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A Distributed Photovoltaics Ordering grid-Connected Method for Analyzing Voltage Impact in Radial Distribution Networks

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Energy Engineering 2024年第10期121卷 2937-2959页

作者： Cuiping Li Kunqi Gao Can Chen Junhui Li Xiaoxiao Wang Yinchi Shao Xingxu Zhu Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin132012China State Grid Jibei Electric Power Co. Ltd.Electric Power Research InstituteBeijing100045China

In recent years,distributed photovoltaics(DPV)has ushered in a good development situation due to the advantages of pollution-free power generation,full utilization of the ground or roof of the installation site,and balancing a large number of loads ***,under the background of a large-scale DPV grid-connected to the county distribution network,an effective analysis method is needed to analyze its impact on the voltage of the distribution network in the early development stage of ***,a DPV orderly grid-connected method based on photovoltaics grid-connected order degree(PGOD)is *** method aims to orderly analyze the change of voltage in the distribution network when large-scale DPV will be ***,based on the voltagemagnitude sensitivity(VMS)index of the photovoltaics permitted grid-connected node and the acceptance of grid-connected node(AoGCN)index of other nodes in the network,thePGODindex is constructed to determine the photovoltaics permitted grid-connected node of the current photovoltaics grid-connected state ***,a photovoltaics orderly grid-connected model with a continuous updating state is constructed to obtain an orderly DPV grid-connected *** simulation results illustrate that the photovoltaics grid-connected order determined by this method based on PGOD can effectively analyze the voltage impact of large-scale photovoltaics grid-connected,and explore the internal factors and characteristics of the impact.

关键词： Radial distribution network distributed photovoltaics photovoltaics grid-connected order degree electrical distance photovoltaics action area

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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 14

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

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14th IEEE International Symposium on power Electronics for Distributed Generation Systems, PEDG 2023

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

ISBN: (纸本)9798350328233

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. © 2023 IEEE.

关键词： Voltage control

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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...

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2023 International Conference on power Energy Systems and Applications, ICoPESA 2023

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

ISBN: (纸本)9798350345605

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. © 2023 IEEE.

关键词： Frequency modulation

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Mechanism and data based modelling method of photovoltaic energy storage and transmission system 9

Mechanism and data based modelling method of photovoltaic en...

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9th International Symposium on Advances in Electrical, Electronics, and Computer Engineering, ISAEECE 2024

作者： Gu, Huaiguang Kou, Longze Gao, Yuqin Liu, Dong Liu, Dan Li, Linzhuo State Grid Smart Grid Research Institute Co. Ltd. Changping District Beijing102209 China State Key Laboratory of Advanced Power Transmission Technology Changping District Beijing102209 China Beijing Key Laboratory of DC Grid Technology and Simulation Changping District Beijing102209 China State Grid Hubei Electric Power Research Institute Hubei Wuhan430077 China North China Electric Power University Hebei Baoding071000 China

ISBN: (纸本)9781510683303

The power system model with power electronic equipment is usually a mechanism model, which needs to solve large-scale nonlinear differential algebraic equations. The solution process requires a large number of iterations, with a large amount of calculation. To address these issues in the mechanism model, a mechanism and data based modelling method based on artificial intelligence algorithms is proposed. This method replaces some complex mechanism models with data models, which can reduce the problem of requiring a large number of iterations for power electronic devices in the mechanism model. By controlling the sampling time, the accuracy control of the mechanism and data based model is achieved, finally, the mechanism and data based model of photovoltaic energy storage and transmission system is completed, improving the running speed. © 2024 SPIE ·

关键词： Data modeling Solar energy Modeling Photovoltaics Batteries Solar cells Electronic components

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Identifiability Analysis of Load Model Parameters by Estimating Confidential Intervals

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CSEE Journal of power and Energy Systems 2023年第5期9卷 1666-1675页

作者： Xinran Zhang Chao Lu Ying Wang Qiantu Ruan Hongbo Ye Weihong Wang the School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China. the State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua UniversityBeijing 100084China School of Technology Beijing Forestry UniversityBeijing 100083China the State Grid Shanghai Electric Power Company Shanghai 200122China

The identification of load model parameters from practical measurement data has become an essential method to build load models for power system simulation,analysis and *** practical situations,the accuracy of the load model parameters identification results is impacted by data quality and measurement accuracy,which leads to the problem of *** this paper,an identifiability analysis methodology of load model parameters,by estimating the confidential intervals(CIs)of the parameters,is *** load model structure and the combined optimization and regression method to identify the parameters are first ***,the definition and analysis method of identifiability are *** CIs of the parameters are estimated through the profile likelihood method,based on which a practical identifiability index(PII)is defined to quantitatively evaluate ***,the effectiveness of the proposed analysis approach is validated by the case study results in a practical provincial power *** results show that the impact of various disturbance magnitudes,measurement errors and data length can all be reflected by the proposed ***,the proposed PII can provide guidance in data length selection in practical load model identification situations.

