Method for black starting wind turbine, wind farm, and restoring wind farm and wind turbine, wind farm using the same

Patent metadata

Field	Value
Publication number	US-10156225-B2
Application number	US-201615360108-A
Country	US
Kind code	B2
Filing date	Nov 23, 2016
Priority date	Nov 24, 2014
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

A method for black starting a wind turbine and a wind farm following islanding operation, a method for restoring the wind farm following the islanding operation, and the wind turbine and wind farm. The wind turbine comprises auxiliary equipment, a generator, a converter electrically connectable to the generator, and an energy storage system, the generator is electrically connectable to the auxiliary equipment via the converter, the energy storage system is electrically connectable to the auxiliary equipment. The method for black staring the wind turbine including: measuring wind blowing smoothness degree; selecting a first power source to supply first power to the auxiliary equipment in V/f control mode and selecting a second power source to adjust an amount of active power and reactive power fed to the auxiliary equipment by the first power source in consideration of the amount of active power and reactive power demand suitable for powering the auxiliary equipment; and connecting the power sources to the auxiliary equipment.

First claim

The invention claimed is:

1. A method for black starting a wind turbine following islanding operation, wherein the wind turbine comprises auxiliary equipment, a generator, a converter electrically connectable to the generator, and an energy storage system, the generator is electrically connectable to the auxiliary equipment via the converter, the energy storage system is electrically connectable to the auxiliary equipment, the method including:
measuring wind blowing smoothness degree;
determining whether the measured wind blowing smoothness degree is above a smoothness threshold;
in response to determining the measured wind blowing smoothness degree is above the smoothness threshold, selecting the generator as a first power source to supply first power to the auxiliary equipment in V/f control mode and selecting the energy storage system as a second power source to adjust an amount of active power and reactive power fed to the auxiliary equipment by the first power source in consideration of amount of active power and reactive power demand suitable for powering the auxiliary equipment;
in response to determining the measured wind blowing smoothness degree is not above the smoothness threshold, selecting the energy storage system as a first power source to supply power to the auxiliary equipment in V/f control mode and selecting the generator as a second power source to adjust an amount of active power and reactive power fed to the auxiliary equipment by the first power source in consideration of the amount of active power and reactive power demand suitable for powering the auxiliary equipment; electrically connecting both of the selected first power source and the selected second power source to a power input terminal of the auxiliary equipment to supply the first power and the second power.

2. The method according to claim 1 , further including:
the selected second power source supplies the second power in P/Q control mode.

3. The method according to claim 2 , wherein:
if the generator is selected as the first power source,
the method further includes:
if the energy storage system capacity is enough, the selected second power source supplies the second power in V/f control mode;
otherwise the selected second power source supplies the second power in P/Q control mode.

4. The method according to claim 1 , wherein:
if the generator is selected as the first power source,
the method further includes:
if the energy storage system capacity is enough, the selected second power source supplies the second power in V/f control mode;
otherwise the selected second power source supplies the second power in P/Q control mode.

5. The method according to claim 1 , wherein:
for the selected first power source in V/f control mode, its voltage and frequency reference is calculated according to measurements of reactive and active power at output of the first power source; and
for the selected second power source in P/Q control mode, its active and reactive power reference is calculated according to measurements of the frequency and voltage at output of the second power.

6. A method for black starting a wind farm during islanding mode, where wind farm includes a multiple of wind turbines electrically connectable to each other via a cable, including:
choosing one wind turbine among the plurality of wind turbines;
black starting the chosen wind turbine according to the method according to claim 1 ;
electrically connecting the chosen wind turbine to the cable;
regulating voltage and frequency of the first power source of the other wind turbine among the plurality of wind turbines to approach measurements of the voltage and frequency on the cable; and
electrically connecting the other wind turbine to the cable.

7. A method for black starting a wind farm during islanding mode, where the wind farm includes a multiple of wind turbines electrically, a substation level energy storage system and a substation level auxiliary equipment connectable to each other via a cable, including:
choosing one wind turbine among the plurality of wind turbines;
black starting the chosen wind turbine according to the method according to claim 1 ;
electrically connecting the chosen wind turbine to the cable;
regulating voltage and frequency of the substation level energy storage system operation in V/f control mode to approach the measurements of the voltage and frequency on the cable; and
electrically connecting the substation level energy storage system and the substation level auxiliary equipment to the cable.

8. A method for restoring a wind farm following islanding mode, wherein the wind farm includes a multiple of wind turbines electrically connectable to each other via a cable, including:
choosing at least one wind turbine among the plurality of wind turbines;
black starting the chosen wind turbine according to the method according to claim 1 ;
electrically connecting main grid to the cable;
regulating voltage and frequency of the first power source of the chosen wind turbine among the plurality of wind turbines to approach measurements of the voltage and frequency on the cable; and
electrically connecting the chosen wind turbine to the cable.

9. A wind turbine, including:
a generator;
a converter electrically connectable to the generator;
an energy storage system;
a first measurement device for measuring wind blowing smoothness;
a wind turbine controller;
a first switch, being arranged between a power output of the converter and a power input of the auxiliary equipment;
a second switch, being arranged between a power output of the energy storage system and the power input of the auxiliary equipment;
following islanding operation of the wind turbine, the wind turbine controller is adapted for:
if the measured wind blowing smoothness degree is above a smoothness threshold, selecting the generator as a first power source to supply first power to the auxiliary equipment in V/f control mode and selecting the energy storage system as a second power source to adjust an amount of active power and reactive power fed to the auxiliary equipment by the first power source in consideration of amount of active power and reactive power demand suitable for powering the auxiliary equipment;
otherwise selecting the energy storage system as a first power source to supply power to the auxiliary equipment in V/f control mode and selecting the generator as a second power source to adjust an amount of active power and reactive power fed to the auxiliary equipment by the first power source in consideration of the amount of active power and reactive power demand suitable for powering the auxiliary equipment; and
controlling to close the first switch and the second switch to supply the first power and the second power to the auxiliary equipment.

10. The wind turbine according to claim 9 , wherein:
the selected second power source supplies the second power in P/Q control mode.

11. The wind turbine according to claim 10 , wherein:
if the generator is selected as the first power source,
if the energy storage system capacity is enough, the selected second power source supplies the second power in V/f control mode;
otherwise the selected second power source supplies the second power in P/Q control model.

12. The wind turbine according to claim 9 , wherein:
if the generator is selected as the first power source,
if the energy storage system capacity is enough, the selected second power source supplies the second power in V/f control mode;
otherwise the selected second power source supplies the second power in P/Q control model.

13. The wind turbine ac

Assignees

• Abb Schweiz Ag

Inventors

• Huang Xing
• Chen Yao

Classifications

• H02J11/00

  Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted · CPC title

• F05B2270/32

  Wind speeds · CPC title

• F05B2270/107

  to cope with emergencies · CPC title

• F03D9/25

  the apparatus being an electrical generator (F03D9/22 takes precedence) · CPC title

• F05B2220/706

  an electrical generator · CPC title