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China International Electrical and energy Conference (CIEEC)

作者： Xiaotong Zhang Shiyao Qin Shaolin Li Chen Qi State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

The doubly-fed wind turbine based on grid forming control has the ability to establish terminal voltage independently and maintain stability, but the quantitative analysis of grid-connected stability and dynamic performance is insufficient, which affects the engineering application. To solve this problem, a small signal analysis model of grid forming controlled doubly-fed wind turbine is established. And based on the oscillation mode and participation factor analysis, this essay finds out the dominant modes which are influenced by grid forming control and key control parameters. Furthermore, based on the root locus analysis, the influence of grid strength and key control parameters on the stability and dynamic performance of the system is revealed as well as the variation law. Finally, the simulation model of the grid forming doubly-fed wind turbine is built in MATLAB/Simulink, and the simulation proves the accuracy and effectiveness of the theoretical analysis, which is expected to guide the popularization and application of the grid forming doubly-fed wind turbine.

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Power-balancing Coordinated control of Wind Power and Demand-side Response Under Post-fault Condition

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Journal of Modern Power systems and Clean energy 2022年第5期10卷 1207-1215页

作者： Xinshou Tian Yongning Chi Chao Liu Peng Cheng Yan Li China Electric Power Research Institute Beijing 100192China North China Electric Power University Beijing 102206China State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems(China Electric Power Research Institute) Beijing 100192China China Institute of Energy and Transportation Integrated Development North China Electric Power UniversityBeijing 102206China

As the global energy transforms to renewablebased power system, the wind power generation has experienced a rapid increase. Due to the loss of synchronous machines and its frequency control mechanisms, the gradual evolution leads to critical challenges in maintaining the frequency stability. Under post-fault condition, the wind power generation has a slow recovery due to the fault ride-through(FRT) control strategy and may cause a larger frequency deviation due to the power imbalance between the supply and demand. Then, the impacts of the frequency deviations would further cause inaccuracy and instability in the control system for wind power generation. Considering the long parking time of electric vehicles(EVs), the demand-side response is provided to support the power grid via load-to-grid technology. Thus, a power-balancing coordinated control strategy of the wind power and the demand-side response is developed. It can significantly mitigate the power imbalance, thereby resulting in the enhanced frequency stability. Finally, the simulation results are provided to validate the power-balancing coordinated control strategy.

关键词： Power-balancing wind power demand-side response frequency stability post-fault condition

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Study on Ultra-short Term Distributed Photovoltaic Power Forecasting in the Haze Day Based on All-sky Images Combined with Support Vector Regression 59

Study on Ultra-short Term Distributed Photovoltaic Power For...

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59th IEEE/IAS Industrial and Commercial Power systems Technical Conference, I and CPS 2023

作者： Zhou, Hai Wu, Ji Hu, Siyu Fan, Rui Southeast University China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems CEPRI Nanjing210003 China China Electric Power Research Institute Renewable Energy Research Center Nanjing210003 China Electric Power Research Institute State Grid Shanxi Electric Power Company Taiyuan030012 China

ISBN: (纸本)9798350396515

Due to the influence of many local random mutation factors, the ultra-short-term prediction of distributed photovoltaic power is faced with great challenges. This study is a modeling study for accurate prediction of photovoltaic power in hazy days based on all-sky image observation data. Firstly, based on the all-sky images, digital image processing technology is used to extract radiation-related image features of haze days, including image brightness, power spectrum, smoothness and mean of singular value. Secondly, the support vector regression model is established by combining image features and radiation attenuation coefficient. Finally, via determining the suitable forecasting time horizon, the surface irradiance can be forecasted based on the support vector regression model, and the photovoltaic power ultra-short-term prediction is realized using the irradiance-power convert model. The experimental results show that the ultra-short-term prediction method of photovoltaic power based on the whole sky image features and support vector regression has a good prediction effect when the optimal prediction time is determined, which provides an important practical basis for the accurate prediction of ultrashort-term power of distributed photovoltaic power stations. © 2023 IEEE.

关键词： Forecasting

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Evaluating The Aggregated Frequency Regulation Capability of energy storage Clusters 7

Evaluating The Aggregated Frequency Regulation Capability of...

