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Science china(Technological Sciences) 2010年第12期53卷 3232-3240页

作者： mu yunfei & jia hongjie key laboratory of power system simulation and control of ministry of education, tianjin university, tianjin 300072, china key laboratory of power system simulation and control of ministry of education Tianjin University

A new approach to determining the local boundaries of voltage stability region in power injection space (IVSR) for power system with wind farms is presented. It can be used for power system voltage stability analysis and on-line security assessment with considering the output uncertainty of the wind farms. Firstly, power flow tracing and double dispatching are used to determine the generators that are closely related to the wind farms, in order to balance the power fluctuations caused by the wind speed variation. Then, modal analysis is used to get the key generators to achieve an effective dimension reduction for IVSR. Finally, the forecasting output power (or wind speed) of wind farms is divided into several intervals. For each interval, the corresponding local IVSR boundaries can be calculated by the method based on small disturbance. Moreover, parallel process is used to accelerate the computing speed. The presented approach is validated by several power systems. It can be revealed that the approach can give the local IVSR boundaries at different wind speeds and has a good engineering application prospect.

关键词： voltage stability region power flow tracing modal analysis parallel process

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基于MAS的配电网三相状态估计

天津大学学报 2010年第2期43卷 95-101页

作者：徐臣余贻鑫贾宏杰天津大学电力系统仿真控制教育部重点实验室天津300072

为了探索建立配电快速仿真与模拟(DFSM)并行分布式计算环境的有效方法,将Agent和多Agent系统(MAS)的理论和方法应用于DFSM的研究;并以基于支路电流的配电网三相状态估计(DSE)为具体的研究对象,提出了Agent的八元素实现结构描述框架;详... 详细信息

为了探索建立配电快速仿真与模拟(DFSM)并行分布式计算环境的有效方法,将Agent和多Agent系统(MAS)的理论和方法应用于DFSM的研究;并以基于支路电流的配电网三相状态估计(DSE)为具体的研究对象,提出了Agent的八元素实现结构描述框架;详细阐述了配电网的分割方法和有偏序关系的配电子网状态估计迭代计算算法;设计并实现了基于MAS的DSE并行分布式计算环境(masDSE).算例分析表明:在实验系统中,masDSE可以使计算效率至少提高50%.

关键词：智能配电网三相状态估计配电快速仿真与模拟多Agent系统

中压直流配电场景下混合型MMC过调制工况对运行稳定性的影响分析

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天津大学学报（自然科学与工程技术版） 2024年第2期57卷 123-136页

作者：肖迁徐劲贾宏杰穆云飞金昱陆文标智能电网教育部重点实验室(天津大学) 天津300072

混合型模块化多电平换流器(hybrid MMC)可通过过调制运行实现中压直流(MVDC)配电网的直流故障穿越.现有研究未充分分析过调制工况下混合型MMC的运行稳定性,无法满足中压直流配电网的运行需求.为此,本文通过与正常工况进行对比,分析了过... 详细信息

混合型模块化多电平换流器(hybrid MMC)可通过过调制运行实现中压直流(MVDC)配电网的直流故障穿越.现有研究未充分分析过调制工况下混合型MMC的运行稳定性,无法满足中压直流配电网的运行需求.为此,本文通过与正常工况进行对比,分析了过调制工况对混合型MMC运行稳定性的影响.首先,在电气与控制部分统一的dq坐标系下,构建考虑直流调制比的混合型MMC小信号模型,并将其与详细电磁暂态(EMT)仿真结果对比,验证所建立模型的准确性;其次,对比正常及过调制工况下的根轨迹,进而从控制参数可行域的角度分析了过调制工况对系统运行稳定性的影响;然后,基于主导模态特征根的虚部计算系统失稳时的振荡频率,并将其与相同控制参数下电磁暂态仿真结果进行对比,验证上述稳定性分析结果的正确性;最后,基于参与因子法计算各状态变量对于主导模态的参与程度,从而揭示对系统稳定性影响较大的关键状态变量.理论分析及仿真结果表明,混合型MMC的内部模态会随着交流及直流电流控制器参数的增大而逐渐趋于不稳定;相较于正常工况,过调制工况下混合型MMC控制参数可行域扩大,小信号稳定性提高.

