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Mechanism underlying constant amplitude oscillation of grid-tied voltage source converters

Mechanism underlying constant amplitude oscillation of grid-...

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8th Renewable Power Generation Conference (RPG 2019)

作者： Jianhang Zhu Shicong Ma Xuan Gong Jiabing Hu School of Electrical and Electronic Engineering and State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Power System Department China Electric Power Research Institute Beijing 100192 China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Small-signal stability is one of the main issues for the safe operation of power system. The traditional studies mainly focus on stability determination of power system, but the issue after system oscillation divergence is seldom involved, which may cause system collapse and trigger protective actions, or oscillate at a constant amplitude with a certain frequency. In this paper, the mechanism of small-signal instability diverging to constant amplitude oscillation (CAO) is studied for grid connected converters, which only considers the nonlinear factors introduced by phase-locked loop (PLL) controller. Based on the nonlinear analysis method of Lyapunov exponent, the CAO is caused by the nonlinear limit cycles, which is investigated for the first time, and the period of nonlinear limit cycle dose not correspond to the unstable modal frequency of small-signal analysis. When the system oscillates stably with constant amplitude, the system model cannot be described by linear-time invariable (LTI) model in constant speed reference frame of base frequency, then the linear-time periodic (LTP) theory is introduced into this case. Based on the Floquet theory, the eigenvalue locus of LTP model in time-domain illustrates the process of unstable system at constant steady-state operating point diverging to a stable system at steady-state trajectory. Finally, the validity of the analysis is verified by simulation.

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Speed Control of Linear Induction Motor based on Finite-Set Model Predictive Direct Flux Control

Speed Control of Linear Induction Motor based on Finite-Set ...

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Workshop on Predictive Control of Electrical Drives and Power Electronics (PRECEDE)

作者： Mahmoud F. Elmorshedy Wei Xu Yi Liu Said M. Allam Minghai Dong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta University Tanta Egypt Foshan Golden Age Motor technology Co. Ltd Foshan China

This paper proposes a speed control of linear induction motor (LIM) based on a finite-set model predictive flux control (FS-MPFC). The end effect is taken into consideration for both modeling of LIM and for the proposed control method. The proposed control method is used to achieve lower thrust ripple, reduce the calculation process and eliminating the weighting factor from the cost function. The cost function is based only on the primary flux linkage error in αβ-coordinates. The primary flux linkage error is calculated from the difference between the reference primary flux linkage and the predicted primary flux linkage. A comparison between the proposed method and the finite set model predictive direct thrust control (FS-MPDTC) is presented to illustrate the simplicity of the proposed method. The performance of the proposed control strategy is verified by simulation results where the parameters of a 3kW platform arc induction machine is used.

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Active Current-Limiting Control to Handle DC Line Fault of Overhead DC Grid

Active Current-Limiting Control to Handle DC Line Fault of O...

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International Conference on Power Electronics (ICPE)

作者： Meng Zhou Wang Xiang Wenping Zuo Weixing Lin Jinyu Wen Ruizhang Yang Binye Ni Xiaojun Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) Wuhan Hubei Province China TBEA China Xinjiang Sunoasis Co. Ltd Urumqi Xinjiang Province China

ISBN: (纸本)9781728116129

To handle with the DC line faults in a DC grid, this paper proposed an active current-limiting controller for hybrid MMC. With this active current-limiting control strategy, the requirement of interruption current of DCCB will be significantly decreased, and the investment of DC grid will be reduced obviously. Firstly, the control architecture of active current-limiting controller is disclosed. To avoid the overvoltage of submodule capacitors during DC fault, a dynamic limiter for the reference value of the DC current controller is proposed. To decrease the peak of fault current, the feedforward controller of DC voltage is put forward. The decoupling controllability of the AC/DC voltage of hybrid MMC is disclosed. The current-limiting mechanism of the active current-limiting controller is analysis. Then, the validity of the active current-limiting control strategy is verified by RTDS.

