Fang Shi

Shandong University

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i-10 index

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Hengxu Zhang

Shandong University

Mingjie Wei

China Electric Power Research Institute

Zongshuai Jin

Shandong University

Weijiang Chen

State Grid Corporation of China (China)

Zhang Li

Fudan University

Vladimir Terzija

Newcastle University

Baicong Sun

Shandong University

Xiongwei Hu

China Railway Major Bridge Reconnaissance & Design Institute (China)

Wei Xie

Shanghai Maritime University

Chen Fang

Power Grid Corporation (India)

Cooperative Institutions

Institute of High Energy Physics

234

Chinese Academy of Sciences

Shandong University

University of Chinese Academy of Sciences

China Center of Advanced Science and Technology

Jinan University

Peking University

COMSATS University Islamabad

University of Science and Technology of China

Shanghai Jiao Tong University

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Study on the output fluctuation of intermittent energy source based on NASA data

2017 2nd International Conference on Power and Renewable Energy (ICPRE) (2017)

Yi Zhang Hengxu Zhang Fang Shi Changhui Ma

The proposing of Global Energy Internet provides a golden opportunity for the worldwide development of intermittent energy source. Considering the current situation of lacking time-varying data of intermittent energy source, this paper studies the output fluctuation of intermittent energy source in Northwest China based on the data from the National Aeronautics and Space Administration (NASA) Goddard Earth Sciences Data and Information Services Center (GES DISC). The paper firstly extracts wind speed and surface net downward shortwave flux of 10 years as initial data and converts the data into generation output using specific device parameters. Then a statistical analysis is made about the regional, annual, seasonal, and day-night output of the wind and photovoltaic power. It has calculated the best capacity configuration by combining wind and solar energy to describe the complementary degree. The results suggest that annual difference between wind and PV power output is slight, while the regional, seasonal, and day-night differences are obvious, and the outputs of wind and PV are complementary. These results provide the basis to determine reserve capacity considering grid integration of renewable energy generation. These data provide decision support for the construction of wind and photovoltaic farms.

Shortwave

10.1109/icpre.2017.8390679

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Citations (1)

Modeling of electric vehicle loads applicable to power system quasi-steady state analysis

Yingle Fan Hengxu Zhang Fang Shi

Electric vehicles (EVs) are new power loads of power systems. It is important to model the charging process of EVs in power system numerical simulation. This paper proposes a methodology for modeling of EV loads applicable to power flow calculation and other quasi-steady state analysis. The numerical methodology of EV load modeling is expounded from the DC and the AC side of charging EVs. In the DC side, the constant current and the constant voltage charging processes are considered. In the AC side, the changes of the charging efficiency and power factor versus the AC frequency and voltage are analyzed. Based on the current EV market status and the development trends, four types of EV load models are calculated using this methodology. The EV load modeling methodology considers EV quantities, initial state-of-charge distributions, load change processes during charging and the effect of grid side parameters.

Constant current

10.1109/drpt.2015.7432246

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A numerical approach for macroscopic property simulation in global energy interconnection

Xueliang Yu Hengxu Zhang Fang Shi Lei Zhang Yong Zhang

The construction of global energy interconnection (GEI) enables to optimally allocate energy resources and protect the environment. Nevertheless, the promotion of GEI is still faced with many practical difficulties and shows a great number of complicated dynamic characteristics. A set of emergencies that may affect GEI is defined and modeled by autoregressive integrated moving average (ARIMA) intervention model in this paper. Then the system dynamics model describing the macroscopic property of GEI is established and the system flowchart is given. Since GEI has high-dimensional nonlinear characteristics, a numerical approach for GEI macroscopic property simulation is proposed. Improved Euler Method is adopted to solve differential and algebraic equations step by step. Effectiveness of the proposed approach is verified by the 911 Event using ARIMA intervention model and macroscopic property simulation of GEI in section IV.

