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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Yong, Tao Liu, Jing Li, Wenxiao Yang, Guanjian Tang, Mengyang Miao, Yiru Key Laboratory of Smart Grid and Intelligent Control of Nanchong Southwest Petroleum University Nanchong637001 China State Grid Jiangsu Electric Power Co. LTD. Extra-High Voltage Branch Company Nanjing211002 China College of Electrical and Information Engineering in Hunan University Changsha410082 China State Grid Sichuan Electric Power Company Chengdu610041 China

ISBN: (纸本)9789819904075

Due to nonlinear factors such as dead-time and tube voltage drop, low-order harmonics will be injected into the output voltage of the inverter, resulting in fifth and seventh harmonic distortion of stator current and increasing torque ripple. At the same time, the natural frequency of inductor motor used in electrical vehicle is low, when the motor runs at medium and high speed, the low harmonic frequency of the current coincides with the natural frequency of the motor, resulting in resonance. To solve the above problems, firstly, the simulation and test method of the natural frequency of the IM is studied, and the natural frequency range of the IM is determined. Then, based on the analysis of the harmonic distortion characteristics caused by dead-time and tube voltage drop, a sixth harmonic controller is added to the current inner loop of the vector control system after rotor flux orientation (d-q coordinate), and the design method of the controller parameters is studied. Finally, the simulation model is established, which shows that the theoretical analysis and the proposed harmonic control method are correct and feasible. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Harmonic distortion

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Methodology for Regional Carbon Emission Projections and Scenario Analysis Based on the STIRPAT Model 25

Methodology for Regional Carbon Emission Projections and Sce...

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25th IEEE China Conference on System Simulation Technology and its Application, CCSSTA 2024

作者： Xu, Xihao Kong, Xiangyu Wang, Yang Liu, Jiancun Wang, Yubo Yu, Fanfan Tianjin University of Technology Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin China Tianjin University Key Laboratory of Smart Grid Tianjin China China State Grid Tianjin Electric Power Company Tianjin China

ISBN: (纸本)9798350366600

Analyzing the factors that influence carbon emission reduction and predicting the peak year of carbon emissions will help the region clarify the direction of emission reduction efforts and take the lead in achieving carbon peak and carbon neutrality. This paper proposes a regional dual-carbon target and path planning method. Firstly, an indicator system is established to explore the relationship between regional carbon emissions and factors such as the economy, population, and energy efficiency consumption. Indicators with higher correlation are selected through gray correlation analysis. Then, the Stochastic Impacts by Regression on Population, Affluence, and Technology (STIRPAT) model is constructed to predict carbon emissions in the region. Lastly, a scenario design is conducted for the dual-carbon target, predicting carbon emissions under different scenarios while considering carbon sinks. The results are analyzed to finalize the regional dual-carbon target and path. © 2024 IEEE.

关键词： Carbon capture and utilization

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Distributed Power Service Restoration Method of Distribution Network with Soft Open Point

Distributed Power Service Restoration Method of Distribution...

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2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

作者： Sun, Shoujing Cong, Wei Sheng, Yaru Chen, Ming Wei, Zhen Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China Tianjin University Key Laboratory of Smart Grid of Ministry of Education Tianjin China Qingdao Power Supply Company Shandong Electric Power Company State Grid Qingdao China

ISBN: (纸本)9781728143033

Soft open point (SOP) is applied to the power service restoration of the distribution network because of the advantages of flexible control mode and optimizing the operation of the distribution network. Taking advantage of parallel collaborative between independent peer smart terminals unit (STU) in distribution network and information interaction ways of working, distributed power service restoration method of distribution network considering soft open point is put forward, which brings the superiority of SOP in the aspect of power service restoration into full play and avoids the problem of large information collection and calculation in the centralized power service restoration method. Firstly, the structure, control mode and power service restoration model of SOP are introduced, and then the distributed power service restoration method of distribution network with SOP is described, which mainly includes distributed network topology search and the expression and calculation of constraint conditions. Finally, a numerical simulation is carried out to verify the effectiveness of the proposed method. © 2020 IEEE.

关键词： Restoration

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Quantitative analysis for coupling between frequency dynamic and power angle oscillation 4

Quantitative analysis for coupling between frequency dynamic...

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4th IEEE International Conference on Power, intelligent Computing and Systems, ICPICS 2022

作者： Liu, Fusuo Wang, Chao Ma, Ruicong Li, Wei Cao, Yongji Chang, Haijun Zhang, Hengxu Gao, Zhimin State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation State Grid Electric Power Research Institute Nanjing China NARI Group Corporation State Grid Electric Power Research Institute Nanjing China Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China

ISBN: (数字)9781665467735

ISBN: (纸本)9781665467735

With the increasing penetration of power electronic devices, the behaviors of the power system become more and more complex. This paper analyzes the coupling characteristics between the frequency dynamics and power angle oscillation. The mechanism of frequency response and power angle oscillation is derived. The evaluation indexes are proposed to quantify the frequency response, power angle oscillation, and coupling characteristics. The coupling degree of the frequency dynamics and power angle oscillation is depicted by the Pearson correlation coefficient. The impacts of power angle oscillation on the frequency response are attained through time-domain simulation and theoretical analysis. The results show that the proposed evaluation indexes are effective to quantify the coupling characteristics. Additionally, there is positive correlation between the frequency dynamics and power angle oscillation. © 2022 IEEE.

