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SSRN 2024年

作者： Duan, Juntao Li, Yuanzheng Li, Yang Liu, Zhiwei Zhao, Yong School of Artificial Intelligence and Automation Key Laboratory on Image Information Processing and Intelligent Control of Ministry of Education Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China

The increasing processing demands of information technology (IT) workloads cause the booming of data centers (DCs) in recent years. The servers in the DC emit much heat when processing the IT workloads and thus the DC temperature rises. The power consumption when controlling the DC temperature using the air conditioning (A/C) of the DC is high, which leads to expensive power bills. To reduce the power cost, using renewable energy (RE) to power DC has raised much attention in recent years. However, the intermittency of RE and the uncertainties of outside temperature pose operational challenges. Therefore, in this paper, a data-driven statistical-feasibility-based robust rolling optimization framework for the operation of hydrogen-DC microgrid (H2-DCMG) is proposed to control the DC temperature considering these uncertainties and the intermittency of RE. In the framework, the hydrogen energy storage system (HESS) is introduced to deal with the intermittency of RE, and robust optimization (RO) is adopted to deal with the uncertainty of outside temperature. The statistical feasibility is introduced into the framework to decrease the conservatism of RO, through relaxing the DC temperature constraints without harming normal DC operations. Moreover, we propose the Statistical-Guarantee-based Vertex Link (SGVL) algorithm to construct a polyhedron uncertain set of outside temperatures that can ensure the results of dispatch are economical and satisfy statistical feasibility. The constructed polyhedron uncertain set is linear, which reduces computational complexity in solving. A case study based on the real-world temperature dataset verifies the superiority of the SGVL algorithm on the aspect of the economic cost. It further validates the effectiveness of the proposed robust optimization framework for DC temperature control. © 2024, The Authors. All rights reserved.

关键词： Air conditioning

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Research on Partition Method of Distributed Photovoltaic Cluster Based on Modularity Index and Absorption Ability

Research on Partition Method of Distributed Photovoltaic Clu...

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Smart Grids and energy systems (SGES), International Conference on

作者： Tao Meng Xiangyu Lv Chenggang Li Dexin Li Yifu Zhang Xiangdong Meng Electric Power Research Institute State Grid Jilin Electric Power Co. Ltd. Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education School of Electrical Engineering Northeast Electric Power University Changchun Jilin China

To achieve large-scale renewable energy, grid friendly coordination and the need to maximize grid-connection and consumption functions, the clustering method has become a forward-looking solution for distribution network planning, construction and dispatching control. In this paper, the modularity index and active power balance index based on electrical distance are taken as the comprehensive classification index. Then genetic algorithm is introduced to divide the distributed PV cluster in the distribution network. Finally, a 10kV distribution system is taken as an example, and the distributed photovoltaic cluster planning is simulated and analyzed, which proves that the distributed photovoltaic cluster division method is effective.

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Integrated Multi-Port Flexible Voltage Clamp Circuit Breaker with Dc Chopper Applied to the Receiving End of Mmc-Hvdc system

SSRN

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SSRN 2022年

作者： Li, Guoqing Song, Yuheng Bian, Jing Wang, Yanxu Yan, Kefei Li, Menghan Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University JL Jilin132012 China Baoding Power Supply Company of State Grid Jilin Electric Power Co. Ltd HB 071000 China

Given the wide application of DC grids, the relevant protection equipment of power grids must be improved during the fault period. This study proposes an integrated multiport flexible voltage clamp circuit breaker with a DC chopper, acting on the receiving end converter, which can solve the DC short circuit fault and surplus power because of a low voltage fault. As a DC circuit breaker, the branch outputs different levels of voltage by selecting different gears based on the rising trend of fault current. The voltage clamping principle and thyristor semi-control are used to remove the fault, and the voltage-clamped branch forms an LC oscillation circuit with the fault point, and the thyristors turn off when crossing zero. Then, using the flow direction of the capacitive current based on reclosing, turn on the reverse thyristors and determine the fault type. The number of input sub modules is changed by low-voltage level detection as a DC chopper to assist AC low-voltage fault ride through such that the voltage at both ends of the energy dissipation resistance changes, which can consume the surplus power from the sending end converter and minimize the impact of low-voltage fault on the power transmission capacity of the system. Finally, the validity and applicability of the three terminal DC network models in PSCAD/EMTDC is confirmed, and the two types of faults are analyzed. Through fault current, system voltage, branch voltage comparison, and AC side power transmission analysis, the equipment can replace multiple conventional circuit breakers and traditional energy-consuming equipment, further expanding the economy of the DC system. © 2022, The Authors. All rights reserved.

