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检索条件"机构=Key Laboratory of Intelligent Dispatching and Control of Power Grid"

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Synchronization Stability Analysis of Wind Farms Integrated MMC-HVDC System

Synchronization Stability Analysis of Wind Farms Integrated ...

引用

International Conference on power System Technology (powerCON)

作者： Li Li Changlong Qin Changtao Kan Jialun Yang Guanqun Li State Grid Jinan Power Supply Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

High-voltage direct current (HVDC) based on modular multilevel converter (MMC) is an efficient way to integrate wind farms. However, following short-circuit fault on transmission line, wind turbines (WTs) may lose synchronization with sending-end MMC. As a result, delivery and consumption of wind power are under risk. This paper investigates the mechanism of synchronous instability of wind farm integrated MMC-HVDC system under the severe grid faults. First, a synchronization stability model of the whole is stablished, the existing of stable equilibrium points (SEPs) and the damping characteristic of the whole system are analyzed. Then, a synchronization stability enhancement strategy is proposed based on the coordination of WT and MMC. Last, the effectiveness of proposed strategy is verified by time-domain simulation.

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Analysis of the Impact of Urban and Electric power Big Data Economy on Pollution Reduction and Carbon Reduction Based on Benchmark Regression Model

Analysis of the Impact of Urban and Electric Power Big Data ...

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Clean Energy Storage and power Engineering (CESPE), International Conference on

作者： Zixuan Qi Xiangyu Kong Yang Wang Yi Gao Shuai Luo Tianchun Xiang Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China China State Grid Tianjin Electric Power Company Tianjin China Economic and Technical Research Institute of State Grid Tianjin Electric Power Company Tianjin China

ISBN: (数字)9798331511708

ISBN: (纸本)9798331511715

Currently, in promoting ecological civilization construction in China, the coordinated governance of pollution and carbon reduction is regarded as the core strategy and implementation focus. As a new economic transformation and upgrading model, the Electric power big data economy is becoming essential in promoting this process. The entropy method is used to construct evaluation indicators for the Electric power big data economy, pollution reduction, and carbon reduction. Subsequently, a benchmark regression model was built for testing based on carefully considering other variables that may affect pollution reduction and carbon reduction through benchmark regression analysis. Finally, exploring the diversity and specificity of the impact of the Electric power big data economy on pollution reduction and carbon reduction from different dimensions - regional economic differences, Electric power size classification, and specific backgrounds of each city's development stage aims to provide targeted strategic recommendations for policymakers, ensuring the coordinated promotion of the healthy development of Electric power big data economy and environmental protection goals.

关键词： Economics Analytical models Pollution Biological system modeling Urban areas Carbon dioxide Big Data Benchmark testing Data models power systems

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Screening of Areas with High Risk of Short-Circuit Current Exceedance in power Systems with Renewable Energy Integration

Screening of Areas with High Risk of Short-Circuit Current E...

引用

IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Jian Wang Haoran Chen Hang Qi Changgang Li Wei Dong Yi Lu Wen Hua Zhengyang Zhou Longfei Wang Ying Cheng Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Zhejiang Electric Power Co. Ltd. Research Institute Hangzhou China

ISBN: (数字)9798350373479

ISBN: (纸本)9798350373486

The efficient short circuit calculation is the basis of short circuit current control. Commonly, the iterative calculation method of short-circuit current is adopted in power systems containing renewable energy sources. However, the detailed short-circuit current screening for all areas in power systems is time-consuming. To address this problem, this paper proposes an efficient screening method for areas with high risk of short-circuit current exceedance. Firstly, this paper builds the short-circuit models of synchronous generator and renewable energy source. Then, an efficient approximate calculation method of the maximum short-circuit current is proposed. Finally, a screening method for high-risk areas with short-circuit current exceeding limit is proposed, and an index of screening performance is defined. The validity of the proposed method is verified with a modified New England 39-bus power system.

关键词： Electrical engineering Renewable energy sources power transmission lines Short-circuit currents Asia Synchronous generators power systems

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Preventive control Method of Improving Transient Voltage Stability for power System Based on the Attention of CNN

Preventive Control Method of Improving Transient Voltage Sta...

