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4th Energy Conversion and Economics Annual Forum (ECE Forum 2024)

作者： Xu Xie Wenjia Chu Yinxiao Li Yanbin Li Xue Liu Fan Shi Hongye Guo North China Branch of State Grid Corporation of China Beijing People's Republic of China State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing People's Republic of China

ISBN: (数字)9781837242924

With the rapid development of renewable energy in large-scale energy bases, the uncertainty and volatility of renewable energy power pose significant challenges to power transmission. To address this, the paper proposes a complementary benefit mechanism that incentivizes thermal units and co-located energy storage systems (ESSs) to provide flexible regulation services. When renewable energy output is excessive, renewable energy units can purchase deep peak regulation services from thermal power units or sell the excess electricity to other co-located ESSs. With the goal of maximizing social welfare, a clearing model for the complementary benefit mechanism is established to achieve optimal benefits for all stakeholders involved. The results of the case study demonstrate that the proposed mechanism effectively promotes renewable energy accommodation and increases the profits of all stakeholders. The mechanism fosters market competition and encourages participants to bid based on their true costs, contributing to the healthy development of the complementary benefit mechanism.

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Synchronization Stability of Grid-Tied VSC With control Limiters: Models, Solutions, and Boundaries

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IEEE Transactions on Energy Conversion 2024年

作者： Wu, Tianhao Jiang, Qirong Liu, Feng Huang, Meng Xie, Xiaorong State Grid Corporation of China National Power Dispatch and Control Center Beijing100031 China Tsinghua University State Key Laboratory of Power System Department of Electrical Engineering Beijing100084 China Wuhan University School of Electrical Engineering and Automation Wuhan430072 China

Existing studies on large-signal synchronization stability of the grid-following voltage-source converters (VSCs) have been focused on the phase-locked loop (PLL). Saturation nonlinearities introduced by current or voltage limiters, which can emerge during large disturbances, could greatly complicate the instability mechanism of PLL-synchronized converters. However, limited attention has been paid to such saturation-induced instability issues in prior work. This paper investigates the large-signal synchronization stability of grid-tied VSCs with full consideration to two typical kinds of saturation nonlinearities in the VSC's control system: the current hard limiter and the voltage circular limiter. The conditions under which the VSC may enter a saturated state are revealed. The impacts of hard and circular limiters on the system transient dynamics are analyzed separately. A unified differential equation (UDE) model that combines both kinds of limiters is proposed for quantitative analysis of synchronization stability. Subsequently, the averaging-theory-based analysis approximately solves the UDE model and provides the analytical large-signal stability boundaries of the system. The impacts of various factors, including operating conditions, PLL parameters, limiter thresholds, and active/reactive current control strategies, on the synchronization stability are investigated based on the proposed model. The effectiveness of theoretical analyses is validated via time-domain simulation and control hardware-in-the-loop tests. © 1986-2012 IEEE.

关键词： Phase locked loops

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Detection of False Data Injection Attacks in Smart Grids via Nonlinear Interval Observer: A Review

Detection of False Data Injection Attacks in Smart Grids via...

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International Conference on Energy Conservation and Efficiency (ICECE)

作者： Kashif Ali Zuraiz Rana Rashid Haseeb Ashfaq Niaz Muhammad Zahid Dingkang Liang Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China Department of Electrical Engineering U.E. T. Lahore Lahore Pakistan

Identify individual False Data Injection (FDI) attacks in different intelligent networks. FDI attacks can circumvent conventional means of identifying corrupt data and interfere with the health assessment process. The rise of FDI attacks has introduced significant security vulnerabilities to smart grids. To address these important issues, A technique for detecting FDI attacks in various SG systems have been proposed. The interval observer is designed to precisely predict the Temporal condition of the internal physical structure based on development of the physical properties of the smart grid system. A detection criterion has been proposed to activate an alert if the remaining interval fails to include zero, considering the inner state boundary and the outer interference boundary. A sensor isolation algorithm based on a logical matrix for assessing attack characteristics is additionally proposed for introducing FDI attacks into sub-areas. Finally, we hope this article complements a series of recent review articles and fosters further research in this rapidly evolving area. And discussed our opinions on remaining challenges and future research directions in this area.

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MCMC Wind power Sequence Modeling Method Considering Climbing Direction

MCMC Wind Power Sequence Modeling Method Considering Climbin...

