Miao Zhao

Xi'an High Tech University

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Le Wang

PLA Rocket Force University of Engineering

Yuanshi Zheng

Xidian University

Jianxiang Xi

Xi'an High Tech University

Xujin Duan

State Grid Hunan Electric Power Company Limited

Dai Wan

Southeast University

Hengyi Zhou

Hunan Xiangdian Test Research Institute (China)

Liuming Mao

Hunan Xiangdian Test Research Institute (China)

Kehan Xia

Xi'an High Tech University

Jianxiang Xi

Xi'an High Tech University

Dai Wan

Anhui University

Cooperative Institutions

Hunan Xiangdian Test Research Institute (China)

State Grid Hunan Electric Power Company Limited

Xi'an High Tech University

PLA Rocket Force University of Engineering

Southeast University

Tsinghua University

Shanghai Jiao Tong University

Beijing Institute of Technology

Chinese Academy of Sciences

University of Chinese Academy of Sciences

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An Improved Method for Calculating Power Transmission Equipment Loss and Hot Spot Temperature in Distribution Network under Harmonic Disturbance

Dai Wan Fei Qi Miao Zhao Liuming Mao Xujin Duan

Distribution transformer is widely used as an important energy transmission equipment. In recent years, with a large number of non-linear loads used in power grid, the impact of harmonic pollution on the power system has become more and more serious. Harmonic disturbance affects the no-load loss, load loss and hot spot temperature of distribution transformer, thus further shortening the service life of transformer. An improved method for calculating loss and hot spot temperature is presented in this paper. Firstly, the influence of harmonics on load loss is analyzed. The load loss calculation model of transformer under different connection groups is established. Secondly, the variation of core loss with harmonic frequency and flux density is analyzed. The load loss calculation model of transformer under different connection groups is established. Finally, the temperature rise calculation model proposed by IEEE C57.110 is revised. Considering the effects of stray loss and no-load loss, a more accurate method for calculating hot spot temperature is proposed.

Energy efficient transformer

Transmission loss

Harmonic Analysis

Copper loss

Power loss

10.1109/ei247390.2019.9061860

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Citations (3)

Fully distributed secure consensualization for leaderless nonlinear multiagent systems with communication link attacks

International Journal of Robust and Nonlinear Control (2023)

Miao Zhao Jianxiang Xi Le Wang Kehan Xia Yuanshi Zheng

Abstract The secure consensualization for leaderless nonlinear multiagent systems with communication link attacks is realized in a fully distributed manner in a certain sense that the gain matrix design do not depend on the communication topology. A new virtual reference state estimator is proposed for each agent to estimate the common tracking state, which can adaptively adjust coupling strengths to counteract the influence of communication link attacks. Then, by the Lipschitz condition and the special structure property of the time‐varying nonsingular transformation matrix, the influence of the Lipschitz nonlinearity on secure consensus is linearized, and a design approach of the secure consensus control gain is given on the foundation of the linear matrix inequality. Finally, a numerical example is provided to demonstrate the effectiveness of theoretical results.

Link (geometry)

Matrix (chemical analysis)

10.1002/rnc.6802

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Citations (5)

Edge-based adaptive secure consensus for nonlinear multiagent systems with communication link attacks

Neurocomputing (2023)

Miao Zhao Jianxiang Xi Le Wang Kehan Xia Yuanshi Zheng

Link (geometry)

10.1016/j.neucom.2023.126505

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Citations (11)

Fully Distributed Secure Tracking for Leader-Following Nonlinear Multiagent Systems With Multi-Link Sequence Scaling Attacks

IEEE Control Systems Letters (2024)

Miao Zhao Jianxiang Xi Le Wang Cheng Wang Yuanshi Zheng

This letter focuses on fully distributed secure tracking control for leader-following nonlinear multiagent systems subject to multi-link sequence scaling attacks. Firstly, an edge-based adaptive secure tracking control scheme is proposed for followers to counteract the effects of multi-link sequence scaling attacks and can be implemented in a fully distributed fashion. Then, by utilizing the Lipschitz condition and the properties of the Laplacian potential, sufficient conditions for nonlinear multiagent systems with multi-link sequence scaling attacks to achieve secure tracking control are given, where the attack duration that the system can render is presented. Finally, a numerical simulation example is provided to illustrate the theoretical results.

Link (geometry)

Sequence (biology)

Tracking (education)

10.1109/lcsys.2024.3375156

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Citations (5)

An Indirect Method for Measuring Transformer Residual Magnetism

Tao Peng Dai Wan Miao Zhao Hengyi Zhou Liuming Mao

In order to solve the problem of residual magnetism measurement of the transformer, and make the estimation of the core flux in the idle state of the transformer is made to have engineering practicability, the magnetic flux in the transformer core should be correlated with the current amplitude and the phase angle at the moment of the transformer in the non-operating state. In this paper, the change law of the residual magnetism of the transformer is verified by the dynamic simulation experiment. And a scheme for measuring the residual magnetism by using the first peak current of the magnetizing inrush current is proposed. The scheme combines the DC magnetic flux curve and the peak magnetization curve to indirectly find the residual magnetism before the transformer is put into operation.

