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检索条件"机构=Beijing Key Laboratory of DC Grid Technology and Simulation"

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Economic Analysis of Energy Storage Peak Shaving Considering Full Life Cycle Cost 5

Economic Analysis of Energy Storage Peak Shaving Considering...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Li, Junhui An, Chenyu Zhang, Jingxiang Li, Cuiping Zhao, Haiji Yu, Jun Jin, Xuezhu Hou, Kaiyuan Xu, Fei Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin132012 China Northeast Branch of State Grid Corporation of China Liaoning Shenyang110180 China Haidian District Beijing100084 China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

As an effective means to improve the wind power consumption capacity of power system, the economy of energy storage participation auxiliary service has received extensive attention from academic circles. In this paper, the cost composition of the whole life cycle of the electrochemical energy storage system is comprehensively considered, and the economic analysis of different Wheres of electrochemical energy storage participating in peak shaving auxiliary services is conducted according to the operation rules of the power market in northeast China. Firstly, four widely used electrochemical energy storage systems were selected as the representative, and the control strategy of source-side energy storage system was proposed for real-time peak modulation in wind farms. Secondly, the peak shaving economic model based on the life cycle cost of energy storage is constructed. Finally, by selecting the annual data of a wind farm in northeast China, the economic benefits of different Wheres of electrochemical energy storage are analyzed and compared, and the reasonable opinions on improving the benefits of energy storage are given. © 2022 IEEE.

关键词： Life cycle

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Multi-Type Electric Vehicle Schedulability Modeling Method based on User Charging Behavior Characteristics

Multi-Type Electric Vehicle Schedulability Modeling Method b...

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China International Conference on Electricity Distribution, CICED

作者： Yinjuan Xue Qifang Chen Haiqing Cai Mingchao Xia Haohan Gu School of Electrical Engineering Beijing Jiaotong University Beijing China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (数字)9798350368345

ISBN: (纸本)9798350368352

With the rapid proliferation of Electric Vehicles (EV s), effectively leveraging the regulation potential of EV charging loads has become a prominent issue. This paper proposes a multi-type EV schedulability modeling method based on the analysis of charging behavior characteristics of different user types. The model comprehensively considers the charging characteristics of various types of EV s, including private cars, ride-hailing vehicles, and taxis, utilizing a charging start-stop probability distribution model. Case studies demonstrate that this model can not only accurately reflect the charging demands of EV s but also provide valuable references for strategies involving EV fleet participation in grid regulation.

关键词： Electric potential Analytical models Regulation Probability distribution Electric vehicle charging Demand response Automobiles Public transportation Load modeling

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Low-Frequency Offshore Wind Power Transmission System with Dual-End grid-Forming Control

Low-Frequency Offshore Wind Power Transmission System with D...

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International Conference on Renewable Energy and Power Engineering (REPE)

作者： Nan Fu Bao Liu Yunfei Xu Sitong Zhu Kui Wang Yongdong Li State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350375558

ISBN: (纸本)9798350375565

The offshore wind power has been gaining increasing attention in recent years. Low-frequency alternating current (LFAC) transmission is emerging as a promising technology with specific advantages for offshore wind power transmission. This paper discusses the structure and control of the offshore wind power transmission system based on LFAC. In order to enhance the support for the power system, grid-forming control can be implemented on both sides of the modular multilevel matrix converter (M3C) used in LFAC. Additionally, the capacitor voltage control of M3C is briefly introduced. Furthermore, power reserve control is utilized to enable wind turbines to participate in primary frequency regulation. Finally, the effectiveness of the designed control system is verified through simulation using PSCAD/EMTdc, further demonstrating the efficacy of the strategy.

关键词： Current control Capacitors Wind power generation Wind farms Control systems Wind turbines Voltage control Matrix converters Frequency control grid forming

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Fault Ride-through Control of Improved Voltage Drop Method for MMC-HVdc Connected Renewable Energy 12

Fault Ride-through Control of Improved Voltage Drop Method f...

