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2016 IEEE PES Asia Pacific power and Energy Engineering Conference, APPEEC 2016

作者： Kun, Ding Ningbo, Wang Xie, Haipeng Bie, Zhaohong Laboratory of Wind Power Integration Operation and Control Gansu Electric Power Corporation Wind Power Technology Center Lanzhou China State Key Lab. of Elec. Insulation and Pwr. Equip. and Smart Grid Key Laboratory of Shaanxi Province Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781509054183

A short-term stochastic production simulation method considering the forecast error of renewable sources power is proposed to focus on the issue that conventional production simulation method is incapable of depicting the forecast error of renewable sources power. The proposed method contains two hierarchies, i.e. the day-ahead simulation and the real-time simulation. As for day-ahead simulation, a day-ahead scheduling of conventional units and renewable energy plants is determined by solving a unit commitment model on the basis of forecasted renewable sources power and load profiles. Real-time simulation is the supplement to day-ahead simulation and it corrects the results in day-ahead simulation. The validity of the proposed method is proved with a real power grid in Northwest China. Case studies show that conventional units may be still the major resource of power grids although these installed capacity is no larger than renewable energy resources. Meanwhile, forecast errors actually impact reliability of power systems. © 2016 IEEE.

关键词： Renewable energy resources

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A novel multi-microgrids system reliability assessment algorithm using parallel computing

A novel multi-microgrids system reliability assessment algor...

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2017 IEEE Conference on Energy Internet and Energy system Integration, EI2 2017

作者： Su, Xin Cheng, Yan Zhang, Xingyou Wei, Chuanzhi State Grid Jinan Power Supply Company Jinan China State Grid Shandong Electric Power Research Institute Jinan China Key Lab. of Power System Intelligent Dispatch and Control Ministry of Education Shandong University China

ISBN: (纸本)9781538614273

Under the condition of multi-microgrids system, due to the location dispersion of microgrids, and the different characteristics of distributed generations and loads, the size of sampling in a reliability assessment algorithm is always huge, which influences computational efficiency. In this paper, based on the operation characteristics of a multi-microgrid system, a reliability evaluation algorithm based on the parallel computing algorithm of the multi-microgrid system is proposed. The algorithm can sample the operating state of each microgrid at the same time and consider the interaction between the various microgrids in a multi-microgrids system. The algorithm can significantly improve the calculation speed of the reliability assessment algorithm of the multi-microgrid system, which is of great significance to the reliability evaluation of the multi-microgrid system in the region. © 2017 IEEE.

关键词： Reliability analysis

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A Novel High Step-Down DC-DC Converter Based On Symmetric PWM Half Bridge Converter

A Novel High Step-Down DC-DC Converter Based On Symmetric PW...

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Energy Engineering and power systems (EEPS), International Conference on

作者： Zhaolin Hao Runquan Meng Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (数字)9798350375138

ISBN: (纸本)9798350375145

This paper proposes a new ISOP (Input Series Output Quasi Parallel) resonant converter composed of LLC resonant converter and symmetrical half bridge PWM converter to address the limitations of the Buck converter in high conversion ratio conditions and its limited duty cycle adjustment, which is not suitable for situations such as data centers with electrical isolation and high safety performance requirements. It provides a new choice for different application scenarios and has certain advantages in low-voltage and high current output situations. The circuit structure of the converter is introduced, and its working principle and characteristics are analyzed. The correctness of the topology structure is verified through simulation on Simulink.

关键词： Pulse width modulation converters Software packages Simulation Bridge circuits Resonant converters Pulse width modulation Topology Safety Voltage control Switching circuits

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Study of improved active-clamped phase shift full bridge converter

Study of improved active-clamped phase shift full bridge con...

