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State-feedback-with-PI control for NPC three-level inverter

State-feedback-with-PI control for NPC three-level inverter

引用

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Xin Liu Xinchun Lin Zhigang Liang Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology Wuhan Hubei CN

A discrete state-feedback-with-PI control scheme is proposed for NPC three-level inverter. The discrepancy between two approaches to design the controller, one in continuous domain, the other in discrete plane, is discussed. By means of continuous transformation, a load current feed-forward decoupling strategy (LCFF) is successfully proposed in this paper to make feed-forward possible for the discrete state-space controller. Based on transfer function analysis and comparison of discretized and continuous system, comprehensive verification is provided to verify the effectiveness of the derivation of the LCFF path. Simultaneously, the robustness analysis of the proposed strategy to the output impedance is also performed. Finally, experimental results are provided to verify the feasibility and validity of the proposed strategy.

关键词： Inverters State feedback Voltage control Mathematical model Poles and zeros Impedance Topology

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A Novel Traveling Wave Based Fault Location Scheme for Power Distribution Grids with Distributed Generations

A Novel Traveling Wave Based Fault Location Scheme for Power...

引用

IEEE Power and Energy Society General Meeting

作者： Xu Chen Xianggen Yin Xin Yin Jinrui Tang Minghao Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology School of Electrical and Electronic Engineering the University of Manchester

ISBN: (纸本)9781467380416

A traveling wave fault location method based on multi measuring points for distribution network with distributed generation is proposed in this paper. A novel fault location algorithm based on the time difference between the first aerial-mode and zero-mode wave-fronts of the traveling wave are used to obtain the preliminary fault location without the wide area precision time synchronization. This method acquires the information gathered by measuring points at the distribution network busbar and the terminals of the trunk feeder and the random error is eliminated by using network redundant data. It's verified that the method proposed in this paper can achieve accurate location of the fault section and fault distance for distribution network with distributed generation effectively by using the IEEE 34 node network simulation.

关键词： Distributed generation Fault location Distribution network Zero mode Line mode Fault location distributed power generation Power grids traveling waves monitoring point TimeDif

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Analysis and Control of Doubly Fed Induction Generator for Zero Voltage Ride Through

Analysis and Control of Doubly Fed Induction Generator for Z...

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International Conference on Electrical Machines and Systems

作者： Haiyan Tang Yuanzhu Chang Yongning Chi Bo Wang Yan Li Jiabing Hu State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute. Beijing 100192 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781467388634

The stator transient DC flux component emerges in the Double Fed Induction Generator (DFIG) following grid voltage dip, which results in an important influence on the controllability of rotor converter. In this paper, the research focuses on the responding time of the dynamic reactive current injection referring to DFIG with the crowbar protection under Zero Voltage Ride-Through (ZVRT). Firstly, theoretical analysis about the shortest quitting time of crowbar is carried out. Then, combined with crowbar protection and demagnetization control, ZVRT of DFIG is achieved as well as the fast injection of dynamic reactive current. Finally, the simulation results are presented to verify the theoretical analysis and the proposed control strategy. It is helpful to enhance fault ride through capability of DFIG.

关键词： Crowbar DFIG Dynamic reactive current injection ZVRT

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Simulation of volatge-maintaining performance of high energy density capacitors based on the measurement of charging current

Simulation of volatge-maintaining performance of high energy...

引用

International Conference on Pulsed Power

作者： Hua Li Wenjuan Wang Zhiwei Li Haoyuan Li Fuchang Lin Xiang Huang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei PR. China

When a high energy density (HED) capacitor is charged to a certain voltage, the voltage of the capacitor will decay gradually. In this paper, an extended Debye model of relaxation polarization is established and the parameters of the model are obtained by analysis of polarization current. The simulation of the voltage decay of HED capacitors under different field strength, temperature and charging time is conducted, which can match well with the results of the measured voltage decay. And the results indicate that increases of temperature or field strength result in great increases of the voltage decay by altering the parameters of the extended Debye model. Nevertheless, charging time has no impact on these parameters, it affects the voltage decay by affecting the charges absorbed from the power supply by relaxation polarization branches of the capacitor.

关键词： Resistance Partial discharges Temperature measurement Electronic mail Production Isothermal processes Capacitors

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Full-capacity wind turbine with inertial support by optimizing phase-locked loop

Full-capacity wind turbine with inertial support by optimizi...

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International Conference on Renewable Power Generation (RPG 2015)

作者： Wenming Tang Jiabing Hu Shuai Li Shuo Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781510821415

This paper proposes a novel inertial control method based on optimizing the dynamic response of phase-locked loop (PLL) of full-capacity wind turbine (FCWT). Different from the typical inertial control strategy with PD controller, the proposed method utilizes the phase-tracking error provided by the optimized PLL to modify the rotor speed references without detecting the grid frequency or calculating the frequency derivative. In order to realize the expected inertial response characteristic, control parameters of PLL should be optimized, and the phase-locked loop error (Δθ) should be introduced to the speed reference. The controller design follows the principle that the WT can fast response and participate in stabilizing the grid frequency based on the large amount of rotational kinetic energy stored in the rotor when frequency fluctuates in grid. With this control strategy, the kinetic energy is released and transformed to the grid directly to improve frequency stability of power grid. Simulation model was built in MATLAB/Simulink and simulated results demonstrate the feasibility and correctness of the presented control method.

