Abstract
This paper proposes a methodology to improve the transient stability (TS) of a system with wind energy generators. Induction machines are used widely as generators in the wind power plants. As these induction machines also have the stability problem like other synchronous machines, it is very important to analyze the TS of a system including the wind power plants. In this paper, the simulations and analysis of TS of power system including the induction generators during the short circuit fault conditions are carried out. The effect of pitch angle control on the stability of power system is analyzed. From the simulation results, it can be observed that the pitch control system which prevents the excess wind speed has the significant effect on the TS enhancement of the system. It can also be observed that the controller gain and time constant values have considerable effect on the pitch control system.
Funding statement: This work was supported by Institute for Information & communications Technology Promotion (IITP) grant funded by the Korea government (MSIP) (No. 2015-0-00847, Form factor-free Multi Input and output Power Module Technology for Wearable Devices).
Nomenclature
- ρa
Air density.
- Cp
Power Coefficient.
- Pt
Turbine output power.
- Vqs,
Iqs Stator voltage and current of q-axis.
- Vds,
Ids Stator voltage and current of d-axis.
- Vqr,
Iqr Rotor voltage and current of q-axis.
- Vdr,
Idr Rotor voltage and current of d-axis.
- V
Wind speed.
Flux linkages of d-axis.
Flux linkages of q-axis.
- Rr
Rotor resistance.
- Rs
Stator resistance.
- Ls
Stator inductance.
- Lm
Mutual inductance.
- Lr
Rotor inductance.
- ωr
Rotor speed
- Te
Electromagnetic torque
- m
Mass
- E
Kinetic Energy
- λ
Tip speed ratio.
- β
Pitch angle.
Appendix
A Synchronous generator parameters
| Parameter | Value |
|---|---|
| Rated MVA | 100 |
| Rated voltage | 11 kV |
| Frequency | 50 Hz |
| Reactances | Xd = 1.305p.u, Xd′ = 0.296p.u, Xd′′ = 0.252p.u. Xq = 0.474p.u, Xq′′ = 0.243p.u, X1 = 0.18p.u. |
| Time constants | Tdo′ = 1.01 s, Tdo′′ = 0.053 s, Tq′ = 0.1 s |
| Stator resistance | 0.03p.u. |
| Coefficient of inertia | 3.2 |
B Induction generator parameters
| Parameter | Value |
|---|---|
| Rated MVA | 30 |
| Rated voltage | 0.69 kV |
| Frequency | 50 Hz |
| Stator resistances and inductance | 0.01p.u., 0.1248p.u. |
| Rotor resistances and inductance | 0.04377p.u., 0.1791p.u. |
| Mutual inductance | 3.5p.u. |
| Inertial constant | 1.5 |
| Friction factor | 0.05749 |
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