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

作者： Ke Wang Wenping Qin Yu Zhang Zhilong Zhu Shaokai Xue Xiang Jing Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

At present, China is the only country among the world's major economies where carbon emissions continue to grow, and the construction of a new power system with new energy sources as the mainstay is an important path to achieve carbon neutral. With the large scale of doubly-fed induction generators access to the grid, the stability characteristics of system power angle become more complex. On the background of DFIG access to a two-area interconnected system, a model is firstly designed for the system according to the area center of inertia theory and the influence of DFIG virtual inertia on the rotor motion equations of synchronous machines in two regions is analyzed. Secondly, the influence of the inertia control scale factor of DFIG on system power angle velocity during system acceleration and deceleration phase is studied when a three-phase short circuit fault occurs and then the mechanism analysis of the first swing stability of system power angle is investigated. Finally, the system power angle stability is evaluated by the maximum deviation of system power angle and a two-area interconnected system is modeled in PSASP to verify the proposed theory.

关键词： Doubly fed induction generators Interconnected systems Carbon dioxide system integration power system stability Stability analysis Mathematical models

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Comprehensive situation assessment method of the regional distribution network considering massive renewable energy access

Comprehensive situation assessment method of the regional di...

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Electrical Engineering and control Technologies (CEECT), Conference on

作者： Jie Liu Yujian Dai Longwen Fan Qingsheng Zhao Dingkang Liang North China Power Engineering Co. Ltd. of China Power Engineering Consulting Group Peaking China Shanxi Key Lalobratory of Power System Operation and Control Taiyuan University of Technology Shanxi China Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Shanxi China

To effectively perceive the comprehensive situation of the regional distribution network with massive renewable resources, an evaluation approach based on trapezoidal fuzzy numbers and measurement of alternatives and ranking according to compromise solution (MARCOS) is proposed. First, the comprehensive situation evaluation index system of the regional distribution network is constructed, which involves four aspects: security situation, economic situation, low-carbon situation, and regulation situation. Then, the trapezoidal fuzzy number is used to express and analyze the semantic evaluation information of qualitative indicators, and the evaluation information is fused based on fuzzy theory to reduce the impact of uncertainties on the comprehensive situation evaluation results of the distribution network. Further, the trapezoidal fuzzy MARCOS method is used to process the decision-making information, thereby obtaining the final evaluation result. Finally, taking Taiyuan City as an example, the proposed method is used to evaluate and analyze the comprehensive situation of the regional distribution networks within the jurisdiction of the city, and the feasibility and effectiveness of the proposed method are verified by combining with the realities.

关键词： Renewable energy sources Uncertainty Urban areas Decision making Semantics Distribution networks Regulation

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Network-Constrained Unit Commitment with Flexible Temporal Resolution

arXiv

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arXiv 2024年

作者： Yu, Zekuan Zhong, Haiwang Ruan, Guangchun Yan, Xinfei The State Key Laboratory of Power System Operation and Control Dept. of Electrical Engineering Tsinghua University Beijing China The Sichuan Energy Internet Research Institute Tsinghua University China The Lab for Information & Decision Systems Massachusetts Institute of Technology Massachusetts United States

Modern network-constrained unit commitment (NCUC) bears a heavy computational burden due to the ever-growing model scale. This situation becomes more challenging when detailed operational characteristics, complicated constraints, and multiple objectives are considered. We propose a novel simplification method to determine the flexible temporal resolution for acceleration and near-optimal solutions. The flexible temporal resolution is determined by analyzing the impact on generators in each adaptive time period with awareness of congestion effects. Additionally, multiple improvements are employed on the existing NCUC model compatible with flexible temporal resolution to reduce the number of integer variables while preserving the original features. A case study using the IEEE 118-bus and the Polish 2736-bus systems verifies that the proposed method achieves substantial acceleration with low cost variation and high accuracy. Copyright © 2024, The Authors. All rights reserved.

关键词： Energy management

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Research on primary frequency regulation of grid integrated concentrating solar power plant 9

Research on primary frequency regulation of grid integrated ...

