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Load balancing optimization of parallel monte-carlo probabilistic load flow calculation based on openmp

Load balancing optimization of parallel monte-carlo probabil...

引用

International Conference on Power and Energy, CPE 2014

作者： Lu, F. Li, Y.Z. Lu, S.L. Zhang, B.H. Dai, X.K. Wu, J.L. State Grid Jibei Electric Power Company Limited Beijing China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781138027824

The algorithm of probabilistic load flow simulated by serial Monte-Carlo is more timeconsuming due to the more simulation times. It’s difficult to meet the demand for rapid analysis and calculation of large-scale power grid. So it needs to change the serial algorithm into a parallel algorithm in order to shorten the time. But there is the problem of load unbalance with parallel algorithm. This paper first introduces that the probabilistic load flow simulated by Monte-Carlo is more time-consuming. Then based on the OpenMP parallel programming model (Open Multi-Processing, shared memory multithreaded compiler directive), the probabilistic load flow simulated by Monte-Carlo is coarse-grained parallel processing. To deal with the problem of load imbalance in parallel process, we need to optimize the OpenMP parallel programming model through the OpenMP instruction scheduling. With the IEEE162 standard bus system as an example, we simulated the probabilistic load flow based on serial Monte-Carlo for thirty thousand times. The results show that the Load balancing calculated by coarse-grained parallel probabilistic load flow was better, which used OpenMP dynamic scheduling strategy, and we received considerable speedup and parallel efficiency. © 2015 Taylor and Francis Group.

关键词： Parallel algorithms

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A power response characteristics equivalent model for the hybrid energy storage system

A power response characteristics equivalent model for the hy...

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International Conference on Mechatronics engineering and Electrical engineering, CMEEE 2014

作者： Chen, P. Xiao, F. Wang, X.W. Yang, H. Yang, Z.L. Wang, L.J. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Hubei Electric Power Company Wuhan China

ISBN: (纸本)9781138027190

Aiming at the different power response characteristics between the battery and supercapacitor for the hybrid energy storage system in the distributed generation system, this paper puts forward a power response characteristics equivalent model for the hybrid energy storage system. In the model, the transfer function is used to describe the power response characteristics for the battery, supercapacitor and power converter system. Then, control strategies of the hybrid energy storage system are used to analysis the model in simulation. The results show that the equivalent model can accurately reflect the power response characteristics of the hybrid energy storage system. © 2015 Taylor & Francis Group, London.

关键词： Supercapacitor

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The research for power allocation strategy of the hybrid energy storage units in distributed generation system

The research for power allocation strategy of the hybrid ene...

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International Conference on Mechatronics engineering and Electrical engineering, CMEEE 2014

作者： Yang, Z.L. Chen, P. Wang, L.J. Wang, Y.H. Xiao, F. Wang, X.W. Yang, H. State Grid Hubei Electric Power Company Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781138027190

Aiming at the hybrid energy storage units with AC bus lines in distributed generation system, this paper puts forward a power allocation strategy for the hybrid energy storage units. The method retarded the over-charge/over-discharge phenomena of the energy storage units by adjusting the SOC values of the energy storage units in a certain range, through the power command of low-pass filter’s effective distribution between the battery and super-capacitor, according to the SOC value of the battery and super-capacitor. At the same time, it took the state of charge/discharge into account, adjust the filter time constant to ensure that the SOC value of the energy storage units is maintained in a certain range. In PSCAD, the simulation results prove the effectiveness of power allocation strategy in hybrid energy storage units. © 2015 Taylor & Francis Group, London.

关键词： Bandpass filters

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Design of High Power IGBT Interlocking Drive and Protect Circuit Supplied by Single Power Based on ACPL-332J

Design of High Power IGBT Interlocking Drive and Protect Cir...

