Driving system, turning system and wind generating set

Abstract

The invention provides a driving system, a turning system and a wind generating set, and the driving system comprises a converter cabinet which comprises a first converter and a second converter, and each of the first converter and the second converter comprises a machine-side converter and a grid-side converter which are connected through a DC bus; the grid-side circuit is connected between a grid-side converter of the first converter and a grid-connected point of the wind generating set; the barring circuit is used for connecting one ends, far away from each other, of the grid-side converter and the machine-side converter of the first converter; the first bus circuit and the second bus circuit are connected between the positive direct-current bus of the first converter and the positive direct-current bus of the second converter and between the negative direct-current bus of the first converter and the negative direct-current bus of the second converter respectively, the driving system has a turning mode and a grid-connected mode, in the turning mode, the grid-side circuit is disconnected, and in the grid-connected mode, the grid-side circuit is disconnected; and the turning circuit, the first bus circuit and the second bus circuit are conducted and are opposite in a grid-connected mode. According to the invention, the additional tool cost is obviously reduced, and the cost of the whole machine can be controlled.

Description

Technical Field

[0001] The present disclosure relates to the field of wind power generation, and more specifically, to a driving system, a winch system and a wind power generator set. Background Art

[0002] With the rapid development of offshore wind power generation technology in my country, offshore wind power has also developed rapidly, and the technology has become increasingly mature. Due to the large diameter of the impeller and limited ship resources, there are few hoisting ships that can meet the installation of three blades in offshore wind turbines. At present, mechanical winches are usually used to install horizontal single blades to achieve blade hoisting. Specifically, the first step is to use the winch to rotate the hub so that one blade mounting hole is in a horizontal position, and lock the hub, and then install the first blade horizontally. The second step is to unlock it, use the winch to rotate the hub counterclockwise (or clockwise) 120°, so that the other blade mounting hole is in a horizontal position, lock the hub again, and then install the second blade horizontally, and then repeat the second step to install the third blade. However, the cost of mechanical winches is relatively high, about 3 million per set, and the mechanical winch occupies the cabin space, and additional access to the cabin needs to be reserved, which will increase the cost of the whole machine by about 200,000 per unit. In order to meet the cost reduction target of units in the era of parity, it is necessary to reduce the cost of the entire unit, make full use of the existing equipment of the unit for turning drive, and reduce or eliminate additional tooling development costs.

[0003] Although the generator of the existing unit can theoretically be used as an electric motor to drive the impeller to rotate, for safety reasons, the hub needs to rotate more slowly when the blades are adjusted. Moreover, when one or two blades have been installed, the motor needs to have a large enough driving torque to drive the hub to rotate due to the offset of the impeller's center of gravity. Therefore, the inverter needs to output a large enough current stably for a long time to drive the motor to rotate slowly for a long time. This is something that the inverter of the existing unit cannot do. As a result, when using an electric winch system, an additional motor or inverter is still required, resulting in higher additional tooling costs. Summary of the invention

[0004] Therefore, it is crucial to reduce or eliminate the additional tooling costs of the electric turning system.

[0005] In a general aspect, a drive system is provided for driving a motor of a winch system of a wind turbine generator set, the drive system comprising: a converter cabinet, comprising a first converter and a second converter, the first converter and the second converter both comprising a machine-side converter and a grid-side converter connected via a DC bus, the machine-side converter being connected to the motor of the winch system, the grid-side converter being directly or indirectly connected to a grid-connected point of the wind turbine generator set; a grid-side circuit being connected between the grid-side converter of the first converter and the grid-connected point of the wind turbine generator set, so that the grid-side converter of the first converter is indirectly connected to the grid-connected point via the grid-side circuit; a winch circuit A circuit connects the grid-side converter and the machine-side converter of the first converter at ends away from each other; a first bus circuit is connected between the positive DC bus of the first converter and the positive DC bus of the second converter; and a second bus circuit is connected between the negative DC bus of the first converter and the negative DC bus of the second converter, wherein the drive system has a cranking mode and a grid-connected mode, in which the grid-side circuit is disconnected, and the cranking circuit, the first bus circuit and the second bus circuit are turned on, and in the grid-connected mode, the grid-side circuit is turned on, and the cranking circuit, the first bus circuit and the second bus circuit are disconnected.

