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Steady-state Voltage Security-constrained Optimal Frequency control for Weak HVDC Sending-end AC power Systems

Journal of Modern power Systems and Clean Energy 2024年第2期12卷 658-669页

作者： Qiangqiang Wang Liangzhong Yao Jian Xu Yuping Zheng Wei Li Wei Wang School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network(Wuhan University) Wuhan 430072China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation(State Grid Electric Power Research Institute)Nanjing 211106China

Due to the fact that a high share of renewable energy sources(RESs)are connected to high-voltage direct current(HVDC)sending-end AC power systems,the voltage and frequency regulation capabilities of HVDC sending-end AC power systems have *** has resulted in potential system operating problems such as overvoltage and overfrequency,which occur simultaneously when block faults exist in the HVDC *** this study,a steady-state voltage security-constrained optimal frequency control method for weak HVDC sending-end AC power systems is *** integrated virtual inertia control of RESs is employed for system frequency *** dynamic reactive power compensation devices are utilized to control the voltage of all nodes meet voltage security ***,an optimization model that simultaneously considers the frequency and steady-state voltage security constraints for weak HVDC sending-end AC power systems is *** optimal control scheme with the minimum total cost of generation tripping and additional dynamic reactive power compensation required is obtained through the optimization *** are conducted on a modified IEEE 9-bus test system and practical Qing-Yu line commutated converter based HVDC(LCC-HVDC)sending-end AC power system to verify the effectiveness of the proposed method.

关键词： Renewable energy source(RES) high-voltage direct current(HVDC) AC power system optimal frequency control steady-state voltage security dynamic reactive power compensation

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Review on Optimization of Nuclear power Development:A Cyber-Physical-Social System in Energy Perspective

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Journal of Modern power Systems and Clean Energy 2022年第3期10卷 547-561页

作者： Xinxin Yang Bin Cai Yusheng Xue School of Electrical Engineering Southeast UniversityNanjingChina State Grid Electric Power Research Institute(NARI Group Corporation) NanjingChina State Key Laboratory of Smart Grid Protection and Operation Control NanjingChina

Nuclear power development is a complex issue spanning cyber,physical,and social systems that is essential to achieving energy security and climate *** the ongoing worldwide trend towards carbon neutrality,the positioning of nuclear power in energy mix should be *** paper aims to present a systematic review of current research on optimization of nuclear power *** concept of cyber-physical-social system in energy(CPSSE)is adopted,which provides a suitable perspective and enables the review of relevant studies to achieve some novel *** on the CPSSE,firstly,a research framework is established and the main research elements in optimization are identified,followed by a proposed conceptual risk-based optimization ***,current studies are analyzed and classified into four categories according to the research *** status quo and limitations are *** is found that the research results of nuclear-specific issues have not been well integrated into the optimization of nuclear *** a relatively reliable power supply,nuclear power is capable of maintaining power and electricity adequacy of the whole system,especially in the case of power shortage caused by long-period low output of renewable energy or extreme external *** superiority should not be ignored in the *** critical factors that should be further considered include disruptive technologies,nuclear safety,energy policies,and stakeholder ***,suggestions are given for future research.

关键词： Carbon emission carbon neutrality cyber-physical-social system in energy(CPSSE) comprehensive evaluation dynamic interactive hybrid simulation energy transition multi-objective optimization

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Distributed Robust Optimal Dispatch of Regional Integrated Energy Systems Based on ADMM Algorithm with Adaptive Step Size

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Journal of Modern power Systems and Clean Energy 2024年第3期12卷 852-862页

作者： Zhoujun Ma Yizhou Zhou Yuping Zheng Li Yang Zhinong Wei the College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China State Grid Jiangsu Electric Power Co. Ltd.Nanjing 210019China State Key Laboratory ofSmart Grid Protection and Control NARI Group CorporationNanjing 211106China

This paper proposes a distributed robust optimal dispatch model to enhance information security and interaction among the operators in the regional integrated energy system(RIES).Our model regards the distribution network and each energy hub(EH)as independent operators and employs robust optimization to improve operational security caused by wind and photovoltaic(PV)power output uncertainties,with only deterministic information exchanged across *** paper also adopts the alternating direction method of multipliers(ADMM)algorithm to facilitate secure information interaction among multiple RIES operators,maximizing the benefit for each ***,the traditional ADMM algorithm with fixed step size is modified to be adaptive,addressing issues of redundant interactions caused by suboptimal initial step size settings.A case study validates the effectiveness of the proposed model,demonstrating the superiority of the ADMM algorithm with adaptive step size and the economic benefits of the distributed robust optimal dispatch model over the distributed stochastic optimal dispatch model.

