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3rd International Conference on Electrical Engineering and control Science, IC2ECS 2023

作者： Dai, Liyu Deng, Chaoping Chao, Wujie Wang, Jinke Huang, Junwei Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou China

ISBN: (纸本)9798350382426

This paper presents a method of applying MMC based on battery energy storage system (BESS) to HVDC system to realize power decoupling control on AC and DC side. Firstly, the basic structure and working principle of MMC-HVDC system based on BESS are analyzed. Then, based on the mathematical equivalent model, the MMC-BESS decoupling control method based on DC power control is derived, and the AC-DC power decoupling control is realized. Finally, a +400kV MMC-HVDC system is built on the RTDS platform, and the proposed control strategy and power decoupling effect are verified. The results show that the MMC-BESS control strategy proposed in this paper is effective. The MMC-HVDC system based on BESS can realize active power decoupling control between AC side and DC side, and the unbalanced power between AC side and DC side can be compensated by the charge and discharge of BESS. © 2023 IEEE.

关键词： BESS control Strategy HVDC MMC

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An Assessment Method for the Contribution of Electrochemical Energy Storage to the FM Auxiliary Service Market

An Assessment Method for the Contribution of Electrochemical...

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2022 Asian Conference on Frontiers of Power and Energy, ACFPE 2022

作者： Xiong, Jiali Chen, Dawei Li, Zhicheng Zhang, Weijun Cai, Qiang Dai, Liyu Chao, Wujie Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian Key Laboratory of Smart Grid Protection and Operation Control Fujian China

ISBN: (数字)9781665470841

ISBN: (纸本)9781665470841

This paper proposes an evaluation method for energy storage (ESS) to participate in the FM auxiliary service market. The Area control Error is used as an influencing variable reflecting the FM effect of ESS, the correlation between 'FM power of ESS' and 'Area control Error' is established, and the FM effect value of ESS on Area control Error is obtained, eventually constructing an index to measure the FM contribution of ESS. Analyze the distribution of the FM contribution index of ESS based on confidence level, determining the contribution and economic benefits of energy storage in the FM market. Measure and calculate based on the actual operation data of a provincial power grid, this method can measure the FM contribution of ESS, providing a reference for the investment in ESS and development of mechanisms for participating in FM auxiliary service. © 2022 IEEE.

关键词： Investments

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Improved Droop control for Power grid Considering state-of-charge of Battery Energy Storage 3

Improved Droop Control for Power Grid Considering State-of-c...

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3rd International Conference on Electrical Engineering and control Science, IC2ECS 2023

作者： Chen, Yuge Li, Zhicheng Deng, Chaoping Zhang, Weijun Zhang, Shuling Gao, Tongtong Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou China

ISBN: (纸本)9798350382426

The constant droop coefficient (DC) in the traditional f-P and V-Q droop control is not conducive to the state-of-charge (SoC) management of the battery energy storage (BES) system. This paper proposes an improved droop control strategy (DCS) for the power grid which considers both the power frequency adjustment of the power system and the SoC management constraints of the BES. The proposed improved DCS is enabled to adjust the DC according to the SoC status of the BES. Case studies verify the effectiveness of the proposed DCS, which significantly reduces the frequency change deviation in the dynamic process of the weak power grid. © 2023 IEEE.

关键词： battery energy storage (BES) droop control frequency regulation state-of-charge

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The operation analysis of the CCHP driven by Gas-steam combined cycle 2

The operation analysis of the CCHP driven by Gas-steam combi...

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2nd International Conference on Oil and Gas Engineering and Geological Sciences, OGEGS 2020

作者： Liang, Junyu Yuan, Xingyu Gu, Jiangqi Yunnan Electric Power Research Institute Csg China Nari Group Co. Ltd State Key Laboratory of Smart Grid Protection and Operation Control

In combined cooling heating and power system, the gas-steam combined cycle is gradually used more and more. The common operation mode in CCHP is mainly to determine heat by electricity and heat by electricity. This paper defines an index indicator and analyzes the difference between the two operating modes in different intervals through the system energy supply interval chart, finally analyzes the difference in the indicators between the two operating modes through the actual load method. It is concluded that in winter operating conditions, the following the thermal load (FTL) operation mode is better;in summer operating conditions, the indicator of following the electric load (FEL) is better;during the transition season, the value of PEC is better in the case of following the thermal load. © Published under licence by IOP Publishing Ltd.

