Storage battery charge state equalization method based on self-adaptive regulation factor

Abstract

The invention relates to the technical field of direct current networking operation control, in particular to a storage battery charge state equalization control method based on an adaptive regulation factor, and the method comprises the following steps: utilizing communication between a local charge state of a storage battery and a charge state of a storage battery directly adjacent to the local charge state of the storage battery, and adopting a consistency algorithm to calculate and obtain an average value of all storage batteries; the droop coefficient and the current of the output end of the DC / DC converter are multiplied to be transmitted to a double-closed-loop control layer; summing the ideal voltage of the bus output voltage, the difference value I and the power compensation value, and subtracting the summed sum from the voltage of the droop unit and the bus to obtain a difference value II; performing voltage and current control on the difference value II to obtain a control signal I; the control signal I is modulated through the pulse width modulation technology, stable output voltage is achieved, the charge states of a plurality of storage batteries are balanced, a control signal II is generated, three SoC balance adjustment factors are introduced in the method, the convergence speed of the SoC is increased, and the problem that later-period balance of a traditional SoC is slow is solved.

Description

technical field [0001] The invention belongs to the technical field of DC network operation control, and relates to a method for balancing the state of charge of a battery based on an adaptive adjustment factor. Background technique [0002] With the development of global trade and shipping industry, fossil energy is gradually depleted, and the problem of pollution discharge from ships has become increasingly prominent. Ship distributed power generation technology based on new energy power generation has received extensive attention. Compared with the ship's AC networking method, the ship's DC networking has low cost and no frequency, phase and other problems, and is more suitable for new energy access, and has an increasingly broad development prospect. Due to considerations of cost, safety and technology, multiple battery energy storage units (BESUs) are usually installed on electric propulsion ships. BESUs are connected in parallel to the DC bus through converters to pro...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that due to the parallel operation of multiple BESUs, the traditional droop control will cause some batteries to quit running early, and the phenomenon of "overcharge and overdischarge" will occur, so that the energy of the battery cannot be fully utilized and the service life of the battery will be affected. The technical solution is: a method for balancing control of battery state of charge based on an adaptive adjustment factor, comprising the following steps:

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