This paper presents Permanent Magnet Synchronous generator (PMSG) based a variable speed wind turbine systems including energy capacitor system (ECS). The ECS is the combination of electric double layer capacitor (EDLC) known as super capacitor and power electronic devices for wind power application with its detailed modeling and control strategy which can supply smooth electrical power to the power grid and makes the system better stable and reliable. As generated power from wind fluctuates randomly, the objective of this control system is to select a line power reference level and to follow the reference level by absorbing or providing active power to or from ECS to smooth output power fluctuation penetrated to the grid and to keep the wind farm terminal voltage at a desired level by supplying necessary reactive power. The performance of the proposed system is investigated by simulation analysis using PSCAD/EMTDC software.
- Variable speed wind generator
- Permanent Magnet Synchronous generator (PMSG)
- Energy Capacitor System (ECS)
Fig. 1. Model System
EXPECTED SIMULATION RESULTS:
Fig. 2. Response of real wind speed data [case-I]
Fig. 3. Response of PMSG generated Active Power [case-I]
Fig. 4. Grid terminal voltage without & with ECS [case-I]
Fig. 5. Grid Power with/without EDLC and EDLC power [case-I]
Fig. 6. Grid Active Power without and with EDLC [case-I]
Fig. 7. EDLC active Power [case-I]
Fig. 8. EDLC energy [case-I]
Fig. 9. Comparison with SMA and ECS
Fig. 10. Response of Wind speed [case-II]
Fig. 11. PMSG generated Active Power [MW] [case-II]
Fig. 12. Grid Active Power without and with EDLC [case-II]
Fig. 13. EDLC active power [case-II]
Fig. 14. EDLC energy [case-II]
Fig. 15. Grid terminal voltage without & with ECS [case-II].
Fig. 16. Frequency deviation of SMA, ECS & without ECS [case-I].
The simulation results show that the quality of the terminal voltage and output power penetrated to the grid is not good but continuously varying without ECS system. Besides, when we used ECS system, the terminal voltage and grid power is almost constant and quality of voltage and power is excellent. So, using ECS system smoothed power can be supplied to the grid by charging and discharging of EDLC. By using low pass filter to calculate line power reference instead of SMA, EMA makes the system very simple, compact and cost effective. Therefore, it can be concluded that this proposed system can be applied effectively in power systems to generate high quality electrical power from the natural fluctuating wind.
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