关键词： Thermal load

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Developing Characteristics of Oil-immersed Transformer Internal Fault with Dignostic Method Using Convergence Patterns of Free Gas 2

Developing Characteristics of Oil-immersed Transformer Inter...

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2nd IEEE China International Youth Conference on Electrical Engineering, CIYCEE 2021

作者： Zhang, Yucheng Hao, Zhiguo Zheng, Yuping Pan, Shuyan Li, Boyu Xue, Zhongxin Deng, Jinzhao Xi'An Jiaotong University School of Electrical Engineering Xi'an712000 China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing210000 China

ISBN: (纸本)9781665400640

Light gas protection only operates when gas within the transformer collection chamber reaches threshold volume. Such criterion failed to reflect transformer conditions accurately due to the lack of understanding for defect developing process and corresponding gas generation- convergence pattern, which has led to lower protection reliability and has caused several transformer explosions. To address current problem, an experimental tank with structure resembling that of a power transformer is set up, inside which the needle-plate oil-pressboard breakdown model is planted. Experimental results indicate that throughout fault development, voltage drops became more frequent until arcing occurs, so is HFCT signal;meanwhile gas generation rate increases through slight partial discharge, spark discharge and arcing stage, the collected gas volume corresponds with patterns above. The purpose of this study is to clarify the defect developing process and the gas generation-convergence pattern for oil-immersed transformer internal fault in guidance for a more reliable protection method. © 2021 IEEE.

关键词： Partial discharges

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Design of Experiment Management System for Stability control System Based on Blockchain Technology 1st

Design of Experiment Management System for Stability Control...

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1st BenchCouncil International Federated Intelligent Computing and Block Chain Conferences, FICC 2020

作者： Cui, Xiaodan Lei, Ming Yang, Tianshu Wu, Jialong Feng, Jiaqi Yang, Xinlei Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9789811611599

Stability control system (SCS) plays a very important role in the operation of power systems, so it is correspondingly essential to ensure the reliability of the SCS during its experimental and verification process. However, there are numerous problems in the management of the paper form based experiment mode of SCS today, such as long circulation cycle caused by low work efficiency, insecure and diseconomy on storage. More importantly, it is difficult to query and review historical records quickly, and it may even lead to the loss of records for various reasons. In this paper, taking advantage of blockchain technology, all the information of each experimental stage of SCS, including the approval information, experimental environment information, experimental equipment information of each manufacturer, experimental test reports and conclusions, are packaged and distributed managed. And then, a blockchain based experimental management system framework with the unified data form and module interface is proposed, in which the whole process of process record can be traced and cannot be tampered with. The experimental management system can be applied in the whole process of the SCS, including the experiment scheme making, experiment environment constructing, experiment processing, result evaluating, and results storage, etc. The blockchain based mechanism and system framework is expect to take many advantage to experiment management of SCS. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Blockchain

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Hybrid HVDC Transmission Line protection Method Based on Synchrosqueezing Wavelet Transform 1

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6th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2021

作者： Li, Xindong Dai, Wei Wu, Tonghua Teng, Xianliang Zheng, Kuncheng Hou, Xiaofan Wu, Dan State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China Nanjing211106 China

ISBN: (数字)9789811671562

ISBN: (纸本)9789811671555

The electromagnetic transient simulation model of hybrid HVDC transmission system is constructed based on the Baihetan—Southern Jiangsu Hybrid MTDC Transmission Project. The theoretical and simulation analysis targeting the transmission characteristics of boundary elements to line mode voltage fault components in Hybrid DC transmission system is conducted. Accordingly, a hybrid transmission line protection method based on fault voltage transient is proposed. The high and low-frequency energy ratio in line mode voltage fault components at both ends of the line is calculated to identify the internal and external faults of hybrid HVDC transmission line. Specifically, the extraction of transient component of line mode voltage and the characterization of its high-frequency energy are completed by synchrosqueezing wavelet transform. The calculation results show that, compared with the traditional continuous wavelet transform, the synchrosqueezing wavelet transform has better time–frequency concentration. According to the simulation results, such protection method can identify the internal and external faults of the line in a quickly and reliably manner, and can reliably act in case of high resistance grounding fault. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Wavelet transforms

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Converter Recovery Strategy to Reduce the Commutation Failure Risk of Capacitor Commuted HVDC Transmission System 6th

Converter Recovery Strategy to Reduce the Commutation Failur...

