CN-121111583-B - Method and device for judging optimal position of net-structured double-fed fan shafting damping controller

CN121111583BCN 121111583 BCN121111583 BCN 121111583BCN-121111583-B

Abstract

The invention discloses a method and a device for judging the optimal position of a damping controller of a net-structured double-fed fan shafting, which adopts a damping controller based on a rotating speed signal, the damping controllers are added to different control links, and the differences of the damping of the axles added to different control loops are compared according to the root locus diagram of the net-structured double-fed fans. The results show that implementing a damping controller on the active loop reduces driveline damping compared to the voltage loop. Further, a better damping enhancement effect can be obtained with the q-axis voltage than with the d-axis voltage implementation of the damping controller.

Inventors

Nian Hang
HUANG XUDONG
ZHAO ZHIJIAN
HU BIN
ZHANG ZHENXIAO
HE ZHEN
CHEN ZHENGANG

Assignees

浙江大学
运达能源科技集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20251023

Claims (7)

1. The method for judging the optimal position of the shafting damping controller of the net-structured double-fed fan is characterized by comprising the following steps of: A damping controller based on a rotating speed signal is adopted and is respectively added on an active ring and a voltage ring of the net-structured double-fed fan; calculating shafting torsional vibration modes of the net-structured double-fed fan according to mechanical parameters of the wind turbine and the motor; obtaining a corresponding characteristic value by calculating a characteristic equation of the net-structured double-fed fan, extracting the characteristic value corresponding to the torsional vibration mode of the shafting, and then drawing a characteristic value locus diagram by setting different short circuit ratios; the stability analysis is carried out on the net-structured double-fed fans which adopt the damping controllers on the power loop through the root locus diagram, so that the damping of the transmission system can be reduced when the damping controllers are implemented on the active loop; Carrying out stability analysis on a grid-structured double-fed fan which adopts a damping controller on a voltage ring through a root locus diagram to obtain that the damping of a transmission system can be improved when the damping controller is implemented on the voltage ring; And (3) comparing and analyzing to implement the damping controllers on the d axis and the q axis of the voltage ring, and finally obtaining the optimal damping enhancement effect of applying the damping controllers on the q axis.
2. The method of claim 1, wherein the rotational speed signal based damping controller is as follows: ; Wherein G d represents a damping controller, K d represents a gain of the damping controller, s represents a Laplacian operator, and T ω represents a blocking link time constant.
3. The method of claim 1, wherein the shafting torsional mode of the grid-built doubly-fed wind machine is calculated by: ; Wherein f osc is shafting torsional vibration mode, pi is circumference rate, K m is mechanical rigidity coefficient, H t 、H g is equivalent wind wheel inertia and equivalent motor inertia respectively, and omega 1 is power frequency angular frequency.
4. The method of claim 1, wherein the characteristic equation is as follows: ; Wherein lambda is a characteristic value, D is virtual damping, J is virtual inertia, omega b is power frequency angular frequency, and G(s) is a comprehensive influence effect of short circuit comparison characteristic value under a damping controller.
5. The utility model provides a net formula doubly-fed fan shafting damping controller optimal position decision device which characterized in that includes: the adding module is used for adopting a damping controller based on a rotating speed signal and respectively adding the damping controller to an active ring and a voltage ring of the grid-built double-fed fan; the calculation module is used for calculating the shafting torsional vibration mode of the net-structured double-fed fan according to the mechanical parameters of the wind turbine and the motor; the drawing module is used for obtaining the corresponding characteristic value through calculating the characteristic equation of the net-structured double-fed fan, extracting the characteristic value corresponding to the torsional vibration mode of the shafting, and then drawing the characteristic value root locus diagram through setting different short circuit ratios; The first analysis module is used for carrying out stability analysis on a grid-structured double-fed fan which adopts a damping controller on a power loop through a root locus diagram, so as to obtain that damping of a transmission system can be reduced when the damping controller is implemented on an active loop; The second analysis module is used for carrying out stability analysis on the grid-structured double-fed fan which adopts the damping controller on the voltage ring through a root locus diagram, so that damping of the transmission system can be improved when the damping controller is implemented on the voltage ring; And the optimal position determining module is used for comparing and analyzing the damping controllers applied to the d axis and the q axis of the voltage ring, and finally obtaining the optimal damping enhancement effect which can be achieved by applying the damping controllers to the q axis.
6. An electronic device, comprising: One or more processors; A memory for storing one or more programs; The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of any of claims 1-4.
7. A computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the steps of the method according to any of claims 1-4.

