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A systematic and qualitative assessment method and software design for energy efficiency of typical electric machine systems with pumps and fans

A systematic and qualitative assessment method and software ...

引用

11th International Conference on Electrical Machines and systems, ICEMS 2008

作者： Yi, Lei Zhengming, Zhao Jing, Xue State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9787506292214

Three-phase induction motors as well as power converters are intrinsically efficient machines and devices. However, due to the common misapplication of them with loads like pumps and fans, these electric machine systems are considered a great potential of energy conservation in industries. As to assessing methods of energy conservation, neither the study of induction machine efficiency nor the analysis of pumps and fans performance is new. However, the systematic and qualitative analysis and assessment of the energy efficiency of induction machines, loads and control devices acting as a whole system are still complicated yet indispensable for electric machine system energy conservation program in China. In this paper, a systematic and qualitative assessment method for energy application efficiency of electric machine system is raised. Based on this method, an assessing computer program is designed to provide referencing information for making investment decisions regarding energy efficiency measures at manufacturing plants. An expert system is also designed to choose equipments that match each other.

关键词： Investments

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Effect of gamma-ray irradiation on characteristics of surface charging of polyethylene

Effect of gamma-ray irradiation on characteristics of surfac...

引用

2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Zhu, Xiaohui Gao, Yu Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

Polyethylene (PE) was employed as test sample which was previously irradiated in air up to 100 kGy and then up to 1000 kGy with dose rate of 10 kGy / h by using a 60Co gamma-source. The sample surface was corona charged by applying a series of dc stresses on needle electrode which was set 6 mm above the surface. An electrostatic probe was designed to measure the surface charge density immediately after the charging process. Obtained results show dependence of total surface charge upon the applied voltage and the radiation dose. It is suggested that surface charge accumulation depends upon the density of localized surface states, which is alternated by radiation-induced degradation and cross-linking reactions of molecule structure.

关键词： Surface charge

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Dynamic observation on surface charge migration of polybutylene terephthalate under DC voltage

Dynamic observation on surface charge migration of polybutyl...

引用

2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Gao, Yu Zhang, Lei Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

Polybutylene terephthalate(PBT) was employed as test sample to investigate the characteristics of surface charge migration. The experiment was carried out on sample surface under a negative dc stress between two parallel electrodes. An electrostatic probe was designed to measure the surface charge density with minimum charge resolution of 0.018 pC. Obtained results show that negative charges appear near high voltage electrode, while positive charges emerge in front of grounded electrode. The hetero charges migrate towards the opposite electrode with time, forming a junction line near the grounded electrode. The polarity of surface charge tends to be positive dominated with the lapse of decay time. It is suggested that the local field at HV electrode will be seriously enhanced ifthe source is turned on again.

关键词： Electrodes

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Luminescence in tracking test of polymer insulating materials

Luminescence in tracking test of polymer insulating material...

引用

2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Gu, L. Liu, Yong Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University 92 Weijin Road Tianjin 300072 China

This paper presents a study on effects of flammation retardant in polycarbonate (PC) on the luminescence phenomena during the tracking tests. A photo multiplier tube was employed to measure the light intensity, which is found to be well in accordance with the development of tracking failure. The results obtained reveals that light is easily emitted when the phase angle of applied voltage is around 90 and 270. Weak initial light indicates the coming scintillation discharge;the continuously enhanced light is associated the scintillation discharge and the arc discharge. Each light pulse is composed of a main pulse and scores of small pulses. With the increasing flame retardant in PC, the luminescence intensity significantly decreases. The detecting technique of luminescence is sensitive to measure the light information from faint discharge pulses during the tracking tests.

关键词： Light

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New line-selection method for single phase grounding fault in distribution networks with two phase's current transformers

New line-selection method for single phase grounding fault i...

引用

3rd International Conference on Deregulation and Restructuring and Power Technologies, DRPT 2008

作者： Zhang, Yanxia Jin, Zhiqiang Dai, Fengxian Fang, Ting Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin 300072 China College of Electrical Engineering Tianjin University Tianjin 300072 China

ISBN: (纸本)9787900714138

In China, current transformers (TAs) are just installed at A-phase and C-phase in most distribution networks with neutral indirectly grounding. It is a very difficult problem to select single-phase grounding line using the currents of A phase and B phase. After analyzing the currents of A-phase and C-phase when B-phase grounding fault occurs, the fault line detection algorithm applying the transient characters of the sum of A-phase mutational current and C-phase mutational current is proposed. For A-phase to ground fault or C-phase to ground fault, the algorithm of constructing B-phase transient current and furthermore constructing the exact zero-sequence current is founded out through the analysis in frequency domain and time domain, and the fault line-detection method can be actualized according to zero-sequence current's transient characters. Based on them, a new method used to identify single phase to ground fault line using transient characteristics in two TAs distribution networks is formed. The proposed line-selection method is not affected by the mode whether the Petersen coil exists at neutral and the unbalanced current under normal operation condition. © 2008 DRPT.

关键词： Power quality

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Dynamical characteristic of MicroGrid with peer to peer control

Dynamical characteristic of MicroGrid with peer to peer cont...