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Electrical Engineering and control Science (IC2ECS), International Conference on

作者： Xin He Runquan Meng Ruishu Li Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China

Aiming at the drawbacks of the conventional phase-shifted full-bridge topology in terms of high voltage stress in the synchronous rectifier switches and high switching loss of the primary-side switch under low load conditions, a phase-shifted full-bridge circuit with improved control of an active clamp circuit is proposed. The converter utilizes the resonance of the switch parasitic capacitance with the primary-side resonant inductor to achieve ZVS (Zero- Voltage-Switch) under light load, and effectively improves the efficiency under heavy load by zeroing the primary-side current in the circulating current stage. In this paper, the topology, operating principle and operating characteristics of the proposed scheme are described in detail, and the feasibility of the scheme is verified by simulation in PLECS platform.

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A Three-Loop control Mehod for DC Solid State Transformer

A Three-Loop Control Mehod for DC Solid State Transformer

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International Conference on power Electronics and Drive systems (PEDS)

作者： Shengwen Li Xiangqi Meng Xiaoqing Han Peng Wang Yanbing Jia Chunguang Ren Shanxi Electric Power Research Institute Taiyuan China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

Aiming at the poor dynamic performance of DC solid transformer with dual-loop control, a three-loop control method is proposed for the DC transformer to improve the system dynamic performance. The proposed control method is implemented by introducing an output current loop to the traditional dual-loop control system. Simulation results show the effective of the proposed method.

关键词： Voltage control control systems power system dynamics Solids Mathematical model Impedance

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Group equivalent modeling and analysis of group subsynchronous oscillation of direct-drive wind turbine 5

Group equivalent modeling and analysis of group subsynchrono...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Dong, Xuetao Zhao, Yue Zhai, Wenchao Wang, Zhenyang Liu, Kan Yan, Gangui Electric Power Research Institute of State Grid Xinjiang Electric Power Co. Ltd. Dept. Xinjiang Electric Power System Whole Process Simulation Key Laboratory Urumqi China Northeast Electric Power University Dept. Min. of Educ. Key Lab. of Modern Power System Simulation Control and Green Power Technology Jilin China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Taking the direct drive wind farm connected to weak AC system as the research object, combined with the actual topology of a wind farm in Hami, Xinjiang, this paper establishes the detailed model and cluster aggregation model of direct drive wind farm on PSCAD / EMTDC platform, and comprehensively analyzes the effectiveness of aggregation model under sub synchronous oscillation (SSO). The results show that when SSO occurs, the cluster equivalent model can accurately reflect the output characteristics, damping characteristics and oscillation frequency of the wind farm. According to the actual topology of a wind power collection station in Hami, Xinjiang and the actual operation of a wind power collection station on a certain day, the equivalent clustering is carried out. © 2022 IEEE.

关键词： Wind power

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Optimized design of multivariable PID controllers for steam turbine generator sets

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Dongli Gongcheng/power Engineering 2005年第5期25卷 668-672+741页

作者： Xue, Ya-Li Li, Dong-Hai Lu, Chong-De Key Simulation Lab. for Power System and Generation Control Department of Thermal Engineering Tsinghua University Beijing 100084 China

A method, based on Genetic Algorithm, for optimizing multivariable PID controllers, is being proposed. The global parameters of the PID controller are optimized here by utilizing the generic framework of genetic algorithm. The only prerequisite asked for by the method is that the object function can be numerically evaluated, without any restrictions concerning the concrete form of the controlled object's model, and without requiring any analytical relationship between the object function and the control parameters as well. The method is therefore featured by superior universality. Simulation of a steam turbine generator set' s control system shows that, though the decoupling effect of multivariable PID controllers, designed by the mentioned method, is somewhat inferior to the optimization of parameterized high order normal matrix design method, but has, in respect to decoupling effect, remarkable improvements in comparison with multi-loop PLD control. It has, in addition, a certain disturbance resistant capability, and robustness;is exhibiting good dynamic behavior and proves the method's feasibility.

关键词： Automatic control Decoupling Genetic algorithm PID controller Steam turbine generator set

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Reliability Assessment of Wind Farm with Wind Turbine Gearbox Fatigue

Reliability Assessment of Wind Farm with Wind Turbine Gearbo...