引用

International Conference on Electrical Machines and Systems

作者： Yuan Zhu Kai Yang Dezhang Lou Tianbao Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 R.P China

ISBN: (纸本)9781467388634

This paper proposes a novel design of high power IGBT interlocking drive and protect circuit supplied by single power based on ACPL-332J chip. Firstly, it introduces the basic principle of interlocking drive circuit. Then, peripheral protect circuit is presented in detail, including chip protect circuit and IGBT protect circuit. Why and how to choose parameters of each component also are described. A novel interlocking drive circuit, without adding any components, is designed to prevent short circuit of DC bus when gate drive signals of the upper and lower IGBTs in the same phase are turned on at the same time. This IGBT interlocking drive and protect circuit is proved to be stable and reliable in Servo drive system of PMSM by experiment.

关键词： permanent magnetic synchronous motor (PMSM) interlocking drive IGBT single power supply ACPL-332J over current protect circuit of IGBT

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Unit commitment considering coordinated dispatch of large scale electric vehicles and wind power generation

Unit commitment considering coordinated dispatch of large sc...

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International Conference on Renewable Power Generation, RPG 2015

作者： Wang, Chun Wu, Ke Zhang, Xiangwen Sun, Haishun Zhang, Cong Xv, Xiaohui China Electric Power Research Institute Beijing100192 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781785610400

Assuming that all electric vehicles (EVs) integrated to the grid are managed by aggregators, it is possible to make full use of the controllability of the charging EVs. Based on this. the charging load of each EV aggregator is defined as one of the optimal scheduling variables in the unit commitment (UC) model. This can be accomplished by assessing the upper and lower limit of charging load of each EV aggregator in different scenarios, which is simulated by Monte Carlo method. According to this, a UC model is proposed for optimal coordination of EV aggregators and wind generation, considering the EV owner's requirement, the range of charging load and the unit constraints. Using the10-units system as the test system, the results of UC models with different EVs charging strategies and the wind power integration indicators such as utilization rate are investigated. Simulation results show that both the abandoned wind power and the unit operating costs can be decreased more effectively in the proposed UC model.

关键词： Electric vehicles

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Research on frequency regulation using scheduling capacity of electric vehicles

Research on frequency regulation using scheduling capacity o...

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International Conference on Renewable Power Generation, RPG 2015

作者： He, Chenying Zhang, Xiangwen Sun, Haishun Xu, Xiaohui Liu, Haixuan Zhang, Cong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781785610400

Nowadays, growing number of electric vehicles (EVs) can not only be controllable load to regulate power system, but also serve as distributed energy storage unit that can feedback to the grid by vehicle-to-grid (V2G). Therefore, ancillary services for the grid such as frequency regulation can potentially be provided by the use of EVs with scheduling capacity. However, the scheduling capacity is limited by factors such as the constraints of customers travel demand and the battery life. Based on this, a centralized control mode is applied for distributed EVs and a mathematical model with charging and discharging static frequency characteristics of aggregators is established, considering EVs scheduling capacity. According to this, load frequency control models both for single and two-area power systems are proposed. The simulation results show that using EVs scheduling capacity for frequency regulation can effectively help reducing the system frequency deviation and thus improving the electricity quality. Furthermore, the reserve capacity of traditional frequency regulation units can be decreased and especially power system economics has developed.

关键词： Electric power system control

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Active Damping of Output LCL Filter in PWM Inverter-Fed Drive System With Long Motor Cable

Active Damping of Output LCL Filter in PWM Inverter-Fed Driv...

引用

International Conference on Electrical Machines and Systems

作者： Guangqiang Kan Shenghua Huang Xunhao Zou State Key Laboratory Ratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 R.P. China

ISBN: (纸本)9781467388634

In the PWM inverter-fed drive systems, overvoltage easily occur at the terminal of motor because of the high change rate of the inverter output voltage. Especially, when there is a long motor cable between the inverter and motor in some application, voltage reflection makes such phenomenon much more obvious. Overvoltage will lead to the failure of the motor and cable insulation. The LCL filter is often used to make the voltage sinusoidal, suppressing overvoltage. However, the LCL filter may causes the oscillation or resonance at system resonant frequency. One of the methods to solve the problem is passive damping. Although passive damping is simple and reliable, it will result in the loss of power. In this paper, a feasible and simple active damping algorithm for permanent magnet synchronous motor (PMSM) vector control system with LCL filter is proposed. The high-frequency component of the inverter side inductor current is multiplied by the virtual resistance to simulate the resistance drop. Meanwhile, the fundamental component of the inductor current inverter side can be used in the motor control. Compared with the traditional active damping, the proposed algorithms can save a set of sensors. The proposed algorithm is irrelevant to the design of standard vector control. Simulation results show that the proposed algorithm is feasible.

