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Guaranteed Conversion From Static Measurements Into Dynamic Ones Based on Manifold Feature Interpolation
IEEE Transactions on Power Systems
Year: 2025 | Early Access Article |
The increasing penetration of renewable energy sources, coupled with the variability of loads such as Electric Vehicles (EVs), is leading to stability issues in power systems. Addressing this problem requires dynamic measurements. However, there may be a limited number of High-Resolution (HR) meters, such as Phasor Measurement Units (PMUs), especially in distribution grids. In contrast, there are ...Show More
Intrinsic and Extrinsic Learning Framework for Multi-Equipment Incipient Fault Detection and Classification
Lixian Shi;Yang Weng;Qiushi Cui;Xiaodong Zheng;Wenyuan Li;Jian Li
Incipient faults (IFs) are the precursors of power equipment failures. Due to the low occurrence frequency, IF data are scarce. The scarcity of IFs leads to the difficulty of identifying IFs. Traditional methods lack the ability to learn rich and meaningful representations of IF data, especially under the circumstance of limited IF data. Besides, some methods that involve transforming waveforms in...Show More
Low-Dimensional ODE Embedding to Convert Low-Resolution Meters Into “Virtual” PMUs
Power systems are integrating uncertain generations, demanding transient analyses using dynamic measurements. However, High-Resolution (HR) Phasor Measurement Units are few. The aim is to interpolate dynamic data for extensive but Low-Resolution (LR) meters. Existing interpolation methods capture data correlations but ignore the governing equations, i.e., Ordinary Differential Equations (ODEs) or ...Show More
A High-Sensitivity Current Differential Protection for Renewable Energy Station
Wei Zhou;Jindao Zhang;Chaofan He;Zhengqian Han;Chen Lan;Huaiyu Zhang;Xiaodong Zheng
2024 3rd International Conference on Power Systems and Electrical Technology (PSET)
Year: 2024 | Conference Paper |
With the integration of large-scale renewable energy, the fault characteristics of the renewable energy outgoing line have undergone significant changes, leading to the sensitivity decrease or even rejection of traditional ratio restraint current differential protection. Through rewriting the protection criterion and constructing the composite sequence network during fault, this paper investigates...Show More
Wind-Storage Combined System Flexible Inertia Control Strategy Based On Minimum System Inertia Demand Estimation
Chaofan He;Jindao Zhang;Song Huang;Zhengqian Han;Chen Lan;Xingqian Zhao;Xiaodong Zheng
2024 4th Power System and Green Energy Conference (PSGEC)
Year: 2024 | Conference Paper |
The inertia of power grid has decreased recently as a result of the widespread connection of wind power, which has negatively impacted the frequency stability of the system. This paper proposes an inertia demand-based wind-storage combined system inertia control strategy to overcome these issues. First, the minimum inertia demand of new energy is estimated based on system frequency safety constrai...Show More
Protection Scheme for Flexible HVDC Transmission Line Based on Virtual Impedance Voltage Characteristic
Haotian Cheng;Kunqi Jia;Yinjing Xiao;Chenxu Chao;Yulong Wang;Xiaodong Zheng
2024 9th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2024 | Conference Paper |
The traditional flexible HVDC system protection scheme based on boundary conditions uses current-limiting reactors to extract fault features. When the size of the reactor is limited by the actual engineering, there is a problem that the protection is difficult to identify the fault. This paper takes the flexible HVDC transmission line as the research object. Considering the limited value of the cu...Show More
Collaborative Solution of Distance Protection and Dual Current Control for Outgoing Lines of Inverter-Based Resources During Line-to-Line Faults
Chenxu Chao;Xiaodong Zheng;Yang Weng;Zhongping Liu;Hai Ye;Hulin Liu;Huaiyu Zhang;Yu Liu;Yulong Wang;Nengling Tai
IEEE Transactions on Smart Grid
Cited by: Papers (3)