引用

12th International Conference on Renewable Power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Dong, Xuezheng Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

Renewable energy connected to the grid via MMC-HVdc should have fault ride-through (FRT) ability. However, it is difficult to achieve reliable FRT without high-speed and reliable communication between converters in the system. The coefficient of the traditional voltage drop method is qualitatively set as a linear constant, making it difficult to quickly reach the required voltage under different faults. As a result, there are long step delays due to the coordination of converters in the system, which consequently causes the dc system to operate at high voltage during FRT. To address this problem, this paper analyzes the dynamic characteristics of the dc system and the principles of the traditional voltage drop method. Based on this analysis, FRT control of improved voltage drop method for MMC-HVdc connected renewable energy is proposed. Finally, a simulation model is constructed in the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed method. Additionally, the proposed method is compared with the traditional method. The results demonstrate that the proposed method reduces the step delay and achieves accurate and reliable FRT. © The Institution of Engineering & technology 2023.

关键词： HVdc power transmission

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Offline Parameter Identification Method Considering the Nonlinear Characteristics of grid-connected Inverter Controller 12

Offline Parameter Identification Method Considering the Nonl...

引用

12th International Conference on Renewable Power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Jiang, Xinying Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

The correct model parameters play important role in fault characteristics analysis and protection design. It is a necessity to identify the parameters based on external characteristics due to the problem of parameters black-box. However, existing studies lack concerns in the nonlinear control of the control system during the transient, and cannot analysis the transient characteristics of the converter. Therefore, the inverter parameter identification method based on the dynamic model of phase-locked loop (PLL) is proposed in this paper. It is revealed that the influence of the dynamic process of PLL on the identification model. Considering the dynamic characteristics of PLL, a transient current identification model is established. A parameter identification method based on structural similarity (SSIM) was proposed. simulation examples show that the proposed parameter identification method can identify parameters accurately. © The Institution of Engineering & technology 2023.

关键词： Phase locked loops

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A NON-UNIT ADAPTIVE TRAVELING WAVE PROTECTION METHOD FOR FLEXIBLE dc TRANSMISSION LINES BASED ON SUPPLEMENT OF VOLTAGE DATA 12

A NON-UNIT ADAPTIVE TRAVELING WAVE PROTECTION METHOD FOR FLE...

引用

12th International Conference on Renewable Power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Yao, Kunpeng Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

Traveling wave (TW) protection is crucial for ensuring the safety and stability of flexible dc transmission lines. Thereinto, shortening the sampling step is the key to improve the sensitivity of the derivative-based TW protection. However, higher sampling frequency is difficult to engineer and the protection performance will be constrained in case of the high resistance faults. To address this issue, a non-unit adaptive TW protection based on the supplement of voltage data has been proposed. Firstly, the voltage data is realized to complement utilizing the Lagrange's median theorem at the line boundary, which improves the sampling frequency. Then, it has been observed that the fault current variation is negatively correlated with transition resistance. Specially, the proposed protection takes this fully into account by incorporating the adaptive threshold that covers differences among various fault locations. Therefore, the proposed protection can effectively distinguish internal faults with high sensitivity. Finally, a two-terminal ±500kV MMC-HVdc (modular multilevel converter-high voltage direct current) system is built using PSCAD/EMTdc. The simulation results demonstrate that the line faults can be fast and correctly identified, even with 300 Ω fault impedance, in various fault scenarios. © The Institution of Engineering & technology 2023.

关键词： Electric fault currents

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A New Energy Power grid Expansion Planning technology Considering Optimal Economy 3

A New Energy Power Grid Expansion Planning Technology Consid...

引用

3rd International Conference on Green Energy, Environment and Sustainable Development, GEESD 2022

作者： Song, Xinfu Xin, Chaoshan Yu, Jin Yu, Zhiyong Shen, Danhua Ma, Junliang State Grid Xinjiang Electric and Technological Research Institute Xinjiang Wulumuqi830000 China Beijing Guantao Law Firm Beijing China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Northeast Electric Power University Jilin Jilin132012 China

ISBN: (纸本)9781643683126

This paper examines the path of new energy development in China against the backdrop of carbon maximum and carbon neutralization, and studies the risk of large scale new energy power transmission. In order to solve the complex uncertainty challenges of renewables power and power grid expansion planning, this paper studies and proposes an optimal economic planning model, which includes the thermal power generation start-up and shutdown expenses during the operation, the hydro power generation expenses of surplus water of reservoir, and the curtail penalty cost of new energy output power, the investment of new planning lines. The model has also considered the constraints of balance for power generation and load consumption, the power change rate, and operation, which are calculated based on the time-series operation simulation of new energy power system. Based on the functions, the process of power grid planning technology has been proposed. The planning model proposed in this paper can consider the new energy power characteristics of generation, realize the optimal planning of different power grid schemes. According to the case study findings, the new transmission line can relieve the pressure of local new energy transmission, while also improving power flow distribution as well as the rate of new energy utilization. © 2022 The authors and IOS Press.

