Actual Measurement and Analysis of Wind Power Plant Participating in Power Grid Fast Frequency Modulation Base on Droop Characteristic

With the further growth of region wind power penetration rate, conventional generators are replaced by plenty of renewable energy generating, results in continued decline of power grid rotational inertia. Consequently, the frequency characteristic of power grid is trending downward. So it is an urgent need to study implementation of renewable energy generating units to participate in grid frequency regulation. This paper proposed a setting strategy of stability control equipment and AGC of wind power plant base on droop characteristic, and picked a wind power plant with a typical capacity which contains 133 doubly-fed induction generators (DFIG). Combined with plant-side off-line validating test and frequency characteristics test of Northwest Power Grid in second half of 2016, the fast frequency response capability of the wind turbines was actually verified for the first time from the perspective of the entire wind farm. The result shows that the wind turbines can rapidly adjust the output tracking the power system frequency, and the improvement of the frequency characteristic is significant.

0. Introduction

With the further growth of region wind power penetration rate, some bigger issues emerged ^{[1 – 4]} . For instance, the intrinsic intermittence and fluctuation of wind energy leads to undulating of power output of wind farm. In the region of high wind power penetration rate, conventional generators are greatly replaced by renewable generators, which leading to continued declines of power grid rotational inertia.