Networking method for DC side network operation of dual power supply rectification system

Abstract

The invention discloses a direct-current side networking operation networking method for a double-power-source rectification system. The system comprises a power distribution unit for power supply of a power plant power source, a power distribution unit of a system power source, an alternating-current power source interconnection switch, a first rectifier unit, a second rectifier unit and voltage adjusting rectification transformer banks. The power distribution unit for power supply of the power plant power source is connected with the power distribution unit of the system power source through the alternating-current power source interconnection switch. The first rectifier unit and the second rectifier unit are composed of the multiple voltage adjusting rectification transformer banks, rectifiers and direct-current isolating switches. The first rectifier unit and the second rectifier unit are jointly connected with a direct-current busbar. Before an engine unit of a self-supply power plant is established, part of electrolysis direct-current loads are started through a power grid and serve as starting and test loads of the self-supply power plant, and therefore the problem that the engine unit of the self-supply power plant is difficult to start is solved.

Description

technical field [0001] The invention relates to a networking method for the DC side of a dual power supply rectification system to be connected to the network, and belongs to the technical field of the application of an aluminum-electricity combined power supply rectification device. Background technique [0002] Since the electrolytic aluminum smelter is a large power consumer, only one electrolytic aluminum production plant with an annual output of 400,000 tons needs about 720WM of electric energy, and the annual power consumption is about 56×10 8 kWh, so it is hoped that the electrolytic aluminum smelter will be built in a place with rich energy and reasonable electricity price. However, with the rising demand for electricity, it is difficult to provide enough capacity from the grid to electrolytic aluminum smelters, and the use of aluminum and power joint ventures has become a necessity. This means that it is necessary to build a dedicated or "affiliated" power plant cl...

AI Technical Summary

Problems solved by technology

However, if the electrolytic aluminum smelter is located in a remote location and the nearby power grid is very weak, the construction cost will be considerable if ultra-high voltage transmission is adopted. Therefore, in order to ensure the reliability of the isolated grid operation of the microgrid, it is necessary to use another power source as the aluminum electricity joint production system However, sometimes for some reason, it may not be allowed to connect in parallel in the AC test, in order to be able to economically and effectively use the weak grid to provide power for the aluminum-electricity joint production system, especially when the power plant has not yet generated power Before operation, it is necessary to start a part of the electrolytic aluminum load through the only weak power grid as the start-up and test load of the generator set. Therefore, it is necessary to study and discuss the design of a voltage-regulating rectifier transformer group that can apply to two voltage levels. The power supply rectification system is very necessary, and the present invention proposes a method for solving the above-mentioned problems

Images