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The arrangement of the technical requirements within grid codes and related documents varies between electricity systems. However, for simplicity the typical requirements for generators can be grouped as follows:Tolerance - the range of conditions on the electricity system for which wind farms must continue to operate;
- Control of reactive power - often this includes requirements to contribute to voltage control on the network;
- Control of active power;
- Protective devices;
- Power quality.
It is important to note that these requirements are often specified at the Point of Common Coupling (PCC) between the wind farm and the electricity network. In this case, the requirements are placed at wind farm level, and to achieve them the requirements for the wind turbines may have to be different. Often, wind turbine manufacturers specify the performance of their wind turbines, rather than that of the entire wind farm.
It is also possible for some requirements to be met by providing additional equipment, separate from the turbines; where relevant, this is indicated below.
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