关键词：中压直流配电网混合型模块化多电平换流器小信号建模稳定性分析根轨迹

改进下垂控制下的中压直流配电系统双时间尺度分层调控方法

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中国电机工程学报 2024年第7期44卷 2507-2518,I0001页

作者：肖迁陆文标贾宏杰穆云飞余晓丹智能电网教育部重点实验室(天津大学) 天津市南开区300072

针对中压直流配电系统,在负荷激增、可再生能源出力突变等特殊工况下,传统优化调度方案与协调控制策略存在系统运行经济性有待提升、直流母线电压易越限的问题。为此,提出一种基于改进下垂控制的中压直流配电系统双时间尺度分层调控方... 详细信息

针对中压直流配电系统,在负荷激增、可再生能源出力突变等特殊工况下,传统优化调度方案与协调控制策略存在系统运行经济性有待提升、直流母线电压易越限的问题。为此,提出一种基于改进下垂控制的中压直流配电系统双时间尺度分层调控方法。首先,构建一种具备直流故障穿越能力的3端混合型模块化多电平换流器(modular multilevel converter,MMC)环状±10 kV中压直流配电系统,该系统含电动汽车充电站、储能系统、分布式光伏与风电等灵活性资源。其次,制定各单元协调控制策略,并采用tan函数改进传统下垂控制,以提高系统应对大幅功率波动的能力。然后,基于改进控制策略提出一种双时间尺度分层优化调控方法:在长时间尺度的系统调度层,以运行总成本最小为优化目标,确定各换流器参考功率;在短时间尺度的换流器间协调控制层,改进下垂曲线,并优化控制系数,以兼顾系统运行经济性与电能质量。最后,以典型算例验证该文所提优化调度方案及协调控制策略的有效性:通过灵活调度多种柔性资源,系统运行总成本可降低约11%;在某数据中心负荷激增100%的工况下,各直流母线电压波动仍能维持在±3%UN(额定电压)的允许范围内。

关键词：中压直流配电系统分层协调控制双时间尺度优化改进下垂控制系数优化

MMC-HVDC交直流混联系统小扰动稳定域迭代求解和形态分析

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电力系统自动化 2024年第16期48卷 40-50页

作者：曹靖洺董朝宇王睿穆云飞肖迁贾宏杰智能电网教育部重点实验室(天津大学) 天津市300072 东北大学信息科学与工程学院辽宁省沈阳市110819

随着高压直流输电技术的发展,区域电力系统将拓展为大规模交直流混联系统。因此,需要建立可以同时精确刻画交直流动态的大规模交直流混联系统模型来研究混联系统的动态与稳定性。文中考虑了交流侧和直流侧的详细动态,建立了异步联网的... 详细信息

随着高压直流输电技术的发展,区域电力系统将拓展为大规模交直流混联系统。因此,需要建立可以同时精确刻画交直流动态的大规模交直流混联系统模型来研究混联系统的动态与稳定性。文中考虑了交流侧和直流侧的详细动态,建立了异步联网的模块化多电平换流器型高压直流(MMC-HVDC)交直流混联系统的状态空间模型,给出了具体的解析解形式,并推导了多重迭代信赖域算法。所提算法建立了决策变量空间内的点与平衡点的映射关系,结合Hopf分岔识别边界,提出了一种多重迭代求解小扰动稳定域边界的方法。在利用Simulink仿真验证模型准确性后,以发电机出力作为决策变量绘制了交直流混联系统稳定域,利用特征根和参与因子定量研究了直流失稳和交流失稳的机理以及控制策略和控制参数对稳定域边界的影响。对比分析了多区域的混联系统与交流系统的稳定域,结果表明换流站和直流网络的引入可能使多区域系统稳定域边界呈现多约束共同决定的近似分段线性拓扑特性。

