Method for improving wind power grid-connected primary frequency modulation performance by utilizing adaptive virtual parameters

A virtual parameter, self-adaptive technology, applied in the direction of wind power generation, electrical components, circuit devices, etc., can solve the problems of increasing response time, power oscillation suppression, affecting power oscillation suppression performance, etc., to achieve the problem of suppressing power oscillation, the value reasonable effect

Active Publication Date: 2020-11-27
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

However, the conventional virtual moment of inertia J is a fixed value. If the value of J is too small, the system response time can be reduced but cannot restrain the power oscillation; if the value of J is too l

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  • Method for improving wind power grid-connected primary frequency modulation performance by utilizing adaptive virtual parameters
  • Method for improving wind power grid-connected primary frequency modulation performance by utilizing adaptive virtual parameters
  • Method for improving wind power grid-connected primary frequency modulation performance by utilizing adaptive virtual parameters

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Embodiment Construction

[0045] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.

[0046]Such as figure 1 As shown, the wind power generation system controls the inverter by imitating the drooping characteristics of the synchronous generator in the conventional generating set. In the frequency response process of the wind power generation system, due to the existence of the dead zone of the inverter device, it is necessary to set the frequency response action threshold f d , usually f d =(50±0.1)Hz, when the droop control output frequency is 49.9Hz≤f≤50.1Hz, the droop control system will not act. According to the output characteristics of the inverter, the adjustment range of the output active power of the wind power generation system during a frequency regulation is: ±10%P 0 , where: P 0 is the initial value of the output power of the primary frequency modulation of the fan, according to figure 1 The P-f droop ...

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Abstract

The invention discloses a method for improving wind power grid-connected primary frequency modulation performance by using adaptive virtual parameters. The method comprises the steps of 1) establishing a wind power primary frequency modulation droop control mathematical model; 2) establishing a simulated synchronous generator mathematical model and a mechanical power mathematical model; 3) designing an adaptive virtual inertia and rotating speed difference control function; 4) designing an adaptive damping coefficient and rotating speed difference control function; 5) applying the adaptive virtual inertia and the adaptive damping coefficient to a virtual synchronous generator control system of the wind power generation grid-connected control system; 6) establishing a wind power generationoutput power mathematical expression; 7) solving a first-order derivative and a second-order derivative of the step 6); 8) obtaining a reference output power expression of a virtual synchronous machine; 9) calculating a characteristic root in the step 8); 10) obtaining the natural oscillation rotating speed and the damping ratio of the system; 11) calculating the rated virtual inertia value range;and 12) setting a rated damping coefficient on the basis of considering the damping coefficient. According to the invention, the wind power grid-connected primary frequency modulation performance isimproved.

Description

technical field [0001] The invention relates to a method for improving the primary frequency modulation performance of wind power grid-connected by using self-adaptive virtual parameters. For primary frequency modulation performance, the value range of rated virtual parameters is analyzed through the small signal model. Background technique [0002] In order to enable the wind power grid-connected system using doubly-fed asynchronous motors to have the ability to participate in the primary frequency regulation of the grid, it is necessary to adopt a droop control scheme in the wind power grid-connected control system, decouple active power and reactive power, and control active power output to respond dynamically Frequency fluctuates. Because there is no inertial link in the conventional droop control, it cannot suppress the power oscillation phenomenon caused by the frequency mutation during the primary frequency modulation process. [0003] The virtual synchronous machin...

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/24
CPCH02J3/381H02J3/48H02J3/241H02J2203/20H02J2300/28Y02E10/76
Inventor 冯仰敏杨沛豪王恩南赵勇汪德军孟秀俊孔繁新
Owner XIAN THERMAL POWER RES INST CO LTD
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