关键词： Circuit faults Bridge circuits Voltage control Capacitors Fault currents Limiting Current control

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Fault Diagnosis of Distribution Network Considering Multiple Source Information

Fault Diagnosis of Distribution Network Considering Multiple...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Lang Jiang Li Yu Wei Chen Huiqi Lu Hao Bai Quan Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Power Research Institute China Southern Power Grid Co. Ltd Guangzhou China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

The deep integration of living production, intelligent public service and electric power in today's society makes higher demands on the safety and reliability of the distribution network. This paper presents a fault diagnosis method for distribution network considering multiple information sources. It can take advantages of timing information and logic characteristics at the time of failure. Also, it can better reflect the intrinsic relationship between the information of the measuring device, the protection and the circuit breaker. Finally, it comprehensively utilizes information measuring protective relay, circuit breaker, Feeder Terminal Units (FTU) and other available sources. The chained logic makes use of these information as a result and the status of the primary equipment in the fault circumstance as the cause. Then, the maximum likelihood function is employed to determine the best inference chain, and the accurate diagnosis result is obtained. The feasibility of the proposed method is verified by information collected from industry filed.

关键词： Circuit faults Cognition Circuit breakers Fault diagnosis Power grids Protective relaying

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The Steady-State and Fault Ride-Through Control Strategies of Soft Normally Open Point in Distribution Network 10

The Steady-State and Fault Ride-Through Control Strategies o...

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10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018

作者： Li, Yuze Pei, Xuejun Chen, Zhi Yang, Min Lyu, Zhibi Wang, Chaoliang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Zhejiang Electric Power Research Institute Hangzhou310014 China

ISBN: (纸本)9781479973118

Soft normally open point (SNOP) is a power electronic device installed at normally open point (NOP) in a distribution network which can greatly promote the flexibility and controllability of distribution network. This paper firstly introduces the typical installation of SNOP, and takes the back to back MMC SNOP system as the studied case. Then the PQ-VdcQ strategy is described as steady-state control strategy of SNOP system, and the control principle of power flow on feeder is briefly illustrated. Lastly, the strategies of unbalanced current compensation and active power oscillating suppression are described for fault ride-through strategy. To avoid overcurrent, the unbalanced current compensation strategy is adopted. Simulation results verify the accuracy and effectiveness of the strategies adopted. © 2018 IEEE.

关键词： Electric load flow

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Transient energy analysis and dissipation of a bipolar MTDC wind power integrating system during MMC outage

Transient energy analysis and dissipation of a bipolar MTDC ...

引用

8th Renewable Power Generation Conference (RPG 2019)

作者： Shuai Cao Wang Xiang Xiaojun Lu Weixing Ling Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering (Huazhong University of Science and Technology) Wuhan 430074 Hubei Province China TBEA SunOasis Co. Ltd Urumchi 830011 Xinjiang Province China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Using high-voltage direct current grid (HVDC grid) to integrate wind power is an effective solution to improve the flexibility and reliability of power transmission. Since the DC grid requires fault ride-through capability, hybrid modular multilevel converter (hybrid MMC) is adopted to form the bipolar DC grid. The MMC non-blocking operation strategy of unipolar converter outage is proposed. During the fault, the AC voltage at the integration point is stable, and the wind turbine can maintain its normal operation. To satisfy various dissipation requirements of the surplus wind power during the fault period, an adaptive control strategy of dissipation resistors is designed. Finally, the simulation based on PSCAD/EMTDC platform verifies the MMC unblocking fault ride-through operation of hybrid MTDC grid and proves the effectiveness of its fault energy dissipation.

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Analysis and Control of Isolated Modular Multilevel DC-DC Converter Under Asymmetric Arm Parameter Conditions

Analysis and Control of Isolated Modular Multilevel DC-DC Co...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Zhenyu Qi Xianggen Yin Jinmu Lai Zhen Wang Xin Yin Xinyu Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China University of Liverpool Liverpool United Kingdom Guangzhou Zhiguang Electric Co. Ltd. Guangzhou China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

As a key device of the energy Internet, the power router can realize efficient allocation and management of electric energy. The DC transformer is an important part of the power router and is the core equipment for energy control. In this paper, the operating status and balance control of the isolated modular multilevel dc-dc converter (IMMDCC) in the case of asymmetric bridge arm inductance are studied. Firstly, the working principle of IMMDCC and the model of transmission power are analyzed. The common mode current loop and differential mode current loop of the IMMDCC are established by analyzing the arm current. On this basis, the working principle of IMMDCC and the imbalance of capacitor voltage caused by the asymmetry of arm inductance are analyzed. A control method for changing the duty ratio is proposed to solve the problem of capacitor voltage imbalance.

