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10th Renewable power Generation Conference, RPG 2021

作者： Fan, Huijing Qiu, Gang Guo, Xiaolong Zhen, Zhao Wang, Fei Mi, Zengqiang Wang, Ge Department of Electrical Engineering North China Electric Power University Baoding071003 China Dispatch and Control Center State Grid Xinjiang Electric Power Co. Ltd Urumqi830018 China State Key Lab of Power System Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781839536069

Although the current use of probabilistic prediction in power system is limited, some researches on wind power probabilistic forecast have appeared to promote the adoption of probabilistic forecasts. There are some problems, such as the width of prediction interval (PI) remains unchanged regardless of the fluctuation of wind speed. Therefore, this paper proposes a novel probabilistic forecast method based on the correlation between wind process fluctuation patterns and prediction errors, using a regularized extreme learning machine (RELM) approach. It is observed that the point prediction error corresponding to the large fluctuation wind process is usually larger than that of the gentle wind process. By clustering the wind processes into four categories to identify different fluctuation degrees, PIs are established for different categories respectively, and a probabilistic forecast result that the width of PIs changes with the fluctuation of wind speed curves is obtained. Through the comparison of the prediction interval width under the same confidence level, it is concluded that the model based on wind pattern recognition can improve the prediction reliability on the premise of ensuring the sharpness of the prediction results. © The Institution of Engineering and Technology.

关键词： Wind power

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Performance of a siphon-like water supplying solar distiller with helium gas enhancing the reverse film evaporation process

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Desalination 2023年第1期564卷

作者： Yuan, Xi Zheng, Hongfei Wang, Ge Zhao, Yunsheng Kong, Hui School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China School of Physics and Electronics Nanning Normal University Nanning530021 China State Key Laboratory of Power System Operation and Control Department of Thermal Engineering Tsinghua-BP Clean Energy Center Tsinghua University Beijing100084 China

The multistage solar desalination method based on the interface local thermal method is an attractive and efficient desalination method. However, there are still problems such as the upward diffusion of water vapor in the air and the downward irradiation of solar light, which make the multistage device fail to effectively condense and interface salt crystallization cannot be effectively eliminated, hindering the development of large-scale and sustainable applications of this technology. Here, we use a cheap nanofiber super-hydrophilic material to promote the flow of seawater at the interface and promote the discharge of salt crystallization under the siphon-like effect. At the same time, the water vapor‑helium space is constructed by filling helium to promote the downward diffusion of water vapor in the space and solve the problem of insufficient multistage condensation. In this work, a two-stage and three-stage reverse mass transfer solar seawater desalination system with solar hot film evaporation was built, and the corresponding theoretical calculation and experimental verification were carried out. The experimental results show that under sunlight irradiation of 800 W m−2, the three-stage experimental system filled with helium can effectively enhance the condensation of water so that the GOR value of the system vapor is 1.54, the first-stage evaporation efficiency reaches 67.9 %, and the water productivity reaches 1.85 kgm−2h−1. In this study, injecting low molecular weight gas to achieve efficient condensation of the system to improve the performance of the interfacial evaporation desalination system provides a new method and reference. © 2023 Elsevier B.V.

关键词： Condensation

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Research and Implementation of control Strategies for Multiple Transmission Modes in Yongren-Funing HVDC

Research and Implementation of Control Strategies for Multip...