关键词： Electric circuit breakers

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A Simultaneous Wireless Information and power Transfer-based Multi-hop Clustering Routing Protocol for RF energy Harvesting-Cognitive Radio Sensor Networks

Journal of Network Intelligence

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Journal of Network Intelligence 2023年第3期8卷 991-1007页

作者： Wang, Ji-Hong Su, Xi-Tong Ge, Yi-Yang Chen, Yeh-Cheng Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University China School of Electrical Engineering Northeast Electric Power University 169 Changchun Road Jilin132012 China Department of Computer Science University of California DavisCA001313 United States

Radio frequency energy harvesting (RF EH) and clustering are promising solutions to solve the energy constraint problem faced by cognitive radio sensor networks (CRSNs). However, study on clustering routing protocol design for RF EH-CRSNs is still in the initial stage, and there lacks of solutions for inter-cluster routing problem, which restricts the network scalability. In addition, unbalanced harvested energy and energy consumption may result in premature death of nodes in key position, which will significantly reduce the network performance. In this paper, a simultaneous wireless information and power transfer (SWIPT)-based multi-hop clustering routing protocol (SMCRP) is proposed for RF EH-CRSNs to well balance the residual energy distribution among nodes and postpone node death. Apart from the RF energy harvested from dedicated or ambi-ent energy sources, the energy obtained through intra-cluster and inter-cluster SWIPT is also considered to facilitate high-quality cluster heads selection, cluster formation and inter-cluster route establishment. power splitting ratio is derived based on the residual energy of CRSNs nodes and their energy consumption to enable effective implementation of SWIPT in CRSNs. simulation results show that SMCRP is effective in balancing the residual energy distribution among nodes and improving node sustainability. To be specific, compared with current clustering protocols, the network lifetime is extended by 64.07% while intra-cluster energy balance degree and network energy balance degree are improved by 15.1% and 7.82%, respectively. © 2023 ISSN 2414-8105 (Online).

关键词： Cognitive radio

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Investigating the transient torque of turbo-generators in a power system integrating wind farms

Investigating the transient torque of turbo-generators in a ...

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8th renewable power Generation Conference (RPG 2019)

作者： Bowen Yang Gangui Yan Xiaorong Xie Yanhui Wang Jian Tang Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China State Grid East Mongolia Electric Power Supply Co. Ltd. Hohhot China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

The renewable energy sources connected to the grid will cause the power system to oscillate and even affect neighbouring turbo-generators. For example, the wind turbines and their converter control systems may cause shaft torsional vibration in the steam turbine units, which affects the safety of the system. Therefore, it is of significance to investigate the transient torque of turbo-generators in a power system integrating wind farms. This paper takes a power plant in Inner Mongolia area of China as the case, the power of which is transmitted via the AC/DC hybrid power system with wind and thermal power. A typical equivalent system model of the wind-thermal-bundled access network is established firstly. Consider setting the fault on the line with series capacitor compensation and observe units' torque variation. Then the impact on sub-synchronous resonance (SSR) characteristics from many factors was investigated through the time-domain simulation, including the unit combination mode (including the long-term accessed DFIGs condition), the fault type and position, the system equivalent impedance, the fault starting/clearing time and the mechanical mutual damping coefficient of shafting, etc. Finally, the influence of each factor on transient torque is summarized, and the inner associations between the shaft torsional vibration in the turbo-generators and the converter-based wind turbines are clarified.

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An Improved Virtual Impedance Droop control of Three-Port Converter Interfaced Hybrid energy Storage systems

An Improved Virtual Impedance Droop Control of Three-Port Co...

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International Conference on power Electronics systems and Applications (ICPESA)

作者： Sisi Liang Xiaolin Wang Yuanmao Ye Yao Ma School of Automation Guangdong University of Technology Guangzhou China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin China Hainan Electric Power School Hainan Power Grid Co. Ltd. Haikou China

ISBN: (数字)9798350365801

ISBN: (纸本)9798350365818

The power allocation of hybrid energy storage system (HESS) is crucial for the development of hydrogen fuel cell vehicles (HFCVs). To improve the operational efficiency, a triple active bridge (TAB) converter is designed as the interface circuit, which can transfer power bi-directionally and isolate the voltage in a wide range of transient conditions. This paper proposes a droop control strategy based on adjustable virtual impedance for HESS. The fuel cell (FC) side converter adopts the virtual resistance and inductance droop (VRID) control, while the Lithium battery side converter uses the virtual capacitance droop (VCD) control. The Lithium battery can quickly absorb the high-frequency component of the system power fluctuation, which improves the dynamic response of the system. Moreover, the value of the virtual resistance is adjusted according to the operating state of the circuit, which helps to enhance the power quality and eliminate the voltage deviations caused by conventional droop control. The proposed control strategy and analytical results are validated by both simulations and experiments.

