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检索条件"机构=Key Laboratory of Intelligent Dispatching and Control of Power Grid"

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Oscillation Mechanism Analysis of AGC Dynamics Based on Damping Torque Analysis Theory 5

Oscillation Mechanism Analysis of AGC Dynamics Based on Damp...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Sun, Jie Zhou, Tao Li, Huifang Li, Yinjie Tang, Haoran Chen, Liufu Nanjing University of Science and Technology School of Automation Nanjing China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Huzhou Yueqiu Motor Co. Ltd Research and Development Center Huzhou China Yunnan Electric Power Dispatching Control Center China Southern Power Grid Kunming China State Grid Chongqing Electric Power Research Institute Chongqing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Frequency oscillation events take place occasionally in recent years which are strongly related with AGC (automatic generation control) dynamics. In order to investigate the triggering and influence mechanism of AGC oscillations, this paper establishes the multi-area AGC model containing different types of generating units and AGC control types. Then, the oscillation properties and mode identification between AGC and PFR (primary frequency regulation) modes are expounded in detail. On this basis, the DTA (damping torque analysis) theory is studied for frequency stability analysis as it has a clear physical meaning and can reflect oscillation damping characteristics. Then, the model of DTI (damping torque index) is established conduct mode distinguishing and parameter influence analysis. Finally, the effectiveness and feasibility of the proposed method are verified in case studies and some conclusions are drawn from simulation results. © 2022 IEEE.

关键词： Damping

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Equivalence analysis of different sequence impedance modeling methods

Equivalence analysis of different sequence impedance modelin...

引用

China International Electrical and Energy Conference (CIEEC)

作者： Qiao Fang Facai Xing Zhe Jiang Yujing Zhao Cheng Wu Power Grid Technology Center State Grid Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Shandong Electric Power Dispatching and Control Center State Grid Shandong Electric Power Company Jinan China

The sequence impedance has a clear physical meaning and can be directly measured by commercial equipment, so it is widely used for stability analysis in the field of electrical engineering. It can be transformed from dq impedance indirectly or calculated based on Harmonic State Space (HSS) theory directly. This paper analyzes the equivalence of the above two methods. Firstly, the dq impedance model of grid-connected converter is established, and the equivalence of impedance in dq domain and sequence domain is proved by mathematical transformation. Then, modified sequence impedance model of grid-connected converter is established considering the frequency coupling phenomenon. On the other hand, the impedance model can also be obtained from HSS modeling with h order harmonics. Subsequently, the relationship between the modified sequence impedance and HSS impedance can be found. The former is a special case when the latter takes h=2. When considering the coupling effect of higher harmonics, HSS impedance model has higher accuracy. Finally, the accuracy and the equivalence of the above-mentioned two methods are verified by frequency sweep.

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Short Circuit Ratio Index Considering HVDC Transient Characteristics 6

Short Circuit Ratio Index Considering HVDC Transient Charact...

引用

6th Asia Conference on Energy and Electrical Engineering, ACEEE 2023

作者： Li, Fan Yu, Haoyang Liu, Zhongjian Liu, Dong Zhang, Kexin Zhang, Cheng Wang, Mingjie Zhang, Yixing Zhang, De Su, Xiaofan State Grid Economic and Technological Research Institute Co. Ltd. Beijing China Power Dispatching Control Center of Guizhou Power Grid Co. Ltd. Guiyang China Xi'An Jiaotong University The School of Electrical Engineering Xi'an China State Grid Hunan Electric Power Company Limited Economic and Technical Research Institute Hunan Key Laboratory of Energy Internet Supply-Demand and Operation Changsha China

ISBN: (纸本)9798350312690

HVDC systems are extensively utilized due to their numerous advantages. However, these systems encounter significant challenges in terms of transient voltage stability during fault occurrences. Therefore, there is a pressing need for an improved evaluation method to assess the transient voltage level in multi-infeed systems. To address this issue, this paper proposes a novel index, namely the transient multi-infeed short circuit ratio (TMSCR), based on the short circuit ratio (SCR) index, which takes into account the transient voltage characteristics of the system. The paper proceeds as follows: Firstly, it introduces the definition of existing indicators. Secondly, it incorporates transient active or reactive power to derive an index that considers the transient characteristics. Finally, it compares the characteristics of the two short-circuit ratio indexes, and the simulation results validate the accuracy of the proposed indicators. © 2023 IEEE.

关键词： Transients

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Electric Vehicle Support Distribution grid Emergency power Protection Strategy after a Major power Outage

Electric Vehicle Support Distribution Grid Emergency Power P...

