This paper presents a new structure form of prestressed anchor block with arch-shaped cavity used in spillway pier structures. With the arch-shaped cavity, the problem of excessive tensile stress associated with the rectangular-shaped cavity can be resolved. Five different finite element models with...

Modular multilevel converter(MMC) can be used in DG system. The double closed-loop control strategy including dc bus voltage outer loop and current inner loop is adopted in the control system, which makes dc bus voltage stable even when active power changes. The current inner loop has a new control strategy...

Vertical axis turbines have many attractive features and are well suited for extraction of wind and hydrokinetic energy. At low angular velocities, the rotor blades momentarily experience high angles of attack and move in and out of stall. This gives rise to unsteady aerodynamic loads that may cause...

High Voltage Direct Current (HVDC) transmission has been expanding due to rapid development of power electronics technology and by the need for connection of offshore or remote wind farms and / or large hydro power generators. HVDC transmission has several benefits such as lower transmission losses,...

Transient Recovery Voltage (TRV) requirements for UHV and EHV circuit breakers were investigated with the simple radial and meshed network models by CIGRE WG A3.28 and it was confirmed that the CIGRE network models could provide the TRV behaviours effectively using the system and equipment parameters...

Parallel operation control is one of the key techniques for high performance inverters with the features of excellent regulation, modular, high reliability, and redundancy. Through theoretical analysis of multi-inverters parallel operation model, the paper derived the conventional droop control method,...

A functional safety pressure transmitter (SPPT) which was based on self-diagnostic is introduced. Challenge in safe communication is discussed, too. SPPT’s hardware design, software design and diagnostic design is given. Furthermore, the safety communication design of SPPT is introduced, too. At last,...

With the scale of interconnected power systems becoming larger and larger, asynchronous oscillation occurs increasingly frequently. Under this circumstance, the identification of out-of-step oscillation along with corresponding separation strategy plays a vital role in preventing catastrophic black outage...

Gear boxes and direct-drive systems are commonly used in the transmission of large wind turbines. The components such as blades, rotor, gear box and the generator should be set up coaxially in the nacelle. Thus, the total weights of the nacelle increases with the size of the wind turbines. This research...

A novel weak capacitance measurement system is proposed to measure the gas-solid two-phase flows. The system is mainly consist of capacitance sensor, Micro-programmed Control Unit (MCU), Direct Digital Synthesizer (DDS), operational amplifier, analogue multiplier and low-pass filter. Since the stray...

In order to effectively restrain the high-frequency harmonic components in compensation current and reduce the reactive power compensation claim to the dc voltage amplitude, we present a new topology of Static synchronous compensator (STATCOM). This method changes the property of impedance by connecting...

The SOC (state of charge) of the Li-ion battery cells in a pack are different because of the property differences, which would lead to over-charging/over-discharging the battery pack and as a result the service life of the battery pack would be reduced. In this article, we designed a battery management...

This paper is based on the application of automobile ECU remote update in order to facilitate automotive remote update. At first, related technology of Bootloader was introduced. System design project of automobile ECU Bootloader was completed according to the design requirement. Then “incremental update”...

In this paper, a new approach for synthesis of the accommodation system to faults of navigation sensors of underwater vehicles (UV) is developed and investigated. Proposed system is synthesized by using kinematic model of UV and data fusion of sensors signals. The results of performed simulation have...

To study the seismic performance of a souring sluice, a 3D finite element model was established by considering the foundation characters. Mode-superposition response spectrum method was used to precede the seismic calculation. It is concluded that the seismic performance can satisfy the specification....

Theoretical profile stress and displacement of a certain non-overflow gravity dam in a key water-control project was studied in this paper. Plane finite element method and dam-rock coupling effect were both considered. It is concluded that the tensile stress concentration was appeared at the heel and...

Reservoir Classification and Evaluation is an important section in the process of the research for reservoir development. Based on the analysis of core capillary pressure data, this research proposed: The relationship between R35 (Mercury enters the saturation of 35% corresponding to the pore throat...

Energy and environmental problems are more serious at present and people realized that the development of traditional engines is limited, and all countries in the world began studying all kinds of new piston engines. In history, there have been various types of engine to replace the traditional ones....

With the continuous development of urbanization, solid garage is playing a more and more important role in city infrastructure. In this paper, a mathematic model on queuing theory for lift-sliding solid garage is constructed, and some important performance parameters are analyzed base on the quening...

Current researches on landslide prevention are mostly based on time-displacement curve or some other corresponding characteristic parameters rather than landslide evolution. But landslide varies a lot from different mechanisms and evolution stages, it is necessary to study it from aspect of evolution....

In order to solve the problem of determining the value of mechanical parameters of ice in the prevention and cure of ice flood disaster, on the basis of experimental methods of classical mechanics, through improving the test equipment and controlling test conditions ,we obtain the strength, deformation...

At present, in the industrial production, have a high request for the reliability of the control equipment, to be able to in the electromagnetic interference, power voltage fluctuation, mechanical vibration and so on under the harsh environment and reliable work, and has strong anti-jamming ability....

The hydraulic steel gate, due to its specific operating environment, the corrosion is a major factor that causes its degradation. In this paper, by the sem and Tensile testing machine, according to the experimental study on the material of existing hydraulic steel gate structure, its chemical composition...

The article proposed a combination optimization method of load ratio and equilibrium power generation scheduling in long-term unit commitment base on the traditional long-term unit commitment method, which can satisfy the equilibrium generation scheduling needs, and improve the unit load rate as far...

A 2-DOF model with the coupling of vertical and torsional motions is considered to study galloping of transmission lines in this paper. Based on Lagrange equation, the equation of motion is established. dynamic analysis is obtained by using Newmark- method in an example. Finally, anti-galloping VED is...

For the current full-bridge series with the load-frequency induction heating power of the resonant frequency automatic tracking problems, analysis of the series resonant inverter load waveform changes in the work process, this paper designed a whole based on the frequency tracking circuit analog circuit,...

In this paper, in view of the influence of shimmer sights detection in mirror installation on the adjusting frame position and shape, Research on high-precision zero detection method can eliminate shimmer sights chucking errors. The method uses a CCD camera to measure the total of zero change, dual autocollimator...

The yield stress is a key rheological parameter of thick paste and critical design parameter of the high pressure pipeline system. Take coal slurry as an example, whether using vane method or curve extension method, the yield stress both exponentially increase with concentration increasing, but the data...

The paper introduced the construction method of large segment hosting and its difficulty, and drawing up the corresponding plan of liner and stress monitoring. The paper gives the calculation method of shear area for such a big cantilever thin-walled steel box girder section, namely the shear coefficient...