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

作者： Jiali Wang Xiaoqing Han Tianhao Song Yanbing Jia Shanxi Key Lab.of Power System Operation and Control Taiyuan University of Technology Tauyuan China

ISBN: (纸本)9781665434263

The gearbox of wind turbine has the longest downtime due to mechanical failure, and fatigue is the most important failure form of gearbox. Traditional wind reliability model not considering the influence of gear box of immobilized fatigue, this paper proposes a meter and gearbox fatigue reliability evaluation method of wind farms, this method is intuitive reflect the extent to which each gearbox fatigue damage caused by different failure rate difference, and applicable to other fatigue as the main failure forms of component reliability modeling. The fatigue failure rate model of wind turbine gearbox was established based on the fatigue analysis of wind turbine gearbox, and the fatigue failure state was embedded into the conventional wind turbine Markov model through the failure rate, which was applied to the reliability evaluation of containing wind farm to improve the evaluation accuracy. The results show that ignoring the gearbox fatigue failure will lead to the wind turbine outage risk assessment results are relatively conservative, overestimate the reliability level of wind farm, and the more serious the accumulation of gearbox fatigue damage, the more significant the impact on the system reliability.

关键词： Analytical models Wind farms Wind power generation Markov processes Fatigue power system reliability Wind turbines

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New type of fiber optic sensor network for smart grid interface of transmission system

New type of fiber optic sensor network for smart grid interf...

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作者： Huang, Qi Zhang, Changhua Liu, Qunying Ning, Yan Cao, Yongxing Chengdu Sichuan 610054 China Sichuan Provincial Key Lab. of Power System Wide-area Measurement and Control Sichuan Electric Power Test and Research Institute No. 23 Qinghua Rd. Chengdu 610072 Sichuan China

ISBN: (纸本)9781424483570

Smart Grid is aimed to incorporate monitoring, analysis, control and communication capabilities to improve reliability and energy efficiency. However, currently there is no enough sensor to provide information interface for the implementation of smart grid. Therefore, new types of sensors should be deployed to assist the implementation of smart grid. This paper proposes a novel scheme, in which new type of fiber optic sensors (as compared with traditional Farady effect based fiber optic sensor used in power system instrumentation) are used to provide multiple types of information for smart grid. The new Fiber Gragg Gratting (FBG) is advantageous in that it can collect variant types of information and can form a sensor network. A transmission line monitoring system with distributed fiber optic senor setwork is designed, and the procedures to evaluate the status of the overhead transmission line (such as sag, vibration, and galloping) are proposed. A testing setup is built at lab.ratory, and it is shown that the FBG sensor is capable of obtaining the comprehensive information for evaluating the status of the overhead transmission line. ©2010 IEEE.

关键词： Smart power grids

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Radiation noise simulation and analysis of disc brake 46

Radiation noise simulation and analysis of disc brake

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46th International Congress and Exposition on Noise control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017

作者： Hu, Xiaojun Shang, Ke Liu, Yaoguang Liu, Xiandong School of Transportation Science and Engineering Beihang University China Beijing Key Lab. High. Power Trans. and System Control New Energy Res. Vehicle Beihang University China

Brake noise has always been an important concern of quality problems in the automotive industry. Among all the noises generated by brakes, squeal is the most common anddisturbing one for passengers and the environment. In order to simulatethe brake squeal,a complete finiteelement model of disc brake is established, and the transient dynamic responsesof specifiednodes in the modelare calculated by ABAQUS. Thevibration velocity field of the disc is abstracted from above simulation, and tndelivered to the established vehicle and environment model in acoustic software LMS Virtual lab. Then the simulation of the radiation sound field of brake squeal is carried out by using the indirect boundary element method. And the sound power spectrum of the brake squeal and sound pressure spectrum at specified points are calculated and analyzed. Moreover, for the case of covering the wheel cover with the damping materials, theradiation noise of the disc brake is also calculated, andthe results show that the damping materials are effective in noise reduction. © 2017 Institute of Noise control Engineering. All rights reserved.

关键词： Boundary element method

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