Multilevel wind power current transformation device without AC/DC current sensor

Abstract

The invention relates to a multilevel wind power current transformation device without an AC / DC current sensor, and belongs to the technical field of power generation, power transformation or power distribution. The current transformation device is connected in series between a wind power generator set and a power grid. The current transformation device comprises a network side controller, an MPPT controller, a first current transformation unit, a second current transformation unit and a trap filter. The first current transformation unit, the second current transformation unit and the trap filter are connected in series in turn, and each unit in the current transformation device is controlled to realize feedforward control through each controller so as to realize grid connection power generation of the wind power generator set. According to the current transformation device, the harmonic component possibly brought into the power grid by the wind power generator set in grid connection can be reduced so that possible harm of the harmonic component to the power grid can be indirectly eliminated.

Description

technical field [0001] The invention relates to a current conversion device without an AC and DC current sensor, and belongs to the technical field of power generation, power transformation or power distribution. Background technique [0002] Wind energy and solar energy are a huge amount of renewable energy. Under the encouragement of national policies, my country's renewable energy has developed rapidly. Among renewable energy sources, wind power development technology is the most mature and the development cost is the lowest. my country has planned to build dozens of wind power bases with one million kilowatts and nine ten million kilowatts. By the end of 2013, my country's installed capacity of wind power has taken the lead in the world, reaching 91,400 kilowatts. Due to cost and other reasons, my country's solar photovoltaic power generation started relatively late. With the reduction of the cost of photovoltaic power generation, it has developed rapidly in recent year...

AI Technical Summary

Problems solved by technology

[0003] However, wind power and solar photovoltaic power generation are a special kind of power, which have many characteristics different from conventional energy power generation. They have the characteristics of intermittent and volatility. Many aspects have brought new challenges. At the same time, these characteristics of wind power will also become a serious obstacle restricting the large-scale development of renewable energy.

[0004] Therefore, how to solve the intermittency and volatility of wind energy in actual use is a very important problem to be overcome in the process of promoting wind energy. The existing technology combines wind energy with large capacitors or super batteries to store and reuse them. There is energy loss in the process of energy conversion

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