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

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Research on Photovoltaic MPPT Based on Improved Butterfly Algorithm

Research on Photovoltaic MPPT Based on Improved Butterfly Al...

引用

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

作者： Zun Ma Xian Meng Chao Xing Binjiang Hu Yihua Zhu Liang Tu System Analysis and DC Technology Research Institute Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Power system simulation and control technology department State Key Laboratory of HVDC EPRI CSG Guangzhou China Power system simulation and control technology department National Energy Power Grid Technology R&D Centre Guangzhou China Power system simulation and control technology department CSG Key Laboratory for Power System Simulation Guangzhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

To solve slow response speed and poor stability of traditional MPPT algorithms under rapidly changing environmental conditions, a MPPT control strategy combining improved butterfly algorithm and disturbance observation method is proposed. Firstly, the butterfly position in the population is initialized by Tent map, increasing the search space; Secondly, Gaussian mutation strategy is introduced to make the algorithm break out of local extremes; Then, a dynamic probability switching mechanism is adopted to balance the weight relationship between global and local search, improving algorithm optimization efficiency; Finally, in the later stage, disturbance observation method is used to track the maximum power and reduce power oscillation. simulation examples show that the proposed algorithm can find the maximum power point quickly and accurately under both static and dynamic shading conditions, and the power output is more stable.

关键词： Maximum power point trackers Photovoltaic systems Renewable energy sources Heuristic algorithms Switches Aerospace electronics Stability analysis Oscillators Optimization

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Frequency Modulation Strategy of Wind power Generation in power System of High Renewable Penetration

Frequency Modulation Strategy of Wind Power Generation in Po...

引用

power Energy Systems and Applications (ICoPESA), International Conference on

作者： Chengbin Chi Shan Liu Qi Liu Fan Li State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd Beijing China State Grid Shanghai Municipal Electric Power Compan Shanghai China

Wind turbines generally adopt the maximum wind energy tracking control strategy, which makes them obtain the best power generation efficiency. However, this makes wind turbines unable to respond to changes in system conditions, provide inertial support for the system, and participate in the primary frequency modulation of the system, which brings challenges to the frequency safety of high-proportion new energy power systems. In order to improve the frequency stability of high-proportion new energy power system and make wind turbines participate in frequency control actively, this paper proposes a primary frequency modulation control strategy based on load reduction for doubly-fed wind turbines. According to the aerodynamic characteristics of variable pitch wind turbine, a coordinated load shedding control strategy combining variable pitch and variable speed operation was proposed to make the wind turbine have active power reserve capacity. A frequency response link is added to the power control, so that the unit can output power to realize inertia and frequency support when the system frequency fluctuates. The simulation results show that the proposed control strategy can improve the system inertia and primary frequency modulation capability in the full wind speed operating domain under the load mutation condition, and improve the frequency stability of the system after the wind turbine is connected to the grid.

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Analysis and Improvement of the AC-Voltage Control of GFM MMC to Improve the Voltage Stability of AC/dc Hybrid power grid

Analysis and Improvement of the AC-Voltage Control of GFM MM...

引用

IEEE International Symposium on power Electronics for Distributed Generation Systems (PEDG)

The grid-forming control is regarded as an effective solution for grid-tied converters to operate under weak grid conditions. Currently, most of the grid-forming control strategies are designed for 2-level voltage source converters. The power loop-AC voltage loop-AC current loop control is usually adopted in these strategies. This control structure highly relies on the AC side filter capacitor. However, in high-voltage situations, the modular multilevel converter, which has no AC side filter capacitor, is commonly adopted. The integral effect of the filter capacitor in the original control path is replaced by the differential effect of the grid impedance, which worsens the performance of AC voltage control. To solve this problem, the steady-state model of MMC using grid-forming control is established. Based on this model, two improved AC-voltage control strategies are proposed in this paper. simulation results in PSCAD/EMTdc show that the proposed control realizes desired dynamic control of the dc voltage.

