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58th IEEE/IAS Industrial and Commercial power systems Technical Conference Asia (IEEE I and CPS Asia)

作者： Pan, Zhiyuan Liu, Chaonan Liu, Jing Cui, Xiyou Zhang, Changhang Yang, Ming State Grid China Technol Coll Jinan Peoples R China Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (数字)9781665450669

ISBN: (纸本)9781665450669

Wind power has undergone rapid development in China. Currently, wind power is gradually regarded as a regular generation source to participate in the electricity market. However, in the current Chinese electricity market, wind power has not fully participated in the market competition. For wind power producers (WPPs), the government subsidies and marketization coexist. Besides, the uncertain nature of wind power will result in revenue losses to WPPs due to the deviation penalty policy (DPP). This paper explores the profits difference caused by various market participation methods and DPP. The settlement process for WPP under different market participation methods and deviation mechanism is modeled, which is built based on dayahead and real-time two-stages market. An illustrative example is proposed to analyze the best market participation method under various market situations.

关键词： wind power electricity market market participation methods deviation penalty policy

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Cyber-Attack Risk Assessment and Prevention Strategy of Substations Based on Dynamic Attack and Defense Game 3

Cyber-Attack Risk Assessment and Prevention Strategy of Subs...

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3rd power system and Green Energy Conference, PSGEC 2023

作者： Lin, Feng Mei, Yong Zhu, Yihua Chang, Dongxu Liu, Ren Guo, Hengdao China Southern Power Grid Power Dispatch and Control Center GuangZhou China Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc GuangZhou China Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&d Centre GuangZhou China China Southern Power Grid Csg Key Laboratory for Power System Simulation GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation Control for New Energy Power System GuangZhou China

ISBN: (纸本)9798350340099

With the improvement of the informatization of the power system, the risk of cyber attack is also increasing. This paper proposes a risk assessment and prevention strategy for cyber attack against substations. Firstly, the cyber attack against substations are modeled based on the game theory of dynamic attack and defense. Secondly, an improved OPA (ORNL-PSERC-Alaska) model is utilized to analyze the cascade failure after cyber attacks and quantify the load loss of power system. Finally, a preventive strategy which can mitigate the expectation load loss caused by cyber attack against substations is put forward. Simulation experiments were conducted to validate the effectiveness of the proposed method. © 2023 IEEE.

关键词： Risk assessment

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Transient Overvoltage Analysis in Large-Scale Wind power Sending End systems with Grid-Following and Grid-Forming Converters

Transient Overvoltage Analysis in Large-Scale Wind Power Sen...

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

作者： Jiawen Cao Xindi Liu Dongbao Lv Changgang Li Shanshan Wang Jingya Jiang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China China Electric Power Research Institute Beijing China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

As China pursues its "carbon peak" and "carbon neutrality" goals, the rapid growth of renewable energy has raised concerns about grid stability due to transient overvoltage. The overvoltage can exceed protective settings, leading to disconnections of renewable sources. This paper investigates the mechanisms behind transient overvoltage in a large-scale radial wind power integration system following a three-phase short-circuit fault. By modeling a large-scale wind power sending end system with both grid-following (GFL) and grid-forming (GFM) converters, the study analyzes turbine dynamics and quantifies transient overvoltage. The research also examines the factors influencing overvoltage, providing a theoretical foundation for overvoltage protection in wind power systems.

关键词： Renewable energy sources Analytical models Grid following Wind power generation power system stability Stability analysis Wind turbines Voltage control Transient analysis Grid forming

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A Transient Voltage Stability Preventive control Strategy for DC Receiving-end power system 8

A Transient Voltage Stability Preventive Control Strategy fo...

