Power generation system, wind power converter, and grid-side frame circuit breaker and control method thereof

Abstract

The application provides a power generation system, a wind power converter, a grid-side frame circuit breaker and a control method thereof. In the grid-side frame circuit breaker, a main structure and an under-voltage release are connected in series, two ends of the series branch are respectively used as two ends of the grid-side frame circuit breaker, an under-voltage release switch is arranged in a power supply circuit of the under-voltage release, and the under-voltage release switch is controlled by a superior controller. Since the under-voltage release switch is closed when a wind power converter in which the grid-side frame circuit breaker is located starts, the under-voltage release switch is opened, i.e. the under-voltage release is tripped, before the wind power converter starts, i.e. when the wind power converter is in a fault-free standby state, so that a path is not formed between the two ends of the grid-side frame circuit breaker at all, and the grid-side frame circuit breaker cannot be manually closed, and thus the grid-side frame circuit breaker can be prevented from being mistakenly closed when the wind power converter is in the fault-free standby state.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, in particular to a power generation system, a wind power converter, a grid-side frame circuit breaker and a control method thereof. BACKGROUND

[0002] With the vigorous promotion of the country, wind power projects have developed rapidly; under the concept of smart operation and safe operation, the design method of safe operation of equipment and devices is particularly important.

[0003] Among them, the grid-side frame circuit breaker in the wind power converter is the connection switch between the wind power converter and the power grid. Under normal circumstances, when the wind power converter is in fault-free standby, the grid-side frame circuit breaker has completed energy storage, that is, the staff can manually close the grid-side frame circuit breaker, so the staff may mistakenly close the grid-side frame circuit breaker; at this time, the DC side of the grid-side module in the wind power converter has not been buffered, that is, the DC capacitor of the grid-side module is in 0V state, so the DC side current of the grid-side module forms a zero-state uncontrolled rectification between the two poles of the DC capacitor, thereby causing damage to the loop device.

[0004] With the market application of high-power wind power converters, the grid-side voltage of the wind power converter is getting higher and higher, and has been increased from the original 690Vac to the voltage level of 1140Vac, so if the staff mistakenly closes the grid-side frame circuit breaker under high grid voltage conditions, it may cause more serious safety accidents.

[0005] Therefore, how to avoid mistakenly closing the grid-side frame circuit breaker when the wind power converter is in fault-free standby is a technical problem to be solved. SUMMARY

[0006] Therefore, the present application provides a power generation system, a wind power converter, a grid-side frame circuit breaker and a control method thereof to avoid mistakenly closing the grid-side frame circuit breaker when the wind power converter is in fault-free standby.

[0007] To achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions:

[0008] The first aspect of the present application provides a grid-side frame circuit breaker, which is arranged in a wind power converter; the grid-side frame circuit breaker comprises a main structure, an under-voltage release and at least one under-voltage release switch; wherein:

[0009] The main contact in the main structure is connected in series with the under-voltage release, and the two ends of the series branch are respectively used as the two ends of the grid-side frame circuit breaker;

[0010] The under-voltage release switch is arranged in the power supply loop of the under-voltage release.

[0011] The under-voltage release switch is controlled by a superior controller to close when the wind power converter starts to start.

[0012] Optionally, further comprising: at least one emergency stop and safety chain switch; wherein:

[0013] The emergency stop and safety chain switch is arranged in the power supply loop of the under-voltage release;

[0014] The control end of the emergency stop and safety chain switch is connected to the safety chain in the wind turbine connected with the wind power converter, and the emergency stop and safety chain switch is used to open when the safety chain is powered off and close when the safety chain is powered on.

[0015] Optionally, the main structure comprises: the main contact, the closing control circuit and the opening control circuit; wherein:

[0016] Both ends of the main contact are respectively used as both ends of the main structure;

[0017] The closing control circuit is controlled by a superior controller to make the main contact attract when the wind power converter is successfully started;

[0018] The opening control circuit is controlled by a superior controller to make the main contact open when the wind turbine connected with the wind power converter fails.

[0019] Optionally, the closing control circuit comprises: a closing coil and at least one closing switch; wherein:

[0020] The power supply end of the closing coil is connected with the power supply end of the closing control circuit;

[0021] The closing switch is arranged between the positive electrode of the power supply end of the closing coil and the positive electrode of the power supply end of the closing control circuit, or between the negative electrode of the power supply end of the closing coil and the negative electrode of the power supply end of the closing control circuit.