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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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A Data-Driven Method for Fast Calculation of Electromagnetic Radiation Field of Flexible HVdc Converter Valves

A Data-Driven Method for Fast Calculation of Electromagnetic...

引用

Frontiers of power and Energy (ACFPE), Asian Conference on

作者： Haijun Tang Minhua Xie Qin Qin Shuncheng Wang Wei Bao Minghui Su State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Grid Shanghai Electric Power Research Institute State Grid Shanghai Municipal Electric Power Company Shanghai China Department of Electrical Engineering North China Electric Power University Baoding China

ISBN: (数字)9798350367676

ISBN: (纸本)9798350378467

In order to solve the problem of time-consuming computation of electromagnetic radiation field on specific planes of flexible HVdc converter valves, this paper proposes a fast calculation method which combines Proper Orthogonal Decomposition (POD) and Radial Basis Function Response Surface method with Linear Polynomial(RBFLP) to improve the calculation efficiency. To validate the accuracy and practicality of this method, a three-phase MMC converter valve antenna model was constructed. The excitation of the antenna model are the spectral quantities of the MMC valve currents and voltages transformed from the time domain. And the calculation results on any field plane will be predicted from the known simulation results on discrete planes from available software. The results show that the maximum absolute error in the test conditions between the reduced-order prediction data and the available software simulation data is 1.1326. And the absolute error gradually decreases as the distance increases. Therefore, this method is suitable for fast calculation of electromagnetic radiation field where efficiency is necessary more than accuracy. Since the results are needed for only a few discrete planes, the simulation of all the needed planes is avoided, especially if there are many needed planes, which is convenient and efficient.

关键词： Accuracy HVdc transmission simulation Electromagnetic radiation Predictive models Valves Software Reduced order systems Response surface methodology Time-domain analysis

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Research on simulation Modeling Method of New Distributing Network with Large Scale Distributed Energy Sources

Research on Simulation Modeling Method of New Distributing N...

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International Conference on power System technology (powerCON)

作者： Huaiguang Gu Longze Kou Lin Zhu Yuqin Gao Yang Gao Ping Xiong State Key Laboratory of Advanced Transmission Technology Beijing Key Laboratory of DC Power Grid Technology and Simulation State Grid Smart Grid Research Institute Co. LTD. Changping Beijing China State Grid Hubei Electric Power Research Institute Hongshan District Wuhan City Hubei Province China

In this paper, a distribution network model with distributed power supply is built. Firstly, the current situation of new energy power generation under the background of carbon neutralization is introduced in the overview. The models of fans, photovoltaic and hybrid energy storage are established respectively, and the corresponding control methods such as maximum power tracking, constant power control, bus voltage control and so on are described in detail. On this basis, the distribution network modeling of photovoltaic energy storage intermodal transportation is completed; Each simulation model is shown.

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Analysis And Calculation Of The Short-Circuit Current Of Xiamen VSC-HVdc Project 5

Analysis And Calculation Of The Short-Circuit Current Of Xia...

引用

5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Zhu, Lin Gu, Huaiguang Li, Fangyuan Kou, Longze Liu, Dong State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Beijing China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing China

ISBN: (纸本)9781665434256

For the heavy load urban power grid, the short-circuit current is closed to the breaking capacity of the AC breaker. After the voltage sourced converter high voltage direct current (VSC-HVdc) is connected, the short-circuit current of VSC-HVdc will be provided during the fault period, which will cause the short-circuit current exceed the standard value and affect the normal operation of the power grid. Taking the Xiamen VSC-HVdc project as an example, this paper analyses the VSC-HVdc control mode, obtains the short-circuit current calculation method. The Xiamen AC/dc hybrid model is built, and the correctness of the proposed method is verified by simulation. The results show that the amplitude and phase angle of the VSC-HVdc short-circuit current have great influence on the total short-circuit current, and the amplitude is easily controlled by the current limiting controller, so the phase angle control should be emphasized. For Point of Common Coupling (PCC), the short-circuit current of single-phase grounding fault may be larger than three-phase grounding fault, which should be taken into account. The ideas provided in this paper have practical engineering significance for the city power supply by VSC-HVdc. © 2021 IEEE

关键词： Short circuit currents

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Control Strategy of Direct-Driven PMSM Wind Turbines Participating in Fast Frequency Response of power grid

Control Strategy of Direct-Driven PMSM Wind Turbines Partici...

