asgenerator tripping and load shedding are costly, and also have undesirable impacts on theloadside. In this paper, a new emergency power control strategy is proposed for multi-channel interconnected system by using the overload capacity of non-fault DC lines. First of all, the capacity of emergency power control can be acquired by critical transmission power of a certain tie-line for stability. Secondly, the shortest electric distance can be calculated by Dijkstra algorithm, and then the priority of emergency control of the DC lines can be obtained by the entropy weight method. When the inter-regional transmission power decreases and the effect of single DC line emergency control is poor, the multi-channel cooperative emergency control strategy is proposed to ensure the system stability. Simulation results verify the effectiveness of the method proposed.

关键词： DC Emergency Control Critical Stable transmission power Dijkstra Algorithm Entropy Weight Multi-Channel Cooperated Emergency Control

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Research on Mechanism and Model of Centralized Bidding for Pumped Storage power in Shanghai

Research on Mechanism and Model of Centralized Bidding for P...

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2017 2nd Asia Conference on power and Electrical Engineering (ACPEE2017)

作者： ZHONG Hua YING Zhiwei LV Zhengyu YANG Jianlin HUANG Yupeng DONG Li Shanghai Electric Power Trading Center Limited Company State Grid Shanghai Municipal Electric Power Company Economic and Technical Research Institute Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment (Southeast University)

China is now in the transition stage toward power market and in some specific area, market approach has already been adopted to improve the overall efficiency. In this paper, Bidding and trading modes of pumped storage energy in various regions of China are analysed. Based on the constraints of bidding price and electricity, as well as the system power flow, the trading model is established to collect the capacity cost of pumped storage energy in Shanghai. With the trading model proposed, that the generators who actively undertake the capacity cost of pumped storage energy and bid enough electricity with lower price can be rewarded, while those attempts to conspire and manipulate the market will be penalized. Finally, using seven generators in Shanghai as examples to simulate the market operation, the effectiveness of the proposed model is verified.

关键词： Research on Mechanism and Model of Centralized Bidding for Pumped Storage power in Shanghai Model

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A new method to extract stray inductance in IGBTs' Dynamic testing platform

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IOP Conference Series: Materials Science and Engineering 2018年第2期439卷

作者： Xinling Tang Yan Pan Peng Zhang Zhibin Zhao State Key Laboratory of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute of State Grid Corporation of China) Beijing 102209 China Dtate Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University) Beijing 102206 China

Stray inductance in IGBTs' dynamic testing platform has great influence on switching characteristics, such as switching speed, switching loss, voltage overshoot, and so on. Conventional methods are analyzed in this paper, which cannot extract stray inductance accurately due to existence of resistance in power stage current path. A new method is proposed in this paper to extract stray inductance based on turn-off transient waveform and a following turn-on transient waveform. In this method, it is assumed that capacitor voltage and load current are constants during turn-off transient and the following turn-on transient, and then the stray inductance is extracted accurately by using gradients of both turn-off current and turn-on current at a given current value. The new method eliminates the influence of resistance in current path. To verify the proposed method, circuit simulation is carried out by using Synopsys Saber; furthermore, an IGBT dynamic testing platform is developed, stray inductance of the testing platform is extracted under different voltage levels. Simulation and measurement results prove the effectiveness of the new method. Insulated gate bipolar transistors, electronic equipment testing, inductance measurement

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