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Low-voltage failure crossing method of brushless cascading double-fed wind power generator set

A low-voltage fault, doubly-fed motor technology, applied in the direction of control of generators, electrical components, reactive power compensation, etc., can solve the problem of the absence of brushless cascaded doubly-fed wind motors and limit the application of brushless cascaded doubly-fed motors, etc. problems, to achieve the effect of improving controllability and dynamic performance, and improving reliability

Inactive Publication Date: 2011-01-12
邵诗逸
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  • Application Information

AI Technical Summary

Problems solved by technology

The existing fault ride-through technology mainly considers the traditional motor topology, but the low-voltage fault ride-through scheme for brushless cascaded doubly-fed wind turbines has not appeared, which limits the application of brushless cascaded doubly-fed motors in actual wind power generation. application in

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  • Low-voltage failure crossing method of brushless cascading double-fed wind power generator set
  • Low-voltage failure crossing method of brushless cascading double-fed wind power generator set
  • Low-voltage failure crossing method of brushless cascading double-fed wind power generator set

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Embodiment Construction

[0022] The vector control method and principle of the brushless cascade double-fed motor are briefly described as follows:

[0023] figure 1 It is the schematic diagram of the brushless cascaded doubly-fed motor. The brushless cascaded double-fed motor has two sets of stator windings, which are power windings and control windings. The power winding is directly connected to the grid with a fixed frequency of 50Hz, while the control winding is connected to the grid through a bidirectional converter. The speed of the motor can be controlled by adjusting the frequency of the control winding. If the working range of the motor can be limited, most of the energy flows into or out of the motor through the power winding, while a small part of the energy flows into or out of the motor through the converter, so the capacity of the converter can be reduced, generally 1 of the motor capacity / 3, and can greatly reduce the loss of the converter. In a traditional doubly-fed motor, only o...

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Abstract

The invention provides a low-voltage failure crossing method of a brushless cascading double-fed wind power generator set, comprising a crowbar circuit (controlling a winding from short-circuit to protect the circuit) controlling a winding AC side and a charge leakage circuit which is back to back of a DC side of a current transformer; the crowbar circuit ensures to release the residual energy incapable of being input into an electricity grid when the electricity grid has a low-voltage failure, and can control a winding end to limit the voltage and the current; the charge leakage circuit ensures the voltage of the DC side to be stable under any condition, and also ensures to release the residual active power at the DC end, thereby protecting the hardware. In a low-voltage failure, the current transformer of the electricity grid end simultaneously inputs reactive power to the electricity grid, thereby satisfying the low-voltage crossing standard and providing assistance for recovering the electricity grid to be normal.

Description

Technical field: [0001] The invention relates to a low-voltage fault ride-through method for a special motor applied in a wind power generation system, which can realize the continuous operation of the brushless cascaded doubly-fed wind power generator at low voltage, and release the excess active power so that it does not flow into the wind power generation system. The power grid limits the voltage and current at the control winding end, maintains the stability of the DC end of the converter, and sends reactive power to the grid to meet the fault ride-through standard at low voltage. Background technique: [0002] Doubly-fed motors are widely used in the field of wind power generation, and once occupied more than 50% of the market share due to their advantages in cost and volume. However, in recent years, due to their disadvantages in maintenance and low-voltage ride-through, the market share has declined. . [0003] As an improved version of the doubly-fed motor, the brus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/18H02P9/10
CPCY02E40/30
Inventor 邵诗逸乌云翔
Owner 邵诗逸
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