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Secondary voltage control strategy of microgrid with wind power based on distributed multi-agent system 14

Secondary voltage control strategy of microgrid with wind po...

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14th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： Wang, Zhongquan Liu, Yangbo Yang, Yinguo Zhang, Peng Liu, Zejian Southern Offshore Wind Joint Development Co. Ltd. Zhuhai China Power Dispatching and Control Center of Guangdong Power Grid Co. Ltd. Guangzhou China Guangdong Key Laboratory of Clean Energy Technology South China University of Technology Guangzhou China Shenzhen Huagong Energy Technology Co. Ltd. Shenzhen China

ISBN: (纸本)9798350301359

Microgrid is an effective means to achieve flexible management and control of distributed power sources. Compared with the traditional centralized secondary control mode, the distributed coordinated secondary control strategy has higher flexibility and reliability. A secondary voltage control strategy of isolated island microgrid for distributed multi-agent system is proposed. Think of distributed power as an agent in the system, and secondary voltage control is equivalent to the tracking synchronization problem of a multi-agent system. Based on linear state feedback, a distributed controller is designed, in which the output of the state estimator is used instead of the actual state of the system, and then the event trigger controller is used to update the system state. Using a certain communication network, each agent uses the information of local and adjacent agents to coordinate with each other to ensure that the voltage of the microgrid recovers the rated value, avoiding the dependence on the centralized controller. This control strategy allows agents to exchange information only at the moment of event triggering rather than continuous exchange in real time, reducing the amount of information exchanged for data and reducing the requirements for communication networks. The island microgrid test system was used to verify the effectiveness of the proposed control strategy. © 2023 IEEE.

关键词： Distributed coordinated control Event-triggered control Microgrids with wind power Multi-agent system Secondary voltage control

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Feature identification method for abnormal operations in grid dispatch operations based on association analysis

Feature identification method for abnormal operations in gri...

引用

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

作者： Weiyuan Ma Zhihua Wang Yaqin Yan Feng Gao Kaifeng Zhang Nanyang Zhu Key Laboratory of Measurement and Control of CSE Ministry of Education Southeast University Nanjing China State Grid Shanghai Municipal Electric Power Company Shanghai China National Power Dispatching and Control Center State Grid Corporation of China Beijing China

The premise of identifying abnormal operations in power grid dispatching operations is to identity features of abnormal dispatch operations. This paper proposes a feature recognition method for abnormal operations in dispatching operations based on association analysis, laying the foundation for identifying abnormal operations. Firstly, historical operational data is preprocessed. Considering the scarcity of abnormal operations in historical data, data augmentation is performed to increase the proportion of abnormal operations. Secondly, in order to eliminate the influence of redundant information such as place names and equipment numbers in the data, clustering algorithm is used to fuzzify the operation content and operation time in the operational data. Thirdly, association analysis algorithm is used to extract compliant/abnormal features from data, and the identification of abnormal operations is accomplished using these features. The paper identifies abnormal features from the perspective of data analysis. In the case studies, we conducted feature recognition on the historical operational data of a certain dispatch automation main station in China. The obtained abnormal features include early morning, deputy director of dispatching, senior professional title, system maintenance personnel and operation of knife switch.

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Active Thermal control of grid-Forming Converters Based on DC-link Voltage Synchronization

Active Thermal Control of Grid-Forming Converters Based on D...

引用

IEEE International Conference on power and power and Renewable Energy (ICPRE)

作者： Mingqun Liu Guanming Zeng Xin He Liang Tu Peng He Yihua Zhu Electric Power Research Institute Yunnan Power Grid Co. Ltd. Kunming Yunnan State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

grid-forming control, as a key technology for building new power systems, enables inertia and damping characteristics of converters to actively support grid frequency and voltage. However, GFM-based converters are often required to generate short-circuit currents in excess of the rated value to support grid voltage recovery during transient faults, which poses a greater challenge to their electro-thermal stresses. At the same time, the over-issuance of short-circuit current will lead to the aggravation of junction temperature fluctuation, which will shorten the lifetime of the power devices and bring new challenges to their reliability. Based on the above problems, this paper firstly establishes a corresponding electrothermal coupling model for the GFM converter synchronized based on DC voltage. Subsequently, an active thermal control technique based on the adaptive adjustment of switching frequency is proposed, which can not only reduce the junction temperature of the power device under the same short-circuit current amplitude, but also further reduce the junction temperature fluctuation of the power device. Finally, the corresponding circuit as well as thermal circuit models are established by simulation software to verify the effectiveness of the strategy.

关键词： Adaptation models Fluctuations Switching frequency Short-circuit currents control systems Temperature control Junctions Transient analysis Voltage control grid forming

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Carbon Emission Calculation and Low Carbon Transition Path Optimization Method for Electric power Industry

Carbon Emission Calculation and Low Carbon Transition Path O...

