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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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A Risk-Averse Just-In-Time Scheme for Learning-Based Operation of Microgrids With Coupled Electricity-Hydrogen-Ammonia Under Uncertainties

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IEEE Transactions on Sustainable Energy 2025年

作者： Li, Longyan Ning, Chao Pan, Guangsheng Zhang, Leiqi Gu, Wei Zhao, Liang Du, Wenli Shahidehpour, Mohammad Shanghai Jiao Tong University Department of Automation Shanghai200240 China Ministry of Education of China Key Laboratory of System Control and Information Processing Shanghai200240 China School of Electrical Engineering Southeast University Nanjing210096 China Zhejiang Key Laboratory of Distributed Generations and Microgrid Technology State Grid Zhejiang Electric Power Research Institute Hangzhou310014 China Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education East China University of Science and Technology China Department of Electrical and Computer Engineering Illinois Institute of Technology ChicagoIL60616 United States

This paper proposes a Risk-Averse Just-In-Time (RAJIT) operation scheme for Ammonia-Hydrogen-based Micro-grids (AHMGs) to boost electricity-hydrogen-ammonia coupling under uncertainties. First, an off-grid AHMG model is developed, featuring a novel multi-mode ammonia synthesis process and a hydrogen-ammonia dual gas turbine with tunable feed-in ratios. Subsequently, a state-behavior mapping strategy linking hydrogen storage levels with the operation modes of ammonia synthesis is established to prevent cost-ineffective shutdowns. The proposed model substantially improves operational flexibility but results in a challenging nonlinear fractional program. Based upon this model, a data-driven RAJIT scheme is developed for the real-time rolling optimization of AHMGs. Unlike conventional one-size-fits-all schemes using one optimization method throughout, the data-driven RAJIT intelligently switches between cost-effective deterministic optimization and risk-averse online-learning distributionally robust optimization depending on actual risk profiles, thus capitalizing on the respective strengths of these two optimization methods. To facilitate the solution of the resulting nonlinear program, we develop an equivalent-reformulation-based solution methodology by leveraging a constraint-tightening technique. Numerical simulations demonstrate that the proposed scheme guarantees safety and yields an overall cost reduction up to 14.6% compared with several state-of-the-art methods. © 2025 IEEE.

关键词： Ammonia

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Development and prospect of direct‐current circuit breaker in China

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High Voltage 2021年第1期6卷 1-15页

作者： Weijiang Chen Rong Zeng Junjia He Yi Wu Xiaoguang Wei Taixun Fang Zhanqing Yu Zhao Yuan Yifei Wu Wandi Zhou Bing Yang Lu Qu STATE GRID Corporation of China BeijingChina Department of Electrical Engineering Key Laboratory of Control and Simulation of Power System and Generation EquipmentTsinghua UniversityBeijingChina School of Electric and Electronic Engineering Huazhong University of Science&TechnologyWuhanChina School of Electrical Engineering Xi'an Jiaotong UniversityXi'anChina Global Energy Interconnection Research Institute Co. LtdBeijingChina NR Electric Co. LtdNanjingChina

The direct‐current circuit breaker(DCCB)is the most ideal choice for DC fault isolation in DC *** a late start,China's research and development on the DCCB have made outstanding *** article provides a brief glance of current China's DCCB development *** begins by sorting out the technical route according to the topology of *** it systematically summarises both mechanical and hybrid DCCBs with focussing on the aspects of topology structure and principle,key technology and characteristics,prototype development and *** is apparent that Chinese scientists and engineers confronted the worldwide problem of large capacity DC breaking,and put forward a comprehensive solution which consists of an innovative topology structure based on coupled negative voltage circuit,breaking throughs on the key technologies such as highly controllable and reliable fault current commutation,millisecond‐level ultra‐fast and efficient electromagnetic repulsion mechanism,high tolerance and high stability power electronic switch,low residual voltage and fast response energy consumption device,*** article states that the world's first set of hybrid high‐voltage(HV)DCCB,and the first set of mechanical HV DCCB have been *** DCCBs will soon be deployed to the DC grids which have the highest voltage levels therefore require the strongest breaking *** achievements are leading the world in the development and application of *** article also discusses the overall development trends of DCCB in the areas of new topologies,key techno-logical breakthroughs and application scenarios,*** discussions serve as references for DCCB's future technological advancement and its ever‐expanding applications.

