1. A system for operating a power generation system within a battery storagedischarge mode or a dynamic brake mode, the system comprising:
a power convertor including a rotor side converter, a line side converter and a DC link coupled between the rotor side and line side converters, the rotor side converter being configured to convert AC power to DC power and the line side converter being configured to convert DC power to AC power;
a selector switch coupled to the DC link; and
a switching module coupled between the selector switch and the DC link, the selector switch being configured to selectively couple the switching module to one of a storage device or a resistive element of the power generation system,
wherein the selector switch is movable between a first position, wherein the switching module is coupled to the storage device such that power is capable of being directed between the DC link and the storage device via control of the switching module, and a second position, wherein the switching module is coupled to the resistive element such that power is capable of being directed between the DC link and the resistive element via control of the switching module.
2. The system of claim 1, further comprising a plurality of switching modules coupled between the selector switch and the DC link, wherein, when the selector switch is in the first position, the plurality of switching modules are configured to be operated as a bi-directional DC-to-DC converter for controlling the flow of power to and from the storage device.
3. The system of claim 1, wherein, when the selector switch is in the first position, the switching module is configured to be operated as a DC-to-DC converter for controlling the flow of power from the DC link to the storage device.
4. The system of claim 1, wherein, when the selector switch is in the second position, the switching module is configured to be operated as a brake chopper for the resistive element.
5. The system of claim 1, wherein the switching module comprises a switching element coupled between the DC link and the selector switch and a diode associated with the switching element.
6. The system of claim 1, wherein the storage device comprises at least one battery.
7. The system of claim 1, further comprising a filter associated with the storage device.
8. A method for operating a power generation system within a battery storagedischarge mode or a dynamic brake mode, the method comprising:
operating a power converter of the power generation system, the power converter including a rotor side converter, a line side converter and a DC link coupled between the rotor side and line side converters, the rotor side converter being configured to convert AC power to DC power and the line side converter being configured to convert DC power to AC power;
selectively coupling, via a switching switch, a switching module to one of a storage device or a resistive element of the power generation system, the switching module being coupled to between the switching element and the DC link; and
controlling the switching module in order to regulate a flow of power between the DC link and the one of the storage device or the resistive element.
9. The method of claim 8, wherein selectively coupling the switching module to one of the storage device or the resistive element comprises moving the selector switch to a first position in order to couple the switching module to the storage device.
10. The method of claim 9, wherein controlling the switching module in order to regulate the flow of power between the DC link and the one of the storage device or the resistive element comprises controlling the switching module in a manner that either directs power from the DC link to the storage device or from the storage device to the DC link.
11. The method of claim 8, wherein selectively coupling the switching module to one of the storage device or the resistive element comprises moving the selector switch to a second position in order to couple the switching module to the resistive element.
12. The method of claim 11, wherein controlling the switching module in order to regulate the flow of power between the DC link and the one of the storage device or the resistive element comprises controlling the switching module in a manner that directs power from the DC link to the resistive element.
13. A wind turbine system, comprising:
a wind-driven generator;
a power convertor coupled to the wind-driven generator, the power convertor including a rotor side converter, a line side converter and a DC link coupled between the rotor side and line side converters, the rotor side converter being configured to convert AC power to DC power and the line side converter being configured to convert DC power to AC power;
a selector switch coupled to the DC link; and
a switching module coupled to between the selector switch and the DC link, the switching module, when controlled, being configured to draw power from or transmit power to the DC link, the selector switch being configured to selectively couple the switching module to one of a storage device or a resistive element of the wind turbine system,
wherein the selector switch is movable between a first position, wherein the switching module is coupled to the storage device such that power is capable of being directed between the DC link and the storage device via control of the switching module, and a second position, wherein the switching module is coupled to the resistive element such that power is capable of being directed between the DC link and the resistive element via control of the switching module.
14. The wind turbine system of claim 13, further comprising a plurality of switching modules coupled to between the selector switch and the DC link, wherein, when the selector switch is in the first position, the plurality of switching modules are configured to be operated as a bi-directional DC-to-DC converter for controlling the flow of power to and from the storage device.
15. The wind turbine system of claim 13, wherein, when the selector switch is in the first position, the switching module is configured to be operated as a DC-to-DC converter for controlling the flow of power from the DC link to the storage device.
16. The wind turbine system of claim 13, wherein, when the selector switch is in the second position, the switching module is configured to be operated as a brake chopper for the resistive element.
17. The wind turbine system of claim 13, wherein the switching module comprises a switching element coupled between the DC link and the selector switch and a diode associated with the switching element.
