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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Jie Ji Xingshuo Li Shuye Ding Yizhi Chen School of Electrical and Automation Engineering Nanjing Normal University Nanjing China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (数字)9798350386127

ISBN: (纸本)9798350386134

The virtual synchronous generator(VSG) technology offers inertia support but also introduces active power oscillation, which are more serious when in multi-VSG. The previous studies proposed adaptive virtual impedance aimed at suppressing power oscillation in multi-VSG system. However, further research is still needed to thoroughly examine the adaptive virtual impedance coefficient. In this article, how the power oscillation of multi-VSG to be influenced by adaptive virtual impedance coefficient is investigated. Firstly, an analysis is conducted on the active power oscillation mechanism. Subsequently, the variation law of adaptive virtual impedance coefficient affecting active power oscillation is studied. Finally, The effects of different adaptive virtual impedance coefficient values is compared in simulations and experiment.

关键词： Adaptation models Adaptive systems Impedance Frequency synchronization Oscillators Frequency control

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An Feature Data Extraction Method Based on BPCA-SPCA

An Feature Data Extraction Method Based on BPCA-SPCA

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International Conference on Sensing, Diagnostics, Prognostics, and control (SDPC)

作者： Xiangyu Xing Bingrong Yan Yan Su Lingyun Tang College of Civil Aviation Nanjing University of Aeronautics and Astronautics Nanjing China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9798350388855

ISBN: (纸本)9798350388862

With the increasing integration of systems and the rapid development of sensor monitoring technology, the types of monitoring data are more diverse and the number of samples are larger in flight test and operation than before. Due to the large volume and high complexity of monitoring data, the system fault diagnosis and prediction based on monitoring data is inefficient. In order to solve the problem of monitoring data redundancy, a feature extraction algorithm based on BPCA-SPCA is proposed. A system with high failure rate is selected as an example to extract the features of the system monitoring data and realize the verification of data sparseness. The experimental results show that based on BPCA-SPCA the principal components extracted monitoring data can effectively express the features of the original data, and the feature sparse vector can provide effective input information for subsequent fault diagnosis and indirectly improve the efficiency of fault diagnosis.

关键词： Fault diagnosis Redundancy Feature extraction Prediction algorithms Vectors Inference algorithms Sensors Complexity theory Data mining Monitoring

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Design and Application of Load Side Resources Participating in Frequency Modulation Auxiliary Service Market Mechanism in China 7

Design and Application of Load Side Resources Participating ...

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7th Asia Conference on Power and Electrical Engineering, ACPEE 2022

作者： Xu, Fan Su, Yijing Huang, Qihang Chang, Li Lu, Min Yang, Kan State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China State Grid Zhejiang Electric Power Co. Ltd Hangzhou China Economic Research Institute of State Grid Zhejiang Electric Power Co. Ltd Hangzhou China

ISBN: (纸本)9781665418195

At present, the generation units in the frequency modulation market in China has entered the market-oriented operation, while the market-oriented operation of the load side resources has not been started. This paper presents a mechanism design and system application of load side frequency modulation resources participating in frequency modulation auxiliary service market. Firstly, it analyzes the key mechanisms such as declaration, transaction clearing and settlement in the frequency modulation market. Secondly, the operation mechanism of load side regulation resources after participating in frequency modulation market and the operation interaction process with power market are designed. Then, build the clearing model of load side resources participating in frequency modulation auxiliary service market, and jointly clear the power market and frequency modulation market. Taking the provincial power system of frequency modulation auxiliary service market as an example, the relationship between frequency modulation auxiliary service market system and other systems is discussed. Through the market mechanism, the comprehensive optimization operation of the power grid is carried out, and the reserve capacity of the frequency modulation is effectively configured so as to achieve the goal of the lowest operating cost. © 2022 IEEE.

关键词： Frequency modulation

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Distributed Continuation Power Flow for High Penetration New Energy Power grid

Distributed Continuation Power Flow for High Penetration New...