关键词： breaking breakthrough discussions

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A Hybrid Control Scheme for the Dual-Active-Bridge dc-dc Converter with Fast Dynamic Response and Measurement Noise Suppression

A Hybrid Control Scheme for the Dual-Active-Bridge dc-dc Con...

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IEEE International Conference on power and Energy systems (ICPES)

作者： Ming Zhong Qilun Ao Wei Zhang Yuan Fan Weiqi Meng Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Inner Mongolia Power Research Institute Hohhot China Jiangsu Pulixun Power Technology Co. Ltd. Nantong China School of Electrical and Information Engineering Tianjin University Tianjin China

ISBN: (纸本)9781665413268

For dual-active-bridge (DAB) dc-dc converter, the disturbances of the output voltage caused by the measurement noises are inevitable in the model-based control (MBC) schemes. Compared with the MBC strategy, the single-voltage-loop control (SVLC) method has the ability to suppress the measurement noise and provide more stable output voltage. However, the SVLC method always results in slow dynamic response. To achieve excellent performance under both dynamic and steady state conditions, this paper proposes a hybrid control scheme to combine the advantages of the MBC strategy and the SVLC method. When the load disturbance happens, the MBC scheme is selected for maintaining the output voltage during the transits. Once the required output voltage is obtained, the dominant control scheme is switched to the SVLC method. Taking the direct-power-control (DPC) scheme as an example, some experimental results are showed to verify the effectiveness of the proposed hybrid control strategy.

关键词： Voltage measurement Noise reduction DC-DC power converters Switches Control systems Hybrid power systems Time measurement

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Current Quality Enhancement of PV String Inverter under Unbalanced Fault in Distribution grid

Current Quality Enhancement of PV String Inverter under Unba...

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IEEE International Conference on power and Energy systems (ICPES)

作者： Wei Zhang Qilun Ao Ming Zhong Yuan Fan Weiqi Meng Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Inner Mongolia Power Research Institute Hohhot China Jiangsu Pulixun Power Technology Co. Ltd. Nantong China School of Electrical and Information Engineering Tianjin University Tianjin China

ISBN: (纸本)9781665413268

PV systems are increasingly connected to the power system, applying the increasing impact to the distribution grid, where single-phase sources and loads can lead to significant unbalance and cause significant interference to three-phase inverters. To ensure the proper operation of three-phase inverters, this paper studies the control system for string inverters under the unbalanced voltage and ensures the current quality. To control the positive sequence and negative sequence current simultaneously, a dual vector current controller is applied in this paper. The DC link voltage is controlled in the first stage. Besides, this paper uses a PI+R controller to reduce the second-order harmonic of DC link voltage. To verify the performance of these strategies, simulation results are provided.

关键词： simulation Interference power system harmonics Harmonic analysis Control systems Inverters Voltage control

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An Admittance Matrix Model of Thyristor-Based Rectifier for Harmonic Analysis

An Admittance Matrix Model of Thyristor-Based Rectifier for ...

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IEEE International Conference on power and Energy systems (ICPES)

ISBN: (纸本)9781665413268

The analysis of nonlinear loads can help improve the filter design and guide the power-converters-based harmonic compensation. However, the analysis requires accurate detailed models to well describe the behavior of nonlinear loads. This paper develops a detailed admittance matrix model for thyristor-based converter, which is a widely used industrial non-linear load. This model can accurately describe the harmonic characteristics of thyristor-based converters, including the coupling between harmonic voltages and currents. A detailed derivation is provided, and a comprehensive evaluation of the accuracy is performed under different conditions.

关键词： Couplings Analytical models Firing Rectifiers Harmonic analysis Admittance Matrix converters

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Hierarchical Dispatch Method for Integrated Heat and power systems Based on a Feasible Region of Boundary Variables

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CSEE Journal of power and Energy systems 2020年第3期6卷 543-553页

作者： Tuo Jiang Yong Min Weichun Ge Lei Chen Qun Chen Fei Xu Huanhuan Luo Guiping Zhou State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Liaoning Electric Power Supply Co.Ltd. Shenyang 110000China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

Fully utilizing the flexibility provided by a district heating system(DHS)can promote wind power accommodation for an electric power system(EPS).However,for privacy or communication reasons,existing power and heat dispatch methods are not suitable for practical *** this paper,a general math formulation of the hierarchical dispatch method is proposed to coordinate EPS and DHS operators based on the feasible region of boundary variables(FRBV),and a method based on the simplicial approximation approach is proposed to obtain a conservative FRBV approximation of a DHS.A simulation based on a real 41-node DHS is constructed to determine the factors that may impact the boundaries of the FRBV,and then the performance of the simplicial approximation approach is displayed by visualizing the approximation process for the FRBV,and finally three dispatch methods are compared to show the advantages of the proposed hierarchical dispatch method.

