Xiangwu Yan

North China Electric Power University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Jiaoxin Jia

North China Electric Power University

Bo Zhang

North China Electric Power University

Waseem Aslam

University of Sargodha

Heming Li

Xi'an Jiaotong University

Hashim Hasabelrasul

Hebei Agricultural University

Aazim Rasool

North China Electric Power University

Abuzaid Saeed Gadalla

Elsheikh Abdallah Elbadri University

Chen Shao

North China Electric Power University

Lixia Zhang

China University of Petroleum, East China

Weifeng Peng

North China Electric Power University

Cooperative Institutions

North China Electric Power University

133

State Grid Corporation of China (China)

Chinese Academy of Sciences

Shanghai Electric (China)

China Electric Power Research Institute

Tsinghua University

Chongqing University

University of Chinese Academy of Sciences

China Southern Power Grid (China)

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Comparison of virtual synchronous generators dynamic responses

Xiangwu Yan Sara Yahia Altahir Mohamed

Recently, researchers have proposed different types of virtual synchronous generators and the performance has been investigated. The virtual synchronous generator has proposed with the different order such as the second order, the third order, the fifth order and the seventh order. However, the second-order model is mainly used to mimic the synchronous generator characteristics. The motivation for applying the virtual synchronous generator is its ability to contribute to the frequency control and its ability to share the load demand with other virtual synchronous generators in the same system. This paper firstly introduces a comprehensive comparison of the dynamic performance of two types of virtual synchronous generators and provides the possible results of the different types. The dynamic behaviors are compared under the parallel operation in a microgrid. Secondly, the paper develops a dynamic response control method for multi-parallel virtual synchronous generators. The control method has verified through computer simulation.

Microgrid

Synchronous motor

10.1109/cpe.2018.8372573

Cite

Citations (17)

Magnitude-phase equivalent circuit and steady-state power-angle characteristic analysis of DFIG

International Journal of Electrical Power & Energy Systems (2024)

Ruibo Li Xiangwu Yan Yanbo Wang Sen Cui Zhe Chen

Circuit model representing generator characteristics is essential in stability analysis and control system design of doubly-fed induction generator (DFIG). This paper develops the relationship between generated voltage and magnetic field in DFIG, and establishes an equivalent circuit model considering rotor motion. The novel magnitude-phase equivalent circuit (MPEC) model is established based on vector magnitude and angle. Furthermore, the paper analyzes phasor diagrams, calculates the power expression under the MPEC, and obtains steady-state power-angle characteristic of the DFIG. In the proposed power-angle characteristic, the DFIG's output incorporates variations in slip ratio and power-angle, which combines the characteristics of asynchronous and synchronous machines. Based on the proposed MPEC and power-angle characteristic, the steady-state maximum power of the DFIG is determined at the critical stable power-angle of π/2. Finally, simulation and experimental results are given to validate the effectiveness of the proposed equivalent circuit model and power-angle characteristic of DFIG. The results show that the MPEC model is capable of analyzing the DFIG stability from the power-angle motion perspective, and the system exhibits a potential for instability when the power-angle exceeds 1.5.

Phase angle (astronomy)

10.1016/j.ijepes.2023.109767

Cite

Citations (2)

Combined power decoupling strategy for inverters in low-voltage microgrids

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society (2017)

Sara Yahia Altahir Xiangwu Yan Hashim Hasabelrasul

The high R/X ratio of distributed lines in low voltage microgrid causes the coupling between the active and reactive power control. Forcing the output impedance to achieve the decoupling through additional virtual inductor impedance loop heavily causes the voltage amplitude drop at the point of common coupling. Such voltage drop deteriorates the microgrid voltage stability. To avoid the problem of the voltage drop of the traditional method, the virtual complex impedance with virtual negative resistor and virtual inductor is introduced recently. The effect of the line resistance can be counteracted by controlling the virtual negative resistor, thus the system presents mainly inductive impedance. However, it is founded that, the grid formed inverter system works under the critical stability and it is easily to pull into instability if the line resistance drifts to smaller value than the value of the virtual negative resistor. This case is very likely to happen in practical applications due to the temperature variation. To increase the stability margin of the system, this paper introduces a new method to control the inverters. Simulation results are presented to show that the new control scheme can implement the power decoupling and maintain a stable operation even for a large value of the line resistance drifts.

