Converter-based generators and method for feeding in electrical power

A method for feeding electrical power into an electrical supply network having a network voltage with a network frequency using a converter-based generator, comprising:

• estimating a converter proportion of a network section of the electrical supply network, wherein the converter proportion represents a ratio of power fed in by converters to a total power fed in;
• feeding the electrical power into the electrical supply network in a normal mode depending on the estimated converter proportion;
• activating a first support mode depending on the estimated converter proportion in accordance with a first activation condition;
• and
• activating a second support mode depending on the estimated converter proportion in accordance with a second activation condition different than the first activation condition, wherein:
• a dominant type of power plant of the network section is detected among generators that do not use converters for infeed,
• as a type of power plant of the generators that do not use converters for infeed, a distinction is made at least between a base load power plant and a regulation power plant or between a nuclear power plant, a coal-fired power plant, a gas-fired power plant and a hydroelectric power plant,
• the dominant type of power plant is a type of power plant which, among the generators that do not use converters for infeed, is capable of feeding the most power into the network section, and
• the first support mode, the second support mode or a third support mode is selected and/or at least one supplementary control is selected and used depending on the dominant type of power plant.

A wind power system for feeding electrical power into an electrical supply network having a network voltage with a network frequency, comprising:

• a controller configured to estimate a converter proportion of a network section of the electrical supply network, wherein the converter proportion represents a ratio of power fed in using converters to a total power fed in;
• and
• an inverter configured to feed the electrical power into the electrical supply network in a normal mode depending on the estimated converter proportion, wherein the feeding of the electrical power in the normal mode is in response to the estimated converter proportion being below a first reference value,
• wherein the controller is configured to:
• activate a first support mode depending on the estimated converter proportion in accordance with a first activation condition, wherein the activating of the first support mode is in response to the estimated converter proportion being equal to or greater than the first reference value and
• activate a second support mode depending on the estimated converter proportion in accordance with a second activation condition different than the first activation condition, wherein the activating of the second support mode is in response to the estimated converter proportion being equal to or greater than a second reference value, wherein the second reference value is greater than the first reference value.