关键词：交直流混联系统模块化多电平换流器信赖域算法稳定域参与因子 Hopf分岔

Successive MISOCP Algorithm for Islanded Distribution Networks with Soft Open Points

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CSEE Journal of power and Energy systems 2023年第1期9卷 209-220页

作者： Tao Zhang yunfei mu hongjie jia Xinying Wang Tianjiao Pu key laboratory of Smart Grid of ministry of education Key Laboratory of Smart Energy&Information Technology of Tianjin MunicipalityTianjin UniversityTianjin 300072China e china Electric power Research Institute Beijing 100192China

An optimal operation scheme is of great significance in islanded distribution networks to restore critical loads and has recently attracted considerable *** this paper,an optimal power flow(OPF)model for islanded distribution networks equipped with soft open points(SOPs)is *** in the grid-connected mode,the adequacy of local power generation in distribution networks is critical for islanded *** proposed approach utilizes the power output of local distributed generations(DGs)and the benefits of reactive power compensation provided by SOPs to allow maximum *** exploit the available resources,an optimal secondary droop control strategy is introduced for the islanded distribution networks,thereby minimizing load *** formulated OPF problem is essentially a mixed-integer nonlinear programming(MINLP)*** guarantee the computation efficiency and accuracy.A successive mixed-integer second-order cone programming(SMISOCP)algorithm is proposed for handling the nonlinear islanded power flow *** case studies,incorporating a modified IEEE 33-bus system and IEEE 123-bus system,are performed to test the effectiveness of the proposed approach.

关键词： Distribution network islanded operation second-order cone programming soft open points successive approximation

面向中压直流配电网的模块化多电平电池储能系统电荷吞吐量抑制策略

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中国电机工程学报 2024年第16期44卷 6482-6493,I0016页

作者：肖迁于浩霖金昱穆云飞陆文标李文华贾宏杰智能电网教育部重点实验室(天津大学) 天津市南开区300072 省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学) 天津市北辰区300401

模块化多电平电池储能系统(modular multilevel converter-battery energy storage system,MMC-BESS)中各子模块功率周期性波动,与其相连的电池组充放电状态频繁切换,产生额外的电荷吞吐量,危害电池储能系统寿命。当MMC-BESS用于中压直... 详细信息

模块化多电平电池储能系统(modular multilevel converter-battery energy storage system,MMC-BESS)中各子模块功率周期性波动,与其相连的电池组充放电状态频繁切换,产生额外的电荷吞吐量,危害电池储能系统寿命。当MMC-BESS用于中压直流配电网时,其交直流侧功率传输情况复杂多变,增大电荷吞吐量的抑制难度。因此,文中针对中压直流配电网中的MMC-BESS,提出一种基于二倍频环流注入的电荷吞吐量抑制策略。首先,构建中压直流配电网中MMC-BESS的数学模型;其次,剖析MMC-BESS电荷吞吐量的产生机理,分析不同运行方式下电荷吞吐量的影响因素;再次,提出基于二倍频环流注入的电荷吞吐量抑制策略,以系统总电荷吞吐量最小为目标,选取不同工况下需注入的最优二倍频环流分量;最后,多种工况下的仿真及实验结果表明,所提方法可有效抑制中压直流配电网中MMC-BESS的电荷吞吐量。

关键词：中压直流配电网电池储能系统模块化多电平变换器电荷吞吐量环流注入

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Dynamic frequency response from electric vehicles in the Great Britain power system

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Journal of Modern power systems and Clean Energy 2015年第2期3卷 203-211页

作者： jian MENG yunfei mu jianzhong WU hongjie jia Qian DAI Xiaodan YU key laboratory of Smart Grid of ministry of education Tianjin UniversityTianjin 300072China School of Engineering Institute of EnergyCardiff UniversityCardiffUK china Electric power Research Institute Haidian DistrictBeijing 100192China

