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Optimal Stochastic Scheduling Strategy of Multi-vector Energy Complex Integrated with Full-blown Power-to-biomethane Model

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 863-873页

作者： Guanwei Zeng Chengxi Liu Minfang Liao Yongjian Luo Xuzhu Dong Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network WuhanChina the School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

We propose an optimal stochastic scheduling strategy for a multi-vector energy complex(MEC),considering a fullblown model of the power-to-biomethane(Pt M)*** conventional optimization that uses a simple efficiency coefficient to coarsely model energy conversion between electricity and biomethane,a detailed Pt M model is introduced to emphasize the reactor kinetics and chemical equilibria of *** model crystallizes the interactions between the Pt M process and MEC flexibility,allowing to adjust the operating condition of the methanation reactor for optimal MEC operation in stochastic *** optimization and flowsheet design of the Pt M process increase the average selectivity of methane(i.e.,ratio between net biomethane production and hydrogen consumption)up to 83.7%in the proposed synthesis *** results can provide information and predictions to operators about the optimal operating conditions of a Pt M unit while improving the MEC flexibility.

关键词： Multi-vector energy complex optimal stochastic scheduling power-to-biomethane unit process synthesis natural gas

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Power Flow Analytical Solutions and Multi-dimensional Voltage Stability Boundaries Based on Multivariate Quotient-difference Method

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1168-1178页

作者： Chengxi Liu Qiupin Lai School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network Wuhan 430072China IEEE

This paper proposes a novel Multivariate Quotient-Difference(MQD)method to obtain the approximate analytical solution for ac power flow ***,in the online environment,the power flow solutions covering different operating conditions can be directly obtained by plugging values into multiple symbolic variables,such that the power injections and consumptions of selected buses or areas can be independently *** method first derives a power flow solution through a Multivariate Power Series(MPS).Next,the MQD method is applied to transform the obtained MPS to a Multivariate Pad´e Approximants(MPA)to expand the Radius of Convergence(ROC),so that the accuracy of the derived analytical solution can be significantly *** addition,the hypersurface of the voltage stability boundary can be identified by an analytical formula obtained from the coefficients of *** direct method for power flow solutions and voltage stability boundaries is fast for many online applications,since such analytical solutions can be derived offline and evaluated online by only plugging values into the symbolic variables according to the actual operating *** proposed method is validated in detail on New England 39-bus and IEEE 118-bus systems with independent load variations in multi-regions.

关键词： Analytical power flow solution multivariate power series multivariate Padéapproximants multivariate quotient-difference multi-dimensional voltage stability boundary

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A Parallel-type Load Damping Factor Controller for Frequency Regulation in Power Systems with High Penetration of Renewable Energy Sources

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1019-1030页

作者： Zhe Zhang Siyang Liao Yuanzhang Sun Jian Xu Deping Ke Bo Wang Rui Chen Yibo Jiang Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network School of Electrical Engineering and AutomationWuhan UniversityWuhan 430072China State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan 430074China State Grid(Suzhou)City&Energy Research Institute Company Limited Suzhou 215000China

Renewable energy sources(RESs)are rapidly devel-oping and their substitution for traditional power generation poses significant challenges to the frequency regulation in power *** load damping factor D characterizes the active power of load that changes with power system frequency,which is an important factor influencing the frequency ***,the value of D is small,resulting in the limitation in frequency regulation of the power *** paper proposes a parallel-type load damping factor controller to enhance load damping factor by utilizing static var generators(SVGs)in ***,it discusses the configuration method for the relevant parameters of the controller,evaluates its frequen-cy regulation capability,investigates the impact of large-scale application of the controller on static and dynamic loads,and conducts a comprehensive evaluation of the impact of the damping factor control process on the voltage stability of the main *** large-scale application of the proposed controller can significantly improve the frequency regulation capability,and almost have no influence on the working status of the *** can also significantly improve the dynamic performance of system *** proposed controller can provide technical support for the frequency regulation of new power systems with high proportion of RESs.

关键词： Load damping factor parallel-type load damping factor controller power system frequency regulation highproportion renewable energy system

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LCC-MCC Hybrid HVdc Power Flow Calculation Based on Holomorphic Embedding Method 20

LCC-MCC Hybrid HVDC Power Flow Calculation Based on Holomorp...

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20th International Conference on ac and dc Power Transmission 2024, acdc 2024

作者： Luo, Yongjian Liu, Chengxi He, Zaiyu Li, Xiaoming School of Electrical Engineering and Automation Wuhan University Wuhan China Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network Wuhan China

ISBN: (纸本)9781837242672

To capitalize on the advantages and mitigate the disadvantages of LCC and MMC HVdc systems, the LCC-MMC hybrid HVdc system has been developed. The steady-state models for LCC and MMC systems are essentially different. The derivation of the power flow model for this hybrid system is of fundamental importance. This paper first establishes the mathematical model of the LCC-MMC hybrid HVdc system. Then, based on the holomorphic embedding (HE) method, the HE formulation for the constructed model is derived. The approach for germ solution and the high-order power series calculation process is established. Furthermore, a sequential solution algorithm tailored to the hybrid system is proposed. Finally, the effectiveness and accuracy of the proposed method are verified using a modified IEEE 14-bus system incorporating a hybrid LCC-MCC HVdc line. © The Institution of engineering & technology 2024.

