Dual-feeding motor system having protecting device and protecting method thereof

A double-fed generator and protection device technology, applied in emergency protection circuit devices, control generators, control systems, etc., can solve the problems of weak overload capacity, weak fault ride-through ability, and high cost, and achieve simple control and strong fault ride-through. Ability, low cost effect

Inactive Publication Date: 2009-03-11
EMERSON NETWORK POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the selected electronic switch in this scheme is controlled by pulse width modulation and is actively turned off. Due to the weak overload capacity of the active switch-off electronic switch, it usually requires multiple tubes to be connected in parallel, and current sharing will occur when the rotor winding is short-circuited. and overcurrent problems
For severe grid faults, this solution will cause the generator stator to go off-grid due to rotor overvoltage, so the cost of this solution is high, the control is complicated, and the fault ride-through capability is weak

Method used

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  • Dual-feeding motor system having protecting device and protecting method thereof
  • Dual-feeding motor system having protecting device and protecting method thereof
  • Dual-feeding motor system having protecting device and protecting method thereof

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0035] Such as figure 1 A doubly-fed generator system with a protection device shown in the present invention includes: a doubly-fed induction generator 100, a rotor-side converter 130, an intermediate DC side 110, a DC bus discharge circuit 140, and a grid-side converter 120 , the rotor 102 of the doubly-fed induction generator 100, the rotor-side converter 130, the intermediate DC side 110, and the grid-side converter 120 are sequentially connected to the power grid, and the bypass protection circuit 200, the bypass protection circuit 200 Connected to the rotor 102 , when the voltage of the intermediate direct current side 110 exceeds a set threshold U2 , the bypass protection circuit 200 is turned on to bypass the current on the rotor 102 .

[0036] The DC bus discharge circuit 140 (Chopper) includes a full-control switching tube V13 using...

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Abstract

The invention discloses a doubly fed generator system with a protector, as well as a method used for protecting the system. The doubly fed generator system with the protector comprises a doubly fed induction generator (100), a rotor side converter (130), an intermediate DC side converter (110), a grid side converter (120) and a bypass protecting circuit (200), wherein the bypass protecting circuit (200) comprises current limiting resistors (R1, R2 and R3) and thyristors (Q1, Q2, Q3, Q4, Q5 and Q6), the thyristors are divided into three groups, each group comprises two thyristors reversely connected in parallel, and is connected with one current limiting resistor in series, and the three groups of thyristors are connected into a star shape; when the voltage of the intermediate DC side converter (110) exceeds the set threshold U2, the thyristors (Q1, Q2, Q3, Q4, Q5 and Q6) are triggered to be conducted. The invention has the advantages of low cost, simple control and stronger fault ride-through capacity.

Description

technical field [0001] The invention relates to a doubly-fed generator system and its protection method, in particular to a doubly-fed generator system with a protection device and its protection method when a grid fault occurs. Background technique [0002] Under grid failure, a large number of generators (such as: wind turbines) disconnected from the grid will cause power loss in the grid and aggravate the collapse of the grid. In order to meet the safety requirements of the power grid, it is required that the generator system (such as: a wind turbine generator system) must have the fault ride-through capability of uninterrupted operation in the case of a grid fault. [0003] Existing doubly-fed generator systems include doubly-fed induction generators (DFIG) and back-to-back converters. The stator winding of a doubly-fed induction generator (DFIG) is generally connected to the grid through a grid-tie switch to a transformer, and the rotor winding is connected to a back-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02H7/06
Inventor 吕怀明
Owner EMERSON NETWORK POWER CO LTD
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