关键词： Regional integrated energy system(RIES) distributed optimization robust optimization operation security energy hub(EH)

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Decision Support System for Adaptive Restoration control of Distribution System

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Journal of Modern power Systems and Clean Energy 2022年第5期10卷 1256-1273页

作者： Lili Hao Yusheng Xue Ze Li Haohao Wang Qun Xu School of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816China State Grid Electric Power Research Institute(NARI Group Corporation) NanjingChina State Key Laboratory of Smart Grid Protection and Operation Control NanjingChina State Grid Qingdao Power Supply Company QingdaoChina

Aiming at the high-dimensional uncertainties of restoration process, an optimization model for distribution system restoration control is proposed considering expected restoration benefits, expected restoration costs, and security risks of the overall restoration scheme. In the proposed model, the effect of security control on restoration process is actively analyzed considering the security control costs of preventive, emergency, and correction controls. A two-layer decision support framework for distribution system restoration decision support system(DRDSS) is also designed. The upper layer of the proposed framework generates the pre-adjustment schemes of operation mode for energized power grid by load transfer and selects the optimal pre-adjustment scheme and the corresponding partitioning scheme based on the partition adjustment results of each pre-adjustment scheme. In addition, it optimizes the spatial-temporal decision-making of the inter-partition connectivity. For each partition, the lower layer of the proposed framework pre-selects the units and loads to be restored according to the pre-evaluated restoration income, generates the table of alternative restoration scheme for coping with uncertain events through simulation and deduction, and evaluates the risk and benefit of each *** the uncertain events in the actual restoration process, the current restoration scheme can be adaptively switched to a sub-optimal scheme or re-optimized if necessary. Meanwhile, the proposed framework provides an information interaction interface for collaborative restoration with the related transmission system. A 123-node test system is built to evaluate the effectiveness and adaptability of the proposed model and framework.

关键词： Distribution system restoration pre-adjustment of operation mode load transfer dynamic partitioning risk and benefit security control

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A Study of Nanosecond Clock Synchronization Methods for Real-Time Transient Simulation 6

A Study of Nanosecond Clock Synchronization Methods for Real...

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6th International Conference on Communications, Information System and Computer Engineering, CISCE 2024

作者： Guo, Qi Lu, Yuanhong Zhang, Jingyue Zhang, Jie Guo, Haiping Hu, Binjiang Electric Power Research Institute China Southern Power Grid State Key Laboratory of HVDC China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Electric Power Research Institute China Southern Power Grid Csg Key Laboratory for Power System Simulation Guangdong China

ISBN: (纸本)9798350353174

Conventional nanosecond clock synchronization protocols are generally target-type or content-type, the synchronization rate is low, which leads to the increasing of the mean value difference of synchronization, so we propose to study the design of nanosecond clock synchronization method for real-time transient simulation. Combined with the actual clock synchronization requirements, we first calculate the link congestion coefficient, adopt a multilevel approach to strengthen the synchronization rate, set up a multilevel clock synchronization protocol, based on which we determine the clock source quality coefficients and construct a nanosecond clock synchronization model for real-time transient simulation, and use redundancy processing to achieve clock synchronization. The test results show that compared with the high-efficiency phase-color clock synchronization method and the cross-clock synchronization method, the mean synchronization difference of the designed transient simulation nanosecond clock synchronization method is controlled to be less than 0.5, which indicates that the designed clock synchronization method is more efficient, stable, and targeted, and the synchronization effect is significantly improved. © 2024 IEEE.

关键词： Mechanical clocks

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Influence of Capacitive Voltage Transformer Parameters on Harmonic Transmission Characteristics 12

Influence of Capacitive Voltage Transformer Parameters on Ha...