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power Science and Technology (ICPST), IEEE International Conference on

作者： Ling Hao Fei Xu Lei Chen Qun Chen Yong Min Yi Gu Yiming Chang Department of Electrical Engineering State Key Laboratory of Power System Operation and Control University Beijing China Department of Engineering Mechanics Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University Beijing China State Grid Liaoning Electric Power Co. Ltd Liaoning China

Since the traditional Markov Chain Monte Carlo (MCMC) method has the problem that the wind power is stuck in a certain state and it is difficult to jump, this paper proposes an improved MCMC method considering the climbing direction, first dividing the state by the size of the output and the climbing direction, and then determining the duration of each state by changing the state, and then sampling and generating the corresponding number of output samples according to the duration of each state, and sorting these samples according to the climbing direction, and the sorted output is the output timing of the state. This method was used to generate wind power sequences from a wind farm in the Northeast China Sea, and the characteristics of a wind power sequence were compared and analyzed with the original wind power sequence, and the results were better than the wind power sequences generated by the traditional MCMC method.

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A Stability-Oriented Expansion Planning of Active Distribution Networks with High Pv Penetration by Coordinating Multiple Flexible Resources

SSRN

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SSRN 2023年

作者： Li, Jianjing Sun, Kai Sun, Bo Li, Fan School of Control Science and Engineering Shandong University Jingshi Road 17923 Jinan250061 China State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China

Integrating high-penetration photovoltaics (PVs) into the active distribution network (ADN) often causes overvoltage issues. One significant responsibility of the distribution network operator (DNO) is to design and expand the network to accommodate high-penetration PV integration with stability and low cost. This paper innovatively coordinates the deployment of electric vehicle charging stations (EVCSs) with the rigid requirements and multiple active management resources, and proposes a bi-level ADN expansion planning (ADNEP) method. Firstly, aiming to address uncertainties in generation and load demand, this paper develops an uncertainty description method based on Wasserstein Generative Adversarial Network with Gradient Penalty (WGAN-GP) and K-means clustering. Next in bi-level optimization process, the investment cost is minimized by optimizing the siting and sizing of PV, EVCSs, energy storage systems, on-load tap changers, and static var compensators in upper level. In lower level, multi-objective stochastic model that selects network loss, PV abandonment and voltage deviation as multiple optimization objectives is established to optimize the operation output. The established multi-objective ADNEP model is solved by TOPSIS-adaptive particle swarm optimization algorithm. Finally, this bi-level expansion is tested in actual rural 41-bus and urban 40-bus distribution networks, with average investment cost and annual operating costs reduced by 5.54% and 3.18%, respectively. © 2023, The Authors. All rights reserved.

关键词： K-means clustering

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A Two-layer Adaptive control Strategy for Photovoltaic power in Different Scenarios 3

A Two-layer Adaptive Control Strategy for Photovoltaic Power...

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3rd International Conference on Energy engineering and power systems, EEPS 2023

作者： Wan, Yanghui Yan, Jiahao Chu, Tianfeng Li, Yaping Yuan, Kun Zhang, Kaifeng Southeast University Key Laboratory of Measurement and Control of Complex System of Engineering Ministry of Education Nanjing China Power Automation Department Nanjing China State Grid Liaoning Electric Power Co. Ltd. Electric Power Research Institute Shenyang China

ISBN: (纸本)9798350313857

Currently, control strategies for distributed photovoltaic (PV) power generation are relatively single and rigid, and cannot flexibly adapt to the diverse demands of power grids in different scenarios. Firstly, this paper analyzes the adaptive relationship between different dispatching demands, the regulation ability of distributed PV, and the characteristics of the local voltage. Secondly, for different scenarios, the coordinated controller determines the reference values of active power and reactive power given to the inverter. Thus, distributed PV power control modes which can adapt to different scenarios have been established. Then, these control modes can be classified into single control modes and compound control modes according to the complexity of scenario demands. On this basis, a specific two-layer adaptive control strategy and process of distributed PV power generation in a low-voltage distribution network are further proposed, which takes into account both external demands of the distribution network and the regulation ability of distributed PV. Finally, a case study is given to verify the rationality and effectiveness of the two-layer adaptive scenarios control strategy. This strategy can effectively improve the comprehensive support ability of distributed PV power generation towards the power grid in multiple scenarios, and improve the stable operation level of the regional power grid. © 2023 IEEE.

关键词： Reactive power

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Optimization Strategy for Virtual Energy Storage of Electric Vehicles to Participate in Multiple Ancillary Services

Optimization Strategy for Virtual Energy Storage of Electric...

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Clean Energy and Electric power engineering (ICCEPE), International Conference on

作者： Qi Guo Haohan Gu Yifei Zhao Liang Tu Qifang Chen Haiqing Cai Wei Chen Zhihao Chen Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China School of Electrical Engineering Beijing Jiaotong University Beijing China

ISBN: (数字)9798350390315

ISBN: (纸本)9798350390322

When EVs participate in multiple ancillary services of the power grid, due to the lack of a unified management scheduling plan, various ancillary service demands compete for limited energy storage resources. This would lead to conflicts when the virtual energy storage of EV participates in the regulation of multiple ancillary services. In order to solve the above problems, a reasonable and feasible optimization strategy for virtual energy storage of EVs is formulated to alleviate the conflict problems of ancillary services. The validity of the proposed method is verified by simulation cases.

