Wind energy caching low voltage ride through and reactive supporting control method for double-feed draught fan

A low-voltage ride-through, doubly-fed fan technology, applied in reactive power compensation, AC network voltage adjustment, reactive power adjustment/elimination/compensation, etc. Industrial applications, etc., to achieve the effect of prolonging the time of staying on the network, increasing the burden, and delaying the acceleration of the rotor

Inactive Publication Date: 2014-11-19
NARI TECH CO LTD
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Problems solved by technology

However, such methods are usually complicated, subject to the negative impact of controller time lag on the tracking process (in extreme cases, the peak value of the fault current may be increased), and the reliability of the...

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  • Wind energy caching low voltage ride through and reactive supporting control method for double-feed draught fan
  • Wind energy caching low voltage ride through and reactive supporting control method for double-feed draught fan
  • Wind energy caching low voltage ride through and reactive supporting control method for double-feed draught fan

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Embodiment Construction

[0057] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0058] The method of the present invention is an improvement on the MPPT method. Under normal working conditions, the MPPT method is still used to control the double-fed fan system. The specific control loop can be seen figure 1 , figure 2 , image 3 .

[0059] When a power grid accident is detected, the control loop of the rotor-side converter is originally controlled by the measured value of the rotor speed ω r with its reference value ω r.ref The proportional integral value of the difference gives the electromagnetic torque reference value T e.ref Switch to give directly by expression (11), such as Figure 4 shown.

[0060] T e . ref = τ · U s U ...

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Abstract

The invention discloses a wind energy caching low voltage ride through and reactive supporting control method for a double-feed draught fan and belongs to the technical field of automatic control over wind driven generators. The purpose of reducing the currents of a rotor is achieved by switching electromagnetic torque reference values in a rotor side (RSC) control circuit under grid faults and temporarily storing surplus wind energy captured under the faults into rotor inertia energy. After the voltage recovers, a traditional circuit is switched back by an RSC, after the switch, overcurrent of the voltage recovery segment is avoided by temporarily limiting the electromagnetic torque of the RSC, and energy balance recovers safely. After a cascading feedback type reactive controller is applied, a fan can also provide reactive supporting safely for a grid in the whole low voltage ride through process. Compared with the prior art, the method is high in control strategy speed, new hardware is not introduced in, fault current in the fan can be effectively reduced, grid leaving time is prolonged, and nearby voltage can be obviously stabilized.

Description

technical field [0001] The invention belongs to the technical field of automatic control of wind power generators. More precisely, the invention relates to a low-voltage ride-through and reactive power support control method of a doubly-fed wind turbine for caching wind energy. Background technique [0002] Doubly-fed wind turbines (doubly-fed wind turbines) are widely used because of their high efficiency, variable speed operation, and independent control of active and reactive power. Under normal working conditions, the optimal wind energy capture control (MPPT) method with optimal wind energy capture as the control goal is widely used in the doubly-fed wind turbine control system, and its schematic diagram is as follows: figure 1 shown. [0003] The MPPT method applies a fifth-order dynamic model, and uses the state equation of formula (1) to describe the generator model: [0004] u ds ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/18H02J3/16H02J3/28
CPCY02E40/30
Inventor 谢东亮许昭薛禹胜杨黎晖
Owner NARI TECH CO LTD
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