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Renewable power Generation and Future power systems Conference 2023 (RPG 2023 UK)

作者： Y. Sun Y. Guo F. Fan J. Fan G. Li Z. Wang X. Wu Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin People's Republic of China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin People's Republic of China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK State Grid Smart Grid Research Institute Beijing People's Republic of China

The modular multilevel converter-based high voltage direct current (MMC-HVDC) overhead lines transmission scheme is the preferred option for wind power integration, though it is susceptible to DC faults. To ensure the connection of a wind farm (WF) to the grid during DC faults, this paper proposes a coordinated control strategy for DC fault ride-through (FRT) based on the energy storage system configured inside the WF for wind power integration through a bipolar MMC-HVDC. In the case of an instantaneous DC fault, the non-fault pole is regulated to operate at full power state to maximise wind power transmission. The exceedance of available wind power outputs over the transmission capacity of the non-fault pole is then accurately allocated to the internal energy storage units (ESUs) of wind generators (WGs) in order to ensure the power balance of the system and reduce the state of charge variance of ESUs as soon as possible. In order to reduce the energy capacities of ESUs required to store the excessive wind power in the event of a permanent DC fault, the method of step-by-step removing WGs is adopted to ensure the system power remaining balanced when the internal ESUs of the disconnected WGs are out of operation. The model is developed and carried out on the PSCAD/EMTDC simulation platform to verify the effectiveness of the proposed control strategies.

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Research on Transforming Effect and Calculation Method of MMC Converter on AC / DC Harmonics

Research on Transforming Effect and Calculation Method of MM...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Cui, Liu Peng, Guangqiang He, Jingsong Wu, Jiyang Mao, Chizu Jiao, Ning Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System GuangZhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid GuangZhou China Maintenance Test Center Ehv Power Transmission Company Guangzhou China Csg Key Laboratory for Dc Transmission Equipment State Evaluation and Fault Diagnosis GuangZhou China Sichuan University College of Electrical Engineering and Information Technology Chengdu China

ISBN: (纸本)9781665414395

Modular multilevel converter (MMC) is currently the most concerned voltage source converter topology in the field of flexible direct current transmission (VSC-HVDC). Due to its non-linear characteristics, harmonic components will inevitably be generated in AC and DC systems, which may affect the operation of equipment and system, cause protection equipment to malfunction, and cause interference to neighboring communications. The MMC converter is a non-linear device, which can be considered as an amplifying modulator with voltage and current conversion functions. The AC and DC networks are coupled to each other through the MMC converter to generate dynamic harmonic interaction. In recent years, harmonic instability problems have appeared in many VSC-HVDC projects. Compared with other converter topologies, the transfer relationship of harmonics on the AC and DC sides of MMC converters has not been studied in depth. In this paper, by studying the AC/DC harmonic conversion characteristics of MMC converters, it reveals the conversion law of MMC converters between AC/DC harmonics;through theoretical derivation, the quantitative calculation method of MMC harmonic transmission process is given. PSCAD simulation results prove the correctness of the above results. © 2021 IEEE.

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A Multi-Stage Stochastic Dispatching Method for Electricity-Hydrogen Integrated Energy systems Driven by Model and Data

SSRN

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SSRN 2023年

作者： Yang, Zhixue Ren, Zhouyang Li, Hui Sun, Zhiyuan Feng, Jianbing The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China The State Key Laboratory of Internet of Things for Smart City Department of Electrical and Computer Engineering University of Macau 999078 China The State Key Laboratory of Internet of Things for Smart City University of Macau 999078 China Electric Power Research Institute of Guangxi Power Grid Co. Ltd Guangxi Nanning530000 China

To balance the contradiction between economy, security, and computational burden caused by the uncertainty of the electricity-hydrogen integrated energy systems (EH-IESs), a multi-stage coordinated dispatching framework of "day-ahead deterministic dispatching - online security monitoring - intra-day flexible correction" is proposed. The flexibility of the hydrogen energy system at the source-side and load-side is fully exploited and incorporated into the day-ahead dispatching model. To online monitor the future security of the EH-IESs operation in an uncertain environment, a security monitoring method is proposed by combining deep learning and Monte Carlo simulation. The predetermined dispatching scheme may not ensure the security of system operation due to the renewable energy uncertainty. Thus, an intra-day correction method based on chance-constrained model and multi-agent deep reinforcement learning is established to determine the correction scheme. Finally, the effectiveness and adaptability of the proposed method are demonstrated using the data of two EH-IESs based on the standard IEEE 57-node and IEEE 118-node test systems. © 2023, The Authors. All rights reserved.

