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11th China International Conference on Electricity Distribution, CICED 2024

作者： Xue, Yinjuan Chen, Qifang Cai, Haiqing Xia, Mingchao Gu, Haohan School of Electrical Engineering Beijing Jiaotong University Beijing China State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&d Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350368345

With the rapid proliferation of Electric Vehicles (EV s), effectively leveraging the regulation potential of EV charging loads has become a prominent issue. This paper proposes a multi-type EV schedulability modeling method based on the analysis of charging behavior characteristics of different user types. The model comprehensively considers the charging characteristics of various types of EV s, including private cars, ride-hailing vehicles, and taxis, utilizing a charging start-stop probability distribution model. Case studies demonstrate that this model can not only accurately reflect the charging demands of EV s but also provide valuable references for strategies involving EV fleet participation in grid regulation. © 2024 IEEE.

关键词： Charging stations

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Modeling and simulation Method of Offshore power Delivery System with Hydrogen Production 4

Modeling and Simulation Method of Offshore Power Delivery Sy...

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4th International Conference on Electrical Engineering and Control Technologies, CEECT 2022

作者： Gu, Huaiguang Zhang, Jian Kou, Longze Zhou, Jiapei State Key Laboratory of Advanced Transmission Technology China Beijing Key Laboratory of Dc Power Grid Technology and Simulation China State Grid Smart Grid Research Institute Co. LTD. Beijing China

ISBN: (纸本)9781665498999

With the depletion of global fossil energy and the worsening of global environmental problems, the development and utilization of renewable clean energy has become an important direction in the world's energy technological change. Hydrogen energy, as a highly clean renewable energy, has become a research hotspot in the world. In this paper, a typical offshore energy system model is proposed. Firstly, according to the thermodynamic phenomena and electrochemical dynamic characteristics of the alkaline electrolyzer, the electromagnetic transient model of hydrogen production unit is established. Then, a grid-connected control scheme based on the direct current of the electrolyzer is proposed to connect the offshore wind farm with the hydrogen production system. Finally, a complete model is built on PSCAD and the electromagnetic transient simulation analysis is carried out. The results show that the system can provide stable and reasonable dc current to hydrogen production system through 60 mw wind farm, which verifies the correctness and effectiveness of the model. © 2022 IEEE.

关键词： Hydrogen production

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Overvoltage Suppression Strategy Based on Active Control of Current for Half-Wave Commutated Modular Multilevel Converters 14

Overvoltage Suppression Strategy Based on Active Control of ...

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14th International Conference on power and Energy Systems, ICPES 2024

作者： Liu, Bao Xu, Yunfei Zhao, Guoliang Fu, Nan Jia, Chen China Electric Power Research Institute State Key Laboratory of Advanced Power Transmission Technology Beijing China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Beijing China Electric Power Research Institute State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (纸本)9798350391329

Flexible low-frequency AC transmission technology combines the advantages of 50 Hz AC transmission and dc transmission, and has good application scenarios. High voltage and large capacity AC/AC converters are the core equipment of flexible low-frequency AC transmission systems. The proposal of half-wave commutated modular multilevel converters effectively reduces the number of components and improves system economy. In view of this, this paper proposes an overvoltage suppression strategy for active control of inductor current, which effectively reduces the overvoltage level during commutation. The article first introduces the sparse topology and mathematical model of the half-wave commutated modular multilevel converters. Secondly, the mechanism of overvoltage generation is analyzed. Then, overvoltage suppression strategies are proposed. Finally, a PSCAD simulation model is built to verify the effectiveness and feasibility of the proposed method through simulation. © 2024 IEEE.

关键词： Flexible AC transmission systems

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dc FAULT RIDE-THROUGH for WIND power INTEGRATION VIA MMC-HVdc BASED on PRECISE CONTROL of ENERGY STORAGE CONFIGURED INSIDE WIND FARM

DC FAULT RIDE-THROUGH for WIND POWER INTEGRATION VIA MMC-HVD...