关键词： Frequency response

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Dynamic reconfiguration of three-phase imbalanced distribution networks considering soft open points

Energy Conversion and Economics

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Energy Conversion and Economics 2023年第5期4卷 364-377页

作者： Ji, Xingquan Zhang, Xuan Ye, Pingfeng Zhang, Yumin Li, Guanglei Gong, Zheng College of Electrical Engineering and Automation Shandong University of Science and Technology Shandong Qingdao China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Shandong Jinan China State Grid Weifang Power Supply Company Shandong Weifang China

The characteristics of three-phase imbalances are present in medium- and low-voltage distribution networks. Integrating single-phase distributed generation (DG) exacerbates network imbalances, resulting in increased power losses and potential safety hazards. To address these issues, a dynamic reconfiguration strategy (DNR) for three-phase imbalanced distribution networks, considering soft open points (SOP), has been proposed. The objective is to alleviate the three-phase imbalance and minimize the operational costs of the distribution network. Within the reconfiguration strategy, the constraints of DG current imbalance in practical system operations are considered. A three-phase imbalanced DNR model that simultaneously considers the constraints of the SOP and DG current imbalances is introduced. This model aims to optimize the operation of all devices, including the SOP, to address the overall imbalance of the distribution network. This enables the authors to transform the non-linear model into a mixed-integer linear programming (MILP) model, significantly improving the solution efficiency. To validate the proposed strategy, simulations of a modified IEEE 34-node distribution system and an actual 78-node distribution system were conducted. The results demonstrate that this strategy offers significant economic benefits and ensures the security of the distribution network. © 2023 The Authors. Energy Conversion and Economics published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology and the State grid Economic & Technological Research Institute Co., Ltd.

关键词： Dynamic models

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Carbon Emission Calculation and Low Carbon Transition Path Optimization Method for Electric Power Industry 25

Carbon Emission Calculation and Low Carbon Transition Path O...

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25th IEEE China Conference on System Simulation Technology and its Application, CCSSTA 2024

作者： Yu, Fanfan Kong, Xiangyu Luo, Shuai Wu, Shunyu Wang, Yubo Gao, Yi Tianjin University of Technology Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin China Tianjin University Key Laboratory of Smart Grid Tianjin China Economic and Technical Research Institute of State Grid Tianjin Electric Power Company Tianjin China

ISBN: (纸本)9798350366600

With economic development, the energy and power industry must balance power supply growth and carbon reduction requirements. To achieve the goal of 'double carbon', the power system needs to be transformed into green and low-carbon, and accurate carbon emission accounting has become a critical support. Due to the significant differences between cities and regions, emission reduction strategies vary. To this end, the article firstly clarifies the carbon emission accounting boundary of power generation enterprises, establishes a carbon emission accounting model for the power industry based on the IPCC inventory method of fuel consumption, and secondly constructs an enterprise low-carbon transition planning model by integrating technological, economic, environmental and other factors, researches and analyzes the path of power generation enterprises to achieve carbon-neutral transition by 2060, and simulates different low-carbon transition scenarios. The results show that achieving carbon neutrality appropriately in advance is beneficial to power generation enterprises to a certain extent, but advancing the process of carbon neutrality too early will lead to soaring costs. In addition,future policies will push forward the scale of installed energy storage, and enterprises should make good use of technical and resource reserves. The power industry needs to formulate appropriate low-carbon transformation strategies according to its reality to ensure that it realizes a win-win situation regarding economic and social benefits while realizing the goal of carbon neutrality. © 2024 IEEE.

关键词： Low emission

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Optimization Method for Flexible Dispatch of Source, grid, Load and Storage Considering Different Photovoltaic Penetration Rates 25

Optimization Method for Flexible Dispatch of Source, Grid, L...

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25th IEEE China Conference on System Simulation Technology and its Application, CCSSTA 2024

作者： Wang, Man Wang, Chunjie Kong, Xiangyu Yao, Haoyang Niu, Yuan Wang, Chao Tianjin University of Technology Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin China Tianjin University Key Laboratory of Smart Grid Tianjin China State Grid Tianjin Electric Power Company Ninghe Power Supply Branch Tianjin China

ISBN: (纸本)9798350366600

As the scale of grid connection of renewable resources such as wind and solar continues to increase, it is difficult to meet system needs by relying solely on the existing single fast peak-shaving power source. Therefore, this paper aims at the power system scheduling problem under different photovoltaic penetration rates. First, the multi-dimensional characteristics of photovoltaics are modeled. Then, a system scheduling model for the interaction of four types of resources: conventional units, grid elasticity, load response, and energy storage is established. Finally, to minimize the system peak-shaving cost, the optimal system scheduling strategy under different photovoltaic penetration rates is obtained, and the dynamic matching of different photovoltaic penetration rates with the peak-shaving capacity of the power system is completed. A system scheduling strategy that can meet different photovoltaic penetration rates is proposed to ensure the power system's balance of supply and demand and improve resource utilization. © 2024 IEEE.

