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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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Photovoltaic generation Scenario Analysis Considering Irradiation Uncertainty and Output Derating Probability 5

Photovoltaic Generation Scenario Analysis Considering Irradi...

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5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Wan, Yuxiang Cheng, Lin Xu, Helin Qi, Ning Tian, Liting State Key Laboratory of Power System and Generation Equipment Deptartment of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781665434256

The performance of PV system is influenced by both uncertain external factors and component reliability. This paper proposes a scenario generation approach of PV system combing the irradiation forecasting and system derating probability. Firstly, the catboost machine learning method is adopted to achieve the irradiation forecasting of different weather conditions as well as the predicting error distribution. Meanwhile, the PV system is divided into several levels according to the failure impact degree. The reliability states are sampled by using the sequential Monte Carlo simulation to analyze the distribution of PV derating output state. Finally, combining the error distribution and derating probability, the typical PV output scenario is generated. The results show that the typical photovoltaic scene obtained by the proposed algorithm can cover a larger fluctuation range and effectively eliminate the negative effects caused by prediction errors, providing a more reasonable basis for scheduling. © 2021 IEEE

关键词： Irradiation

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A disturbance localization method for power system based on group sparse representation of compressed sensing 2

A disturbance localization method for power system based on ...

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2nd IEEE International Conference on Electrical Engineering, Big Data and Algorithms, EEBDA 2023

作者： Wang, Zeyi Jiao, Mingxi Wang, Daliang Liu, Minxu Jiang, Minglei Wang, He Li, Shiqiang State Grid Jilin Electric Power Co. Ltd. Changchun Power Supply Company Changchun China Institute of State Grid Jilin Electric Power Co. Ltd. Economic and Technical Research Changchun China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin China

ISBN: (纸本)9781665462532

This paper proposes a new disturbance localization method for power system based on group sparse representation of compressed sensing. Based on the analysis of disturbance characteristics of power system, the sparse dictionary of compressed sensing group is constructed by the admittance matrix, impedance matrix, and power variation matrix. In addition, the traditional generalized orthogonal matching pursuit reconstruction algorithm is improved to obtain the group sparse coefficients corresponding to the above dictionaries for compressive sensing sparse reconstruction, and the corresponding weights of each class in the group sparse dictionary are determined based on the entropy weight method to realize the accurate location of power system disturbances. In this paper, the IEEE 39 node power systems are built on the PSCAD/EMTDC simulation platform for experimental verification, and three common disturbances of cutting generator capacity, cutting load capacity and single-phase grounding short circuit are analyzed respectively. The simulation results show that the proposed method can achieve the accurate location of common disturbances in power systems with limited measurement device configurations, and has the advantages of less computation and strong robustness to noise. © 2023 IEEE.

关键词： Entropy

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Dynamic Security Evaluation Method for power systems Considering Cascading Failures 7

Dynamic Security Evaluation Method for Power Systems Conside...

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7th IEEE Conference on Energy Internet and Energy system Integration, EI2 2023

作者： Liu, Ren Xu, Xingye Du, Wei Xiahou, Kaishun Zhu, Yihua Chang, Dongxu Guo, Hengdao Electric Power Research Institute of China Southern Power Grid Csg Key Laboratory For Power System Simulation Guangzhou China School of Electric Power Engineering South China University of Technology Guangzhou China Electric Power Research Institute of China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China China Southern Power Grid National Energy Power Grid Technology R&d Centre Guangzhou China Intelligent Operation and Control For New Energy Power System Guangdong Provincial Key Laboratory of China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350345094

With the increasing level of informatization and interconnection in the electric power system, the risk of external attacks on power systems is increasing. In response to the drawbacks of traditional static security assessment methods, this paper establishes two security metrics, which are voltage and power flow amplitude deviation security metric and power flow entropy security metric. Based on these security metrics, a dynamic security evaluation model that considers cascading failure is proposed. simulation results demonstrate that the proposed security metrics can effectively reflect the security of cascading failure propagation, thereby providing valuable insights for decision-making by power system operators. © 2023 IEEE.

关键词： Informatization

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Load Regulation Strategies of Solid Oxide Electrolysis system Coupled with External Heat Sources

Load Regulation Strategies of Solid Oxide Electrolysis Syste...