Unlike synchronous generators (SGs), inverter-based resources (IBRs) exhibit unique fault behaviors. These fault behaviors include limited fault current amplitude, controlled fault current phase, and unsteady sequence impedance. The unique fault behaviors of IBRs, combined with the absence of zero-sequence current, can lead to the malfunction of IBR-side distance protection on outgoing lines of IB...Show More
High-Sensitivity Differential Protection for Offshore Wind Farms Collection Line With MMC-HVDC Transmission
Chenxu Chao;Xiaodong Zheng;Yang Weng;Hai Ye;Zhongping Liu;Hulin Liu;Yu Liu;Nengling Tai
When single-phase-to-ground (SPG) or phase-to-phase (PP) faults occur on collection lines of an offshore wind farm with modular multilevel converter-based high voltage direct current (MMC-HVDC) transmission, the fault current level may be low or even approach zero due to the controlled current at both ends of the collection line. As a result, the traditional current differential protection may mal...Show More
Hd-Deep-EM: Deep Expectation Maximization for Dynamic Hidden State Recovery Using Heterogeneous Data
IEEE Transactions on Power Systems
Cited by: Papers (7)
Uncertain power generations and loads are continually integrated into the power system, causing high risks of dynamic events. To better monitor systems, advanced meters like Phasor Measurement Units (PMUs) can record high-resolution system dynamic states in real time. However, due to the high cost, the placement of PMUs is limited in a system. Thus, it's hard to obtain all the dynamic system state...Show More
High-frequency fault voltage-based phase selector for photovoltaic power plant outgoing lines
12th International Conference on Renewable Power Generation (RPG 2023)
Year: 2023 | Conference Paper |
The fault characteristics of photovoltaic (PV) power plant are influenced by inverter control strategy, resulting in the malfunction of traditional power frequency phase selection method. Theoretical analysis indicates that inverters can be approximate to linear components in high-frequency superimposed network and its impedance tends to stabilize. On this basis, we analyse the characteristics of ...Show More
Challenges and prospect of relay protection in power grids with large-scale renewable power
S. Huang;J. Zhang;J. Meng;H. Zhang;C. Lan;Y. Xie;X. Zheng;N. Tai
12th International Conference on Renewable Power Generation (RPG 2023)
Year: 2023 | Conference Paper |
With the application of large-scale renewable power generation and power electronic equipment, the fault characteristics of power grids have been significantly altered. Unlike synchronous generators, the fault characteristics of power electronics are primarily determined by their control strategy, resulting in reduced adaptability of traditional protection methods. Therefore, it is imperative to r...Show More
Differential Protection Sensitivity Enhancement Scheme for AC Transmission Lines Connecting to VSC-HVDC Station
Huaiyu Zhang;Zhongping Liu;Hulin Liu;Yong Hou;Chen Lan;Xiaodong Zheng
2023 IEEE International Conference on Advanced Power System Automation and Protection (APAP)
Year: 2023 | Conference Paper |
With the vigorous development of renewable energy and the popularization of HVDC transmission, the structure of power sources has changed a lot. The output current amplitude of power electronic devices is limited, the phase angle of current is controlled, and the characteristics of the sequential component are affected by the converter control strategy, which are different from fault characteristi...Show More
High Sensitivity Differential Protection for AC Line in MMC-HVDC System
Qian Zhao;Haotian Cheng;Xiaodong Zheng;Zhongping Liu;Huaiyu Zhang;Yinjing Xiao;Haoran Liu;Huayanran Zhou
2023 IEEE International Conference on Advanced Power System Automation and Protection (APAP)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
Due to the influence of MMC control mode, the differential protection of AC transmission line in MMC-HVDC system has low sensitivity. To solve this problem, a high sensitivity differential protection scheme based on phase correction is proposed. The phase offset affected by the control link is calculated and the additional phase Angle is obtained. The additional phase Angle is introduced in the ca...Show More
A Novel Principle of Current Differential Protection for Renewable Energy Station
