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Two-Stage Low-Carbon Economic Dispatch of an Integrated Energy System Considering Flexible Decoupling of Electricity and Heat on Sides of Source and Load

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SSRN 2024年

作者： Yang, Lijun Gao, Yejin Zhang, Pei Tan, Xiaolin An, Jiakun School of Electrical Engineering Yanshan University Qinhuangdao066004 China Key Laboratory of Power Electronics for Energy Conservation and Drive Control of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Smart Grid Ministry of Education Tianjin University Tianjin300072 China Economic and Technological Research Institute of State Grid Hebei Electric Power Shijiazhuang050000 China

Under the goal of "double carbon", in order to enhance the level of new energy consumption, a low-carbon economic planning strategy with flexible decoupling of electricity and heat is proposed, by introducing a new type of electric-thermal coupling equipment on both sides of the source and load. Firstly, a wind power(WT) – power to ammonia(P2A) - CHP units - thermal power (TH) units joint operation strategy is proposed on the source side. This strategy realizes the conversion of abandoned wind to green ammonia to ammonia coal hybrid generation and the decoupled operation of CHP units. Secondly, A dynamic incentive demand response model is developed to meet the demand of high proportion distributed PV in situ consumption on the load side. The dynamic incentive price guides distributed power-to-heat load to change the response capacity, tracks the abandonment of wind and light, realizes the flexible conversion of power and heat load. On this basis, A two-stage thermoelectric decoupling model is established. In the day-ahead phase, the source-side electric-thermal-ammonia joint operation strategy is considered, and the electric and thermal energy supply plans are adjusted centrally;In the intra-day phase, the flexible adjustment range of power-to-heat devices and the heat load inertia on the load side are taken into account, and the electricity and heat planning strategies are adjusted in a distributed-centralised manner in conjunction with the source side. Finally, the results show that the proposed scheme can promote the absorption of wind and light, and can achieve the goal of low-carbon economic dispatch. © 2024, The Authors. All rights reserved.

关键词： Ammonia

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Evaluation Approach for CPS Assessment Fee Return Method Based on Sequential Game of Two Provinces

Evaluation Approach for CPS Assessment Fee Return Method Bas...

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Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Yuancheng Miao Lifeng Wang Zijie Chen Yutong Li Bingbing Song Xiaobi Teng Dispatch and Control Branch Center East China Branch of State Grid Corporation of China Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China College of Smart Energy Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

Under the current inter-provincial tie-line power assessment mechanism in China, regional power grids typically return assessment fees to each province based on their relative tie-line and frequency control performance. However, under this return method, if all provinces in a regional grid perform poorly in frequency regulation capacity, the returned control performance standard (CPS) fines for each province will be close, resulting in a lower penalty for power and frequency over-limit violations on provincial grid interconnections. To simulate and compare the decision-making of provincial dispatch and control centers regarding automatic generation control (AGC) adjustable capacity under different CPS assessment fee return methods, this article proposes a two-province game model. In this model, the two provinces follow best response dynamics for alternating frequency regulation simulation and scheduling optimization until a balance is reached or the variation in reserve capacity is within a certain range. Testing different combinations of assessment prices and return methods, the results show that determining and announcing the provinces to receive fine returns based on their ranking in assessed electricity quantity can better motivate provinces to improve frequency regulation performance.

关键词： Electricity Power system dynamics Games Automatic generation control Dynamic scheduling Power grids Game theory

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Research on External Characteristics for PMSG Wind Turbine Systems under Symmetrical Fault

Research on External Characteristics for PMSG Wind Turbine S...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Xie, Hua Zhao, Qingchun Liu, Peilin Gao, Xuesong NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China School of Electrical Engineering Shandong University Jinan China

ISBN: (纸本)9781728191645

Wind turbines (WTs) are based on power electronic converters. Due to different control schemes of converters, WTs exhibit diverse external characteristics when grid symmetrical fault occurs. Thus, the output current and output power of WTs cannot be forecasted, which is a challenge for the power system stability. In this regard, this paper proposes a novel strategy for Permanent Magnetic Synchronous Generator (PMSG) wind turbine systems. The strategy aims to force the PMSG exhibit a stable EFC during grid fault and provide an output current reference to the power system. Besides, the proposed strategy aims at enhancing the low-voltage ride-through capability of the PMSG. The effectiveness and robustness of the proposed strategy is verified in DIgSILENT PowerFactory. © 2020 IEEE.