关键词： Embeddings

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Steady-state Voltage Security-constrained Optimal Frequency Control for Weak HVdc Sending-end ac Power Systems

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 658-669页

作者： Qiangqiang Wang Liangzhong Yao Jian Xu Yuping Zheng Wei Li Wei Wang School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network(Wuhan University) Wuhan 430072China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation(State Grid Electric Power Research Institute)Nanjing 211106China

Due to the fact that a high share of renewable energy sources(RESs)are connected to high-voltage direct current(HVdc)sending-end ac power systems,the voltage and frequency regulation capabilities of HVdc sending-end ac power systems have *** has resulted in potential system operating problems such as overvoltage and overfrequency,which occur simultaneously when block faults exist in the HVdc *** this study,a steady-state voltage security-constrained optimal frequency control method for weak HVdc sending-end ac power systems is *** integrated virtual inertia control of RESs is employed for system frequency *** dynamic reactive power compensation devices are utilized to control the voltage of all nodes meet voltage security ***,an optimization model that simultaneously considers the frequency and steady-state voltage security constraints for weak HVdc sending-end ac power systems is *** optimal control scheme with the minimum total cost of generation tripping and additional dynamic reactive power compensation required is obtained through the optimization *** are conducted on a modified IEEE 9-bus test system and practical Qing-Yu line commutated converter based HVdc(LCC-HVdc)sending-end ac power system to verify the effectiveness of the proposed method.

关键词： Renewable energy source(RES) high-voltage direct current(HVdc) ac power system optimal frequency control steady-state voltage security dynamic reactive power compensation

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A Novel Bi-Level VSC-dc Transmission Expansion Planning Method of VSC-dc for Power System Flexibility and Stability Enhancement

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Energy engineering 2024年第11期121卷 3161-3179页

作者： Weigang Jin Lei Chen Shencong Zheng Yuqi Jiang Yifei Li Hongkun Chen Support Center of Power System Technology Central China Branch of State Grid Corporation of ChinaWuhan430077China Hubei Engineering and Technology Research Center forAC/DC Intelligent Distribution Network School of Electrical Engineering and AutomationWuhan UniversityWuhan430072China

Investigating flexibility and stability boosting transmission expansion planning(TEP)methods can increase the renewable energy(RE)consumption of the power *** this study,we propose a bi-level TEP method for voltage-source-converter-based direct current(VSC-dc),focusing on flexibility and stability ***,we established the TEP framework of VSC-dc,by introducing the evaluation indices to quantify the power system flexibility and ***,we propose a bi-level VSC-dc TEP model:the upper-level model acquires the optimal VSC-dc planning scheme by using the improved moth flame optimization(IMFO)algorithm,and the lower-level model evaluates the flexibility through time-series production ***,we applied the proposedVSC-dc TEPmethod to the modified IEEE-24 and IEEE-39 test systems,and obtained the optimalVSCdc planning *** results verified that the proposed method can achieve excellent RE curtailment with high flexibility and ***,the well-designed IMFO algorithm outperformed the traditional particle swarm optimization(PSO)and moth flame optimization(MFO)algorithms,confirming the effectiveness of the proposed approach.

关键词： VSC-dc transmission expansion planning renewable energy consumption line delivery flexibility short-circuit ratio improved moth flame optimization algorithm

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Optimization of Direct Load Control Demand Response for Industrial Micro-Grid Using Smart Meter 9

Optimization of Direct Load Control Demand Response for Indu...

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9th Asia Conference on Power and Electrical engineering, acPEE 2024

作者： Bahageel, Ahmed Osman. M. Rashed, Ghamgeen Izat Gony, Hashim Ali I. Badjan, Ansumana Shaheen, Husam I. Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network China Wuhan University School of Electrical Engineering and Automation Hubei Province Wuhan430072 China Changsha University Huhan Changsha China

ISBN: (纸本)9798350309638

The industrial sector is one of the largest electricity consumers, and it is essential to optimize energy consumption to reduce costs and enhance energy efficiency. Demand response (DR) is a strategy that aims to manage and reduce peak electricity demand by shifting energy consumption to off-peak hours or reducing energy consumption during Peak demand periods. Smart meters are a promising technology for implementing DR programs in the industrial microgrid, as they enable real-time monitoring and control of energy usage, providing customers with accurate information about their energy consumption patterns. This study presents an integrated approach to enhance the efficiency of direct load control demand response (DLC-DR) in industrial settings by leveraging smartmeter technology. The primary objective is to concurrently lower energy consumption and associated expenses while reinforcing grid stability. The optimization is formulated as Mixed Integer Linear Programming (MILP). The case study Simulated in the plastic industry shows that Direct load control Demand response in an industrial microgrid with Renewable Energy Resources (RES) and a battery energy storage system (BESS) can effectively utilize the reliability and flexibility of the power grid by reducing peak demand as well as the electricity cost. © 2024 IEEE.