关键词： Confidential interval Load modeling parameter estimation practical identifiability

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A SOLUTION METHOD OF ILL-CONDITIONED MATRIX IN ELECTROMAGNETIC TRANSIENT simulation BASED ON REGULARIZATION ALGORITHM 12

A SOLUTION METHOD OF ILL-CONDITIONED MATRIX IN ELECTROMAGNET...

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12th Annual Meeting of CSEE Study Committee of HVdc and power Electronics, HVdc 2023

作者： Gao, Lu Lin, Junjie Su, Minghui Lin, Chang Ji, Feng Wei, Bingtao State Grid Smart Grid Research Institute Co. Ltd Beijing China Laboratory of DC Grid Technology & Simulation Address Beijing China State Key Laboratory of Advanced Transmission Technology Beijing China

ISBN: (纸本)9781839539848

The electromagnetic transient simulation of power system is related to solving ill-conditioned matrix equations, which can not get satisfactory numerical results by the conventional method. In this paper, the regularization method is used to solve the ill-conditioned matrix equations in electromagnetic transient simulation. The numerical results show that the regularization method can solve the ill-conditioned matrix in electromagnetic transient simulation precisely. © The Institution of Engineering & technology 2023.

关键词： Numerical methods

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Control Strategy of Direct-Driven PMSM Wind Turbines Participating in Fast Frequency Response of power grid 6

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

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6th International Conference on Energy, Electrical and power Engineering, CEEPE 2023

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

ISBN: (纸本)9798350348279

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. © 2023 IEEE.

关键词： Frequency response

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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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2023 International Conference on power System technology, powerCon 2023

作者： Gu, Huaiguang Kou, Longze Zhu, Lin Gao, Yuqin Gao, Yang Xiong, Ping State Key Laboratory of Advanced Transmission Technology China Beijing Key Laboratory of Dc Power Grid Technology and Simulation China State Grid Smart Grid Research Institute Co. LTD. Changping Beijing102209 China State Grid Hubei Electric Power Research Institute Hongshan District Hubei Province Wuhan City430015 China

ISBN: (纸本)9798350300222

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. © 2023 IEEE.

关键词： Electric power distribution

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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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2023 International Conference on power System technology, powerCon 2023

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

ISBN: (纸本)9798350300222

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. © 2023 IEEE.

关键词： Energy absorption

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Optimal Allocation Strategy of Frequency Modulation power for Multiple Energy Storage Systems Considering Dual Constraints of Frequency Modulation Cost and Frequency Modulation Capability

Optimal Allocation Strategy of Frequency Modulation Power fo...

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2023 IEEE International Conference on power Science and technology, ICPST 2023

作者： Peng, Yongming Si, Wenbo Zhao, Haiji Lv, Changlin Liu, Chengzhe Xu, Fei Hao, Ling Li, Junhui Northeast Branch of State Grid Corporation of China Shenyang China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin China State Key Laboratory of Power System and Power Generation Equipment Control and Simulation Beijing China

ISBN: (纸本)9798350311358

Aiming at the power allocation problem of multiple energy storage power stations distributed at different locations in the regional power grid participating in frequency modulation services, a frequency modulation power optimization allocation strategy for multiple energy storage systems considering the dual constraints of frequency modulation cost and frequency modulation capability is proposed. Firstly, a multi-objective optimization allocation model for frequency modulation power is constructed with the minimum frequency modulation cost and minimum deviation of the state of charge (SOC) for energy storage power plants. Secondly, using Pareto based multi-objective genetic algorithm (MOGA) to solve the model, introduce adaptive weight coefficients and fuzzy membership functions for each objective function regarding the frequency regulation demand of the power grid and the deviation of the SOC of energy storage stations, construct a comprehensive satisfaction function to make decisions on the most advantageous points on the Pareto frontier, in order to obtain the optimal output of each energy storage station that can adapt to the frequency regulation requirements of the power grid. Finally, simulation analysis was conducted on the proposed strategy in this article, and the results showed that: The proposed strategy not only enhances the frequency regulation economy of the regional power grid, but also helps to restore the SOC of the energy storage power station. © 2023 IEEE.

关键词： Frequency modulation

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