Voltage drop

Decoupling (probability)

Microgrid

10.1109/iecon.2017.8216164

Cite

Citations (2)

Passivity-based Control Method in Boost Chopper Type Slip Energy Recovery System

Chinese Control Conference (2006)

Xu Yanlong Ling Zhu Xiangwu Yan Qing Dong

Aiming at boost chopper type slip energy recovery system's indeterminate model and strong nonlinear character, also the disadvantage of the traditional control scheme, passivity-based control scheme is applied to solve these problems. The equivalent circuits is firstly established and then the Euler-Lagrange model. The passivity-based control scheme is deduced by using this Ruler-Lagrange model. Matlab/Simulink is used to simulate the system and good result is shown.

Passivity

Chopper

10.1109/chicc.2006.280900

Cite

Citations (0)

Electric Vehicle Battery SOC Estimation based on GNL Model Adaptive Kalman Filter

Journal of Physics Conference Series (2018)

Xiangwu Yan Yuwei Guo Yang Cui Yuwei Wang Haoran Deng

With the efficient development of the electric vehicle, it is urgent to recycle and utilize the decommissioned power battery which increases rapidly in quantity year by year. Accurate and reliable state of charge (SOC) estimation of the battery is the key technology to realize the battery cascade utilization. The traditional estimation methods do not take the self-discharge factors into account which affect the aging battery to a great extent. This research adopts the GNL circuit equivalent model, which considers the self-discharge factor and discretizes its state space equation by matrix quadratic form. The adaptive unscented Kalman filter algorithm (AUKF) is used to estimate and update the SOC in time. The experimental comparison verifies the effectiveness of AUKF for aging batteries. The results show that the proposed method can obtain less error of the state estimated value and fast following features which meets the actual demand of SOC estimation.

State of charge

10.1088/1742-6596/1087/5/052027

Cite

Citations (19)

An Electromagnetic Var Compensator Suitable for Wind Power Access and Its Control Strategy

Energies (2022)

Xiangwu Yan Yan Guo Jiaoxin Jia Waseem Aslam Bingbao Qi

As the proportion of large-scale wind farms and distributed wind power connected to the power grid increases annually, the effects of their intermittent and random characteristics on the active and reactive power fluctuations of the power grid are becoming increasingly evident, causing frequent voltage fluctuations at the grid-connected point. To solve these problems, this study proposes a new topology of an electromagnetic var compensator (EVC) based on a rotary phase-shifting transformer (RPST). The EVC can work under capacitive and inductive conditions to compensate for inductive and capacitive power, respectively. In accordance with the parallel steady-state mathematical model of the EVC, a double closed-loop control strategy with high precision and considerable robustness is proposed for the EVC on the basis of instantaneous reactive power theory. Finally, simulations show that the topology of the proposed EVC exhibits bidirectional and continuous adjustment capability that can meet the reactive power compensation requirements of power systems with a high percentage of wind power. Compared with the existing reactive power compensation device, the EVC exhibits the advantages of high voltage, large capacity, low cost, strong impact resistance, and good tolerance, imbuing it with great prospects for development.