引用

Sustainable power and Energy Conference (iSPEC)

作者： Zhendong Li Jiongcheng Yan Yutian Liu Li Li Hanbing Qu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Jinan Power Supply Company Jinan China

The widespread integration of renewable generation and the changes in load structure bring significant challenges to the transient voltage stability of large-scale power systems. In order to achieve fast decision of preventive control for improving transient voltage stability, this paper proposes a preventive control method based on the attention of Convolutional Neural Network (CNN). An optimization decision model is established, which not only considers multiple traditional constraints but also introduces the model attention indicator based on Gradient-weighted Class Activation Mapping (Grad-CAM), enabling a more targeted improvement of transient voltage stability. The proposed indicator is capable of extracting the knowledge learned by CNN-based transient voltage assessment model, and utilizing it to guide the optimization decision-making of preventive control. Simulation results of provincial grid of eastern China demonstrate that the optimized control scheme can effectively enhance the transient voltage stability of power systems.

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Impact assessment for large-scale off-grid of renewable energy on weakly interconnected systems

Impact assessment for large-scale off-grid of renewable ener...

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China International Electrical and Energy Conference (CIEEC)

作者： Li Li Changlong Qin Xin Dong Rongfei Qiao Jialun Yang State Grid Jinan Power Supply Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

Under the background of increasingly serious off-grid problems of renewable energy, this paper analyzes the impact of large-scale off-grid of renewable energy and voltage stability in the weakly interconnected system. First, an improved index is proposed based on Simpson formula for assessing transient voltage stability and achieving early warning of instability risk. Then, based on the simulation of a real-life UHV (Ultra-high voltage) weakly interconnected system, two typical cascading failure scenarios are reasonably anticipated. These cascading failures contain a series of renewable energy off-grid and blocking of DC transmission caused by different initial failures, whose voltage stability is evaluated by the proposed index. Besides, the nature of cascading failure evolution is analyzed. Finally, accuracy and efficient of the proposed index are verified.

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Protection Scheme for Hybrid Cascade HVDC Transmission Line Based on Current control Adjustment Deviation

Protection Scheme for Hybrid Cascade HVDC Transmission Line ...

引用

IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Jiangming Shen Haotian Cheng Zhongping Liu Hai Ye Hulin Liu Qiang Gui Xiaodong Zheng Nengling Tai Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China Dispatching Control Center East China Branch of State Grid Corporation of China Shanghai China

Hybrid cascaded high voltage direct current (HVDC) transmission adopts the form of modular multilevel converter (MMC) and line-commuted converter (LCC) in series, which not only reduces the investment cost, but also reduces the fault current. In this paper, the topology and control strategy of the hybrid cascade HVDC transmission system is introduced firstly. Then, the fault characteristics of current control signal in converter is analysed. The polarity of current control signal adjustment deviation is different in AC/DC faults. Thus, this paper proposes a protection scheme for hybrid cascade HVDC transmission based on current control adjustment deviation. A hybrid cascaded HVDC transmission is modelled in PSCAD\EMTDC. The simulation results show that the proposed method is applicable to different fault circumstances. And the proposed method has strong fault transition resistances and anti-noise abilities.

关键词： Current control Fault diagnosis Multilevel converters HVDC transmission Simulation High-voltage techniques Reliability engineering

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Voltage Waveform Comparison Longitudinal Protection Method Based on Improved Bhattacharyya Coefficient for AC / DC Hybrid power grid

Voltage Waveform Comparison Longitudinal Protection Method B...

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Electrical Engineering and control Science (IC2ECS), International Conference on

作者： Hongzhe Zhang Wei Cong Lin Li Meiyang Zuo Yu Zhu Jiadong Xu Xu Dong Chen Li State Grid Jinan Power Supply Company Jinan Shandong China Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Jinan Shandong China

If a fault happens on the AC line of a new form of AC/DC hybrid power grid, the fault characteristics and changes in electrical quantities after faults in a new type of power grid are completely different from traditional grids. The protection based on the electrical quantity of traditional AC systems will be affected. A method to solve the problem is put in this article. This article investigates the relationship between waveform similarity and fault location, and the improved Bhattacharyya coefficient method is applied to judge the similarity. Longitudinal protection logic is used to distinguish between the two types of faults. The simulation results which are based on PSCAD show that the method is applicable.