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6th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2021

作者： Pan, Yue Li, Wei Wang, Yu Lei, Jie Zhu, Ling Liu, Qianwei Nanjing China State Grid Corporation of China Beijing China State Key Laboratory of Smart Grid Protection and Control Nanjng China

ISBN: (纸本)9789811671555

Commutation failure is an important factor affecting the grid-connected safety of LCC DC systems. The Capacitor Commutated Converter (CCC) is used to improve the ability of DC to resist commutation failure, but it also introduces new problems. In this paper, firstly, the recovery characteristics of the CCC converter in the AC asymmetric fault scenario is analyzed, based on which, a "capacitor bypass-parallel grounding" fault recovery strategy is proposed. This strategy can reduce the risk of commutation failure during AC fault period and accelerate the speed of the power recovery after the fault cleaning, so as to reduce the impact of the fault on the system. Base on Cigre_Benchmark electromagnetic transient model, CCC HVDC system has been verified in simulation experiments. The proposed strategy can effectively reduce the number of commutation failures, the duration of commutation failures and the loss of active power. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： HVDC power transmission

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Transmission Line Distance protection Under Current Transformer Saturation

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Journal of Modern Power Systems and Clean Energy 2021年第1期9卷 68-76页

作者： Yuping Zheng Tonghua Wu Feng Hong Gang Yao Jimin Chai Zhinong Wei the College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China State Key Laboratory of Smart Grid Protection and Control NARI Group CorporationNanjing 211106China Changzhou Institute of Technology Changzhou 213032China

Conventional transmission line distance protection approaches are subject to malfunction under reverse fault-induced current transformer(CT) saturation for the typically employed breaker-and-a-half configuration. This paper addresses this issue by proposing a new distance protection approach that combines the blocking and unblocking criteria of distance protection based on the values of incomplete differential current,operation voltage, and current harmonic content. The proposed approach is verified by theoretical analysis, dynamic simulation testing, and field operation to ensure that the obtained distance protection is reliable and refrains from operating unnecessarily under reverse fault-induced CT saturation in the breaker-and-ahalf configuration. Meanwhile, the proposed approach is demonstrated can operate reliably when forward faults occur or various reverse faults are converted to forward faults.

关键词： Breaker-and-a-half configuration current transformer(CT)saturation distance protection power frequency variation operation voltage

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A Synchronization Stability Enhancement control Method for 100% Converter-based System Based on An Improved Kuramoto Model 5

A Synchronization Stability Enhancement Control Method for 1...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Zou, Yan Wang, Zhen Li, Zhicheng Xiong, Jiali Deng, Chaoping Cai, Qiang Zhejiang University School of Electrical Engeerning Hangzhou China State Grid Fujian Electric Power Research Institute Fujian Key Laboratory of Protection and Operation Control for Smart Grid Fuzhou China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

In this paper, a synchronization stability enhancement control method is developed to improve the stability performance of power systems with 100% converter-based renewable generation. An improved Kuramoto-type model is established with a time-variable power injection taken into consideration, which can represent load and/or generation variation. Then a consensus tracking controller (CTC) to help all generators to trace a reference bus with specified common frequency rapidly is developed. A group of new synchronization conditions and the attraction region based on the improved Kuramoto-type model are then derived. Further, a control gain design scheme for CTC is proposed based on the two derived stability rules, i.e., the phase angle cohesiveness and the frequency bounded. Finally, a modified three-machine nine-bus system is used to validate the effectiveness of the proposed method and a comparison study result show that the transient stability performance of 100% power-converter system can be greatly improved. © 2022 IEEE.

关键词： Synchronization

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