关键词： grid interaction between source load and storage new energy grid connection optimal power grid dispatching

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Research on Dead-Time Compensation Method for Low Voltage Delta Connected Induction Motor 1

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Yong, Tao Liu, Jing Liu, Yechun Tang, Mengyang Qiao, Hui Miao, Yiru Key Laboratory of Smart Grid and Intelligent Control of Nanchong Southwest Petroleum University Nanchong637001 China State Grid Jiangsu Electric Power Co. LTD. Extra-High Voltage Branch Company Nanjing211002 China College of Electrical and Information Engineering in Hunan University Changsha410082 China The Sixth Design Institute of Machinery Industry Co. Ltd. Zhengzhou450007 China

ISBN: (数字)9789819904082

ISBN: (纸本)9789819904075

Low voltage as 48 V and large power induction motor will be largely used in hybrid and pure electric vehicle (EV) because of its very high safety. But the winding cables are so thick that assembly of neutral point is very inconvenient and delta connection has to be applied. However, some new problems such as loop current, harmonics, dead-time arise with delta connection. Aiming at the dead-time problem of this induction motor, the characteristics of dead time effect were analyzed in detail, and the two phases average voltage compensation method was derived. Analysis indicate that voltage error caused by snubber circuit under small current leads to the current to be clamped in the vicinity of zero, and presents a compensation method for this error. The earlier crossing zero compensation and a simple method to determine the direction of current are presented to solve zero current clamping effect and the complicate algorithms are avoided. The simulation and experiment results verify the validity and feasibility of these methods. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Induction motors

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Energy Storage-Based Active Support Strategy for grid Frequency of grid-Configured Offshore Wind Farms 25

Energy Storage-Based Active Support Strategy for Grid Freque...

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25th IEEE China Conference on System Simulation Technology and its Application, CCSSTA 2024

作者： Zhang, Baoyi Kong, Xiangyu Liu, Jiancun Sun, Wen Yang, Yue Yang, Wenlong Tianjin University of Technology Tianjin Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control China Tianjin University Tianjin Key Laboratory of Smart Grid China Electric Power Research Institute Guangdong Power Grid Co. Ltd. Guangdong China

ISBN: (纸本)9798350366600

With the new energy of large-scale grid-connected, the scale of offshore wind farms is also getting bigger and bigger. Offshore wind turbines are difficult to provide frequency support to the grid when they are fed directly via flex, and the weak grid operation capacity will be poor. Therefore, this paper proposes a grid-connected control method for offshore wind turbines based on virtual synchronous generator (VSG) technology. Enable offshore wind turbines with good frequency dynamic response capability and inertia support capability. At the same time, through the configuration of energy storage devices for wind turbines to provide the energy needed to support the grid, grid-configured offshore wind turbines smoothly realize active support to assist the grid-constructing type wind turbine in providing frequency support. Finally, the effectiveness of the proposed control method is verified by simulation using Matlab/Simulink software. © 2024 IEEE.

关键词： Offshore wind farms

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Self-Healing Optimization of Power grid under High Penetration of New Energy 25

Self-Healing Optimization of Power Grid under High Penetrati...

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25th IEEE China Conference on System Simulation Technology and its Application, CCSSTA 2024

作者： Jin, Zelong Yang, Bohan Kong, Xiangyu Zheng, Meiling Liu, Jiancun Tianjin University of Technology Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin China Tianjin University Key Laboratory of Smart Grid Tianjin China Tianjin University School of Electrical and Information Engineering Tianjin China

ISBN: (纸本)9798350366600

In order to address the problem of high penetration of new energy into the grid, which brings huge intermittency and volatility to the distribution network, and to overcome the shortcomings of the traditional methods such as genetic algorithm and whale algorithm, which are limited and unable In order to construct the most suitable scenarios, this paper considers a distribution network system containing a significant quantity of distributed photovoltaic energy under a high penetration rate. It then builds a stochastic planning model for self-healing of the distribution network by constructing constraint functions and objective functions. The construction of the constraint function and objective function enables the development of a self-healing stochastic planning model for the distribution network. This model is solved using the scenario tree stochastic method and the improved PSO algorithm. Finally, the feasibility of the self-healing optimization method proposed in this paper is verified by applying it to four typical scenarios to demonstrate the limitations of the traditional method. In brief, the methodologies presented in this paper offer superior alternatives to traditional methods. The optimization solution is more expedient and precise, with a discernible positive impact on the self-repair capability of the distribution network and secure operation. © 2024 IEEE.

关键词： Power distribution networks

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