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2020 IEEE/IAS Industrial and Commercial power System Asia, I and CPS Asia 2020

作者： Sun, Shoujing Cong, Wei Sheng, Yaru Chen, Ming Wei, Zhen Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China Tianjin University Key Laboratory of Smart Grid of Ministry of Education Tianjin China Qingdao Power Supply Company Shandong Electric Power Company State Grid Qingdao China

ISBN: (纸本)9781728143033

Soft open point (SOP) is applied to the power service restoration of the distribution network because of the advantages of flexible control mode and optimizing the operation of the distribution network. Taking advantage of parallel collaborative between independent peer smart terminals unit (STU) in distribution network and information interaction ways of working, distributed power service restoration method of distribution network considering soft open point is put forward, which brings the superiority of SOP in the aspect of power service restoration into full play and avoids the problem of large information collection and calculation in the centralized power service restoration method. Firstly, the structure, control mode and power service restoration model of SOP are introduced, and then the distributed power service restoration method of distribution network with SOP is described, which mainly includes distributed network topology search and the expression and calculation of constraint conditions. Finally, a numerical simulation is carried out to verify the effectiveness of the proposed method. © 2020 IEEE.

关键词： Restoration

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Research on protection Method of Medium Voltage DC Distribution Network

Research on Protection Method of Medium Voltage DC Distribut...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Shengwen Li Jinhao Wang Xiaoqian Chen Wenping Qin Yizhao Liu Zhongjie Wang Yang Yang Yong Ren Power Grid Technology Center Electric Power Research Institute of State Grid Shanxi Electric Power Company Taiyuan China Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

DC line protection is a key issue in the development of DC distribution networks. The biggest challenge is to identify fault sections quickly and reliably. In order to ensure the reliable operation of the DC grid, this paper takes a typical four-port ring medium voltage distribution network as an example to propose a DC protection network fault protection strategy based on DC inductors. Since the parameters involved in this criterion are all implemented by local measurements, it has the characteristics of real-time communication independent of off-site signals. The MMC-based four-port DC distribution network was modelled using a real-time digital simulator (RTDS), and a number of simulation experiments were performed to verify the effectiveness of the proposed protection scheme. The simulation results show that the proposed protection method not only can detect faults quickly and accurately, but also has a certain effect on detecting high-impedance faults.

关键词： Fault diagnosis Simulation Fault protection Distribution networks Medium voltage System integration Real-time systems

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Study on the Corresponding Relationship Between Critical Points of P-V Curve and V-Q Curve of Simple Thevenin Equivalent System

Study on the Corresponding Relationship Between Critical Poi...

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Electrical Engineering (CIYCEE), IEEE China International Youth Conference on

作者： Xuan Li Zhaowei Li Linlin Guan Xuelian Wu Yan Mei Jun Li State Key Laboratory of Smart Grid Protection and Operation Control State Grid Electric Power Research Institute Nanjing China

ISBN: (数字)9781728196596

ISBN: (纸本)9781728196602

With the further increase in power demand for highly concentrated load centers and the gradual formation of a power system with a high proportion of new energy sources, China will face severe risk of voltage instability. In this paper, firstly, the load bus voltage equation of simple Thevenin equivalent system is derived, and then the P-V and V-Q curves are obtained respectively. Secondly, the mutual restriction relationship between active and reactive power of load is discussed when there is a real value solution to the voltage. Finally, the relationship between the voltage of critical points of the P-V curves and the reactive power of the load, and the relationship between the voltage of critical points of the V-Q curves and the active power of the load are deduced respectively. The relationship of one-to-one correspondence between critical points of P-V curves and critical points of V-Q curves is proved according to the mutual restriction between active power and reactive power of load and monotonicity of critical voltage and load power function.

关键词： Electrical engineering Reactive power power demand Conferences power system stability Faces

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Optimal capacity allocation of pumped storage reservoirs considering the synergistic effect of small hydropower and agricultural irrigation in river basins

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Dianli Xitong Baohu yu Kongzhi/power System protection and control 2025年第11期53卷 1-13页

作者： Zhong, Hao Liu, Haoyu Shi, Yu Wang, Qiujie Zhang, Yonghao Wang, Xinghuo Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydro-power Station China Three Gorges University Yichang443002 China College of Electrical Engineering & New Energy China Three Gorges University Yichang443002 China State Grid Hunan Electric Power Company Changsha Power Supply Branch Changsha410035 China

