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A NON-UNIT ADAPTIVE TRAVELING WAVE PROTECTION METHOD FOR FLEXIBLE dc TRANSMISSION LINES BASED ON SUPPLEMENT OF VOLTAGE DATA 12

A NON-UNIT ADAPTIVE TRAVELING WAVE PROTECTION METHOD FOR FLE...

引用

12th International Conference on Renewable Power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Yao, Kunpeng Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

Traveling wave (TW) protection is crucial for ensuring the safety and stability of flexible dc transmission lines. Thereinto, shortening the sampling step is the key to improve the sensitivity of the derivative-based TW protection. However, higher sampling frequency is difficult to engineer and the protection performance will be constrained in case of the high resistance faults. To address this issue, a non-unit adaptive TW protection based on the supplement of voltage data has been proposed. Firstly, the voltage data is realized to complement utilizing the Lagrange's median theorem at the line boundary, which improves the sampling frequency. Then, it has been observed that the fault current variation is negatively correlated with transition resistance. Specially, the proposed protection takes this fully into account by incorporating the adaptive threshold that covers differences among various fault locations. Therefore, the proposed protection can effectively distinguish internal faults with high sensitivity. Finally, a two-terminal ±500kV MMC-HVdc (modular multilevel converter-high voltage direct current) system is built using PSCAD/EMTdc. The simulation results demonstrate that the line faults can be fast and correctly identified, even with 300 Ω fault impedance, in various fault scenarios. © The Institution of Engineering & technology 2023.

关键词： Electric fault currents

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Offline Parameter Identification Method Considering the Nonlinear Characteristics of grid-connected Inverter Controller 12

Offline Parameter Identification Method Considering the Nonl...

引用

12th International Conference on Renewable Power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Jiang, Xinying Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

The correct model parameters play important role in fault characteristics analysis and protection design. It is a necessity to identify the parameters based on external characteristics due to the problem of parameters black-box. However, existing studies lack concerns in the nonlinear control of the control system during the transient, and cannot analysis the transient characteristics of the converter. Therefore, the inverter parameter identification method based on the dynamic model of phase-locked loop (PLL) is proposed in this paper. It is revealed that the influence of the dynamic process of PLL on the identification model. Considering the dynamic characteristics of PLL, a transient current identification model is established. A parameter identification method based on structural similarity (SSIM) was proposed. simulation examples show that the proposed parameter identification method can identify parameters accurately. © The Institution of Engineering & technology 2023.

关键词： Phase locked loops

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Influence of Cross-linking Characteristics of dc Cable Insulation on dc Performance

Influence of Cross-linking Characteristics of DC Cable Insul...

引用

International Conference on Electrical Materials and Power Equipment (ICEMPE)

作者： Wenpeng Li Weijia Zhao Weilong Peng Chong Zhang Xin Chen Lisheng Zhong State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an China Beijing Institute of Smart Energy Changping District Beijing China State Grid Zhoushan Power Supply Company Zhoushan China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

The high-voltage dc cross-linked polyethylene (XLPE) insulated cable is a critical component of the flexible dc transmission system. Its insulating materials must meet stringent requirements for properties such as dc conductivity, space charge, and dc breakdown field strength. Unfortunately, high-performance cable materials needed for dc XLPE cables have been monopolized by foreign companies for a prolonged period, which has become a major bottleneck for the development of high-voltage dc cables in China. In this study, we first sliced the domestic and imported cable insulations, then tested the cross-linking degree (gel content) and microstructure of the cable slice samples for both types of insulation while in the undegassed state. This paper explains the variations in the micro cross-linking characteristics of the two types of cables and introduces a time-frequency domain hybrid analysis method based on polarization current. The method calculates the low-frequency dielectric constant and dielectric loss angle tangent of the cable, along with their change laws. By doing so, we can assess the state of cross-linking by-products in the cable insulation, laying a theoretical and experimental foundation for establishing a real-time monitoring approach for the cable degassing process.

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Overvoltage Absorption of Sparse Modular Multilevel Converter

Overvoltage Absorption of Sparse Modular Multilevel Converte...

