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Wind Farm Impact in Power System and Alternatives to Improve the Integration Part 11

Tham khảo tài liệu 'wind farm impact in power system and alternatives to improve the integration part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Dynamic Simulation of Power Systems with Grid Connected Windfarms 239 Fig. 19 and 20 show the response of the induction generator terminal voltage with SVC TCSC and STATCOM. uPfC. It can be concluded that terminal voltage of the DFIG is above 0.75 p.u. after 0.1 seconds. Comparing Fig. 18 19 and 20 it can be concluded that the UPFC improves the fault ride through capability of the DFIG very effectively. Terminal Voltage p.u Fig. 19. Induction Generator Terminal Voltage - Effect of SVC and TCSC Terminal Voltage p.u Time sec Fig. 20. Induction Generator Terminal Voltage - Effect of STATCOM and UPFC 4.5 Effect of wind speed variations The dynamic performance of the FACTS controllers with doubly fed induction generator DFIG based wind farm is investigated using the wind speed model shown in Fig. 21. 7 240 Wind Farm - Impact in Power System and Alternatives to Improve the Integration Fig. 21. Wind speed Model considered for long term dynamic simulation The average wind speed is around 5 Km h approximately. The wind speed data are obtained by measuring the wind speed changes over an hour from the regional meteorological website. It can be observed that during the time period from 0- 1000 sec the wind speed fluctuates around an average wind speed of 5 Km h. But the wind speed reaches 16 Km h around 1 200 seconds. The corresponding rotor speed variation by the induction generator is shown in Fig 22. It can be observed that the rotor speed changes from its initial value to 1.25 p.u. following wind speed increase at 1200 seconds. Fig. 22. Rotor Speed response of DFIG The corresponding active power variations are shown in Fig.23. Dynamic Simulation of Power Systems with Grid Connected Windfarms 241 Time Sec Fig. 23. Active Power Injected by the wind farm The active power variations following the wind speed changes are highly fluctuating from the steady state load flow level to the grid. The performance coefficient Cp of the wind turbine is kept as 0.48 in the algebraic .