关键词： District heating system feasible region hierarchical dispatch method integrated heat and power system simplicial approximation approach

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Malfunction Analysis of Generator Third Harmonic Stator Grounding Protection 4

Malfunction Analysis of Generator Third Harmonic Stator Grou...

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4th International Conference on power and Renewable Energy, ICPRE 2019

作者： Jun, Tao Minfu, A. Xiaoxi, Wu Ming, Zhong Inner Mongolia Electric Power Research Institute Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Hohhot China

ISBN: (纸本)9781728145747

The third-harmonic stator grounding protection is widely used in China to monitor the stator insulation of the generator. This protection would send wrong signal in engineering applications. This paper introduces the principle and implementation method of the third harmonic stator grounding protection. According to the generation mechanism of the third harmonic electric potential of the generator, this paper analysis the Various influencing factors of ratio calculation principle, and fixed value optimization advice of the third harmonic stator grounding protection is proposed. Fixed value optimization in engineering applications also recommended. © 2019 IEEE.

关键词： Stators

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Secure Ubiquitous Wireless Communication Solution for power Distribution Internet of Things in smart grid

Secure Ubiquitous Wireless Communication Solution for Power ...

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Consumer Electronics and Computer Engineering (ICCECE), 2021 IEEE International Conference on

作者： Liming Chen Siliang Suo Xiaoyun Kuang Yang Cao Wenwei Tao Electrical Power Research Institute China Southern Power Grid Guangzhou China Key Laboratory of Guangdong Electric Power System Network Security Enterprise Guangzhou China China Southern Power Grid Guangzhou China

ISBN: (数字)9781728183190

ISBN: (纸本)9781728183206

With rapid advancement of smart grid as well as Internet of Things (IoT), current power distribution communication network faces the challenges of satisfying the emerging data transmission requirements of ubiquitous secure coverage for distributed power services. This paper focuses on secure ubiquitous wireless communication solution for power distribution Internet of Things (PD_IoT) in smart grid. Detailed secure ubiquitous wireless communication networking topology is presented, and integrated encryption and communication device is developed. The proposed solution supports several State Secret cryptographic algorithm including SM1/SM2/SM3/SM4 as well as forward and reverse isolation functions, thus achieving secure wireless communication for PD_IoT services.

关键词： Wireless communication Network topology power distribution Ubiquitous computing smart grids Encryption Internet of Things

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Space Charge Transport of $\boldsymbol{\text{Al}_2 \mathrm{O}_3}$ /Silicone Rubber Composites Under Thermal Aging

Space Charge Transport of $\boldsymbol{\text{Al}_2 \mathrm{O...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Yunxiao Zhang Chenning Yan Kai Wu Yuanxiang Zhou Tianfeng Zhang College of Electrical Engineering and Automation Fuzhou University Fuzhou Fujian China Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi China Electric Power Research Institute Anhui Electric Power Company of State Grid Hefei China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407519

Silicone rubber (SIR) has been widely used in the insulation of cable accessories due to its excellent performance. In this paper, pure SIR and nano $\boldsymbol{\text{Al}_2 \mathrm{O}_3 / \text{SIR}}$ composites are thermally aged for 0–80 days at $\boldsymbol{200^{\circ} \mathrm{C}}$ . The effects of long-term thermal aging on the space charge transport are analyzed. The results show that with the increase of thermal aging time, the accumulation of heteropolar charge of pure SIR and nano $\boldsymbol{\text{Al}_{2}\mathrm{O}_{3}/\text{SIR}}$ composites gradually decreases and changes to the accumulation of homopolar charge. Compared with pure SIR, the space charge accumulation of $\boldsymbol{\text{Al}_{2}\mathrm{O}_{3}/\text{SIR}}$ composites decreases significantly and changes little with the increase of thermal aging time. It is believed that when doped nano $\boldsymbol{\text{Al}_{2}\mathrm{O}_{3}}$ in SIR, the increase of carrier mobility and the introduction of metal oxides reacting with fallen free radicals to form stable compounds both lead to less space charge accumulation of $\boldsymbol{\text{Al}_{2}\mathrm{O}_{3}/\text{SIR}}$ composites.

关键词： Nanocomposites Impurities Metals High-voltage techniques Aging Space charge Thermal analysis

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