引用

2008 China International Conference on Electricity Distribution, CICED 2008

作者： Guo, Li Wang, Chengshan Guo, Lingxu Cao, Jing Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin 300072 China Tianjin Electric Power Co. Tianjin 300010 China

ISBN: (纸本)9781424433735

Based on constructing different types of distributed generations and energy storage equipments, this paper simulated the dynamical characteristics of MicroGrid with several operating modes under peer to peer control strategy. Two cases were used to analyze the role of storage equipment in MicroGrid. If micro turbine generation with traditional synchronization generator was used in MicroGrid as the main power adjustment unit, the frequency and voltage of MicroGrid would fluctuate during MicroGrid changed from grid-connected mode to islanded mode. In case 2, where the battery was installed in MicroGrid, the oscillation of frequency and voltage could be damped efficiently, and the operating mode switch time was shorten.

关键词： Distributed power generation

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The negative-sequence distance protection for UHV long distance transmission line

The negative-sequence distance protection for UHV long dista...

引用

IET 9th International Conference on Developments in Power systems Protection, DPSP 2008

作者： Li, Bin Ma, Chao He, Jiali Bo, Zhiqian Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin 300072 China AREVA T and D Automation and Information Stafford United Kingdom

ISBN: (纸本)9780863419027

UHV transmission can transmit huge capacity energy over long distance. The paper proposes a new negative-sequence distance protection based on Bergeron model. Since Bergeron model has taken distribution parameters into account, the proposed principle is valid for providing protection in the case of remote or close faults, and it has high sensitivity for fault with fault-path resistance. Furthermore, this protection will not be influenced by load current, system oscillation, etc. The superior performance of the protection shows that it is especially competent to be the backup protection of UHV long distance transmission lines.

关键词： Electric lines

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A Novel Direct Power control Strategy for Three-Level PWM Rectifier Based on Fized Synthesizing Vectors

A Novel Direct Power Control Strategy for Three-Level PWM Re...

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11th International Conference on Electrical Machines and systems(第11届国际电机与系统会议)

作者： Ting Lu Yongchang Zhang Yingchao Zhang Zhengming Zhao Liqiang Yuan State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department o State Key Laboratory of Control and Simulation of Power System and Generation EquipmentDepartment of

A novel direct power control (DPC) strategy for three-level neutral-point-clamped (NPC) pulse-width-modulation (PWM) rectifier, based on fixed synthesizing vectors, is proposed in this paper. The strategy breaks through the restrictions of vector switching with a simple switching table, improves the excellent dynamic performance of DPC, avoids the neutral-point voltage unbalance and the excessive voltage jumps in phase and line-to-line voltages of the rectifier, and guarantees the proper minimum pulse width and switching intervals between switches in different phases simultaneously. Experimental results verify the validity and feasibility of the proposed scheme.

关键词： Pulse width modulation Power control Rectifiers Space vector pulse width modulation Switches Thyristors Topology Voltage control Snubbers control system synthesis

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DC/DC Converter Applied in the Photovoltaic- Inclined Thermal Collector Hybrid systems for Brackish Water Desalination

DC/DC Converter Applied in the Photovoltaic- Inclined Therma...

引用

11th International Conference on Electrical Machines and systems(第11届国际电机与系统会议)

作者： Liqiang Yuan Mohamed Eltawil Zhengming Zhao Yaodong Lu State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department o State Key Laboratory of Control and Simulation of Power System and Generation EquipmentDepartment of

A chronic drinking water shortage is one of the most important issues in the developing countries, and drinking water from dirty water sources causes serious damage to inhabitants health in some remote areas. The solar distillation remains the most favorable process for the supplying of water to small communities. Base on the traditional solar still, an improved hybrid photovoltaic/thermal (PVT) desalination system is presented. The PV modules that are combined with thermal units, constitute the PVT systems which has longer operating time and higher average fresh water production. This paper introduces the DC/DC converter applied in this type of systems, including its structure and control strategy which is suitable for PV array and driving supportive heater. The experimental results for the converter and the whole system are showed and analyzed.

关键词： DC-DC power converters Photovoltaic systems Solar power generation Desalination Temperature Water resources Hybrid power systems Solar energy Water heating Power system simulation

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The scheme of single-phase adaptive reclosing on EHV/UHV transmission lines

The scheme of single-phase adaptive reclosing on EHV/UHV tra...

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IET 9th International Conference on Developments in Power systems Protection, DPSP 2008

作者： Bin, Li Shuo, Zhang Crossley, P. Bo, Zhiqian Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China Manchester University United Kingdom AREVA T and D Automation and Information Stafford United Kingdom

ISBN: (纸本)9780863419027

Automatic reclosure (AR) is extremely effective in improving the reliability, stability and security of the overall power system. However, the present autoreclosure operates blindly and practices employing a fixed time. In the case of permanent fault, a second shock to the system can cause irreparable damage to expensive equipments. According to characters of transient faults and permanent faults, this paper introduces the method of Bergeron line model into the field of single-phase adaptive reclosing (SPAR). Therefore, the paper proposes a novel scheme based on the calculation of Bergeron model to realize SPAR. Theoretical analysis and simulation prove that the proposed scheme of single-phase adaptive reclosing is valid with high sensitivity and reliability.

关键词： Reliability analysis

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