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2023 power Electronics and power System Conference, PEPSC 2023

作者： Zheng, Weike Wang, Haijiao Xie, Bao Mao, Meiqin China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China Photovoltaic System Engineering Research Center Ministry of Education Hefei University of Technology Hefei China

ISBN: (纸本)9798350341294

Both the phase-locked loop (PLL) and the common coupling point (PCC) voltage feedforward may have impacts on the inverter system stability in weak grid. Therefore, a hybrid impedance reshaping control strategy is proposed in the paper. Firstly, the inverter impedance model is established. Next, the system stability is analyzed under weak grid, reflecting on the influence of PLL and the PCC voltage feedforward. Then, to improve the inverter system stability, the band-pass filter is added to the feedforward branch of PCC voltage, since it can attenuate the influence of unstable factors. Moreover, a new phase-locked loop structure containing a first-order decoupled complex filter is proposed, taking into account the fundamental positive voltage extraction characteristics of the first-order decoupled complex filter. The parameters of the hybrid impedance reshaping strategy are designed in detail. Finally, simulation is carried out to prove the theory analysis and hybrid impedance reshaping strategy in the paper. © 2023 IEEE.

关键词： Phase locked loops

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simulation analysis of grid-configured energy storage devices involved in primary FM of power grid

Simulation analysis of grid-configured energy storage device...

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Energy and power Engineering, control Engineering (EPECE), International Conference on

作者： Qian Zhang Hanning Li Xiangjun Li Xuecui Jia State Key Laboratory of Operationand Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China

ISBN: (数字)9798350366099

ISBN: (纸本)9798350366105

With the increasing penetration of new energy sources in the power grid, the problem of power fluctuation in the grid has become increasingly serious. It may be difficult to respond to power fluctuations in time by only relying on traditional generating units to balance the grid power. The converter adopts a constructive network-type control strategy, so that the energy storage device also has the ability to participate in the primary frequency regulation of the grid. In this paper, the principle of disturbed power distribution in the grid and the new power system inertia composition are discussed, and the contribution of the energy storage system to the grid system inertia is analyzed. Finally, a grid load frequency control model is constructed in Simulink to verify the ability of the grid-configured energy storage system to rapidly output power to stabilize the system frequency in the primary FM.

关键词： Time-frequency analysis Fluctuations power system stability Stability analysis Regulation power grids Frequency control

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control Strategy of Voltage Source Energy Storage Converter Based on Virtual Inertia

Control Strategy of Voltage Source Energy Storage Converter ...

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Energy Engineering and power systems (EEPS), International Conference on

作者： Tianyu Zhang Xiaoyu Liu Xiangjun Li Shouping Xu State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China

ISBN: (数字)9798350375138

ISBN: (纸本)9798350375145

In order to respond to the goal of “double carbon”, the new power system faces the problems of low inertia, weak damping and poor voltage support ability. The traditional sagging control technology can not improve the transient response characteristics of the system, and the active support ability is weak. Therefore, a GFM control strategy based on virtual inertia control is proposed to optimize the control of virtual synchronous generator and improve the dynamic stability of the system. Based on Matlab/Simulink, a mesh converter model was established to verify the applicability of the strategy, and fault simulation was carried out in PSD-BPA to verify the role of active voltage support.

关键词： Damping Transient response power system dynamics power system stability Synchronous generators Stability analysis power grids Synchronization Voltage control Energy storage

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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 ...

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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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A reduced Ammonia/China Stage-VI diesel mechanism for dual-fuel engine simulations: Development, validation and CFD implementation

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International Journal of Hydrogen Energy 2025年 144卷 359-373页

作者： Liping Yang Rui Wang Feng Jiang Liang Guo Sifan Li Jiqiang Zhang College of Power and Energy Engineering Harbin Engineering University Harbin 150001 China Harbin Boiler Company Limited Harbin 150046 China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130025 China