关键词： Synchronous generators

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Transient Fault Current Calculation Method of Photovoltaic grid-Connected System Considering the Dynamic Response of Phase-Locked Loop

Transient Fault Current Calculation Method of Photovoltaic G...

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IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

作者： Rui Mu Jiawei He Bin Li Wenbo Wang Cheng Yao Yongwu Zhang Key Laboratory of Smart Gird of Ministry of Education Tianjin University Tianjin China Electric Power Research Institute State Grid Tianjin Electric Power Company Tianjin China Electric Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China

The transient fault characteristics of photovoltaic (PV) grid-connected system depend on the dynamic response of each control link. Phase-locked loop (PLL) plays an important role in PV grid-connected system. The dynamic output response of PLL affects the PV transient fault characteristics through coordinate transformation. Existing calculation method for PLL dynamic response is based on the premise that the voltage phase change at the point of common coupling (PCC) is small and the steady-state phase after the fault can be measured, and the calculation error of transient current is large. To accurately describe the PV transient fault characteristics, this work proposes a calculation method of PV transient fault current by considering the dynamic response of PLL. First, the dynamic characteristics of the current inner loop are analyzed in detail, and the transient fault current of $\boldsymbol{d}-\boldsymbol{q}$ axis is calculated. Second, the accurate calculation model of the dynamic response of PLL is established, and the dynamic output of PLL is obtained. The transient fault current calculation model considering the dynamic response of PLL is finally established. Compared with existing calculation method for transient fault current, the proposed method accurately describes the dynamic response characteristics of PLL and the PV transient current change characteristics. Finally, simulation analysis based on PSCAD/EMTDC verifies the accuracy of the proposed method.

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Directional Relay of Wind Farm Transmission Line Based on Traveling Wave Polarity Comparison

Directional Relay of Wind Farm Transmission Line Based on Tr...

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IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

作者： Zhongchen Yuan Yongwu Zhang Yaru Sheng Jiakai Huang Jiawei He Bin Li Electric Power Research Institute State Grid Tianjin Electric Power Company Tianjin China Electric Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China Key Laboratory of Smart Gird of Ministry of Education Tianjin University Tianjin China

The amplitude and phase of the equivalent positive sequence impedance of the wind farm considerably fluctuate during a fault, and the extraction of the sequence fault component is affected by the frequency deviation. As a result, the operating performance of traditional directional relay is affected. This paper proposes a directional relay based on the polarity comparison of traveling waves. First, the polarities of the voltage and current traveling waves are analyzed under the forward and reverse faults. Second, an improved wavelet transform algorithm based on the complementary detail coefficients of adjacent windows is proposed to detect the fault traveling wave. This algorithm eliminates the signal loss problem of wavelet transform. Finally, the Pearson correlation coefficient is introduced to measure the correlation between voltage and current traveling waves, and the action criterion of the directional relay is constructed to realize fault direction discrimination. PSCAD/ETMDC simulation results show that the proposed directional relay can identify the fault direction correctly.

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Current Compensation-Based Transient Stability Enhancement for an Islanded Microgrid

Current Compensation-Based Transient Stability Enhancement f...

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Power System and Green Energy Conference (PSGEC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Xu Zhong Hang Yin Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Dept. of Electrical Engineering Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

With the increasing incorporation of renewable energy via power electronic converters, islanded microgrids are susceptible to transient instability when faced with large disturbances, attributed to converters’ low inertia and high nonlinearity. This paper introduces a current compensation-based control strategy to enhance transient stability of an islanded MG. By incorporating frequency deviation between grid-following converter and grid-forming converter into current controller of grid-following converter, the balance between the system’s equivalent input and output torques can be accelerated. Compared with previous stability-enhanced method, the proposed strategy demonstrates superior performance in the aspect of small overshoot and fast convergence. Simulation results validate the analysis and effectiveness of this strategy.

关键词： Simulation grid following Microgrids Power system stability Stability analysis Power electronics Transient analysis Frequency control Power generation grid forming

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Transient Stability Analysis and Enhancement of an Islanded Microgrid with grid-forming Converters and grid-following Converters

Transient Stability Analysis and Enhancement of an Islanded ...

