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A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support

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Chinese Physics B 2015年第7期24卷 52-63页

作者：沈阳武柯德平孙元章 Daniel Kirschen 王轶申胡元朝 School of Electrical Engineering Wuhan University Department of Electrical Engineering University of Washington

A novel transient rotor current control scheme is proposed in this paper for a doubly-fed induction generator（DFIG）equipped with a superconducting magnetic energy storage（SMES） device to enhance its transient voltage and frequency support capacity during grid faults. The SMES connected to the DC-link capacitor of the DFIG is controlled to regulate the transient dc-link voltage so that the whole capacity of the grid side converter（GSC） is dedicated to injecting reactive power to the grid for the transient voltage support. However, the rotor-side converter（RSC） has different control tasks for different periods of the grid fault. Firstly, for Period I, the RSC injects the demagnetizing current to ensure the controllability of the rotor voltage. Then, since the dc stator flux degenerates rapidly in Period II, the required demagnetizing current is low in Period II and the RSC uses the spare capacity to additionally generate the reactive（priority） and active current so that the transient voltage capability is corroborated and the DFIG also positively responds to the system frequency dynamic at the earliest time. Finally, a small amount of demagnetizing current is provided after the fault clearance. Most of the RSC capacity is used to inject the active current to further support the frequency recovery of the system. Simulations are carried out on a simple power system with a wind farm. Comparisons with other commonly used control methods are performed to validate the proposed control method.

关键词： doubly-fed induction generator transient rotor current control superconducting magnetic energy storage voltage support

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Smart Transformer-based Medium voltage Grid support by Means of Active Power Control

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CES Transactions on Electrical Machines and Systems 2020年第4期4卷 285-294页

作者： Stefano Giacomuzzi Marius Langwasser Giovanni De Carne Giuseppe Buja Marco Liserre Department of Industrial Engineering University of PadovaPadovaItaly Chair of Power Electronics Kiel UniversityKielGermany Institute for Technical Physics Karlsruhe Institute of TechnologyKarlsruheGermany

In the last decades the voltage regulation has been challenged by the increase of power variability in the electric grid,due to the spread of non-dispatchable generation *** paper introduces a Smart Transformer(ST)-based Medium voltage(MV)grid support by means of active power control in the ST-fed Low voltage(LV)*** aim of the proposed strategy is to improve the voltage profile in MV grids before the operation of On-Load Tap Changer in the primary substation transformer,which needs tens of *** is realized through reactive power injection by the AC/DC MV converter and simultaneous decrease of the active power consumption of voltage-dependent loads in ST-fed LV grid,controlling the ST output *** last feature has two main effects:the first is to reduce the active power withdrawn from MV grid,and consequently the MV voltage drop caused by the active current *** the same time,higher reactive power injection capability in the MV converter is unlocked,due to the lower active power *** result,the ST increases the voltage support in MV *** analysis and simulation results carried out in this paper show improvements compared to similar solutions,*** only reactive power *** impact of the proposed solution has been finally evaluated under different voltage-dependence of the loads in the LV grid.

关键词： Smart Transformer Solid State Transformers Load Control voltage support

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Research on the voltage supporting Capability of Multi-VSC-HVDC Subsystems Operation Strategy to Receiving-end LCC-HVDC Network in Weak AC Grid

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CES Transactions on Electrical Machines and Systems 2023年第1期7卷 11-20页

作者： Tao Li Yongli Li Yuchen Zhu IEEE the School of Electrical Automation and Information Engineering Tianjin UniversityTianjin300072China CES

For the hybrid multi-infeed HVDC system in which the receiving-end grid is a strong AC grid including LCC-HVDC subsystems and multiple VSC-HVDC subsystems,it has higher voltage support ***,for weak AC grid,the voltage support capability of the multi-VSC-HVDC subsystems to the LCC-HVDC subsystem(voltage support capability-mVSCs-LCC)can resist the risk of commutation *** on this consideration,this paper proposes an evaluation index called Dynamic voltage support Strength Factor(DVSF)for the hybrid multi-infeed system,and uses this index to qualitatively judge the voltage support capability-mVSCs-LCC in weak AC *** addition,the proposed evaluation index can also indirectly judge the ability of the LCC-HVDC subsystem to suppress commutation ***,the mathematical model of the power flow of the LCC and VSC networks in the steady-state is analyzed,and the concept of DVSF applied to hybrid multi-infeed system is ***,the DVSF index is also used to qualitatively judge the voltage support ***,the influence of multiple VSC-HVDC subsystems with different operation strategies on the DVSF is analyzed with reference to the concept of ***,the indicators proposed in this paper are compared with other evaluation indicators through MATLAB simulation software to verify its *** importantly,the effects of multi-VSC-HVDC subsystems using different coordinated control strategies on the voltage support capability of the receiving-end LCC-HVDC subsystem are also verified.

关键词： Hybrid multi-infeed HVDC system voltage support Multi-VSC-HVDC LCC-HVDC Commutation failure DVSF Control strategy

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A voltage-supportive Controller for Ultra-fast Electric Vehicle Chargers in Islanded DC Microgrids

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Journal of Modern Power Systems and Clean Energy 2023年第3期11卷 896-906页

作者： Noushin Poursafar Seyedfoad Taghizadeh M.Jahangir Hossain Masoud Karimi-Ghartemani School of Engineering Macquarie UniversitySydneyNSW 2109Australia School of Electrical and Data Engineering University of Technology SydneySydneyNSW 2007Australia Department of Electrical and Computer Engineering Mississippi State UniversityMississippiMS 39762USA IEEE

This paper presents a controller for fast and ultrafast electric vehicle(EV)charging *** affecting the charging efficiency,the proposed controller enables the charger to provide support to the interconnection voltage to counter and damp its *** solutions are either hardware-based such as using supercapacitors and flywheels which increase the cost and bulkiness of the charging station,or software-based such as P/V droop methods which are still unable to provide a robust and strong voltage *** paper proposes an emulated supercapacitor concept in the control system of the ultra-fast EV charger in an islanded DC ***,it converts the EV from a static load to a bus voltage supportive load,leading to reduced bus voltage oscillations during single and multiple ultra-fast EV charging operations,and rides through and provides supports during extreme external *** analysis and design guidelines of the proposed controller are presented,and its effectiveness and improved performance compared with conventional techniques are shown for different case studies.

关键词： Electric vehicle(EV) charging station ultrafast charging DC microgrid voltage support capacitor emulation

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Flywheel Energy Storage System for Power Quality Improvement Application:A Review

Flywheel Energy Storage System for Power Quality Improvement...

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作者： Chen ZHOU Hao-jie YU Wei-qiang QIU Bo YANG Yi-bin TAO Zhen-zhi LIN China Electric Power Research Institute College of Electrical Engineering Zhejiang University

Flywheel energy storage system（FESS） plays an important role in improving the power quality for the power system with high-penetration renewable energy sources,due to its advantages of high power density,quick response time,long cycle life and high energy *** paper presents a review of FESS for power quality improvement *** main components are introduced and the literatures about the development of FESS are also ***,the FESS based technology for frequency regulation and voltage support is discussed,and some recent research works and the related waveforms are reviewed to confirm the effectiveness and performance.

关键词： Flywheel energy storage system Power quality Frequency regulation voltage support

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