Multiple-target integrated control energy-saving method of electric power supply system for subway

Abstract

A multi-object comprehensive control energy conservation method of a subway power supply system fully recovers and utilizes the braking energy, and overcomes the shock to the electric network caused by the energy fed back instantaneously through part of the absorbed energy and the feedback energy. When energy is required for starting or accelerating the train within the power supply section, two parts of circuits are comprehensively controlled to release the excessive electric energy with the aim of maintaining the basic electric energy storage of the independent condenser banks. During the running process of the trains, the advanced algorithm is adopted for reasonable energy distribution, thereby achieving the purpose of the optimal performance of the entire system, improving the utilization factor of the recovered energy and enhancing the energy conservation effect. The control system further detects the harmonic wave and the reactive component of other non-traction load of the traction substation, triggers an AC / DC converter module to compensate for the harmonic wave and the reactive component of the part, and avoids the pollution of the electric network so as to further reduce the loss caused by the harmonic wave and realize the control of the multi-object comprehensive energy conservation.

Description

technical field [0001] The invention relates to a multi-objective comprehensive control energy-saving method, which is an energy-saving method applied to a subway power supply system. It belongs to the field of power electronics and electric drive technology. Background technique [0002] The urban rail transit network, which is a large electricity consumer, can adopt DC / DC chopping and DC / AC variable voltage and variable frequency transmission methods, both of which can feed back the braking energy to the DC grid. If there is energy needed for train starting or acceleration in the DC grid power supply section at this time, this part of the feedback energy can be used. However, when the braking energy cannot or cannot be completely absorbed by other trains, it will cause the DC bus voltage to rise beyond the tolerance value and affect the normal operation of the system. [0003] Therefore, the commonly used braking method of existing subway trains is electric braking (rege...

AI Technical Summary

Problems solved by technology

At present, the existing flywheel energy storage type or capacitor energy storage type braking technology has certain practical value, but the energy storage element of the flywheel energy storage type braking technology is a flywheel motor. Very large, so the problem of friction and energy consumption is serious, and the working life of the flywheel is short

However, the absorption equipment of the existing capacitive energy storage braking technology must release and consume the electric energy on the capacitor every time it stores full electric energy, otherwise the next working capacitor cannot absorb the braking energy

These defects limit the further improvement of energy-saving effect to a certain extent

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