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power systems and Electrical Technology (PSET), IEEE International Conference on

作者： Yukun Zhu Libin Huang Shuyong Li Yihua Zhu Xuantao Jia a. State Key Laboratory of HVDC Electric Power Research InstituteChina Southern Power Grid Guangzhou China b. Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China c. CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China XJ Electric Co Ltd Xuchang China

The ± 500 kV Yongren-Funing HVDC transmission project is the first HVDC whose sending and receiving ends are both located in the same province, its inverter station is required to transmit power to different AC asynchronous grids according to the different requirements of the grid operation. The present control and protection system of HVDC cannot adapt to and meet the technical requirements of multiple power transmission modes. In order to achieve this goal, the control system of HVDC must be capable of automatic discrimination and sequential control, selecting the correct strategy of reactive power control (RPC), which is essential for the stable operation of the HVDC system. Therefore, based on the operating conditions of the HVDC system and the switch configuration of the AC switch yard of the inverter station, the principle, process and interlocking conditions of automatic switching between different transmission modes are systematically analyzed. Effects on RPC, last breaker and the over voltage protection of AC busbar are researched. The control strategies for multiple transmission modes have great significance for the similar HVDC/UHVDC transmission projects in the future.

关键词： Technical requirements Reactive power control HVDC transmission Design methodology Switches control systems Inverters

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Stability Analysis and Braking system Design of Icebreaker Propulsion system Based on 3L-NPC Inverter

Stability Analysis and Braking System Design of Icebreaker P...

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Smart power & Internet Energy systems (SPIES), International Conference on

作者： Nianzhou Liu Nan Fu Pengfei Xie Wenfeng Long Kui Wang Yongdong Li Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan Institute of Marine Electrical Propulsion Wuhan China State Key Lab of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

The icebreaker is important in the polar scientific investigation and resource exploration. There will be pulse and periodic load during the continuous icebreaking process, which may affect the propulsion system of the icebreaker. This paper mainly analyzes the effect of the impact load on the three-level neutral point clamped (3L-NPC) inverter with diode front-end, and demonstrates the relationship between the impact load and the feedback energy. Moreover, the choice of the resistance of the braking resistor is briefly discussed. The simulation results are given at last, which verify the rationality and correctness of the theoretical analysis.

关键词： Resistors Resistance Simulation Energy Propulsion Inverters Stability analysis

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Performance Analysis on Hydrogen-Battery Coordination Storage for Renewable Energy Accommodation in Large-Scale power system

Performance Analysis on Hydrogen-Battery Coordination Storag...

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Smart power & Internet Energy systems (SPIES), International Conference on

作者： Xiaopan Chen Qi Yang Na Meng Yan Cheng Jiang Wu Guanchu Chen MOEKLINNS Xi’an Jiaotong University Xi’an China Xinjiang Key Laboratory of Whole Process Simulation for Power System Electric Power Research Institute of State Grid Xinjiang Electric Power Co. Ltd. Urumqi China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

Energy storage is an effective measure to address the renewable energy curtailment problem in large-scale power systems. However, installing the same type of energy storage has limited improvement to the entire system when the total installed capacity of energy storage is fixed. In this paper, an optimal scheduling method for the hydrogen-battery coordination storage system is proposed to further improve renewable energy accommodation by combining the advantages of different types of energy storage. The coupling relationship between the power grid and the heat grid is also considered a way to reduce energy waste. Case tests based on actual operating data analyze the performance of systems with different energy storage configurations. Results indicate the effectiveness of the proposed method. The optimal installed capacity for hydrogen energy storage and battery energy storage is further researched to provide advice for energy storage planning.

关键词： Couplings Renewable energy sources Hydrogen storage Hydrogen Optimal scheduling power grids Planning

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Research on control strategy of maximum power tracking variable step size perturbation & observation method for photovoltaic power generation system 5

Research on control strategy of maximum power tracking varia...

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5th International Conference on Energy Engineering and Environmental Protection, EEEP 2020

作者： Gao, Zhen Kai, Fei Xi, Ziqiang Hubei University of Technology Hubei Prov. Key Lab. of Efficient Solar Energy Utilization and Energy Storage Operation Control Wuhan430068 China State Grid Hubei Electric Power Company Wuhan Jiangxia District Power Supply Company Wuhan430000 China

There are three defects of traditional perturbation and observation method in the maximum power tracking control process of photovoltaic power generation systems, which are oscillation, misjudgment and poor tracking accuracy. Thus, a variable step perturbation and observation method based on power prediction is proposed for three-level DC/DC converters in this paper, which effectively solved oscillation, misjudgment, tracking accuracy problems, improving the tracking speed and precision of the algorithm, and the verification results of the maximum power tracking algorithm based on the three-level DC/DC converter structure has also been indicated. © Published under licence by IOP Publishing Ltd.

