Photovoltaic DC power supply system and method for electrolytic aluminum electrolytic production

Abstract

The invention provides a photovoltaic DC power supply system and a method for electrolytic aluminum electrolytic production. The system comprises a photovoltaic power generation module, a fuel cell energy storage module, a space-time heterogeneous coupling controller and a power grid power supply module, wherein the photovoltaic power generation module provides DC power for an electrolytic aluminum electrolytic bath and charges the fuel cell energy storage module; the fuel cell energy storage module stores remaining power of the photovoltaic power generation module, and a stored gas is adopted as a fuel to obtain power to provide power for the electrolytic aluminum electrolytic bath; the power grid power supply module provides power for the electrolytic aluminum electrolytic bath; the space-time heterogeneous coupling controller selects a power input side of the electrolytic aluminum electrolytic bath according to the relationship between the photovoltaic power generation maximum power Ps of the photovoltaic power generation module and the rated power P0 of the electrolytic aluminum electrolytic bath; and according to voltage at different input sides and the rated voltage U0 of the electrolytic aluminum electrolytic bath, a needed duty cycle is calculated, and the output voltage at the power input side is controlled. The system relieves the power supply pressure and the peak regulation pressure of the power grid, and consumption of fossil energy is saved.

Description

technical field [0001] The invention belongs to the technical field of clean energy power supply and power electronic energy conversion, and in particular relates to a photovoltaic DC power supply system and method for electrolytic production of electrolytic aluminum. Background technique [0002] The aluminum electrolysis load is a primary load, and the electrolytic cell, multi-functional crane, air compressor station, substation rectifier and other loads in the electrolysis workshop are also primary loads. The primary load of the aluminum electrolysis plant accounts for 95% of the total plant load. The electrolytic series current of the large aluminum industrial base is also developing in the direction of super large. The high load of the electrolytic aluminum plant has created a large burden on the power supply system of the power grid. At the same time, the electrolytic reaction in the production of electrolytic aluminum inevitably produces carbon dioxide and affects t...

AI Technical Summary

Problems solved by technology

[0003] Electrolytic aluminum currently has a power supply system that only supplies power to the grid, and the method is single. However, electrolytic cells in electrolytic aluminum are developing in the direction of large capacity, high current density, and high technology, and the electrolytic aluminum industry itself is a high energy-consuming industry. It will also have a greater impact on the peak-valley regulation of the power grid

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