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2023 International Conference on power System Technology, powerCon 2023

作者： Wang, Ruimei Cong, Wei Tang, Yi Wang, Anning Zhang, Yongjie Gu, Qianshuo Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9798350300222

As the scale of power system continues to expand, the proportion of distributed generators (DGs) in the smart distribution network has been increasing year by year. To address the problem of power restoration after DGs access, distributed power restoration method based on joint control of photovoltaic unit and pv/battery unit is proposed. Analyzing the control modes of photovoltaic unit and pv/battery unit during distributed power restoration, available capacity and adjustment range are determined based on control principles and operation constraints. Based on this method, the network is gradually converted into Thevenin equivalent circuit, and power restoration calculations are performed while considering the operating characteristics of photovoltaic unit and pv/battery unit. At the same time, power output adjustment is carried out based on voltage and frequency constraints to avoid overvoltage or frequency problems during the power restoration process. Using IEEE 33-node system as an example, then the feasibility of this method is verified. © 2023 IEEE.

关键词： Restoration

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An Adaptive Test Frequency Selection Method for power Cable Defect FDR Detection 1

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Pan, Shaoming Zhang, Yiyi Han, Fangyuan Tang, Jie Feng, Bo Zhang, Lei Zhao, Jian Zhang, Longfei Guangxi Power Grid Equipment Monitoring and Diagnosis Engineering Technology Research Center Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Guangxi Nanning530023 China

ISBN: (数字)9789819714285

ISBN: (纸本)9789819714278

In this paper, an adaptive test frequency selection method for power cable defect FDR detection is proposed to eliminate the competition between test frequency range and frequency sample resolution. The idea of the proposed method is to repeat the FDR test process with sets of dynamically adaptive test frequency ranges, which are obtained according to a rough FDR test result. Thus, with the proposed method, the performance of the defect location can be improved despite the limited hardware resource, namely limited frequency sample points. Both the simulated and experiment result show the proposed method is effective, and can be used to improve the fault diagnosis rate of the power cable defect. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Defects

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Design of Trading Adjustment Mechanism for Energy Storage in Electricity Market Based on Equivalent Net Load Fluctuation 6

Design of Trading Adjustment Mechanism for Energy Storage in...

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6th International Conference on Energy, Electrical and power Engineering, CEEPE 2023

作者： Song, Shihang Zhang, Li Qi, Zhiqiang Wang, Haibo Wang, Yuxi Su, Xinyan Chen, Guanting Wang, Fukun Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9798350348279

As the proportion of renewable energy connected to grid increases continuously, the volatility and uncertainty of its output affect the safe operation of the power system, so it is necessary to adjust the trading mechanism of electricity market. As a high-quality flexible resource, energy storage becomes an important means to deal with the challenge caused by renewable energy. How to improve the mechanism of electricity market to better play the role of energy storage is worthy of in-depth research. This paper proposes a trading adjustment mechanism for energy storage in electricity market based on the fluctuation degree of equivalent net load, and establishes a joint market model of energy market and frequency regulation market including storage power station. The example simulation shows that the trading adjustment mechanism proposed in this paper can effectively enhance the role of energy storage, and has a good effect on improving the fluctuation degree of net load and reducing system operating costs. © 2023 IEEE.

关键词： power markets

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Carbon Emission Calculation and Low Carbon Transition Path Optimization Method for Electric power Industry 25

Carbon Emission Calculation and Low Carbon Transition Path O...

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25th IEEE China Conference on System Simulation Technology and its Application, CCSSTA 2024

作者： Yu, Fanfan Kong, Xiangyu Luo, Shuai Wu, Shunyu Wang, Yubo Gao, Yi Tianjin University of Technology Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin China Tianjin University Key Laboratory of Smart Grid Tianjin China Economic and Technical Research Institute of State Grid Tianjin Electric Power Company Tianjin China

ISBN: (纸本)9798350366600

With economic development, the energy and power industry must balance power supply growth and carbon reduction requirements. To achieve the goal of 'double carbon', the power system needs to be transformed into green and low-carbon, and accurate carbon emission accounting has become a critical support. Due to the significant differences between cities and regions, emission reduction strategies vary. To this end, the article firstly clarifies the carbon emission accounting boundary of power generation enterprises, establishes a carbon emission accounting model for the power industry based on the IPCC inventory method of fuel consumption, and secondly constructs an enterprise low-carbon transition planning model by integrating technological, economic, environmental and other factors, researches and analyzes the path of power generation enterprises to achieve carbon-neutral transition by 2060, and simulates different low-carbon transition scenarios. The results show that achieving carbon neutrality appropriately in advance is beneficial to power generation enterprises to a certain extent, but advancing the process of carbon neutrality too early will lead to soaring costs. In addition,future policies will push forward the scale of installed energy storage, and enterprises should make good use of technical and resource reserves. The power industry needs to formulate appropriate low-carbon transformation strategies according to its reality to ensure that it realizes a win-win situation regarding economic and social benefits while realizing the goal of carbon neutrality. © 2024 IEEE.

