Harbin Institute of Large Electrical Machinery

Harbin, China

Harbin Institute of Large Electrical Machinery

Harbin, China
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Binama M.,Harbin Institute of Technology | Su W.-T.,Harbin Institute of Technology | Li X.-B.,Harbin Institute of Technology | Li F.-C.,Harbin Institute of Technology | And 3 more authors.
Renewable and Sustainable Energy Reviews | Year: 2017

Energy is unarguably the key factor for today's economic and social development within nations. Electricity as one of many energy forms is a critical input to developing countries in the struggle to the national self-satisfaction in all domains. Rural electricity supply involved institutions have recently recommended the pump as turbine (PAT)-based micro hydropower plant (MHP) schemes for remote off-grid electrification, mostly from their economic advantages. However, from different published research findings, PAT-based MHP is not only simple and economically feasible, but has presented bottlenecks in the move to its full understanding. Moreover, compared to other clean energy technologies, PAT technology has not found much literature in academic published researches, thus contributing to its limited understanding within the community. Therefore, the PAT literature availability is one way to level up its understanding, which can be helpful to academic and professional communities. In the present study, a state-of-the-art review on the two most challenging PAT aspects, namely PAT performance prediction and PAT flow stability aspects are presented. In the presented literature, the selected energy sources history leading to the actual MHP global adoption was first briefly explained, followed by an intensive literature on PAT operations, where details about PAT selection and performance prediction were provided. Finally, the PAT flow stability aspects where pump-turbine S-shape and Saddle-type characteristics constitute the main focus, were discussed. It is worth an attention to mention that the words “pump-turbine”, “Pump as turbine”, and “reversible pump turbine” are equally used throughout the whole literature. It is within the authors wish that this paper can scale up the reader's PAT technology understanding, thus serving awareness in the same. © 2017 Elsevier Ltd

Liu J.,Harbin Institute of Large Electrical Machinery | Jiang T.,Harbin Institute of Large Electrical Machinery | Pang L.,Harbin Institute of Large Electrical Machinery | Lu G.,Harbin Institute of Large Electrical Machinery
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2017

Karman vortex phenomenon near downstream side of a group of hydro turbine flow passage components with same outlet edge thickness and different outlet edge angle is simulated, by using numerical simulation method. Influence of outlet edge angle on Karman vortex frequency is studied. The results show that Karman vortex frequency decreases with an increasing outlet edge angle. Karman vortex frequency obtained by numerical simulation method decreased to one third as compared with the one obtained by using Karman vortex frequency theoretical formula for flow around circular cylinder, when outlet edge angle is increased to 30°. Based on the comparison between results of numerical simulation and values obtained by theoretical formula, and data processing, Relation curve and approximate linear fitting formula between Strouhal number outlet edge angle of flow passage components are obtained. By compared with the test data of Karman vortex vibration of stay vane outlet edge of an hydro turbine, accuracy of Karman vortex numerical simulation method for hydro turbine flow passage components is validated, and Strouhal number calculation formula is also validated. The research shows great significance in optimal shape design of outlet edge of hydro turbine flow passage components and avoiding vibration induced by Karman vortex. © 2017 Journal of Mechanical Engineering.

Xu J.,Harbin University of Science and Technology | Yin X.,Harbin University of Science and Technology | Cui X.,Harbin University of Science and Technology | Liu Z.,Harbin Institute of Large Electrical Machinery
AIP Conference Proceedings | Year: 2017

A realization method for rotating speed measurement is put forward in this paper. Timer 1 of STM32F103 is used to count the external pulses and its timer 2 is used to count the internal clock pulses. Two timers are set in master-slaver synchronous mode, and the rotating speed is computed based on different M/T method. This realization method can ensure the two timers strictly synchronously work, and the counting value of the master timer can also be set dynamically according to rotating speed. This method has high measurement accuracy and wide measurement range, and is easy to realize. © 2017 Author(s).

Zhu B.,Tsinghua University | Wang X.,Tsinghua University | Tan L.,Tsinghua University | Zhou D.,State Grid Corporation of China | And 2 more authors.
Renewable Energy | Year: 2015

Frequent changes between pump and turbine operations pose significant challenges in the design of pump-turbine runners with high efficiency and stability. In this study, a multiobjective optimization design system, including a 3D inverse design, computational fluid dynamics, design of experiment, response surface methodology, and multiobjective genetic algorithm, is introduced and applied to the design of a middle-high-head pump-turbine runner. The key parameters in the design, including the blade loading, the blade lean at the high-pressure side of the runner, and the meridional channel shape, were selected as the optimized parameters. Two runners, one with a large positive blade lean and another with a large negative blade lean, were selected for further numerical investigations and measurements. Model tests show that both runners have good power performances. The runner with a negative blade lean has better stability than the runner with a positive blade lean. © 2015 Elsevier Ltd.

