| As the development of clean energy and wind power, the influence of wind power base of large power grids has increased. Dynamic reactive power compensation device has long history and the technology is relatively mature. Reactive power compensation device can adjust the wind farm grid voltage effectively. Low voltage is one of the conditions often occur in power grid. It needed a strategy coordinate dynamic reactive power compensation in wind power base to accommodate a variety of work conditions.The study states from two angles: the influence of wind power bases and various conditions of large power grids; coordinated control of wind turbines and reactive power compensation device.Under static conditions, in order to comply with the grid voltage optimization curves, illustrate the effect of reactive power compensation devices on the grid, in the PSD-BPA quantitative analysis of the relationship between the dynamic reactive power capacity and Dunhuang bus voltage, select a reference to configure the size capacity. Under dynamic conditions, illustrate the effect of reactive power compensation device for large power grid in several common conditions, and the different effects and reactive power compensation device for qualitative analysis of large power grids. Described in the three typical conditions, the reactive power compensation device low voltage effect is most obvious, and STATCOM is best in the three reactive power compensation.There are similarities of working principle between STATCOM with the doubly-fed wind turbine grid side converter. In certain control strategies they can provide reactive power to the grid and then adjusted grid voltage. For double-fed wind farm, STATCOM and the impact of low voltage ride through coordinated control strategy is proposed to build simulation models in PSCAD/EMTDC to verify coordinated control strategy, which can improve the low voltage ride-through capability of wind farms effectively. |
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