A method for selecting a control strategy for a converter in an energy regenerative system

Abstract

The invention discloses a method for selecting control strategies of a converter in an energy feedback system. The control strategies of the converter in the energy feedback system comprise inversion, rectification and non-inversion and non-rectification. The method comprises the following steps that the bus voltage of a traction network is measured and stored in a first storage unit, and the initial control strategy of the converter is set into non-inversion and non-rectification and stored in a second storage unit; and the bus voltage of the traction network is measured every manually-set first time interval, after the measurement voltage value is measured every time, the sub process is executed, and the executing period of the sub process does not exceed the first time interval. By adoption of the method for selecting control strategies of the converter in the energy feedback system, energy feedback starting or stopping can be achieved in time or even ahead of time, and it is guaranteed that braking energy can be timely fed back or supplied through the traction network, so that the condition that due to overvoltage, rail transportation facilities are damaged, or due to excessive absorption of traction network energy, operation of the rail transportation facilities is affected is effectively avoided.

Description

technical field [0001] The invention relates to the field of control strategies of converters in energy feedback systems, in particular to a method for selecting a control strategy for converters in energy feedback systems. Background technique [0002] At present, rail transit has increasingly become a transportation facility commonly used by people for daily travel, and it plays a major role in transportation. Rail transit facilities are mainly powered by electric traction. Since rail transit facilities start and brake frequently, it is easy to cause energy loss. In order to improve the energy utilization rate of rail transit facilities, a regenerative energy feedback system is usually used to recover the energy generated by the braking of rail transit facilities. Recycling, as well as the energy required for instant replenishment of rail transit facilities; in order to achieve this function, traditional regenerative energy feedback systems often use the method of real-tim...

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Problems solved by technology

Rail transit facilities are mainly powered by electric traction. Since rail transit facilities start and brake frequently, it is easy to cause energy loss. In order to improve the energy utilization rate of rail transit facilities, a regenerative energy feedback system is usually used to recover the energy generated by the braking of rail transit facilities. Recycling, as well as the energy required for instant replenishment of rail transit facilities; in order to achieve this function, traditional regenerative energy feedback systems often use the method of real-time monitoring of the bus voltage of the traction network to achieve, but this method still has a certain hysteresis , the real-time performance is not enough, resulting in the regenerative energy feedback system may not be able to recover the braking energy in time during the braking process, resulting in overvoltage of the traction network and damage to the rail transit facilities; The rail transit equipment cannot be started smoothly due to the energy

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