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Ultra-short-term forecasting method of demand-side resource response transaction scale based on GAT-Transformer

Ultra-short-term forecasting method of demand-side resource ...

引用

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

作者： Haohui Zeng Ziteng Liu Jianli Zhao Zhenlan Dou Cheng Li Ruping Shao College of Electrical Engineering and Control Science Nanjing Tech University Nanjing China Shanghai Key Laboratory of Smart Grid Demand Response State Grid Shanghai Electric Power Company Shanghai China State Grid Shanghai Municipal Electric Power Company State Grid Shanghai Electric Power Company Shanghai China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With the transformation from "source-load interaction" to "source-load interaction," demand-side resources can improve the flexibility of power grid and promote the efficient use of clean energy by participating in power grid regulation. Due to the wide variety and different characteristics of demand side resources, the management of demand side is becoming more and more important. The accuracy of demand side resource transaction scale measurement is one of the keys to improve the resilience of power grid. In order to solve this problem, this study proposes an ultra-short-term forecasting method of demand-side resource response transaction scale based on GAT-Transformer. Firstly, the demand side resource transaction data and meteorological data are input into the GAT network, and the graph feature representation is extracted. Secondly, the feature representation is enhanced by combining category labeling and location embedding, and the dropout operation is applied to reduce the risk of overfitting. Finally, the Transformer module is used to further process the enhanced features, and the Multi-Layer Perceptron ( MLP ) is used to classify and output the final results. The experimental results show that compared with other prediction methods, the prediction results of this method are at least 0.232 lower in RMSE, 0.247 lower in MAE and 5.702 lower in MAPE.

关键词： Accuracy Power measurement System integration Predictive models Feature extraction Transformers Power grids Regulation Forecasting Resilience

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Research on Secure Data Circulation and Sharing protection Technology Framework for Power Monitoring System

Research on Secure Data Circulation and Sharing Protection T...

引用

International Conference on Networking and Network Applications (NaNA)

作者： Weicong Huang Jieying Zhou Minghui Jin Zheng Han Sijia Wei State Grid Laboratory of Power cyber-Security Protection and Monitoring Technology State Grid Smart Grid Research Institute Co. LTD. Nanjing China National Power Dispatching and Control Center State Grid Corporation of China Beijing China State Grid Shanghai Municipal Electric Power Company Shanghai China

With the increasing frequency of data circulation and sharing in power monitoring systems, traditional network-centric protection strategies are insufficient to resist the growing risk of data leakage. This article analyzes the security risks in existing typical data circulation and sharing scenarios based on the demand for data security sharing in power monitoring systems. A data security protection technology framework covering the source layer, interaction layer, and terminal layer has been proposed from the perspectives of basic protection capabilities and key protection technologies, as well as an evaluation method for the protection technology capabilities of data circulation and sharing. This provides a reference idea for effectively enhancing the data circulation and sharing protection capabilities of power monitoring systems.

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Analysis of action mechanism of positive sequence fault component directional element considering energy storage access

Analysis of action mechanism of positive sequence fault comp...

引用

IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Feng Xue Jiawei He Bin Li Rui Mu Cheng Yao Yongwu Zhang Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Electric Power Research Institute State Grid Tianjin Electric Power Company Tianjin China Electric Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China

ISBN: (数字)9798350373479

ISBN: (纸本)9798350373486

When the energy storage system is connected to the AC distribution network, the action characteristics of the fault component direction element are different from other new energy systems due to its special control strategies and working modes. Under the same fault condition, the different charging and discharging modes of the energy storage system will lead to different operating characteristics of the positive sequence fault component direction element. Based on the control strategies and working modes of the energy storage system, this paper focuses on the phasor characteristics of the positive sequence voltage and current before and after the symmetrical fault of the AC side line connected to the energy storage system, and analyzes the action mechanism of the positive sequence fault component direction element. Finally, the correctness of the theoretical analysis is verified by PSCAD simulation.

关键词： Lead acid batteries Electrical engineering Reactive power Simulation Asia Distribution networks Fault location

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Reliability Evaluation of Electronic Cabin Smoke Detector Based on FMEA and Arrhenius Mode 12

Reliability Evaluation of Electronic Cabin Smoke Detector Ba...