[0006] Optionally, the drive system further includes: a machine-side auxiliary circuit, connecting the machine-side converter of the first converter with the machine-side converter of the second converter, the machine-side auxiliary circuit being turned on in the cranking mode and turned off in the grid-connected mode.

[0007] Optionally, the number of the converter cabinet is at least one.

[0008] Optionally, when the number of the converter cabinets is greater than or equal to two, the DC busbars of the converter cabinets are connected in parallel to each other in the cranking mode.

[0009] In another general aspect, a winch system for a wind turbine generator set is provided, the winch system comprising: an electric motor for driving an impeller of the wind turbine generator set to rotate during the process of hoisting the wind turbine generator set; and a drive system provided by any one of the above embodiments.

[0010] Optionally, the electric motor comprises a generator of the wind turbine generator set.

[0011] Optionally, the turning gear system further comprises: a control system connected to a converter cabinet of the driving system and used for controlling the rotation position of the motor.

[0012] Optionally, the control system includes a position controller, a speed controller, a torque controller and a current controller connected in sequence, and the current controller is connected to the converter cabinet.

[0013] Optionally, the control system is also used to control the motor to rotate in the opposite direction to stop the impeller from rotating; and / or the turning system also includes a mechanical braking system, including a brake locking system of the motor and a braking system of the impeller.

[0014] In another general aspect, a wind turbine generator set is provided, comprising: an impeller; and a winch system provided in any one of the above embodiments, wherein the winch system is used to drive the impeller of the wind turbine generator set to rotate to a set position during the process of hoisting the wind turbine generator set.

[0015] The present disclosure proposes a drive system, a winch system and a wind turbine generator set, which improve the existing grid-connected structure of the wind turbine generator set as the drive system, specifically, the machine-side converters of the first converter and the second converter are connected to the motor of the winch system, so that the motor is driven by the first converter and the second converter, and a grid-side circuit is set between the grid-side converter of the first converter and the grid-connected point of the wind turbine generator set, a winch circuit is added between the ends of the grid-side converter and the machine-side converter of the first converter that are away from each other, and a bus circuit (specifically including a first bus circuit and a second bus circuit) is added between the DC buses of the first converter and the second converter. By changing the on-off states of the above circuits, the drive system can have two working modes, a winch mode and a grid-connected mode, so that in the winch mode, the electric energy of the grid is used to drive the motor to rotate to realize electric winch, and in the grid-connected mode, the drive system is restored to a conventional grid-connected function to transfer the electric energy generated by the wind turbine generator set to the grid. In the cranking mode, by disconnecting the grid-side circuit and turning on the cranking circuit, both the machine-side converter and the grid-side converter of the first converter can be connected to the motor, realizing dual converter drive and enhancing the output current capacity of the first converter; at the same time, the second converter is connected between the motor and the grid connection point. On the one hand, the second converter can use the grid as power supply to provide part of the driving current to the motor. On the other hand, by turning on the bus circuit, the DC bus of the first converter can be connected in parallel with the DC bus of the second converter, so that the converter cabinet is transformed from dual-bus operation to single-bus operation. The second converter is used to transfer the power of the power grid to the first converter, so that the first converter can operate, thereby providing a stable and large driving current to the motor for a long time, ensuring the long-term slow rotation of the motor. It is achieved that an electrified winch system can be obtained by simply adding circuits and changing the wiring method. The tooling cost of the winch drive has been reduced from 3 million to nearly 0, which significantly reduces the additional tooling cost. In addition, there is no need to occupy a large amount of cabin space like setting up a mechanical winch, which reduces the cost of the whole machine by about 200,000 per unit, which helps to control the cost of the whole machine.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects and features of the present invention will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a topological diagram showing a wind turbine generator set according to an embodiment of the present disclosure when the drive system is in a cranking mode;

[0019] Figure 2is a topological diagram showing a wind turbine generator set according to an embodiment of the present disclosure when the drive system is in a grid-connected mode;

[0020] Figure 3 is a topological diagram showing a wind turbine generator set according to another embodiment of the present disclosure when the drive system is in a cranking mode;

[0021] Figure 4 is a control logic schematic diagram showing a control system according to one embodiment of the present disclosure.