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8th International Conference on power and Renewable Energy, ICPRE 2023

作者： Tu, Lian Zhang, Shuiping Guo, Hengdao Bao, Bo Zhu, Yihua Zuo, Jian Power Dispatch and Control Center of Guangdong Power Grid Co. Ltd China Southern Power Grid 510000 China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid 510663 China National Energy Power Grid Technology R&D Centre 510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System 510663 China

ISBN: (纸本)9798350328813

With the increase of DC feed power and the decrease of the number of synchronous machines, receiving-end power system takes a serious threat to the transient voltage stability. Therefore, a transient voltage stability preventive control strategy for DC receiving-end power system is proposed in this paper. The whole method is decomposed into three sub-problems: transient voltage stability assessment, sensitivity computation and optimal control. A transient voltage stability index suitable for the sensitivity method is used to construct the transient voltage stability constraints. The accuracy and efficiency of the solution algorithm are improved by limiting the effective control interval of sensitivity and selection of the initial control set. The method has been applied in a provincial power grid in southern China. The results verifies the effectiveness of the proposed method. © 2023 IEEE.

关键词： DC receiving-end power system preventive control sensitivity transient voltage stability

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A Multi-dimensional Copula Wind Speed Correction Method for Ultra-Short-Term Wind power Prediction 4

A Multi-dimensional Copula Wind Speed Correction Method for ...

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4th Asia Energy and Electrical Engineering Symposium (AEEES)

作者： Wang, Chuanqi Yang, Ming Yu, Yixiao Li, Menglin Si, Zhiyuan Liu, Yating Yan, Fangqing Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China State Grid Shandong Elect Power Co Laiwu Elect Power Supply Co Jinan Peoples R China

ISBN: (纸本)9781665479141

The focus of this paper is how to make comprehensive use of numerical weather prediction (NWP) and real power data to correct the forecasted wind speed, to improve the accuracy of ultra-short-term wind power prediction. Firstly, the multi-dimensional Copula model is built by 3 time series: current wind speed, previous wind speed error and current wind speed error. Determinate the first two values, and the current wind speed error can be obtained by gradually solving the conditional probability. Then, use the current wind speed error to correct and replace forecasted wind speed in NWP. Finally, take corrected NWP as the input of Long Short-Term Memory (LSTM), and take real power as the output. After selecting appropriate parameters to train the LSTM model, this hybrid model can be used to predict the ultra-short-term wind power. Compared with Autoregressive Integrated Moving Average (ARIMA), which only considers the time-series characteristics of wind speed error, this hybrid model can bring 2.3% reduction of mean absolute percentage error in prediction.

关键词： NWP ultra-short-term wind power prediction error correction multi-dimensional Copula LSTM

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A power supply restoration method of distribution network based on NSGA-II algorithm 3

A power supply restoration method of distribution network ba...

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3rd International Academic Exchange Conference on Science and Technology Innovation, IAECST 2021

作者： Zhou, Fengyuan Gao, Zhanjun Mu, Jinshuang Zong, Peng Ministry of Education Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China

ISBN: (纸本)9781665402675

With the rapid development of today's economy and society, people put forward higher requirements for power quality. In the process of distribution network operation, if there is a fault, it will produce immeasurable loss. It is necessary to restore the power supply in the non-fault power outage area in time. Therefore, it is particularly important to restore the power supply of distribution network quickly and efficiently. This paper considers factors such as load recovery, switching operation times and network loss. Based on the mathematical model of distribution network restoration and reconstruction, a genetic algorithm for distribution network power supply restoration and reconstruction is proposed. Combined with the characteristics of distribution network, the crossover rate and mutation rate suitable for distribution network are selected to improve the efficiency of the algorithm and make it quickly converge to the global optimal solution. Finally, the feasibility of distribution network is verified by an example. © 2021 IEEE.

关键词： Genetic algorithms

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Adaptive Internal Time-Step Adjustment of Elementary Transfer Function Blocks for Trapezoidal Integration in power system Dynamic Simulations

Adaptive Internal Time-Step Adjustment of Elementary Transfe...

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International Conference on power system Technology (powerCON)

作者： Yun Hang Changgang Li Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan Shandong China

With the development of renewable energy sources, the scale and complexity of power systems are continuously increasing, resulting in a high requirement for the efficiency of dynamic simulation. To enhance the overall simulation speed, this paper proposes an adaptive internal time-step adjustment method of elementary transfer function blocks for Trapezoidal integration in power system dynamic simulations. For blocks with different time constants, three integration modes are defined, including single-step integration, multiple-step integration, and static approximation. Each block can select an appropriate integration mode and adaptively adjust its internal time-step. Implementation of static approximation for blocks with small time constants is given. The proposed method is applied to the open-source Simulation Toolkit for Electrical power systems (STEPS). The IEEE 9-bus test system is tested to obtain the maximum simulation time-step that can maintain numerical stability and validate the efficiency of the proposed method.