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12th International Conference on Renewable power Generation, RPG 2023

作者： Li, Xindong Wu, Tonghua Lv, Yichao Jiang, Jiaheng Zhang, Chenhao State Key Laboratory of Smart Grid Protection and Operation Control State Grid Electric Power Research Institute Nanjing China Xi'an Jiaotong University Xi'an China

Capacitive voltage transformer (CVT) has the advantages such as low insulation cost, small size and large electric field strength margin, so it is widely used in voltage measurement, relay protection and high frequency communication. However, CVT has the capacitors and inductors in its structure, these components are sensitive to frequency, so it can not accurately measure harmonics. Considering the stray capacitance and coupling capacitance of capacitive voltage transformer, the broadband response equivalent circuit model of CVT is established, and a cascade hierarchical analysis method is proposed to deduce the complete transfer function. On this basis, the influence of key parameters of CVT on harmonic transmission characteristics is simulated and analysed. The simulation results show that the increase of compensation reactor stray capacitance will make the resistance band move to the low frequency direction, the stray capacitance of the primary side of the intermediate transformer affects the attenuation degree of the high frequency band, and the effect of secondary side of transformer stray capacitance on the frequency response of CVT can be ignored. The results have reference significance for accurate harmonic measurement and manufacturing of CVT. © The Institution of Engineering & Technology 2023.

关键词： Relay protection

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Compact Valve Hall Layout of DC Transformer for Offshore Wind Farm All-DC Collection Platform 7

Compact Valve Hall Layout of DC Transformer for Offshore Win...

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2024 7th International Conference on Mechanical, Electrical and Material Application, MEMA 2024

作者： Huang, Junwei Chao, Wujie Deng, Chaoping Dai, Liyu Wang, Jinke Electric Power Research Institute of State Grid Fujian Electric Power Co. Ltd. Fuzhou350007 China Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou350007 China

To solve the problems of high investment cost, difficulty in improving AC collection efficiency, and broadband resonance in flexible DC transmission of offshore wind power, researchers have proposed an all-DC collection system. To further optimize the economic efficiency of offshore wind farm engineering, this paper studies on the compact valve hall layout of DC transformer for offshore wind farm all-DC collection platforms. The minimum air clearance inside the valve hall was determined based on the insulation level of the DC transformer, and a compact valve hall layout plan for the DC transformer was proposed, taking into account factors such as the electrical main wiring scheme, weight distribution, and symmetrical balance. The proposed compact valve hall layout scheme for DC transformers can reduce the volume of offshore all-DC collection platforms, save engineering construction costs, and improve the efficiency of offshore wind farms. This article can provide reference and guidance for subsequent research on all-DC collection and economic transmission of large-scale offshore wind farms. © Published under licence by IOP Publishing Ltd.

关键词： Offshore wind farms

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The Optimization Method for key control Parameters of Wind Turbines to Suppress Transient Overvoltage in Wind-Fire Bundling AC/DC power Delivery System 4

The Optimization Method for Key Control Parameters of Wind T...

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4th International Conference on intelligent power and Systems, ICIPS 2024

作者： Liang, Zhuohang Ling, Wuneng Li, Chengxiang Liang, Zhencheng Xiong, Li Liang, Yangdou Electric Power Research Institute China Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Guangxi Power Grid Dispatch and Control Center Nanning China

ISBN: (纸本)9798331532765

This paper analyzes the causes of overvoltage in the sending-end grid due to phase-change failures in the receiving-end grid, based on the operational principles and control methods of conventional high-voltage DC transmission. It systematically examines the operational characteristics of the sending-end grid voltage during transient processes. Considering the control strategy and output power expression of direct-drive wind turbines connected to the grid, and in accordance with current control requirements for voltage transients in wind turbine units, the study identifies parameter values affecting the control performance of voltage transients. It proposes a key control parameter optimization model aimed at minimizing fluctuations in the terminal voltage of wind turbines during voltage faults, integrating a simulated annealing optimization algorithm. Detailed implementation steps for optimizing key parameters are provided. Finally, the effectiveness of the proposed method in suppressing overvoltages at the terminal of wind turbines is validated using a model built on an electromechanical transient simulation platform. © 2024 IEEE.

关键词： Simulated annealing

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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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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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