In order to alleviate the shortage of flexible resources in power systems in remote areas and to reduce economic losses caused by the fluctuating and uncertain output of wind and solar power stations, this paper proposes an optimal capacity allocation method for pumped storage reservoirs considering the synergistic effect of small hydropower and agricultural irrigation station in river basins. First, the method fully utilizes the idle capacity of agricultural irrigation stations during different seasons and integrates them with small hydropower plants to form a pumped storage aggregation unit. Then, the uncertainties of wind, solar and hydro power in different seasons are modelled using scenario sets. Based on Gale-Shapley bilateral matching mechanism, wind and solar power stations act as the selection party and aim to maximize economic returns in the optimization model. The pumped storage aggregation unit acts as the receiving party and a two-layer optimal allocation model is established. The upper layer focuses on maximizing annual profits to determine reservoir capacity allocation, while the lower layer targets maximizing aggregation benefits to optimize the aggregated system. Finally, the combination of particle swarm optimization algorithm and CPLEX solver is utilized to solve the model. Case studies show that the proposed method can fully leverage the flexible regulation capability of the pumped storage aggregation unit and effectively cope with the volatility and uncertainty of wind and solar output. © 2025 power System protection and control Press. All rights reserved.

关键词： Hydro energy

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Adaptability Study on Out-of-Step Separation Devices of Complex Multiinfeed AC/ DC power Systems

Adaptability Study on Out-of-Step Separation Devices of Comp...

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International Conference on power System Technology (powerCON)

作者： Yong Chen Dongxu Chang Yihua Zhu Yukun Zhu Hengdao Guo Shengnan Li Electric Power Research Institute Ltd. of Yunnan Power Grid Co. KunMing China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid 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)9781665407380

The power flow distribution of the GuangxiGuangdong AC transmission section (GX-GD section) has changed greatly as Kunliulong and Lugaozhao three-terminal HVDC projects have been put into operation, and it is necessary to study on the adaptability of out-of-step separation devices. Based on the real primary system, an equivalent system model is proposed in this paper which can accurately locate the oscillation center and calculate the minimum voltage at the measuring point. Dynamic real-time simulation is carried out for various types and different principles of out-of-step separation devices. Typical problems such as unreliable out-of-step locking criterion in the fault process and device refusing to move when the oscillation center is located at the device installation point are found and solved At the same time, based on the power grid panoramic simulation test technology and the actual configuration of out-of-step separation devices, the problems in the coordination of out-of-step devices near the GX-GD section are comprehensively studied, and the suggestions of putting the wide area out-of-step separation system into operation as soon as possible are put forward. The improvement and optimization measures proposed in this paper have been applied in the real system.

关键词： Adaptation models Voltage measurement power measurement power system dynamics Stability criteria power system stability power grids

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Research on fast frequency response technology and device development of photovoltaic power station 4

Research on fast frequency response technology and device de...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Qin, Xiaodi Zhang, Xiaolin Ma, Xiaowei Xu, Haichao China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Beijing China Northwest Branch of State Grid Corporation of China Xi'an China

ISBN: (纸本)9781728196060

Traditional photovoltaic power plant doesn't participate in grid frequency regulation, as the increasing proportion of photovoltaic power in the whole power system, it may have a great impact on the frequency stability. The new standard DL/T 1870-2018 'Technical Specification for power System Network Source Coordination' issued in 2018 puts forward the requirements for fast frequency response performance of photovoltaic power plant. At some regions with high proportion of photovoltaic power in Northwest China, relevant departments have released documents successively, which claim the photovoltaic power plant should have the ability of fast frequency response. In this paper, according to the requirements of standard and local documents, the key technical indexes of fast frequency response of photovoltaic power plant are analyzed. Several typical schemes of fast frequency response renovation of photovoltaic power plant are listed. A high precision fast frequency response device is developed, the principle and control strategy of the device are introduced, this device is used in laboratory and photovoltaic power plant respectively. As shown in the field test, the fast frequency response performance of photovoltaic power plant is much better with this device, both the frequency regulation response time and power control accuracy are much better than conventional hydro-thermal power plant, this device has a high application value. © 2020 IEEE.

