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Journal of Modern Power Systems and Clean Energy 2020年第4期8卷 727-736页

作者： Junjie Hu Huayanran Zhou yang Li Peng Hou guangya yang IEEE State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China SEWPG European Innovation Center AarhusDenmark Center for Electric Power and Energy Technical University of DenmarkLyngbyDenmark

The increasing number of photovoltaic(PV)generation and electric vehicles(EVs)on the load side has necessitated an aggregator(Agg)in power system *** this paper,an Agg is used to manage the energy profiles of PV generation and ***,the daily management of the Agg is challenged by uncertain PV *** address this problem,a robust multi-time scale energy management strategy for the Agg is *** a day-ahead phase,robust optimization is developed to determine the power *** a real-time phase,a rolling horizon-based convex optimization model is established to track the day-ahead power schedule based on the flexibilities of the EVs.A case study indicates a good scheduling performance under an uncertain PV *** the convexification,the solving efficiency of the real-time operation model is improved,and the over-charging and over-discharging problems of EVs can be suppressed to a certain ***,the power deviation between day-ahead and real-time scheduling is controllable when the EV dispatching capacity is *** strategy can ensure the flexibility of the Agg for real-time operation.

关键词： Aggregated electric vehicle(EV) aggregator(Agg) photovoltaic(PV) robust optimization convex optimization

Convex optimization of virtual storage system scheduling in market environment

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1735-1739页

作者： Peng HOU Junjie HU guangya yang Center of Electrical Engineering Technical University of DenmarkElektrovejBuilding 325LyngbyDenmark State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

Due to the popularization of distributed energy resources(DERs),the aggregated prosumer effect excels a general energy storage system *** energy storage system(VESS)concept is proposed hereby that mimics an actual storage unit and incorporates the same charging(consumer)and discharging(producer)*** is possible to provide ancillary services via VESS by exploiting the flexibility and thus much research has been proposed on the optimization of the VESS *** general,the charging and discharging efficiencies of VESS are different and there can be only one status at a time *** achieve the optimal schedule while considering the constraints above,binary terms should be introduced into the optimization problem which end up with a nonconvex *** this paper,a complimentary mathematical proof is given for the convexification of this mixed-integer linear programming(MILP)problem so that the linear programming(LP)method can be applied instead if the objective function is *** proposed proof is validated through a case study and the simulation results show the effectiveness of the proposed method.

关键词： Virtual energy storage system(VESS) Convexification Mixed linear programming(MILP) Complimentary mathematical proof

Allocation of synchronous condensers for restoration of system short-circuit power

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Journal of Modern Power Systems and Clean Energy 2018年第1期6卷 17-26页

作者： Emanuel MARRAZI guangya yang Peter WEINREICH-JENSEN Center for Electric Power and Energy Department of Electrical Engineering Technical University of Denmark Siemens A/S

Modern power systems,employing an increasing number of converter-based renewable energy sources(RES)and decreasing the usage of conventional power plants,are leading to lower levels of short-circuit power and rotational inertia.A solution to this is the employment of synchronous condensers in the grid,in order to provide sufficient short-circuit *** results in the increase of the short-circuit ratio(SCR)at transmission system busbars serving as points of interconnection(POI)to renewable *** of the required capacity and grid-location of the synchronous condensers,is inherently a mixed integer nonlinear optimization problem,which could not be done on manual basis considering each type of machine and all *** study therefore proposes a method of optimal allocation of synchronous condensers in a hypothetic future scenario of a transmission system fed by renewable *** cost of synchronous condenser installations in the system is minimized and the SCRs at the POIs of central renewable power plants are *** method has potential for application on larger grids,aiding grid-integration of RES.

关键词： Short-circuit power Short-circuit ratio Synchronous condenser

Transient Stability Analysis of Grid-connected Converters in Wind Turbine Systems Based on Linear Lyapunov Function and Reverse-time Trajectory

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 782-790页

作者： Mohammad Kazem Bakhshizadeh Sujay Ghosh guangya yang Łukasz Kocewiak Ørsted Wind Power A/S Nesa Allé12820Denmark Technical University of Denmark Anker Engelunds Vej 12800Denmark

As the proportion of converter-interfaced renewable energy resources in the power system is increasing,the strength of the power grid at the connection point of wind turbine generators(WTGs)is gradually *** research has shown that when connected with the weak grid,the stability of the traditional grid-following controlled converters will deteriorate,and they are prone to unstable phenomena such as *** to the limitations of linear analysis that cannot sufficiently capture the stability phenomena,transient stability must be *** far,standalone time-domain simulations or analytical Lyapunov stability criteria have been used to investigate transient ***,the time-domain simulations have proven to be computationally too heavy,while analytical methods are difficult to formulate for larger systems,require many modelling assumptions,and are often conservative in estimating the stability *** paper proposes and demonstrates an innovative approach to estimating the transient stability boundary via combining the linear Lyapunov function and the reverse-time trajectory *** proposed methodology eliminates the need of time-consuming simulations and the conservative nature of Lyapunov *** study brings out the clear distinction between the stability boundaries with different post-fault active current ramp rate *** the same time,it provides a new perspective on critical clearing time for wind turbine *** stability boundary is verified using time-domain simulation studies.

