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检索条件"机构=State Key Laboratory of Operation and Control of Renewable Energy& Storage Systems"

共 607 条记录，以下是101-110 订阅

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Impedance Modeling and Stability Analysis of Grid-forming Converters

Impedance Modeling and Stability Analysis of Grid-forming Co...

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IEEE Transportation Electrification Conference and Expo (ITEC)

作者： Rui Zhao Xiaofeng Yang Ange Wei Jin Zhang State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China School of Electrical Engineering Beijing Jiaotong University Beijing China

ISBN: (数字)9798350317664

ISBN: (纸本)9798350317671

Grid-forming converters can provide inertial and damping support for high-penetration renewable energy grids. However, inadequate tuning of grid parameters may lead to system instability due to variations in grid strength. In this paper, based on harmonic linearization theory, the positive and negative sequence impedance models of grid-forming converters are derived. Then the suitability of grid-forming strategies in weak grids is discussed in conjunction with the Nyquist stability criterion. Additionally, the impact of grid-forming power loop parameters on system stability is revealed, aiming to provide theoretical support for the optimization design of grid-forming converter parameters. Finally, a time-domain simulation model of the grid-forming converter is constructed to validate the theoretical research under typical system parameters.

关键词： Damping renewable energy sources Analytical models Stability criteria Power system stability Harmonic analysis Mathematical models

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Buck converter-based error analysis of L/C model algorithm in real-time simulation

Buck converter-based error analysis of L/C model algorithm i...

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12th International Conference on renewable Power Generation (RPG 2023)

作者： W. Ji Y. Tu X. Zhang W. Dong State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute 100192 Beijing People's Republic of China

Hardware-in-the-loop real-time simulation has been increasingly applied for renewable power generation and grid-integration analysis with the involvement of power electronic converters. In this paper, based on a Buck converter, both time- and frequency-domain errors in real-time simulation applying L/C switching model algorithm are analysed. L/C model-based algorithm deal with the power electronic switch as a constant conductance in parallel with a changing current source, through which the simulation duration is essentially decreased compared to the traditional binary resistance (i.e., Ron/Roff) model. However, through L/C model algorithm, the original topology is modified and the transient switching loss is increased. Based on the Buck converter, this paper first analyses the power loss and the steady-state output deviation between the two simulation algorithms. Then, the output impedance of Buck circuit realized in the L/C model algorithm is established for the first time, which presents evidently deviations in low-frequency area compared to the theoretical small-signal linearizing model. Finally, the simulated steady-state output voltage and frequency-scanned output impedance verify the theoretical analyses.

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Combining Physical Mechanisms with Data-Driven Approaches for Short-Term Photovoltaic Power Forecasting

Combining Physical Mechanisms with Data-Driven Approaches fo...

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

作者： Xuan Yu Yue Xia Zheng Wang College of Information and Electrical Engineering China Agricultural University Beijing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

Accurate photovoltaic (PV) power forecasting is critical for the reliable and stable operation of the power grid. Most existing studies directly use weather conditions as data-driven inputs without incorporating PV physics models to improve the quality of input weather condition features. Therefore, a novel PV power forecasting method that combines physical models and data-driven approaches is proposed. First, a physical model of the PV system is established to convert solar irradiance data into the instantaneous observed irradiance received by the PV system. Then, this newly obtained irradiance data, along with other weather features, is used to reconstruct the data-driven inputs, achieving short-term power forecasting by combining physical models and data-driven approaches. Finally, simulation analysis is conducted using a real PV system dataset. The results show a significant improvement in forecasting accuracy, validating the effectiveness of the proposed method. The results indicate that this article combines physical mechanisms with data-driven approaches, fully considering the advantages and disadvantages of two commonly used models, greatly improving prediction accuracy.

关键词： Photovoltaic systems Solar irradiance Accuracy System integration Predictive models Prediction algorithms Data models Reliability Forecasting Meteorology

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Wind Power Forecast Based on Dimensionality Reduction Using Ridge Regression 5

Wind Power Forecast Based on Dimensionality Reduction Using ...