关键词： Reinforcement learning

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Reliability Evaluation of a Regional Integrated Energy system Based on Complex Network Theory

Reliability Evaluation of a Regional Integrated Energy Syste...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Li, Jifeng Song, Kuizheng He, Xingtang Luo, Hao State Grid Liaoning Electric Power Supply Co. Ltd Dalian Electric Power Supply Company Dalian China State Grid Liaoning Electric Power Supply Co. Ltd Dispatching and Control Center Shenyang China Tianjin University Key Laboratory of the Ministry of Education on Smart Power Grids Tianjin China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control Renewable Energy Technology Jilin China

ISBN: (纸本)9781665414395

Most of the methods currently used to evaluate the reliability of integrated energy supply mainly consider such systems on a microgrid scale and focus on the effects of interactions among various energy carriers on the overall energy supply reliability of the system. As a result, it is difficult to analyze the system reliability in terms of its topology. Therefore, this paper proposes an approach for evaluating the reliability of a regional integrated energy system based on complex network theory. First, the feasibility of complex network theory application was analyzed based on the structural framework of the regional integrated energy system. Then, a weighted complex network model containing network characteristics was constructed by improving the 'distance' parameter in the complex network theory. Employing this model enabled the proposal of reliability evaluation indices, including nodes and the entire system, from the perspective of the system network topology. Finally, the effectiveness and applicability of the developed method were verified by constructing a test system. The application of complex network theory for reliability evaluations of regional integrated energy systems described in this paper provides guidance for planning and constructing future systems at the level of topology reliability. © 2021 IEEE.

关键词： Complex networks

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Generalized Study on Analysis and Suppression Strategy of Circulating Current for Modular Multilevel Cascaded Converters

Generalized Study on Analysis and Suppression Strategy of Ci...

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smart power & Internet Energy systems (SPIES), International Conference on

作者： Mengchao He Yunfei Xu Zhengang Lu Guoliang Zhao Minxiao Han State Key Laboratory of Alternate Electrical Power System With Renewable Energy Source North China Electric Power University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China State Key Laboratory of Electrical Equipment and Electrical Insulation Xi'an Jiaotong University Xi'an China

Modular multilevel cascaded converter (MMCC) is widely used in medium and high voltage energy conversion in power systems. Circulating current and branch power fluctuation are common problems in MMCC, and due to different topologies, submodule types and input/output properties, their characteristics vary greatly. In this paper, a general characteristic analysis method of circulating current based on MMCCs’ network topologies is proposed. On this basis, a general suppression strategy for circulating current is proposed, which is easy to implement and can be combined with a branch energy balance strategy. The correctness of the proposed theoretical analysis and control algorithm, which provides an important theoretical basis for the development and application of MMCC is verified by the PSCAD/EMTDC simulation platform.

关键词： Fluctuations Network topology Genetic expression High-voltage techniques Energy conversion Control systems Topology

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Structure optimization design and magneto-mechanical characteristics analysis of amorphous alloy with oriented silicon steel composite wound core

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SSRN 2023年

作者： Chen, Hao Li, Lin Song, Wenle Wang, Lei Yang, Fuyao Liu, Yang Pan, Ming Yang, Qingfu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China Cangzhou Power Supply Branch State Grid Hebei Electric Power Co. Ltd Cangzhou061000 China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing102209 China Shanghai Zhixin Electric Co. Ltd Shanghai200335 China

Three-dimensional wound cores are widely used in three-phase distribution transformer due to the symmetrical magnetic circuit structure. Amorphous alloy and oriented silicon steel are two kinds of ferromagnetic materials commonly used to make distribution transformer cores, each has own advantages and disadvantages in magnetic and mechanical characteristics. The amorphous alloy and oriented silicon steel composite core can synthesize the advantages of both. In this paper, a double-layer composite wound core (DCWC) structure is proposed and the corresponding dual nonlinear electric circuit and magnetic circuit coupling model is established. A DCWC optimization design method based on the free parameter scanning method is proposed by taking the percentage of oriented silicon steel in the composite core and the structure parameters as free variables. Based on the proposed optimization design method, a DCWC is designed and the experimental prototypes are manufactured. Further, the flux density distribution, core loss and mechanical vibration displacement of the DCWC are analyzed, and the effectiveness of the proposed method is verified by comparing with the measured results. © 2023, The Authors. All rights reserved.

关键词： Magnetos

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Big data service capability of enterprise-scale data middle platform

Big data service capability of enterprise-scale data middle ...