关键词： Lyapunov direct method non-autonomous system phase-locked loop(PLL) time trajectory reversal transient stability assessment wind turbine converter system

A review of offshore wind farm layout optimization and electrical system design methods

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Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 975-986页

作者： Peng HOU Jiangsheng ZHU Kuichao MA guangya yang Weihao HU Zhe CHEN Center of Electrical Engineering Technical University of DenmarkLyngbyDenmark Department of Energy Technology Aalborg UniversityAalborgDenmark School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengduChina

There is more wind with less turbulence offshore compared with an onshore case,which drives the development of the offshore wind farm *** a huge amount of money is required for constructing an offshore wind farm,many types of research have been done on the optimization of the offshore wind farm with the purpose of either minimizing the cost of energy or maximizing the total energy *** are several factors that have an impact on the performance of the wind farm,mainly the energy production of wind farm which is highly decided bythe wind condition of construction area and micro-siting of wind turbines(WTs),as well as the initial investment which is influenced by both the placement of WTs and the electrical system design,especially the scheme of cable connection *** this paper,a review of the state-of-the-art researches related to the wind farm layout optimization as well as electrical system design including cable connection scheme optimization is *** most significant factors that should be considered in the optimization work of the offshore wind farm is highlighted after reviewing the latest works,and the future needs are specified.

关键词： Energy production Wake modelling Wind farm layout optimization Cable connection scheme optimization Offshore wind farm

Effects of centralized and local PV plant control for voltage regulation in LV feeder based on cyber-physical simulations

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Journal of Modern Power Systems and Clean Energy 2018年第5期6卷 979-991页

作者： Theis Bo RASMUSSEN guangya yang Arne Hejde NIELSEN Zhaoyang DONG Center for Electric Power and Energy Technical University of Denmark School of Electrical Engineering and Telecommunications University of New South Wales

In the modern power system, both local and centralized reactive power control strategies for photovoltaic(PV) plants, are proposed and compared. While local control improves the network security, it lacks the optimization benefits from centralized control ***, this paper considers the coordination of the two control strategies, depending on external impact from the weather system and consumer behavior, in a low voltage(LV) distribution feeder. Through modeling and simulation in an established real-time cyber-physical simulation platform, the LV network is evaluated with both local and centralized control. A set of boundaries for coordinating between the two strategies are identified, which can help network operators decide suitable control in different operating situations. Furthermore, the cyber-physical simulation platform, is used to study the impact of physical perturbations, i.e. changes in irradiance and consumption,and cyber disturbances, in form of communication channel noise, is evaluated for the control strategies. Results show how small and large disturbances in the cyber system affect the centralized control strategy optimizer performance.

关键词： Distribution Network Voltage regulation Photovoltaics Cyber-physical system

A Distributed Transactive Energy Mechanism for Integrating PV and Storage Prosumers in Market Operation

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Engineering 2022年第5期8卷 171-182页

作者： Peng Hou guangya yang Junjie Hu Philip J.Douglass Yusheng Xue Technical University of Denmark Kongens Lyngby 2800Denmark School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing 102206China Danish Energy Frederiksberg 1900Denmark State Grid Electric Power Research Institute Nanjing 211106China

The decreasing cost of solar photovoltaics(PVs)and battery storage systems is driving their adoption in the residential distribution system,where more consumers are becoming *** this trend is the potential roll-out of home energy management systems(HEMSs),which provide a means for prosumers to respond to externalities such as energy price,weather,and energy ***,the economic operation of prosumers can affect grid security,especially when energy prices are extremely low or ***,it is paramount to design a framework that can accommodate the interests of the key stakeholders in distribution systems—namely,the network operator,prosumer,and *** this paper,a novel transactive energy(TE)-based operational framework is *** this frame-work,aggregators interact with the distribution grid operator through a negotiation process to ensure network security,while at the lower level,prosumers submit their schedule to the aggregator through the *** network security is at risk,aggregators will send an additional price component representing the cost of security(CoS)to the prosumer to stimulate further *** simulation results show that the proposed framework can effectively ensure the economic operation of aggregators and prosumers in distribution systems while maintaining grid security.