[0022] Figures 1 to 4 Description of Figure Numbers:

[0023] 10: drive system; 11: converter cabinet; 111: first converter; 1111: machine-side converter; 1112: grid-side converter; 112: second converter; 12: grid-side circuit; 13: turning circuit; 14: first bus circuit; 15: second bus circuit; 16: machine-side auxiliary circuit; 17: third bus circuit; 18: fourth bus circuit; 20: control system. DETAILED DESCRIPTION

[0024] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be clear. For example, the order of operations described herein is only an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present application, except for operations that must occur in a specific order. In addition, for greater clarity and simplicity, the description of features known in the art may be omitted.

[0025] The features described herein can be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will be clear after understanding the disclosure of the present application.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.

[0027] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions should not be limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer, or first portion referred to in the examples may also be referred to as the second member, second component, second region, second layer, or second portion.

[0028] In the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, or “coupled to” another element, the element may be directly “on”, “connected to”, or “coupled to” another element, or one or more other elements may be present therebetween. Conversely, when an element is described as being “directly on”, “directly connected to”, or “directly coupled to” another element, there may be no other elements present therebetween.

[0029] The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprise", "include" and "have" indicate the presence of the described features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0030] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by a person of ordinary skill in the art to which the present disclosure belongs after understanding the present disclosure. Unless explicitly defined as such herein, terms (such as those defined in a general dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal manner.

[0031] Furthermore, in the description of examples, when it is considered that a detailed description of a well-known related structure or function would cause vague interpretation of the present disclosure, such a detailed description will be omitted.

[0032] The following will be combined Figures 1 to 4 The drive system 10, the turning gear system and the wind turbine generator set provided in the embodiments of the present disclosure are introduced.

[0033] like Figure 1 and Figure 2As shown, an embodiment of one aspect of the present disclosure provides a drive system 10 for driving the motor G of the cranking system of a wind turbine generator set. As an example, the motor G is a permanent magnet synchronous motor. The drive system 10 includes a converter cabinet 11, a grid-side circuit 12, a cranking circuit 13, a first bus circuit 14 and a second bus circuit 15. The converter cabinet 11 includes a first converter 111 and a second converter 112. The first converter 111 and the second converter 112 both include a machine-side converter and a grid-side converter connected via a DC bus, such as the machine-side converter 1111 and the grid-side converter 1112 of the first converter 111 marked in the figure. The figure also uses DC+ to represent the positive DC bus and DC- to represent the negative DC bus. The machine-side converter is connected to the motor G of the cranking system, and the grid-side converter is directly or indirectly connected to the grid connection point of the wind turbine generator set. As an example, in the case where the wind turbine generator set is provided with a transformer, the high-voltage side node of the transformer serves as the grid connection point of the wind turbine generator set. As Figure 2 As shown, the grid-side circuit 12 is connected between the grid-side converter of the first converter 111 and the grid connection point of the wind turbine generator set, so that the grid-side converter of the first converter 111 is indirectly connected to the grid connection point via the grid-side circuit 12. The cranking circuit 13 connects the ends of the grid-side converter and the machine-side converter of the first converter 111 that are away from each other. The first bus circuit 14 is connected between the positive DC bus of the first converter 111 and the positive DC bus of the second converter 112; the second bus circuit 15 is connected between the negative DC bus of the first converter 111 and the negative DC bus of the second converter 112. The drive system 10 has the following features: Figure 1 The cranking mode shown and Figure 2 In the grid-connected mode shown, in the cranking mode, the grid-side circuit 12 is disconnected ( Figure 1 The grid-side circuit 12 is deleted to show the state when the grid-side circuit 12 is disconnected), the cranking circuit 13, the first bus circuit 14 and the second bus circuit 15 are turned on. In the grid-connected mode, the grid-side circuit 12 is turned on, and the cranking circuit 13, the first bus circuit 14 and the second bus circuit 15 are disconnected ( Figure 2 The state when the cranking circuit 13 , the first bus circuit 14 , and the second bus circuit 15 are disconnected is shown in the form of deleting the cranking circuit 13 , the first bus circuit 14 , and the second bus circuit 15 ).