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

作者： Jing Xiao Ning Wu Shuai Han Xiaorui Wu Wenlan Gong Electric Power Research Institute of Guangxi Power Grid Co. Ltd Guangxi Power Grid Co. Ltd Beijing China Key Laboratory of Intelligent Control and Maintenance of Power Equipment Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Beijing China

In this paper, we consider the occurrence of extreme disasters (e.g., typhoons, rainstorms, etc.) that cause major power outages and disconnect the distribution network from the main network, which can only rely on distributed power sources and mobile power sources in the distribution network to restore power to the distribution network's lost loads. Among them, extreme disasters cause different degrees of damage to the distribution network lines, resulting in the formation of several different islands in the distribution network. The power and load distribution inside each island varies, and in order to maximize the balance of load restoration, mobile electric vehicles need to be dispatched and moved to important lost loads as important power supply resources to realize the source-load balance inside multiple islands, to enhance the efficiency of resource dispatch and the effect of important load restoration in the distribution network to a greater extent, and to realize the optimal on-demand allocation of electric vehicles within the city after the disaster. Finally, the correctness and feasibility are verified on the IEEE 33-node test system.

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An Orderly Charging Strategy for Multi-Type Charging Stations Considering the Demand for Optimal Operation of Distribution grids

An Orderly Charging Strategy for Multi-Type Charging Station...

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Electrical Engineering and Mechatronics Technology (ICEEMT), IEEE International Conference on

In this paper, we consider that there are different types of charging stations distributed in cities, and according to the charging behavior and driving characteristics of EV users, different charging stations assume different responsibilities and functions to meet the charging needs of different types of EV users. According to the different construction sites, charging stations are mainly divided into two categories: private charging stations and public charging stations. Based on the characteristics of EV charging and the operation characteristics of each type of charging stations, this paper proposes an effective charging station orderly charging planning strategy to realize less charging when the load of distribution network accounts for more and more charging when it accounts for less, so as to realize the reasonable use of multiple types of charging stations, balance the network loss to the greatest extent while ensuring the normal operation of distribution network and meet the effectiveness and sustainability of EV charging. The final calculation verifies the correctness and effectiveness of the proposed strategy.

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Design and Optimization of Totem Pole Bridgeless PFC Based on GaN

Design and Optimization of Totem Pole Bridgeless PFC Based o...

引用

International Conference on Wireless power Transfer, ICWPT 2022

作者： Tang, Mengyang Xue, Pengfei Cheng, Zhangge Yong, Tao Key Laboratory of Smart Grid and Intelligent Control of Nanchong Southwest Petroleum University Nanchong637001 China Taiyuan Power Supply Company State Grid Taiyuan Electric Power Co. Ltd. Taiyuan030012 China Chongqing Sound and Optoelectronics Co. Ltd. Chongqing400000 China

ISBN: (纸本)9789819906307

GaN devices have attracted extensive attention due to their excellent characteristics of high electron mobility. GaN devices can greatly reduce switching loss in hard switching circuits. In order to achieve high efficiency and high power density, GaN devices are applied to totem pole bridgeless PFC topology, the mathematical model of power circuit is established, and the optimal control strategy is proposed based on this model. The change of inductance value caused by different input and output conditions leads to the change of cutoff frequency of the system, which affects the performance of the system. In this paper, a piecewise PI compensation optimization control strategy is proposed. To solve the problem of high total harmonic distortion rate and zero crossing distortion, a duty cycle feedforward control method is introduced. In order to reduce THD, the effect of current loop bandwidth on current harmonics was analyzed qualitatively and optimization strategies were proposed. Finally, the parameters of the control system and the main circuit are designed according to the requirements, and a 1.5kW prototype is developed for experiment, which verifies the correctness of the theoretical analysis and the effectiveness of the optimized control strategy. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Gallium nitride

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Proof-of- Reliability Consensus Mechanism of Blockchain for Remote Operation of Relay Protection

Proof-of- Reliability Consensus Mechanism of Blockchain for ...

引用

China International Electrical and Energy Conference (CIEEC)

作者： Yongjie Zhang Wei Cong Yi Tang Yudun Li Congcong Li Fangfang Shi Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China State Grid Shandong Electric Power Company Jinan China

ISBN: (数字)9798350359558

ISBN: (纸本)9798350359565

Remote operation of protective setting value can enhance the adaptability of protection to real-time operating conditions. As centralized solutions, existing models face information security risks. The decentralized nature of blockchain is advantageous for addressing reliability issues in remote operations. This paper treats the control center and protection relay system sub-stations as nodes in blockchain, proposing a Proof-of- Reliability (PoRel) consensus mechanism based on node reliability. The paper first defines sub-station node types and classification criteria, achieving optimal sub-station node grouping based on 0–1 integer programming. Next, it provides a method for evaluating sub-station node reliability and outlines the consensus mechanism process. Finally, using the IEEE 39-bus system as an example, a blockchain system with 27 sub-station nodes is built using Python software, and the proposed consensus mechanism is simulated and verified. The results indicate that the proposed consensus mechanism improves efficiency, achieves decentralization, and helps ensure reliable relay setting remote operations.

