Northeast China Institute of Electrical Power Engineering
Jilin, China

Northeast Dianli University is a university in Jilin, China. It was formed in 1949 in Changchun and was moved to Jilin in 1955. It focuses on engineering and has 14,235 full time students. Wikipedia.

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Cai W.,Northeast China Institute of Electrical Power Engineering
Journal of Computational and Theoretical Nanoscience | Year: 2016

Secondary reheating unit is one of key technologies to improve power generation efficiency and reduce emission. Through analyzing disturbance factor of steam temperature control of secondary reheating unit in the Thesis, the control strategy for main steam and reheating steam temperature of secondary reheating unit is formulated and it is verified through engineering cases that at the time of variable load and steady state of unit, the control deviation of main steam temperature and reheating steam temperature is smaller and the control effect is excellent, laying foundation for energetic promotion of secondary reheating unit. Copyright © 2016 American Scientific Publishers All rights reserved.

Ma Y.,University of Shanghai for Science and Technology | Guo X.,Northeast China Institute of Electrical Power Engineering | Xiao F.,Northeast China Institute of Electrical Power Engineering | Shi D.,Shanghai J.E Power Plant Equipment Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

This paper advanced an efficient lignite-fired power generation technology based on open pulverizing system with flue gas drying fan mill and recovery of heat and water from pulverizing exhaust. In order to demonstrate the security, energy saving and water recovery advantages of this new technology, a detailed comparative calculation and analysis was performed by comparison with an operating 600 MW power generating unit which fired Chinese lignite with total moisture 39.5% and applied traditional direct-fired pulverizing system. The calculation results show that the gross standard coal consumption rate could be reduced about 10 g/(kW(h) by applying this new technology, meanwhile the investment of boiler island could be slightly reduced and the service power remained unchanged on the whole. On the other hand, a mass of water resource could be recovered from lignite by cooling the high moisture pulverizing exhaust, so that it's possible to realize a lignite-fired power plant with zero water consumption if those recovered water was used as make-up water for power plant. Moreover, due to the inert dryer composed of hot and cool flue gas, the long-standing security problem of pulverizing system explosion often occurred in lignite-fired power plants could be avoided by this new technology. Additionally, no extra pollutant emission resulted from this new technology as the foregoing advantages were performed. From the perspective of engineering applications, the technology processes and the relevant facilities of this technology are matured in nowadays coal-fired power plants, and this new technology can be easily assembled with those coal-fired power generation technologies with a view to heighten steam parameters, such as supercritical pressure, ultra-supercritical pressure, double reheat and 700°C thermal power plant, etc. So it's a green and efficient lignite-fired power generation technology to be worthy of further research and application, for the marked environmental and economic benefits of lignite region. © 2013 Chinese Society for Electrical Engineering.

Li Z.,University of Missouri | Yang M.,University of Shanghai for Science and Technology | Yang M.,Northeast China Institute of Electrical Power Engineering | Zhang Y.,University of Missouri
Journal of Thermophysics and Heat Transfer | Year: 2014

A hybrid lattice Boltzmann and finite volume method is proposed for fluid flow and heat transfer simulation. The lattice Boltzmann method was appliedto obtain the velocity field, whereas the finite volume method was usedtoobtain the temperature field. The two-dimensional nine discrete velocities (D2Q9) model and nonequilibrium extrapolation scheme boundary condition were used in the lattice Boltzmann method, and the SIMPLE algorithm with the QUICK scheme was employedinthe finite volume method. Natural convection with different Rayleigh numbers was solved by the hybrid method, and the results agreed very well with those obtained from a pure finite volume method and pure thermal lattice Boltzmann method. This is the first time that the hybrid lattice Boltzmann with the finite volume method has been applied to solve natural convection problem. Copyright © 2013 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Wang H.,Northeast China Institute of Electrical Power Engineering | Yu T.,Northeast China Institute of Electrical Power Engineering | Tang J.,Shaoguan Power Supply Bureau
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

This paper proposed a multi-agent decentralized correlated equilibrium Q(λ) (DCEQ(λ)) learning algorithm to tackle automatic generation control (AGC) under strong random gird environment considering emerging renewable energy sources. This algorithm does not need to consider the tradeoffs between exploitation and exploration, it also does not need any knowledge of the system model and uses the trial and error methods to find the most desired policy. After the adaptive problem of this algorithm in AGC fields had been figured out, an improved reward function and an equilibrium selected function integrated with fair factor were proposed. Three kinds of eligibility traces were also analyzed and SARSA(λ) was introduced in this algorithm to reassign the delayed reward appropriately due to the long time-delay control link such as AGC thermal plants. Simulation tests on a two-area load frequency control (LFC) power system model and China Southern Power Grid demonstrated that DCEQ(λ) controller has better control performance than Q(λ) controller, and can effectively smooth the instantaneous value of automatic generation control (ACE) and control performance standard (CPS), and thus improve the stability and robustness of interconnected power systems. © 2014 Chin. Soc. for Elec. Eng.