[0034] The drive system 10 provided in the embodiment of the present disclosure improves the existing grid-connected structure of the wind turbine generator set as the drive system 10, specifically, the machine-side converters of the first converter 111 and the second converter 112 are connected to the motor G of the turning system, so as to drive the motor G by using the first converter 111 and the second converter 112, and a grid-side circuit 12 is set between the grid-side converter of the first converter 111 and the grid-connected point of the wind turbine generator set, and between the ends of the grid-side converter of the first converter 111 and the machine-side converter that are far away from each other. By adding a cranking circuit 13 and adding a bus circuit (specifically including a first bus circuit 14 and a second bus circuit 15) between the DC buses of the first converter 111 and the second converter 112, the drive system 10 can have two working modes, namely a cranking mode and a grid-connected mode, by changing the on-off states of the above-mentioned circuits. In the cranking mode, the electric energy of the grid is used to drive the motor G to rotate, thereby realizing electric cranking. In the grid-connected mode, the drive system 10 can restore the normal grid-connected function and transmit the electric energy generated by the wind turbine to the grid.

[0035] Specifically, regarding the driving current required by the motor G that drives the winch system, due to the displacement of the center of gravity after installing one or two blades on the impeller under hoisting conditions, a larger torque is required to drive the impeller to rotate around the axis of its hub under hoisting conditions compared to the conditions with three blades installed (equivalent to driving the hub to rotate, and the rotation refers to 120°, 240° or 360° in a clockwise or counterclockwise direction). After simulation calculations, the motor G needs to have a torque of 22417kNm during hoisting to drive the hub to rotate, and the converter output steady-state maximum current capacity must be at least about 1.22 times the rated current to drive the hub to rotate slowly (0.2rpm). Therefore, the required operating condition for the electric winch is a speed of 0.2rpm, and the output current frequency of the machine-side converter is about 3.02Hz, which is an ultra-low frequency and high torque condition (the minimum access frequency of the direct-drive unit is about 3Hz). Under this condition, the output current capacity of the converter is greatly reduced. The main reason is that ultra-low frequency will cause the heat accumulation of power electronic devices to increase, exceeding the device's tolerance, resulting in limited device output capacity under low frequency. Therefore, the drive current and drive torque that the converter of the wind turbine can provide are small, and it is impossible to drive the hub to rotate under hoisting conditions.

[0036] In the cranking mode, the embodiment of the present disclosure can disconnect the connection between the grid-side converter of the first converter 111 and the grid connection point by disconnecting the grid-side circuit 12 and turning on the cranking circuit 13, for example Figure 1As shown, it can be disconnected from the grid side of the reactor and connected to a section of the machine-side converter of the first converter 111 away from the grid-side converter, so that the machine-side converter and the grid-side converter of the first converter 111 are both connected to the motor G, realizing dual converter drive, and enhancing the output current capability of the first converter 111; at the same time, the second converter 112 is connected between the motor G and the grid connection point. On the one hand, the second converter 112 can use the grid as a power source to provide part of the driving current to the motor G. On the other hand, by turning on the bus circuit, the DC bus of the first converter 111 can be connected in parallel with the DC bus of the second converter 112, so that the converter cabinet 11 is converted from double-bus operation to single-bus operation, thereby utilizing the second converter 1 12 transmits the electric energy of the power grid to the first converter 111, so that the first converter 111 can operate, thereby being able to provide a stable and large driving current to the motor G for a long time under the hoisting condition (it has been measured that the driving current can be doubled), so that the output current capacity of the converter cabinet 11 is improved, which fully meets the requirement of 1.22 times the rated current, ensures the long-term slow rotation of the motor G, and realizes that an electrified winch system can be obtained by simply adding circuits and changing the wiring method. The tooling cost of the winch drive is reduced from 3 million to nearly 0, which significantly reduces the additional tooling cost, and there is no need to occupy a large amount of cabin space as in the case of setting up a mechanical winch, so the cost of the whole machine is reduced by about 200,000 per unit, which helps to control the cost of the whole machine.

[0037] As an example, in order to realize the on and off of each circuit, considering that the cranking mode usually operates in the installation stage of the wind turbine generator set, after the installation is completed and put into operation, it is usually switched to the grid-connected mode. The grid-side circuit 12 may not be connected to the drive system 10 during the installation stage, and the cranking circuit 13, the first bus circuit 14 and the second bus circuit 15 may be connected at the same time to make the drive system 10 run in the cranking mode; after the installation is completed, the grid-side circuit 12 is connected, and the cranking circuit 13, the first bus circuit 14 and the second bus circuit 15 are removed, which can not only reduce the total number of lines of the unit and simplify the structure in subsequent operation, but also can reuse the disassembled cranking circuit 13, the first bus circuit 14 and the second bus circuit 15 when installing other wind turbine generator sets, thereby improving material utilization and further reducing costs. Of course, a switch may be provided in the grid-side circuit 12, which is opened during the installation phase and closed after the installation is completed; switches may also be provided on the grid-side circuit 12, the turning circuit 13, the first bus circuit 14, and the second bus circuit 15, and the on-off state of each circuit may be changed by closing or opening the switch; other reasonable methods may also be used to change the on-off state of each circuit, which is not limited in the present disclosure.