Robustness

Volt-ampere reactive

Static VAR compensator

10.3390/en15155572

Cite

Citations (3)

A modified demodulation method for flicker measurement

2022 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM) (2006)

Wei Kang Heming Li Xiangwu Yan Lixia Zhang Sun Fei-zhou

This article analyses the square demodulation method recommended by IEC on flicker measure and calculate the error brought by this method. On the base of these analyze a new demodulation method is put forward; theoretical derivation and simulation indicate this modified method can reduce measurement error without notable increase of calculation

Base (topology)

10.1109/speedam.2006.1649872

Cite

Citations (1)

Extended Two-Terminal Network Model of Parallel VSMs for Analysis of Active Power–Frequency Response

2022 IEEE Energy Conversion Congress and Exposition (ECCE) (2020)

Jiaoxin Jia Xiangwu Yan Benshuang Qin Abubakar Siddique Bo Zhang

The disturbance types have a significant impact on the power-frequency response of multiple virtual synchronous machines (multiple VSMs). Therefore, we established an effective model to analyze the dynamic characteristics of multiple VSMs under any disturbance. Considering that the active and reactive power loops are decoupled, the model developed for the active power and frequency control loop of VSMs is equivalent to a two-terminal network that includes the first (parallel) and second (series) "admittance." The active power and angular frequency increments were analogized as the current and voltage of the circuit network. An extended two-terminal network model of the multiple-VSM parallel system was established to comprehensively and accurately depict the response of the output active power and angular frequency under disturbances of the load and active power reference. The key active power- frequency response characteristics of the multiple-VSM parallel system were deduced. The effectiveness of the proposed extended model was verified through simulations and experiments. The results indicated the suitability of the proposed model for active power-frequency response analyses of multiple-VSM parallel systems. Furthermore, the experimental results obtained under different modes agree with the theoretical analysis results, thereby validating the key conclusions.

Admittance

10.1109/ecce44975.2020.9235923

Cite

Citations (3)

Research on Dynamic Reactive Power Coordinated Control Strategy of Doubly-fed Wind Turbine Based on Improved Genetic Algorithm

2022 IEEE Energy Conversion Congress and Exposition (ECCE) (2021)

Sen Cui Xiangwu Yan Ruibo Li Wenfei Chang Waseem Aslam

Exploiting the reactive voltage regulation capability of a doubly-fed induction wind generator (DFIG) and improving the reactive power response speed of wind turbines are important tasks in enhancing a power system's voltage stability. This approach determines the reactive power distribution scheme of the two based on the regulation capacity of the stator and grid-side converter of a 1.5MW DFIG in the West Mongolia Power Grid. When the system reactive power demand surpasses the DFIG reactive power output limit, an additional active power control based on the reactive power difference is suggested. The improved genetic algorithm (IGA) is adopted to determine the additional controller parameter values. This control reduces the minimum output active power of the unit while ensuring that the reactive power output limit is increased to meet the reactive power demand of the system. Ultimately, the accuracy of the control strategy is validated through experiments.

10.1109/ecce47101.2021.9595714

Cite

Citations (3)

Transient modelling of doubly‐fed induction generator based wind turbine on full operation condition and rapid starting period based on low voltage ride‐through testing

IET Renewable Power Generation (2021)

Xiangwu Yan Sen Cui Xuewei Sun Yingyun Sun

Abstract Transient simulation model of doubly‐fed induction generator‐based wind turbine has a complex model structure and considerable control parameters. An accurate simulation model is especially important for studying the static and transient characteristics of doubly‐fed induction generator‐based wind turbine and the grid‐connected system. Based on the measured data of low voltage ride‐through testing, the integrated parameter identification method is proposed here. Combined with the time‐domain simulation analysis, curve fitting is used to determine the control strategy of doubly‐fed induction generator‐based wind turbine. The improved genetic algorithm is used to identify the generator parameters, power control parameters, and resistance of Crowbar of doubly‐fed induction generator‐based wind turbine. Combined with the electrical parameters provided by the wind turbine manufacturer, electromagnetic transient model on full operation condition and rapid starting period, corresponding to a measured doubly‐fed induction generator‐based wind turbine in West Inner Mongolia Power Grid, is then established, which can operate in the full wind speed range and quickly enter the stable state within 1 s after start‐up. Comparison of simulation results and measured data shows that the established electromagnetic transient simulation model using parameters identified by the proposed method can accurately reflect the key characteristics of doubly‐fed induction generator‐based wind turbine.

Transient (computer programming)

10.1049/rpg2.12090

Cite

Citations (4)