Deyou L.,Harbin Institute of Technology | Hongjie W.,Harbin Institute of Technology | Gaoming X.,Harbin Institute of Technology | Ruzhi G.,Harbin Institute of Technology | And 3 more authors.
Renewable Energy | Year: 2015

Presently, hydropower is the world's largest source of renewable energy. Pump Storage Power Plant develops the rapidly because of its effective electricity storage and becomes the most part of hydropower. A pump turbine is the vital component of a Pump Storage Power Plant. To obtain efficient generation, safe and stable operation of a pump turbine is pretty important. However, the existence of the hump characteristics of a pump-turbine in pump mode usually leads to operating instability. Thus it is necessary to analyze regions of the hump characteristics. In this research experimental investigation and numerical simulation are employed in order to study the hump characteristics. Unsteady incompressible turbulent flow simulations for the full pump turbine model water domain are performed using the SST k-ω turbulence model. A refinement grid is generated, which allows the corresponding y-plus values of the runner blades, stay vanes and guide vanes less than 2 in average. Calculation results of torque in different discharges as well as head and efficiency in the small discharge regions are in solid agreement with the experimental data. The results show that there are three vortex groups which distribute in the tandem cascade passages when entering the hump region. They are equally located in the circumferential direction in the tandem cascade, and one vortex group is located in two passages of the special stay vane. The strength and range of the vortex group change with different discharges. It also shows certain instability during one runner revolution. This work can provide a basic understanding for the improvement of the stable operation of a pump turbine. © 2014 Elsevier Ltd.

Ji X.-Y.,Wuhan University | Ji X.-Y.,Harbin Institute of Large Electrical Machinery | Lai X.,Wuhan University
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A | Year: 2011

The question of startup is more and more in turbine mode of the pump-turbine at present. It is key technology to the pumped storage power station. The flow regimes of the pump-turbine were calculated by SST k-ω turbulence model to study the hydraulic behaviors on the 'S' area in turbine mode at various guild van openings and mass flows. Comparing the results of the calculation and the test, it is shown that the reasonable method is applied. The across flow is a great factor to the startup in turbine mode of the pump-turbine.

Ge B.,Harbin University of Science and Technology | Li M.,Harbin University of Science and Technology | Sun Y.,Harbin Institute of Large Electrical Machinery | Li J.,Harbin Institute of Large Electrical Machinery | Hu L.,Harbin Institute of Large Electrical Machinery
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

Nowadays hydro-generators are usually equipped with the damper winding. The accuracy of the calculated the damper windings currents will affect the generator's performance directly. Especially when generator operates in asymmetric conditions, the currents induced by the negative magnetic field will influent the generator's performance greatly. Therefore, to calculate the currents of the damper windings accurately gets really necessary while studying the asymmetric performance of the generator. The field-circuit coupled method is applied in the paper to calculate the damper winding currents as the generator operates in asymmetric conditions. By building the mathematical model of the damper winding' send, the effect from the nonlinear magnetic field at the end of the rotor is considered in the paper. Meantime the damper winding currents are also calculated through the conventional process which deal the magnetic field at the end of the damper winding with analytical method. And then, the calculated results from the both methods mentioned above are compared with the results acquired from the test, in which the instantaneous value of the damper bars currents can be measured directly. The comparison shows that the method applied in the paper is more accurate when calculating the damper winding currents when the magnetic field at the end of the rotor saturates extremely. © 2013 Chinese Society for Electrical Engineering.

Sun Y.,Harbin Institute of Large Electrical Machinery | Luan Q.,Harbin Institute of Large Electrical Machinery
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2014

Working group subjects and academic papers for study committee of rotating electric machines of CIGRE'2014 are introduced. The scope involves technology progress of turbogenerators, hydrogenerators, wind-driven generators and large motors in the areas of CIGRE Study Committee Al: rotating electric machines (CIGRE SC A1). © 2014 State Grid Electric Power Research Institute Press.

Wang L.,Zhejiang University | Yin J.,Zhejiang University | Jiao L.,Zhejiang University | Wu D.,Zhejiang University | Qin D.,Harbin Institute of Large Electrical Machinery
Science China Technological Sciences | Year: 2011

The performance of a reversible pump turbine with S-shaped characteristics is of great importance to the transition processes such as start-up and load rejection. In order to predict the S-shaped curve accurately and develop a reliable tool for design improvement, a shear stress transport model (SST) with various numerical schemes for pressure term in the governing equation was investigated in a whole pump turbine including spiral casing, stay vanes, guide vanes, runner and draft tube. Through the computation, it was shown that different zones in the curve should employ different schemes to get the solution converged. Comparison of discharge-speed performance showed that good correspondence is got between experimental data and CFD results. Based on this, internal flow analysis was carried out at three typical operating points representing turbine mode, shut-off mode and reversible pump mode, respectively. According to the flow field concerned, the mechanism for the speed-no-load instability was explained, which provides good guidelines to take countermeasures in future design. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg.

Liang Y.-P.,Harbin University of Science and Technology | Sun Y.,Harbin University of Science and Technology | Sun Y.-T.,Harbin Institute of Large Electrical Machinery
Dianji yu Kongzhi Xuebao/Electric Machines and Control | Year: 2011

The transposition technique of stator bar is one of the key techniques in 1000 MW hydro-generator design, and the suitable transposition method can reduce the circulating current losses of stator winding better, and improve the efficiency. Four common transposition methods for hydro-generator were analyzed in this paper, including 360° bar transposition, 0°/360°/0°bar transposition with void, deficient 360° void bar transposition and 0°/360°/0° extended bar transposition. The circulating current losses of stator bar for 1000 MW hydro-generator with four transposition methods were calculated and analyzed using leakage susceptible potential method. The calculation results indicate that the transposition methods have great influence on distribution of circulating current losses, and the losses are the smallest when using 0°/360°/0° prolonged transposition method for hydro-generator, accounting for 15.3% of 360° bar transposition circulating current losses, followed by deficient 360° void bar transposition, occupying 25.9% of 360° bar transposition circulating current losses.

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