[0022] Optionally, the opening control circuit comprises: an opening coil and at least one opening switch; wherein:

[0023] The power supply end of the opening coil is connected with the power supply end of the opening control circuit;

[0024] The opening switch is arranged between the positive electrode of the power supply end of the opening coil and the positive electrode of the power supply end of the opening control circuit, or between the negative electrode of the power supply end of the opening coil and the negative electrode of the power supply end of the opening control circuit.

[0025] Optionally, each switch is a relay.

[0026] The second aspect of the application provides a control method of a grid-side frame circuit breaker, the grid-side frame circuit breaker being the grid-side frame circuit breaker according to any one of the first aspect of the application, and the grid-side frame circuit breaker being arranged in a wind power converter; the on-off control method comprises:

[0027] determining whether the wind power converter starts to start up;

[0028] if the wind power converter starts to start up, controlling an under-voltage release in the grid-side frame circuit breaker to close;

[0029] determining whether the wind power converter successfully starts up in a slow manner;

[0030] if the wind power converter successfully starts up in a slow manner, controlling a main structure in the grid-side frame circuit breaker to close.

[0031] Optionally, after the main structure in the grid-side frame circuit breaker is controlled to close, the method further comprises:

[0032] determining whether a wind turbine connected to the wind power converter has a shutdown requirement;

[0033] if the wind turbine has the shutdown requirement, controlling the main structure in the grid-side frame circuit breaker to open, and controlling the under-voltage release to open.

[0034] Optionally, determining whether the wind turbine connected to the wind power converter has the shutdown requirement comprises:

[0035] respectively determining whether the wind turbine has a fault and whether the wind turbine receives a shutdown instruction;

[0036] if the wind turbine does not receive the shutdown instruction and does not have the fault, determining that the wind turbine does not have the shutdown requirement;

[0037] if the wind turbine receives the shutdown instruction and / or has the fault, determining that the wind turbine has the shutdown requirement.

[0038] The third aspect of the application provides a wind power converter, comprising a machine-side conversion module, a grid-side conversion module, a slow-start branch, a controller, and the grid-side frame circuit breaker according to any one of the first aspect of the application; wherein:

[0039] the generator in the wind turbine is a full-power generator;

[0040] an alternating current side of the machine-side conversion module is connected to a rotor of the generator in the wind turbine, a direct current side of the machine-side conversion module is connected to a direct current side of the grid-side conversion module, and an alternating current side of the grid-side conversion module is connected to a grid side of the wind power converter through the grid-side frame circuit breaker;

[0041] One end of the slow start branch is connected to the grid side of the wind power converter, and the other end of the slow start branch is connected to the connection point of the machine side conversion module and the grid side conversion module.

[0042] The controller is connected to the machine side conversion module, the grid side conversion module, the slow start branch, the grid side frame circuit breaker, and the main control system of the wind power generator, respectively.

[0043] The fourth aspect of the present application provides a wind power converter, comprising: a machine side conversion module, a grid side conversion module, a slow start branch, a stator side switch, a controller, and a grid side frame circuit breaker in the wind power converter according to any one of the first aspect of the present application; wherein:

[0044] The generator in the wind power generator is a double feedback generator.

[0045] The AC side of the machine side conversion module is connected to the rotor of the generator in the wind power generator, the DC side of the machine side conversion module is connected to the DC side of the grid side conversion module, and the AC side of the grid side conversion module is connected to the grid side of the wind power converter through the grid side frame circuit breaker.

[0046] One end of the stator side switch is connected to the stator of the generator, and the other end of the stator side switch is connected to the AC side of the grid side conversion module.

[0047] One end of the slow start branch is connected to the grid side of the wind power converter, and the other end of the slow start branch is connected to the connection point of the machine side conversion module and the grid side conversion module.

[0048] The controller is connected to the machine side conversion module, the grid side conversion module, the slow start branch, the grid side frame circuit breaker, the stator side switch, and the main control system of the wind power generator, respectively.

[0049] The fifth aspect of the present application provides a power generation system, characterized in that comprising: a wind power generator, a wind power converter, and a transformer; wherein:

[0050] The grid side of the wind power converter is connected to the primary side of the transformer, and the secondary side of the transformer is connected to the power grid.

