Multi-energy storage DC power distribution network coordination control method and system

Abstract

The invention relates to a multi-energy-storage DC power distribution network coordination control method and system, and the method comprises the steps: obtaining a voltage compensation amount through a voltage prediction model according to the bus voltage of each energy unit, and obtaining the voltage compensation amount according to the output current of a DC-DC converter in each energy storage unit, the charge state information of each storage battery, and the charge state information of each storage battery; and obtaining a current compensation amount by using a current model, obtaining a duty ratio by using a duty ratio adjustment model according to the voltage compensation amount and the current compensation amount, and obtaining a switching signal through PWM modulation to control the bus voltage and the output power of the energy storage unit. The optimization compensation method based on droop control is adopted, the voltage compensation amount and the current compensation amount are solved through model prediction control, and on the basis of reasonable power distribution, the problem that the performance of a controller is unstable under a consistency algorithm is effectively solved through a flexible and variable prediction coefficient; and safe and stable operation of the DC power distribution network can be well promoted.

Description

technical field [0001] The invention relates to the technical field of power distribution control, in particular to a method and system for coordinated control of a multi-energy storage DC distribution network based on model predictive control. Background technique [0002] As one of the main ways to reduce carbon emissions, renewable energy power generation technologies such as wind power and photovoltaics have received extensive attention. Compared with the traditional AC distribution network whose power supply reliability is greatly affected by the grid connection of distributed generation systems, the DC distribution network occupies an increasingly important role in today's ever-increasing demand for DC loads due to its low loss characteristics. status. [0003] In a DC distribution network with multiple energy storage units, due to the existence of line impedance, droop control cannot take into account the reasonable distribution of the output power of each unit and t...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-energy storage DC distribution network coordination control method and system based on model predictive control. The optimal voltage and power compensation can be obtained through the rolling optimization of the predictive model and the minimization of the objective function, which solves the problem of traditional consensus Poor transient characteristics of the voltage control strategy under the linear algorithm and control errors exist in some working conditions, which is conducive to the safe and stable operation of the DC distribution network

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