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A Method for Deploying the Minimal Number of UAV Base Stations in Cellular Networks

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IEEE/CAA Journal of Automatica Sinica 2020年第2期7卷 559-567页

作者： Hailong Huang Chao Huang dazhong ma College of Information Science and Engineering Northeastern University

In this paper,we consider the scenario of using unmanned aerial vehicles base stations(UAV-BSs)to serve cellular users.In particular,we focus on frnding the minimum number of UAV-BSs as well as their deployment.We propose an optimization model which minimizes the number of UAV-BSs and optimize their positions such that the user equipment(UE)covered ratio is no less than the expectation of network suppliers,the UEs receive acceptable downlink rates,and the UAV-BSs can work in a sustainable manner.We show the NP-hardness of this problem and then propose a method to address it.The method first estimates the range of the number of UAV-BSs and then converts the original problem to one which maximizes the UE served ratio,given the number of UAV-BSs within that range.We present a maximizing algorithm to solve it with the proof of convergence.Extensive simulations based on a realistic dataset have been conducted to demonstrate the effectiveness of the proposed method.

关键词： Blanket coverage cellular networks coverage control proactive deployment unmanned aerial vehicles(UAV)

The Initial Guess Estimation Newton Method for Power Flow in Distribution Systems

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IEEE/CAA Journal of Automatica Sinica 2017年第2期4卷 231-242页

作者： Qiuye Sun Ling Liu dazhong ma Huaguang Zhang School of Information Science and Engineering Northeastern University School of College of Science Northeastern University IEEE Key Laboratory of Integrated Automation of Process Industry (Northeastern University) of the National Education Ministry

With the increasing integration of distributed generations(DGs), there is a demand for DGs to play a more important role on the voltage regulation. Meanwhile, the high penetration of DGs could raise a technical problem that the distribution system may operate with bi-directional power flow, leading to the inadequacy of the traditional power flow. Considering this new scenario in distribution system power flow, the convergence theorem is proposed, which contributes to develop a novel selection method of the initial guess closed to the convergent solution.Moreover, to ensure the fast rate of power flow convergence, the theorem of the maximum iterations estimation is also proposed.Based on the two proposed theorems, an Initial Guess Estimation Newton method is proposed, considering different operational status of DGs and initial guess sensitivity simultaneously. Based on the standard node systems, Tongliao grid, and 69 system of USA, three simulation examples are provided to illustrate the effectiveness of the proposed method.

关键词： Convergent theorem high penetration distributed generations(DGs) initial Guess estimation Newton method maximum iteration times

Exponential-function-based droop control for islanded microgrids

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 899-912页

作者： Rui WANG Qiuye SUN Yonghao GUI dazhong ma College of Information Science and Engineering Northeastern UniversityShenyangChina Department of Electronic Systems Aalborg UniversityAalborgDenmark

An exponential-function-based droop control strategy for the distributed energy resources(DERs)is proposed to reduce the reactive power-sharing deviation,limit the minimum value of frequency/voltage,whilst improving the utilization rate of renewable energy.Both DERs and loads are interconnected to achieve a power exchange by converters,where the power management system should accurately share the active/reactive power demand.However,the proportional reactive power sharing often deteriorates due to its dependence on the line impedances.Thus,an exponential-function-based droop control is proposed to(1)prevent voltage and frequency from falling to the lower restraint,(2)achieve accurate reactive power sharing,(3)eliminate communication and improve the usage ratio of renewable energy.Furthermore,its stability is analyzed,and the application in islanded AC/DC hybrid microgrids is investigated to achieve the bidirectional power flow.The simulation and experimental results show that the reactive power sharing deviation can be reduced,and the utilization rate of renewable energy is improved by using the proposed method.Moreover,the simulation results illustrate that the system can maintain stable operation when the microgrid is switched from one supplied energy operation condition to another absorbed one.