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7th IEEE Conference on energy Internet and energy System Integration, EI2 2023

作者： Xiang, Jiaxiong Yang, Bo Wang, Shibo Zhang, Zhi Pei, Zheyi Li, Kecheng Zhou, Guangqi Zhou, Ming North China Electric Power University State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources Beijing China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China State Grid Shandong Electric Power Research Institute Jinan China State Grid Corporation of China Beijing China China Electric Power Research Institute Beijing China

ISBN: (纸本)9798350345094

With the integration of a large number of wind and solar new energy power generation into the power grid, the system faces frequency security issues. energy storage stations (ESS) can effectively maintain frequency stability due to their ability to quickly adjust power. Due to the differences in the state of each ESS and the topology of the power grid, it is difficult to evaluate the frequency support capability of the energy storage cluster (ESC) in real-time. This paper proposes a real-time evaluation model for the aggregated frequency support capability of ESC. The evaluation indicators for inertia support and primary frequency regulation (PFR) capability is proposed respectively. Considering the aggregation effect of ESC, the evaluation of frequency support ability for ESC is transformed into an optimization problem. This article establishes evaluation models for the inertia support capability and primary frequency regulation capability of ESC, respectively. In the evaluation model, we establish frequency response models for ESS based on virtual inertia and droop control, considering the differences in the states of each ESS and network security constraints. The case study shows that the model can evaluate the frequency support capability of energy storage clusters based on their real-time status. When considering network constraints, the supporting capacity of ESC exhibits spatial distribution characteristics. © 2023 IEEE.

关键词： energy storage

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A framework of day-ahead wind supply power forecasting by risk scenario perception

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IEEE Transactions on Sustainable energy 2025年

作者： Yang, Mao Huang, Yutong Wang, Zhao Wang, Bo Su, Xin Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Jilin132012 China China Electric Power Research Institute State Key Laboratory of Operation and Contr Ol of Renewable Energy & Storage Systems Beijing100912 China

Wind power forecasting (WPF) systems are essential to maintain the safe and stable operation of the power system in case of large-scale grid-connected wind farms. However, the current forecasting has the problem of disunity between statistical value and application value, that is, it only pays attention to its forecasting accuracy and ignores the risks caused by it in the power system. In order to solve the above problems, this study proposes a framework of wind supply power forecasting (WSPF) for wind farm cluster, which takes into account the risk scenario perception. First of all, aiming at the predicted risk phenomenon in WPF, TimesNet combined with the fluctuation information of Numerical Weather Prediction (NWP) wind speed is used to identify the corresponding risk scenarios. Secondly, the effective consumption area and power supply risk area evaluation index, as well as the accuracy of WSPF are defined, and the optimal forecasting curve correction scheme is fitted according to the index. Thirdly, taking into account the correction scheme and identification results, a variety of predictors are used to verify the WSPF according to the above framework. Finally, the proposed method is applied to a wind farm cluster in Inner Mongolia Autonomous region of China, the average accuracy of WSPF has increased by 37%, which verifies the effectiveness and universality of this method. © 2010-2012 IEEE.

关键词： Wind forecasting

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Wind power operation capacity credit assessment considering energy storage

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Global energy Interconnection 2022年第1期5卷 1-8页

作者： Wenhui Shi Jixian Qu Weisheng Wang China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy&Storage SystemsBeijing 100192P.R.China

Research on wind power capacity credit at the operational level plays an important role in power system *** the popularity of energy storage devices,it is increasingly necessary to study the impact of energy storage devices on wind power operational capacity *** definition of wind power operational capacity credit is *** available capacity model of different generators and the charging and discharging model of the energy storage are *** on the above model,the evaluation method of wind power operation credible capacity considering energy storage devices is *** influence of energy storage on the wind power operation credible capacity is obtained by case study,which is of great help for the power system dispatching operation and wind power accommodation.

关键词： Wind power operation capacity credit energy storage operation reliability

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Impedance Modeling and Characteristics Analysis of Grid-Forming Converter

Impedance Modeling and Characteristics Analysis of Grid-Form...

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

作者： Huifang Liu Yu Lei Guoqing He Keke Liu Liping Gao Junhua Ma State Key Laboratory of Operation and Control of Renewable Energy &Storage Systems China Electrical Power Research Institude School of Information Engineering China University of Geosciences Beijing China State Key Laboratory of Operation and Control of Renewable Energy &Storage Systems China Electrical Power Research Institute Beijing China

Grid-forming control (GFM) has been widely applied in academia and industry for its contribution to the stability in weak grid. As GFM has multiple control loops that interact with each other, the dominant factor of impedance characteristics in different frequency bands is still unknown. At the same time, the impact of dynamic response requirements such as bandwidth and phase margin (PM) of each control loop on GFM impedance characteristics in different frequency bands is still unclear. This article first establishes an impedance model of GFM and analyzes the transmission path of small signals in GFM. Then, based on the small signal transmission relationship, the GFM impedance is divided into two parts. One part is dominated by the synchronization loop, and the other part is dominated by the voltage and current loops. Based on this, the influence of each control loop on GFM impedance characteristics is analyzed. Finally, based on the control hardware in the loop simulation platform, experiments were conducted, verifying the correctness of the analysis in this paper.