[0051] The wind power converter is the wind power converter according to the third aspect of the present application or the fourth aspect of the present application.

[0052] The main control system of the wind power generator or the controller in the wind power converter is used to execute the control method of the grid side frame circuit breaker according to any one of the second aspect of the present application.

[0053] From the above technical solutions, the application provides a grid-side frame circuit breaker. In the grid-side frame circuit breaker, the main structure and the under-voltage release are connected in series, two ends of the series branch are respectively used as two ends of the grid-side frame circuit breaker, the under-voltage release switch is arranged in a power supply circuit of the under-voltage release, and the under-voltage release switch is controlled by a superior controller. Since the under-voltage release switch is closed when a wind power converter in which the grid-side frame circuit breaker is located starts, the under-voltage release switch is opened, that is, the under-voltage release is tripped, before the wind power converter starts, that is, when the wind power converter is in a fault-free standby state, so that a path is not formed between the two ends of the grid-side frame circuit breaker at all, and the grid-side frame circuit breaker cannot be manually closed, and thus the grid-side frame circuit breaker can be prevented from being mistakenly closed when the wind power converter is in the fault-free standby state. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute the embodiments of the application, and for those skilled in the art, other drawings can also be obtained based on the provided drawings without creative labor.

[0055] Figure 1 and Figure 2 are respectively structural schematic diagrams of two kinds of embodiments of the grid-side frame circuit breaker provided by the embodiments of the application;

[0056] Figure 3 and Figure 4 are respectively structural schematic diagrams of two kinds of specific embodiments of the main structure 10 provided by the embodiments of the application;

[0057] Figure 5 and Figure 6 are respectively flowcharts of two kinds of specific embodiments of the control method of the grid-side frame circuit breaker provided by the embodiments of the application;

[0058] Figure 7 is a flowchart of one specific embodiment of the step S210 provided by the embodiments of the application;

[0059] Figure 8 and Figure 9 are respectively structural schematic diagrams of two kinds of wind power converters provided by the embodiments of the application;

[0060] Figure 10 is a structural schematic diagram of a power generation system provided by the embodiments of the application. DETAILED DESCRIPTION

[0061] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort are within the protection scope of the present application.

[0062] In the present application, the relational terms such as first and second and the like are used only to differentiate one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, preclude the existence of additional identical elements in the process, method, article or apparatus that comprises the element.

[0063] In order to avoid mis-closing the grid-side frame circuit breaker when the wind power converter is in fault standby, the present application provides a grid-side frame circuit breaker, which is arranged in a wind power converter connected with a wind turbine; the specific structure of the grid-side frame circuit breaker is shown in Figure 1 (only one under-voltage release switch Sq is taken as an example for illustration) and specifically comprises a main structure 10, an under-voltage release 20, an energy storage motor 30 and at least one under-voltage release switch Sq.

[0064] The number of under-voltage release switches Sq can be selected according to actual requirements, which is not specifically limited here and is within the protection scope of the present application.

[0065] Preferably, the under-voltage release switch Sq is a relay; in actual application, it includes but is not limited to this, which is not specifically limited here and can be determined according to specific conditions, which is within the protection scope of the present application.

[0066] The connection relationship between the devices is described as follows:

[0067] The main contact 11 in the main structure 10 is connected in series with the under-voltage release 20, and the two ends of the series branch are respectively used as the two ends of the grid-side frame circuit breaker; the power supply end of the energy storage motor 30, the power supply end of the under-voltage release 20 and the power supply end of the main structure 10 are connected with the power supply end of the grid-side frame circuit breaker.

[0068] The under-voltage release switch Sq is arranged in a power supply circuit of the under-voltage release 20; specifically, the under-voltage release switch Sq is arranged between a positive power supply end of the under-voltage release 20 and a positive power supply end of the grid-side frame circuit breaker, or between a negative power supply end of the under-voltage release 20 and a negative power supply end of the grid-side frame circuit breaker; the above are only two arrangement modes of the under-voltage release switch Sq, and in actual application, the arrangement mode can be selected according to actual conditions, which is not limited here and is within the protection scope of the present application.

[0069] The control end of the main structure 10 is connected with the control end of the under-voltage release switch Sq, and the connection point is used as a control end of the grid-side frame circuit breaker, which is connected with a superior controller.