关键词： Distributed energy resources(DERs) Reactive power-sharing Droop control Bidirectional power flow

A Smart Charging Algorithm Based on a Fast Charging Station Without Energy Storage System

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 850-861页

作者： Qifu Cheng Lei Chen Qiuye Sun Rui Wang dazhong ma Dehao Qin College of Information Science and Engineering Northeastern UniversityShenyang 110819China Ningxia Electric Power Research Institute of State Grid Yinchuan 750001China

With the growing popularity of electric vehicles(EV),there is an urgent demand to solve the stress placed on grids caused by the irregular and frequent access of EVs.The traditional direct current(DC)fast charging station(FCS)based on a photovoltaic(PV)system can effectively alleviate the stress of the grid and carbon emission,but the high cost of the energy storage system(ESS)and the under utilization of the grid-connected interlinking converters(GIC)are not very well addressed.In this paper,the DC FCS architecture based on a PV system and ESS-free is first proposed and employed to reduce the cost.Moreover,the proposed smart charging algorithm(SCA)can fully coordinate the source/load properties of the grid and EVs to achieve the maximum power output of the PV system and high utilization rate of GICs in the absence of ESS support for FCS.SCA contains a self-regulated algorithm(SRA)for EVs and a grid-regulated algorithm(GRA)for GICs.While the DC bus voltage change caused by power fluctuations does not exceed the set threshold,SRA readjusts the charging power of each EV through the status of the charging(SOC)feedback of the EV,which can ensure the power rebalancing of the FCS.The GRA would participate in the adjustment process once the DC bus voltage is beyond the set threshold range.Under the condition of ensuring the charging power of all EVs,a GRA based on adaptive droop control can improve the utilization rate of GICs.At last,the simulation and experimental results are provided to verify the effectiveness of the proposed SCA.

关键词： Energy storage system-free fast charging station hybrid power supply system multiple operation mode smart charging algorithm

Adaptive Bidirectional Droop Control for Electric Vehicles Parking with Vehicle-to-grid Service in Microgrid

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CSEE Journal of Power and Energy Systems 2020年第4期6卷 793-805页

作者： Dehao Qin Qiuye Sun Rui Wang dazhong ma Menglin Liu Clemon University South Carolina29407USA Northeastern University Liaoning 110819China

With the popularity of electric vehicles(EVs),a large number of EVs will become a burden to the future grid with arbitrary charging management.It is of vital significance to the control of the EVs charging and discharging state appropriately to enable the EVs to become friendly to the grid.Therefore,considering the potential for EVs seen as energy storage devices,this paper proposes a multiport DC-DC solid state transformer topology for bidirectional photovoltaic/battery-assisted EV parking lot with vehicle-to-grid service(V2G-PVBP).Relying on the energy storage function of EVs,V2G-PVBP is able to not only satisfy the normal requirements of EVs’owner,but also provide the function of load shifting and load regulation to the microgrid.In this paper,EVs are categorized into limited EV and freedom EV.Limited EVs are always kept in charging state and freedom EVs can take part in the load regulation of the microgrid.The proposed adaptive bidirectional droop control is designed for freedom EVs to make them autonomously charge or discharge with certain power which according to each EV’s state of charge,battery capacity,leaving time,and other factors to maintain the stability of the future microgrid.Eventually,the simulation and experiment of the adaptive bidirectional droop control based V2G-PVBP are provided to prove the availability of V2G-PVBP.

关键词： Adaptive bidirectional droop control DC-DC multiport microgrid parking lot solid-state transformer V2G

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从管段走向管网:管道泄漏诊断技术研究进展

控制工程 2024年第6期31卷 961-972页

作者：张化光王天彪胡旭光马大中刘金海东北大学信息科学与工程学院辽宁沈阳110819 东北大学流程工业综合自动化全国重点实验室辽宁沈阳110819

管道泄漏诊断技术在保障管道系统安全运行中起着至关重要的作用。首先,介绍了管道泄漏诊断系统的结构,并指出由单一管段向复杂管网泄漏诊断的发展趋势。进一步从基于数据驱动的传统泄漏检测方法、管道泄漏信号源定位技术和基于深度学习... 详细信息

管道泄漏诊断技术在保障管道系统安全运行中起着至关重要的作用。首先,介绍了管道泄漏诊断系统的结构,并指出由单一管段向复杂管网泄漏诊断的发展趋势。进一步从基于数据驱动的传统泄漏检测方法、管道泄漏信号源定位技术和基于深度学习的复杂管网泄漏检测方法3个方面进行综述,分析了不同方法的优势、局限性和适用范围。最后指出,随着管网系统的复杂度增加,传统方法的局限性逐渐显现,基于深度学习技术的复杂管网微弱泄漏诊断、多源信号融合和管网智能化的研究将成为未来的研究趋势。

关键词：管道泄漏诊断深度学习复杂管网自适应动态规划

Abnormal Detection Method of Refined Products Pipeline Working State Based on Multi-stage Decision

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Abnormal Detection Method of Refined Products Pipeline Worki...

