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High-power converter circuit topology for offshore wind power

A technology for offshore wind power and converters, which is applied to AC network circuits, wind power generation, circuit devices, etc., can solve the problems of cost, technical realization, efficiency and reliability of offshore converters, and achieve low cost, high torque The effect of cable risk reduction and output current reduction

Pending Publication Date: 2019-08-13
浙江日风电气股份有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the cost, technical realization, efficiency and reliability of the offshore converter cannot be balanced, and to provide a high-power converter circuit topology for offshore wind power

Method used

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  • High-power converter circuit topology for offshore wind power

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Embodiment

[0018] A high-power converter circuit topology for offshore wind power, including generator G1, box transformer T1 and 4 sets of converter units with the same structure, converter unit 1-converter unit 4, such as figure 1 As shown, 4 groups of converter units are connected in parallel. The stator of the generator G1 contains 4 windings, and each winding is connected to a converter unit respectively. The 4 converter units are connected in parallel to each other and connected to the box transformer T1. The generator G1 passes through 4 parallel converters The unit feeds electrical energy into the grid. The advantage of this connection method is that each converter unit can work independently, especially in the case of a fault, the converter unit can work under load reduction, improve utilization, and reduce loss of power generation.

[0019] The converter unit 1 includes a generator-side converter module and a grid-side converter module, and the input terminal of the generator-...

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Abstract

The invention relates to a high-power converter circuit topology for offshore wind power. The high-power converter circuit topology comprises a generator, a box transformer and a plurality of converter units. Each converter unit comprises a machine-side converter module and a network-side converter module, wherein the machine-side converter module and the network-side converter module both adopt aneutral-point clamping type three-level topological structure. The plurality of groups of converter units are connected in parallel, wherein the input end of each group of converter units is connected with one winding of a generator stator, and the output end of each group of converter units is connected with a box transformer. The output power of the generator is matched with the group number ofthe input converter units, and the start-stop logic and adjustment power distribution are realized through a power cooperation mode. According to the converter circuit topology, the start-stop logicand power distribution are achieved in the power cooperation mode, the number of groups of the input converter units is determined according to the power output by a generator, and each converter unitcan work independently, and particularly under the fault condition, the converter units can work in a load shedding mode, so the utilization rate is increased, and the power generation loss is reduced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a high-power converter circuit topology for offshore wind power. Background technique [0002] At present, offshore wind power has become a research hotspot in the development of global wind power. All countries in the world regard offshore wind power as an important direction for the development of renewable energy, and my country has also included it as an important part of strategic emerging industries. Different from the construction of onshore wind farms, due to the difficulty of offshore wind farm construction and the high cost of infrastructure construction, wind turbine equipment only accounts for about 40% of the total cost of wind farm construction, while other costs such as offshore construction, hoisting, maintenance, and submarine cables account for 60% Therefore, offshore wind turbines with higher power and high reliability have a relatively low constr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386Y02E10/76
Inventor 吕怀明
Owner 浙江日风电气股份有限公司
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