关键词： Capacitors Inductance Voltage control Modulation Bridge circuits Analytical models

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A comprehensive decision-making method for coordinated transmission and distribution network planning

A comprehensive decision-making method for coordinated trans...

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8th Renewable Power Generation Conference (RPG 2019)

作者： Qianwei Zheng Ju Liu Dongjun Yang Xizhen Xue Jiakun Fang Wei Yao Xiaomeng Ai State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) Wuhan 430074 Hubei Province China State grid Hubei economic research institute Wuhan 430074 Hubei Province China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

The expansion planning of transmission and distribution networks is usually investigated separately in both research and practical programs. However, the split planning method results in redundant expansion investment since the coordination between the power systems of adjacent voltage levels is neglected. In this paper, a co-planning model is proposed, where lines and substations in multiple-level power grid are allocated as a whole rather than in a sequential manner. In addition, an evaluation system is established to comprehensively assess the planning schemes. The coefficients of normalized and weighted indices are determined by entropy weight method. The particle swarm optimization (PSO) algorithm is utilized to solve this nonlinear programming problem. Compared with the complicated mathematical optimization, PSO algorithm is more straightforward and simpler. The simulation of a 13-bus system is taken to verify the effectiveness of the proposed model and algorithm. The results indicate that the planning scheme designed in a coordinated way is more economical and coordinated compared to that in a separate way. The proposed model and algorithm can enlighten the electricity practitioners to improve the current planning pattern for multi-level power system.

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A Novel Fault Location Method for Generator Stator Grounding Considering Armature Reaction

A Novel Fault Location Method for Generator Stator Grounding...

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作者： Hangjie HAN Jun GAO Huimian ZHAO Xianggen YIN Biao XU Zhejiang Zheneng Zhenhai Electric Power Generation Co.LTD Zhejiang Energy Research Institute Co.LTD State Key Laboratory of Advanced Electromagnetic Engineering and Technology(HUST)

Stator grounding fault is very common to the large generator,and the accurate fault location can greatly reduce the time of corrective ***,this problem can be very hard since the structure of the winding is very *** this paper,a fault location method for large generator stator grounding considering armature reaction is ***,the fundamental potential distribution of the stator winding and the influence of armature reaction on the measured voltage are analyzed,and the mathematical relationship among fault position,fundamental potential,fundamental voltage and grounding resistance is then *** this basis,the process of the fault location can be ***,the accuracy and efficiency of the proposed method are verified by extensive experiments performed on PSCAD/EMTDC.

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Press-Pack and Soldered Packaging IGBT Modules for Pulsed Power Applications 2

Press-Pack and Soldered Packaging IGBT Modules for Pulsed Po...

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2nd IEEE International Electrical and Energy Conference, CIEEC 2018

作者： Han, Lubin Liang, Lin Wang, Rui Chen, Cai Zhao, Zihao Tan, Guoqiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781538653913

Aiming at researching into the low-inductance and good heat dissipation capability of rigid Press-Pack IGBT (PPI), the commercial soldered IGBT module is compared with it in terms of the di/dt and Tj in pulse power applications in this paper. The results of the extracted parasitic inductance by the FEM tool show that the parasitic inductance of the Press-Pack IGBT is only 7% of the soldered IGBT module with the same voltage and current rate. The simulated and experimental results show that the discharge current of Press-Pack IGBT module has greater di/dt and a narrower pulse width than the soldered one. The thermoelectric coupling simulations of Press-Pack and soldered IGBT modules show that at repetitive frequency mode, the junction temperature rise of the Press-Pack IGBT is about 50% lower than that of the soldered IGBT. In the thermal steady state experiment, the steady-state junction temperature of the Press-Pack IGBT, even with a higher power, is lower than that of the soldered IGBT module. Therefore, the Press-Pack IGBT module shows better heat dissipation capability and is more suitable for repetitive pulsed power applications. © 2018 IEEE.

关键词： Junction temperature

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