Subway bidirectional converter control device and method based on ANPC three-level inverter

Abstract

The invention discloses a subway bidirectional converter control device and method based on an ANPC three-level inverter. The control method comprises the steps that controlled quantity issuing and inverter module working state uploading are carried out between a main controller and a bottom layer controller installed in an ANPC three-level inverter module; a DSP in the main controller receives anoperation command, performs direct-current voltage stabilization and ANPC three-level inverter midpoint voltage equalization, two ANPC three-level inverter module groups are connected in parallel tooutput total current to perform closed-loop control, and a signal is obtained by adopting an intermittent space vector modulation DSVPWM method; the signal is compared with two triangular carriers with 180-degree phase dislocation in a main controller FPGA (Field Programmable Gate Array) to obtain signals, and the signal is issued to inversion modules of the two inversion module groups; and a bottom controller FPGA receives the signals of the main controller, restores the signals into 18 paths of standard PWM signals by adopting an ANPC control mode, and controls all IGBT switches in the corresponding ANPC three-level inversion modules to act.

Description

technical field [0001] The invention relates to the technical field of urban rail transit power supply systems, in particular to a subway bidirectional variable current control device and control method based on an ANPC three-level inverter. Background technique [0002] In recent years, my country's urban rail transit has developed very rapidly. In order to respond to the national energy-saving and emission-reduction policy, the domestic subway traction power supply system gradually promotes the mode of diode rectifier unit + regenerative braking energy feedback device to achieve the purpose of reducing energy consumption. However, the voltage of the DC traction network output by the diode rectifier unit will drop greatly as the load increases, resulting in a short power supply distance, requiring an increase in the number of traction power supply stations, and increasing the construction cost of the subway. At the same time, the added regenerative braking energy feedback d...

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Problems solved by technology

However, this patent does not disclose the specific inverter circuit topology used, and the two inverters themselves do not have a modular parallel design, which cannot flexibly cover the needs of different current levels.

[0006] In summary, the above two solutions have their own defects and cannot fully meet the actual on-site needs.

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