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243rd ECS Meeting

作者： Cui, Tonghui Han, Minfang Ni, Meng Fuel Cell and Energy Storage Center Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Tsinghua Innovation Center in Guangdong Dongguan523808 China Department of Building and Real Estate Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

ISBN: (纸本)9781607685395

Solid oxide electrolysis system requires electrical and thermal energy. Five scenarios are defined according to various cases of external heat sources coupling and electrical energy sources. Three methods are proposed to track variations in electrical or thermal load, including constant flow rate (F method), constant steam utilization (Us method) and constant cell operating voltage (V method). Through system process simulation, the applicability of three methods in different scenarios is explored to obtain load regulation strategies. In the scenario coupled with low-temperature heat and intermittent power and the scenario with no heat coupling, the F method is preferred at high loads and the V method is preferred at low loads, while it is the opposite in the scenario coupled with high-temperature heat and intermittent power. The V method is preferred at low loads in the scenario coupled with low-temperature heat and high loads in the scenario coupled with high-temperature heat. © The Electrochemical Society.

关键词： Temperature

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Advanced Out-of-Step Splitting Protection simulation Platform with Considering High Frequency generation Tripping and Low Frequency Load Shedding

Advanced Out-of-Step Splitting Protection Simulation Platfor...

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2022 IEEE International Conference on power systems and Electrical Technology, PSET 2022

作者： Liu, Ren Zhu, Yukun Zhu, Yihua Chang, Dongxu Wu, Mingkang Huang, Libin a. State Key Laboratory of HVDC b. National Energy Power Grid Technology R&D Centre c. Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System d. CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665489157

This paper presents an advanced out-of-step (OOS) splitting protection simulation platform considering high frequency generation tripping and low frequency load shedding. In the proposed simulation platform, Real-Time Digital Simulator (RTDS) is utilized as the real-time power system simulator. Through the high-speed I/O card, real industry OOS splitting protection device is integrated into the proposed simulation platform. Based on the real China South power Grid (CSG) control strategy, high frequency generation tripping and low frequency load shedding components are modelled in the simulation. CSG real grid is modelled in the RTDS to perform the Real-time hardware-in-the-loop simulation. simulation results present that there is a clear difference between with high frequency generation tripping results and without high frequency generation tripping results. © 2022 IEEE.

关键词： simulation platform

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Methodology for Capacity Credit Evaluation of Physical and Virtual Energy Storage in Decarbonized power system

arXiv

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arXiv 2023年

作者： Qi, Ning Li, Peng Cheng, Lin Zhang, Ziyi Huang, Wenrui Yang, Weiwei State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Co. Ltd Tongzhou District Beijing101100 China

Energy storage (ES) and virtual energy storage (VES) are key components to realizing power system decarbonization. Although ES and VES have been proven to deliver various types of grid services, little work has so far provided a systematical framework for quantifying their adequacy contribution and credible capacity value while incorporating human and market behavior. Therefore, this manuscript proposed a novel evaluation framework to evaluate the capacity credit (CC) of ES and VES. To address the system capacity inadequacy and market behavior of storage, a two-stage coordinated dispatch is proposed to achieve the trade-off between day-ahead self-energy management of resources and efficient adjustment to real-time failures. And we further modeled the human behavior with storage operations and incorporate two types of decision-independent uncertainties (DIUs) (operate state and self-consumption) and one type of decision-dependent uncertainty (DDUs) (available capacity) into the proposed dispatch. Furthermore, novel reliability and CC indices (e.g., equivalent physical storage capacity (EPSC)) are introduced to evaluate the practical and theoretical adequacy contribution of ES and VES, as well as the ability to displace generation and physical storage while maintaining equivalent system adequacy. Exhaustive case studies based on the IEEE RTS-79 system and real-world data verify the significant consequence (10%-70% overestimated CC) of overlooking DIUs and DDUs in the previous works, while the proposed method outperforms other and can generate a credible and realistic result. Finally, we investigate key factors affecting the adequacy contribution of ES and VES, and reasonable suggestions are provided for better flexibility utilization of ES and VES in decarbonized power system. © 2023, CC BY.