Flow chart

Discrete-Event Simulation

10.1109/ei2.2017.8245275

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Nonlinearity Characteristic of High Impedance Fault at Resonant Distribution Networks: Theoretical Basis to Identify the Faulty Feeder

arXiv (Cornell University) (2020)

Mingjie Wei Hengxu Zhang Fang Shi Weijiang Chen Vladmir Terzija

Feeder identification is indispensable for distribution networks to locate faults at a specific feeder, especially when measuring de-vices are insufficient for precise locations. For the high imped-ance fault (HIF), the feeder identification is much more compli-cated and related approaches are still in the early stage. This paper thoroughly and theoretically reveals the features of dif-ferent feeders when a HIF happens at the resonant grounded neutral (RGN) network, which is the most challenging condition for feeder identification. Firstly, the diversity of nonlinearity existing in HIFs is explained from the aspect of energy. Then, the differences of nonlinearities of zero-sequence currents between healthy and faulty feeders are deduced theoretically. Variations of the detuning index and damping ratio that exist in industries are both considered. Afterward, these theoretical conclusions are verified by the HIF cases experimented in a real 10kV system. Finally, based on the theories, we discuss about why the existing approaches are not reliable enough, and suggest some improve-ments.

Identification

Basis (linear algebra)

Sequence (biology)

10.48550/arxiv.2011.07462

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Bandpass filtering scheme for improving phasor measurement accuracy

Xing-Chen Han Hengxu Zhang Fang Shi Peng Wang Yunbo Wang

The increasing penetration of the renewable energy sources have dramatically changed the dynamic characteristics of the distribution network. The distribution-level phasor measurement unit (D-PMU) has drawn worldwide attention. In order to reduce the errors caused by interharmonics in synchronous phasor measurement, this paper proposes a filtering scheme suitable for hardware devices. Firstly, the filter bank parameters are determined based on the fundamental and harmonic characteristics. Then, a scheme of extracting the fundamental wave using zero phase filtering is proposed. Finally, a scheme for extracting harmonics by combining primary filtering and least squares fitting is proposed. The simulation results and hardware test results show that the accuracy of phasor calculation is greatly improved and the robustness of the phasor measurement algorithm is significantly enhanced.

Phasor measurement unit

Robustness

Harmonic Analysis

Harmonic

10.1109/isgt-asia.2019.8881591

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Application Case of Transient Energy Method in Location of Single Phase to Ground Fault

2022 IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia) (2020)

Wei Xie Xuewen Wang Hengxu Zhang Fang Shi Xing Xiaodong

The distribution networks in China and many other countries are mostly neutral inefficiently grounding systems (NIGS), and more than 80% of the faults in the distribution networks are single phase to ground (SPG) faults. Due to the weak fault current and imperfect detection equipment configuration, the faulted line section location methods of the SPG fault in NIGS has not been effectively resolved. The development and application of μM-PMU provides more comprehensive fault information support for fault diagnosis of distribution network. When a SPG fault occurs, the transient energy of the faulted line section is greater than the sum of the transient energy of other line sections. A faulted line section location algorithm based on transient energy is proposed. The algorithm is implemented and embedded in the master station, and the corresponding interface is designed. A field test plan was designed and implemented in a 35kV distribution network. The test results show that the algorithm can locate the faulted line section efficiently.

Transient (computer programming)

Fault indicator

Line (geometry)

10.1109/icpsasia48933.2020.9208423

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Lock-out Algorithm of Active-Intervention-Type Arc Suppression Device Based on ELM

2022 IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia) (2020)

Kai Xu Peng Wang Zhang Li Fang Shi

The active-intervention-type arc suppression device can effectively prevent arc re-ignition and arc-overvoltage at the fault point in the distribution network. However, under some unfavorable working conditions, it is difficult for the device to extinguish the arc, so the corresponding equivalent circuit is established to derive the expression of the fault current. The expression shows that when low resistance ground fault occurs at the end of a long transmission line with a heavy load, the fault current may increase, so the device needs to be locked in these working conditions. The impact factors of fault current are used as the input characteristics to train the extreme learning machine (ELM) neural network, and then the performance of the neural network is verified by the test set. Finally, the simulation results show that the proposed device locking algorithm based on ELM has a high accuracy, which makes the device locked under unfavorable working conditions.