Ammonia (NH 3 ) is a hydrogen energy carrier, and NH 3 /diesel dual-fuel engines enhance NH 3 flame propagation and combustion stability while reducing emissions. A reduced NH 3 /diesel mechanism is crucial for dual-fuel engine combustion simulation. However, previous studies using Non-dominated Sorting Genetic Algorithm II (NSGA-II) with manual selection were affected by decision-maker subjectivity. In this study, the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) was used to improve decision consistency, repeatability, and explain-ability. A novel NSGA-II/TOPSIS hybrid method was first used to develop a reduced mechanism for China Stage-VI diesel under wide engine conditions. Sensitivity analysis was used to identify the key NH 3 /diesel auto-ignition reactions. Validated against experimental data, the optimized mechanism (90 species, 400 reactions) achieved an average of 12 % higher accuracy in predicting NH 3 /China Stage-VI diesel blends ignition delay times across all tested ammonia energy ratios (10–90 %) compared to detailed mechanisms, and successfully simulated real engine combustion conditions.

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Application and Practice of Digital Twin Technology in Monitoring Status of power Equipment in Converter Valve Hall

Application and Practice of Digital Twin Technology in Monit...

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Intelligent Communication and Computer Engineering (ICICCE), International Conference on

作者： He Yongsheng Deng Baojia Lu Zongxiang Zhang Shiling Dai Liangjun State Grid Chongqing Electric Power Company Electric Power Research Institute Deptartment of Electrical Engineering Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipment

The internal power equipment of ultrahigh voltage converter valve hall is numerous and complex in structure, involving the various information elements such as the temperature and vibration. Moreover, the gas inside ultra-high voltage converter bushing is SF6 gas. Under the current over-load condition of the converter bushing, SF6 gas will decompose. This article focuses on the SF6 gas equipment inside the ultrahigh pressure converter valve hall as the research object, and analyzes specific types and content of SF6 gas decomposition products. In order to effectively detect gas content in the digital twin model of the converter transformer bushing, the new portable SF6 gas chromatograph, laser detection technology and device for HF gas, and partial discharge detection technology research using the acoustic electric coupling method are carried out, providing the effective means for onsite detection of hidden faults in operating equipment. Research has shown the digital twin technology can effectively detect the absorption spectra of gases such as O2, H20, CO, CO2, CF4, SO2, H2S, SOF2, and SO2F2. On the other hand, through digital twin partial discharge detection technology, it is effectively found that the SO2 inside the UHV converter sleeve is 29μL/L, H2S is 4μL/L, CO is 36μL/L, HF=0, detected SO2 and H2S components, determined as the insulation heating defect. The research results of paper provide theoretical and data support for operation status monitoring of SF6 gas insulated power equipment inside the ultra-high voltage converter valve hall.

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Electromagnetic Transient Modeling and Real-time simulation Based on state-space Equations

Electromagnetic Transient Modeling and Real-time Simulation ...

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New Energy and power Engineering (ICNEPE), International Conference on

作者： Tianyu Guo Binjiang Hu Hui Luo Liang Tu Yanjun Zhao YuFeng Hu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid China China Southern Power Grid Co. Ltd China

ISBN: (数字)9798331516086

ISBN: (纸本)9798331516093

Due to the different output characteristics of different components of the power system, the simulation results of its output deviate from the actual situation. Therefore, the electromagnetic transient modeling and real-time simulation based on the state space equation are proposed. From the perspective of rectifier, DC transmission line, inverter and control system, the composition of the state space model of the complete power system and the output characteristics of each part in the operation process are analyzed. In the test results, the design method can achieve a stable fit between the real-time simulation results of voltage waveform containing two VSC modules and the actual situation.

关键词： simulation systems operation power system dynamics power system stability Aerospace electronics Mathematical models Real-time systems Smart grids Nonlinear dynamical systems Transient analysis

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Methodology for Capacity Credit Evaluation of Physical and Virtual Energy Storage in Decarbonized power System

arXiv

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arXiv 2023年

作者： Qi, Ning Li, Peng Cheng, Lin Zhang, Ziyi Huang, Wenrui Yang, Weiwei State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Co. Ltd Tongzhou District Beijing101100 China