关键词： Behavioral research

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Application and Practice of Digital Twin Technology in Monitoring Status of power equipment in Converter Valve Hall

Application and Practice of Digital Twin Technology in Monit...

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Intelligent Communication and Computer Engineering (ICICCE), International Conference on

作者： He Yongsheng Deng Baojia Lu Zongxiang Zhang Shiling Dai Liangjun State Grid Chongqing Electric Power Company Electric Power Research Institute Deptartment of Electrical Engineering Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipment

The internal power equipment of ultrahigh voltage converter valve hall is numerous and complex in structure, involving the various information elements such as the temperature and vibration. Moreover, the gas inside ultra-high voltage converter bushing is SF6 gas. Under the current over-load condition of the converter bushing, SF6 gas will decompose. This article focuses on the SF6 gas equipment inside the ultrahigh pressure converter valve hall as the research object, and analyzes specific types and content of SF6 gas decomposition products. In order to effectively detect gas content in the digital twin model of the converter transformer bushing, the new portable SF6 gas chromatograph, laser detection technology and device for HF gas, and partial discharge detection technology research using the acoustic electric coupling method are carried out, providing the effective means for onsite detection of hidden faults in operating equipment. Research has shown the digital twin technology can effectively detect the absorption spectra of gases such as O2, H20, CO, CO2, CF4, SO2, H2S, SOF2, and SO2F2. On the other hand, through digital twin partial discharge detection technology, it is effectively found that the SO2 inside the UHV converter sleeve is 29μL/L, H2S is 4μL/L, CO is 36μL/L, HF=0, detected SO2 and H2S components, determined as the insulation heating defect. The research results of paper provide theoretical and data support for operation status monitoring of SF6 gas insulated power equipment inside the ultra-high voltage converter valve hall.

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Optimization Study on the control Strategy of DC Line Fault Recovery for Yongren-Funing HVDC 6

Optimization Study on the Control Strategy of DC Line Fault ...

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6th IEEE Conference on Energy Internet and Energy system Integration, EI2 2022

作者： Zhu, Yukun Huang, Libin Li, Shuyong Zhu, Yihua Song, Yantao Liu, Ren State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Electric Power Research Institute China Southern Power Grid CSG Key Laboratory for Power System Simulation Guangzhou China XJ Electric Co Ltd Xuchang China

ISBN: (纸本)9798350347159

The ±500kV Yongren-Funing HVDC transmission project is the first HVDC project whose sending and receiving ends are both located in the same province. When DC line fault happened under the condition of inter-communication fault between the pole control systems of the rectifier and inverter stations, the HVDC system cannot be blocked because of the frequent repeating actions of the DC line fault recovery in the inverter station. In order to solve the problem, an optimal control strategy of direct blocking HVDC system was proposed to solve the above issue. The optimization control strategy was verified by RTDS simulation. The simulation results showed that the proposed optimization control strategy of the DC line fault recovery could solve the above problems effectively. The proposed strategy has already been implemented on site permanently, which has great significance for the HVDC/UHVDC transmission projects in operation currently. © 2022 IEEE.

关键词： HVDC power transmission

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The harmonic characteristics analysis of offshore wind farms transmitted by the submarine cable based on time domain simulation 6

The harmonic characteristics analysis of offshore wind farms...

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2021 6th International Symposium on Advances in Electrical, Electronics and Computer Engineering, ISAEECE 2021

作者： Li, Jingyi Yang, Jianjun Shi, Zhaohui Wang, Ke Li, Haozhi Xie, Xiaorong Li, Fangfeng Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province Hangzhou Zhejiang311122 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Haidian District Beijing100084 China

The harmonic amplitude may exceed the limit when the large scale of wind farm is connected to the weak AC system through AC submarine cable. The harmonic with high amplitude will endanger the safety of power equipment, and even affect the normal integration of large-scale wind farm. This paper takes an actual offshore wind power connected to the system through AC submarine cable as an example. On the basis of building the model of the system in the PSCAD/EMTDC simulation software. The simulation calculation is systematically carried out. The effect of multiple factors on the harmonic characteristics is analyzed. The preliminary explanation for the harmonic amplitude out of limit is given for the actual large scale of wind farm connected to the weak AC system through AC submarine cable. © Published under licence by IOP Publishing Ltd.

关键词： Time domain analysis

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