Inversion feedback type regeneration device simulation method suitable for power flow simulation calculation

Abstract

The invention provides an inversion feedback type regeneration device simulation method suitable for power flow simulation calculation, and the method comprises the following steps that a main circuit model which is formed by connecting two branches in parallel is established, wherein the first branch is formed by connecting a switch element K1, a resistor element R and a controlled voltage source Uiv in series, and the second branch is formed by connecting a switch element K2 and a controlled current source Iiv in series; a control system calculation unit is established, and calculation of each simulation step length is carried out according to constant parameters set before simulation and the direct current network side voltage udc and the direct current network side input current idc, collected in simulation, of the main circuit model. Complex electrical external characteristics of the inversion feedback type regeneration device are simulated by establishing the universal main circuit model and the control system calculation unit, a converter circuit containing a large number of power electronic devices does not need to be established, the engineering precision requirement is met, and the simulation speed is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of power flow simulation calculation of a rail transit power supply system, and in particular relates to a simulation method of an inverter feedback type regeneration device suitable for power flow simulation calculation. Background technique [0002] At present, most urban rail transit power supply systems use rectifier units to convert electric energy from three-phase alternating current to direct current to power trains. Since the diode rectification circuit of the rectifier unit can only flow energy in one direction, a large amount of regenerative braking energy generated by the train during frequent braking cannot be returned to the upper-level AC network of the power supply system through the rectifier unit. If the regenerative braking energy generated by a train cannot be absorbed by adjacent trains, it will be consumed on braking resistors or brake shoes, resulting in energy waste and temperature ris...

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Problems solved by technology

[0013] At present, in the power flow simulation calculation of urban rail transit power supply systems, the generalized load modeling method for inverter feedback regenerative devices is basically equivalent to the model of voltage source plus internal resistance or the model of pure current source, which cannot accurately simulate the equivalent of the inverter. The Complicated Electrical External Characteristics of Variable Feedback Regenerative Device

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