关键词： Low emission

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Applicability Analysis of Distance Protection for the Line Integrated with High Proportional Wind Farm 8

Applicability Analysis of Distance Protection for the Line I...

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8th Asia Conference on power and Electrical Engineering, ACPEE 2023

作者： Zhang, Yongwu Yao, Cheng Li, Dayong Huang, Xiaoxiao Xie, Zhongrun He, Jiawei Li, Bin Center State Grid Tianjin Electric Power Company Electric Power Dispatching and Control Tianjin China State Grid Tianjin Electric Power Company Electric Power Research Institute Tianjin China Tianjin University Key Laboratory of Smart Grid of Ministry of Education Tianjin China

ISBN: (纸本)9798350345520

The performance of conventional protections is serious challenged by different fault characteristics of wind turbine, compared to the synchronous generators. The existing studies can only illustrate the applicability of protections to the renewable energy transmission system through qualitative analysis or extensive simulations. This paper proposes a quantitative evaluation method for distance protection applicability in wind power transmission system. Firstly, by deriving the fault current of doubly-fed induction generators, the Fourier algorithm error of the fundamental frequency current under the influence of frequency deviation phenomenon is calculated. Secondly, based on the analysis of the measured impedance error caused by the Fourier algorithm error, the action accuracy of the distance protection under different operation states and fault conditions are obtained. In particular, the protection applicability under different wind power ratios is evaluated for the wind power transmission system bundled with synchronous generators. Finally, a real time simulation model of wind power transmission system is built based on RTDS platform, and extensive simulation cases are carried out to verify the validity of the proposed method. © 2023 IEEE.

关键词： Errors

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Distributed Photovoltaic power Forecasting Method Based on AP Clustering and Transfer Learning

Distributed Photovoltaic Power Forecasting Method Based on A...

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2024 IEEE IAS Industrial and Commercial power System Asia, I and CPS Asia 2024

作者： Yang, Baolong Yang, Ming Bu, Qiangsheng Wang, Chuanqi Zhang, Yuanhe Li, Menglin Luo, Fei Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China Research Institute State Grid Jiangsu Electric Power CO. LTD. Nanjing China

ISBN: (纸本)9798350352290

Highly accurate photovoltaic (PV) power forecast technology can provide a scientific basis for grid planning to ensure safe, economical, and efficient grid operation. The investment cost for a specialized power prediction system for each PV plant is high. Consequently, a distributed PV (DPV) power forecast method based on affinity propagation (AP) clustering and transfer learning is proposed in this paper. First, the dynamic time warping (DTW) algorithm determines the similarity of power curves between DPV plants;on this basis, multiple DPV power plants in the area to be forecasted are divided into station clusters by using AP clustering;and the PV power plants in each station cluster are divided into source and target domain by transfer learning, combined with long-short term memory (LSTM) network, the power forecasting model is established, and enabling transfer of power models from source to target domain. Finally, data from 20 DPV plants in China are used to demonstrate the effectiveness of the approach. Compared to separate modeling, the proposed method reduces the average training time by 58% while maintaining the forecasting accuracy. © 2024 IEEE.

关键词： AP clustering distributed photovoltaic power plant clusters LSTM transfer learning

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Optimal Economic Dispatch Strategy for Microgrids Considering Distributed Energy Storage Aggregation 7

Optimal Economic Dispatch Strategy for Microgrids Considerin...

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7th IEEE Student Conference on Electric Machines and Systems, SCEMS 2024

作者： Kan, Changtao Luo, Xin Liang, Shuang State Grid Jinan Power Supply Company Jinan China State Grid Shandong Electric Power Company Maintenance Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China

ISBN: (纸本)9798350366945

User-side distributed energy storage, as a flexible demand response resource, possesses excellent source-load interaction characteristics and can effectively interact with the power grid. However, currently in China, user-side distributed energy storage resources often face difficulties in directly participating in grid regulation due to factors such as dispersed geographical distribution, small individual installed capacity, and uncertain output time. To address this issue, this paper proposes an optimal economic dispatch strategy for microgrids that considers distributed energy storage aggregation. First, a distributed energy storage aggregator is introduced to manage scattered user-side distributed energy storage resources in a scaled manner, and the scheduling potential of distributed energy storage in each time period is assessed based on consumer psychology theory. Subsequently, a multi-objective optimal dispatch model for microgrids is constructed, which takes into account both economic and environmental aspects. The multi-objective optimization problem is transformed into a single-objective optimization problem using the weighted assignment method, and the CPLEX solver is employed to solve the problem. Finally, the effectiveness and feasibility of the proposed method in this paper are verified through a microgrid test system. © 2024 IEEE.

