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

A technology of current sensor and current conversion device, which is applied in the direction of circuit device, AC network circuit, output power conversion device, etc., and can solve problems such as energy loss, wind energy volatility, and restrictions on the large-scale development of renewable energy

CN105490553AActive Publication Date: 2016-04-13STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-04-13

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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.
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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...

Examples

Embodiment

[0041] A multi-level wind power conversion device without AC and DC current sensors in this embodiment, such as figure 1 As shown, the converter device is connected in series between the wind turbine and the grid, the grid-side controller 1, the MPPT controller 2, the first converter unit 3, the second converter unit 4, and the wave trap 5;

[0042] The first converter unit 3, the second converter unit 4 and the wave trap 5 are connected in series in sequence; the local terminal of the grid-side controller 1 is connected to the communication terminal of the MPPT controller 2, and the communication terminal of the grid-side controller 1 is connected to the MPPT The local end of the controller 2 is connected;

[0043] The control terminal of the grid-side controller 1 is connected to the controlled terminal of the second converter unit 4, and the control terminal of the MPPT controller 2 is connected to the controlled terminal of the first converter unit 3;

[0044] The output ...