Magnetism

Inrush current

Energy efficient transformer

10.1109/ei247390.2019.9062047

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Citations (4)

Life Assessment Study on Distribution Electric Power Transmission Equipment Based on Harmonic Modified Hot Spot Temperature Calculating Model

Dai Wan Miao Zhao Xujin Duan Hengyi Zhou Liuming Mao

Distribution transformer is widely used as an important energy transmission equipment. With a large number of new energy such as photovoltaic and wind power connected to the grid, the harmonic interference in the power system becomes more and more serious. Harmonic disturbance has a continuous impact on the daily operation of distribution transformers. In this paper, the relationship between harmonic disturbance and service life of distribution transformer is studied. Firstly, combined with harmonic no-load loss and winding skin effect, the hot spot temperature calculation model is improved. Secondly, the temperature rise test is carried out to verify the accuracy of the model. Finally, based on the improved hot spot temperature calculation model, the corresponding life evaluation model of distribution transformer is proposed. The results show that the harmonic current disturbance will cause a sharp increase in the relative aging rate of the transformer and seriously shorten the life of the transformer.

Energy efficient transformer

Service life

10.1109/ei247390.2019.9061954

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Citations (3)

Adaptive Secure Consensus for Nonlinear Multiagent Systems With Distributed Sequential Link Attacks Under General Directed Graphs

International Journal of Robust and Nonlinear Control (2024)

Miao Zhao Jianxiang Xi Le Wang Hao Liu Yuanshi Zheng

ABSTRACT This article introduces a novel adaptive secure consensus strategy for achieving secure consensus in nonlinear multi‐agent systems (MASs) against distributed sequential link attacks under general directed graphs, which can be implemented in a fully distributed manner. First, communication network attacks on MASs are modeled as distributed sequential link attacks. An adaptive secure consensus protocol is then designed for nonlinear MASs to achieve fully distributed secure consensus under general directed graphs. Moreover, by decomposing the Laplacian matrix of general directed graphs, secure consensus criteria for nonlinear MASs against distributed sequential link attacks are presented, unifying leaderless and leader‐follower structures into a single control framework. Finally, the effectiveness of the proposed control strategy is demonstrated through a simulation example.

Link (geometry)

10.1002/rnc.7690

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Citations (0)

Research on the Influence of Distributed Photovoltaic Grid-Connected on the Operation Characteristics of Wide Range OLTC Transformer

Simin Peng Xujin Duan Dai Wan Miao Zhao Hengyi Zhou

After the distributed photovoltaic is connected to the distribution network, its power supply characteristics change the load characteristics of the traditional distribution network, so that the power flow of the distribution network begins to change in two directions. Terminal voltage, which puts forward higher requirements for the bidirectional voltage regulation of the wide-width on-load voltage regulating transformer. At present, there are still no authoritative and directly related technical standards for the voltage regulating part and its control part of the wide-width on-load voltage regulating transformer for reference. The relevant suggestions are put forward for the application of wide-width on-load voltage regulating transformers under grid conditions.

Tap changer

10.1007/978-3-031-31733-0_36

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Analysis of terrain navigability in underwater terrain aided navigation

Journal of Physics Conference Series (2021)

Miao Zhao Zhenyang Xu Ma Wei-qiang

Abstract Aiming at the problem that the single terrain characteristic parameter cannot comprehensively evaluate the terrain navigability of the matching areas, the weighted vector correlation degree is introduced, and the terrain characteristic parameters such as the standard deviation of terrain elevation, roughness, correlation coefficient, terrain information entropy and terrain slope are comprehensively considered. A multi-index comprehensive decision-making evaluation method based on grey fuzzy theory is proposed. In addition, aiming at the problem that different matching routes have different navigability for the specific terrain, in order to select matching routes with better navigability, a navigation coefficient based on terrain statistical parameters is proposed to analyze the navigability of different routes. And the point mass filter (PMF) algorithm is used to simulate the navigability of the matching areas with different terrain features and matching routes. The simulation results show that the proposed evaluation method and navigation coefficient are feasible in the evaluation of terrain navigability. The stronger the navigability is, the smaller the matching error is and the better the navigation performance is. This research results can provide theoretical basis for analysis of terrain navigability, selection of matching areas and matching routes planning in terrain aided navigation.

Navigability

10.1088/1742-6596/1887/1/012001

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Citations (1)

Fully distributed self-triggered secure consensus for nonlinear multiagent systems with sequential communication link scaling attacks

Applied Mathematics and Computation (2024)

Miao Zhao Jianxiang Xi Le Wang Cheng Wang Yuanshi Zheng

Link (geometry)

10.1016/j.amc.2024.129185

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Citations (0)