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In order to ensure the security, the stability and the economic operation of the power grid, the energy storage system had been widely used in the power system. By regulating the power and the operation state, the flexibility of network is increased actively, so that the economic dispatch purpose of power network is achieved. First, in this paper, the power, the capacity, the state maintenance time,...
To ensure the security, stability and economic operation of the grid, energy storage system had been widely used in power system. Improving the flexibility of the network by regulating the power and operational status, and also to achieve the economic dispatch purpose. Firstly, in this paper, considering the power, capacity, state maintenance time, ramp rate and other constraints of the energy storage...
In recent years, the proportion of the wind power in the grid is increasing rapidly. When the grids faults results in voltage decline, the widespread tripping of wind generators could lead to transient instabilities and local or overall blackouts. So it is concerned that the wind turbines merge into the grid and the request of the low voltage ride through (LVRT) ability is proposed. This paper analysises...
In this paper, damping controller for dynamic and transient control of a variable speed wind turbine is presented. The phenomenon of drive train oscillations in wind turbines is discussed. It is illustrated how the damping controller is able to reduce the oscillations of the drive train significantly and mitigate fatigue damage due to drive train oscillations we studied the effect of damping controller...
For the consideration of the existing switching device power level, a converter circuit topology is proposed in this paper, which is accorded with the requirement of high-power direct-drive outer rotor permanent magnet generator. Particularly, a control method based on ??non-controlled retification, boost chopper and SPWM inverter circuit?? is proposed. Designs of the boost chopper circuit and the...
A control method is proposed to the imbalance of blade stresses in collective pitch control system of megawatt scale wind turbine. First, the three collective pitch angles can be calculated by fuzzy control algorithm. Then distribute the three pitch angle through weight coefficient of rotor azimuth angle. And the respective pitch angle of the three blades is obtained. The blade stresses and power...
According to emergency grid rule requirements, wind farm should has the ability to stay connected and continue generation under external voltage failure conditions, that is, wind turbines have to keep in connection with grid and own continue power supply. Consequently, the dynamic model of double fed wind turbines, converter model and grid model were established to study the transent characters of...
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