[0070] Optionally, the superior controller can be a controller in the wind power converter or a main control system in the wind turbine; in actual application, the superior controller can be selected according to actual conditions, which is not limited here and is within the protection scope of the present application.

[0071] Functions of each device are as follows:

[0072] The under-voltage release switch Sq is closed when the wind power converter starts to start, that is, the under-voltage release switch Sq is closed when the wind power converter is in a fault-free standby state, and is opened when the wind turbine has a shutdown requirement, so that the under-voltage release 20 is powered when the wind power converter is in a fault-free standby state, and is powered off when the wind turbine has a shutdown requirement.

[0073] The under-voltage release 20 is tripped when power is lost, and cuts off the path formed between the two ends of the grid-side frame circuit breaker; the under-voltage release 20 is closed when power is supplied, and forms a path between the two ends of the grid-side frame circuit breaker.

[0074] The main structure 10 is closed after the wind power converter is successfully started, and is tripped when the wind turbine fails.

[0075] In the embodiment, since the under-voltage release switch Sq is closed when the wind power converter starts to start, the under-voltage release switch Sq is opened, that is, the under-voltage release 20 is tripped, before the wind power converter starts, that is, when the wind power converter is in a fault-free standby state, so that the path between the two ends of the grid-side frame circuit breaker is always not formed, and the grid-side frame circuit breaker cannot be manually closed, and thus the grid-side frame circuit breaker can be prevented from being mistakenly closed when the wind power converter is in a fault-free standby state.

[0076] Another embodiment of the present application provides another implementation of the grid-side frame circuit breaker, and a specific structure thereof is shown in Figure 2 The implementation is based on the above embodiment and further includes at least one emergency and safety chain switch Sa.

[0077] The number of the emergency stop and safety chain switch Sa can be selected according to actual conditions, and is not specifically limited herein, and is within the protection scope of the present application.

[0078] Preferably, the emergency stop and safety chain switch Sa is a relay. In actual application, the emergency stop and safety chain switch Sa is not limited to this, and can be selected according to actual conditions, and is within the protection scope of the present application.

[0079] The emergency stop and safety chain switch Sa is arranged in a power supply loop of the under-voltage release 20. Specifically, the emergency stop and safety chain switch Sa is arranged between a positive power supply end of the under-voltage release 20 and a positive power supply end of the grid-side frame circuit breaker, or between a negative power supply end of the under-voltage release 20 and a negative power supply end of the grid-side frame circuit breaker. The above is only two arrangement modes of the emergency stop and safety chain switch Sa, and the emergency stop and safety chain switch Sa can be selected according to actual conditions, and is within the protection scope of the present application.

[0080] In use, the control end of the emergency stop and safety chain switch Sa is connected to a safety chain in the wind turbine generator.

[0081] When the safety chain in the wind turbine generator is powered off, the emergency stop and safety chain switch Sa is opened. When the safety chain in the wind turbine generator is powered on, the emergency stop and safety chain switch Sa is closed.

[0082] It should be noted that the safety chain in the wind turbine generator, also known as a safety protection system, is a relatively mature technology in the prior art, and will not be described herein.

[0083] In the embodiment, since the added emergency stop and safety chain switch Sa is directly connected to the safety chain in the wind turbine generator, even if the control of the upper controller fails, the grid-side frame circuit breaker provided by the embodiment can still be opened when needed, thereby improving the reliability of the grid-side frame circuit breaker.

[0084] Another embodiment of the present application provides a specific implementation of the main structure 10, and the specific structure is as shown in Figure 3 The main structure 10 specifically includes a main contact 11, a closing control circuit 12, and an opening control circuit 13. The connection relationship between the devices is described as follows.

[0085] The two ends of the main contact 11 are respectively used as the two ends of the main structure 10.

[0086] The control end of the closing control circuit 12 and the control end of the opening control circuit 13 are connected to the control end of the grid-side frame circuit breaker, and the control end of the grid-side frame circuit breaker is connected to the upper controller 01. The power supply end of the closing control circuit 12 and the power supply end of the opening control circuit 13 are connected to the power supply end of the main structure 10.

[0087] It should be noted that the different embodiments of the upper controller 01 have been described in detail in the above embodiments, and will not be described here.