Yu T.,Northeast China Institute of Electrical Power Engineering | Wang Y.-M.,Northeast China Institute of Electrical Power Engineering | Liu Q.-J.,Northeast China Institute of Electrical Power Engineering
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

The dynamic optimization of automatic generation control (AGC) order allocation based on the NERC's control performance standard (CPS) is a problem on stochastic optimization in the AGC system for the interconnected power system. The CPS order allocation was discretized and viewed as a discrete time Markov decision process (DTMDP). The dynamic control method based on Q-learning was proposed. Reward functions in Q-learning were designed based on different optimization objectives. Thermal and hydro units were integrated, with the regulating margin for hydro units being considered, toimprove the regulating performance of the AGC system. The application of the Q-learning algorithm in the two-area load frequency control (LFC) model and China southern power grid model was presented, compared with the genetic algorithm and an engineering method. The case study shows that the Q-learning algorithm can enhance the robustness and adaptability of AGC systems in CPS assessment. © Chin. Soc. for Elec. Eng.

Wen H.,Northeast China Institute of Electrical Power Engineering | Xiao W.,Northeast China Institute of Electrical Power Engineering
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC | Year: 2013

A novel triple phase-shift (TPS) control strategy to extend the soft-switching operating range of the isolated bidirectional dual-active-bridge (DAB) dc-dc converter and achieve high efficiency in a large operating range is proposed. Controlled by the TPS scheme, four typical operating modes are identified with respect to the characterization of phase-shift groups. The power characteristics of operating modes are presented in terms of reactive power and rms current. The comparative analysis of the peak value of inductor current and efficiency for TPS and conventional PS (CPS) control are also presented. The improvement of efficiency is determined by the proper selection of operating modes and phase-shift group. Experimental results show good agreement with theoretical analysis. © 2013 IEEE.

Essalaimeh S.,Northeast China Institute of Electrical Power Engineering | Al-Salaymeh A.,University of Jordan | Abdullat Y.,University of Jordan
Energy Conversion and Management | Year: 2013

The present work shows an experimental investigation of using a combination of solar and wind energies as hybrid system for electrical generation under the Jordanian climate conditions. The generated electricity has been utilized for different types of applications and mainly for space heating and cooling. The system has also integration with grid connection to have more reliable system. Measurements included the solar radiation intensity, the ambient temperature, the wind speed and the output power from the solar PV panels and wind turbine. The performance characteristic of the PV panels has been obtained by varying the load value through a variable resistance. Some major factors have been studied and practically measured; one of them is the dust effect on electrical production efficiency for photovoltaic panels. Another factor is the inclination of the PV panels, where varying the angle of inclination has a seasonal importance for gathering the maximum solar intensity. Through mathematical calculation and the collected and measured data, a simple payback period has been calculated of the hybrid system in order to study the economical aspects of installing such a system under Jordanian climate conditions and for different usages and local tariffs including domestic, industrial and commercial applications. It was found through this work that the generated electricity of hybrid system and under Jordanian climate conditions can be utilized for electrical heating and cooling through split units and resistive heaters. © 2012 Elsevier Ltd. All rights reserved.

Wang Y.-Z.,Jiangsu University | Zhang X.-B.,Northeast China Institute of Electrical Power Engineering
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

The vibration response of flexible beam under the action of coupled multi-moving-masses with variable speeds was studied. Based on the vibration theory of flexible beam, the vibration model of the multi-moving masses-flexible-beam system was established. The interaction among the moving masses and the coupling effect between the motions of moving masses were considered in the model and the vibration of the flexible beam was analysed. The numerical simulation was conducted by using the solving method of time-variant mechanical system. The results show that the vibration response of the flexible beam is different under different forms of relative motions among the moving masses, and the coupling effect among moving masses enhance the vibration response of the flexible beam.

Li Y.,Northeast China Institute of Electrical Power Engineering
Proceedings of the 2011 2nd International Conference on Digital Manufacturing and Automation, ICDMA 2011 | Year: 2011

The transformation of ordinary machine tools are CNC machining of small and medium enterprises to improve the accuracy of a way to reduce the auxiLiary processing time is now shorter processing time is a major means of automatic rotary tool holder so the transformation is the main part of NC. © 2011 IEEE.

A superconducting magnet system for nuclear magnetic resonance with a high magnetic field and a high degree of homogeneity of magnetic field is provided. The system comprises a main coil and a magnetic field homogeneity compensating coil having a combination of a forward current and a reverse current, and is composed of 24 superconducting coils formed by winding NbTi/Cu low-temperature superconducting wires. The system can produce a magnetic field of 9.4 T within a room-temperature space of 800 mm and can obtain a degree of non-homogeneity of magnetic field less than 0.1 ppm within a spherical volume of 300 mm. The system is equipped with a superconducting magnet inside, and a low-temperature vessel for liquid helium provides a low-temperature environment of 4K which is required for the normal operation of the superconducting magnet. A ferro-magnetic shielding system enables the system to have a good electromagnetic compatibility.

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