Simulation method for energy storage type regenerative energy absorbing device suitable for power flow simulation calculation

Abstract

The invention provides a method for simulating an energy storage type regenerative energy absorbing device suitable for power flow simulation calculation, comprising the following steps: establishing a main circuit model, which is formed by connecting two branches in parallel, one of which is composed of a switching element K 1 , resistance element R , controlled voltage source U sc Formed in series, branch two consists of switching elements K 2 , controlled current source I sc Formed in series; establish the calculation unit of the control system, which is based on the constant parameters set before the simulation and the DC grid side voltage of the main circuit model collected in the simulation u dc , DC grid side input current i dc , and the control signal output by the calculation unit of the control system at the last simulation step soc , for each simulation step calculation. The invention simulates the complex electrical external characteristics of the energy storage type regenerative energy absorbing device by establishing a general-purpose main circuit model and a control system calculation unit, without building a converter circuit containing a large number of power electronic devices, which not only meets the engineering accuracy requirements, The simulation speed is also guaranteed.

Description

technical field [0001] The invention belongs to the field of power flow simulation calculations for rail transit power supply systems, in particular to an energy storage type regenerative energy absorbing device simulation method suitable for power flow simulation calculations. 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 rise in the tu...

AI Technical Summary

Problems solved by technology

[0010] 2) The current energy storage percentage does not reach the upper limit of the energy storage percentage, and the input power reaches the rated power

[0022] At present, in the power flow simulation calculation of urban rail transit power supply systems, the generalized load simulation method for energy storage regenerative energy absorbing 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 storage. Complicated Electrical External Characteristics of Energy Type Regenerative Energy Absorbing Device

Images