关键词： Smart meters

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PJ-ADMM Based Parallel Energy Sharing Mechanism Between Prosumer Aggregator and Charging Station 3

PJ-ADMM Based Parallel Energy Sharing Mechanism Between Pros...

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3rd IEEE International Conference on Electrical engineering, Big Data and Algorithms, EEBDA 2024

作者： Wang, Hongli Yang, Jun Liao, Fengran Jia, Legang Du, Nianjiang Li, Tianhui School of Electrical Engineering and Automation Wuhan University Hubei Engineering and Technology Research Center for Ac Dc Intelligent Distribution Network Wuhan China State Grid Yantai Power Supply Company Yantai China

ISBN: (纸本)9798350380989

Flexible resources such as renewable energy and electric vehicles are expanding. In order to efficiently utilize the energy from various types of prosumers, an energy sharing market mechanism between prosumer aggregator and charging stations is proposed. Based on the PJ-ADMM algorithm, the proposed mechanism is capable of parallel iterative computation to realize market clearing. We validate the effectiveness of the proposed mechanism through a case study. After participating in energy sharing, the social welfare is improved and the resources can be optimally allocated. © 2024 IEEE.

关键词： charging station energy sharing PJ-ADMM prosumer

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Two-Stage Robust Optimization for Microgrid Incorporating Renewable Energy Uncertainties via Bayesian Inference with Gaussian Processes 9

Two-Stage Robust Optimization for Microgrid Incorporating Re...

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9th Asia Conference on Power and Electrical engineering, acPEE 2024

作者： Haider, Hussain Jun, Yang Rashed, Ghamgeen Izat Wuhan University Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network School of Electrical Engineering and Automation Hubei Province Wuhan430072 China Wuhan University School of Electrical Engineering and Automation Hubei Province Wuhan430072 China

ISBN: (纸本)9798350309638

This study contributes a data-driven two-stage robust optimization framework to account for the uncertainties in renewable energy sources within microgrid systems. The framework integrates Bayesian inference with Gaussian Process regression (GPR) analysis to evaluate and model the output uncertainties of photovoltaic (PV) and Wind turbine (WT) power sources. Furthermore, the correlation between these sources is established at various uncertainty levels. The two-stage optimization approach incorporates the day-ahead dispatch stage and real-time adjusting under economic factors in the second stage. So, the framework controls day-ahead dispatch strategies to optimize microgrids in the prospect of varying PV-WT output and electricity demand. Subsequently, it involves real-time optimization under the worst-case scenario, enhancing the microgrid's economic viability and operational efficiency. Finally, a column-and-constraint generation (C&CG) method is employed to address the robust optimization model by incorporating different levels of uncertainty. The proposed method is established on an IEEE 33-bus distribution network, ensuring its applicability and reliability. © 2024 IEEE.

关键词： Gaussian distribution

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Large Grids Multi-Level and Multi-Type Dynamic Reactive Power Compensation Layout 4

Large Grids Multi-Level and Multi-Type Dynamic Reactive Powe...

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4th International Conference on Energy engineering and Power Systems, EEPS 2024

作者： Yu, Xiaodong Ling, Xu Xi, Jianghui Wang, Jiale Jin, Weigang Wang, Ying Wang, Yuan Central China Branch State Grid Corporation of China Wuhan China Wuhan University School of Electrical Engineering and Automation Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network Wuhan China

ISBN: (纸本)9798350366914

Reasonable configuration of reactive power compensation devices can achieve a better effect of suppressing phase-change failure at the same time of relative economy, which is conducive to guaranteeing the safe and stable operation of the multi-dc-fed receiving end power grid. A reactive power compensation optimisation method is proposed to suppress the phase change failure of the LCC-HVdc dc transmission system by studying the phase change failure of the LCC-HVdc dc transmission system and its suppression method. Firstly, the phase-change mechanism of the converter valve is analysed;then, based on the coupling effect of phase-change failure among multiple-feeding dcs, the reactive power compensation siting and capacitance-setting models for suppressing phase-change failure of multiple-feeding dcs at the receiving end are proposed. Finally, the simulation example proves the effectiveness of the proposed optimisation method. © 2024 IEEE.

关键词： HVdc power transmission

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