Abstract
Unlike the traditional method for power quality improvement and low-voltage ride through (LVRT) capability enhancement of wind farms, this paper proposes a new wind power integrated system by means of an inductive filtering method, especially if it contains a grid-connected transformer, a static synchronous compensator (STATCOM) and fully-tuned (FT) branches. First, the main circuit topology of the new wind power integrated system is presented. Then, the mathematical model is established to reveal the mechanism of harmonic suppression and the reactive compensation of the proposed wind power integrated system, and then the realization conditions of the inductive filtering method is obtained. Further, the control strategy of STATCOM is introduced. Based on the measured data for a real wind farm, the simulation studies are carried out to illustrate the performance of the proposed new wind power integrated system. The results indicate that the new system can not only enhance the LVRT capability of wind farms, but also prevent harmonic components flowing into the primary (grid) winding of the grid-connected transformer. Moreover, since the new method can compensate for reactive power in a wind farm, the power factor at the grid side can be improved effectively.
Highlights
In recent years, wind power generation has become a very attractive source of renewable energy thanks to its unique merits: it is economical, clean and inexhaustible
It is worth noting that the modern wind turbines are based on the voltage source converters (VSCs), which consist of power electronics device and employ a carrier-based pulse width modulation (PWM) technique
Due to the machine‐side converter (MSC) not being directly connected to the grid, the harmonic currents and the grid‐side converter (GSC) adopt the PWM techniques for insulated gate bipolar transistor (IGBT) control [26,27]
Summary
Wind power generation has become a very attractive source of renewable energy thanks to its unique merits: it is economical, clean and inexhaustible. In order to improve the power quality, wind farms mainly adopt the passive power filtering (PPF) method to suppress the harmonic currents and compensate for reactive power. Reactive to power and with improving the LVRT capability, thisofpaper proposes a new wind power integrated means of the combination of the inductive filtering method compensating and a STATCOM. The proposed wind power integrated system fully utilizes the filtering method was first proposed in [19] for the high-voltage DC (HVDC) system, and [20,21] showed the outstanding performance on harmonic suppression and reactive power compensation, respectively. 3 ofaiming ability of the new grid-connected transformer with fully-tuned (FT) branches and STATCOM, at the power quality improvement and LVRT capability enhancement of wind farms.
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