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Power System and Green Energy Conference (PSGEC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Xu Zhong Hang Yin Key Laboratory of Control of Power Transmission and Conversion Ministry of Education College of Smart Energy Shanghai Jiao Tong University Shanghai China Dept. of Electrical Engineering Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

The rising integration of renewable energy through power electronic converters has heightened the susceptibility of islanded microgrids to transient instability under large disturbances, primarily due to the converters’ low inertia and high nonlinearity. For an islanded microgrid with multiple converters, this paper estimates its transient stability based on Takagi-Sugeno method and introduces a phase compensation-based control strategy to enhance its transient stability. By incorporating angle difference between grid-following converter and grid-forming converter into current controller of grid-following converter, the balance between the system’s equivalent input and output torques can be accelerated. Simulation results validate the analysis and effectiveness of this strategy.

关键词： grid following Simulation Microgrids Power system stability Stability analysis Power electronics Takagi-Sugeno model Transient analysis Power generation grid forming

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Transition Metal (AU, Ag, Pt, Pd, Ni) Doped MoS2 as Gas Sensing Materials for C4F7n Leakage Detection: A Comparative Study

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SSRN 2023年

作者： Yan, Yongxu Li, Yi Zhang, YiFan Wu, Peng Tang, Ju Zhang, Xiaoxing Xiao, Song State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan China Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan430068 China

Fluorinated nitrile (C4F7N) has been considered a novel eco-friendly gas insulating medium, while the low toxicity and leakage risk urgently urge the development of C4F7N gas sensor. Herein, we analyzed the sensing performance of transition metal doped MoS2 to C4F7N based on the density functional theory (DFT). The adsorption energy, charge transfer, deformation charge density and density of states were explored. Furthermore, the sensitivity and recovery performance were analyzed based on frontier orbital and transition state theories. It was found that Pd-MoS2 can achieve a superior balance between sensitivity and response time, showing promising potential for C4F7N leak detection for engineering applications. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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Small-Signal Modeling of Modular Multilevel DC Transformer 5th

Small-Signal Modeling of Modular Multilevel DC Transformer

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International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2020

作者： Hou, Kai Wu, Xingyu Min, Fuhong Wang, Zhigang Wang, Guoning State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu211106 China Nanjing Jiangsu211106 China NARI Technology Co. Ltd. Nanjing Jiangsu211106 China School of Electrical and Automation Engineering Nanjing Normal University Nanjing210023 China

ISBN: (纸本)9789811597459

The dc transformer is considered to be one of the most promising components in future energy systems. The modular multilevel dc transformer inherits many of the characteristics of modular multilevel converter and dual active bridge, which brings many advantages and leads to different working principles from traditional dc transformers. In this paper, the mathematical model is obtained by harmonic decomposition and the small-signal model is obtained by linearization. The parameters of the PI controller are designed according to the small-signal model. The open-loop time-domain simulation verifies the accuracy of the mathematical model. The closed-loop simulation model verifies the reliability of the PI controller. After adding the PI controller, the results of the output voltage show that the model has fast dynamic response with no static errors, which proves that the model obtained by the harmonic decomposition is reliable. © 2021, Springer Nature Singapore Pte Ltd.

关键词： DC transformers

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The operation analysis of the CCHP driven by Gas-steam combined cycle 2

The operation analysis of the CCHP driven by Gas-steam combi...

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2nd International Conference on Oil and Gas Engineering and Geological Sciences, OGEGS 2020

作者： Liang, Junyu Yuan, Xingyu Gu, Jiangqi Yunnan Electric Power Research Institute Csg China Nari Group Co. Ltd State Key Laboratory of Smart Grid Protection and Operation Control

In combined cooling heating and power system, the gas-steam combined cycle is gradually used more and more. The common operation mode in CCHP is mainly to determine heat by electricity and heat by electricity. This paper defines an index indicator and analyzes the difference between the two operating modes in different intervals through the system energy supply interval chart, finally analyzes the difference in the indicators between the two operating modes through the actual load method. It is concluded that in winter operating conditions, the following the thermal load (FTL) operation mode is better;in summer operating conditions, the indicator of following the electric load (FEL) is better;during the transition season, the value of PEC is better in the case of following the thermal load. © Published under licence by IOP Publishing Ltd.

关键词： Thermal load

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