引用

System Simulation Technology and its Application (CCSSTA), IEEE China Conference on

作者： Fanfan Yu Xiangyu Kong Shuai Luo Shunyu Wu Yubo Wang Yi Gao Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid Tianjin University Tianjin China Electric Power Company Economic and Technical Research Institute of State Grid Tianjin Tianjin China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

With economic development, the energy and power industry must balance power supply growth and carbon reduction requirements. To achieve the goal of“double carbon”, the power system needs to be transformed into green and low-carbon, and accurate carbon emission accounting has become a critical support. Due to the significant differences between cities and regions, emission reduction strategies vary. To this end, the article firstly clarifies the carbon emission accounting boundary of power generation enterprises, establishes a carbon emission accounting model for the power industry based on the IPCC inventory method of fuel consumption, and secondly constructs an enterprise low-carbon transition planning model by integrating technological, economic, environmental and other factors, researches and analyzes the path of power generation enterprises to achieve carbon-neutral transition by 2060, and simulates different low-carbon transition scenarios. The results show that achieving carbon neutrality appropriately in advance is beneficial to power generation enterprises to a certain extent, but advancing the process of carbon neutrality too early will lead to soaringcosts. In addition,future policies will push forward the scale of installed energy storage, and enterprises should make good use of technical and resource reserves. The power industry needs to formulate appropriate low-carbon transformation strategies according to its reality to ensure that it realize a win-win situation regarding economic and social benefits while realizing the goal of carbon neutrality.

关键词： Analytical models Costs Green products Carbon neutral Market research power industry Planning Fuels power generation Energy storage

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Distributed power Restoration Method Based on Joint control of DGs

Distributed Power Restoration Method Based on Joint Control ...

引用

International Conference on power System Technology (powerCON)

作者： Ruimei Wang Wei Cong Yi Tang Anning Wang Yongjie Zhang Qianshuo Gu Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China State Grid Shandong Electric Power Company Jinan China

As the scale of power system continues to expand, the proportion of distributed generators (DGs) in the smart distribution network has been increasing year by year. To address the problem of power restoration after DGs access, distributed power restoration method based on joint control of photovoltaic unit and pv/battery unit is proposed. Analyzing the control modes of photovoltaic unit and pv/battery unit during distributed power restoration, available capacity and adjustment range are determined based on control principles and operation constraints. Based on this method, the network is gradually converted into Thevenin equivalent circuit, and power restoration calculations are performed while considering the operating characteristics of photovoltaic unit and pv/battery unit. At the same time, power output adjustment is carried out based on voltage and frequency constraints to avoid overvoltage or frequency problems during the power restoration process. Using IEEE 33-node system as an example, then the feasibility of this method is verified.

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Design of Trading Adjustment Mechanism for Energy Storage in Electricity Market Based on Equivalent Net Load Fluctuation

Design of Trading Adjustment Mechanism for Energy Storage in...

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Energy, Electrical and power Engineering (CEEPE), International Conference on

作者： Shihang Song Li Zhang Zhiqiang Qi Haibo Wang Yuxi Wang Xinyan Su Guanting Chen Fukun Wang Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China State Grid Shandong Electric Power Company Jinan China

As the proportion of renewable energy connected to grid increases continuously, the volatility and uncertainty of its output affect the safe operation of the power system, so it is necessary to adjust the trading mechanism of electricity market. As a high-quality flexible resource, energy storage becomes an important means to deal with the challenge caused by renewable energy. How to improve the mechanism of electricity market to better play the role of energy storage is worthy of in-depth research. This paper proposes a trading adjustment mechanism for energy storage in electricity market based on the fluctuation degree of equivalent net load, and establishes a joint market model of energy market and frequency regulation market including storage power station. The example simulation shows that the trading adjustment mechanism proposed in this paper can effectively enhance the role of energy storage, and has a good effect on improving the fluctuation degree of net load and reducing system operating costs.

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Load Flexibility Evaluation Method for Industrial Parks Based on SPA and TOPSIS

Load Flexibility Evaluation Method for Industrial Parks Base...

引用

System Simulation Technology and its Application (CCSSTA), IEEE China Conference on

作者： Yubo Wang Xiangyu Kong Yang Wang Haixuan Zhang Shunyu Wu Shuai Luo Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid Tianjin University Tianjin China State Grid Tianjin Electric Power Company Tianjin China State Grid Tianjin Electric Power Company Economic and Technological Research Institute Tianjin China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

With the requirement for an increased share of renewable energy, park load flexibility is needed to balance fluctuations between supply and demand. The factors affecting the load flexibility of the park are analyzed from four dimensions: high quality, high efficiency, security, and low carbon. The index system for evaluating the load flexibility of the park is constructed. Given the relevance of the load flexibility assessment indexes of the park, the grey entropy algorithm is improved, and the combined assignment method is proposed to enhance the assignment of the indexes’ weights. The quantitative assessment method of park flexibility is proposed based on the coupling of SPA (Set Pair Analysis) and TOPSIS (Technique for Order Preference by Similarity to Ideal Solution). The simulation shows that this method can solve the shortcomings of traditional TOPSIS well and make the quantitative assessment results of park load flexibility more accurate, which can be a guide for evaluating the flexibility of other urban industrial parks.

