Grid-connection feedback device of high-voltage inverter and control method of grid-connection feedback device

Abstract

The invention discloses a grid-connection feedback device of a high-voltage inverter. The grid-connection feedback device comprises an inlet switch, a high-voltage inverter, a control system, a grid-connection electric reactor and an outlet switch. The grid-connection feedback device is characterized in that the inlet switch is connected with an input end of the high-voltage inverter; an output end of the high-voltage inverter is connected with the grid-connection electric reactor, the electric reactor is connected with the outlet switch, the outlet switch and an output end of the inlet switch are connected with an input end of the high-voltage inverter; the control system of the high-voltage inverter samples a voltage of a power network and an output current of the high-voltage inverter, processes the voltage of the power network and the output current of the high-voltage inverter, controls the output pulse of the high-voltage inverter and feeds back energy to the power network. By utilizing the grid-connection feedback device, grid-connection of the high-voltage inverter and energy feedback to the power network are achieved, the purpose of aging a whole high-voltage inverter is achieved, and meanwhile, saving energy and reducing consumption can be achieved; the floor area is small, the operability is strong and the production efficiency is improved.

Description

technical field [0001] The invention relates to a high-voltage frequency converter aging experiment technology, and more specifically, relates to a high-voltage frequency converter grid-connected feedback device. Background technique [0002] With the development of power electronics technology, high-voltage frequency converters are widely used in electric power, metallurgy, petrochemical, tap water, coal and other fields, saving a lot of electric energy and creating considerable economic and social benefits. [0003] In order to ensure the reliability of the product, the high-voltage inverter must be subjected to the aging test of the whole machine before leaving the factory, that is, the high-voltage inverter works at the rated current for a period of time. In the high-voltage inverter industry, there are two main load modes for the aging of the whole machine: empty motor load and energy feedback load (such as attached figure 1 shown). The load of the empty motor is gene...

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Problems solved by technology

The energy feedback type load mainly refers to the high-voltage inverter driving the prime mover, which drives the generator to generate electricity, and will feed back the electric energy to the grid through the four-quadrant inverter; although this method feeds energy back to the grid, there are still motors, etc. Mechanical losses of rotating equipment

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