220 kilovolt grade low-voltage winding split on-load voltage-regulating wind power transformer

Abstract

The invention discloses a 220 kilovolt grade low-voltage winding split on-load voltage-regulating wind power transformer comprising an iron core, a first low-voltage coil, a high-voltage regulating coil, a high-voltage coil and a second low-voltage coil, wherein the iron core, the first low-voltage coil, the high-voltage regulating coil, the high-voltage coil and the second low-voltage coil are sequentially arrayed from inside to outside; the first low-voltage coil and the second low-voltage coil are two branches of a low-voltage split winding; and a grounded shield is arranged in a main insulation gap between the high-voltage coil and the second low-voltage coil arranged at the outside. When applied to a wind power station which transmits power outwards and has an improved wiring mode, the invention can effectively enhance the integral low-voltage ride through capacity of a voltage-raising transmission system of a wind power station and has very high lightning strike resistant capacity.

Description

technical field [0001] The invention belongs to the field of transformers, and in particular relates to a 220-kilovolt low-voltage winding split-type on-load voltage-regulating wind power transformer. Background technique [0002] New energy development and energy crisis are two hot issues in the current energy field. [0003] From the source of energy, people compare traditional fossil energy to "yesterday's sunshine", while new energy is "today's sunshine", which shows people's enthusiasm for new energy. At present, due to the high cost of solar power generation, the limitations of biomass energy, and the limitations of geothermal energy and tidal energy, wind power is the most favored in comparison. [0004] There are three operation modes of wind power generation: one is independent operation mode, usually a small wind power generator provides power to one or several households, and it uses battery storage to ensure power consumption when there is no wind; Combining ot...

AI Technical Summary

Problems solved by technology

Therefore, if the above short-circuit situation occurs, for a common 220 kV double-turn on-load step-up transformer that receives power from a single circuit, the transformer may be cut off, which will cause large local voltage fluctuations. Affects the power quality of the grid

[0014] At the same time, due to the capacitive coupling effect between the high-voltage and low-voltage coils of the transformer, when the 220 kV line terminal is subjected to a lightning strike, the overvoltage will induce a shifting voltage on the adjacent low-voltage coil. It is likely to exceed the normal insulation level of the low-voltage coil, and this shifting voltage will be transmitted to the next-level wind power collector transformer through the low-voltage outgoing line and may damage its insulation in severe cases

[0015] The above factors all reduce the stability of the wind farm's power transmission

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