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9th China International Conference on Electricity Distribution, CICED 2021

作者： Qian, Minhui Zhao, Dawei Zhao, Liang Zhu, Lingzhi Wu, Fubao Chen, Ning Qin, Wenping Xu, Chang Jiangsu Eng. Technol. Res. Ctr. for Ener. Storage Conversion and Applic. China Elec. Pwr. Res. Inst. State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Nanjing China Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China College of Energy and Electrical Engineering Hohai University Nanjing China

ISBN: (纸本)9781728192291

High share of renewable energy will be one of the basic features of power systems in the future around the world. Compared with photovoltaic (PV) and wind power, concentrating solar power (CSP) equipped with heat storage system has similar regulation characteristics with thermal power units, and it can effectively overcome the intermittent and volatility of PV and wind power generation. Meanwhile, the CSP units can strongly support the voltage, frequency and short-circuit capacity of power systems. So, CSP is a very promising power generation technology for the future power system. The CSP unit has better ramp ability than thermal power unit, and can generally reach a speed between 2% and 5% of rated power per minute. Stated thus, the CSP unit has a good potential to participate in the primary frequency regulation of power grid. At present, there are many researches on the performance of each subsystem of the CSP unit in worldwide, and there are also some theoretical researches on the participation of CSP unit in the dispatching operation of power system. However, there is a lack of research reports on CSP plant's participation in the primary frequency regulation of the power grid, which is an urgently needed feature for the future power systems with high share of renewable energy. In this paper, a model with primary frequency regulation ability of CSP unit is established in DIgSILENT powerFactory software. A revised two-area four-machine system is used to investigate the CSP unit's participation in primary frequency regulation of power system. The simulation results show the good frequency regulation performance of CSP unit, which can effectively support the stable operation of power system with high share of renewable energy in the future. © 2021 IEEE.

关键词： Concentrated solar power

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Commutation Fault Identification of UHVDC Transmission system Based on Dissipated Energy

Commutation Fault Identification of UHVDC Transmission Syste...

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IEEE/IAS Industrial and Commercial power system Asia (I&CPS Asia)

作者： Weiming Zhang Shuai Yuan Gong Cheng Qingsheng Zhao Dingkang Liang Minhong Yuan Shanxi Key Laboratory of Power System Operation and Control College of Taiyuan University of Technology Taiyuan China State Grid UHV Transmission CO.OF SEPC State Grid Power Supply Company Taiyuan China State Grid UHV Transformation CO.OF SEPC State Grid Power Supply Company Taiyuan China State Grid Power Supply Company Taiyuan China

Commutation failure is a common fault in UHVDC transmission systems that use grid commutation converters. If commutation failure occurs, it will cause DC power fluctuations and perhaps a DC lockout, endangering the grid's ability to function safely and steadily. Therefore, it is critical to correctly and promptly diagnose the failure and implement the necessary controls to prevent commutation failure from happening in the later stage. This paper first uses MATlab/SIMULINK to build the simulation model of UHVDC transmission system, and then the different types of faults on the inverter side commutation bus are simulated. To determine the faulty type of commutation failure, this paper proposes a commutation failure identification method of UHVDC transmission system based on dissipated energy, the outcomes demonstrate that this method is cable of correctly determine the commutation failure type brought on by a commutation bus fault.

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control Strategy of Hybrid Energy Storage in Large-Scale Wind Farm

Control Strategy of Hybrid Energy Storage in Large-Scale Win...

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

作者： Liang Huang Hao Chen Yanbing Jia Feng Tian Yun Bai Mengdie Li Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China State Grid Shanxi Electric Power Company Taiyuan Power Supply Company Taiyuan China Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

The large-scale access of renewable energy sources such as wind power will affect the operation and dispatch of the power system, and will affect the safe and stable of the power grid. The ESS has the ability to respond quickly, which can reduce the impact of wind power on the grid. Based on a hybrid energy storage with a certain capacity, a corresponding rolling optimization control strategy is proposed. Using batteries and super capacitor as energy storage media, an optimal control model targeting the state of charge of the hybrid energy storage system is established, and the solution is solved by a particle swarm optimization algorithm. The simulation example shows that a HESS with a certain capacity on the generation side can achieve a smooth grid connection. The control strategy proposed in this paper extends the service life of the battery.

关键词： Renewable energy sources power supplies Capacitors Optimal control system integration Wind power generation Wind farms

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Research on Protection Method of Medium Voltage DC Distribution Network

Research on Protection Method of Medium Voltage DC Distribut...

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

作者： Shengwen Li Jinhao Wang Xiaoqian Chen Wenping Qin Yizhao Liu Zhongjie Wang Yang Yang Yong Ren Power Grid Technology Center Electric Power Research Institute of State Grid Shanxi Electric Power Company Taiyuan China Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

DC line protection is a key issue in the development of DC distribution networks. The biggest challenge is to identify fault sections quickly and reliably. In order to ensure the reliable operation of the DC grid, this paper takes a typical four-port ring medium voltage distribution network as an example to propose a DC protection network fault protection strategy based on DC inductors. Since the parameters involved in this criterion are all implemented by local measurements, it has the characteristics of real-time communication independent of off-site signals. The MMC-based four-port DC distribution network was modelled using a real-time digital simulator (RTDS), and a number of simulation experiments were performed to verify the effectiveness of the proposed protection scheme. The simulation results show that the proposed protection method not only can detect faults quickly and accurately, but also has a certain effect on detecting high-impedance faults.