关键词： Couplings Technological innovation Supply and demand Green products Systems simulation Indexes Security Carbon Sustainable development Load modeling

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Transient Voltage Analysis for Hybrid grid-Following and grid-Forming Converters

Transient Voltage Analysis for Hybrid Grid-Following and Gri...

引用

IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Xindi Liu Shanshan Qiu Changhui Ma Xing Lei Xinyu Wei Changgang Li Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Shandong Electric Power Research Institute Shandong Smart Grid Technology Innovation Center Jinan China State Grid Shanghai Municipal Electric Power Company Shanghai China

ISBN: (数字)9798331517540

ISBN: (纸本)9798331517557

With the integration of power electronic devices, the dynamic characteristics of power system have become increasingly complex. Renewable energy units are integrated into the grid through grid-following (GFL) and grid-forming (GFM) converters. In order to reveal the impact of hybrid GFL and GFM converters on transient voltage in renewable energy base, this paper analyzes the terminal voltage characteristics. Firstly, this paper simplifies the renewable energy base and proposes a formula for calculating terminal voltage. Next, this paper analyzes the impact of GFL converter parameters, GFM converter parameters, and the capacity ratio of GFL to GFM converters on terminal voltage. Then, we propose a calculation formula for the capacity configuration ratio of GFM converters in renewable energy bases. Finally, the theoretical analysis in this paper is verified.

关键词： Electrical engineering Renewable energy sources grid following power system dynamics Voltage power electronics Topology Transient analysis Voltage control grid forming

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Optimal Economic Dispatch Strategy for Microgrids Considering Distributed Energy Storage Aggregation

Optimal Economic Dispatch Strategy for Microgrids Considerin...

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IEEE Student Conference on Electric Machines and Systems

作者： Changtao Kan Xin Luo Shuang Liang State Grid Jinan Power Supply Company Jinan China State Grid Shandong Electric Power Company Maintenance Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9798350366945

ISBN: (纸本)9798350366952

User-side distributed energy storage, as a flexible demand response resource, possesses excellent source-load interaction characteristics and can effectively interact with the power grid. However, currently in China, user-side distributed energy storage resources often face difficulties in directly participating in grid regulation due to factors such as dispersed geographical distribution, small individual installed capacity, and uncertain output time. To address this issue, this paper proposes an optimal economic dispatch strategy for microgrids that considers distributed energy storage aggregation. First, a distributed energy storage aggregator is introduced to manage scattered user-side distributed energy storage resources in a scaled manner, and the scheduling potential of distributed energy storage in each time period is assessed based on consumer psychology theory. Subsequently, a multi-objective optimal dispatch model for microgrids is constructed, which takes into account both economic and environmental aspects. The multi-objective optimization problem is transformed into a single-objective optimization problem using the weighted assignment method, and the CPLEX solver is employed to solve the problem. Finally, the effectiveness and feasibility of the proposed method in this paper are verified through a microgrid test system.

关键词： Economics Electric machines Psychology Microgrids Regulation Demand response Optimization Faces Energy storage

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Coordinated control of frequency restoration of wind power interconnected power system based on distributed model prediction 14

Coordinated control of frequency restoration of wind power i...

引用

14th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： Lin, Xu Lu, Qiuyu Zhang, Peng Liu, Zejian Liu, Yangbo Power Dispatching and Control Center of Guangdong Power Grid Co. Ltd. Guangzhou China Guangdong Key Laboratory of Clean Energy Technology South China University of Technology Guangzhou China Shenzhen Huagong Energy Technology Co. Ltd. Shenzhen China Southern Offshore Wind Joint Development Co. Ltd. Zhuhai China

ISBN: (纸本)9798350301359

In view of frequency deviation, the existing frequency recovery control methods mainly have two shortcomings. The first disadvantage is that the control strategy within the wind farm is not designed to avoid the occurrence of secondary frequency dips. Aiming at the unsafe dynamic process frequency deviation, a dynamic process frequency recovery control strategy is proposed. Firstly, the predictive control theory and fuzzy theory of distributed models are introduced. Then, each area of the wind power interconnected power system is modeled to further obtain the model of the entire interconnected power system. Subsequently, the frequency recovery control strategy of the system is designed based on the distributed model predictive control. Finally, the effectiveness and superiority of the proposed control strategy are verified in the improved IEEE four-machine two-area system and the improved IEEE 10-machine 39-node system. © 2023 IEEE.

关键词： Coordinated control frequency deviation fuzzy theory model predictive control wind power interconnected power system

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