Abstract
droop coefficient of the traditional droop control strategy in micro-grid is fixed, and lead to the contradiction between speed of dynamic response, frequency and voltage stability of the system. In order to solve this problem, a nonlinear dynamic droop control strategy is proposed. By utilizing the characteristics of the slope of hyperbolic tangent curve, the droop coefficient is constantly changing. The droop control is carried out by replacing the traditional droop line with hyperbolic tangent curve, which makes the droop coefficient adjust dynamically with the change of the system, and makes the micro-grid adopt droop control strategy to adjust the stability of frequency and voltage. The simulation model of traditional droop control strategy and improved droop control strategy is built on Matlab/Simulink platform, and the simulation comparison is carried out under the same conditions. The simulation results verify the feasibility of improved droop control strategy.
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