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Doubly-fed wind power plant subsynchronous oscillation suppression method capable of adaptively capturing frequency points

A technology of synchronous oscillation and doubly-fed wind power, applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of weakening subsynchronous oscillation suppression ability and overshoot, and achieve the effect of avoiding the weakening of suppression effect and overshoot

Active Publication Date: 2021-01-05
XIAN THERMAL POWER RES INST CO LTD +1
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Problems solved by technology

However, since the operating state of the wind turbine will change with the change of wind speed, network parameters, etc., at this time, the traditional additional damping method weakens the subsynchronous oscillation suppression ability because it is difficult to obtain dynamic oscillation information, and even the However, an overshoot state occurs, and a new oscillation problem occurs

Method used

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  • Doubly-fed wind power plant subsynchronous oscillation suppression method capable of adaptively capturing frequency points
  • Doubly-fed wind power plant subsynchronous oscillation suppression method capable of adaptively capturing frequency points
  • Doubly-fed wind power plant subsynchronous oscillation suppression method capable of adaptively capturing frequency points

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Embodiment 1

[0073] The method of this embodiment is used to solve the subsynchronous oscillation problem of the actual double-fed wind farm grid-connected system.

[0074] In order to verify the correctness of the above analysis, a simulation platform such as Figure 4 The grid-connected model of the double-fed wind turbine shown is simulated and verified according to the following parameters:

[0075] 50Hz fundamental wave voltage amplitude: V 1 =690V; PI parameter of current inner loop: K p =0.6, K i =10; PLL control parameter: K pp =500,K pi =100; Rotor current reference value: I r,ref =7.635e j(1.3183) , rotor voltage reference value: U r,ref =3.575e j(-2.281) ; Shaft speed (per unit value): 0.8; box-type transformer reactance: 0.065p.u., transmission system inductance (after conversion): 0.63948H, transmission line series compensation degree is 40%.

[0076] In the initial state, the series capacitor of the transmission line is not used, and the series compensating capacitor...

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Abstract

The invention discloses a doubly-fed wind power plant subsynchronous oscillation suppression method capable of adaptively capturing frequency points, which comprises the following steps of: firstly, designing a subsynchronous oscillation additional damping ring; then, analyzing and tracking the oscillation frequency point at the grid-connected part of the target wind field by adopting real-time fast Fourier transform (FFT); performing self-adaptive adjustment of the additional damping ring based on the tracking frequency point; and finally, improving a rotor-side converter control strategy ofthe doubly-fed wind turbine generator by using the designed additional damping ring for adaptively capturing the frequency points. Compared with the same type of double-fed wind power plant subsynchronous oscillation suppression method, the method provided by the invention can accurately and effectively suppress the subsynchronous oscillation of the double-fed wind turbine generator, avoids the possible suppression effect weakening and overshoot caused by oscillation frequency point offset of the same type of method, and has important practical significance for the safe and stable operation ofthe double-fed wind turbine generator access system.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, relates to the field of stability control of a doubly-fed wind turbine grid-connected system, and in particular to a doubly-fed wind farm subsynchronous oscillation suppression method for self-adaptively capturing frequency points. 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 present, doubly-fed wind turbines have been widely used in the field of new energy power generation, and doubly-fed wind farms have become the main way to achieve large-scale development and utilization of wind energy. When doubly-fed wind farms are connected to the grid, the power transmission line series compensation technology is often used to shorten the electrical distance, improve the power transmissio...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/002H02J3/381H02J2300/28Y02E10/76
Inventor 舒进张涛都劲松杨俊马晋辉蒋成文燕振元牛瑞杰马瑞瑞王阳
Owner XIAN THERMAL POWER RES INST CO LTD
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