18. The wind turbine system of claim 13, wherein the wind-driven generator comprises a doubly fed induction generator.
19. The wind turbine system of claim 13, wherein the storage device comprises at least one battery.
20. The wind turbine system of claim 13, further comprising a filter associated with the storage device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of optimising content presented to a user within a communications network, wherein the user establishes a session with the communications network and generates one or more session events during that session, the method including the step of:
at least once during that session comparing past performance as a traffic stream of multiple sources of content that could be presented to a user to predetermine traffic performance criteria, to enable content to be presented to the user from a content source meeting the predetermined traffic performance criteria.
2. The method according to claim 1, wherein the past performance as a traffic stream source of each content source is determined by deriving a traffic performance index for each content source.
3. The method according to claim 2, wherein content is presented to a user from the content source having an optimal traffic performance index value.
4. The method according to claim 3, wherein the traffic performance index is derived from one or more key performance indicators representative of user behaviour with each of the multiple sources of content.
5. The method according to claim 4, wherein the key performance indicators are derived from predetermined session metrics related to historical session events.
6. The method according to claim 1, wherein optimisation takes place before the user requests access to content from one of the multiple sources of content.
7. The method according to claim 1, wherein the optimisation takes place during a user request for access for content from one of multiple sources of content.
8. The method according to claim 7, wherein a user requests access to content from a predetermined content category, and optimisation is applied to multiple sources of content meeting that predetermined content category.
9. The method according to claim 8, wherein content from a content source within the predetermined content category having an optimal traffic performance index value is displayed to the user.
10. The method according to claim 1, wherein optimisation takes place after the user requests access to content from one of the multiple sources of content.
11. The method according to claim 10, wherein a user requests access to content from one of the multiple sources of content, and in addition to the requested content, optimised advertising content is then provided to the user.
12. The method according to claim 1, wherein the past performance as a traffic stream source of the multiple sources of content is determined by:
(a) one or more users each establishing a session with related content source within the communications network,
(b) each user generating one or more session events during that session,
(c) determining a session event key for selected session events, (d) deriving one or more predetermined session metrics related to session events generated during each session,
(e) recording the session metrics against one or more of the session event keys,
(f) processing the recorded session metrics to derive one or more key performance indicators representative of user behaviour in relation to each content source, and
(g) deriving a traffic performance index for each content source from the key performance indicators for that content source.
13. The method according to claim 12, wherein the session events include at least one of:
(a) an impression event whenever content is accessed by a user from one of the content sources,
(b) a results event whenever a quantifiable result is achieved, and,
(c) an advertising event whenever advertising content is presented to a user.
14. The method according to claim 13, wherein a session event key is determined for at least each impression event.
15. The method according to claim 12, wherein the recorded session metrics characterise the number of events generated in sessions in which each impression event occurred.
16. The method according to claim 15, wherein the recorded session metrics further characterise the number of sessions during which each impression event occurred.
17. The method according to claim 12, wherein one or more session event keys are determined for identifying the time at which the session event occurred.
18. The method according to claim 12, wherein the session metrics further characterise the total number of at least one of impression events, long held sessions and session length.
19. The method according to claim 12, wherein a session event key is determined for each results event.
20. The method according to claim 12, wherein the session metrics further characterise the nature, cost andor revenue of each results event.
21. The method according to claim 20, wherein the session metrics further characterise the total number of transactions.
22. The method according to claim 12, wherein a session event key is generated for each advertising event.
23. The method according to claim 22, wherein the session event key characterises the identity of the advertising source.
24. The method according to claim 12, wherein the session metrics characterise the number of banner impressions, clicks andor unique clicks from banner impressions.
25. The method according to claim 12, wherein the key performance indicators are derived by selecting and sorting the session metrics according to one or more session event keys.
26. The method according to claim 25, wherein the key performance indicators include at least one of a click through ratio, click to conversion ratio, session to conversion rate, average number of sites per session or like indicator characterising the relationship between impression events, results events and advertising events.
27. The method according to claim 1, wherein data capture is initiated by a client associated with each user or by a server hosting content accessed by or presented to each user.
28. The method according to claim 27, the method further including the steps of:
capturing raw user activity data in a log file, and
transmitting the log file to a central server within the communications network.
29. The method according to claim 28, wherein the log file is batched or transmitted in real time to the central server.
30. The method according to claim 29, the method further including the step:
storing the recorded session metrics in a data storage device associated with the central server.
31. The method according to claim 30, wherein the data storage device includes one or more data tables of session event keys and corresponding predetermined session metrics.
32. A central measurement server including a processing unit and associated memory device for storing program instructions to cause the central measurement server to carry out a method according to claim 1.
33. A computer program including program instructions for use with a central measurement server, the central server including a processing unit and associated memory device for storing the program instructions, wherein the program instructions causes the central measurement server to carry out a method according to claim 1.