[0038] Alternatively, if Figure 3As shown, the drive system 10 further includes a machine-side auxiliary circuit 16, which connects the machine-side converter of the first converter 111 with the machine-side converter of the second converter 112. The machine-side auxiliary circuit 16 is turned on in the cranking mode, as shown in FIG. Figure 2 As shown, it is disconnected in the grid-connected mode. By configuring the machine-side auxiliary circuit 16, the machine-side converters of the first converter 111 and the second converter 112 can be connected in parallel when the machine-side auxiliary circuit 16 is turned on, so that the first converter 111 and the second converter 112 provide a uniform drive current for the motor G, which helps to ensure the power supply stability. It should be understood that the on and off of the machine-side auxiliary circuit 16 can also be implemented in the manner given in the foregoing example, which will not be repeated here.

[0039] Optionally, the number of converter cabinets 11 is at least one, which means that no matter how many converter cabinets 11 are configured in the wind turbine generator set, they can be used to provide drive current for the motor G of the turning system, which not only expands the scope of application of the solution, but also helps to ensure sufficient and reliable current supply. It should be understood that the structures of the converter cabinets 11 are the same and can provide drive current independently. As an example, Figure 1 and Figure 2 As shown, there are two converter cabinets 11. Since each converter cabinet 11 includes two converters, a double-cabinet four-busbar structure can be formed. Four sets of independent busbars are connected to four sets of windings of the motor G through circuit breakers Q1, Q2, Q4, and Q5 respectively. The two circuit breakers Q3 and Q6 on the grid side of the converter cabinet 11 are connected in parallel to the low-voltage side of the transformer.

[0040] Optionally, when the number of converter cabinets 11 is greater than or equal to two, the DC busbars of each converter cabinet 11 are connected in parallel with each other in the cranking mode. By connecting the DC busbars of each independent converter cabinet 11 in parallel in the cranking mode, it is possible to ensure that each converter cabinet 11 has a uniform voltage, which helps to ensure power supply stability. As an example, in order to achieve the DC busbars of each converter cabinet 11 being connected in parallel with each other in the cranking mode, the drive system 10 may further include a third bus circuit 17 and a fourth bus circuit 18 arranged in pairs, and the number of the third bus circuit 17 and the fourth bus circuit 18 is one less than the number of the converter cabinets 11, so as to connect the DC busbars of each converter cabinet 11 in parallel with each other, for example, Figure 3As shown, the number of converter cabinets 11 is two, so a pair of third bus circuits 17 and fourth bus circuits 18 are provided. Specifically, each pair of third bus circuits 17 and fourth bus circuits 18 corresponds to two converter cabinets 11, the third bus circuit 17 is connected between the positive DC busbars of the corresponding two converter cabinets 11, and the fourth bus circuit 18 is connected between the negative DC busbars of the corresponding two converter cabinets 11. The third bus circuit 17 and the fourth bus circuit 18 are turned on in the cranking mode and turned off in the grid-connected mode. It should be understood that the turning on and off of the third bus circuit 17 and the fourth bus circuit 18 can also be implemented in the manner given as an example in the foregoing text, which will not be repeated here. It should be noted that, since the DC buses of the first converter 111 and the second converter 112 of each converter cabinet 11 are connected in parallel, when the DC buses of the two converter cabinets 11 are connected in parallel, one converter can be selected from each converter cabinet 11, and the DC buses of the converters selected from the converter cabinets 11 can be connected in parallel. Figure 3 For example, by adopting the principle of proximity, the second converter 112 of the two converter cabinets 11 close to each other is specifically selected, which can reduce line material consumption and reduce costs.

[0041] like Figures 1 to 3 As shown, an embodiment of another aspect of the present disclosure provides a winch system for a wind turbine generator set, the winch system comprising an electric motor G, for driving the impeller of the wind turbine generator set to rotate during the process of hoisting the wind turbine generator set; the winch system also comprises the drive system 10 provided in any of the above embodiments, and thus has all the beneficial technical effects of the drive system 10, which will not be repeated here.

