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中国电机工程学会电力与能源系统学报（英文版）
中国电机工程学会
中国电机工程学会电力与能源系统学报（英文版）

中国电机工程学会

季度

2096-0042

jpes@csee.org.cn

010-82812971

北京市海淀区清河小鹰东路15号100192

中国电机工程学会电力与能源系统学报（英文版）/Journal CSEE Journal of Power and Energy SystemsCSCDCSTPCD北大核心SCI
查看更多>>《 CSEE电力与能源系统杂志》（JPES）致力于报道电力与能源系统领域学术研究的新发展。
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    Hybrid Model of Power Transformer Fault Classification Using C-set and MFCM-MCSVM

    Ali AbdoHongshun LiuYousif MahmoudHongru Zhang...
    672-685页
    查看更多>>摘要：This paper aims to increase the diagnosis accuracy of the fault classification of power transformers by introducing a new off-line hybrid model based on a combination subset of the et method(C-set)& modified fuzzy C-mean algorithm(MFCM)and the optimizable multiclass-SVM(MCSVM).The innovation in this paper is shown in terms of solving the predicaments of outliers,boundary proportion,and unequal data existing in both traditional and intelligence models.Taking into consideration the closeness of dissolved gas analysis(DGA)data,the C-set method is implemented to subset the DGA data samples based on their type of faults within unrepeated subsets.Then,the MFCM is used for removing outliers from DGA samples by combining highly similar data for every subset within the same cluster to obtain the optimized training data(OTD)set.It is also used to minimize dimensionality of DGA samples and the uncertainty of transformer condition monitoring.After that,the optimized MCSVM is trained by using the(OTD).The proposed model diagnosis accuracy is 93.3％.The obtained results indicate that our model significantly improves the fault identification accuracy in power transformers when compared with other conventional and intelligence models.
      原文链接:
    • 国家科技期刊平台
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    Limits of Uneven Battery Power in Modular Multilevel Converter-based Battery Energy Storage Systems

    Yao PanXiaofeng SunWei ZhaoXin Li...
    686-695页
    查看更多>>摘要：For modular multilevel converter-based battery en-ergy storage systems(MMC-BESS),uneven power among bat-teries of SMs will be deduced by battery aging,battery fault,etc.,which will degrade performance and even lead to system failure.For maintaining the balance of capacitor voltage,this paper analyzes the limits of the uneven power of batteries,which are presented as the current limits in this paper.According to analysis,an analytical method is proposed that only the dc and fundamental frequency components of the arm current are used to calculate current limits.With the current limits it is able to evaluate the reasonability of power distribution among batteries.Meanwhile,increase of fundamental frequency component will enhance the current limits,and the dc component determines the size relationship between the absolute values of the upper and lower current limits.Finally,simulation model and experiment prototype are built for verifying the theoretical analysis and current limits calculation method,and satisfactory results are provided.
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    • 国家科技期刊平台
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    H∞ Robustness for Distributed Control in Autonomous Microgrids Considering Cyber Disturbances

    Ge CaoGuannan LouWei GuLina Sheng...
    696-706页
    查看更多>>摘要：The physical connections and logical relationships between microgrids and communication networks allow micro-grids to develop into typical cyber-physical systems(CPSs).With the extensive use of open communication mechanisms,the impact of cyber disturbances in public communication networks cannot be diminshed.In this paper,a parameter optimal method for a distributed secondary controller based on the robust control theory and consensus algorithm is presented to enhance the robustness of a secondary control system under data disturbance,parameter perturbation,and time delay.First,a distributed secondary control strategy of microgrids is demonstrated that coordinates frequency and voltage restoration and power sharing.Then,considering the impact of cyber events on the secondary control,a distributed robust controller gain design method is proposed to satisfy the H∞performance index.The solution of the distributed robust control is transformed into a linear matrix in equation problem and latency margin is simultaneously obtained.Finally,a test microgrid CPS is simulated with and without time delay to investigate the impact of cyber events on system operational states and the effectiveness and robustness of the proposed method.
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    • 国家科技期刊平台
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    Design and Experimental Testing of a Moving Coil Actuator with Compensation Coils

