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A device for improving low voltage ride through and its control method

A low-voltage ride-through and control method technology, which is applied in the field of wind power generation, can solve the problems that the low-voltage ride-through capability does not meet the standard requirements, and achieve the effects of avoiding shocks, protecting and maintaining

Inactive Publication Date: 2011-12-21
CREAT POREEN POWER ELECTRONICS
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] At present, mainstream wind turbines must provide a low-voltage ride-through test report issued by an authoritative department before entering the grid, and the low-voltage ride-through capability of some early wind turbines (especially with a capacity below 850kW) does not meet the standard requirements

Method used

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  • A device for improving low voltage ride through and its control method
  • A device for improving low voltage ride through and its control method
  • A device for improving low voltage ride through and its control method

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Embodiment Construction

[0037] The low-voltage ride-through improvement device and its control method of the present invention are described in detail below in conjunction with the drawings and embodiments.

[0038] Such as figure 1 As shown, the low voltage ride through device 101 disclosed in the present invention includes a controller 102, an incoming circuit breaker 103, an outgoing circuit breaker 104, a fast transfer switch 105, a bypass switch 106, an isolation circuit 107, an Energy-absorbing circuit 108 and a synchronous circuit 109 are promoted, and controller 102 is respectively connected with incoming circuit breaker 103, outgoing circuit breaker 104, quick transfer switch 105, bypass switch 106, energy-absorbing circuit 108 and promoted synchronous circuit 109, and incoming line The circuit breaker 103, the isolation circuit 107 and the outlet circuit breaker 104 are sequentially connected in series between the fan and the power grid, the quick transfer switch 105 is connected in paralle...

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Abstract

The invention belongs to the technical field of wind power generation, and relates to a low-voltage ride-through improvement device and a control method thereof. The device includes a controller, an incoming line circuit breaker, an outgoing line circuit breaker, a fast transfer switch, a bypass switch, an isolation circuit, an energy absorption circuit and a synchronous circuit. When low voltage ride-through occurs, the device The control method consumes the active power generated by the fan through the energy absorption circuit, and synchronizes the voltage of the fan and the grid through the synchronous circuit. The invention makes it possible for the wind turbine not to be disconnected from the power grid when the low-voltage ride-through occurs, and to maintain uninterrupted grid-connected operation, so as to realize the protection of the wind power generating set equipment and maintain the stability of the power grid.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and relates to a low-voltage ride-through improvement device and a control method thereof. Background technique [0002] With the rapid development of wind power generation in recent years, with the continuous expansion of wind power installed capacity, the impact of wind power system on the power grid is also increasing. The low voltage ride through problem of wind turbines is the most important problem when the voltage drop occurs in the power grid, and it is also one of the problems that have the greatest impact on the power grid. When a voltage drop occurs in the power grid, if the low-voltage ride-through capability of the wind turbines is not up to standard, a large number of wind turbine shutdown accidents will occur, which will cause a large change in the power flow of the system, and even cause large-scale power outages. For this reason, the State Grid Corporation of China...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 张皎齐泽锋郭高朋
Owner CREAT POREEN POWER ELECTRONICS
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