Synchronization and Reactive Current Support of PMSG based Wind Farm during Severe Grid Fault


Framework codes require wind ranch to stay on-matrix and infuse explicit responsive current when network blame happens. To fulfill the prerequisites, receptive power gadgets, for example, the static synchronous compensator (STATCOM) are normally utilized in present day wind ranches. So as to create responsive flows, the breeze vitality age framework (WECS) and the STATCOM are regularly controlled with the stage bolted circle (PLL)- situated vector control strategies. Because of the dynamic power unevenness between the age and utilization, the breeze cultivate has the danger of losing synchronization with the framework under serious blame conditions. This paper investigates the dynamic synchronization system and strength criteria of the breeze cultivate and proposes a planned current control plot for the WECS and the STATCOM amid serious lattice blame period. The synchronization strength of both the WECS and the STATCOM is stayed by the dynamic power adjusting control of the breeze cultivate. The control targets of the generator-and matrix side converters for the WECS are swapped to maintain a strategic distance from the communication between the dc-interface voltage control circle and the synchronization circle. The synchronized STATCOM produces extra receptive flows to enable the breeze to cultivate meet the necessities of the network code. Adequacy of the hypothetical examinations and the proposed control technique are checked by recreations.



Fig. 1. Configuration of the PMSG-based wind farm



Fig. 2. System response of the PMSG-based wind farm with conventional control strategy during severe fault

Fig. 3. System response of the PMSG-based wind farm with proposed strategy during severe fault



This paper examined the LOS instrument and the planning LVRT plan of the PMSG based breeze cultivate when extreme lattice voltage plunge happens. The accompanying ends can be gotten from the hypothetical investigations and reproduction check:

(1) Variable-speed wind turbines and STATCOM both have the LOS chance when the matrix voltage plunge is extreme.

(2) The proposed dynamic power adjusting control conspire which depends on the recurrence dynamic of the PLL can accomplish the synchronization strength of the WECS. Be that as it may, receptive current capacity of the WECS would be yielded to actualize such plan.

(3) The organized current control between the PMSG based WECS and the STATCOM can accomplish both the synchronization strength and the responsive current help as indicated by the framework code under extreme matrix blame. The examination results and proposed conspire are likewise accessible for the LVRT of other sustainable power source change frameworks.

(4) It ought to be brought up that this paper centers around the symmetrical blame conditions. In useful applications, unsymmetrical shortcomings happen more frequently than symmetrical ones. Some Europe lattice codes, for example, “VDE-AR-N 4120” code in Germany, are requiring the WECS to give negative succession current remuneration amid unsymmetrical blame period. In such cases, the progressed PLL, for example, the second request summed up integrator (SOGI) PLL, ought to be utilized to isolate the positive and negative succession parts from the lattice voltage. The progressed PLLs have significantly more confounded structures and models contrasted and the regular one as showed in this paper. Likewise the synchronization strength ought to be talked about in both positive and negative groupings. By further considering the coupling of the PLL and control circles amid network blames comparably with the case examined in this paper, the synchronization issue would be progressively confused. More examinations are normal in this issue and would be our future work.

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