    Boyuan YinXianwu ZengJohn Frederick EasthamEmelie Nilsson...
    707-716页
    查看更多>>摘要：Hydrogen-powered electric aircraft have attracted significant interests aiming to achieve decarbonization targets.Onboard DC electric networks are facing great challenges in DC fault protection requirements.Vacuum interrupters are widely used in low voltage and medium voltage power systems due to being environmentally friendly with low maintenance.In this pa-per a moving coil actuator with compensation coils for a vacuum interrupter,as part of a hybrid direct current circuit breaker,is designed and experimentally tested.Compensation coils are used to improve operating speed compared with original moving coil actuator.Comparisons between four possible connections of compensation coils and original moving coil actuator are carried out.Experimental results show comparisons between different connections of actuator coils in terms of opening time and coil current with a range of pre-charged capacitor voltages.Dynamic performance of each actuator connection is also compared.The actuator with compensation coils is shown to have a higher current rising rate and achieve faster opening speed,which is a critical requirement for electric aircraft network protection.The parallel connection actuator achieves the highest opening speed within 3.5 ms with capacitor voltage of 50 V.
      原文链接:
    • 国家科技期刊平台
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    A New Method for the Aging Evaluation of Oil-paper Insulation Using n-Butanol and Methanol

    Jianyi WangYuanxiang ZhouJun LiuZhaowei Wang...
    717-726页
    查看更多>>摘要：To improve the accuracy and efficiency of the aging life prediction and assessment of transformer oil-paper insulation,and to make up for the deficiencies of traditional characterizers,such as 2-furfural,carbon monoxide,and carbon dioxide,a method for the simultaneous determination of methanol,ethanol,n-propanol,and n-butanol in oil with a single injection is estab-lished by headspace-gas chromatography-mass spectrometry.The measured results show that the determination limits of the four alcohol characterizers can be controlled to 10 μg/kg level.Based on this method,the change patterns of the above four alcohols with thermal aging time and degree of polymerization are ob-tained through thermal aging experimental research.Ethanol,n-propanol,and n-butanol in oil indicate nearly linear correlations with thermal aging time and degree of polymerization,similar to that of methanol.By analyzing 52 sets of measured data of 500 kV EHV transformers in operation,n-butanol is found to have excellent performance,and a new method to evaluate the aging state of oil-paper insulation employing n-butanol and methanol is proposed along with the aging attention value model.The measured data of 500 kV EHV transformers in operation indicate that the combination of n-butanol and methanol as the preferred characterizers can effectively compensate for the shortcoming of traditional characterizers in the early stages of aging,and the feasibility of the method is verified.Two possible pathways for the generation of n-butanol by cellulose cleavage during the aging of oil-paper are proposed from the chemical structure of cellulose.
      原文链接:
    • 国家科技期刊平台
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    Insulation Design Rule for a Spacer in SF6/N2-filled DC Gas Insulated Apparatus

    Hongyang ZhouMeng ZhangGuoming MaCong Wang...
    727-735页
    查看更多>>摘要：A recurring challenge of a DC SF6/N2-filled GIS/GIL apparatus is the charge accumulation at DC stress.The conventional design rules and knowledge of AC spacers may not be applicable for this new type of apparatus.A novel design rule is proposed considering the effect of accumulated charge on the threshold of electric field strength being resistant to the superposed voltage.A surface charge accumulation simulation model is introduced,and the key parameters in the simulation model are measured.In addition,an experimental platform for a 100 kV spacer flashover test is established.Spacer flashover tests under superimposed voltage with opposing polarities are carried out,and the withstanding voltage of the spacer is obtained.Finally,based on the proposed model,the threshold of the surface electric field strength(tangential component)on the DC spacer in SF6/N2 mixed gases is discussed.For a reliable insulation design of a DC GIS/GIL apparatus filled with 0.7 MPa SF6/N2,the threshold of surface electric field strength on the DC spacer is 12 kV/mm.The insulation design rule can be referenced in the design of a high-voltage DC SF6/N2-filled GIS/GIL apparatus.
      原文链接:
    • 国家科技期刊平台
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    Characteristics of Bi-2223 HTS Tapes Under Short-circuit Current Impacts in Hybrid Energy Transmission Pipelines