With the large penetration of renewable energy,fulfilling the balance between electricity demand and supply is a challenge to the modern power *** to the UK government,the wind power penetration will reach 30%by the year *** role of electric vehicles(EVs)contributing to frequency response was investigated.A dynamic frequency control strategy which considers the comfort level of vehicle owners was developed for EVs to regulate their power consumption according to the deviation of system frequency.A simulation model of a population of EVs equipped with such controlwas implemented inMatlab/Simulink *** this paper,a simplified Great Britain power system model is used to study the contribution of EVs to dynamic frequency *** case study showed that using EVs as a demand response resource can greatly reduce the frequency *** the rapid response from EVs can help reduce the operation cost of conventional generators.

关键词： Electric vehicles(EVs) Dynamic frequency response Vehicle to grid(V2G) State of charge(SOC)

A preventive control strategy for static voltage stability based on an efficient power plant model of electric vehicles

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Journal of Modern power systems and Clean Energy 2015年第1期3卷 103-113页

作者： Mingshen WANG yunfei mu hongjie jia jianzhong WU Xiuping YAO Xiaodan YU Janaka EKANAYAKE key laboratory of Smart Grid of ministry of education Tianjin UniversityTianjin 300072China School of Engineering Institute of EnergyCardiff UniversityWales CF103BNUK State Grid Xinjiang Electric power Company Urumqi 830002China

With the increasing integration of wind farms and electric vehicles(EVs)in power systems,voltage stability is becoming more and more *** on vehicle-to-grid(V2G),an efficient power plant model of EVs(E-EPP)was developed to estimate EV charging load with available corresponding response capacity under different charging strategies.A preventive control strategy based on E-EPP was proposed to maintain the static voltage stability margin(VSM)of power system above a predefined security *** control modes were used including the disconnection of EV charging load(‘V1G’mode)and the discharge of stored battery energy back to power grid(‘V2G’mode).A modified IEEE 14-bus system with high penetration of wind power and EVs was used to verify the effectiveness of preventive control *** results showed that the proposed strategy can not only improve the static voltage stability of power system with considerable wind generation,but also guarantee the travelling comfort for EV owners.

关键词： Electric vehicle(EV) Vehicle-to-grid(V2G) Efficient power plant(EPP) Preventive control Static voltage stability

Load curve smoothing strategy based on unified state model of different demand side resources

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Journal of Modern power systems and Clean Energy 2018年第3期6卷 540-554页

作者： Mingshen WANG yunfei mu Tao jiaNG hongjie jia Xue LI Kai HOU Tong WANG key laboratory of Smart Grid of ministry of education Tianjin University Department of Electrical Engineering Northeast Electric Power University NARI Solar Energy Technologies Company Limited

Renewable energy based distributed generation(DG) has the potential to reach high penetration levels in the residential region. However, its integration at the demand side will cause rapid power fluctuations of the tieline in the residential region. The traditional generators are generally difficult to manage rapid power fluctuations due to their insufficient efficiency requirements and low responding speed. With an effective control strategy, the demand side resources(DSRs) including DGs, electric vehicles and thermostatically-controlled loads at thedemand side, are able to serve as the energy storage system to smooth the load fluctuations. However, it is a challenge to properly model different types of DSRs. To solve this problem, a unified state model is first developed to describe the characteristics of different DSRs. Then a load curve smoothing strategy is proposed to offset the load fluctuations of the tie-line of the residential region, where a control matrix deduced from the unified state model is introduced to manage the power outputs of different DSRs,considering the response order and the comfort ***, a residential region with households is used to validate the load curve smoothing strategy based on the unified state model, and the results show that the power fluctuation rate of the tie-line is significantly ***, comparative study results are shown to demonstrate the advantages of the unified state model based load curve smoothing strategy.

关键词： Demand side resource(DSR) power fluctuation Distributed generation(DG) Electric vehicle(EV) Thermostatically-controlled load(TCL) Load curve smoothing