Abstract
Micro-grid has received extensive attention as an effective way to absorb new energy. Compared to large power systems, the micro-grid system consisting of power electronics is relatively weak due to the lack of support for synchronous machines. In this paper, the direct-drive wind turbine (WT) is connected to the low-inertia micro-grid as the research background. Based on the virtual inertia control of the WT, the inertia source and the physical mechanism of the WT connected to the micro-grid system are studied. The inertia characteristics of the rotor of the WT on the electromechanical time-scale, the DC side capacitor on the DC voltage time-scale, and the simulated grid under the droop control are analyzed. The research results show that under the control of the system, the inertia of the system is derived from the WT, DC capacitor, and the micro-grid simulated by droop control converter. The equivalent inertia of each link is determined by the control parameters, steady-state operating point, and structural parameters. The resulting inertia characteristics will have frequency domain characteristics under control. Finally, the correctness of the system inertia analysis conclusion is verified by simulation and experiment.
Highlights
As an effective means of new energy consumption and utilization, micro-grid has received wide attention in recent years
Permanent-magnet synchronous generator (PMSG) based wind turbine (WT) with maximum power point tracking (MPPT) control is regarded as inertia-less in power systems due to no response to disturbances from the grid
WT output transient power does increase as shown in Figure 14d, indicating that the rotor responds to the system frequency change by releasing or storing kinetic energy
Summary
As an effective means of new energy consumption and utilization, micro-grid has received wide attention in recent years. Combined converter with energy the impact ofelectric doublytorque fed induction wind turbines with virtual the inertia control on power storagesmall-stability devices to examine the effects of twoofdifferent controlConsiderable strategies on studies the inertia and damping system considering the effects. References [21,22] combined the converter with energy side capacitance of WT power system is analyzed from electromechanical time-scale and DC voltage storage devices to examine the effects of two different control strategies on the inertia and damping time-scale. WTs incline technological economy of the effect generation method fully and accurately understands the inertial to equip inertia control, but the mechanism studies about the impact of inertia characteristics of the characteristics of the direct-drive WT power system, which lays a foundation for the low-cost inertial renewable energy sources’ (RESs) supply side energy is not enough. The technological economy of the effect generation method fully and accurately understands the inertial characteristics of the direct-drive WT power system, which lays a foundation for the low-cost inertial control of the WT power system
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