[0088] When the wind power converter is successfully started, the closing control circuit 12 makes the main contact 11 attract, that is, the main structure 10 is closed; when the wind turbine fails, the opening control circuit 13 makes the main contact 11 open, that is, the main structure 10 is opened.

[0089] In this embodiment, the specific structure of the closing control circuit 12 is as shown in Figure 4 (only one closing switch Sh is taken as an example for display in the figure) and specifically includes a closing coil 121 and at least one closing switch Sh.

[0090] The number of closing switches Sh can be selected according to actual conditions, which is not specifically limited here and is within the protection scope of the present application.

[0091] Preferably, the closing switch Sh is a relay; in actual application, it includes but is not limited to this, which is not specifically limited here and can be determined according to specific conditions, which is within the protection scope of the present application.

[0092] The power supply end of the closing coil 121 is connected with the power supply end of the closing control circuit 12; the closing switch Sh is arranged between the positive electrode of the power supply end of the closing coil 121 and the positive electrode of the power supply end of the closing control circuit 12, or between the negative electrode of the power supply end of the closing coil 121 and the negative electrode of the power supply end of the closing control circuit 12.

[0093] In this embodiment, the specific structure of the opening control circuit 13 is as shown in Figure 4 (only one closing switch Sh is taken as an example for display in the figure) and specifically includes an opening coil 131 and at least one opening switch Sf.

[0094] The number of opening switches Sf can be selected according to actual conditions, which is not specifically limited here and is within the protection scope of the present application.

[0095] Preferably, the opening switch Sf is a relay; in actual application, it includes but is not limited to this, which is not specifically limited here and can be determined according to specific conditions, which is within the protection scope of the present application.

[0096] The power supply end of the opening coil 131 is connected with the power supply end of the opening control circuit 13; the opening switch Sf is arranged between the positive electrode of the power supply end of the opening coil 131 and the positive electrode of the power supply end of the opening control circuit 13, or between the negative electrode of the power supply end of the opening coil 131 and the negative electrode of the power supply end of the opening control circuit 13.

[0097] In the closing control circuit 12 and the opening control circuit 13, when the wind power converter is successfully started slowly, the closing switch Sh is closed, the opening switch Sf is opened, that is, the closing coil 121 is powered, the opening coil 131 is powered off, so that the main contact 11 is attracted; when the wind turbine fails, the opening switch Sf is closed, the closing switch Sh is opened, that is, the opening coil 131 is powered, the closing coil 121 is powered off, so that the main contact 11 is opened.

[0098] The above is only one specific embodiment of the main structure 10, and in actual application, includes but is not limited to this, as long as the same function can be realized, and this is not limited, and is within the protection scope of the application.

[0099] Another embodiment of the application provides a control method of a grid-side frame circuit breaker, wherein the grid-side frame circuit breaker is the grid-side frame circuit breaker provided in the above embodiment, the grid-side frame circuit breaker is arranged in a wind power converter, the wind power converter is connected with a wind turbine; the specific process of the control method is as shown in Figure 5 The specific process of the control method is as shown in

[0100] S110, judging whether the wind power converter starts.

[0101] If the wind turbine starts, the step S120 and the step S130 are executed in sequence; if the wind turbine does not start, the step S110 is returned to execute.

[0102] In actual application, when the wind turbine starts, the main control system in the wind turbine will issue a start instruction to the wind power converter, and the wind power converter starts when receiving the start instruction, therefore, whether the wind power converter starts can also be judged by judging whether the wind power converter receives the start instruction, or whether the wind power converter starts can also be judged by judging whether the wind turbine starts.

[0103] S120, controlling the under-voltage release in the grid-side frame circuit breaker to close.

[0104] Specifically, the under-voltage release is controlled to close by controlling the under-voltage release in the grid-side frame circuit breaker to close; the specific process has been described in the above embodiment, and will not be repeated here.

[0105] S130, judging whether the wind power converter is successfully started slowly.

[0106] If the wind power converter is successfully started slowly, the step S140 is executed; if the wind power converter is not successfully started slowly, the step S130 is returned to execute.

[0107] The successful slow start refers to that the wind power converter completes the slow start and establishes a normal voltage value between the DC side capacitors of the grid-side module.

[0108] S140, control the main structure in the grid side frame circuit breaker to close.

