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Coordinated Control Strategy of New Energy power Generation System with Hybrid Energy Storage Unit

Energy Engineering 2025年第1期122卷 167-184页

作者： Yun Zhang ZifenHan Biao Tian Ning Chen Yi Fan School of Mechano-Electronic Engineering Xidian UniversityXi’an710071China Electric power Control Center State Grid Gansu Electric Power CompanyLanzhou730030China Electric power Control Center State Grid Gansu Electric Power Company Zhangye Power Supply BranchZhangye734000China

The new energy power generation is becoming increasingly important in the power *** as photovoltaic power generation has become a research hotspot,however,due to the characteristics of light radiation changes,photovoltaic power generation is unstable and random,resulting in a low utilization rate and directly affecting the stability of the power *** solve this problem,this paper proposes a coordinated control strategy for a newenergy power generation system with a hybrid energy storage unit based on the lithium iron phosphate-supercapacitor hybrid energy storage ***,the variational mode decomposition algorithm is used to separate the high and low frequencies of the power signal,which is conducive to the rapid and accurate suppression of the power fluctuation of the energy storage ***,the fuzzy control algorithm is introduced to balance the power between energy *** this paper,the actual data is used for simulation,and the simulation results show that the strategy realizes the effective suppression of the bus voltage fluctuation and the accurate control of the internal state of the energy storage unit,effectively avoiding problems such as overshoot and over-discharge,and can significantly improve the stability of the photovoltaic power generation systemand the stability of the Direct Current *** is of great significance to promote the development of collaborative control technology for photovoltaic hybrid energy storage units.

关键词： Photovoltaic power suppression hybrid energy storage unit variationalmodal decomposition fuzzy control power distribution control

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A Verifiable Trust-Based CP-ABE Access Control Scheme for Cloud-Assisted Renewable Energy Systems

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Computers, Materials & Continua 2025年第1期82卷 1211-1232页

作者： Jiyu Zhang Kehe Wu Ruomeng Yan Zheng Tian Yizhen Sun Yuxi Wu Yaogong Guo Department of Control and Computer Engineering North China Electric Power UniversityBeijing102206China State Grid Information&Communication company of Hunan Electric power Corporation Changsha410118China State Grid Hunan Electric power Corporation Chenzhou power supply branch Chenzhou423000China

Renewable Energy Systems(RES)provide a sustainable solution to climate warming and environmental pollution by enhancing stability and reliability through status acquisition and analysis on cloud platforms and intelligent processing on edge servers(ES).However,securely distributing encrypted data stored in the cloud to terminals that meet decryption requirements has become a prominent research ***,managing attributes,including addition,deletion,and modification,is a crucial issue in the access control scheme for *** address these security concerns,a trust-based ciphertext-policy attribute-based encryption(CP-ABE)device access control scheme is proposed for RES(TB-CP-ABE).This scheme effectivelymanages the distribution and control of encrypted data on the cloud through robust attribute key *** introducing trust management mechanisms and outsourced decryption technology,the ES system can effectively assess and manage the trust worthiness of terminal devices,ensuring that only trusted devices can participate in data exchange and access sensitive ***,the ES system dynamically evaluates trust scores to set decryption trust thresholds,thereby regulating device data access permissions and enhancing the system’s *** validate the security of the proposed TB-CP-ABE against chosen plaintext attacks,a comprehensive formal security analysis is conducted using the widely accepted random oraclemodel under the decisional q-Bilinear Diffie-Hellman Exponent(q-BDHE)***,comparative analysis with other schemes demonstrates that the TB-CP-ABE scheme cuts energy/communication costs by 43%,and scaleswell with rising terminals,maintaining average latency below 50ms,ensuring real-time service *** proposed scheme not only provides newinsights for the secure management of RES but also lays a foundation for future secure energy solutions.