关键词： Demand management Prosumer Transactive energy Aggregator Grid security

Applying Synchronous Condenser for Damping Provision in Converter-dominated Power System

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 639-647页

作者： Ha Thi Nguyen guangya yang Arne Hejde Nielsen Peter HΦjgaard Jensen Bikash Pal the Department of Electrical Engineering Danmarks Tekniske UniversitetRoskildeDenmark the Electrical Engineering Technical University of DenmarkLyngbyDenmark Siemens AG Sektor Energie BallerupDenmark the Department of Electrical and Electronic Engineering Imperial College LondonLondonUK

The dynamic characteristics of converter-dominated systems are governed by controlling power converters and the interactions between converter systems and conventional *** oscillations can appear under dynamic operation conditions caused by the phase-locked loop dynamics and interactions among the converter control *** oscillations may be poorly damped,which can result in reduced power generation,longer settling time,or disconnections of sensitive *** is foreseeable that damping services will be critical for power grid stabilization in the future with high penetration of renewable *** this work,synchronous condensers(SCs)are evaluated and applied to provide damping services to the power grid under post-event *** innovative supplementary controller for the automatic voltage regulator of SCs is proposed to improve the frequency stabilization in a converter-dominated system after *** local and remote measurements,SCs are able to modulate the reactive power output and hence,the terminal bus voltage,which further impacts the power flow in the system;therefore,damping can be provided to the frequency *** control is implemented on an industrial-level hardware platform,and the performance is verified by the hardware-in-the-loop simulation.

关键词： Power oscillation Prony analysis low-inertia system supplementary controller synchronous condenser(SC)

LSTM-based Energy Management for Electric Vehicle Charging in Commercial-building Prosumers

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 1205-1216页

作者： Huayanran Zhou Yihong Zhou Junjie Hu guangya yang Dongliang Xie Yusheng Xue Lars Nordström State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Center for Electric Power and Energy Technical University of DenmarkLyngbyDenmark State Grid Electric Power Research Institute NanjingChina Division of Electric Power and Energy Systems School of Electrical Engineering and Computer ScienceKTH Royal Institute of TechnologyStockholmSweden

As typical prosumers,commercial buildings equipped with electric vehicle(EV)charging piles and solar photovoltaic panels require an effective energy management ***,the conventional optimization-model-based building energy management system faces significant challenges regarding prediction and calculation in online *** address this issue,a long short-term memory(LSTM)recurrent neural network(RNN)based machine learning algorithm is proposed in this paper to schedule the charging and discharging of numerous EVs in commercial-building *** the proposed system control structure,the LSTM algorithm can be separated into offline and online *** the offline stage,the LSTM is used to map states(inputs)to decisions(outputs)based on the network *** the online stage,once the current state is input,the LSTM can quickly generate a solution without any additional prediction.A preliminary data processing rule and an additional output filtering procedure are designed to improve the decision performance of LSTM *** simulation results demonstrate that the LSTM algorithm can generate near-optimal solutions in milliseconds and significantly reduce the prediction and calculation pressures compared with the conventional optimization algorithm.

关键词： Building energy management system(BEMS) electric vehicle(EV) long short-term memory(LSTM) recurrent neural network machine learning prosumer

Voltage regulation in LV grids by coordinated volt-var control strategies

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Journal of Modern Power Systems and Clean Energy 2014年第4期2卷 319-328页

作者： Miguel JUAMPEREZ guangya yang Søren Bækhøj KJÆR Center for Electric Power and Energy Department of Electrical EngineeringTechnical University of DenmarkElektrovej Building 3252800 Kgs.LyngbyDenmark Danfoss Solar Inverters A/S Ulsnæs 16300 Gra°stenDenmark

The increasing penetration level of photovoltaic(PV)power generation in low voltage(LV)networks results in voltage rise issues,particularly at the end of the *** order to mitigate this problem,several strategies,such as grid reinforcement,transformer tap change,demand-side management,active power curtailment,and reactive power optimization methods,show their contribution to voltage support,yet still *** paper proposes a coordinated volt-var control architecture between the LV distribution transformer and solar inverters to optimize the PV power penetration level in a representative LV network in Bornholm Island using a multi-objective genetic *** approach is to increase the reactive power contribution of the inverters closest to the transformer during overvoltage *** standard reactive power control concepts,cosu(P)and Q(U),are simulated and compared in terms of network power losses and voltage level along the *** a practical implementation,a reconfigurable hardware is used for developing a testing platform based on real-time measurements to regulate the reactive power *** proposed testing platform has been developed within *** project,which targets to study the approaches for large PV power integration into the network,without the need of reinforcement.

关键词： Voltage regulation Reactive power optimization Genetic algorithm