    Yuguang SunChao YinWeizhen LiXinyang Li...
    736-745页
    查看更多>>摘要：A hybrid energy transmission pipeline is proposed with the aim of long-distance cooperative transmission of elec-tricity and chemical fuels,which is composed of an inner high-temperature superconducting(HTS)power cable and outer liquefied natural gas(LNG)pipeline.The flowing LNG could maintain the operating temperature of the inner HTS power cable within the range of 85 K-90 K,thus the Bi-2223 superconductors in the HTS power cable produce little Joule loss with the transmission current below the critical current.Owing to the advantages of high power density,low transmission losses and economical manufacturing costs,the hybrid energy transmission pipeline is expected to be widely utilized in the near future.In order to ensure the safety of the HTS power cable and explosive LNG in case of short-circuit faults,this paper tests and analyzes the characteristics of Bi-2223 HTS tapes of the Type HT-CA,Type HT-SS and Type H models under short-circuit current impacts at the LNG cooling temperature(85 K-90 K).An experimental platform is designed and established for the ampacity tests of HTS tapes above LN2 cooling temperature(77 K).The AC over-current impact tests at 85 K-90 K are carried out on each sample of Bi-2223 tapes respectively,and the experimental results are analyzed and compared to evaluate their performances under different operating conditions.The results indicate that the Type HT-CA tape can withstand 50 Hz short-circuit current impact with the amplitude of 1108 A(10 times of critical current Ic)for 100 ms at 90 K,and its resistance is the smallest of the three tested samples under similar current impacts.Therefore,the Type HT-CA Bi-2223 tape is the optimal superconductor of the HTS power cable in the hybrid energy transmission pipeline.
      原文链接:
    • 国家科技期刊平台
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    Influence of Repetitive Impulse Waveforms on Surface Discharge Characteristics and Insulation Life for Polyimide Film

    Zhiyun HanQingmin LiYujin GuoTao Liu...
    746-755页
    查看更多>>摘要：Accelerated insulation aging problems under high frequency repetitive impulses in power electronic transformers are drawing more and more attention in modern power sys-tems.Partial discharge(PD)characteristics including discharge inception voltage,phase distribution and statistical characteristics on polyimide(PI)surface under different impulse waveforms and the insulation life of PI films are studied in this paper.We carry out experiments based on PD and insulation lifetime test systems,using five different types of repetitive impulses,including three bipolar waves and two unipolar waves.The ex-perimental results show that there is little variation in discharge inception voltage under different waveforms,but great variation in phase distribution and statistical characteristics of PD.In addition,insulation life is approximately the same under different waveforms with the same polarity,and the aging rate under bipolar waveforms is larger than that under unipolar waveforms.We explain the differences between the bipolar and unipolar waveforms on insulation life,which can be concluded that the surface charge under unipolar waveform accumulates more significnatly compared with bipolar waveform and decreases the electric filed strength in discharging the air gap and inhibits surface discharge from occurring.
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    • 国家科技期刊平台
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    High Power Density EV Integrated Fast Battery Chargers Based on the General Torque Cancelation Law for Three-phase Motors

    Yanxiong LeiGuiping DuTuhuan LiWenjie Ma...
    756-766页
    查看更多>>摘要：Integrated battery chargers are highly effective for saving costs and improving the power density of on-board chargers in electric vehicles(EVs).However,achieving torque elimination of the commonly used three-phase(3p)motors during the fast-charging process is challenging.In this paper,the general torque cancelation law applied in 3p permanent magnet syn-chronous motors(PMSMs)and induction motors(IMs)is derived to design high power density integrated fast battery chargers.Two novel integrated systems with fast-charging and vehicle-to-grid(V2G)capabilities are proposed based on this law.The main advantages of the proposed systems are:(1)Two filter inductors are constituted by the stator windings while charging,and only one external inductor and several contactors are supplemented to the motor-drive circuit.Therefore,the proposed integrated systems possess high power density;(2)The 3p open-winding(OW)motor is employed,with no need to modify the propulsion system or redesign the interior structure of the motor;(3)Employing an individual controller for each phase of the inner current loop control,the proposed systems realize unity power factors and low current harmonics in the fast-charging and V2G mode.Simulation and experimental results verify the feasibility of the proposed topologies and control strategies.
      原文链接:
    • 国家科技期刊平台
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    Design of Robust Var Reserve Contract for Enhancing Reactive Power Ancillary Service Market Efficiency

    Yunyang ZouYan Xu
    767-771页
    查看更多>>摘要：In a deregulated Var market,market power issue is more serious than in an energy market since reactive power cannot be transmitted over long distances.This letter designs a multi-timescale Var market framework,where market power that may arise in the hourly-ahead Var support service market due to system configuration deficiency and market structure flaws can be eliminated by day-ahead contract-based Var reserve service market.Settlement of day-ahead Var reserve contract is formulated as a two-stage robust optimization(TSRO)model considering worst case of uncertainty realization and potential market power that may arise in hourly-ahead market.TSRO with integer recourses is then solved by a new column and constraint generation algorithm.Results show a robust Var reserve contract can fully eliminate market power,and prevent suppliers from manipulating market prices.
      原文链接:
    • 国家科技期刊平台
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