Fault ride through certification procedure for power generating units

Once the requirements for wind power system have been established, another important point is how wind turbine manufacturers and wind park operators can prove the fulfilment of Grid Codes. The Spanish Wind Energy Association (AEE) has developed the document "Procedure for Verification Validation and Certification of the Requirements of the OP 12.3 on the Response of Wind Farms in the Event of Voltage Dips" (PVVC), and the German Fordergesellschaft Windenergie und andere Erneuerbare Energien (FGW) the document "Technical Guidelines for Power Generating Units. Part 8. Certification of the electrical characteristics of power generating units and systems in the medium, high- and highest-voltage grids" that describes the procedures to certify wind power installations according their corresponding Grid Codes.

This section describes the steps to fulfil certificate wind systems by these two procedures. 4.1 PVVC procedure

The PVVC define two possible processes to verify the conformity with the response requirements established in OP 12.3:

• The General Verification Process

• The Particular Verification Process

The General Verification Process consists of verifying that the wind farm does not disconnect and that the requirements stated on the OP 12.3 are met by means of:

• Wind turbine and/or FACTS test

• Wind turbine and/or FACTS validation

• Wind farm simulation

Then three processes must be followed to verify an installation by the General Verification Process and three reports are needed. Next figures show a scheme of these three processes and the three reports obtained. Fig. 7 shows the scheme of the field test process, Fig. 8 the model validation process and Fig. 9 the verification process.

Fig. 7. Field test process.
Fig. 8. Validation process.

Fig. 9. Verification process.

The particular verification process obtains the direct wind farm verification by testing the dynamic elements of the wind farm. In this case, only the process shown in Fig. 7 must be performed. Model validation and wind farm simulation are not needed. In this case, the conditions of the field test will be harder than those of the general verification process. The particular verification process is faster and cheaper than the general verification process. Therefore, wind turbine manufacturer and wind farm operators would prefer this process if the wind turbine or the system wind turbine + FACTS can be tested and can ride through the voltage dip test defined in the Particular Verification Process. General Verification Process is necessary in those wind farms whose wind turbines can not ride through the voltage dip defined in the particular process and a compensating system is installed on the wind farm substation to fulfil the OP 12.3 requirements.

Fig. 9. Verification process.

The particular verification process obtains the direct wind farm verification by testing the dynamic elements of the wind farm. In this case, only the process shown in Fig. 7 must be performed. Model validation and wind farm simulation are not needed. In this case, the conditions of the field test will be harder than those of the general verification process. The particular verification process is faster and cheaper than the general verification process. Therefore, wind turbine manufacturer and wind farm operators would prefer this process if the wind turbine or the system wind turbine + FACTS can be tested and can ride through the voltage dip test defined in the Particular Verification Process. General Verification Process is necessary in those wind farms whose wind turbines can not ride through the voltage dip defined in the particular process and a compensating system is installed on the wind farm substation to fulfil the OP 12.3 requirements.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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