关键词： DC-DC converters

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Carbon Emission Responsibility Accounting in Renewable Energy-Integrated Dc Traction power systems

SSRN

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SSRN 2023年

作者： Li, Zhanhe Li, Xiaoqian Lu, Chao Ma, Kechun Bao, Weihan State Key Laboratory of Power System Operation and Control Dept. of Electrical Engineering Tsinghua University Beijing100084 China Sichuan Energy Internet Research Institute Tsinghua University Sichuan Chengdu610299 China School of Electrical Engineering Xi'an Jiaotong University Shaanxi Xi’an710049 China

This study presents a practical method to determine the carbon emission responsibility (CER) in DC traction power systems (TPSs) that incorporate renewable energy sources. The increasing importance of carbon peaking and neutrality necessitates novel carbon financing policies, such as carbon taxes and cap-and-trade, for which accurate CER calculation is crucial. This study focuses on CER related to electrical energy consumption, a complex task due to the separation of energy usage and carbon dioxide emissions. To address this, the research adapts the carbon emission flow (CEF) method to suit renewable energy-integrated DC TPSs, considering the unique characteristics of rail vehicles as energy prosumers and challenges in real-time power flow tracking. The proposed rail vehicle CEF model and real-time power flow tracing approach offer practical CER accounting solutions for system planning and real-time operation. A case study based on real engineering data validates the effectiveness of these methods, demonstrating their fairness to rail transit systems and AC utilities. © 2023, The Authors. All rights reserved.

关键词： Renewable energy resources

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Hardware in Loop Real-Time Simulation Test Research and Engineering Application of Multi-Terminal Hybrid Ultra High Voltage DC Current control and Protection system

Hardware in Loop Real-Time Simulation Test Research and Engi...

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Sustainable power and Energy Conference (iSPEC)

作者： Qinlei Chen Qi Guo Xuehua Lin Shuyong Li Libin Huang Deyang Chen Zhijiang Liu Chao Luo Guanming Zeng Yuanhong Lu Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of HVDC China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665485234

The multi-terminal hybrid ultra-high voltage direct current (MTH-UHVDC) transmission technology combining line commuted converter ultra-high voltage direct current (LCC-UHVDC) technology and modular multilevel converter ultra-high voltage direct current (MMC-UHVDC), provides a more flexible and advanced mode to meet the needs of longer distance and larger capacity clean energy transmission. Compared with the two-end HVDC system, the control and protection (C&P) functional and dynamic characteristics of MTH-UHVDC transmission system are more complex. The real-time simulation technology must be used to carry out the experimental research before the engineering application. However, the hardware in loop (HIL) real-time simulation test of MTH-UHVDC transmission system is faced with many technical problems, such as multi-type interface of test system, accurate modeling of UHVDC MMC valve, full access of C&P devices, etc. Therefore, from the perspective of simulation test research and engineering application, this paper proposes a HIL real-time simulation test method for C&P system of MTH-UHVDC transmission system. The design of test system, accurate modeling of primary system, modeling of C&P system, interface technology of test system, functional and performance test method of C&P system and engineering application are deeply studied. Taking kunliulong project, the world’s first MTH-UHVDC project, as the application background, a real-time simulation test system for C&P system is established by the proposed method. The functional performance test (FPT) and dynamic performance test (DPT) are carried out using the established test system, and the simulation test waveforms are compared with the field test waveforms. The results show that the response characteristics of the two systems are consistent, and the test system established in this paper can meet the needs of accurate real-time simulation test and research, and can provide technical support for the application of M

关键词： Performance evaluation Current control Multilevel converters HVDC transmission High-voltage techniques systems modeling Valves

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Design and Application Research of Synchronous Temporary Block Function between Valve Groups on Modular Multilevel Converter Ultra High Voltage Direct Current system

Design and Application Research of Synchronous Temporary Blo...

