Xiangwu Yan

North China Electric Power University

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Xinxin Liu

Zunyi Medical University

Weichao Zhang

North China Electric Power University

Heming Li

Xi'an Jiaotong University

Weifeng Peng

North China Electric Power University

Junda Lu

North China Electric Power University

Jinhui Tang

Nanjing University of Science and Technology

Giri Venkataramanan

University of Wisconsin–Madison

Sen Cui

North China Electric Power University

Yang Cui

University of Science and Technology Liaoning

Yun-Fan Cheng

Sun Yat-sen University

Cooperative Institutions

North China Electric Power University

State Grid Corporation of China (China)

China Electric Power Research Institute

Nanjing University of Science and Technology

Shanghai Jiao Tong University

Chinese Academy of Sciences

Xi'an Jiaotong University

University of Science and Technology Liaoning

University of Wisconsin–Madison

Jiangsu University

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Evaluation the effect of voltage sags due to grid balance and unbalance faults on DFIG wind turbines

International Conference on Sustainable Power Generation and Supply (2009)

Xiangwu Yan Giri Venkataramanan P.S. Flannery Yang Wang

This paper demonstrated the dynamic behavior of DFIG wind turbine during grid balance and unbalance faults by using simulation results, the effect of voltage sag on DFIG wind turbine is discussed through comparing of the different voltage sag depth in a type of fault lengthways and comparing one type of fault with another breadthwise. The response characteristics of DFIG wind turbine under PCC voltage sags are summarized by a typical example. Finally it is clear that some countermeasures on the rotor side convertor or the stator side must be taken into account for DFIG wind turbine ride through PCC extreme voltage sag.

Voltage Sag

Grid code

10.1109/supergen.2009.5348141

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Citations (11)

Voltage Flicker Detection Based on Chirp-z Transform

Wei Kang Jing Guo Heming Li Xiangwu Yan

Studying of the IEC flicker meter shows that the instantaneous flicker sensation level S can be calculated directly if the spectrums of fluctuating component of voltage are known. In this paper a novel flicker measurement method is proposed. First, the square demodulation is used to obtain the fluctuating component of voltage, and then the chirp-z transform (CZT) is used to get the amplitude and the frequency of wave component, and final the instantaneous flicker sensation level S. To process the wave component by CZT can acgwire precise spectrums without prolonging the sampling time and decrease the error produced by spectrum leakage. The IEC flicker meter and new method is compared in simulation and test. The result verified the correctness and efficiency of the theoretical prediction.

Chirp

10.1109/appeec.2010.5448684

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Citations (3)

Control Method of Parallel Inverters with Self-Synchronizing Characteristics in Distributed Microgrid

Energies (2019)

Xiangwu Yan Yang Cui Sen Cui

The centralized control mode is no longer applicable for microgrid operation due to the high penetration rate of distributed energy, which is responsible for the widespread interest in the use of the distributed microgrid. Focusing on the issues of power coupling and uncontrollable droop coefficient at the terminal of the connecting line between the micro-source and AC bus, which is rarely considered, this paper proposes an improved virtual synchronous generator (VSG) control strategy based on local data considering precise control of the droop coefficient and realizing the power decoupling and the expected droop characteristics. Then, combined with the virtual rotor characteristic matching method, the reasonable active and reactive power sharing of the parallel microgrid inverters are realized in terms of static and dynamic performance without additional improvement of reactive power control. Finally, the effectiveness and feasibility of the proposed method are verified based on the MATLAB/Simulink simulation platform. The combination of the proved strategy and matching principle endows inverters with self-synchronization characteristics, forming the self-synchronizing voltage sources, which gives the distributed microgrid a higher self-stability, autonomy and robustness to ensure the stable operation of the microgrid.

Microgrid

Synchronizing

Decoupling (probability)

Robustness

10.3390/en12203871

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Citations (9)

Dynamic power distribution strategy based on virtual rotor excitation characteristic and stator impedance

Xiangwu Yan Yun-Fan Cheng Tiancheng Deng Weichao Zhang Tianqi Hua

In order to achieve stable operation of parallel system of distributed generation units and traditional generators, the Virtual Synchronous Generator (VSG) concept was proposed. To resolve the power distribution problem of parallel system, the paper first establishes mathematical model of inverter-dominated distributed generation unit controlled as VSG technology, and investigates active power and reactive power regulation scheme based on virtual rotor excitation characteristic and stator impedance characteristic. Then, after deeply analyzing the limitation of traditional droop control strategy applied to VSG system, the paper proposes an improved droop control strategy of voltage feed-forward current compensation. By adopting the established model and improved control strategy, the active power and reactive power can be automatically distributed by the capacities of the micro-sources. More importantly, the parallel system can keep stable operation under condition of great load fluctuation. At last, the paper builds multi-inverters parallel system adopted VSG control strategy on PSCAD/EMTDC. The simulation results confirm the validation and feasibility of the proposed model and control strategy.

Synchronous motor

10.1109/ipemc.2016.7512596

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Multi-objective optimization design for active damping LCL grid-connected

International Conference on Renewable Power Generation (RPG 2015) (2015)

Xiangwu Yan Jinhui Tang Ye Zhang Weichao Zhang

LCL filters, as the interface between the grid-connected inverters and the grid, overcome some of drawbacks of L or LC filters, especially have great performance used in medium and high power range situation. Methods of introducing passive damping and active damping are used to solving the stability problem around the resonance frequency. This paper purposed an active damping method based on introducing capacitor current feedback which can effectively control current resonance without changing the resonance frequency of LCL filter and avoid increasing wastage and reducing system efficiency. On the basis of above research, synthetically considering current attenuation ratio, transfer function amplitude and cost of the filter, the multi-objective optimization model of active damping LCL filter and optimization algorithm based on NSGA-Ċ are presented. Effectiveness of the optimization method is verified by simulations on PSCAD.