引用

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

作者： Heming Yan Feng Ji Hui Pang Wenxuan Jia Chang Lin Xiangyu Pei State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China The college of Electrical and Electronic Engineering North China Electric Power University Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd. Beijing China

The large-scale grid connection of wind power brings challenges to the frequency stability of the power system, the system inertia decreases, the frequency regulation capability deteriorates, and the traditional wind turbine is difficult to meet the frequency regulation demand of the system. To address the problem of slow response of existing wind turbines participating in frequency regulation, this paper proposes a control method for permanent magnet direct-driven wind turbines participating in fast frequency response of the grid, based on power electronic converters equipped with electromagnetic level control speed to rapidly change the electromagnetic torque of the wind turbine rotor according to the system frequency change, increase or decrease the wind turbine speed to fully utilize the stored or released rotational inertia and achieve fast power regulation of the wind turbine. The results of the frequency step simulation of the permanent magnet direct-driven synchronous wind power system show that the fast frequency regulation response time of the control method proposed in this paper can reach the millisecond level.

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Modeling and simulation Method of Offshore power Delivery System with Hydrogen Production

Modeling and Simulation Method of Offshore Power Delivery Sy...

引用

Electrical Engineering and Control Technologies (CEECT), Conference on

作者： Huaiguang Gu Jian Zhang Longze Kou Jiapei Zhou State Key Laboratory of Advanced Transmission Technology Beijing Key Laboratory of DC Power Grid Technology and Simulation State Grid Smart Grid Research Institute Co. LTD. Beijing China

ISBN: (纸本)9781665499002

With the depletion of global fossil energy and the worsening of global environmental problems, the development and utilization of renewable clean energy has become an important direction in the world's energy technological change. Hydrogen energy, as a highly clean renewable energy, has become a research hotspot in the world. In this paper, a typical offshore energy system model is proposed. Firstly, according to the thermodynamic phenomena and electrochemical dynamic characteristics of the alkaline electrolyzer, the electromagnetic transient model of hydrogen production unit is established. Then, a grid-connected control scheme based on the direct current of the electrolyzer is proposed to connect the offshore wind farm with the hydrogen production system. Finally, a complete model is built on PSCAD and the electromagnetic transient simulation analysis is carried out. The results show that the system can provide stable and reasonable dc current to hydrogen production system through 60 mw wind farm, which verifies the correctness and effectiveness of the model.

关键词： Production systems Renewable energy sources Analytical models Thermodynamics Wind energy Wind speed Hydrogen

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Enhanced power Synchronization Based Vector Control with Fault Ride Through for VSC-HVdc

Enhanced Power Synchronization Based Vector Control with Fau...

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

作者： Rongcai Pan Chunpeng Li Yuexi Yang Xiao Zhou State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing P. R. China Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute Co. Ltd Beijing P. R. China

The power synchronization based vector control is proposed with the power synchronization controller (PSC) replacing the conventional phase locked loop (PLL) recently. It is reported that the power synchronization unit can have comparable performance of the conventional PLL based vector control. However, the steady state analysis of the PSC control dq frame orientation and the corresponding steady equilibrium points are not discussed. Worse more, fault ride through of the PSC based vector control is not addressed in the related literatures. First, the measurements error on the performance on PSC based vector control is analyzed and the enhanced PSC based vector control is proposed to further reduce the control complexity. Based on the enhanced PSC based vector control, the equilibrium points and the dq frame orientation of PSC based vector control and its comparison with PLL based one are analyzed in the normal operation. After that, the fault ride through strategy is proposed with consideration of equilibrium point. Finally, simulations using PSC based vector control for voltage source converter based high voltage dc transmission station (VSC-HVdc) are carried out to verify the analysis.

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