Analysis of Dynamic Voltage Stability on The Penetration of Adama Ii Wind Farm in Ethiopian Grid
| dc.contributor.advisor | Fekadu, Shewarega (PhD) | |
| dc.contributor.author | Anchinesh, Mengistu | |
| dc.date.accessioned | 2020-06-17T06:18:50Z | |
| dc.date.accessioned | 2023-11-28T14:26:39Z | |
| dc.date.available | 2020-06-17T06:18:50Z | |
| dc.date.available | 2023-11-28T14:26:39Z | |
| dc.date.issued | 2017-09 | |
| dc.description.abstract | Wind energy is one of the most available and exploitable forms of renewable energy. The importance of wind farm penetration is that it can reduce or replace the existing conventional generators. The integration of wind farm to the existing grid introduces new challenges regarding power system which need to be addressed. Among power system stability concerns, voltage stability due to the integration of wind farms is the one that considerably affect the grid. By now, Ethiopia has wind energy sources with installed capacity of 324 MW that consist of three wind farms. Among them the largest operational wind farm is Adama II, which has been considered in this thesis, uses Doubly Fed Induction Generator Wind Turbine (DFIG WT). In this study, Adama II wind farm is aggregated from 102 wind turbines to single turbine representation. Thus, the dynamic model of DFIG WT has been developed and verified using load flow analysis. And the simplified grid model has been developed also. This model is used to analyze the dynamic voltage stability as regards the penetration of Adama II wind farm in Ethiopian existing national grid. The modeling, simulation studies and analysis has been done using Power System Simulator for Engineering (PSS /E) software. The compliance of the grid code behavior of the wind farm has been investigated based on the detailed analysis of the contingency scenario of that a bolted symmetrical three-phase fault applied at the point of common coupling (PCC) for 150 ms. After fault clearance, the voltage recovers to 1.032 p.u at the PCC and within 0.6 second following the fault clearance other buses restored to the super grid voltage. The active power output and the reactive power restored to 0.9 of the level available immediately before the fault. The results show that Adama II wind farm integrated to the Ethiopian power grid fulfills the wind grid code requirements in response to the short circuit event. The thesis also analyzes the voltage control capability of Adama II wind farm voltage controller on the power system dynamic voltage stability. To study its influence, wind generator equipped with /without voltage controller is considered. The voltage at the PCC gradually recovers to 1.038 p.u and 1.059 p.u with and without voltage controller respectively after the clearance of short circuit fault .It is observed that the voltage with out voltage control strategy exceeds the normal limit of 1.05 p.u. Finally, the analysis of wind farm performance in weak grid has been done . It can be observed that the voltage on the far end substation bus bar is 0.934 p.u and 1.0639 p.u with low and maximum load respectively. In this case, the results show that voltages are violated the standard voltage range. The simulation results depict that, the contribution of voltage controller is visible since it enhances the wind farm capability during the fault as compared with no voltage control is enabled. Therefore, the wind farm is able to fulfill the control characteristic of the controller that can improve power system dynamic behavior such as voltage stability as spelt out in international grid codes. And also it is recommended that EEP has to implement and equipped with voltage controller for all wind farms. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/21617 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | wind farm | en_US |
| dc.subject | DFIG | en_US |
| dc.subject | dynamic voltage stability | en_US |
| dc.subject | aggregated wind farm | en_US |
| dc.subject | PSS/E | en_US |
| dc.subject | wind farm penetration | en_US |
| dc.subject | contingency scenario | en_US |
| dc.subject | national grid | en_US |
| dc.subject | PCC | en_US |
| dc.subject | grid code | en_US |
| dc.subject | voltage control | en_US |
| dc.title | Analysis of Dynamic Voltage Stability on The Penetration of Adama Ii Wind Farm in Ethiopian Grid | en_US |
| dc.type | Thesis | en_US |