WIND TURBINE CONTROL SYSTEM
Publication Date: 2014-Nov-17
The IP.com Prior Art Database
The invention relates to a wind turbine control system configured to manage power generation more effectively, particularly, though not exclusively, during overload conditions. A wind turbine power conversion system including a power converter, at least one circuit breaker, and a controller configured to: implement a circuit breaker model associated with the circuit breaker, said model providing a modelled load trip condition; monitor an actual load condition of the power converter during operation of the wind turbine; comparing the actual load condition with the modelled load trip condition; and implementing a protective function if it is determined that the actual load condition exceeds a modelled load trip condition. A method for operating a power conversion system of a wind turbine, the power conversion system including a power converter and a circuit breaker, the method comprising: implementing a circuit breaker model associated with the circuit breaker of the power conversion system, said model providing a modelled load trip condition; monitoring an actual load condition of the power converter during operation of the wind turbine; comparing the actual load condition with the modelled load trip condition; and implementing a protective function in the event that it is determined that, as a result of the comparison, the actual load condition exceeds the modelled load trip condition.
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WIND TURBINE CONTROL SYSTEM
Field of the invention
The invention relates to a wind turbine control system configured to manage power
By their nature, wind turbines operate most effectively when cited in locations which experience strong and consistent wind conditions. However, wind conditions are dynamic, and this imposes significant challenges on the design of wind turbines, and particularly for the control of the power conversion system, central to which is the power converter.
Variable wind speeds lead to a variable current loading on the power conversion system, and so the power converter must be designed to accommodate a wide range of transient conditions. To guard against damage occurring to the power converter, it typically will be designed with various protective measures, both in hardware and software, which are
time than the typical power converter safety measures, and will trip in the event that its in-built current loading limits are exceeded.
Although circuit breakers provide crucial protection to the power conversion system, they are a last-resort protective measure since their operation triggers a costly exercise during
generation more effectively, particularly, though not exclusively, during overload conditions.
Background to the invention
operable to monitor operating variables and take action to shut down the wind turbine in the event that any limits are exceeded. However, such protective measures have their practical limits and, in some circumstances they are ineffective, such as in severe overloading conditions and in grid short-circuits. Thus, as a backup measure, power conversion systems typically incorporate circuit breakers that have a faster response 25
which a manual inspection of the power conversion system is required before the circuit breaker can be reset. At the very least this will mean that the wind turbine will be out of action for a period of time. More than this, though, the access to the wind turbine may be restricted, particularly if the wind turbine is located offshore, so such a maintenance event comes at considerable time, cost and inconvenience. 35
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It is against this background that the invention has been devised.
Brief description of the drawings
Figure 1 is a simplified schematic view of a wind turbine system, including a
power conversion control system;
Figure 2 is a trip curve of a circuit breaker of the wind turbine system; and
Figure 3 is a flow diagram of a process for predicting a trip event of the circuit
Detailed description of embodiments of the invention
It is an aim of the invention to improve the ability of a wind turbine to accommodate
other conventional features that are common to wind turbines are not shown here for brevity, for example the nacelle, tower, control network, power distribution network and so on. However, the skilled person would understand that these features are implicit. Also it should be noted that the specific a...