关键词： Integer programming Protective relaying Information security Software Real-time systems Consensus protocol Software reliability

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Electromagnetic Transient Modeling and Real-time Simulation Based on State-space Equations

Electromagnetic Transient Modeling and Real-time Simulation ...

引用

New Energy and power Engineering (ICNEPE), International Conference on

作者： Tianyu Guo Binjiang Hu Hui Luo Liang Tu Yanjun Zhao YuFeng Hu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid China China Southern Power Grid Co. Ltd China

ISBN: (数字)9798331516086

ISBN: (纸本)9798331516093

Due to the different output characteristics of different components of the power system, the simulation results of its output deviate from the actual situation. Therefore, the electromagnetic transient modeling and real-time simulation based on the state space equation are proposed. From the perspective of rectifier, DC transmission line, inverter and control system, the composition of the state space model of the complete power system and the output characteristics of each part in the operation process are analyzed. In the test results, the design method can achieve a stable fit between the real-time simulation results of voltage waveform containing two VSC modules and the actual situation.

关键词： Simulation Systems operation power system dynamics power system stability Aerospace electronics Mathematical models Real-time systems Smart grids Nonlinear dynamical systems Transient analysis

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DC Line Traveling Wave Protection Method Based on Improved Hausdorff Distance Comparison

DC Line Traveling Wave Protection Method Based on Improved H...

引用

China International Electrical and Energy Conference (CIEEC)

作者： Chengyan Diao Wei Cong Xiang Lin Xiaofei Shao Yudun Li Congcong Li Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China State Grid Shandong Electric Power Company Jinan China

ISBN: (数字)9798350359558

ISBN: (纸本)9798350359565

To improve the reliability of conventional protection using fault travelling wave, this paper proposes a line traveling wave protection method based on improved Hausdorff distance comparison. The traveling waves at the two sides of the line have different propagation laws and change characteristics during external fault and internal fault. First, the traveling waveform is processed by time matching and segmentation calculation. Second, splitting the long waveform into short waveforms and averaging the waveforms at both sides of the block processing, thus calculating the average Hausdorff distance. Last, using PSCAD building a bipolar DC transmission system for simulation verification, the results show that the improved method has high reliability.

关键词： Fault diagnosis power transmission lines Simulation Voltage Capacitance Reliability engineering Reflection

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Monitoring and prediction of thermal failure of high-voltage switchgear insulation materials by studying the thermodynamic properties of FR-4 epoxy resin and the characteristic gas of thermal decomposition 2

Monitoring and prediction of thermal failure of high-voltage...

引用

2nd International Conference on Electronics, Electrical and Information Engineering, ICEEIE 2022

作者： Hu, Mengzhu Tang, Bin Liang, Qinqin Luo, Zongchang Luo, Chuansheng Wang, Jialin Zhang, Longfei Zhu, Liping Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. China Nanning Power Supply Bureau of Guangxi Power Grid Co. Ltd. China Guangxi Power Grid Co. Ltd. China

FR-4 epoxy resin is a common material used as internal parts in high voltage switchgear. In this paper, we adopted the accelerated thermal aging method to explore the thermal aging behavior of FR-4 epoxy resin, simulating the practical application of this material in high voltage switch. The effects of thermal aging on the thermodynamic properties and thermal decomposition characteristic gases of FR-4 epoxy resin were characterized by FT-IR, DSC, TG and GC-MS analyses. The experiment results showed that thermal aging could destroy the internal crystal structure of FR-4 epoxy resin, which could lead to this material easier to be decomposed after heating. We also detected that the thermal decomposition rate of FR-4 epoxy resin aging was greatly accelerated compared with the materials that had not been aged. In addition, unaged FR-4 epoxy resin could release 9 main volatile gases under 120°C, and irreversible defects or structural damages occurred in the materials along with the volatilization of small organic molecules. Furthermore, after continuous thermal aging at 120 °C for 672 h, the molecules of FR-4 epoxy resin were more cracked and volatilized, we observed a more obvious phenomenon of thermal decomposition in this materials. In total, we compared the types of thermal decomposition gases and the decomposion mechanism of aged and unaged FR-4 epoxy resin. In application, our results can provide reference for condition monitoring and fault prediction for this material in high voltage switchgear in the future. © Published under licence by IOP Publishing Ltd.

关键词： Epoxy resins

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