关键词： Fault diagnosis Simulation Fault protection Distribution networks Medium voltage system integration Real-time systems

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Low-carbon Economic Dispatch of Integrated Energy system Considering Hydrogen Mixing in Natural Gas Pipeline

Low-carbon Economic Dispatch of Integrated Energy System Con...

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

作者： Dong Xie Lihong Kang Yanbinz Jia Hao Chen Feng Tian Yun Bai Baifu Zhang Xuan Cui State Grid Shaoxing Power Supply Company Shaoxing China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China State Grid Shanxi Electric Power Company Taiyuan Power Supply Company Taiyuan China

ISBN: (纸本)9781665434263

With the rapid growth of the penetration rate of renewable energy, the construction of Integrated electricity-natural gas system (IEGS) has important economic and environmental significance. power-to-gas (P2G) technology, as a new energy conversion and storage method, provides an important way for wind power consumption. Due to the limited local consumption of hydrogen energy and difficulty in exporting, this paper proposes an IEGS optimal scheduling model that considers hydrogen mixing in natural gas pipeline and aims at the lowest system operating cost. After the verification of the improved IEEE 14-node power network and the Belgian 20-node natural gas network coupling system, the operation mode of the IEGS proposed in this paper can expand the hydrogen demand, increase the hydrogen transmission capacity, and promote wind power consumption. At the same time, it can achieve carbon emission reduction and improve the economics of system operation.

关键词： Renewable energy sources systems operation Hydrogen Pipelines Energy conversion Carbon dioxide system integration

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Comprehensive Evaluation of AC-DC Distribution Network in Photovoltaic-Energy Storage Charging Station Based on AHP-TOPSIS Method

Comprehensive Evaluation of AC-DC Distribution Network in Ph...

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

作者： Xinfang Zhang Hao Li Lei Wang Yizhao Liu Fangda Wang Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Hebei Gas Co. Ltd Taiyuan China Electric Power Research Institute Taiyuan China

ISBN: (纸本)9781665434263

Increasing studies have shown that DC distributi on will contribute substantially to future photovoltaic-energy st orage charging station (PV-ES CS) owing to the high efficiency and play an important role in distribution networks. It is neces sary to comprehensively compare low voltage DC (LVDC) with AC (LVAC) distribution networks for planning and design of PV-ES CS. This paper presents a comprehensive evaluation mo del of the distribution system based on AHP-TOPSIS theory. The evaluation index system, including reliability, economy and adaptability, is proposed based on the difference of AC and DC distribution network structure and performance. The propose d approach integrates ideal solution (TOPSIS) and Analytic hie rarchy process (AHP) to determine the weights. Finally, the re sults obtained from the case studies have demonstrated the rati onality and feasibility of proposed evaluation model. It is instru ctive to the application and popularization of DC PV-ES CS.

关键词： Photovoltaic systems power distribution Distribution networks system integration Charging stations Optical fiber networks Reliability theory

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Study on Wind Speed Model Considering Flow Around the Tower and Its Impact on Output power of Wind Turbine

Study on Wind Speed Model Considering Flow Around the Tower ...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Chang, Xiao Li, Huipeng An, Qi Liu, Yizhao Li, Shengwen Wang, Hao Taiyuan University of Technology State Grid Shanxi Electric Power Research Institute Shanxi Key Lab of Power System Operation and Control Taiyuan China Taiyuan University of Technology State Grid Jinzhong Power Supply Company Shanxi Key Lab of Power System Operation and Control Jinzhong China

ISBN: (纸本)9781728149301

A downstream wind turbine experiences a decrease in power output due to wind speed weakening caused by the shelter of tower. In order to calculate the effect on WTG's output power quantitatively caused by the shelter of tower, a wind speed variation model of tower is proposed. The presented model is used to evaluate the effect of the flow around the tower on WTG's output power, which takes into account the wake effect, mountain terrain and random wind direction. The output power of wind turbines is calculated by using simulation method with considering the flow around the tower effect. Results are compared with the actual monitoring data of a wind farm in shanxi, and it shows that the influence of flow around the tower on WTG cannot be ignored in some specific conditions. Therefore, the research can provide theoretical guidance for micro site selection of wind turbine, which means that it's necessary to evaluate the influence of the flow around the tower on power output model of WTG. © 2019 IEEE.

关键词： Wind turbines

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