Double-fed wind power system asymmetric high voltage fault ride-through control method

A technology of doubly-fed wind power and control method, which is applied in the field of fault ride-through control and doubly-fed wind power system, and can solve problems such as not considering the limitation of the maximum output capacity of the converter

Active Publication Date: 2016-09-21
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

However, the proposed control strategy does not consider the limitation of the capacity of the converter and the capacity of the DC bus voltage to output AC voltage on the maximum output capacity of the positive and negative sequence reactive currents on the stator side of the doubly-fed wind turbine.

Method used

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  • Double-fed wind power system asymmetric high voltage fault ride-through control method
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  • Double-fed wind power system asymmetric high voltage fault ride-through control method

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] Such as figure 1 As shown, the asymmetric high-voltage fault ride-through control method of the doubly-fed wind power system of the present invention includes the control objects: DC link capacitor 1, rotor-side converter 2, parallel-connected side converter 3, and space vector pulse width modulation module 4 , double-fed induction wind turbine 5, series grid-side converter 6, current sensor 7, voltage sensor 8, speed sensor 9, phase-locked loop (PLL) 10, rotor-side converter reactive current given value calculation module 11, The current reference value calculation module 12 of the parallel grid side converter, the power calculation module 13 of the series grid side converter, the constant power conversion module 14 from the forward synchronous angular velocity rotating coordinate axis system to the stationary two-phase αβ coo...

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Abstract

The invention discloses a double-fed wind power system asymmetric high voltage fault ride-through control method, being able to control serial grid-side converters, parallel grid-side converters and rotor-side converters respectively when a power grid voltage asymmetric surging fault occurs. The double-fed wind power system asymmetric high voltage fault ride-through control method realizes that when the power grid voltage asymmetric surging fault occurs, the voltage at the stator end of a double-fed wind power system maintains the same and restrains the stator linkage transient DC component, realizes the generator stator / rotor voltage and current balance, realizes no fluctuation of active or reactive power for system total output, realizes the control target of providing dynamic active support for a power grid voltage asymmetric surging fault power grid, can guarantee safe and stable operation of the double-fed wind power system, and can improve the electric energy quality of the power grid of the system.

Description

technical field [0001] The invention relates to a technical improvement of a doubly-fed wind power system, in particular to a fault ride-through control method for the system when an asymmetric sudden rise fault occurs in the grid voltage, and belongs to the technical field of electric power control. Background technique [0002] In the traditional doubly-fed wind power generation system, due to the small capacity of the grid-connected converter and the generator stator winding directly connected to the grid, the power generation system is extremely sensitive to grid faults. When a single-phase or two-phase ground fault or load sudden drop occurs in the power system, it may cause asymmetric grid voltage surge faults. During grid voltage asymmetric surge faults, the stator voltage of the generator will increase with the grid voltage. It may damage the insulation material of the stator winding and reduce the insulation level of the stator winding; at the same time, the transie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/16H02P9/10H02P101/15H02P21/12
CPCH02J3/16H02J3/386H02P9/102H02P21/12H02P2101/15H02P2207/07Y02E10/76Y02E40/30
Inventor 姚骏尹潇郭利莎曾欣谭义
Owner CHONGQING UNIV
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