关键词： Economics Green energy Electric vehicles Linear programming Regulation power grids Optimization Frequency control Energy storage

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Space Charge Transport of Al2O3/Silicone Rubber Composites under Thermal Aging

Space Charge Transport of Al2O3/Silicone Rubber Composites u...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Zhang, Yunxiao Yan, Chenning Wu, Kai Zhou, Yuanxiang Zhang, Tianfeng College of Electrical Engineering and Automation Fuzhou University Fujian Fuzhou China Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing China School of Electrical Engineering Xinjiang University The Wind Solar Storage Division State Key Laboratory of Power System and Generation Equipment Urumqi China Electric Power Research Institute Anhui Electric Power Company of State Grid Hefei China

ISBN: (纸本)9781665407502

Silicone rubber (SIR) has been widely used in the insulation of cable accessories due to its excellent performance. In this paper, pure SIR and nano Al2O3/SIR composites are thermally aged for 0-80 days at 200°C. The effects of long-term thermal aging on the space charge transport are analyzed. The results show that with the increase of thermal aging time, the accumulation of heteropolar charge of pure SIR and nano Al2O3/SIR composites gradually decreases and changes to the accumulation of homopolar charge. Compared with pure SIR, the space charge accumulation of Al2O3/SIR composites decreases significantly and changes little with the increase of thermal aging time. It is believed that when doped nano Al2O3 in SIR, the increase of carrier mobility and the introduction of metal oxides reacting with fallen free radicals to form stable compounds both lead to less space charge accumulation of Al2O3/SIR composites. © 2022 IEEE.

关键词： Aluminum oxide

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High-efficiency Diagnosis of DC-link Capacitors in Grid-connected PV system with Parallel DC Modules 48

High-efficiency Diagnosis of DC-link Capacitors in Grid-conn...

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48th Annual Conference of the IEEE Industrial Electronics Society, IECON 2022

作者： Lu, Geye Zheng, Dayong Zhang, Pinjia Zheng, Tao Tsinghua University Department of Electrical Engineering Beijing China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source Beijing China

ISBN: (数字)9781665480253

ISBN: (纸本)9781665480253

The grid-connected photovoltaic (PV) power generation system which has multiple parallel DC modules is popularly applied in industry. In each DC-DC converter, the DC-link capacitor is the weak component which is subject to electrical property degradation. Most existing methods hardly achieve on-line capacitor diagnosis in economy and efficiency manners, considering the cost of measurement units and the effect of PV cables. In this paper, a high-efficiency diagnosis method for DC-link capacitors is proposed using two readily-available currents. The novelty lies in the linear relationship between the proposed current gain and the degradation degree at a certain characteristic frequency. The DC-link capacitor in each parallel branch can be diagnosed separately. Based on the built simulation model, the performance of the proposed DC-link capacitor diagnosis method is clarified with effectiveness and the effects of inherent harmonics and control strategies are investigated. The proposed current gain is not affected by voltage and current harmonics, as well as the varying load under the specified inverter control strategy. However, the proposed current gain is dependent on temperature and irradiance since the duty cycle of DC module is dynamically adjusted in the operation. © 2022 IEEE.

关键词： DC-DC converters

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The Correlation Mechanism that Micro-Structure Parameters of ZnO Varistor to the Macroscopic electrical Characteristics 4

The Correlation Mechanism that Micro-Structure Parameters of...

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4th IEEE International Conference on electrical Materials and power Equipment, ICEMPE 2023

作者： Meng, Pengfei Guo, Jingke Zhao, Long Lu, Wenhao Liu, Zheng Li, Shan Zhou, Kai Hu, Jun Sichuan University College of Electrical Engineering Chengdu China State Grid Corporatio of China State Grid Linyi Power Supply Company Linyi China Extra High Voltage Power Transmission Company of Csg High Voltage Technology Department Guangzhou China Northwest Institute of Nuclear Technology State Key Laboratory of Intense Pulsed Radiatio Simulation and Effect Xi'an China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Beijing China

ISBN: (纸本)9798350334678

As the core part of metal oxide arresters, ZnO varistor plays an important part in suppressing the overvoltage of power systems. With the development of UHV technology, the residual voltage and energy capacity of ZnO varistors have put forward higher requirements. The research is carried out from the perspective of material calculation, studied the correlation mechanism between micro-structure parameters and various macroscopic electrical characteristics of ZnO varistor based on Voronoi network. And the microstructure parameters such as grain size and size inhomogeneity were calculated and studied. The study simplified the optimization problem with multiple variates and objectives, into the one with two categories of variates and two categories of objectives. And then proposed specific strategies. The research provides important theoretical basis for improving the performance of ZnO varistors, and witch is of great significance for the design and manufacture of high-performance lightning arresters. © 2023 IEEE.

关键词： Microstructure

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