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12th IEEE Global Reliability and Prognostics and Health Management, PHM-Nanjing 2021

作者： Sul, Yan Liang, Xuerui Wen, Tan Civil Aviation College Nanjing University Of Aeronautics And Astronautics China State Key Laboratory Of Smart Grid Protection And Control Nanjing China Civil Aviation College Nanjing University Of Aeronautics And Astronautics Nanjing China

ISBN: (纸本)9781665401302

The high reliability of smoke detectors in the electronic cabin of passenger aircraft is of great significance for reducing the false alarm rate of smoke detection and ensuring the safety of passenger aircraft and passengers. In order to analyze and evaluate the reliability of newly developed smoke detectors, a set of reliability evaluation methods for electronic cabin smoke detectors based on FMEA (failure mode and impact analysis) and Arrhenius models are presented. First of all, based on the principle of the system, the FMEA method is used to analyze and determine the potential failure location, potential failure mode and failure reason of the smoke detector. Then, the RPN (Risk Coefficient) evaluation method based on the expert scoring method determines the priority ranking of failure risks, establishes risk evaluation indicators, conducts risk evaluation on failure modes, and determines high-risk stresses. Finally, for the high-risk stress, a life prediction of the smoke detector in the electronic cabin based on the Arrhenius model is established. The feasibility and effectiveness of the above reliability evaluation method are verified and analyzed by taking a smoke detector in the electronic cabin of a certain type of passenger aircraft as an example. © 2021 IEEE.

关键词： Risk assessment

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Study on the corresponding relationship between critical points of P-V Curve and V-Q curve of simple thevenin equivalent system 1

Study on the corresponding relationship between critical poi...

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1st IEEE China International Youth Conference on Electrical Engineering, CIYCEE 2020

作者： Li, Xuan Li, Zhaowei Guan, Linlin Wu, Xuelian Mei, Yan Li, Jun State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Operation Control Nanjing211106 China

ISBN: (纸本)9781728196596

With the further increase in power demand for highly concentrated load centers and the gradual formation of a power system with a high proportion of new energy sources, China will face severe risk of voltage instability. In this paper, firstly, the load bus voltage equation of simple Thevenin equivalent system is derived, and then the P-V and V-Q curves are obtained respectively. Secondly, the mutual restriction relationship between active and reactive power of load is discussed when there is a real value solution to the voltage. Finally, the relationship between the voltage of critical points of the P-V curves and the reactive power of the load, and the relationship between the voltage of critical points of the V-Q curves and the active power of the load are deduced respectively. The relationship of one-to-one correspondence between critical points of P-V curves and critical points of V-Q curves is proved according to the mutual restriction between active power and reactive power of load and monotonicity of critical voltage and load power function. © 2020 IEEE.

关键词： Reactive power

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Transient Performance Optimization of grid Forming Converter

Transient Performance Optimization of Grid Forming Converter

引用

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

作者： Sichao Wang Chunpeng Li Yuexi Yang Congda Han Hanbin Zhang Junwei Huang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Fujian Key Laboratory of Protection and Operation Contorl for Smart Grid State Grid Fujian Electric Power Research Institute Fuzhou China

With the increased penetration of renewable energy sources (RES), the power system is emerging a lower inertial characteristic. This can lead to a higher rate-of-change of frequency (RoCoF) and the voltage instability issue during grid disturbance conditions, thus threatening the security of the power grid. Accordingly, researchers have recently proposed a novel grid-forming (GFM) control strategy. Compared to the traditional grid-following (GFL) control method, the GFM control can emulate the dynamic behaviors of the synchronous generator (SG), inherently providing inertial support to stabilize the grid frequency and transient AC voltage. However, it may lead to abnormal transient stress, such as over/under DC voltage and AC overcurrent, raising the risk of unexpected tripping. The paper will present the operating principles of multiple types of GFM and GFL control strategies, and evaluate their dynamic performance during the grid voltage variation events. To address the issue of transient stress, the paper will propose a novel control strategy for suppressing the over/under DC voltage and AC overcurrent so that prevented disconnection of the GFM converters. The proposed method is validated with an example of PV generation scenario, and the effectiveness in improving the dynamic performance has been demonstrated by studying the frequency variation cases.

关键词： Power system dynamics Power system stability Valves Frequency conversion Stability analysis Voltage control Transient analysis

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Transient Voltage Support Strategy for grid-Forming PV-ESS Based on Dynamic Reactive Power Compensation

Transient Voltage Support Strategy for Grid-Forming PV-ESS B...