关键词： Frequency response

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Feasibility analysis of single-end equivalent modeling to LCC-HVDC transimission system 4

Feasibility analysis of single-end equivalent modeling to LC...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Wang, Bin Li, Zhizhong Guo, Qi Liu, Zhijiang Li, Shuyong Cui, Liu Tsinghua University Dept. of Electrical Engineering Beijing China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China National Energy Power Grid Technology RD Centre Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781728196060

The commutation failures seriously threaten the safe operation of hybrid AC/DC grid. Considering that commutation failure occurs only on the inverter side, it is very important to study the voltage controlled current source model of LCC HVDC single terminal measurement information with high equivalent accuracy, which is very important for the practicality of real-time electromagnetic transient simulation of LCC HVDC dynamic phasor model. In order to this problem, this paper further discusses the single terminal equivalent model of LCC HVDC system which does not depend on the measurement information of DC sending end AC system, and explores the estimation method of single terminal fast transient response of complex AC/DC coupling faults induced by AC side fault of LCC HVDC inverter station and participation of DC control separation. The error distribution of single terminal equivalent calculation is quantitatively analyzed to lay a foundation for the follow-up protection and control technology research. © 2020 IEEE.

关键词： Electric inverters

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Longitudinal protection Method based on Voltage Waveform Comparison for AC / DC Hybrid System

Longitudinal Protection Method based on Voltage Waveform Com...

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2020 IEEE/IAS Industrial and Commercial power System Asia, I and CPS Asia 2020

作者： Zhang, Hongzhe Cong, Wei Kong, Hao Chen, Ming Wei, Zhen Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Ministry of Education Jinan China Qingdao Power Supply Company State Grid Shandong Electric Power Company Qingdao China

ISBN: (纸本)9781728143033

When the tie line of the AC/DC hybrid system fails, the change of the electrical quantity on the inverter side is different from that of the traditional infinite AC power source. Sensitivity and reliability of traditional relay protection methods will be affected. A longitudinal protection method for AC / DC hybrid system based on voltage waveform comparison is proposed. The method bases on the conclusion that the waveform characteristics of the reference voltage and the measuring voltage are different in the case of internal and external faults, roughly determine the fault location through the Pearson correlation coefficient. Use longitudinal protection logic to give more accurate judgment results. The simulation results of PSCAD model show that the scheme in this paper can accurately identify the fault of the tie line of the AC/DC hybrid system, and has high reliability and good applicability. © 2020 IEEE.

关键词： Correlation methods

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Corrosion fault identification model of substation grounding grid based on PSO-LS-SVM 4

Corrosion fault identification model of substation grounding...

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4th International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2021

作者： Qin, Jun Miao, Jin Wu, Xi Wang, Zibo Shao, Shuai State Grid Wuxi Power Supply Company Wuxi Jiangsu China Key Laboratory of Networked Control Systems Chinese Academy of Sciences Shenyang China Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang China

As one of the important equipment to ensure the normal operation of substation, the performance of grounding grid has been highly concerned. In recent years, researchers propose that the theory of electromagnetic induction can be used to diagnose and identify the corrosion fault of substation grounding grid. In this paper, a fault classification model based on LS-SVM optimized by PSO is proposed to identify the corrosion fault of grounding grid. Firstly, the wavelet packet transform principle is used to filter the original data, and the wavelet packet energy is used to construct the fault eigenvalue as the input of the fault classification model. Based on LS-SVM, a corrosion fault classification model is constructed, and particle swarm optimization method is used to optimize the parameters of the model, which solves the problem of traditional SVM parameter optimization. Through the practical application in substation, the model proposed in this paper can identify the corrosion of grounding grid conductor without excavation and power failure, which provides an effective scheme for engineering application. © Published under licence by IOP Publishing Ltd.

关键词： Corrosion

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Peak shaving market mechanism of captive power plants considering energy consumption characteristics of enterprises

Peak shaving market mechanism of captive power plants consid...

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International Conference on power System Technology (powerCON)

作者： Hanghang Liu Daning You Yanbin Cai Guoqiang Zhang Hao Wang Li Zhang Dongying Power Supply Company State Grid Shandong Electric Power Company Dongying China Power Dispatching Control Center State Grid Shandong Electric Power Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China

ISBN: (纸本)9781665407380

The continuously increased renewable energy has brought tremendous pressure to the operation of power system. To enhance dispatching flexibility, it is necessary to build peak shaving market and include captive power plants in the transaction. Considering the peculiarity of captive power plants, a mechanism of captive power plants to participate in peak shaving auxiliary services market is proposed, in which the captive power plant must meet the enterprise's own demand for steam and heat when it takes part in market bidding and clearing. The mechanism is established on the basis of the provincial spot market, emphases are focused on declaration and settlement rules. Case studies show that the mechanism can make the captive power plant play its peak shaving role without affecting the production of the enterprise. Thus, the mechanism is practicable and promising in promoting the consumption of renewable energy.

关键词： Heating systems Couplings Renewable energy sources Energy consumption Production Dispatching power systems

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