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6th IEEE Information Technology and Mechatronics Engineering Conference, ITOEC 2022

作者： Chen, Jinyu Li, Zhicheng Fan, Yuanliang Li, Chao State Grid Fujian Electric Power Research Institute Fuzhou350007 China Fujian Key Laboratory of Protection and Operation Control for Smart Grid Fuzhou350007 China

ISBN: (纸本)9781665431859

Power conversion system is the key equipment to realize two-way energy transfer between energy storage battery and AC power grid. This paper introduces a design and control method of power conversion system for emergency power supply. The power conversion system can select grid connected operation or independent on load operation to meet the multi scenario application requirements of emergency power supply site. During grid connected operation, the input power is controlled by controlling the input current, and then the output voltage at the DC side is controlled. During independent load operation, the load voltage and frequency are controlled by controlling the output voltage amplitude and frequency of the converter. The proposed constant voltage current limiting control strategy can maintain the DC bus voltage near the reference value and improve the reliability of battery charge and discharge. © 2022 IEEE.

关键词： Electric power supplies to apparatus

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Research on Hybrid Active Power Filter and Its Control and protection System for LCC-HVDC 11

Research on Hybrid Active Power Filter and Its Control and P...

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11th Joint International Information Technology and Artificial Intelligence Conference, ITAIC 2023

作者： Chao, Wujie Dai, Liyu Huang, Junwei Chen, Mingquan State Grid Fujian Electric Power Research Institute Fuzhou350007 China Fujian Key Laboratory of Protection and Operation Control for Smart Grid Fuzhou350007 China

ISBN: (纸本)9798350333664

Filters are key equipment in LCC-HVDC projects. It filters out characteristic harmonics generated by the converter and prevents the effect of harmonics generated by converters on the AC power grid. Currently, most DC transmission projects use passive filters. The first use of hybrid active power filters in the Fujian Guangdong DC interconnection project. This paper introduces the application framework, theory, control and protection system design of hybrid active power filters in LCC-HVDC projects. © 2023 IEEE.

关键词： Characteristic harmonics control and protection Hybrid active power filters LCC-HVDC

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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 Communication Schemes for Digital-Physical Hybrid Simulation of the SSCS 6

Research on Communication Schemes for Digital-Physical Hybri...

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

作者： Liu, Qitao Xu, Jianbing Xu, Haibo Ding, Zhao Li, Manli Ren, Jinhua Yin, Zhaoyang NARI Technology Co. Ltd State Key Laboratory of Smart Grid Protection and Control Nanjing China State Key Laboratory of Smart Grid Protection and Control School of Electrical of Engineering Nanjing China

ISBN: (纸本)9798350347159

SSCS plays the essential role in power grid operation to ensure the control reliability and effectivity. Due to the power system becomes more complex, it is inevitable to improve the simulation technology for SSCS. Thus, a digital-physical hybrid simulation platform for SSCS is required. In this paper, the requirements of the digital-physical hybrid simulation platform are analyzed and focus on the design of communication schemes for digital-physical hybrid simulation. IEC61850 and Aurora based communication technical roadmaps are proposed for the communication between RTDS and DSSCHP. Also, two options are available for the communication between SSCDs and DSSCHP. © 2022 IEEE.

关键词： Simulation platform

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Research on Chinese Word Segmentation Algorithm based on Dictionary and Statistical Method and Its Application in the field of Power grid Control

Research on Chinese Word Segmentation Algorithm based on Dic...

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2022 Global Conference on Robotics, Artificial Intelligence and Information Technology, GCRAIT 2022

作者： Shen, Chao Dai, Jinxia Mao, Mengge Zhao, Kun Yan, Zhen Huang, Kun NanJing China State Key Laboratory of Smart Grid Protection and Control NanJing China

