Improved Adaptive Inertia and Damping Coefficient Control Strategy of VSG Based on Optimal Damping Ratio
Qingyi Wang, Dan Zhou, Shuai Yin, Yudi Lei, Tao He
Abstract
Although virtual synchronous generator (VSG) can deal the problem of the lack of inertia and damping in new energy grid-connected power generation system, the link between inertia and damping hasn't been established in the current control technique. Aiming at this problem, a coordinated adaptive control method for the moment of inertia <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$J$</tex> and the damping coefficient <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{D}$</tex> of VSG is proposed in this paper. Firstly, the basic structure of VSG is introduced and the influences of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{J}$</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{D}$</tex> on the system are analyzed. Then, the selection rules of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{J}$</tex> are obtained according to the analysis of the power angle curve and the function of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{D}$</tex> associated with <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{J}$</tex> is determined under the condition of considering the damping ratio of system. Finally, simulation results show the effectiveness of the proposed method.