Chen Lan;Song Huang;Jindao Zhang;Jing Meng;Huaiyu Zhang;Xiaodong Zheng
2023 IEEE International Conference on Advanced Power System Automation and Protection (APAP)
Year: 2023 | Conference Paper |
In the context of building a new power system dominated by renewable energy sources, the integration of high proportion of renewable energy and high proportion of power electronic equipment imposes stricter requirements on power system protection. The current differential protection, as the main protection for the outgoing line of renewable energy stations, has a significant impact on the developm...Show More
Robustly optimal operation in inverter-dominant microgrids facilitating small-signal stability
12th International Conference on Renewable Power Generation (RPG 2023)
Year: 2023 | Conference Paper |
Towards the carbon neutrality, more renewable energy sources (RESs) are integrated to the power system whose inevitably intermittent nature and sudden fluctuations may jeopardize the system stability. Therefore, the conventional robustly optimal energy management alone is not sufficient because the negative impact on the small-signal should be mitigated. This paper proposes a robust optimization m...Show More
Reliability analysis of phase differential protection for PV outgoing circuit fault
D. Yang;H. Yang;K. Chen;H. Shi;M. Shi;H. Cheng;X. Zheng;N. Tai
12th International Conference on Renewable Power Generation (RPG 2023)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
In the photovoltaic connected distribution system, the photovoltaic is connected to the AC grid through the inverter. It brings great challenges to the protection of the AC outgoing line. When a fault occurs on the AC side, the fault current phase presents a controlled characteristic. The control mode of the inverter has great influence on the fault current, and the negative sequence current suppr...Show More
Adaptability analysis of current differential protection for renewable energy station outgoing line
C. Lan;X. Zheng;H. Zhang;C. Chao;N. Tai;D. Yang;S. Huang;J. Zhang;J. Meng;M. Guo;K. Chen;H. Shi
12th International Conference on Renewable Power Generation (RPG 2023)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
To achieve carbon peaking and carbon neutrality goals, it is necessary to build a new power system with renewable energy as the main body. In this context, the integration of high proportion of renewable energy and high proportion of power electronic equipment imposes stricter requirements on power system relay protection. The current differential protection, as the main protection for the outgoin...Show More
Protection scheme for the flexible DC transmission based on the calculated impedance of converter
12th International Conference on Renewable Power Generation (RPG 2023)
Year: 2023 | Conference Paper |
The flexible DC transmission system based on modular multilevel converter (MMC) responds quickly, and the control signal changes rapidly after DC fault. This paper analyzes the response characteristics of current control signal and voltage control signal in the MMC after a fault, and proposes a new protection scheme for flexible DC transmission lines based on calculated impedance. The calculated i...Show More
A novel distance protection for phase-to-phase short-circuit fault on AC collection line in VSC-HVDC system with offshore wind farm integration based on measured impedance correction
H. Zhang;X. Zheng;Z. Liu;H. Liu;H. Ye;Q. Gui;C. Lan;C. Chao;Y. Xie;N. Tai
12th International Conference on Renewable Power Generation (RPG 2023)
Year: 2023 | Conference Paper |
Nonlinear fault response of power electronics poses challenges to the reliability of protection. As the power electronic converters being connected to both ends of the AC collection line in the VSC-HVDC system with offshore wind farm integration, the fault characteristics of the AC collection line has completely changed, and the adaptability of protection is seriously affected. Distance protection...Show More
Improved Fault Phase Selection Scheme for Lines Terminated by Inverter Based Resources
2023 IEEE Power & Energy Society General Meeting (PESGM)
Year: 2023 | Conference Paper |