ISBN: (数字)9781665481922

ISBN: (纸本)9781665481922

In view of the particularity of Chinese word segmentation in the professional field of power grid regulation, the performance of Chinese word segmentation based on traditional statistical algorithm is frequently limited by the corpus training in the proprietary field, and the insufficient ability of Chinese word segmentation based on dictionary algorithm in identifying new words and disambiguation in the proprietary field. This paper proposes a Chinese word segmentation method based on the combination of dictionary and statistical method, and applies it to the application scenario of querying the operation status of power grid. This method constructs a professional dictionary in the field of power grid regulation by using the Double-Array Tree storage structure. Then using the CRF(Conditional Random Fields) train the text data to generate the model file, and the FMM(Forward Maximum Matching) method is used for Chinese word segmentation combined with the professional dictionary in the field of power grid regulation. A fast and accurate online word segmentation method in the field of power grid regulation is designed and implemented, it performs well in some main performance indexes. In the application scenario of querying the power grid operation status, the Chinese word segmentation results obtained by this method combined with the standard query sentence pattern realize the rapid classification of application scenario query and the accurate execution of operation commands, greatly improve the efficiency and accuracy of querying the power grid operation status, and improve the human-computer interaction experience. © 2022 IEEE.

关键词： Digital storage

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Research on Control Strategy and Simulation of MMC-HVDC System Based on Battery Energy Storage System 3

Research on Control Strategy and Simulation of MMC-HVDC Syst...

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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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Inverse-time Backup protection Based on Unified Characteristic Equation for Distribution Networks with High Proportion of Distributed Generations

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 202-212页

作者： Nana Chang Guobing Song Zhongxue Chang Yuping Zheng Xingang Yang the School of Electrical Engineering Xi’an Jiaotong UniversityXi’anChina State Key Laboratory of Smart Grid Protection and Control NARI Group CorporationNanjingChina Electric Power Research Institute of State Grid Shanghai Electric Power Company ShanghaiChina

The setting work of backup protection using steady-state current is tedious,and mismatches occasionally occur due to the increased proportion of distributed generations(DGs)connected to the power ***,there is a practical need to study a backup protection technology that does not require step-by-step setting and can be adaptively *** paper proposes an action sequence adaptive to fault positions that uses only positive sequence fault component(PSFC)*** the influence of DGs,the unified time dial setting can be obtained by selecting specific *** protection performance is improved by using the adjacent upstream and downstream protections to meet the coordination time interval in the case of metallic faults at the near-and far-ends of the ***,the expression and implementation scheme for inverse-time backup protection(ITBP)based on the unified characteristic equation is *** results show that this scheme can adapt to DG penetration scenarios and can realize the adaptive coordination of multi-level relays.

关键词： Inverse-time backup protection(ITBP) distributed generation(DG) positive sequence fault component(PSFC)voltage unified characteristic equation adaptive coordination

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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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Continuous Commutation Failure Suppression Method Based on Self-adaptive Auto-disturbance Rejection Proportional-integral Controller for HVDC Transmission System

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Journal of Modern Power Systems and Clean Energy 2020年第6期8卷 1178-1187页

作者： Tonghua Wu Yuping Zheng Qipu Liu Guoqiang Sun Xiaohong Wang Xindong Li the College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China NARI Group Corporation Nanjing 211106China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

Once an asymmetrical fault occurs on the AC side of the receiving-end of a high-voltage direct current(HVDC)transmission system,the current reference will be affected by the control regulation on the DC inverter side and the commutation voltage *** this case,the advance firing angle will fluctuate periodically,causing security threats to the *** the fault cannot be cleared in time,the effect may be even more ***,the traditional proportional-integral(PI)controller cannot effectively suppress the periodic components in the input error signal,which is an important cause of continuous commutation ***,the system requires more time to recover from the *** by this,a selfadaptive auto-disturbance rejection PI controller is proposed in this *** controller has the advantages of fast response speed and strong anti-interference ability of the auto-disturbance rejection *** one hand,it can automatically adjust PI,and the parameters can maintain the system’s adaptive *** the other hand,the discretization process satisfies the computer simulation *** applying the proposed controller to a system under constant current control and extinction angle control,the dynamic response speed can be improved and the robust performance of the system can be ensured when dealing with a wide range of ***,simulation results show that the proposed algorithm can effectively suppress the continuous commutation failure of DC transmission systems.

关键词： High-voltage direct current(HVDC)transmission continuous commutation failure periodic fluctuation self-adaptive auto-disturbance rejection proportional-integral(PI)controller computer simulation

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