Transformer free inductance energy-storing topological structure

Abstract

The invention relates to a transformer free inductance energy-storing topological structure which comprises three phases, wherein each phase is formed by serially connecting sub units consisting of a plurality of H bridge power modules and an inductance energy-storing module and accessed to a power grid through a buffer inductance; the inductance energy-storing module comprises a superconducting coil Lc, a switching element IGBT5 (Insulated Gate Bipolar Transistor), a switching element IGBT6, a diode D1 and a diode D2; the superconducting coil Lc and the diode D1 and the switching element IGBT5 form an energy-storing loop; the superconducting coil Lc and the diode D2 and the switching element IGBT6 form an energy-storing loop; and the inductance energy-storing module is connected in parallel with a capacitor C. The topological structure is connected in parallel to the power grid, and the input end of the topological structure is not provided with a transformer, thus the invention has the advantages of small volume, light weight and low cost, can inhibit power pollution of the power grid, can compensate instability of photovoltaic or wind energy power generation, provides a continuous, clean, stable and high-quality sine wave voltage without frequency discontinuity for loads on the power grid, and has the characteristics of high conversion efficiency and high response speed.

Description

technical field [0001] The invention relates to a transformerless inductive energy storage topology, which can be used in the field of high-voltage power systems, so that the grid can supply loads with reliable and high-quality voltage. Background technique [0002] At present, there are at least the following nine problems in the power grid: power failure, lightning spike, surge, frequency oscillation, voltage mutation, voltage fluctuation, frequency drift, voltage drop, pulse interference, etc. The electric energy generated by renewable energy such as photovoltaic or wind energy is also extremely unstable. The larger the scale of new energy grid-connected applications, the less secure the grid will be. According to the practice of grid-connected wind power plants at home and abroad, new The balanced output of energy generation power enables large-scale wind power and solar power to be easily and reliably integrated into the conventional grid. [0003] At present, power en...

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Problems solved by technology

[0003] At present, power energy storage equipment is connected in parallel with the power grid through a transformer. The use of a transformer makes the equipment a large investment, occupies a large area, high cost, and a long production cycle.

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