Overvoltage

Arc suppression

10.1109/icpsasia48933.2020.9208449

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Trajectory sensitivity-based emergency load shedding optimal algorithm

Xin Xu Hengxu Zhang Yun Chai Fang Shi Zhaowei Li

Huge power transmitted over long distance through some crucial lines increases the probability of a sudden loss of bulk power in the power-receiving system. To prevent such emergency from deteriorating the security of the system, an emergency load shedding model, whose objective is to minimize the total load shedding cost, is built, and then an efficient algorithm is proposed based on trajectory sensitivity. The constraints of the model include transient voltage security, transient frequency security and available load that can be shed. This problem is a large scale, nonlinear programming problem with constraints considering time-varied parameters. The mathematical model is simplified by linearizing the security constraints through trajectory sensitivity, and the consistency of the solution is guaranteed by iterative calculation. The trajectory sensitivity is utilized in guiding the search direction and accelerating the solving process. A provincial power system is used to test the validity of this algorithm.

Load Shedding

10.1109/drpt.2015.7432444

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Citations (3)

Nonlinearity Characteristic of High Impedance Fault at Resonant Distribution Networks: Theoretical Basis to Identify the Faulty Feeder

IEEE Transactions on Power Delivery (2021)

Mingjie Wei Hengxu Zhang Fang Shi Weijiang Chen Vladimir Terzija

Feeder identification is indispensable for distribution networks to locate faults at a specific feeder, especially when measuring devices are insufficient to locate faults more precisely. For the high impedance fault (HIF), the feeder identification is much more challengeable and related approaches are still in the early stage. This paper thoroughly reveals the nonlinearity characteristics of different feeders when a HIF happens at a three-wire system that is with the resonant grounded neutral (RGN). Firstly, the diversity of nonlinearity existing in HIFs is explained from the perspective of energy. Then, the nonlinearity of zero-sequence current that differs between healthy and faulty feeders are deduced theoretically. Effects of the detuning index of Petersen coil, the damping ratio of system, and the length of feeder are all considered. Afterward, these theoretical conclusions are verified by the HIF cases experimented in a real 10kV system. Finally, after indicating the problems of a classic phase-relationship-based algorithm, we suggest an improved method based on the phase differences between the harmonic currents of different feeders. The effectiveness of the method has been verified.

Harmonic

Basis (linear algebra)

Identification

Symmetrical components

High impedance

10.1109/tpwrd.2021.3074368

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Citations (24)

Transient Stability Analysis of Power System with Integration of DFIGs Based on Complementary Cluster Center of Inertia-Relative Motion

2021 IEEE 5th Conference on Energy Internet and Energy System Integration (EI2) (2020)

Yi Xiong Hengxu Zhang Fang Shi Changhui Ma

Increasing levels of wind penetration is requiring an effective analysis and assessment of the influence of wind machine on power system transient stability. This paper tries to clarify how integrated doubly fed induction generators (DFIGs) affect the transient dynamic of a power system based on complementary cluster center of inertia relative motion (CCCOI-RM). With the coordination of CCCOI-RM, the influence of integrated DFIGs is divided into two parts corresponding to the complementary cluster. Key factors that affect the complementary cluster dynamic motions with respect to the different DFIGs integration conditions are investigated. For further validate the analysis, comparative simulations of four different DFIGs integration conditions in varying DFIG capacities and synchronous generators replacements are conducted. The result shows that the generators in different cluster are affected by the integrated DFIGs in different way, which is correlated with the DFIG's access location, capacity and inertia of replaced synchronous generators.

Transient (computer programming)

Center (category theory)

Motion analysis

10.1109/ei250167.2020.9347051

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Citations (1)