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Cascading Failures Assessment with High Penetration of DFIG Based Wind Turbines

Cascading Failures Assessment with High Penetration of DFIG ...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Liu, Tianhao Zhu, Yuanzhen Sun, Runjia Liu, Yutian Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (纸本)9781665414395

An assessment method of cascading failure is proposed to acquire high-risk cascading failures chains under high penetration of renewable energy power system. At first, a dynamic simulation model considering the controller of DFIG is established, and the simplified LVRT model is proposed for the DFIG response model. Then, a risk index is defined for the depth first tree search method used in searching proceeding. Finally, a searching method for cascading failure based on dynamic simulation and power flow is presented, which can simulate the interactive between DFIG and grid failure. The effectiveness of the method proposed to search high-risk cascading failures chains under high penetration of renewable energy is verified by the simulations concerning the modified New England test system. © 2021 IEEE.

关键词： Electric load flow

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Adaptive Weighted Combination Approach for Wind power Forecast Based on Deep Deterministic Policy Gradient Method

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IEEE TRANSACTIONS ON power systemS 2024年第2期39卷 3075-3087页

作者： Li, Menglin Yang, Ming Yu, Yixiao Shahidehpour, Mohammad Wen, Fushuan Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China IIT Galvin Ctr Elect Innovat Chicago IL 60616 USA King Abdulaziz Univ ECE Dept Jeddah 21589 Saudi Arabia Zhejiang Univ Hainan Inst Sanya 572000 Peoples R China Zhejiang Univ Sch Elect Engn Hangzhou 310027 Peoples R China

Accurate wind power forecast (WPF) is critical for ensuring secure and economic operation of a power system, and combination forecasting approaches for WPF have been proved effective on attaining accurate forecasting results. However, the weights in a combination forecasting model are usually predetermined based on the global performance on the training set, limiting the adaptability of the model to different scenarios. To further enhance the accuracy and effectiveness of the combination forecasting approaches, this article proposes an adaptive weighted combination forecasting approach based on the deep deterministic policy gradient (DDPG) so as to consider the local behavior accompanied by the change of external environment. Three sub-models are first selected considering the equal-likelihood and dispersion indices to construct a combination model. Then, the DDPG agent is trained to act as a weight generator by interacting with the environment and to maximize the reward. Thus, the DDPG agent can perceive the environmental changes online and dynamically weight the sub-models to attain accurate forecasting results. Case studies demonstrate that the forecasting accuracy of the proposed approach is better than that of all sub-models and several benchmark combination forecasting approaches.

关键词： Wind power forecasting combination forecast adaptive weights deep deterministic policy gradient

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A Grid-Load-Storage Coordinated Planning Model Considering Flexibility Resources under High Wind power Penetration

A Grid-Load-Storage Coordinated Planning Model Considering F...

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2021 IEEE International Conference on Electrical Engineering and Mechatronics Technology, ICEEMT 2021

作者： Liu, Shuai Wang, Mingqiang Hu, Yuxi Lian, Xiaoyang Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (纸本)9781665441285

With the increasing penetration of renewable energy, the fluctuation of renewable energy source (RES) is one of the most important factors that affect the reliability and economy of power system. It is crucial to consider the flexibility and reliability in planning stage. In this paper, a grid-load-storage coordinated planning model considering unit commitment (UC) constraints is proposed, in which the candidate transmission lines and energy storage systems (ESSs) are simultaneously planned by minimizing the investment cost, operation cost, flexibility cost and wind and load curtailment cost. The flexibility resources are provided by generators, ESSs and demand response (DR) together. In order to ensure the reliability of this model, N-1 security criterion is also considered. To validate the effectiveness and superiority, the proposed model is illustrated using the IEEE-RTS system. © 2021 IEEE.

关键词： Reliability

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