关键词： Active damping (AD) LCL filter long motor cable vector control

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DFIG WT electromechanical transient behaviour influenced by PLL: Modelling and analysis

DFIG WT electromechanical transient behaviour influenced by ...

引用

International Conference on Renewable Power Generation, RPG 2015

作者： Wang, Yajing Hu, Jiabing Zhang, Dongliang Ye, Chao Li, Qing State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Eelectronic Engineering Huazhong University of Science and Technology Wuhan430074 China China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781785610400

With increasing wind power penetrations, WTGs shoulder a higher responsibility. Traditional WTG control and modelling is generally designed assuming that the external grid is strong enough. However, in the case of weak grid in which power variations between synchronous generators (SG) and DFIG are more intense, more appropriate DFIG model needs to be built for electromechanical transient stability analysis of power system. Phase-locked loop (PLL) is typically employed in modern megawatt WTGs and tracks the WT's terminal voltage phase change, so as to provide reference frame for active/reactive power control. Thus power output of DFIG as well as other power source in the system subjects to PLL's dynamic responses. This work establishes a DFIG-based WT's electromechanical transient model considering the dynamic influence of PLL, and analyses its dynamic response which influences WTG electromechanical transient behaviour and system stability.

关键词： Phase locked loops

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Comparison of Two Rotor Topologies for High-Speed Permanent Magnet Synchronous Machines

Comparison of Two Rotor Topologies for High-Speed Permanent ...

引用

International Conference on Electrical Machines

作者： Yan Xia Jian Li Ronghai Qu Haiyang Fang State Key State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

ISBN: (纸本)9781509025398

This paper aims to compare ring permanent magnet rotor and solid cylinder permanent magnet rotor for high-speed permanent magnet synchronous machine. Due to the difference between structures, sleeves of two kinds of rotors are made of different materials. Thus, assembling methods of sleeves and their thicknesses vary. Moreover, electromagnetic properties are also influenced. Then measures are taken to suppress rotor eddy current loss according to rotor mechanical structure. And thermal analysis is performed on different motors with cooling condition kept the same. Finally, demagnetization phenomenon is studied. In this paper, all comparisons are based on design procedure of a two-pole 40,000 rpm prototype machine. All these issues are discussed from economical, mechanical, electromagnetic, and thermal perspective in order to find an optimal solution. It is suggested that ring PM rotor is a better choice in this work under design.

关键词： Eddy current loss electromagnetic High speed permanent magnet synchronous machine Mechanical Rotor topology Retaining sleeve Thermal

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Split Ratio Optimization of High-Speed Permanent Magnet Synchronous Machines Based on Thermal Resistance Network

Split Ratio Optimization of High-Speed Permanent Magnet Sync...

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International Conference on Electrical Machines

作者： Xinggang Fan Ronghai Qu Bin Zhang Jian Li Dawei Li State Key State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

ISBN: (纸本)9781509025398

The split ratio is a significant parameter which affects the torque output and efficiency of permanent magnet machines. It has been optimized for obtaining the maximum torque output with a fixed maximum allowable copper loss or current density as the thermal constraints in the current findings. However, these indirect thermal constraints could be influenced by the split ratio due to the changing machine dimensions and may fail to limit the winding temperature rise. To solve this matter, an analytical split ratio optimization method is proposed in this paper based on the thermal resistance network (TRN). It takes the winding temperature rise limitation as the thermal constraint directly. Both the influence of the core loss and air-friction loss on the optimal split ratio is considered in the analytical optimization method. The proposed analytical method is validated by the electromagnetic and thermal finite element analysis (FEA).

关键词： Air-friction loss High-speed Optimal split ratio Permanent magnet synchronous machine (PMSM) Thermal constraint Thermal resistance network (TRN) Torque density

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