Ultraharmonics and idle electric power compensation energy-saving device of active power grid

Abstract

The invention relates to the technical field of active intelligent filters, in particular to an ultraharmonics and idle electric power compensation energy-saving device of an active power grid. The device comprises a three-phase power grid source, a load power supply transformer, power utilization load, a power grid voltage and current detection device, a high-voltage grid connection device, a power compensation conversion device, a load voltage and current detection device, a system protection control device, a PWM inverter, and a DSP-FFT processing device. Compared with the prior art, ultraharmonics and idle electric power in the power grid are compensated with high precision and high speed, and stability and security of power grid quality are improved. And meanwhile, ultraharmonics and idle electric power are converted into active power to be sent back to the power grid, so electric energy is greatly saved. After ultraharmonics and idle electric power are compensated, noises and temperature of the transformer are lowered, and service life of the device can be prolonged. Compared with a passive filter and a subsection switching compensation device, the ultraharmonics and idle electric power compensation energy-saving device of the active power is small in size, high in compensation precision, and is applicable to various dynamic transient variable loads.

Description

technical field [0001] The invention relates to the technical field of active intelligent filters, in particular to an active grid high-order harmonic and reactive power compensation energy-saving device. Background technique [0002] With the development of the world's energy crisis, the development of new energy is an important proposition of world science, while saving existing energy is an important research topic in the current scientific community. Because it will take time to develop new energy sources, and saving existing energy sources is a top priority in the world at present. At present, iron and steel metal smelting and electrolytic aluminum smelting are the fields that consume the most electricity in the world, so energy conservation and emission reduction should start from the metal smelting field. In the field of iron and steel metallurgy in my country, high-frequency furnaces and electric arc furnaces are used for arc melting and electrolytic high-temperatur...

AI Technical Summary

Problems solved by technology

However, this method has low compensation accuracy and poor reliability.

[0005] In addition, the utility model patent with the patent number of 201020254744 proposes a hybrid active filter, which is characterized in that it includes a primary system part and a secondary system part, and the primary system part includes an active filter and a passive filter connected in series The active filter cannot withstand the fundamental wave voltage of the grid AC power supply, has low withstand voltage, and has a small device capacity, so it cannot be applied to high-voltage and large-capacity power systems

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