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Renewable power Generation and Future power Systems Conference 2023, RPG 2023 UK

作者： Sun, Yinfeng Guo, Yuhang Fan, Fulin Fan, Jiabin Li, Guoqing Wang, Zhenhao Wu, Xueguang Jilin China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow United Kingdom State Grid Smart Grid Research Institute Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation Beijing China

ISBN: (纸本)9781839539848

The modular multilevel converter-based high voltage direct current (MMC-HVdc) overhead lines transmission scheme is the preferred option for wind power integration, though it is susceptible to dc faults. To ensure the connection of a wind farm (WF) to the grid during dc faults, this paper proposes a coordinated control strategy for dc fault ride-Through (FRT) based on the energy storage system configured inside the WF for wind power integration through a bipolar MMC-HVdc. In the case of an instantaneous dc fault, the non-fault pole is regulated to operate at full power state to maximise wind power transmission. The exceedance of available wind power outputs over the transmission capacity of the non-fault pole is then accurately allocated to the internal energy storage units (ESUs) of wind generators (WGs) in order to ensure the power balance of the system and reduce the state of charge variance of ESUs as soon as possible. In order to reduce the energy capacities of ESUs required to store the excessive wind power in the event of a permanent dc fault, the method of step-by-step removing WGs is adopted to ensure the system power remaining balanced when the internal ESUs of the disconnected WGs are out of operation. The model is developed and carried out on the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed control strategies. © The Institution of Engineering & technology 2023.

关键词： Poles

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Capacitor Voltage Balancing Strategy Based on Zero-Sequence Voltage Injection for Half-Wave Commutated Modular Multilevel Converter 10

Capacitor Voltage Balancing Strategy Based on Zero-Sequence ...

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10th IEEE International power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Fu, Nan Liu, Bao Xu, Yunfei Zhu, Sitong Wang, Kui Li, Yongdong Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Beijing100084 China State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Changping Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang110000 China

ISBN: (纸本)9798350351330

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. © 2024 IEEE.

关键词： Model predictive control

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Enhancing Autonomy Capability in Regional power grids:A Strategic Planning Approach with Multiple Autonomous Evaluation Indexes

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Energy Engineering 2024年第9期121卷 2449-2477页

作者： Jie Ma Tong Zhao Yuanzhao Hao Wenwen Qin Haozheng Yu Mingxuan Du Yuanhong Liu Liang Zhang Shixia Mu Cuiping Li Junhui Li Planning and Assessment Center Department State Grid Henan Economic Research InstituteZhengzhou450000China Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of EducationNortheast Electric Power UniversityJilin132012China Development Planning Department State Grid Henan Electric Power CompanyZhengzhou450000China Innovation Development Research Center State Grid Shanghai Energy Internet Research Institute Co.Ltd.Shanghai201210China State Grid Simulation Center China Electric Power Research Institute Co.Ltd.Beijing100192China

After the integration of large-scale DistributedGeneration(DG)into the distribution network,the randomness and volatility of its output result in a reduction of spatiotemporal alignment between power generation and demand in the distribution network,exacerbating the phenomenon of wind and solar power *** a novel power system model,the fundamental concept of Regional Autonomous power grids(RAPGs)is to achieve localized management and energy autonomy,thereby facilitating the effective consumption of ***,this paper proposes a distributed resource planning strategy that enhances the autonomy capabilities of regional power grids by considering multiple evaluation indexes for ***,a regional Energy Storage(ES)configuration strategy is *** strategy can select a suitable reference value for the upper limit of ES configuration based on the regional load andDGoutput to maximize the elimination of source load deviations in the region as the upper limit constraint of ES ***,a control strategy for regional ES is proposed,the charging and discharging reference line of ES is set,and multiple autonomy and economic indexes are used as objective functions to select different proportions of ES to control the distributed resources of the regional power grid and establish evaluation indexes of the internal regional generation and load power ratio,the proportion of power supply matching hours,new energy consumption rate and tie line power imbalance outside the region to evaluate changes in the regional autonomy *** final simulation results showthat in the real regional grid example,the planning method in the planning year in the region of the overall power supply matching hour ratio and new energy consumption rate increased by 3.9%and 4.8%on average,and the power imbalance of the tie line decreased by 7.8%on *** proposed planning approach enables the maximization of regional autonomy while effectively smoothing the fluct

关键词： Regional autonomous power grid distributed generation distributed energy storage regional planning strategy evaluation index

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Research on Transient Characteristics of an Improved Phase-locked Loop Topology Suitable for VSC Converters

Research on Transient Characteristics of an Improved Phase-l...

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

作者： Huaiguang Gu Jiapei Zhou Jinlong Qiu Jin Li State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation Beijing China State Grid Smart Grid Research Institute Co. Ltd Beijing China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

To solve the problem of deteriorating performance and poor stability of traditional PLL connected to weak AC system, an improved PLL structure is proposed in this paper. By measuring the angular velocity and initial phase Angle of the system respectively, the angular velocity of the system is first stabilized to ensure the synchronization between VSC and AC power grid, and then the initial phase Angle of the system is tracked by PI link to achieve accurate estimation and fast tracking of AC power grid phase Angle value. Finally, taking a classic VSC grid-connected system as an example, the effectiveness and stability of the improved PLL are verified by simulation.