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5th International Conference on renewable energy and Power Engineering, REPE 2022

作者： Sun, Shuxin Wu, Fubao Qiao, Ying Lu, Zongxiang Hao, Yuchen Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Beijing100084 China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Nanjing China Control Ctr State Grid Jiangsu Elect Power Co Ltd Nanjing210017 China

ISBN: (数字)9781665482066

ISBN: (纸本)9781665482066

In order to reduce the randomness and fluctuation of wind power, numerical weather prediction is usually used to forecast power generation. Due to the redundancy of numerical weather prediction factors, dimensionality reduction is carried out to improve the effectiveness of data processing and reduce the complexity of algorithm. In this paper, the multicollinearity diagnosis is carried out to show the existence of multicollinearity among numerical weather prediction variables. The ridge regression method is adopted to screen variables, so as to reduce the dimension of numerical weather prediction data, which are trained later by back propagation neural network or convolutional neural network to fit corresponding power data. In comparison with results using training data without preprocessing, dimensionality reduction can improve predicting effect in most cases and reduce the error caused by improper selection of neural network. © 2022 IEEE.

关键词： Regression analysis

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An evaluation method for primary frequency regulation performance of renewable energy stations based on field recording data

An evaluation method for primary frequency regulation perfor...

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12th International Conference on renewable Power Generation (RPG 2023)

作者： Z. Shi W. Dong M. Liu R. Ju State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute) Haidian District Beijing People's Republic of China

The requirement that renewable energy units participate in the primary frequency regulation has been gradually introduced into the management rules of various localities. However, the current evaluation method of primary frequency regulation performance of renewable energy station focuses on the comprehensive evaluation of primary frequency regulation performance of the station and cannot accurately characterize its initial dynamic characteristics, so it is not suitable for field field recording data analysis. To this end, a segmental evaluation method for the performance of station primary frequency regulation is proposed in this study. Based on the description of the existing evaluation methods, their shortcomings are revealed. Then, according to the dynamic characteristics of primary frequency regulation, the field recording data are analysed and evaluated in segments to achieve the accurate characterization of the whole process of primary frequency regulation performance. The test results report that the proposed segmentation evaluation method can be effectively applied to the analysis on the field data of primary frequency regulation and accurately evaluate the primary frequency regulation performance of the station, which provides an alternative scheme for the real-time evaluation on the primary frequency regulation performance of the renewable energy station.

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Validation Method of Coordinated operation Strategy for Integrated Source-Network-Load-storage Projects in Power systems

Validation Method of Coordinated Operation Strategy for Inte...

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IEEE PES Asia-Pacific Power and energy Engineering Conference (APPEEC)

作者： Yanzhang Liu Fei Wang Minhui Qian Yalu Sun Kun Ding Bingbin Fu State Key Laboratory of Operation and Control of Renewable Energy &Storage Systems China Electric Power Research Institute Beijing China Economic and Technological Research Institute of State Grid Gansu Electric Power Company Lanzhou China

ISBN: (数字)9798350386127

ISBN: (纸本)9798350386134

With the increase of various elements in the source-network-load-storage projects and changes in the power system structure, its operating characteristics will become very complex. it requires continuous optimization of scheduling and operation control strategies to meet the production needs of the projects. Due to the significant differences in operational characteristics of different types of regulation resources in the projects at different time scales, it poses a challenge to formulating operational control strategies and verifying their effectiveness. This paper investigates a method for verifying the operation strategy of the projects based on power systems real-time simulation technology, providing technical support for in-depth research on the operation and control strategies of complex multi-source systems. The frequency response and power coordination control strategy have been verified through examples, which has certain engineering guidance for the operation of the integrated project.

关键词： renewable energy sources Protocols Production Real-time systems Frequency response Regulation Power grids Mathematical models IEC Standards Optimization

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Uncertainty analysis of annual wind speed in northern China and its potential impact on energy sector 2

Uncertainty analysis of annual wind speed in northern China ...

引用

2nd International Conference on Advanced Electrical and energy systems, AEES 2021

作者： Song, Zongpeng Feng, Shuanglei Wang, Bo Jin, Shuanglong Wang, Shu Hu, Ju Liu, Xiaolin Guo, Yuyang China Electric Power Research Institute Beijing100192 China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing100192 China

In this article, the wind energy uncertainty caused by annual wind speed variation in northern China is studied. The research time period is from 1991 to 2020, and the ERA5 reanalysis wind data is used. The uncertainty statistical indicators are the standard deviation percentage and the maximum deviation percentage of the average wind power density. The analysis results show that the uncertainty of wind energy in Qinghai, Xinjiang, Inner Mongolia, Shanxi is relatively large, these areas are more likely to experience large fluctuations of wind power. Among them, the standard deviation percentage of Qinghai and Xinjiang accounts for 15%-30% or higher. The maximum deviation percentage of Qinghai, Xinjiang, Inner Mongolia, Shanxi accounts for 30%-60% or higher. In addition, the empirical orthogonal function analysis (EOF) results show that there is an anti-phase mechanism of local wind energy fluctuations in Northern China, especially between the Northeast and Northwest regions, which implies that the power transmission between the Northeast and Northwest regions is helpful to reduce the wind energy uncertainty effect. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Wind power

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Research on New energy operation Credible Capacity Evaluation and It’s Influence on New energy Accommodation

Research on New Energy Operation Credible Capacity Evaluatio...