关键词： Access control renewable energy systems(RES) ciphertext-policy attribute-based encryption(CP-ABE) security

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Energy harvesting technology for AC overhead insulated transmission line based on electric field induction

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High Voltage 2024年第4期9卷 816-825页

作者： Le Zhou Hongwei Liu Kun Zuo Kuo Shang School of Electrical and Electronic Engineering North China Electric Power UniversityBeijingChina Electric power company of Sichuan Province Tianfu power supply company ChengduSichuanChina Changde power supply branch State Grid Hunan Electric Power Company LimitedChangdeHunanChina

To solve the problem of the energy harvesting(EEH)effect of the condition monitoring devices power supply on the transmission line is not *** authors designed three kinds of EEH schemes based on AC electric field induction,which can effectively improve the output power of load power *** EEH principle of each scheme was analysed in detail,and the influence factors such as the shape of outer energy harvester,capacitance compensation and impedance matching characteristics were ***,the experiment showed that 140.9 mW of power was obtained in direct-mode field EEH when the line voltage level was 10 *** high-potential field EEH mode obtained 4.1 mW of *** harvesting effect of the inner energy harvester with the same potential as the aluminium wire was obviously better,and 30.7 mW of power was ***,based on the third mode,when the load resistance was 2200Ω,the rectifier received 23.7 mW DC *** experimental results are in agreement with the theoretical analysis,which verifies the effectiveness of the electric field induction power supply technology.

关键词： field harvesting mode

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Influence of thermal ageing on high-field polarisation characteristics and conductivity behaviour of submarine polymeric cables insulation

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High Voltage 2023年第1期8卷 138-148页

作者： Xize Dai Jian Hao Gian Carlo Montanari Zheng Jian Ruijin Liao Xinlong Zheng State Key Laboratory of power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Department of Energy Aalborg UniversityAalborgDenmark Center for Advanced power Systems Florida State UniversityTallahasseeFloridaUSA Shinan power supply branch company of State Grid Chongqing Electric power company NananChina Zhoushan power supply branch company of State Grid Zhejiang Electric power company ZhoushanChina

Diagnosing insulation intrinsic ageing is essential for preventing insulation failure of submarine cables,and in case of failure,helping in any decision about maintenance *** this study,a novel aged cable diagnosis approach based on high-voltage frequency domain spectroscopy(HV-FDS)with broader frequency width is proposed to analyse the high-field polarisation characteristics and conductivity behaviour of 500 kV submarine polymeric cables insulation,aiming to support the evaluation of overall insulation *** measurement principle of HV-FDS and relaxation mechanism are stated,and then focus is on studying the extent of change of polarisation and conduction properties of submarine cables insulation as a function of ageing stress and ***,the high-field polarisation characteristics and conductivity behaviour are discussed in-depth based on the carrier transport and trap ***,the novel diagnostic indicator based on the high-field characteristics is extracted to quantify the thermal ageing state of submarine cables *** show that the high-field polarisation characteristics and conductivity behaviour seem to become sensitive diagnostic quantities if measured at reasonably high voltage,which are able to reveal mechanisms associated with thermo-oxidative ageing as that generated in the testing procedure considered in this *** is considerably higher than that experienced in typical dielectric spectroscopy approaches.

关键词： behaviour insulation characteristics

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Operational optimization of a building-level integrated energy system considering additional potential benefits of energy storage

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Protection and Control of Modern power Systems 2021年第1期6卷 55-64页

作者： Sai Liu Cheng Zhou Haomin Guo Qingxin Shi Tiancheng E.Song Ian Schomer Yu Liu Maintenance branch company State Grid Jiangsu Electric Power Co.Ltd.Nanjing211102Jiangsu ProvinceChina kunshan power supply branch company State Grid Jiangsu Electric Power Co.Ltd.Kunshan215300Jiangsu ProvinceChina Xiamen power supply company State Grid Fujian Electric Power Co.Ltd.Xiamen361004Fujian ProvinceChina Enliten Lab University of TennesseeKnoxvilleTN37996USA School of Electrical Engineering Southeast UniversityNanjing210096Jiangsu ProvinceChina

As a key component of an integrated energy system(IES),energy storage can effectively alleviate the problem of the times between energy production and *** the benefits of energy storage can improve the competitiveness of multi-energy *** paper proposes a method for day-ahead operation optimization of a building-level integrated energy system(BIES)considering additional potential benefits of energy *** on the characteristics of peak-shaving and valley-filling of energy storage,and further consideration of the changes in the system’s load and real-time electricity price,a model of additional potential benefits of energy storage is *** at the lowest total operating cost,a bi-level optimal operational model for day-ahead operation of BIES is developed.A case analysis of different dispatch strategies verifies that the addition of the proposed battery scheduling strategy improves economic *** results demonstrate that the model can exploit energy storage’s potential,further optimize the power output of BIES and reduce the economic cost.

