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This paper investigates virtual inertia control for dc microgrids using voltage droop control as the power-sharing strategy. An adaptive virtual inertia control (AVIC) strategy with the variable droop coefficient is proposed to increase the inertia of the dc microgrid. By swinging the droop curve during transient events, the dc voltage change rate is reduced. The variable droop coefficient is modified...
This paper proposes an output power smoothing control strategy for the wind farm without any other energy storage devices (ESS), which is based on the allocation and control of the wind turbines (WT). The wind turbines in the wind farm are divided into control wind turbines (CWT) and power wind turbines (PWT) separately while playing different roles. The PWTs are expected to output as much power as...
Characteristics of PMSGs used for current-source type wind farm composed of series-connected wind generators are studied. A series of experiments was carried out with an experimental set composed of series-connected thyristor rectifiers with PMSGs as wind turbine generators and current-source thyristor inverter. A simulation model based on trapezoidal waveforms of armature electro-motive force for...
Steady-state characteristics of self-excited synchronous generators with damper windings used for current-source type wind farm composed of series-connected wind generators are studied. A simulation model of the generators with damper windings is first derived based on dq transformation for salient-pole type machines. Experimental investigations were carried out to confirm the validity of the simulation...
This paper studies the transient and sustained ferroresonance phenomenon in wind farms connected to a power distribution system. Ferroresonance can be critical for wind turbines during switching or fault conditions. This results in effects such as harmonics, voltage dips and overvoltage in the system [1]. The ferroresonance current is able to damage the machine and the rotor side converter, and as...
When the variable speed wind turbines with virtual inertia are connected to the grid, the transient stability control of the interconnected system will be more flexible. Firstly, the linearized state equation of equivalent two-machine system with wind power was derived, and respective influences of terminal unit inertial changes on the transient stability of power system were analyzed. Secondly, a...
Islanded DC microgrid is equipped with energy storage unit to balance the power between renewable energy power generation and load. Battery becomes one of the optimum choices for energy storage unit with many advantages. To avoid battery deep charging and discharging and prolong its service life, a multi-source coordinated control strategy for islanded DC microgrid is proposed based on battery's state...
Operating characteristics of a large-scale wind farm consisting of series-connected outputs of thyristor rectifiers with 10 wind generators and current source thyristor inverter are simulated. The simulation model is constructed based on MATLAB/Simulink and PLECS. Instantaneous waveforms of various parts of the system are shown considering the wind speed distribution.
In view of the appearance of parallel stator winding open circuit fault in large capacity permanent magnet wind turbines, the negative sequent current is caused in stator windings, which may endanger the stability of the wind turbine. With the 2-D transient electromagnetic field, the negative sequence current with the rated condition and fault condition is calculated. Further more, the change rule...
This article presents a two-stage fault detection and classification scheme, for induction motor drives in wind turbine pitch systems. The presented approach is suitable for application in offshore wind farms. The adopted strategy utilizes three phase motor current sensing at the pitch drives for fault detection and only when a fault is detected at this stage, features extracted from the current signals...
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