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IEEE Asia Power and energy Engineering Conference (APEEC)

作者： Jixian Qu Wenhui Shi Weikang Shan Zhankui Zhang Hong Bai State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute) Beijing China Huadian New Energy Group Corporation Limited Beijing China

The existing credible capacity of new energy mainly studies the comprehensive contribution of annual credible capacity of new energy to the reliability of power system from the perspective of sufficiency at the planning level. This paper establishes the available capacity probability model of wind power and PV power based on the probabilistic forecast, and calculates the operation credible capacity of new energy at every time under the same reliability level, and analyzes the influence factors of operation credible capacity. Besides, this paper establishes the time sequence simulation model which included the operation credible capacity into the start-up schedule of conventional units, and the new energy accommodation before and after the inclusion was calculated. The results show that, in the example, after incorporating the operation credible capacity of new energy into the unit start-up plan, compared with the traditional method, the utilization rate of new energy has increased from 93% to 95%.

关键词： Schedules Wind power generation Predictive models Probability Probabilistic logic Reliability engineering Power system reliability

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Maximizing Wind Power Injection by Transmission Switching and DLR with Voltage Stability Constraints

Maximizing Wind Power Injection by Transmission Switching an...

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2024 IEEE IAS Industrial and Commercial Power System Asia, I and CPS Asia 2024

作者： Wu, Ke Wang, Lei Ha, Hengxu Zhang, Mei School of Electrical and Electronic Engineering Shandong University of Technology Zibo China Electric Power Research Institute Hainan Power Grid China Southern Power Grid Company Ltd. Haikou China China Electric Power Research Institute State Key Laboratory of Operation and Control of Wind Energy & Storage Systems Beijing China

ISBN: (纸本)9798350352290

This paper proposes a maximum wind power injection (MVPI) problem under the engineering operation requirements of modern power systems and voltage stability constraints. To dig the access capacity of power grid for wind power, dynamic line rating (DLR) and optimal transmission switching (OTS) are jointly co-optimized to provide flexible operation of power systems. A novel DLR technique independent ambient parameter is proposed with the line parameter correction. The proposed problem is a mix-integer nonlinear programming problem that is hard to solve directly. Hence, a three-stage methodology is developed, which has been applied on the IEEE 24-bus RTS system, the IEEE 118-bus power system. The computational results show the effectiveness of the conducted model in maximizing the usage of wind power. © 2024 IEEE.

关键词： Windmill

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Research on Comprehensive Assessment Method of Battery Consistency Based on Scaled energy storage Power Station

Research on Comprehensive Assessment Method of Battery Consi...

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Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Kepaiyitulla Tursun Ming Li Yunping Zheng Sijia Zong Xingyan Luo Shangxing Wang Xiangjun Li Xinjiang Key Laboratory of Whole Process Simulation for Power System State Grid Xinjiang Electric Power Research Institute Urumqi China State Key Laboratory of Operation ad Control of Renewable Energy and Storage systems China Electric Power Research Istitute Beijing China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

In the long-term operation of a megawatt-scale energy storage plant composed of series-parallel connections, the single batteries will have different degrees of inconsistency problems. To solve this problem, this paper proposes a comprehensive assessment method based on the consistency of batteries in scaled energy storage power stations. According to the consistency indexes such as single battery voltage and voltage polarity difference in series connection between modules, the consistency evaluation criterion of battery monomer was established. Based on the historical data of a battery energy storage system, the consistency evaluation criterion of a single battery is used to analyze the consistency of a single battery of an energy storage power station at different charging and discharging stages. The results show that this method can accurately assess cell consistency. It provides data support for the health status assessment of energy storage plants and reduces the systematic operational risk of energy storage plants.

关键词： Electrical engineering Systematics Battery energy storage system Asia Voltage Hazards Batteries

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