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Tsinghua University-IET electrical Engineering Academic Forum: Constructing Green and Sustainable Energy system 2021

作者： Chen, Lianfu Wang, Xuan Peng, Fang Liu, Shi State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China Department of Electrical Engineering Tsinghua University Beijing China Big Data Center of State Grid Corporation of China Beijing China

ISBN: (纸本)9781839536199

With the rapid development of technologies such as big data, cloud computing, Internet of things and artificial intelligence, electric power enterprises are faced with the strategic deployment of digital transformation. By upgrading IT architecture, power grid companies build the data middle platform, and separate the data operation and product technology from its front platform. Through service reusing and data sharing, the business capability can be shared, which providing technical support for power enterprises to serve a variety of complex business scenarios. This paper focuses on the architecture design of data middle platform in power grid companies, and analyzes its service capability. In addition, this paper sorts out the capability output framework of big data middle platform, and analyzes the data service requirements and application modellings for data middle platform in different business scenarios. © 2021 Institution of Engineering and Technology. All rights reserved.

关键词： Big data

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Control Strategy of Voltage Source Inverter Parallel Seamless Switching Based on Droop Control

Control Strategy of Voltage Source Inverter Parallel Seamles...

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International Conference on electrical Machines and systems (ICEMS)

作者： Lingyu Sun Wei Zhang Ming Zhong Yuqiang Wang Pengcheng Wang Feng Jiang Polytechnic Institute Zhejiang University Hangzhou China Inner Mongolia Power Research Institute Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Hohhot China College of Electrical Engineering Zhejiang University Hangzhou China

Due to the negative impact of the frequency fluctuation of the island microgrid during the parallel connection of voltage source inverters (VSI), a seamless switching parallel control based on droop control is proposed in this paper. This control strategy consists of variable step-length pre-synchronization control and droop coefficient smooth switching control. In addition, the influence of the phase angle during parallel connection is also analyzed. At the same time, the impact of system power redistribution on ROCOF during networking is also considered. Finally, the operation effect of the control strategy is verified by the simulation of two inverters connected in parallel.

关键词： Fluctuations Voltage source inverters Buildings Process control Switches Microgrids Control systems

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Research on Optimal Allocation of Network Loss for Centralized Renewable Energy Plants

Research on Optimal Allocation of Network Loss for Centraliz...

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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Wenxuan Tong Zhengang Lu Minxiao Han Guoliang Zhao Jufeng Li Fangyang Chai School of Electrical and Electronic Engineering North China Electric Power University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China North China University of Technology Beijing Engineering Research Center of Frequency Conversion Technology Beijing China

Hybrid power Station (HPS) will be one of the primary forms of the future power station to construct a safe and stable renewable power system. Due to the uneven regional spread of renewable energy resources, large-scale centralized development will become essential for renewable energy utilization. In this study, we investigate the optimal siting of HPS from the perspective of network loss optimization. First, we establish the basic model of network loss and propose this study's three basic assumptions through a three-bus radial network case study. Subsequently, to solve the optimal siting problem of centralized HPS, we propose a centralized HPS siting optimization method (CAM) and give a detailed application flowchart. Finally, we build an IEEE 14-bus model based on the MATLAB/Simulink platform to simulate and validate the CAM method and visualize the simulation data based on the IEEE 14-bus schematic, and the results obtained verify the effectiveness of the CAM method.

关键词： electrical engineering Renewable energy sources Flowcharts Optimization methods Mathematical models Data models Hybrid power systems

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A strategy for avoiding overload of AC line after blocking dc line in AC/DC hybrid grid 15

A strategy for avoiding overload of AC line after blocking d...

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15th International Conference on Developments in power system Protection, DPSP 2020

作者： Wang, Hao Kang, Xiaoning Dong, Xinzhou Shaanxi Key Laboratory of Smart Grid Xi'an Jiaotong University Xi'an China State Key Laboratory of Control and Simulation Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781713827894

The development of DC transmission technique is prompting the development of AC/DC hybrid grid. As a new form of the grid, AC/DC hybrid grid faces many challenges one of which is the effect of DC blocking on AC lines. This paper analyses the influence of DC blocking on AC lines. Based on the analysis, a control strategy using wide area information is proposed to avoid the severe overload of AC line after blocking a DC line. The proposed strategy increases the transmission power of normally operating DC line aiming to afford part or all of the transmission task of the blocked DC line. The test result obtained from simulation indicates that the proposed strategy can reduce the overload of AC line after blocking a DC line. © 2020 IET Conference Publications.

关键词： Transmissions

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