A high-voltage and high-power wind power generation system and its control method

A technology of a wind power generation system and a control method, which is applied in the control of wind turbines, wind energy power generation, wind turbines, etc., can solve problems such as bulky volume and high cost.

Active Publication Date: 2018-08-03
HUNAN UNIV
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Problems solved by technology

In order to reduce the loss of the transmission line and improve the transmission efficiency of the transmission line, the voltage level of the line needs to be raised. Usually, a step-up transformer is added between the generator and the head end of the transmission line. Due to the existence of the step-up transformer, this traditional power generation The system is bulky and costly, so this paper proposes a multi-phase high-power wind power generation system

Method used

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  • A high-voltage and high-power wind power generation system and its control method
  • A high-voltage and high-power wind power generation system and its control method
  • A high-voltage and high-power wind power generation system and its control method

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Embodiment Construction

[0061] Below in conjunction with accompanying drawing, the patent of the present invention is further described.

[0062] figure 1 It is a topological structure diagram of a multi-phase high-power permanent magnet synchronous generator. The rotor of the multi-phase generator is coaxially connected with the wind turbine. The wind turbine converts the captured wind energy into mechanical energy and drives the multi-phase generator to generate electricity; the multi-phase generator The stator has 9n phase windings, each phase winding is marked as: A 1 , B 1 , C 1 , A 2 , B 2 , C 2 , A 3 , B 3 , C 3 ,...,A 3i+1 , B 3i+1 , C 3i+1 , A3i+2 , B 3i+2 , C 3i+2 , A 3i+3 , B 3i+3 , C 3i+3 ,...,A 3n , B 3n ,C 3n , i=0, 1,..., n-1; the phase difference of alternating current output by adjacent two-phase windings is 360° / (9n); every 3-phase winding A 3i+1 , B 3i+1 、C 3i+1 Form a set of three-phase AC windings, namely A 3i+1 , B 3i+1 、C 3i+1 The 3i+1 sets of three-pha...

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Abstract

The invention discloses a high-voltage and large-power wind power generation system and a control method thereof. The high-voltage and large-power wind power generation system comprises a multi-phase permanent-magnet direct-drive wind power generator, 3n three-phase full-control rectification bridges and an H-bridge cascaded multilevel inverter, wherein the multi-phase and large-power permanent-magnet direct-drive wind power generator is provided with 9n phase outputs, n is a positive integer, each three phases form a winding, the 9n phase outputs jointly form 3n windings, each winding is connected with a DC side of each sub-module of the H-bridge cascaded multilevel inverter after being converted by one of the three-phase full-control rectification bridges, and an AC output end of the H-bridge cascade multilevel inverter is connected with a three-phase power grid. The three-phase full-control rectification bridges employ maximum power tracking control to achieve the output of a unit power factor of the wind power generator; and the H-bridge cascaded multilevel inverter is used for achieving high-voltage access, and an AC side is directly connected with a 35kV alternating current. By the high-voltage and large-power wind power generation system, the low-voltage and large-power permanent-magnet direct-drive wind power generation system can be directly connected with a high-voltage power transmission system by a converter, a boost transformer is omitted, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of high-voltage and high-power electric power electronics, and in particular relates to a high-voltage and high-power wind power generation system and a control method thereof. Background technique [0002] Since the second industrial revolution, electric energy has been widely used all over the world and has become a secondary energy necessary for people's production and life. At present, the acquisition of electric energy mainly comes from the conversion of primary energy, including water energy (hydroelectric power), thermal energy ( Thermal power generation), atomic energy (nuclear power), wind energy (wind power generation) and light energy (solar power generation), etc., the release of primary energy causes the prime mover to drive the generator to rotate, thereby generating alternating current, and the electric energy is transmitted to the user end through a long-distance transmission line . In order...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02J3/38F03D7/02F03D9/25
CPCF03D7/02H02J3/386H02M5/4585Y02E10/72Y02E10/76
Inventor 荣飞李旺黄守道高剑罗德荣王辉
Owner HUNAN UNIV
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