具有惯量特性的并网逆变器黑箱模型辨识

针对具有惯量特性的并网逆变器,提出了一种统一虚拟同步发电机(VSG)模型和基于智能算法的惯量阻尼参数辨识方法,实现了对未知模型的商业化并网逆变器装置的数学建模和惯量评估.基于将具有惯量特性的并网逆变器装置等值为一台VSG的思想,总结了现有各种VSG的实现方法,归纳出一种包含锁相环和动稳态阻尼特性的统一VSG模型;利用遗...

Identification of black box model of grid-connected inverter with inertia characteristics

Aiming at the grid-connected inverter with inertia characteristics, a unified virtual synchronous generator(VSG) model and an inertia damping parameter identification method based on intelligent algorithms are proposed, whichrealizes the mathematical modeling and inertia evaluation of the commercial grid-connected inverter device of unknownmodel. Based on the idea that the grid-connected inverter device with inertia characteristics is equivalent to a VSG, theexisting implementation methods of various VSGs are summarized, and a unified VSG model including phase-lockedloop and dynamic and steady-state damping characteristics is summarized ; The genetic algorithm is used to realize theaccurate identification of the inertia and damping parameters of the unified VSG model, but the control parameters of thephase-locked loop cannot be accurately identified. For this reason, the relationship between the accuracy of phase-lockedloop parameter identification and its bandwidth is analyzed in detail from the perspective of the closed-loop pole of thesystem. And a solution is proposed to select the unified VSG model of the high-bandwidth phase-locked loop to identifythe equivalent inertia and damping of the grid-connected inverter. Finally, the MATLAB/simulink simulation verifiesthe applicability and effectiveness of the proposed model identification method under a variety of different VSG controlstrategies.