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International Conference on Power and Energy Technology (ICPET)

作者： Zemei Dai Tianhua Chen Yi Tang Jinquan Zhao State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China College of Power & Electrical Engineering Hohai University Nanjing China

ISBN: (数字)9798350375855

ISBN: (纸本)9798350375862

The high penetration of new energy integration into the power grid has highlighted the problem of voltage stability. Continuation Power Flow (CPF) is an important tool for Voltage Stability Analysis (VSA). As the scale of new energy grid integration continues to expand, the method of power equivalent modeling of the aggregated grid in the main transmission network fails due to the neglect of the network structure and new energy models. This paper proposes a distributed voltage stability assessment method for high proportion new energy grids based on Distributed Continuation Power Flow (DCPF). The proposed method decomposes the global grid at the Point of Common Coupling (PCC) into new energy Sub-grids (SGs) and the transmission Main-grid (MG), achieving distributed computation of global grid voltage stability assessment by exchanging state information at the PCC between MG and SGs. Simulation results of the global power system show that the proposed method is effective.

关键词： Couplings Simulation Computational modeling Voltage Power system stability Stability analysis Power grids Distributed computing Thermal stability Load flow

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Capacitance Current Compensation Method for Cable-Overhead Hybrid Transmission Lines 5th

Capacitance Current Compensation Method for Cable-Overhead H...

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International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2020

作者： Yao, Gang Wu, Tonghua Zheng, Yuping Teng, Xianliang Hong, Feng Chen, Guozhou NARI Group Corporation Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9789811597459

At present, the capacitance current compensation technology for transmission line differential protection is based on uniform parameters of entire lines, so it cannot be adapted to cable-overhead hybrid transmission lines. In this paper, a steady-state compensation method based on segment parameters, a time-domain compensation method based on whole line equivalent parameters and a time-domain compensation method based on segment parameters are proposed, which can adapt to different application scenarios, such as hybrid lines with shunt reactance at the ends and junctions. A PSCAD/EMTDC simulation shows that when a hybrid transmission line is short, the time-domain compensation method based on whole line equivalent parameters is simple to implement, and it can effectively compensate the capacitance current of hybrid transmission lines. The time-domain compensation method based on segment parameters can accurately compensate the capacitance current of hybrid transmission lines, taking into account the reliability and sensitivity of differential protection. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Cables

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Analysis of Emergency control Strategy of System Frequency under Large Power Disturbance 7

Analysis of Emergency Control Strategy of System Frequency u...

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7th Asia Conference on Power and Electrical Engineering, ACPEE 2022

作者： Guang, Xu Jiahe, Yang Xuelian, Wu Zhonghui, Wan Hui, Huang Fusuo, Liu Nari Group Corporation/State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control Nanjing China Nari Group Corporation/State Grid Electric Power Research Institute Power Grid Analysis and Consulting Department Nanjing China State Grid Electric Power Research Institute Nanjing China

ISBN: (纸本)9781665418195

When large-power disturbances occur in power grids, the system frequency will shift greatly, and there may be obvious spatial-temporal distribution characteristics. By analyzing the single-machine frequency response characteristics of the system and the frequency difference between the two systems, a system frequency analysis model considering nonlinear factors under large frequency difference is proposed to estimate the maximum offset of the system frequency. It is proposed to reduce the maximum frequency offset and reduce the frequency spatiotemporal distribution characteristics by selecting the coordination method of emergency control at different locations at different times, thus improving the safety and stability of the power grid. © 2022 IEEE.

关键词： Electric power transmission networks

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Design of Online Verification and Optimization Decision System for Emergency Disposal of Power grid Faults

Design of Online Verification and Optimization Decision Syst...

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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Jicheng Du Ming Zhao Changjiang Jiang Xianyu Zha Lingchuan Li Tao Liang Southwest Branch of State Grid Corporation of China Chengdu China NARI Group Corporation(State Grid Electric Power Research Institute) Laboratory of Smart Grid Protection and Control Nanjing China

To effectively reduce the impact of complex and severe faults on the power grid, an online verification and optimization decision-making system for emergency disposal of power grid faults has been designed. Firstly, standardize the modeling of traditional fault emergency disposal and extract the typical structure, constituent elements, and organizational approach of fault emergency disposal. A general description method for fault emergency disposal has been established to achieve structured and modular processing of data. Then, based on the actual fault handling process of the power grid and the priority of handling multiple types of safety and stability issues, the effectiveness of adjustment measures, disposal speed of control measures, control costs, and other constraints are comprehensively considered. Calculate specific control measures, control areas, and control quantities based on the stage of fault disposal. Translate rough handling points into specific control measures and suggestions to achieve online verification and optimization decision-making for fault emergency disposal. Finally, the practicality of the system is verified through an example in the article.