关键词： consumer psychology theory distributed energy storage resources economic dispatch

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Applicability Analysis and its Modified Method of Positive-Sequence Voltage-Polarization Distance Protection for PMSG Wind Farms Transmission Lines

Applicability Analysis and its Modified Method of Positive-S...

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2023 Tianjin University-IET Electrical and Information Engineering Doctoral Forum, TJU IET 2023

作者： Zhou, Bohao Wen, Tao He, Jiawei Li, Bin Li, Yan Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin300072 China Electric Power Dispatching Control Centre of Guangdong Power Grid Co. Guangzhou510600 China Electric Power Research Institute of China Southern Power Grid Guangzhou510663 China

ISBN: (纸本)9781839539824

The PMSG wind farms will adaptively inject positive-sequence and negative-sequence active and reactive power according to the low-voltage ride-through strategy. Therefore, the phase difference between positive-sequence voltage and current will immediately change, inducing the incorrect operation of the positive-sequence voltage-polarization distance protection. To deal with the above problem, the applicability mechanism of distance protection based on the positive-sequence voltage-polarization is investigated in detail, considering different negative-sequence current strategies. Then, a novel distance protection scheme based on composite sequence current polarization is presented to enhance the reliability of the conventional method. The real-time digital simulator simulation results confirm the applicability analysis and the modified strategy. © The Institution of Engineering & Technology 2023.

关键词： Synchronous generators

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HIGH-FREQUENCY OSCILLATION ANALYSIS OF WIND FARM-SIDE MMC STATION UNDER NO-LOAD CHARGING CONDITION 20

HIGH-FREQUENCY OSCILLATION ANALYSIS OF WIND FARM-SIDE MMC ST...

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20th International Conference on AC and DC power Transmission 2024, ACDC 2024

作者： Yang, Yongqing Ye, Hua Li, Guanqun Yang, Jialun Zhao, Yujing Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University 17923 Jingshi Road Jinan China State Grid Jinan Power Supply Company Jinan China

ISBN: (纸本)9781837242672

Existing research on high-frequency oscillation indicates that the high-frequency oscillation during no-load charging of modular multilevel converter (MMC) station is primarily linked to time delay and the ground capacitance of AC lines. Nevertheless, a high-frequency oscillation around 2000 Hz has been observed in Rudong high voltage direct current project even when the AC lines are not connected. Except time delay, there still exists another key factor of the high-frequency oscillation, i.e., the transformer stray capacitance. This paper delves into the interaction among the dynamics of MMC station and the transformer. And the mechanism of high-frequency oscillation under no-load charging condition is determined. Firstly, the harmonic state space (HSS) model of MMC station considering the effect of stray capacitance is established. By plotting the eigenvalue trajectory, the essentiality of taking into account stray capacitance is elucidated. Subsequently, a simplified model is obtained by neglecting the dynamics of elements with low participation in the oscillation modes. Next, the mechanism of high-frequency oscillation is clarified according to impedance characteristics. Finally, the impact of proportional gain and shear frequency on small signal stability is revealed. The correctness and accuracy are identified by electromagnetic transient simulations. © The Institution of Engineering & Technology 2024.

关键词： Eigenvalues and eigenfunctions

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Stackelberg Game-Based Optimal Dispatch for PEDF Park and power grid Interaction under Multiple Incentive Mechanisms

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Energy Engineering 2024年第10期121卷 3075-3093页

作者： Weidong Chen Yun Zhao Xiaorui Wu Ziwen Cai Min Guo Yuxin Lu Integrated Energy Research Institute Electric Power Research Institute of Guangxi Power Grid Co.Ltd.Nanning530023China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning530023China Institute of Electricity Consumption and Measurement Technology CSG Electric Power Research InstituteGuangzhou510663China

The integration of photovoltaic,energy storage,direct current,and flexible load(PEDF)technologies in building power systems is an importantmeans to address the energy crisis and promote the development of green *** friendly interaction between the PEDF systems and the power grid can promote the utilization of renewable energy and enhance the stability of the power *** this purpose,this work introduces a framework of multiple incentive mechanisms for a PEDF park,a building energy system that implements PEDF *** incentive mechanisms proposed in this paper include both economic and noneconomic aspects,which is the most significant innovation of this *** modeling the relationship between a PEDF park and the power grid into a Stackelberg game,we demonstrate the effectiveness of these incentive measures in promoting the friendly interaction between the two *** this game model,the power grid determines on the prices of electricity trading and incentive subsidy,aiming to maximize its revenue while reducing the peak load of the PEDF *** the other hand,the PEDF park make its dispatch plan according to the prices established by the grid,in order to reduce electricity consumption expense,improve electricity utility,and enhance the penetration rate of renewable *** results show that the proposed incentive mechanisms for the PEDF park can help to optimize energy consumption and promote sustainable energy practices.

关键词： Demand response(DR) incentives photovoltaic energy storage direct current and flexible load(PEDF) reputation Stackelberg game

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