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Energy Storage Participation in Peak Shaving Market Operation Strategy Based on System Supply and Demand Margin

Energy Storage Participation in Peak Shaving Market Operatio...

引用

China International Conference on Electricity Distribution, CICED

作者： Houyu Qi Haibo Zhang Songtao Huang Guozheng Shang Rui Duan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing Beijing China Dispatching Control Center State Grid Inner Mongolia Eastern Electric Power Co. Ltd. Hohhot China

ISBN: (数字)9798350368345

ISBN: (纸本)9798350368352

Existing energy storage operation strategies take renewable energy unit consumption as the main goal, and often operate in conjunction with renewable energy projects, resulting in low energy storage utilization rate and insufficient driving force for energy storage operators to develop independent energy storage. However, with the implementation of independent energy storage operation support policies, the regional peak shaving service market gradually expands to include energy storage. Energy storage can have a positive impact on the economy of the power system as well as its utilization rate. According to the historical East Inner Mongolia power grid operational data, this paper established the annual chronological operation simulation model of peak shaving market participation by energy storage. By analyzing and summarizing the results of energy storage operation state obtained from the annual operation simulation, the energy storage operation strategy of taking part in peak shaving market based on system supply and demand margin was proposed. The two charge and two discharge or three charge and two discharge strategy, which are the most common operation modes of operation simulation, are compared with the proposed operation strategy. It is evident that energy storage's involvement in system peak shaving can lessen thermal units' peak shaving pressure, enhance the benefits of energy storage as a market participant for auxiliary services and the system's overall efficiency in terms of electricity consumption.

关键词： Renewable energy sources Supply and demand Electricity Force Discharges (electric) power grids Data models Energy storage

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Coordinated control Strategy for Fault-Blocking of Modular Multilevel Converter in Hybrid Cascaded Ultra High Voltage Direct Current Transmission Systems Based on Protection Signal

Coordinated Control Strategy for Fault-Blocking of Modular M...

引用

IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Haotian Cheng Jiangming Shen Zhongping Liu Hai Ye Hulin Liu Jun Han Xiaodong Zheng Nengling Tai Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China Dispatching Control Center East China Branch of State Grid Corporation of China Shanghai China

For the abnormal phenomenon of non-faulty MMC after fault MMC blocking in Hybrid Cascaded Ultra High Voltage Direct Current (HC-UHVDC) transmission system, a coordinated control strategy based on control signals is proposed. The mechanism of overcurrent and overvoltage in non-fault MMC was analyzed. Additional current was added in the LCC rectifier control to suppress overcurrent and overvoltage. DC voltage is out of control when the MMC master station is fault-blocked. To solve this problem, an optimal control strategy is adopted to convert the slaver station to the new master station. The scheme is based on the protection signal to identify the fault converter station. After the converter station is blocked, the system can be safely and effectively restored to the stable state.

关键词： Fault diagnosis Surge protection Rectifiers Optimal control Switches High-voltage techniques Receivers

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Research on Polygonal Harmonic Impedance Boundary Model for AC System and Resonant Impedance Calculation Method

Research on Polygonal Harmonic Impedance Boundary Model for ...

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International Conference on power and Energy Technology (ICPET)

作者： Qing Li Qingming Xin Qian Chen Junjie Feng ZhiHua Xu Kang Qin Ziyue Qiu CSG EHV Power Transmission Company Electric Power Research Institute Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China EHV Power Transmission Company China Southern Power Grid Guangzhou China Power Dispatching Control Center China Southern Power Grid Guangzhou China

With the large-scale power electronic devices connected to the grid, the harmonic problem has become an important concern for the power system. The sector impedance or circular impedance boundary in traditional power system will increase the range of AC system harmonic impedance, polygonal impedance has become new choice for harmonic impedance boundary construction, but the method of polygonal harmonic impedance construction is not clear. In this paper, the construction methods of different polygonal harmonic impedance are studied, the different impedance construction and the influence on harmonic evaluation are compared, polygonal impedance construction method based on the sector boundary and resonant impedance calculation method are proposed. The polygonal harmonic impedance construction method proposed in this paper can be used more accurately for harmonic evaluation and reduce the capacity of filter devices, which is great significance for harmonic management of AC power grids.

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