Research on the Soft-Switching of Solid-State Transformer End-Side

第36届中国控制会议

作者： Xuguang Hu Zhiqiang Yao dazhong ma Qiuye Sun Huaguang Zhang College of Information Science and Engineering Northeastern University China Academy of Safety Science and Technology

ISBN: (纸本)9781538629185

An abnormal detection method is proposed for promotion of efficiency of state assessment because pipeline working state is judged by equipments status and oil parameters.Based on pipeline intellectualization,the pipeline data model is built rely on pipeline data.Then,the spectral analysis of random matrix is used to analyze data matrix containing multivariable time series.The distance indicator between eigenvalues of data matrix and zero is constructed in order to detect the abnormal state of pipeline.When the abnormal state happened,the pressure data model is used to decide if the pipeline working state is leakage.According to the proposed data matrix processing method,the abnormal state of pipeline could be found effectively.The simulations show the effective and good performance of the proposed method.

关键词： Refined Products Pipeline Abnormal Detection Spectral Analysis

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Research on the Soft-Switching of Solid-State Transformer En...

第32届中国控制与决策会议

作者： Yangyang Ge Panfeng Wang Jiazheng Sun dazhong ma Shenghui Li State Grid Liaoning Electric Power Research Institute State Grid School of Information Science and Engineering Northeastern University

Aiming at overcoming the problem that the switching loss of the solid-state transformer（SST） increases greatly at high frequency,the auxiliary resonant commutated pole inverter（ARCPI） is used to achieve soft-switching and improve the efficiency of the SST end-side.However,compared to the hard-switching inverter,the ARCPI contains two additional auxiliary commutation circuits（ACCs）,which will increase the cost and volume of SST.To reduce unnecessary ACC,a novel ARCPI topology and its simplified modulation strategy is proposed in this paper.Two bidirectional switches are used to ensure that the ACC can provide soft-switching conditions for high frequency bridge leg at any time.Based on the single polarity PWM modulation strategy,an ACC of one phase bridge leg is omitted,thus the efficiency of the ARCPI is improved and the cost is reduced.Finally,the simulation model is built and the results validate the effectiveness of the analysis in this paper.

关键词： Soft-switching Solid-state transformer（SST） Auxiliary resonant commutated pole inverter（ARCPI） Zero voltage switching（ZVS） Zero current switching（ZCS）

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基于复合式PSO的光伏最大功率点跟踪控制

红外与激光工程 2015年第12期44卷 3801-3806页

作者：马大中翟小军孙秋野东北大学信息科学与工程学院辽宁沈阳110004

针对不均匀光照条件下光伏阵列的MPPT跟踪控制问题,提出了基于粒子群的复合式MPPT控制算法。复合式PSO-MPPT控制算法包括离线寻优和在线寻优两个部分。离线寻优环节采用相邻粒子信息交换机制加强了在寻优过程中的收敛性以及对关键区域... 详细信息

针对不均匀光照条件下光伏阵列的MPPT跟踪控制问题,提出了基于粒子群的复合式MPPT控制算法。复合式PSO-MPPT控制算法包括离线寻优和在线寻优两个部分。离线寻优环节采用相邻粒子信息交换机制加强了在寻优过程中的收敛性以及对关键区域的搜索力度;在线寻优环节采用适应度模糊判断的方法解决了粒子群算法在线工作时扰动大、耗时长的问题。复合式PSOMPPT控制算法将离线和在线的优化方法结合到一起,弥补了各自方法的不足。与传统的方法相比,所提出的方法具有更快的响应速度和更高寻优精度。最后通过matlab仿真证明了所提出的算法可以实现在不均匀光照条件下的最大功率点跟踪。

关键词：最大功率点跟踪粒子群优化复合控制不均匀光照