[0109] Specifically, by controlling the closing switch to close and the opening switch to open in the main structure, the main structure in the grid side frame circuit breaker can be controlled. The specific process has been described in the above embodiment, which will not be repeated here.

[0110] Another embodiment of the application provides another embodiment of the control method of the grid side frame circuit breaker, and the specific process is as shown in the following figure Figure 6

[0111] S210, determine whether the wind turbine has shutdown demand.

[0112] If the wind turbine has shutdown demand, step S220 is executed; if the wind turbine does not have shutdown demand, step S210 is returned to execute.

[0113] The embodiment provides a specific embodiment of step S210, and the specific process is as shown in the following figure Figure 7

[0114] S310, respectively determine whether the wind turbine has failure and whether the wind turbine receives shutdown instruction.

[0115] If the wind turbine does not receive shutdown instruction and does not have failure, step S320 is executed; if the wind turbine receives shutdown instruction and / or has failure, step S330 is executed.

[0116] S320, determine that the wind turbine does not have shutdown demand.

[0117] S330, determine that the wind turbine has shutdown demand.

[0118] Optionally, the order of the two determinations in step S310 can be to determine whether the wind turbine has failure first, and then determine whether the wind turbine receives shutdown instruction; or to determine whether the wind turbine receives shutdown instruction first, and then determine whether the wind turbine has failure; which is not limited here, and can be determined according to the specific situation, and is within the protection scope of the application.

[0119] S220, control the main structure in the grid side frame circuit breaker to open, and control the under-voltage release to open.

[0120] ​​Specifically, by controlling the closing switch in the main structure to be open and the opening switch to be closed, the main structure in the grid-side frame circuit breaker can be controlled to be opened; by controlling the under-voltage release switch in the grid-side frame circuit breaker to be open, the under-voltage release can be controlled to be opened; the specific process has been described in the above embodiment, and thus will not be described here again.

[0121] Another embodiment of the present application provides a wind power converter, the specific mechanism of which is shown in Figure 8 The wind power converter specifically comprises a machine-side conversion module 210, a grid-side conversion module 220, a soft-start branch 230, a controller 240 and a grid-side frame circuit breaker 250 provided in the above embodiment; the connection relationship between the devices is described as follows:

[0122] The generator in the wind power generator is a full-power generator.

[0123] The AC side of the machine-side conversion module 210 is connected to the rotor of the generator in the wind power generator, the DC side of the machine-side conversion module 210 is connected to the DC side of the grid-side conversion module 220, and the AC side of the grid-side conversion module 220 is connected to the grid side of the wind power converter through the grid-side frame circuit breaker 250.

[0124] One end of the soft-start branch 230 is connected to the grid side of the wind power converter, and the other end of the soft-start branch 230 is connected to the connection point of the machine-side conversion module 210 and the grid-side conversion module 220; the controller 240 is connected to the machine-side conversion module 210, the grid-side conversion module 220, the soft-start branch 230, the grid-side frame circuit breaker 250 and the main control system of the wind power generator respectively.

[0125] It should be noted that, in the present embodiment, the wind power converter is only replaced by the grid-side frame circuit breaker 250 provided in the above embodiment compared with the prior art, and thus the structure and working principle thereof are the same as those of the prior art, and thus will not be described here again; in addition, a DC conversion module can also be added to the wind power converter in the present embodiment, so that the wind power converter becomes a wind storage converter, and the connection mode of the DC conversion module is the same as that in the prior art, and thus will not be described here again.

[0126] Another embodiment of the present application provides a wind power converter, the specific mechanism of which is shown in Figure 9 The wind power converter specifically comprises a machine-side conversion module 210, a grid-side conversion module 220, a soft-start branch 230, a stator-side switch 260, a controller 240 and a grid-side frame circuit breaker 250 provided in the above embodiment; the connection relationship between the devices is described as follows:

[0127] The generator in the wind power generator is a double feedback generator.

[0128] The AC side of the machine-side conversion module 210 is connected with the rotor of the generator in the wind turbine generator, the DC side of the machine-side conversion module 210 is connected with the DC side of the grid-side conversion module 220, and the AC side of the grid-side conversion module 220 is connected with the grid side of the wind power converter through the grid-side frame circuit breaker 250.

