Double-fed fan multi-loop switching control system based on logic switch control

A doubly-fed fan and control loop technology, applied in control systems, vector control systems, control generators, etc., can solve problems such as complex Hamiltonian functions

Active Publication Date: 2016-05-18
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to establish a Hamiltonian function of a large-scale power system, it is necessary to know the parameters of the entire system and all state variables, and the obtained Hamiltonian function will be very complicated
This poses a great challenge to solve its regular equation

Method used

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  • Double-fed fan multi-loop switching control system based on logic switch control
  • Double-fed fan multi-loop switching control system based on logic switch control
  • Double-fed fan multi-loop switching control system based on logic switch control

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Experimental program
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Embodiment

[0064] See figure 1 with figure 2 , figure 1 It is a structural schematic diagram and composition block diagram of a double-fed fan multi-circuit switching control system based on logic switch control. It includes 8 control loops, which are: rotor speed control loop of double-fed fan based on traditional vector control method, rotor speed switch control loop of double-fed fan based on second-order logic switch controller, stator of double-fed fan based on traditional vector control method Reactive power control loop, DFIG stator reactive power control loop based on first-order logic switch controller, DFIG converter capacitor voltage control loop based on traditional vector control method, dual-fed wind turbine converter based on second-order logic switch controller Capacitance and voltage control loop of wind turbine converter, reactive power control loop of grid-side converter of double-fed wind turbine based on traditional vector control method, reactive power control of...

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Abstract

The invention provides a double-fed fan multi-loop switching control system based on logic switch control. A generator rotor rotating speed, stator side reactive power output, power grid side transverter reactive power output and a back-to-back transverter direct-current capacitor end voltage are selected as output variables of a double-fed fan. The four output variables form four output feedback control channel, each control channel is switched between a switch controller and a routine vector controller, and a four-loop switching controller is further formed. According to the switching strategy, when the electric power system of the double-fed fan receives a large external disturbance, state variables and output variables of the fan deviate from original balance points, and then the four control loops of the fan are respectively switched from the routine vector controller to the switch controller; and under the effect of the switch controller, the state variables and output variables of the fan return to the positions near the original balance points, and then the four control loops of the fan are respectively switched from the switch controller to the routine vector controller.

Description

technical field [0001] The invention relates to the technical field of electric power system automation, in particular to a multi-circuit switching control system of a doubly-fed fan based on logic switch control. Background technique [0002] With the large-scale development of renewable energy, the proportion of wind power in the power system is getting higher and higher, which brings new challenges to the transient stability control of traditional power systems. In particular, the occurrence of major faults with a small probability puts forward higher requirements on the low voltage ride-through capability of wind turbines. Doubly-fed induction wind turbines occupy a considerable proportion in current wind power generation. The traditional vector control algorithm of DFIG is based on the stator flux linkage or stator voltage coordinate system to decouple the active and reactive power control loops, and uses PI control to realize the maximum power tracking and active and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386H02J3/002H02J3/46H02P2101/15H02P21/50H02J3/50H02P9/007H02J2300/28H02J3/381Y02E10/76H02J3/38Y02E40/30H02J3/18H02P9/02
Inventor 吴青华刘洋
Owner SOUTH CHINA UNIV OF TECH
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