关键词： Building-level integrated energy system Energy storage Additional potential benefits Bi-level optimization

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Optimal layout model of feeder automation equipment oriented to the type of fault detection and local action

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Protection and Control of Modern power Systems 2023年第1期8卷 15-29页

作者： Ruizhi Chen Xihong Li Yanbo Chen Bishan power supply branch of Chongqing Electric power company Chong-qingBishanChina North China Electric power University BeijingChina

In feeder automation transformation there are difficulties in equipment and location *** help with this,an optimal layout model of feeder automation equipment oriented to the type of fault detection and local action is *** analyzes the coordination relationship of the three most common types of automation equipment,i.e.,fault indicator,over-current trip switch and non-voltage trip switch in the fault handling process,and the explicit expres-sions of power outage time caused by a fault on different layouts of the above three types of equipment are *** constraints of power supply reliability and the goal of minimizing the sum of equipment-related capital invest-ment and power interruption cost,a mixed-integer quadratic programming model for optimal layout is established,in which the functional failure probability of equipment is linearized using the 3δprinciple in ***,the basic characteristics of the proposed model are illustrated by different scenarios on the IEEE RBTS-BUS6 *** can not only take into account fault location and fault isolation to enhance user power consumption perception,but also can guide precise investment to improve the operational quality and efficiency of a power company.

关键词： Feeder automation Equipment layout optimization power outage time Explicit expression Mixed integer quadratic programming model Functional failure probability of equipment

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Potential Assessment of Spatial Correlation to Improve Maximum Distributed PV Hosting Capacity of Distribution Networks

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Journal of Modern power Systems and Clean Energy 2021年第4期9卷 800-810页

作者： Han Wu Yue Yuan Junpeng Zhu Kejun Qian Yundai Xu College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China Nanjing Institute of Technology Nanjing 211167China Suzhou power supply branch of State Grid Jiangsu Electric power company Suzhou 215004China

Successful distributed photovoltaic (PV) planning now requires a hosting capacity assessment process that accounts for an appropriate model of PV output and its uncertainty. This paper explores how the PV hosting capacity of distribution networks can be increased by means of spatial correlation among distributed PV outputs. To achieve this, a novel PV hosting capacity assessment method is proposed to account for arbitrary geographically dispersed distributed PVs. In this method, the empirical relation between the spatial correlation coefficient and distance is fitted by historical data in one place and then applied to model the joint probability distribution of PV outputs at a neighboring location. To derive the PV hosting capacity at candidate locations, a stochastic PV hosting capacity assessment model that aims to maximize the PV hosting capacity under thermal and voltage constraints is proposed. Benders decomposition algorithm is also employed to reduce the computational cost associated with the numerous sampling scenarios. Finally, a rural 59-bus distribution network in Suzhou, China, is used to demonstrate the effectiveness of the proposed PV hosting capacity assessment methodology and the significant benefits obtained by increasing geographical distance.

关键词： Copula mixed-integer cone programming PV capacity assessment spatial correlation stochastic program

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Optimization of cantilevered piezoelectric energy harvester with a fixed resonance frequency

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Science China(Technological Sciences) 2014年第6期57卷 1093-1100页

作者： LIANG Zhu XU ChunDong REN Bo DI WenNing LI Long LUO HaoSu CHEN Zhen SU Jun Key Laboratory of Inorganic Functional Material and Device Shanghai Institute of CeramicsChinese Academy of Sciences University of Chinese Academy of Sciences Shibei power supply branch Shanghai Municipal Electric Power Company