10.1049/cp.2015.0385

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Research on Power Supply Mode for Electric Vehicle Charging Devices in Residential Community

2021 IEEE Vehicle Power and Propulsion Conference (VPPC) (2013)

Xiangwu Yan Ri En Yanyan Li

In recent years, electric vehicles have an extraordinary development in many countries of the world because of their advantages of emission-free, energy saving and high efficiency. With the increasing use of residential parking with charging piles for electric vehicle, the charge of electric vehicle will have significant impacts on planning and operation of residential distribution system. Firstly, the impacts of on-board charging devices with different electrical characteristics on alternating current power supply were discussed. Additionally, the electrical effects of electric vehicle integration into three typical residential communities were demonstrated. By evaluating harmonic in residential distribution system, three-phase unbalance degree and voltage deviation, two suitable power supply mode for electric vehicle charging devices in residential community and possible entry approval standards of on-board charger were proposed.

Mode (computer interface)

Single-phase electric power

10.1109/vppc.2013.6671706

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Citations (2)

Comprehensive compensation method for co‐phase power supply in electrified railways based on V/v transformer and electromagnetic single‐phase var compensator

IET Generation Transmission & Distribution (2024)

Xiangwu Yan Weilin Wu Chen Shao Weifeng Peng

Abstract To solve the problem of negative‐sequence and reactive power in electrified railway, this paper proposes a comprehensive compensation method based on V/v transformer and electromagnetic single‐phase var compensator (ESVC) for co‐phase power supply. First, based on the principles of static var generator and single‐phase rotary phase shifting transformer, the topology and model of ESVC have been established, and the compensation mechanism has been analysed. Second, the topological structure and mathematical model of co‐phase power comprehensive compensation device (CPCD) are put forward based on the principles of V/v transformer and ESVC, and the operation mode of CPCD in multiple scenarios is designed. Then the strategy of CPCD with double closed loop control is analysed: corresponding compensation mode is selected according to negative‐sequence unbalance degree and expected power factor value. In this strategy, the compensated current output by ESVC is taken as the quantity of external loop control, and the rotation angle of ESVC is taken as the quantity of internal loop control to realize double‐closed loop control of CPCD. Finally, the comprehensive CPCD compensation model is built on the simulation platform and validated the accuracy of the mathematical model and the effectiveness of the control strategy.

Single phase

Single-phase electric power

Three-phase

10.1049/gtd2.13255

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Citations (1)

Experimental study of Micro sources inverter based on virtual synchronous generator

Huang Yibin Xiangwu Yan Dongxue Li Xinxin Liu Bo Zhang

The virtual synchronous generator (VSG) inverter implemented based on real-time workshop (RTW) is proposed. The design cycle of VSG implemented based on RTW is shown. Consulting the traditional mathematical model of synchronous generator in power system, the virtual synchronous generator model is built in MATLAB/Simulink, and realizing the model conversion to the code automatic. Then the Micro-source inverter platform is built. Comparison with the droop control strategy by experiments, it is proved that the control strategy of virtual synchronous generator is superior. The method based on RTW can reduce the time of compilation, integration and debugging, the efficiency is improved greatly on research. Finally, the method of measuring inertia and the formula are given.

Code (set theory)

10.1109/iceee2.2017.7935806

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Citations (1)

A power sharing method for inverters in microgrid based on the virtual power and virtual impedance control

Sara Yahia Altahir Xiangwu Yan Xinxin Liu

The virtual power method can effectively decouple the inverter output active and reactive power. However, in case of parallel operation the output powers may not be shared very well because of the line impedances mismatching. Therefore, if the system impedances are set to be equal through the virtual impedance loop, then the virtual power loop can successfully share the power. This simply means unifying the parallel inverters equivalent impedance magnitude and angle. Simulation results are presented to prove the effectiveness and feasibility of the proposed control method.

Microgrid

Output impedance

10.1109/cpe.2017.7915161

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Citations (10)

Reliability Assessment of Flexible Interconnected Distribution Network Based on Rotary Power Flow Controller

2022 4th Asia Energy and Electrical Engineering Symposium (AEEES) (2024)

Ming Wu Yangyang Li Geng Niu Junda Lu Nan Zheng

The high proportion of access to distributed energy sources has become an important trend in the development of new power systems. Due to the simple grid structure, traditional distribution networks will face problems such as voltage overruns and uncontrolled power flow when faced with access to diverse sources and loads. problem. This paper first analyzes the working principle of the Rotary Power Flow Controller (RPFC) composed of two Rotary Phase Shifting Transformers (RPST) and establishes its mathematical model; secondly, a distribution network power supply reliability evaluation index based on load point index and system reliability index is proposed; further, the basic framework of the distribution network reliability evaluation algorithm is established based on the Monte Carlo simulation method in the distribution network with cross-regional access of the rotary power flow controller; finally, taking the actual power distribution system in a certain area as an example, the proposed algorithm is used to calculate the impact of the regional interconnection access of the flexible interconnection device RPFC on the system reliability index. It is verified that reasonable access to RPFC can significantly improve the reliability of the distribution network.

10.1109/aeees61147.2024.10544724

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