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Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Zhou Ding Xiaoling Su Zhengkui Zhao Hui Chen Key Laboratory of Smart operation of new energy power system Ministry of Education Qinghai University Xining China Power Dispatching Control Center State Grid Qinghai Electric Power Company Xining China

ISBN: (数字)9798331504076

ISBN: (纸本)9798331504083

grid-following control no longer applicable to power system because of the high-proportion level of renewable energy generation, which brings challenges like insufficient reactive-power support, weak voltage-recovery capability during faults. Although the grid-forming photovoltaic integrated energy storage system (PV-ESS) has active support ability, it faces power-angle instability during its transient process. Therefore, this paper study the coupling influence mechanism of reactive-power control loop on transient stability of grid-forming control during grid faults. Reactive power-voltage $\boldsymbol{(Q_{\mathrm{e}}-E)}$ droop control changes $\boldsymbol{P_{\mathrm{e}}-\delta}$ curve, increase system instability in accelerating area and decrease in decelerating area. Then a transient voltage-support strategy based on dynamic reactive-power compensation is proposed. It reconstructs stable-operating range by dynamically adjusting the reactive-power compensation amount. A simulation model is developed based on Matlab/Simulink platform. Simulation results verify the proposed control strategy.

关键词： Reactive power Transient response Renewable energy sources Simulation Power system dynamics Power system stability Stability analysis Transient analysis Voltage control grid forming

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Voltage control for Black-Start Based on Energy Storage Station and Wind Farm

Voltage Control for Black-Start Based on Energy Storage Stat...

引用

Intelligent Power and Systems (ICIPS), International Conference on

作者： Yuanzhen Zhu Xinyu Wei Tianshu Li Yiheng Chen Ning Zhou Qiao Fang Kang Zhao Runjia Sun Shandong Smart Grid Technology Innovation Center State Grid Shandong Electric Power Company Electric Power Science Research Institute Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Jinan China

ISBN: (数字)9798331532765

ISBN: (纸本)9798331532772

Energy storage station (ESS) and wind farm (WF) have the potential to serve as a black-start sources to accelerate the power system restoration after blackout. However, the voltage security problem when start the auxiliary machines of power plants limit their reliability as black-start sources. A voltage control method is proposed for ESS and WF combined black-start sources to improve the voltage security during black-start. Firstly, the black-start process based on grid-forming ESS and WF is presented, and the voltage control framework is established. Then, a predictive control method considering the impact of active power on voltage variations is proposed, in which different optimization modes are established to obtain the active and reactive control sequences for WF and ESS. Finally, black-start simulation with Matlab/Simulink demonstrate the proposed method can improve the voltage security level when starting auxiliary machines of power plants.

关键词： Simulation Wind farms Regulation Security Reliability Voltage control Power generation Predictive control grid forming Energy storage

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Analysis on Differential protection Sensitivity of Traction Transformers Based on Different Conversion Modes

Analysis on Differential Protection Sensitivity of Traction ...

引用

2020 International Symposium on New Energy and Electrical Technology, ISNEET 2020

作者： Xiaobao, Liu Yuping, Zheng Feng, Long Tonghua, Wu Shuyan, Pan Lin, An State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing Jiangsu211106 China

With the rapid development of high-speed rail technology in China, the traction transformers of various types have been used more and more extensively. The differential protection of traction transformers has different differential conversion modes [1-2] which are different in their sensitivities. In this paper, taking the YNV traction transformer as an example, by comparing the sensitivities of two different common differential conversion modes and through analysis, it shows that the sensitivities of differential protection are slightly different. The sensitivities of differential protections based on different principles depend on the retention degree of differential current to the positive sequence, negative sequence and zero sequence components in the internal fault current. The sensitivity of phase current minus zero sequence differential is the highest when single-phase grounded, which completely retains all the sequence components in the internal fault current. The sensitivity of interphase differential protection is the highest when interphase fault occurs. The widely used phase current differential and phase current minus zero sequence differential do not reflect the zero-sequence component of internal fault current, which provides the basis for field fault analysis and setting. © Published under licence by IOP Publishing Ltd.

关键词： Electric grounding

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Capacitor Voltage Balancing Strategy Based on Zero-Sequence Voltage Injection for Half-Wave Commutated Modular Multilevel Converter

Capacitor Voltage Balancing Strategy Based on Zero-Sequence ...

引用

International Conference on Power Electronics and Motion control (IPEMC)

作者： Nan Fu Bao Liu Yunfei Xu Sitong Zhu Kui Wang Yongdong Li Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Changping Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Half-wave commutated modular multilevel converter (HWC-MMC) is suitable for high-voltage large-capacity AC-AC conversion, and an appropriate capacitor voltage balancing strategy is essential. This paper analyzes the condition of capacitor voltage balancing and proposes a capacitor voltage balancing strategy based on optimal zero-sequence voltage injection using the model predictive control. Finally, the simulation is carried out to verify the proposed strategy.

关键词： Multilevel converters Voltage fluctuations Capacitors High-voltage techniques Power system harmonics Power electronics Steady-state

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