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

共 136 条记录，以下是61-70 订阅

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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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Real Time simulation Modeling Method for Controllable Self Recovery Energy Dissipation Device

Real Time Simulation Modeling Method for Controllable Self R...

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International Conference on power System technology (powerCON)

作者： Minhua Xie Lu Gao Feng Ji Chang Lin Heming Yan Junjie Lin State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute Co. Ltd Beijing China

In order to avoid equipment damage or valve breakdown caused by power surplus during AC system short-circuit faults in the hybrid cascaded ultra HVdc, the controllable and adaptive energy absorption device is installed parallel with the MMC converter valve. To accurately simulate the characteristics of the system and test the control and protection hardware in the loop, the small time-step real-time simulation is needed. In order to achieve the small time-step real-time simulation of the whole system including nonlinear controllable energy absorption device, a small inductor is used to separate the nonlinear network from the linear network based on equivalent transmission line method. The nonlinear subnetwork is solved using Newton-Raphson iteration method and the linear system is linearly solved. The comparison results show that the proposed method is high efficient and precise.

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A NOVEL CONTROL METHOD BASED ON THE INSTANTANEOUS THYRISTOR VOLTAGE TO MITIGATE COMMUTATION FAILURE IN HVdc SYSTEMS 10

A NOVEL CONTROL METHOD BASED ON THE INSTANTANEOUS THYRISTOR ...

引用

10th Renewable power Generation Conference, RPG 2021

作者： Zheng, Lin Zhang, Jianan Liu, Jin Wang, Huafeng Lin, Zhiguang Song, Linwei Liu, Panpan State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Beijing China

ISBN: (纸本)9781839536069

Commutation failure is a typical fault that occurs in the inverter valves of the HVdc transmission system. Continuous commutation failure will lead to serious results to the power system especially in multi-infeed HVdc power transmission system. In this paper, a novel control method to mitigate commutation failure in HVdc systems due to voltage dips caused by AC system faults is proposed. This detection method is based on instantaneous values of the thyristor voltage and it is realized by Thyristor Triggering and Monitoring (TTM) device and valve base electronics (VBE), which makes the control system react quickly and detect commutation failure with high-precision. After detecting the commutation failure, the firing angle at the inverter station is reduced by a certain angle to extend the commutation margin. The proposed commutation failure mitigation method is tested in various fault simulation using the PSCAD/EMTdc software. A single-infeed HVdc transmission system is created to test the method's effectiveness and a two-infeed HVdc transmission system is developed to study the method's performance in the multi-infeed HVdc transmission system. The test results demonstrate that the proposed method is highly effective in mitigating the continuous commutation failure in both the single-infeed and multi-infeed HVdc transmission system. © The Institution of Engineering and technology.

关键词： Thyristors

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

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

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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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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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Overvoltage Suppression Strategy Based on Active Control of Current for Half-Wave Commutated Modular Multilevel Converters

Overvoltage Suppression Strategy Based on Active Control of ...

引用

IEEE International Conference on power and Energy Systems (ICPES)

作者： Bao Liu Yunfei Xu Guoliang Zhao Nan Fu Chen Jia State Key Laboratory of Advanced Power Transmission Technology China Electric Power Research Institute Beijing China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350391329

ISBN: (纸本)9798350391336

Flexible low-frequency AC transmission technology combines the advantages of 50 Hz AC transmission and dc transmission, and has good application scenarios. High voltage and large capacity AC/AC converters are the core equipment of flexible low-frequency AC transmission systems. The proposal of half-wave commutated modular multilevel converters effectively reduces the number of components and improves system economy. In view of this, this paper proposes an overvoltage suppression strategy for active control of inductor current, which effectively reduces the overvoltage level during commutation. The article first introduces the sparse topology and mathematical model of the half-wave commutated modular multilevel converters. Secondly, the mechanism of overvoltage generation is analyzed. Then, overvoltage suppression strategies are proposed. Finally, a PSCAD simulation model is built to verify the effectiveness and feasibility of the proposed method through simulation.

关键词： Multilevel converters Reactive power Bridge circuits Valves Mathematical models Topology Safety Voltage control Inductors PSCAD

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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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Auxiliary dc Fault Clearing Strategy for Low Capacitance Half-bridge MMC 4

Auxiliary DC Fault Clearing Strategy for Low Capacitance Hal...

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4th International Conference on power and Energy technology, ICPET 2022

作者： Yang, Yukun Fan, Qiang Xu, Jianzhong Zhao, Chengyong Xue, Yinglin Zhu, Quanle North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China State Grid Economic and Technological Research Institute CO. Ltd Dc Technology Consulting Centre Beijing China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

By harmonic current injection to reduce the capacitance of bridge arm sub modules (SMs), the volume and weight of MMC can be effectively reduced, and the lightweight of MMC can be realized. Based on the theoretical analysis of the characteristics of low capacitance MMC in dc fault condition, the problem of fast discharge of SMs exists under low capacitance when other parameters remain unchanged, which may lead to low voltage blocking of SMs during the clearing process of dc fault. From the perspective of equivalent charge, a dc fault clearing strategy based on low capacitance half-bridge MMC is proposed. By adjusting the total number of SMs in each phase according to the capacitance reduction ratio in MMC during the fault clearing process, the discharge speed of the SMs' capacitor can be effectively reduced and the recovery of the system can be accelerated. Based on PSCAD / EMTdc environment, a simulation program is built to verify the effectiveness of the auxiliary strategy of dc fault clearing in low capacitance MMC. © 2022 IEEE.

关键词： Capacitance

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Harmonic Stability Analysis and Damping Strategy for dc system of MMC-HVdc Across Wide Frequency Range

Harmonic Stability Analysis and Damping Strategy for DC syst...

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2021 International Conference on power System technology, powerCON 2021

作者： Kou, Longze Peng, Yixuan Ji, Ke Zhu, Lin Ji, Feng Liu, Dong Global Energy Interconnection Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China Global Energy Interconnection Research Institute Co. Ltd Beijing Key Laboratory of DC Grid Technology Simulation Beijing China

ISBN: (纸本)9781665407373

The harmonic resonance and instability problems become prominent in recent years with the development and application of modular multilevel converter (MMC) based HVdc system. The impedance model of MMC can be used to facilitate the analysis of harmonic stability and the design of mitigation method. In this paper, the accurate dc impedance model of MMC is firstly derived based on harmonic state space (HSS) method. The internal dynamics and control actions (control loop delay included) of MMC are considered in the derivation process. With consideration of impedance characteristics of dc transmission lines, the harmonic stability for the dc system of MMC-HVdc are theoretically analyzed across a wide frequency range and the possible harmonic resonance problems are revealed. On this basis, a modified dc damping control is proposed to mitigate the harmonic resonances and improve the harmonic stability at all possible frequency points. At last, the proposed model and control method are validated by simulation results. © 2021 IEEE.

关键词： Damping

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