Energy storage (ES) and virtual energy storage (VES) are key components to realizing power system decarbonization. Although ES and VES have been proven to deliver various types of grid services, little work has so far provided a systematical framework for quantifying their adequacy contribution and credible capacity value while incorporating human and market behavior. Therefore, this manuscript proposed a novel evaluation framework to evaluate the capacity credit (CC) of ES and VES. To address the system capacity inadequacy and market behavior of storage, a two-stage coordinated dispatch is proposed to achieve the trade-off between day-ahead self-energy management of resources and efficient adjustment to real-time failures. And we further modeled the human behavior with storage operations and incorporate two types of decision-independent uncertainties (DIUs) (operate state and self-consumption) and one type of decision-dependent uncertainty (DDUs) (available capacity) into the proposed dispatch. Furthermore, novel reliability and CC indices (e.g., equivalent physical storage capacity (EPSC)) are introduced to evaluate the practical and theoretical adequacy contribution of ES and VES, as well as the ability to displace generation and physical storage while maintaining equivalent system adequacy. Exhaustive case studies based on the IEEE RTS-79 system and real-world data verify the significant consequence (10%-70% overestimated CC) of overlooking DIUs and DDUs in the previous works, while the proposed method outperforms other and can generate a credible and realistic result. Finally, we investigate key factors affecting the adequacy contribution of ES and VES, and reasonable suggestions are provided for better flexibility utilization of ES and VES in decarbonized power system. © 2023, CC BY.

关键词： Behavioral research

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Driving Style Recognition Considering Different Driving Scenes 6

Driving Style Recognition Considering Different Driving Scen...

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6th CAA International Conference on Vehicular control and Intelligence, CVCI 2022

作者： Zhang, Lubing Li, Guopeng Song, Yedong Wang, Jialin Chu, Hongqing Chen, Hong Electronic Control Research Institute Weichai Power Co. Ltd. Weifang China Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China School of Automotive Studies Tongji University Shanghai China

ISBN: (数字)9781665453745

ISBN: (纸本)9781665453745

Correctly identifying the surrounding driving scenes and drivers' driving styles plays an essential role in improving driving safety. This paper presents a driving style recognition algorithm considering the differences in driving scenes. The driving data of 38 randomly recruited drivers are collected by a T-box device installed on a truck. The collected data is clustered into five categories according to different velocity and acceleration values, representing five different driving scenes. Some characteristics that can reflect driving styles are calculated in each scene, and they are as the input of SOM+KMeans and the GMM model for driving style recognition. And the classification results of the two methods are compared in each driving scene, which has an average 91.7% recognition consistency rate. Our driving style identification model combines the characteristics of different driving scenes and can reflect the impact of road scenes on driving style. © 2022 IEEE.

关键词： Filtering Roads Clustering algorithms Safety Character recognition Vehicles

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Improved control of Grid-Connected Photovoltaic and Energy Storage System Based on Virtual Resistance 2

Improved Control of Grid-Connected Photovoltaic and Energy S...

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2nd IEEE International power Electronics and Application Symposium, PEAS 2023

作者： Kang, Jiahua Dong, Wei Xu, Jinming Diao, Hanxu Lv, Zhenhua Xie, Shaojun College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China State Grid Jiangsu Electric Power Co. LTD. Research Institute Nanjing China

ISBN: (纸本)9798350313765

In practical applications, the photovoltaic and energy storage (PV&ES) system can reduce grid-connected power fluctuations and help solve the problems caused by the large amount of distributed photovoltaic generation connected to the grid. However, the presence of non-ideal factors such as rich voltage harmonics and large grid impedance in the grid may lead to the destabilization of the PV&ES system, so analyzing the stability of the PV&ES system under complex grid is needed. The emphasis of this paper is on the modeling and stability analysis of the PV&ES system. The accurate model is established by using the harmonic linearization, and stability analysis under different grid impedances is carried out using impedance analysis. As proved, the PV&ES system has better stability under weak grid, but poor stability under strong grid with lower phase margin. Based on this, a virtual resistance-based method for improving the PV&ES system output impedance characteristics is proposed to achieve better stability under different grid impedance conditions. The validity and feasibility of the above analysis are confirmed through simulation of three-phase grid-connected inverters prototype. © 2023 IEEE.

关键词： frequency coupling impedance modeling photovoltaic and energy storage system (PV&ES) weak grid

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