An optimization method for improving the subway train regenerative braking energy utilization rate

Abstract

The invention discloses an optimization method for improving the regenerative braking energy utilization rate of a subway train, which comprises the following steps of: 1, equivalently expressing theregenerative braking energy utilization rate according to the traction and braking overlapping time of adjacent trains in a same power supply interval; 2, establishing a homodromous train tracking operation integer programming model; Step 3, establishing an integer programming model for tracking operation of the opposite train; And step 4, solving the train tracking operation integer programming model by adopting an improved differential evolution algorithm to obtain an optimized train departure interval, stop time and opposite opening time. The method is applied to the rush hours in the morning and evening and non-rush hours; Train operation traction and braking overlapping time maximization is taken as a target. A train tracking operation optimization model is established, the train departure interval, the stop time and the opposite opening time are optimized through an improved differential evolution algorithm, the traction and braking overlapping time of adjacent trains or oppositetrains is increased, the utilization rate of regenerated energy is increased, and the total energy consumption of the system is reduced.

Description

technical field [0001] The invention relates to an optimization method for improving the utilization rate of regenerative braking energy of subway trains, belonging to the technical field of urban rail traffic control. Background technique [0002] Urban rail transit has the characteristics of safety, comfort, punctuality, and energy saving. It has always been the key public transportation mode for the development of various large and medium-sized cities. While the mileage and traffic volume of subway construction have increased, the energy consumption of the subway system has also risen rapidly. The energy consumption of train traction is the main part of the total energy consumption of trains. Therefore, reducing the energy consumption of train traction is extremely important to reduce the energy consumption of the subway system. In the existing research, researchers have achieved a large number of research results to reduce the energy consumption of train operation by opt...

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Problems solved by technology

[0003] At present, the utilization of regenerative energy mainly includes three types: resistance energy consumption, energy storage feedback and adjacent vehicle absorption. Dissipated, this method not only cannot effectively use the regenerative energy, but also increases the ventilation burden of the tunnel due to heat dissipation; the energy storage feedback type requires additional equipment, complex maintenance, and increased costs; the third type of adjacent car absorption is a direct utilization method. The method is to use the regenerative energy generated by the braking trains for the traction power consumption of other trains in the same power supply section by coordinating the tracking running time of the trains to reduce traction energy consumption. This method is currently the most effective way to use regenerative braking energy. Therefore, on the basis of optimizing the operation curve and control strategy of a single train, it is necessary to study how to improve the utilization rate of regenerative energy by optimizing the train operation diagram, so as to reduce the total energy consumption of train operation

[0004] The number of trains on the line and the departure interval have an important impact on the utilization of regenerative braking energy. The higher the traffic density is, the higher the effective utilization rate of regenerative braking energy is, and the lower the traffic density is, the lower the effective utilization rate of regenerative braking energy is. When it is greater than 360s, it is meaningless to optimize the coordinated control of the front and rear vehicles. This is mainly because the utilization of regenerative braking energy is real-time, and the transmission loss is too long if the distance is too long. no other vehicles

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