[0129] One end of the stator-side switch 260 is connected with the stator of the generator, and the other end of the stator-side switch 260 is connected with the AC side of the grid-side conversion module 220.

[0130] One end of the soft-start branch 230 is connected with the grid side of the wind power converter, and the other end of the soft-start branch 230 is connected with the connection point of the machine-side conversion module 210 and the grid-side conversion module 220; the controller 240 is connected with the machine-side conversion module 210, the grid-side conversion module 220, the soft-start branch 230, the grid-side frame circuit breaker 250, the stator-side switch 260 and the main control system of the wind turbine generator respectively.

[0131] It should be noted that, in the embodiment, the wind power converter is compared with the prior art, and only the grid-side frame circuit breaker 250 is replaced by the grid-side frame circuit breaker 250 provided in the above embodiment, so that the structure and working principle are the same as those of the prior art, and details are not repeated here; in addition, a DC conversion module can also be added to the wind power converter in the embodiment, so that it becomes a wind storage converter, and the connection mode of the DC conversion module is the same as that in the prior art, so details are not repeated here.

[0132] Another embodiment of the present application provides a power generation system, and the specific structure is shown in Figure 10 The power generation system specifically comprises a wind turbine generator 310, a wind power converter 320 and a transformer 330; and the connection relationship between the devices is as follows:

[0133] The grid side of the wind power converter 320 is connected with the primary side of the transformer 330, and the secondary side of the transformer 330 is connected with a power grid 340; the wind power converter 320 is the wind power converter 320 provided in any one of the above embodiments.

[0134] It should be noted that the connection relationship between the wind power converter 320 and the wind turbine generator 310 has been described in detail in the above embodiments, and details are not repeated here.

[0135] The controller 240 in the wind power converter 320 can execute the control method of the grid-side frame circuit breaker 250 provided in the above embodiments, or the main control system of the wind turbine generator 310 can execute the control method of the grid-side frame circuit breaker 250 provided in the above embodiments; details are not limited here, and can be determined according to specific conditions, and are within the protection scope of the present application.

[0136] It should be noted that the power generation system in the embodiment controls the grid-side frame circuit breaker 250, and the rest of the working principle is the same as the prior art, which will not be described here.

[0137] In the above description of the disclosed embodiments, the features described in the embodiments in the specification can be replaced or combined with each other, so that those skilled in the art can implement or use the present application. The above description is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as the above preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make many possible changes and modifications to the disclosed method and technical content of the present application without departing from the scope of the technical solution of the present application, or modify it as equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not deviate from the content of the technical solution of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. A network side frame circuit breaker, characterized by, The grid-side frame circuit breaker is arranged in a wind power converter; the grid-side frame circuit breaker comprises a main structure, an under-voltage release and at least one under-voltage release switch; wherein: the main contact in the main structure is connected in series with the under-voltage release, and the two ends of the series branch are respectively used as the two ends of the grid-side frame circuit breaker; the under-voltage release switch is arranged in a power supply loop of the under-voltage release; the under-voltage release switch is controlled by a superior controller and is used for being closed when the wind power converter starts to start; when the wind power converter is in a fault-free standby state, the under-voltage release switch is opened.

2. The network side frame circuit breaker of claim 1, wherein, Further comprising: at least one emergency stop and safety chain switch; wherein: the emergency stop and safety chain switch is arranged in the power supply loop of the under-voltage release; the control end of the emergency stop and safety chain switch is connected to a safety chain in a wind turbine connected with the wind power converter, and the emergency stop and safety chain switch is used for being opened when the safety chain is powered off and being closed when the safety chain is powered on.

3. The network side frame circuit breaker of claim 1, wherein, the main structure comprises the main contact, a closing control circuit and an opening control circuit; wherein: the two ends of the main contact are respectively used as the two ends of the main structure; the closing control circuit is controlled by a superior controller and makes the main contact be attracted when the wind power converter successfully starts to start; the opening control circuit is controlled by a superior controller and makes the main contact be opened when a fault occurs in the wind turbine connected with the wind power converter.

4. The network side frame circuit breaker of claim 3, wherein, the closing control circuit comprises a closing coil and at least one closing switch; wherein: the power supply end of the closing coil is connected with the power supply end of the closing control circuit; the closing switch is arranged between the positive electrode of the power supply end of the closing coil and the positive electrode of the power supply end of the closing control circuit, or between the negative electrode of the power supply end of the closing coil and the negative electrode of the power supply end of the closing control circuit.

