Study on selection method of electric braking power for railway vehicles with AC drive;

The analysis and discussing of electric braking method in hydropower station;

For solving the existing problems of machine braking and electrical braking during the process of stoppage of a turbogenerator set,a magnetic reducing method is recommended,which can greatly reduce the current of generators at switch due to remainder magnetic and abate the demand for braking switch.

The four kinds of electrical braking modes of AC inverter speed regulation systems, DC braking?power braking?regenerative braking and intercommunity DC BUS multi-inverter drive are detailed, the applying ranges and modes selection and calculation of different braking modes are given.

In order to acquire dynamics performance of threephase induction motor during electrical braking operation, the simulation model was established based on MATLAB/SIMULINK, according to mathematical model of induction motor in dq still coordinate system.

The principle of electric brake for hydro-turbine units and the main parameters are briefly discussed.

The Ni erji hydroelectric power station electric power unit adopt electric brake arrangement effective shorten unit stop time and settle a question of unit stop process bring about wear and tear and pollution in high speed rotation etc.

The electric brake of AC shaft hoist is an important part on hoisting technics low frequencies power generation brake and power are widely used in the shaft hoist of AC asynchronous drive at present.