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Non-permanent Pole-to-pole Fault Restoration Strategy for Flexible DC Distribution Network

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1339-1351页

作者： Zainan Li jiandong duan Wenchao Lu Xiaotong Du Wei Yang Siyu Tu School of Electrical Engineering Xi’an University of Technology State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University) State Grid Hubei Maintenance Company

As the structures of multiple branch lines(MBLs)will be widely applied in the future flexible DC distribution network,there is a urgent need for improving system reliability by tackling the frequent non-permanent pole-to-pole(P-P)fault on distribution lines.A novel fault restoration strategy based on local information is proposed to solve this *** strategy firstly splits a double-ended power supply network into two single-ended power supply networks through the timing difference characteristics of a hybrid direct current circuit breaker(HDCCB)entering the ***,a method based on the characteristic of the transient energy of fault current is proposed to screen the faulty branch line in each single-ended power supply ***,a four-terminal flexible DC distribution network with MBLs is constructed on PSCAD to demonstrate the efficacy of the proposed *** factors such as noise,fault location,and DC arc equivalent resistance are considered in the simulation model for *** results prove that the proposed strategy for fault restoration is effective,and features high performance and scalability.

关键词： Flexible DC distribution network pole-to-pole fault fault restoration strategy reclosing strategy transient energy of fault current

Evaluation method for electromagnetic interference complexity of high voltage switch based on feature extraction and GCC-GRU network

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High Voltage 2024年第3期9卷 749-761页

作者： Wenchao Lu jiandong duan Lin Cheng Jiangping Lu Jiaxin Tao Jianning Yin School of Electrical Engineering Xi'an University of TechnologyXi'anChina Power Research Institute of State Grid Shaanxi Electric Power Co. LtdXi'anChina

When some new-type sensors are subjected electromagnetic interference(EMI),the traditional standard can no longer serve as the guidance for their EMI ***,it is necessary to evaluate the complexity of the new sensing equipment's suffering from electromagnetic interference.A hybrid method of feature extraction and complexity evaluation of Electromagnetic Interference signals based on generalised correntropy criterion(GCC)is ***,a variational mode decomposition al-gorithm for adaptive extraction of decomposed signals is constructed using GCC,and Generalised S-transform is used for processing and ***,according to the time-frequency space model,a new quantitative evaluation criterion interference factor is proposed,which overcomes the shortcomings of the traditional qualitative classification and the inability to solve the cross classification of ***,the Gated Recurrent Unit is introduced,and the GCC-GRU evaluation model with GCC as the loss function is *** authors conduct EMI tests and measured signal eval-uation with Medium Voltage and High Voltage switches,and the results show that the method proposed is correct and effective.

关键词： complexity criterion network

Passive control of chaotic oscillation in interconnected two-machine power system 36

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Passive control of chaotic oscillation in interconnected two...

Fault Location Method Based on EEMD and Traveling-Wave Speed Characteristics for HVDC Transmission Lines

第36届中国控制会议

作者： Darui Zhu Rui Wang Wenchao Zhang jiandong duan School of Automation and Information Engineering Xi'an University of Technology School of Water Conservancy and Hydro-Electric Power Xi'an University of Technology

ISBN: (纸本)9781538629185

By analyzing the chaotic oscillation of the power system, the second-order mathematical model is obtained by simplifying the interconnected two-machine power system model. The nonlinear behavior of the system is analyzed by three aspects, such as: the phase diagram, Lyapunov exponent and bifurcation diagram. Based on passive control theory of nonlinear system, the passive controller is designed which makes the system is passivity and maintaining internal stability for achieving the control of the chaotic system. In numerical simulations, the designed passive controller is added to the chaotic oscillation system at t=30s. The simulation results show that the system is stabilized to its equilibrium point and verified the correctness of the theoretical analysis.

关键词： Power system chaotic oscillation bifurcation passive control

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Journal of Power and Energy Engineering 2015年第4期3卷 106-113页

作者： Jing Liu jiandong duan Hailong Lu Yuanbing Sun Department of Electrical Engineering Xi’an University of Technology Xi’an China

This paper presents a method of Traveling Wave Fault location based on the improved Hilbert- Huang Transform. First, Intrinsic Mode Functions (IMF) of traveling waves are extracted by Ensemble Empirical Mode Decomposition (EEMD). Then Hilbert Transform is applied to calculate the corresponding instantaneous frequency of the highest frequency component (IMF1), the instantaneous frequency and corresponding time-frequency graph are obtained. Second, the arrival time and speed can be detected by the first instantaneous frequency’s mutational point. Finally, the improved two-terminal traveling wave fault location principle is used to calculate the fault distance. Relevant simulation results are performed to verify the correctness of the method by EMTDC software.

关键词： Traveling Wave Fault Location EEMD Instantaneous Frequency

基于改进差分进化法的含双馈型风电场的配电网无功优化

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电力自动化设备 2013年第11期33卷 123-127,133页

作者：段建东杨杉西安理工大学自动化与信息工程学院陕西西安710048

以双馈型风电机组为研究对象,建立以风电无功功率、并联电容器投运组数为优化变量,以电压稳定性最好、电压偏差最小和有功网损最小为目标的无功优化模型。在对差分进化方法进行改进的基础上,研究基于改进差分进化法的含双馈型风电场的... 详细信息

以双馈型风电机组为研究对象,建立以风电无功功率、并联电容器投运组数为优化变量,以电压稳定性最好、电压偏差最小和有功网损最小为目标的无功优化模型。在对差分进化方法进行改进的基础上,研究基于改进差分进化法的含双馈型风电场的配电网无功优化算法。在IEEE 33节点系统中进行算例测试,结果验证了无功优化算法的有效性,合理调度双馈风力发电机有利于配电网的运行优化与电能质量的改善。