关键词： full-capacity wind turbine inertial control phase-locked loop rotational kinetic energy

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The cost-efficient, common-ground, non-isolated three-port converter deduced from the single-inductor dual-output (SIDO) topology

The cost-efficient, common-ground, non-isolated three-port c...

引用

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Pengcheng Zhang Yu Chen Zhou Lu Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan Hubei China

ISBN: (纸本)9781479967360

In recent year, three-port converter (TPC) has been widely presented to connect the renewable source, energy-stored component and the load for renewable application. In this paper, a new non-isolated TPC deduced from a single-inductor-dual-output (SIDO) converter is proposed. The proposed TPC is obtained by introducing a coupling winding and a diode in the original SIDO converter. Such a derivation requires the minimal component amount and its three ports share the common ground. The derivation, operational principle and circuit analysis of the proposed TPC are presented in this paper, a prototype is also built to verify the analysis. The experimental results show the validity. Due to the compact-size, low-cost, common-ground and full-control features, the proposed TPC can be widely used in the low-power on-board applications.

关键词： Batteries Inductors Couplings Windings Stress Switches Topology

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Research on penetration level of distributed generation in distribution network

Research on penetration level of distributed generation in d...

引用

International Conference on Information Sciences,Machinery,Materials and Energy（ICISMME 2015）

作者： Jian Su Haitao Liu Hao Bai Shihong Miao Pipei Zhang China Electric Power Research Institute State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology

To ensure safety and stability of distribution network,the maximum allowable capacity of DG has a certain *** maximum allowable capacity can be defined penetration *** paper first analyses the influence caused by DG on power flow,network loss,node voltage,power quality,current protection and anti-islanding,then introduces some typical evaluation methods for penetration level of distributed generation in distribution network,these methods and conclusions can provide some references for DG planning.

关键词： distributed generation penetration level distribution network static security

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Two-Stage Optimization Method for Network Reconfiguration and Load Recovery During Power System Restoration

Two-Stage Optimization Method for Network Reconfiguration an...

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IEEE Power and Energy Society General Meeting

作者： Shiwu Liao Wei Yao Xingning Han Jinyu Wen Yunhe Hou State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Department of Electrical and Electronic Engineering The University of Hong Kong

ISBN: (纸本)9781467380416

Network reconfiguration and load recovery (NRLR) during power system restoration is a complex mixed-integer nonlinear programming (MINP) problem, which is difficult to be solved efficiently. To address this problem, this paper proposes a two-stage optimization method for NRLR. The first stage, based on the DC power flow considering frequency characteristics, focuses on the integer variables and provides the optimal plan for transmission line charging and load pick-ups. Then in the second stage, an expanded AC optimal power flow with frequency constraints and load ZIP model is established to minimize the restoration duration of the plan generated by the first stage. The comprehensive restoration plan can be obtained through the iterative optimization process. Case study is undertaken on a 10-machine 39-bus system. Simulation results reveal that the restoration plans obtained from the proposed method are highly efficient, while the computation time satisfies the requirement of online application.

关键词： Load recovery Network reconfiguration Two-stage optimization Power system restoration Power system restoration Network reconfiguration load restoration DC load flow computational time optimization method

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Penetration Capacity Calculation for Wind Farms Considering Random Output

Penetration Capacity Calculation for Wind Farms Considering ...

引用

2015 3rd International Conference on Mechanical engineering and Intelligent Systems(ICMEIS 2015)

作者： Haitao Liu Jian Su Pipei Zhang Hao Bai Shihong Miao China Electric Power Research Institute State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

The majority of the distribution network is supplied by unilateral power and has a radial distribution, wind farms connected into grid will inevitably bring a certain extent on static voltage of the distributed grid. Furthermore, the randomness of wind farm output will cause the node voltage fluctuations. This paper firstly studies the random flow calculation method including wind power, and analyzes the probability distribution of the grid voltage when wind farms with different capacity accessing by combining the Newton-Raphson method with probability theory. Then establishes a computing model of penetration capacity of wind farms with the constrain of the static voltage stability range. For different values of confidence level α, the results of penetration capacity are different, then we can choose the value α flexibility according to the distribution network security requirements.

关键词： wind farm random output probabilistic load flow penetration capacity

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An inrush current mitigation approach of The output transformer for inverter

An inrush current mitigation approach of The output transfor...

引用

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Zhi Chen Xuejun Pei Li Peng Shunchao Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology (HUST) Wuhan Hubei China

ISBN: (纸本)9781479967360

When a short circuit fault occurs on the load side of inverter, the control system based on hardware and software current limiting strategy can confine output currents to a certain value. In order to shorten outage time, output voltages should be restored to rated value as soon as possible after the fault is cleared by the circuit breaker of the faulty branch. However, the voltage recovery may cause significant inrush current phenomenon because of magnetic saturation of the output transformer. The high inrush current could lead to voltage distortion and even trigger the protection mechanism. To effectively eliminate the inrush current, this paper proposes an inrush current mitigation approach for three-phase inverter. The phase angle of recovery voltage is controlled so that it is equal to that of fault occurring, which is detected and saved utilizing the double synchronous rotating d-q transformation algorithm. Both simulation and experimental results are provided to demonstrate the feasibility of this method.

关键词： Circuit faults Surges Surge protection Inverters Voltage measurement Control systems Voltage control

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