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Direct-drive fan subsynchronous oscillation electrical quantity analysis method considering frequency coupling effect

A technology of coupling effect and analysis method, applied in the field of electric quantity analysis of subsynchronous oscillation of direct-drive fans

Active Publication Date: 2020-01-10
XIAN THERMAL POWER RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the proportion of direct-drive wind turbines in wind turbine types is also increasing year by year, and their connection to the grid brings a new challenge of subsynchronous oscillation

Method used

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  • Direct-drive fan subsynchronous oscillation electrical quantity analysis method considering frequency coupling effect
  • Direct-drive fan subsynchronous oscillation electrical quantity analysis method considering frequency coupling effect
  • Direct-drive fan subsynchronous oscillation electrical quantity analysis method considering frequency coupling effect

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Embodiment

[0093] In order to verify the correctness of the above formula, simulation verification was carried out according to the following parameters: 50Hz fundamental wave voltage amplitude V 1 =566V, disturbance voltage: Disturbance frequency: 20Hz, current inner loop PI parameter: K p =0.25, K i =355; PLL control parameters: K p =0.085, K i =32; current reference value: I dref =1847,I qref = 0; Inverter outlet filter inductance parameter L = 0.15e-3H.

[0094] Substituting the parameters into formula (14), the 20Hz output current with the same frequency as the disturbance voltage can be calculated as:

[0095] I p =45∠2.75 A (17)

[0096] According to formula (16), the output current with a coupling frequency of 80 Hz can be calculated as:

[0097] I p2 =0.7754×45∠(3.063-2.75)=35∠0.256 A (18)

[0098] Simulation results such as image 3 As shown, when there is a disturbance voltage of 20 Hz at the grid-connected point of the wind turbine, it can be seen that in additio...

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Abstract

The invention discloses a direct-drive fan subsynchronous oscillation electrical quantity analysis method considering a frequency coupling effect. The method comprises the steps: firstly, inputting adirect-drive fan parameter to be analyzed, and building a direct-drive fan simplified model; secondly, establishing an external impedance analytical model of a direct-driven fan based on a harmonic linearization method, wherein the establishment process is mainly characterized in that the frequency coupling effect of output harmonic current of the direct-driven fan under single-frequency harmonicvoltage disturbance is considered; and then, applying a single-frequency fp disturbance harmonic voltage to a grid-connected point of the direct-driven fan, calculating fp and 2f1-fp harmonic components in output current, giving an analytical expression of an output current frequency coupling relation, and comprehensively analyzing subsynchronous oscillation response characteristics of the direct-driven fan. The method quantitatively reveals a subsynchronous oscillation electrical quantity coupling response mechanism of the direct-drive fan under harmonic voltage disturbance, and the quantitative relation among the three can be provided only by inputting the parameters of the direct-drive fan.

Description

technical field [0001] The invention belongs to the field of power systems, relates to the field of stability analysis of a direct-drive fan, in particular to a method for analyzing the electrical quantity of a sub-synchronous oscillation of a direct-drive fan in consideration of frequency coupling effects. Background technique [0002] The proportion of new energy power access systems is gradually increasing, which brings new challenges to the safe and stable operation of power systems, including stability issues such as subsynchronous oscillations. At the same time, the proportion of direct-drive wind turbines in wind turbine types is also increasing year by year, and their connection to the grid brings a new challenge of subsynchronous oscillation. Under the premise that the back-to-back dual PWM converters isolate the machine-grid side and send it out without series compensation, subsynchronous oscillation still occurs after the direct-drive wind turbine is connected to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 舒进袁赛军都劲松杨俊牛坤蒋昊马晋辉蒋成文燕振元乔越
Owner XIAN THERMAL POWER RES INST CO LTD
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