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

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...

AI Technical Summary

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 large, the system can restrain the power fluctuation but increase the response time. time

Similarly, the selection of the virtual damping coefficient D will also affect the power oscillation suppression performance

Images