In this paper, a mathematical modeling is set up based on the trigger equipment of light electric vehicle speed control system, and the unit step response curve of dual closed-loop speed control system is given by using the simulation software simulink. A conclusion can be drew that the unit step response...

The porcelainous PTC heater is used in electric locomotive cab to improve thermal comfort. In this paper, experiments were taken to test the heat transfer performance of the porcelainous PTC heater in the aspects of heat propagation distance and the interference between air inlets and outlets. The structure...

In power grid which contains a variety of power recourses (wind, solar and thermal power), the gas-steam combined cycle unit need to undertake the main peak load regulation task so that they have to work at the low load or variable load for a long time, and the operation method will have a significant...

Microgrid (MG) power system plays an important role to fulfill reliable and secure energy supply to critical loads of communities as well as for communities in remote area. Distributed Generation (DG) sources integrated in a MG provides numerous benefits, at the same time leads to power quality issues...

The anti-galloping method was proposed for the 6×1520 mm2 large cross section conductor. The galloping model was established by using nonlinear finite element method and considering geometric nonlinear, aerodynamic nonlinear and initial deformation. The galloping characteristics and the critical conditions...

Combining with the existing transmission technology which is feasible in engineering and theory, four types of ultra-long-distance transmission mode, in terms of UHV AC, UHV DC (±800 kV and ±1 000 kV) and Half-wavelength AC transmission system (HWACT), have been introduced. The reliability and the economy...

Output power of Photovoltaic generation system is influenced by temperature, humidity, solar radiation intensity and so on. The effects of three kinds of external climate conditions, including temperature, humidity, solar radiation intensity, on photovoltaic output power were anal sized in detail in...

In order to reduce the safety loophole for substation caused by rainwater leakage of roof, this paper proposed an on-line monitoring for rainwater leakage of substation roof based on a parallel plate capacitor sensor. This method is based on the capacitance sensor in the composition of installed metal...

The cyclic variations in spark ignition engines occurring especially under specific engine operating conditions make the maximum pressure variable for successive in-cylinder pressure cycles. Minimization of cyclic variations has a great importance in effectively operating near to lean limit, or at low...

Based on conventional incremental conductance (Inc-Cond) method, a fuzzy controlled incremental conductance controller is proposed for Z-source PV inverter to realize its maximum power point tracking (MPPT). The principle of Z-source PV inverter is illustrated. Then an improvement of SVPWM for Z-source...

A method for simulating welding defect of slags or incomplete fusion is raised in this research. Experiments on seven full-size members were conducted.The research shows that the length of the welding defect is related to the decrease of the ultimate bearing capacity of the members under the static axial...

The proposed of PA (product architecture) makes the product development varied and effective. However, in the current society, focusing on the product to develop new products isn’t satisfying the user’s needs that become abundant and uneasy to be found. PA provides a systematic research framework that...

In the present study, the special interface element has been derived. And that develop three-dimensional nonlinear finite element model depicting the global behavior for RC structure strengthened by steel plates up to failure. The interface element captures not only the shear and normal stress concentration,...

The investment for distribution network construction is an important part of power grid construction. The establishment of analysis model for the investment and operational efficiency of distribution network construction is able to ensure the economic operation and reliability of power system, and has...

Linguistic variables usually take the form of a base term modified by a hedge in qualitative evaluations of multi criteria decision making problems. In this paper, the linguistic fuzzy rough set is presented to objectively model non-inclusive hedges, such as more or less and roughly, with semantics....

Advanced composite materials have gained popularity in aircraft industry. The widespread application leads to the requirement of high efficient and reliable maintenance technology for composite components. Bonded composite repairs are preferred as they provide enhanced stress transfer mechanisms, joint...