Description

Method and device for judging optimal position of net-structured double-fed fan shafting damping controller Technical Field The application relates to the technical field of wind power generation control, in particular to a method and a device for judging the optimal position of a shafting damping controller of a net-structured double-fed fan. Background With the increasing energy crisis and environmental pollution, the installed capacity of the global wind power generation system continues to increase. The doubly-fed induction generator-based wind power generation system is widely applied in practical application due to the advantages of small converter capacity, low cost, flexible power adjustment and the like. There is an electromechanical interaction between the electrical and mechanical systems of the doubly fed wind turbine, so its stable operation requires coordinated control of the current transformer and the wind turbine master. When being disturbed by the outside, the interaction can excite the inherent torsional vibration mode of the doubly-fed wind turbine, so that shafting torsional vibration is generated, fatigue load can be generated on components of the transmission system by the torsional vibration, the maintenance cost can be increased, the shaft can be broken, and the wind turbine generator set is seriously damaged. When the doubly-fed fan adopts a network control strategy, the electromechanical interaction effect is further enhanced, and the risk of shafting torsional vibration is increased. At present, the study on the shafting torsional vibration problem of the net-structured double-fed fan at home and abroad is carried out, namely 1) the time domain simulation shows that the net-structured control causes the double-fed fan to generate shafting torsional vibration more easily than the net-structured control. 2) The modeling indicates that the virtual inertia and the virtual damping coefficient are key parameters affecting the instantaneous torque, and 3) when the control bandwidth of the network is smaller than the torsional vibration frequency of the transmission system, the risk of generating shafting torsional vibration is increased In summary, the above researches only analyze the torsional vibration characteristics of the grid-built double-fed fan, and do not carry out in-depth researches on the suppression strategy of the torsional vibration of the shafting of the grid-built double-fed fan, and because the power loop bandwidth and the voltage loop bandwidth of the grid-built double-fed fan are similar, the position of the added damping controller is more flexible than that of the grid-built double-fed fan, and the optimal position of the damping controller is needed to be judged urgently, so that the shafting damping of the wind turbine generator is effectively improved. Disclosure of Invention In view of the above, the invention provides a method and a device for judging the optimal position of a shafting damping controller of a grid-structured double-fed fan, which are used for providing a reference for improving the grid-connected stability of the grid-structured double-fed fan by adding damping controllers on different control loops and selecting the optimal position of the damping controllers. According to a first aspect of an embodiment of the present application, there is provided a method for determining an optimal position of a shafting damping controller of a grid-structured doubly-fed fan, including: A damping controller based on a rotating speed signal is adopted and is respectively added on an active ring and a voltage ring of the net-structured double-fed fan; calculating shafting torsional vibration modes of the net-structured double-fed fan according to mechanical parameters of the wind turbine and the motor; obtaining a corresponding characteristic value by calculating a characteristic equation of the net-structured double-fed fan, extracting the characteristic value corresponding to the torsional vibration mode of the shafting, and then drawing a characteristic value locus diagram by setting different short circuit ratios; the stability analysis is carried out on the net-structured double-fed fans which adopt the damping controllers on the power loop through the root locus diagram, so that the damping of the transmission system can be reduced when the damping controllers are implemented on the active loop; Carrying out stability analysis on a grid-structured double-fed fan which adopts a damping controller on a voltage ring through a root locus diagram to obtain that the damping of a transmission system can be improved when the damping controller is implemented on the voltage ring; And (3) comparing and analyzing to implement the damping controllers on the d axis and the q axis of the voltage ring, and finally obtaining the optimal damping enhancement effect of applying the damping controllers on the q axis. According to a second aspect of the embodiment of the