关键词： Renewable energy sources power measurement power system stability Stability analysis Angular velocity Topology Velocity measurement Synchronization Phase locked loops Transient analysis

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A simulation and Test Method for Fault Current Suppression Branch in dc grid

A Simulation and Test Method for Fault Current Suppression B...

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International Conference on Electronics technology (ICET)

作者： Fangyuan Li Huaiguang Gu Jiapei Zhou Yang Gao State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute CO.LTD. Beijing China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

This paper is aimed at the research and verification requirements of fault current suppression devices applied in dc grids as actual physical test equipment. A joint test method based on digital and physical hybrid simulation is proposed, and a digital physical interface scheme is provided. It has engineering practical digital physical interface stability and accuracy, and plays a technical support role in the development of fault current suppression devices in dc grids. A fault current suppression branch is proposed for the combination of a current limiter and a high-voltage dc circuit breaker. The testing topology, main circuit interface, communication interface, and communication protocol requirements for the digital physical hybrid simulation of the fault suppression branch are proposed, and a platform for the connection of the current limiting device is developed. The experiment results show that after adding a current limiter to the current limiting branch, the maximum fault current decreases, the breaking current of the circuit breaker is reduced, and the requirements for the technical parameters of the circuit breaker are lowered.

关键词： Low voltage Limiting Protocols Circuit breakers power system dynamics power grids Topology

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key technology of Hybrid Cascaded UHVdc Transmission System 18

Key Technology of Hybrid Cascaded UHVDC Transmission System

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18th International Conference on AC and dc power Transmission, ACdc 2022

作者： Zhou, Jiapei Kou, Longze Gu, Huaiguang Zhu, Lin State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd. Beijing China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

The Baihetan-Jiangsu UHVdc transmission project is one of the backbone links of the West-East power transmission project in China. To meet the needs of the Baihetan-Jiangsu UHVdc transmission project, this paper proposes a hybrid cascaded HVdc transmission technology, in which sending-end adopts LCC and receiving-end adopts LCC-VSC in series. This technology can possess advantages of both LCC and VSC. This paper introduces the topology and key equipment of the hybrid cascaded HVdc system. Among them, the hybrid dc filter (H-dcF), the hybrid dc energy release device (H-dcERD) and fast bypass switch are innovatively utilized for the first time. Secondly, the control strategy of the system is studied, including the start-stop strategy, AC fault analysis and dc fault analysis. To verify the feasibility of the proposed hybrid cascaded HVdc transmission system, simulation tests for the system start-stop, AC fault and dc fault are carried out based on the simulation model built in PSCAD. The test results indicate that the hybrid cascaded HVdc technology has a smooth start-stop, flexible operation mode, reliable fault ride-through, and is feasible in engineering. © ACdc 2022. All rights reserved.

关键词： Transient analysis

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Real-time Optimal Energy Management of Combined Cooling, Heating and power systems Based on Knowledge conlusion 6

Real-time Optimal Energy Management of Combined Cooling, Hea...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： He, Chunjiang Wang, Yijian Xu, Yang Cui, Yang China Electric Power Research Institute State Key Laboratory of Power Grid Security and Energy Conservation Beijing China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Jilin China

ISBN: (纸本)9798350346671

Combined Cooling, Heating and power(CCHP) system is an important way to improve the efficiency of energy utilization and wind power consumption. In this case, increasing the operational flexibility of CCHP systems can help increase renewable energy consumption and reduce carbon emissions. So, it is necessary to provide real-time optimal energy management(OEM) for CCHP systems. In this paper. Firstly, a new training method is proposed for the LightGBM to improve the accuracy of real-time wind power prediction. In addition, to solve the nonlinear OEM of CCHP in real-time, a novel deep reinforcement learning algorithm-Soft Actor-Critic, is used in this paper. By combining the mechanism of CCHP with the reward function through knowledge fusion, the non-convex models can be translated into Markov Decision Processes(MDP), and then according to the Bellman optimal equation, the real-time optimized operation of the CCHP system is realized. Finally, the effectiveness of the proposed policy is verified by the actual operation data of a CCHP system in Northwest China. © 2023 IEEE.

关键词： Reinforcement learning

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