关键词：双馈风力发电机差分进化法无功优化风电场模型

基于扩张状态观测器的并联直流变换器增强控制策略

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电机与控制学报 2024年第6期28卷 1-12页

作者：段鸣航段建东王露霄孙力哈尔滨工业大学电气工程及自动化学院黑龙江哈尔滨150001

为进一步改善并联直流变换器在多种内外部扰动下的动态性能,提出一种基于双闭环扩张状态观测器(ESO)的增强控制策略。该策略将比例调节器与ESO相结合,然后分别应用于公共电压外环和各个电流内环,实现各功率单元的动态均流,也强化对输入... 详细信息

为进一步改善并联直流变换器在多种内外部扰动下的动态性能,提出一种基于双闭环扩张状态观测器(ESO)的增强控制策略。该策略将比例调节器与ESO相结合,然后分别应用于公共电压外环和各个电流内环,实现各功率单元的动态均流,也强化对输入电压扰动的抑制能力,且无需额外传感器。首先,根据并联变换器的状态方程,推导内环电流ESO控制的表达式。然后,根据电流闭环极点的分布情况,从理论上分析ESO型电流内环在输入电压扰动抑制方面强于比例积分型电流内环的原因。此外,借助伯德图,给出ESO型电流内环对电感失配的鲁棒性更强并能有效消除动态电流偏差的理论依据。最后,使用三相buck变换器进行不同方案的对比验证,实验结果证明了所提策略在改进动态性能方面的有效性和先进性。

关键词：并联直流变换器扩张状态观测器双闭环控制参数鲁棒性扰动抑制动态均流

利用同步挤压小波变换的高压交直流混联系统交流线路暂态方向保护

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中国电机工程学报 2019年第13期39卷 3833-3841页

作者：段建东李浩雷阳赵召西安理工大学电气工程系陕西西安710048 西安热工研究院西安热工研究院有限公司陕西西安710054 陕西省地方电力(集团)有限公司咸阳供电分公司陕西咸阳712000

大型交直流电网混联深度不断增大而呈现出的复杂故障特性,对故障识别与清除的快速性提出了更高要求。依据混联系统交流侧线路的故障暂态特征,该文提出一种暂态方向保护方法,比较正、反向电流暂态分量中的高频能量构成故障方向识别的判... 详细信息

大型交直流电网混联深度不断增大而呈现出的复杂故障特性,对故障识别与清除的快速性提出了更高要求。依据混联系统交流侧线路的故障暂态特征,该文提出一种暂态方向保护方法,比较正、反向电流暂态分量中的高频能量构成故障方向识别的判据。其中电流暂态分量的提取及其高频能量的表征经由新颖的同步挤压小波变换完成。在实际交直流混联系统参数建立的EMTDC仿真模型上进行大量测试,并且与传统连续小波变换相比较,结果显示所提暂态方向保护在不同故障初始相位角、故障类型、故障距离、故障过渡电阻以及不同线路长度下是可靠的,且灵敏度高,时间窗短,动作超高速。

关键词：高压交直流混联系统超高速方向保护暂态量同步挤压小波变换

基于超级电容储能的微型燃气轮机发电系统功率平衡控制

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电力自动化设备 2017年第2期37卷 126-133页

作者：王帅段建东孙力凡绍桂哈尔滨工业大学电气工程系黑龙江哈尔滨150001

针对传统微型燃气轮机(简称微燃机)发电系统微电网运行时存在的冲击性负载问题,从其工作机理角度分析,发现根源在于微燃机输出功率调节响应较慢。为了弥补微燃机输出瞬时功率的不足,提出了冲击补偿的瞬时功率快速控制方法。通过微燃机... 详细信息

针对传统微型燃气轮机(简称微燃机)发电系统微电网运行时存在的冲击性负载问题,从其工作机理角度分析,发现根源在于微燃机输出功率调节响应较慢。为了弥补微燃机输出瞬时功率的不足,提出了冲击补偿的瞬时功率快速控制方法。通过微燃机发电机组自身功率响应预测进行瞬时补偿功率控制,基于超级电容储能单元的高功率动态响应弥补微燃机输出功率动态响应低的问题,使系统实时处于瞬时功率平衡状态,保证直流母线电压的平稳,增强微燃机发电系统对冲击性负载的适应能力。最后在实验平台上对所提控制策略的正确性和可行性进行了验证。

关键词：微型燃气轮机发电冲击负载超级电容储能功率控制

储能型功率补偿系统的控制及其储能元件参数设计

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电网技术 2015年第2期39卷 568-574页

作者：李伟吴凤江段建东孙力哈尔滨工业大学电气工程及自动化学院黑龙江省哈尔滨市150001

为优化柴油发电机组(diesel generator,DG)的动态输出电能质量,将包含超级电容(super capacitor,SC)的储能型功率补偿系统(storage energy-power compensation system,SE-PCS)与DG相并联共同为负载供电。提出用于SE-PCS的基于e指数函数的动态参考有功功率生成方案。在负载突变时,由SE-PCS按照e指数函数短时输出有功功率以提高DG的动态输出性能。给出了e指数函数的初值、时间常数以及SC容值的设计原则。进一步分析了SC内阻对SC输出电压范围的影响,进而给出了新的保持SC输出电压范围不变的SC容值设计原则,以保持系统的安全可靠运行。相应的仿真结果证明了所提出的方案、控制策略及参数设计原则的正确性和有效性。

关键词：柴油发电机组超级电容功率补偿参数设计