关键词： Expansion

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ACTIVE POWER CONTROL STRATEGY DEPENDING ON FREQUENCY FOR MMC-HVdc SYSTEM CONNECTED TO OFFSHORE WINDFARMS 22

ACTIVE POWER CONTROL STRATEGY DEPENDING ON FREQUENCY FOR MMC...

引用

22nd International Symposium on High Voltage Engineering, ISH 2021

作者： Li, Fangyuan Zhu, Lin Zhou, Jiapei Kou, Longze Ren, Bixing State Key Laboratory of Advanced Power Transmission Technology China Beijing Key Laboratory of DC Grid Technology & Simulation China Global Energy Interconnection Research Institute Co. Ltd Beijing China Electric Power Research Institute of State Grid Jiangsu Electric Power Co. Ltd China State Grid Jiangsu Electric Power Co. Ltd China

ISBN: (纸本)9781839536052

The study proposes an active power control strategy of the modular multilevel converter (MMC) for connecting large offshore windfarms. The strategy can be used to enhance the frequency stability of onshore alternating current (AC) system. It considers the working principle of windfarms, and can tightly control the output of active power of offshore network, which contributes to onshore frequency regulation by a changeable transmission of the offshore wind energy. The dynamic performance of the High Voltage Direct Current (HVdc) based on MMC system using the proposed methods has been verified by PSCAD/EMTdc simulations. In different scenarios, the HVdc system can adjust active power accurately depending on the onshore frequency which confirms the feasibility of the methods. © 2021 The Institution of Engineering and technology.

关键词： Offshore oil well production

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A Fault Ride-Through Method Based on Energy Dissipation Device in the Scenario of Flexible HVdc grid Connection of Offshore Wind Power

A Fault Ride-Through Method Based on Energy Dissipation Devi...

引用

Electrical Engineering and Control Technologies (CEECT), Conference on

作者： Xifang Huang Yu Wang Jing Ge Chengbin Chi Fusuo Liu Stability Technology Branch Company NARI Group Corporation State Grid Electric Power Research Institute Nanjing China Beijing Key Laboratory of DC Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China

ISBN: (纸本)9781665499002

The flexible HVdc transmission technology based on the modular multilevel converter (MMC) topology has a very broad application prospect in the process of large-scale renewable energy collection and transmission. This technology has become one of the best choices for long-distance offshore wind power farms to connect to the onshore power grid. In view of the special working conditions such as overvoltage in the fault state, this article proposes a controllable large-capacity self-recovery energy-dissipation device for the first time to improve the transient characteristics of the dc and AC power system. The proposed scheme has the advantages of no harmonic generation during operation, relatively simple control strategy and high current impact resistance. The electromagnetic transient simulation shows that the proposed scheme can effectively solve the overvoltage problem of dc in the offshore wind power flexible HVdc system, and improve the reliability of the HVdc system.

关键词： Arresters HVdc transmission Energy dissipation Wind power generation Power system reliability Topology Reliability

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Capacitor Voltage Balancing Strategy Based on Zero-Sequence Voltage Injection for Half-Wave Commutated Modular Multilevel Converter

Capacitor Voltage Balancing Strategy Based on Zero-Sequence ...

引用

International Conference on Power Electronics and Motion Control (IPEMC)

作者： Nan Fu Bao Liu Yunfei Xu Sitong Zhu Kui Wang Yongdong Li Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Changping Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Half-wave commutated modular multilevel converter (HWC-MMC) is suitable for high-voltage large-capacity AC-AC conversion, and an appropriate capacitor voltage balancing strategy is essential. This paper analyzes the condition of capacitor voltage balancing and proposes a capacitor voltage balancing strategy based on optimal zero-sequence voltage injection using the model predictive control. Finally, the simulation is carried out to verify the proposed strategy.

关键词： Multilevel converters Voltage fluctuations Capacitors High-voltage techniques Power system harmonics Power electronics Steady-state

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