Cited by: Papers (2)
With more renewable energy integrated to the grid in the form of inverter based resources (IBRs), traditional current-based fault phase selector encounters limitations. The causes of this problem are the weak infeed feature and variation of source impedance of IBRs. This paper proposes an improved fault phase selection scheme to solve this problem. Firstly, the reasons for the failure of tradition...Show More
Protection Scheme for Hybrid Cascade HVDC Transmission Line Based on Current Control Adjustment Deviation
Jiangming Shen;Haotian Cheng;Zhongping Liu;Hai Ye;Hulin Liu;Qiang Gui;Xiaodong Zheng;Nengling Tai
2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)
Year: 2023 | Conference Paper |
Hybrid cascaded high voltage direct current (HVDC) transmission adopts the form of modular multilevel converter (MMC) and line-commuted converter (LCC) in series, which not only reduces the investment cost, but also reduces the fault current. In this paper, the topology and control strategy of the hybrid cascade HVDC transmission system is introduced firstly. Then, the fault characteristics of cur...Show More
Coordinated Control Strategy for Fault-Blocking of Modular Multilevel Converter in Hybrid Cascaded Ultra High Voltage Direct Current Transmission Systems Based on Protection Signal
Haotian Cheng;Jiangming Shen;Zhongping Liu;Hai Ye;Hulin Liu;Jun Han;Xiaodong Zheng;Nengling Tai
2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)
Year: 2023 | Conference Paper |
For the abnormal phenomenon of non-faulty MMC after fault MMC blocking in Hybrid Cascaded Ultra High Voltage Direct Current (HC-UHVDC) transmission system, a coordinated control strategy based on control signals is proposed. The mechanism of overcurrent and overvoltage in non-fault MMC was analyzed. Additional current was added in the LCC rectifier control to suppress overcurrent and overvoltage. ...Show More
Coordinated Control Strategy for Fault-Blocking of Modular Multilevel Converter in Hybrid Cascaded Ultra High Voltage Direct Current Transmission Systems Based on Protection Signal
Haotian Cheng;Jiangming Shen;Zhongping Liu;Hai Ye;Hulin Liu;Jun Han;Xiaodong Zheng;Nengling Tai
Year: 2023 | Conference Paper |
High-Frequency Fault Analysis-Based Pilot Protection Scheme for a Distribution Network With High Photovoltaic Penetration
Xiaodong Zheng;Chenxu Chao;Yang Weng;Hai Ye;Zhongping Liu;Piao Gao;Nengling Tai
IEEE Transactions on Smart Grid
Cited by: Papers (29)
Due to the influence of inverter control, the short-circuit current provided by distributed photovoltaics (PVs) exhibits new characteristics, such as a controlled amplitude and phase angle, resulting in the malfunction of the current protection and differential protection of distribution networks with high PV penetration. In this paper, the equivalent high-frequency impedance model (EHFIM) of PV p...Show More
High Frequency Component-Based Pilot Protection for Photovoltaic Station Collection Line
Yaoyao Zhang;Hulin Liu;Hai Ye;Jun Han;Chenxu Chao;Xiaodong Zheng
2022 4th International Conference on Smart Power & Internet Energy Systems (SPIES)
Year: 2022 | Conference Paper |
The output current phase of photovoltaic power generation unit is affected by inverter control, and photovoltaic power generation unit presents weak feedback characteristics, resulting in the current differential protection and pilot protection of collection line in photovoltaic station may malfunction. This paper analyzes the fault high-frequency additional network of the collection line of photo...Show More
HVDC Line Fault Location Using Wavelets to Mitigate Impact of Frequency Dependent Line Parameters
2022 IEEE Power & Energy Society General Meeting (PESGM)
Year: 2022 | Conference Paper |
Cited by: Papers (3)
Accurate fault location method is beneficial since it reduces the power outage time and operational costs. This paper proposes a time domain Bergeron model based method to accurately locate faults in HVDC transmission lines. The line mode and high frequency component of measurements are utilized. In addition, the method utilizes wavelets to choose the proper line parameters used in the fault locat...Show More
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