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China International Electrical and Energy Conference (CIEEC)

作者： Jiangyuan Li Mingyao Ma Yunfei Xu Bao Liu Chen Jia Institute of Power Electronics and Systems Hefei University of Technology Hefei China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350359558

ISBN: (纸本)9798350359565

A topology is presented that is designed to address overvoltage occurrences when the Sparse Modular Multilevel Converter (SMMC) changes voltage polarity. The proposed topology mitigates overvoltage induced by abrupt changes in bridge arm inductance current during voltage commutation. This is achieved by incorporating dual RCD buffer circuits connected in parallel at both ends of the SMMC bridge arm inductance. Additionally, design formulas for the capacitance and resistance in the dual RCD buffer circuits are derived based on the voltage commutation process and operating conditions of the SMMC. The effectiveness of the proposed topology and the design formulas for RCD parameters were validated through simulation.

关键词： Resistance Multilevel converters Inductance Bridge circuits Voltage Capacitance Topology

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A Micro Switch Based Modeling Method for LCC-HVdc System

A Micro Switch Based Modeling Method for LCC-HVDC System

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IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

作者： Lin Zhu Huaiguang Gu Shujing Li Mingcheng Yang Qi Liu Chen Jia Luyu Yang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. LTD Beijing China State Grid Beijing Fengtai Power Supply Company State Grid Beijing Electric Power Company Beijing China Electrical Engineering College Northeast Electric Power University Jilin City China Technology Management Department Liaoning Electric Power Academy of State Grid Shenyang China

Power system simulation is an important tool to analysis the mechanism and characteristics of high voltage direct current (HVdc) systems. With the increased transmission lines in system, the calculation amount and complexity of simulation increase greatly. The line commutated converter (LCC) is the most widely used converter in HVdc system. The average model of LCC lacks the commutation process and can only be used for steady-state analysis. The switch model is too detail for large system simulation, making the calculation amount too large. Therefore, a modeling method based on micro switch is proposed for LCC in this paper, which reflects the commutation process of converter but has less calculation. Firstly, the basic concept of micro switch is introduced. Secondly, the external characteristics of the active inverter are analyzed. Then, the process of LCC commutation is analyzed to express the characteristics of thyristor unit. Finally, the effectiveness of the micro switch modeling method is verified by simulation. Compared with the switch model, the proposed model can effectively shorten the simulation time, and retain the inverter commutation process, and further simulate the commutation failure scenario in the future.

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Influence of Impregnation state on the Electrical Characteristics of Polypropylene Film for High-voltage capacitors

Influence of Impregnation State on the Electrical Characteri...

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Electrical Engineering and Automation (IFEEA), International Forum on

作者： Zhaoliang Xing Jianjun Zhang Fanqiu Zeng Jian Wang Shaowei Guo Xinghui Zhang Chong Zhang Yong Yu Bo Qi Chunjia Gao State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Grid Tangshan Power Supply Company Tangshan China State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China State Grid Corporation of China Beijing China

Biaxially oriented polypropylene (BOPP) film are generally impregnated in benzyltoluene, which constitute insulating medium of high-voltage capacitors. In order to investigate the electrical properties of impregnated film, this paper builds a test platform for the electrical properties of polypropylene film, and selects key electrical properties such as relative dielectric constant, dielectric loss and breakdown field strength. Testing five thicknesses of film to obtain the laws of the influence of impregnation state on electrical parameters at different temperatures and field strengths. The test result shows that: 1) Dielectric constant of the impregnated film increases from 2.25 to 2.27 at room temperature, the dielectric loss increases from 1.39×10 -4 to 2.7×10 -4 , the average value of dc breakdown field strength of the 13 μm film increases from 619 MV/m to 683 MV/m, the average value of AC breakdown field strength increases from 420 to 460 MV/m. 2) Impregnated film is more affected by the temperature and field strength. The temperature changes from 293K to 353K, the growth rate of dielectric constant increases from 0.5% to 2% after impregnation, and the dielectric loss increases from 1 to 1.5 times. 3) Breakdown field strength increases and then decreases with the thickness, and 13μm film has the highest breakdown field strength.

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Basic Modulation Strategy and Sub-module Voltage Balancing Control for Half-Wave Inverter AC-AC Converter

Basic Modulation Strategy and Sub-module Voltage Balancing C...