关键词： Resistance Analytical models Fluctuations Fuel cells Lithium batteries Hybrid power systems Impedance

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Research on Distributed Photovoltaic Marketization Trading Model Considering Auxiliary Services

Research on Distributed Photovoltaic Marketization Trading M...

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

作者： Tao Meng Dexin Li Chenggang Li Wei Wang State Grid Jilin Electric Power Co. Ltd. Electric Power Research Institute Changchun Jilin Province China The Key Laboratory of Modern Power System Simulation and Control Ministry of Education Renewable Energy Technology (Northeast Electric Power University) Jilin Jilin Province China

ISBN: (数字)9798350366914

ISBN: (纸本)9798350366921

Constrained by the features of distributed photovoltaic (PV) power generation, as more distributed photovoltaic systems connect to the power grid, the demand for auxiliary services resulting from PV integration into the distribution network will significantly increase. Thus, when conducting market-oriented transactions, it becomes essential to consider not only the electricity market but also the auxiliary services required for distributed photovoltaics. This paper discusses the future distributed photovoltaic trading platform, price models, and the pricing and allocation of auxiliary services, aiming to achieve a virtuous cycle in distributed photovoltaic market-oriented trading. Furthermore, an example of distributed photovoltaic auxiliary services is provided, demonstrating that neglecting auxiliary services may allow distributed photovoltaic transactions to proceed, but they may fail to cover the cost of auxiliary services. Hence, the consideration of auxiliary services for distributed photovoltaics is crucial when organizing market-oriented transactions.

关键词： Photovoltaic systems Costs Electricity Pricing Distribution networks Electricity supply industry power grids Resource management

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Stackelberg game-based optimal scheduling of integrated energy systems considering differences in heat demand across multi-functional areas

arXiv

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arXiv 2022年

作者： Wang, Limeng Yang, Ranran Qu, Yang Xu, Chengzhe Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China State Grid Nanyang Power Supply Company Nanyang473000 China State Grid Jilin Power Supply Company Changchun130000 China

Demand-side management is very critical in China's energy systems because of its high fossil energy consumption and low system energy efficiency. A building shape factor is introduced in describing the architectural characteristics of different functional areas, which are combined with the characteristics of the energy consumed by users to investigate the features of heating load in different functional areas. A Stackelberg game-based optimal scheduling model is proposed for electro-thermal integrated energy systems, which seeks to maximize the revenue of integrated energy operator (IEO) and minimize the cost of users. Here, IEO and users are the Stackelberg game leader and followers, respectively. The leader uses real-time energy prices to guide loads to participate in demand response, while the followers make energy plans based on price feedback. Using the Karush-Kuhn-Tucker (KKT) condition and the big-M method, the model is transformed into a mixed-integer quadratic programming (MIQP) problem, which is solved by using MATLAB and CPLEX software. The results demonstrate that the proposal manages to balance the interests of IEO and users. Furthermore, the heating loads of public and residential areas can be managed separately based on the differences in energy consumption and building shape characteristics, thereby improving the system operational flexibility and promoting renewable energy consumption. © 2022, CC BY-NC-ND.

关键词： MATLAB

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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.

关键词： Transmissions

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A Corrective control Approach For Combined Heat And power system integrated with Multiple energy Storage system

A Corrective Control Approach For Combined Heat And Power Sy...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Lin, Qunli Shen, Xinwei Sun, Yong Li, Zhenyuan Guo, Qinglai Sun, Hongbin Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Insitute Tsinghua University Shenzhen China State Grid Corp. of China Jilin Power Grid Company Jilin China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

ISBN: (纸本)9781728135205

The integrated energy system (IES) becomes very important nowadays, however, the coupling between multiple energy systems will bring new challenges to the security control of the IES, such as combined heat and power (CHP) system. The corrective control means that the operations can be adjusted after contingency happens to eliminate the constraints violation in the contingency state such as the transmission outage or generator outage. This paper proposes a corrective control approach for CHP system integrated with the energy storage system based on security constrained economic dispatch (SCED) model. Case studies based on the IEEE 9-bus CHP system are presented to verify the method. The case result shows that the energy storage device can solve the ramping of the unit's output adjustment well. The corrective control method is more scientific and economical. © 2019 IEEE.

关键词： Outages

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