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Mechanisms governing the evolution of a long-lived northwest vortex that caused a series of disasters in Northwest China

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Atmospheric and Oceanic Science Letters 2022年第2期15卷 19-25页

作者： Shuang-Long Jin Bo Wang Shuang-Lei Feng Xiao-Lin Liu Zong-Peng Song Ju Hu Zheng Li State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research Institute Co.Ltd.BeijingChina Electric Power Meteorology State Grid Corporation Joint Laboratory BeijingChina Northwest Branch of State Grid Corporation of China Xi’anShaanxiChina

The northwest vortex(NWV)is a type of mesoscale vortex that appears with a relatively high frequency in Northwest *** further the understanding of the NWV’s evolution,in this study,the moisture and circulation budgets of a long-lived NWV(~132 h)that appeared in early August 2019 were *** vortex induced a series of torrential rainfall events in Northwest China and Mongolia,which caused severe transmission line faults and urban *** analyses indicate that the NWV was generated in a favorable background environment characterized by notable upper-level divergence and strong mid-level warm *** moisture budget shows that the East China Sea and Bohai Sea acted as the main moisture sources for the NWV-associated precipitation,and the water vapor was transported into the rainfall regions mainly by easterly and southeasterly *** circulation budget indicates that,during the developing stage,convergence-related vertical stretching was a dominant factor for the NWV’s development;whereas,the vortex’s displacement from regions with stronger cyclonic vorticity to those with weaker cyclonic vorticity mainly decelerated its *** the decaying stage,divergence-related vertical shrinking and the net export of cyclonic vorticity due to the eddy flow’s transport resulted in the NWV’s dissipation.

关键词： Northwest vortex Torrential rainfall Transmission line faults Moistrue budget Circulation budget

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Uncertainty Analysis of Wind Power Based on Operating Data 4

Uncertainty Analysis of Wind Power Based on Operating Data

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4th International Conference on energy, Electrical and Power Engineering, CEEPE 2021

作者： Huang, YueHui Li, Pai Sun, YaNan State Key Laboratory of Operation and Control of Renewable Energy Storage Systems China Electric Power Research Institute BeiJing China

ISBN: (纸本)9781665433631

The uncertainty of wind power prediction has a serious impact on the stable operation of power system. In this paper, the actual operation data of 200 wind farms in a certain area of China are collected, and the wind farm stations are divided into different scale station clusters according to the integration location of the grid. The distribution characteristics of wind power prediction error of station clusters are analyzed. Then, based on the prediction error and power correlation characteristics, a clustering segmentation prediction error analysis method is proposed. Finally, the nonparametric kernel density estimation is used to fit the prediction error of station cluster, and the fitting precision evaluation indexes are compared to verify the applicability and effectiveness of the proposed method for the prediction error distribution of station cluster. © 2021 IEEE.

关键词： Uncertainty analysis

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Test and Assessment of Grid Forming Wind Turbine based on controller Hardware-in-the-Loop 5

Test and Assessment of Grid Forming Wind Turbine based on Co...

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5th IEEE Conference on energy Internet and energy System Integration, EI2 2021

作者： Qi, Chen Qin, Shiyao Miao, Fenglin Li, Shaolin Wang, Ruiming State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

ISBN: (纸本)9781665434256

The grid forming wind turbine technology provides a solution to the future power grid in China dominated by new energy sources. With China's first grid forming DFIG wind turbine successfully operated in Zhangbei Wind Power Test Base, the test and assessment methods should be investigated to validate and understand its behaviors. In this work, the grid forming control technique adopted in the prototype wind turbine is first introduced. Then, a high fidelity controller hardware-in-the-loop platform is constructed as an approach for testing and assessment Two capabilities of the grid forming wind turbine are mainly validated, including weak grid operation and primary frequency response. Finally, the tests are conducted in the modeled system, where the strengths and potential problems of the grid forming wind turbine are identified. This work presents a viable option for the test and assessment of the grid forming wind turbine, and is expected to help the industry to reach a consensus on its operation and characteristics. © 2021 IEEE

关键词： Wind turbines

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