Stepwise inertial control of a wind turbine generator to minimize a second frequency dip
| Autor: | Jinsik Lee, Dejian Yang, Yong Cheol Kang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
020209 energy
Automatic frequency control 02 engineering and technology frequency nadir (FN) Turbine second frequency dip (SFD) Electric power system Steam turbine Control theory 0202 electrical engineering electronic engineering information engineering Drop (telecommunication) maximum rate of change of frequency (ROCOF) Inertial control Doubly-fed induction generator stepwise inertial control (SIC) lcsh:Electrical engineering. Electronics. Nuclear engineering Reference function lcsh:TK1-9971 Mathematics Maximum rate frequency recovery |
| Zdroj: | Journal of International Council on Electrical Engineering, Vol 6, Iss 1, Pp 153-159 (2016) |
| ISSN: | 2234-8972 |
| Popis: | Wind turbine generators (WTGs) in power systems with high wind penetration levels are encouraged or forced to participate in frequency control. A stepwise inertial control (SIC) scheme instantly increases WTG output to arrest the frequency drop for a preset period upon detecting a disturbance. After arresting the frequency drop, the output is rapidly reduced to recover the rotor speed. The reduction could cause a power deficit to the power system, which in turn results in a second frequency dip (SFD). This paper proposes an SIC scheme that can improve the frequency nadir (FN) and maximum rate of change of frequency (ROCOF) while minimizing an SFD. To achieve this, a reference function is separately defined prior to and after the FN. To improve the FN and maximum ROCOF, the output is instantly increased by adding a constant, which is proportional to the rotor speed, and maintaining it until the FN is reached. To minimize an SFD, the output is slowly reduced with the rotor speed. This reduction ensures a slow output reduction rate. The performance of the proposed scheme is investigated using an EMTP-RV simulator under different wind speeds and wind power penetration levels. Results clearly demonstrate that the proposed scheme can improve the FN and maximum ROCOF while ensuring a quick frequency recovery. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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