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China International Electrical and Energy Conference (CIEEC)

作者： Jiangyuan Li Mingyao Ma Qiang Chen Hanyu Wang Guoliang Zhao Yunfei Xu School of Electrical Engineering and Automation Hefei University of Technology Hefei China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China

Flexible low-frequency transmission technology has competitive advantages in offshore wind power transmission, and the converter is the key equipment of flexible low-frequency transmission technology. According to the requirements of high-voltage and large-capacity scenarios, the topology and working principle of a half-wave variable-frequency AC converter applied to flexible low-frequency transmission are introduced. The topology can realize four-quadrant operation, and the number of sub-modules at the same voltage level is less than that of a modular multi-level matrix converter (M3C). On this basis, the modulation strategy and the sub-module capacitor voltage control are studied, and a sub-module capacitor voltage balance throwing strategy based on the nearest level approximation is proposed. This method can quickly realize the output voltage modulation, effectively control the capacitor voltage unbalance, and reduce the switching loss. Finally, MATLAB/Simulink simulation is used to verify the effectiveness of the proposed throwing strategy in the half-wave low-frequency AC converter.

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Effect of Discharge Amplitude on Electrical Trees Based on Three-Capacitance Model

Effect of Discharge Amplitude on Electrical Trees Based on T...

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Energy Engineering and Power Systems (EEPS), International Conference on

作者： Xiaoning Shi Bo Qiao Zhe Zheng Guohai Lin Yalin Wang Yi Yin State Grid Smart Grid Research Institute Co.Ltd (State Key Laboratory of Advanced Power Transmission Technology) Beijing China Beijing Institute of Smart Energy Beijing China Department of Electrical Engineering Shanghai Jiao Tong University Shanghai China

The phenomenon of electrical trees in dc cable insulation is the main threat to cable operation. The three-capacitance model is one of the common models used to characterize the internal defect discharge of insulation. In this paper, the equivalent circuit is established based on the three-capacitance model of the electrical tree, and the equivalent circuit is analyzed under different conditions of discharge and discharge, and the influencing factors of the apparent discharge quantity change during the electrical tree process are obtained from the perspective of capacitance, and the finite element simulation software is used to calculate the capacitance directly according to the electrode structure. In this paper, the relationship between the partial discharge amplitude and the distance of the pin plate, and the size of the electric tree during the growth of the electric tree under constant pressure is deduced theoretically.

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A Unipolar Coil-Based Multi-Load Inductive Power Transfer System with Decoupling Compensation Design

A Unipolar Coil-Based Multi-Load Inductive Power Transfer Sy...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Yuan Liu Sheng Zhang Ran Zhang Chenwen Cheng Wei Hua State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China School of Electrical Engineering Southeast University Nanjing China

An inductive power transfer(IPT) system that can power multiple loads simultaneously is proposed in this paper. The reaper unit consisting of one receiving coil and one transmitting coil is used. Each repeater unit corresponds to one load. Thus, power can be transmitted from one unit to the next except for powering the local load connected to the repeater unit. Different from the previous publications, the unipolar coil rather than the bipolar coil is adopted in this design. In order to eliminate the magnetic coupling effect between the two coils in the same repeater unit, a full capacitance compensation network is designed. Moreover, constant load currents can be obtained in the proposed multi-load IPT system. Thus, load power can be controlled flexibly without affecting each other. simulation results are provided to validate the effectiveness of the proposed design.

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Technical and economic analysis of different transmission schemes of far-offshore wind power

Technical and economic analysis of different transmission sc...

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Renewable Power Generation and Future Power Systems Conference 2023 (RPG 2023 UK)

作者： ¥. Li T. Cheng Z. Lin C. Gao K. Cui State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co.Ltd.) Beijing People's Republic of China Tsinghua University Beijing People's Republic of China

Far-offshore has a wider sea area, larger wind energy reserves and higher quality wind resources, which is an important direction for the future development of wind power. However, with the increasing capacity and area of far-offshore wind farms, the technical and economic problems of far-offshore wind power transmission are becoming more prominent and there is an urgent need for an in-depth analysis of the cost of various far-offshore wind power transmission schemes. Thus, this paper compiles the typical transmission schemes of modular multilevel converter-based high voltage direct current (MMC-HVdc) transmission, low-frequency AC transmission, and full direct current collection and transmission (Full dc) for far-offshore wind power, and proposes a life-cycle cost assessment method by combining the initial investment cost, operation and maintenance cost. Typical cases are selected to construct the topologies of three transmission schemes, and the life cycle economic indexes and transmission distances of these schemes are analysed and compared. Considering a 25-year life cycle, under the case conditions of 1000MW capacity and 100km transmission distance, the total cost of the MMC-HVdc transmission scheme is the highest, followed by the low-frequency transmission scheme, and the full dc transmission scheme is the lowest, saving about 16% cost compared with the MMC-HVdc transmission scheme.

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