5. The network side frame circuit breaker of claim 3, wherein, the opening control circuit comprises an opening coil and at least one opening switch; wherein: the power supply end of the opening coil is connected with the power supply end of the opening control circuit; the opening switch is arranged between the positive electrode of the power supply end of the opening coil and the positive electrode of the power supply end of the opening control circuit, or between the negative electrode of the power supply end of the opening coil and the negative electrode of the power supply end of the opening control circuit.

6. The network side frame circuit breaker according to any one of claims 1 to 5, characterized in that, Each switch is a relay.

7. A control method of a network side frame circuit breaker, characterized by, The grid-side frame circuit breaker is the grid-side frame circuit breaker as claimed in any one of claims 1 to 6, and the grid-side frame circuit breaker is arranged in a wind power converter; the control method comprises: judging whether the wind power converter starts to start; if the wind power converter starts to start, controlling the under-voltage release in the grid-side frame circuit breaker to be closed; judging whether the wind power converter successfully starts to start; if the wind power converter successfully starts to start, controlling the main structure in the grid-side frame circuit breaker to be closed.

8. The control method of the network side frame circuit breaker according to claim 7, characterized by, After the main structure in the grid-side frame circuit breaker is controlled to be closed, further comprising: judging whether the wind turbine connected with the wind power converter has a shutdown demand; if the wind turbine has a shutdown demand, controlling the main structure in the grid-side frame circuit breaker to be opened and controlling the under-voltage release to be opened.

9. The control method of the network side frame circuit breaker according to claim 7, characterized by, judging whether the wind turbine connected with the wind power converter has a shutdown requirement, comprising: respectively judging whether the wind turbine has a fault or receives a shutdown instruction; if no shutdown instruction is received and the wind turbine has no fault, determining that the wind turbine has no shutdown requirement; if a shutdown instruction is received and / or the wind turbine has a fault, determining that the wind turbine has a shutdown requirement.

10. A wind power converter, characterized in that comprising: a machine side conversion module, a grid side conversion module, a slow start branch, a controller and the grid side frame circuit breaker according to any one of claims 1 to 6; wherein: the generator in the wind turbine is a full power generator; the AC side of the machine side conversion module is connected with the rotor of the generator in the wind turbine, the DC side of the machine side conversion module is connected with the DC side of the grid side conversion module, and the AC side of the grid side conversion module is connected with the grid side of the wind power converter through the grid side frame circuit breaker; one end of the slow start branch is connected with the grid side of the wind power converter, and the other end of the slow start branch is connected with the connection point of the machine side conversion module and the grid side conversion module; the controller is connected with the machine side conversion module, the grid side conversion module, the slow start branch, the grid side frame circuit breaker and the main control system of the wind turbine respectively.

11. A wind power converter, characterized in that comprising: a machine side conversion module, a grid side conversion module, a slow start branch, a stator side switch, a controller and the grid side frame circuit breaker of the wind power converter according to any one of claims 1 to 6; wherein: the generator in the wind turbine is a double feedback generator; the AC side of the machine side conversion module is connected with the rotor of the generator in the wind turbine, the DC side of the machine side conversion module is connected with the DC side of the grid side conversion module, and the AC side of the grid side conversion module is connected with the grid side of the wind power converter through the grid side frame circuit breaker; one end of the stator side switch is connected with the stator of the generator, and the other end of the stator side switch is connected with the AC side of the grid side conversion module; one end of the slow start branch is connected with the grid side of the wind power converter, and the other end of the slow start branch is connected with the connection point of the machine side conversion module and the grid side conversion module; the controller is connected with the machine side conversion module, the grid side conversion module, the slow start branch, the grid side frame circuit breaker, the stator side switch and the main control system of the wind turbine respectively.

12. A power generation system characterized by comprising: comprising: a wind turbine, a wind power converter and a transformer; wherein: the grid side of the wind power converter is connected with the primary side of the transformer, and the secondary side of the transformer is connected with the power grid; the wind power converter is the wind power converter according to claim 10 or 11; the main control system of the wind turbine or the controller in the wind power converter is configured to execute the control method of the grid side frame circuit breaker according to any one of claims 7 to 9.

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