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Sustainable power and Energy Conference (iSPEC)

作者： Qinlei Chen Xuehua Lin Zhijiang Liu Qi Guo Libin Huang Guanming Zeng Shuyong Li Deyang Chen Chao Luo Electric Power Research Institute China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation China Southern Power Grid Guangzhou China State Key Laboratory of HVDC China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665485234

Compared with the half controlled power electronic devices such as thyristor, the over-current ability of fully controlled power electronic devices such as insulated gate bipolar transistor (IGBT) is weak. In order to ensure that bridge arm current does not exceed the bearing range of modular multilevel converter (MMC) switching devices under AC fault ride through and other scenarios, MMC high voltage direct current (HVDC) system projects are equipped with temporary block (TB) function, IGBTs are protected by suspending the trigger pulse before bridge arm current reaches the maximum safe current of the switch. The structure of high side and low side valve group (VG) in series are adopted in ultra high voltage direct current (UHVDC) system. For line commuted converter (LCC) UHVDC system, the converter is current source type, During normal operation, there is no need to control the voltage balance between high side and low side VG, and after one VG is disturbed by commutation failure, the impact on another VG is relatively small. For MMC-UHVDC system, the converter is voltage source type, during normal operation, the voltage balance between high side and low side VG should be controlled. When a transient disturbance such as AC fault occurs, if one VG is temporary blocked due to bridge arm over-current, and another VG is not temporary blocked or the time of temporary blocked is later, the VG blocked first may tripped due to sub-module (SM) overall over-voltage or bridge arm over-current, and the scope of the accident is expanded, which is not conducive to the flexible and reliable operation of MMC-UHVDC. Therefore, the impact of non synchronous temporary block of MMC-UHVDC VGs is firstly analyzed in this paper, and then synchronous temporary block (STB) function between VGs is proposed, and the hardware interface scheme, STB signal sending and receiving logic, enable conditions and other aspects between VGs are elaborated. Finally, taking kunliulong project, the world’

关键词： Insulated gate bipolar transistors Multilevel converters Bridge circuits High-voltage techniques Switches Valves Real-time systems

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Influence Analysis of Thermal states on Dynamic Frequency Response for power systems with High Renewables

Influence Analysis of Thermal States on Dynamic Frequency Re...

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2020 IEEE Sustainable power and Energy Conference, iSPEC 2020

作者： Cao, Yongji Zhang, Hengxu Li, Changgang Sun, Leshu Li, Chen Qin, Hao Guo, Qi Zhu, Yihua Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Key Laboratory of HVDC Electric Power Research Institute National Energy Power Grid Technology RD Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

ISBN: (纸本)9781728191645

As thermal generators are substituted by renewables, the power reserves are decreasing and the influence of boiler thermal states on frequency dynamics becomes more severe. The variations of thermal states can aggravate dynamic frequency response, especially for power systems with high renewables. However, the system frequency response (SFR) model has been widely adopted, but in which the thermal states are neglected. This paper analyzes the influence of thermal states on dynamic frequency response quantitatively. The modified SFR models are built by extending the boiler models with different simplification degrees. Then, from the view of the response amplitude and time, the quantitative indices are established to measure the response trajectories of modified SFR models. And the characteristics of frequency dynamics and the statistic indices of data sequences are utilized to analyze the influences of thermal states and assess the performances of modified SFR models. According to the results of comparative analysis, the neglect of thermal states incurs more optimistic frequency dynamics and impairs the frequency stability of power systems with high renewables. Additionally, the accuracy of the SFR model can be enhanced even with the most simplified boiler model. © 2020 IEEE.

关键词： Frequency response

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