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Decision Support System for Adaptive Restoration control of Transmission System

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Journal of Modern Power Systems and Clean Energy 2021年第4期9卷 870-885页

作者： Ze Li Yusheng Xue Haohao Wang Lili Hao School of Electrical Engineering Southeast UniversityNanjingChina State Grid Electric Power Research Institute(NARI Group Corporation) NanjingChina State Grid Electric Power Research Institute(NARI Group Corporation) NanjingChinaand they are also with State Key Laboratory of Smart Grid Protection and Operation ControlNanjingChina School of Electrical Engineering and Control Science Nanjing Tech UniversityNanjingChina

The power system restoration control has a higher uncertainty level than the preventive control of cascading failures. In order to ensure the feasibility of the decision support system of restoration control, a decision support framework for adaptive restoration control of transmission system is proposed, which can support the coordinated restoration of multiple partitions, coordinated restoration of units and loads, and coordination of multi-partition decision-making process and actual restoration process. The proposed framework is divided into two layers, global coordination layer and partition optimization layer. The upper layer partitions the transmission system according to the power outage scenario, constantly and dynamically adjusts the partitions during the restoration process, and optimizes the time-space decision-making of inter-partition connectivity. For each partition, the lower layer pre-selects restoration targets according to the estimated restoration income, optimizes the corresponding restoration paths, and evaluates the restoration plans according to the expected net income per unit of power consumption. During the restoration process, if the restoration operation such as energizing the outage branch fails, the current restoration plan will be adaptively switched to the sub-optimal one or re-optimized if necessary. The framework includes two operation modes, i.e., the on-line operation mode and training simulation mode, and provides an information interaction interface for collaborative restoration with related distribution systems. The effectiveness and adaptability of the proposed framework is demonstrated by simulations using the modified IEEE 118-bus system.

关键词： Transmission system restoration two-layer decision support framework restoration risk and income restoration uncertainty sand table deduction

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Research on Inter-station 2M Communication protection Method Suitable for Stability control System 16th

Research on Inter-station 2M Communication Protection Method...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Feng, Ke Chen, Xiong Wang, Wang Zhu, Kaiyang Lu, Yan Cai, Yupeng NARI Group Corporation/State Grid Electric Power Research Institute Nanjing210003 China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd Shenyang110004 China State Key Laboratory of Smart Grid Protection and Control Nanjing210003 China

ISBN: (纸本)9789811915314

The communication safety of the safety and stability control system has received more and more attention. This paper analyzes the risks and consequences of the inter-station communication in detail. Based on the special structure of the inter-station communication, a security and stability control system inter-station communication protection method is proposed. This method builds a complete communication management scheme by adding function codes, counting bits and check codes in the message, thereby realizing effective identification and protection of risk points such as communication interruption, information tampering, and playback attacks. The effectiveness and reliability of the method has been proved by the results of experiments. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Cryptography

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Analysis of Ultra-low Frequency Oscillation Stability of Power Systems

Analysis of Ultra-low Frequency Oscillation Stability of Pow...

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International Conference on Power and Energy Technology (ICPET)

作者： Kesu Cai Dongsheng Liu Wenshuo Zhao Xi Hong Yao Yin Xuanqu Fei State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation State Grid Electric Power Research Institute NanJing China School of Electrical Engineering and Electronic Information Xihua University Chengdu China

ISBN: (数字)9798350375855

ISBN: (纸本)9798350375862

The Low-Frequency Oscillation (LFO), Ultra-Low Frequency Oscillation (ULFO) and other oscillation can endanger the safety and stability operation of the power grid. However current relevant standards only have clear provisions on the critical damping ratio of LFO. Based on the risk of ULFO in high proportion hydropower systems, the principle and key influencing factors of ULFO are derived theoretically. According to the characteristics and hazards of ULFO, a method for determining the critical damping ratio of ULFO is explored, and the effectiveness of the method is tested through the actual response trajectory.

关键词： Damping Stability criteria Hydroelectric power generation Power system stability Attenuation Power grids Hazards Trajectory Oscillators Standards

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