Piezoelectric energy harvesting is widely used to scavenge vibration energy in the *** some vibration sources with fixed frequency,cantilevered harvester can generate the energy effectively,so the optimization theory for cantilevered harvester in such an application is *** this article,we present the theoretical and experimental studies of the cantilevered piezoelectric energy harvester with a fixed resonance *** analytical model based on energy method is used to estimate the open-circuit voltage and generated *** that the harvester may be subjected to the static force or steady-state sinusoidal vibration excitation,static and dynamic analysis is performed for device structure to achieve efficient *** the analysis,the effects of geometrical dimension on the energy harvesting performance are discussed ***,a prototype is designed and fabricated using(1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3(PMN-PT)single crystal with ultrahigh piezoelectric properties and coupling *** of the cantilever with different clamped length are evaluated under sinusoidal vibration excitation,proving the good consistency between experimental results and theoretical *** established analysis can provide useful guidelines for the structure design of cantilevered piezoelectric energy harvester with a fixed resonance frequency.

关键词： piezoelectric energy harvester cantilever

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Situation Awareness and Sensitivity Analysis for Absorption of Grid-connected Renewable Energy power Generation Integrating Robust Optimization and Radial Basis Function Neural Network

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Journal of Modern power Systems and Clean Energy 2023年第6期11卷 1795-1803页

作者： Ziqi Zhang Zhong Chen Qi Zhao Yi Wang Jiang Tian School of Electrical Engineering Southeast UniversityNanjingChina Suzhou power supply branch of the State Grid Jiangsu Electric power company SuzhouChina NARI Group Corporation Ltd. (State Grid Electric Power Research Institute Ltd.)NanjingChina

The significance of situation awareness(SA) in power systems has increased to enhance the utilization of gridconnected renewable energy power generation(REPG). This paper proposes a real-time calculation architecture based on the integration of robust optimization(RO) and artificial intelligence. First, the time-series simulation of the REPG consumption capacity is carried out under the current grid operating conditions. RO is employed in this simulation, given the randomness of the REPG output and the grid load. Then, the radial basis function neural network(RBFNN) is trained with the results under different parameters using the artificial fish swarm algorithm(AFSA), enabling the neural network(NN) to be the replacement for the time-series simulation model. The trained NN can quickly perceive the REPG absorption situation within the predefined grid structure and period. Moreover, the Sobol' method is adopted to conduct the global sensitivity analysis for different parameters based on the input-output samples obtained by the trained NN. Finally, the simulation experiments based on the modified IEEE 14-bus system prove the real-time performance and accuracy of the proposed SA architecture.

关键词： Renewable energy radial basis function neural network robust optimization sensitivity analysis situation awareness

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Proposed methodology for online frequency response analysis based on magnetic coupling to detect winding deformations in transformers

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High Voltage 2020年第3期5卷 343-349页

作者： Yangchun Cheng Jiangang Bi Wenzhi Chang Yuan Xu Xiaohua Pan Xianwei Ma Shuai Chang State Key Laboratory of Alternate Electrical power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206People's Republic of China Institute of High Voltage Technology China Electric Power Research InstituteBeijing 100192People's Republic of China State Grid Shandong Electric power company Linyi Power Supply CompanyLinyi 276000People's Republic of China State Grid Beijing Electric power company Cable branch Beijing 100020People's Republic of China Changzhou power supply company State Grid Jiangsu Electric Power CompanyChangzhou 213000People's Republic of China

Frequency response analysis is widely used as a method for the offline diagnosis of winding deformations in power *** apply it to a working transformer,people need to determine how to inject the excitation signal and measure the response signal for windings that bear a rated voltage and *** this study,a method to obtain the frequency response curve online is *** uses the principle of magnetic field coupling to inject a frequency sweep signal into the windings through a Rogowski *** Rogowski coil sensor placed at the root of a high-voltage bushing is used to measure the response current *** on a 72.5 kV bushing show that metal accessories of the bushing have no influence on the injection or the *** feasibility of this method was verified by experiments on charged 110/35/10 kV transformers at a factory and a working 35 kV transformer in a power *** results show that it is safe to install the Rogowski coil at the root of the high-voltage *** excitation signal can be injected into live windings and the response signal is *** electromagnetic power frequency noise can be reduced and the frequency response curve can be measured online.

关键词： winding coupling excitation

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