[0042] Optionally, the motor G includes a generator of a wind turbine generator set, specifically, a generator of a wind turbine generator set where the current drive system 10 is located. The generator of the wind turbine generator set is connected to the hub, and its rotor can rotate synchronously with the hub. By using the generator of the wind turbine generator set as the motor G of the winch system, the existing equipment can be fully utilized to achieve winch, reducing additional costs. As an example, the motor G may also include a newly added motor G in addition to the generator of the wind turbine generator set. The newly added motor G is driven by the drive system 10 in the winch mode, and may not supply energy to the grid in the grid-connected mode.

[0043] Optionally, the turning system further includes a control system 20, which is connected to the converter cabinet 11 of the drive system 10 and is used to control the rotation position of the motor G. By configuring the control system 20 connected to the converter cabinet 11, the rotation position of the motor G can be controlled by controlling the driving current, thereby controlling the rotation position of the wheel hub, and realizing the electric turning.

[0044] Alternatively, if Figure 4As shown, the control system 20 includes a position controller, a speed controller, a torque controller and a current controller connected in sequence. jθ , current controller e jθ Connected to the converter cabinet 11, directly controls the operation of the converter cabinet 11. The converter cabinet 11 uses the grid as a power source and relies on the energy provided by the power source to control the current controller e jθ The control driving motor G is operated. By configuring four controllers connected in sequence to realize the control of the converter cabinet 11, the converter cabinet 11 can achieve the servo control function, thereby accurately controlling the wheel hub to rotate in place, ensuring the reliable operation of the turning system.

[0045] It should be understood that the controllers are connected in sequence, which means that the output of the previous controller is used as the input of the next controller. Specifically, a position sensor is provided at the motor G to detect the rotation position of the motor G, specifically the rotation angle θ of the rotor of the motor G; it can also detect the three-phase current i output by the motor G. U 、i V 、i W The position controller sets the target angle θ * The target speed ω is determined by the measured rotation angle θ fed back by the position sensor * , and input it into the speed controller. The speed controller is based on the target speed ω * The target torque is determined by the measured rotation angle θ and the measured speed ω = dθ / dt. The torque controller is based on the target torque. and the measured torque T e = pψ f i q (where p is the series, ψ f is the rotor flux, i q is the q-axis current), determine the target q-axis current And input it into the current controller e jθ . Current controller jθ According to the target d-axis current and the target q-axis current Determine the target three-phase current The operation of the converter cabinet 11 is controlled accordingly.

[0046] Optionally, the control system 20 is also used to control the motor G to rotate in the opposite direction so that the impeller stops rotating; and / or the turning system also includes a mechanical braking system, including a brake locking system of the motor G and a brake system of the impeller. By making the control system 20 stop the hub from rotating according to the reverse control of the turning drive, electrical braking can be achieved, and at the same time, the hub is accurately controlled to stay at the required position according to the measured rotation angle θ detected by the position sensor. In addition, by adopting a mechanical braking system, a mechanical braking with high reliability can be achieved, which helps to ensure that the hub of the impeller stops reliably. Since the braking system of the impeller is the braking system of the wind turbine generator set, it can make full use of existing equipment, which helps to reduce costs, and the brake locking system of the motor G can align the locking pin and the locking pin hole of the impeller by cooperating with the braking system of the impeller to achieve the braking purpose. As an example, in the case where the motor G includes a generator of the wind turbine generator set, the brake locking system in the mechanical braking system includes the hydraulic brake and locking system of the generator, which also helps to reduce costs. It should be understood that in order to achieve electric turning gear braking, at least one of the above-mentioned electrical braking method and mechanical braking method can be adopted. When the above-mentioned two braking methods are adopted at the same time to form a dual redundant braking method, electrical braking can be used to ensure braking accuracy, and mechanical braking can be used to ensure braking reliability, thereby fully ensuring the effective braking of the turning gear.

[0047] Another embodiment of the present disclosure provides a wind turbine generator set, including an impeller and a winch system provided by any of the above embodiments, and thus has all the beneficial technical effects of the winch system, which will not be described in detail here. The winch system is used to drive the impeller of the wind turbine generator set to rotate to a set position during the process of hoisting the wind turbine generator set, specifically to drive the hub of the impeller to rotate to a set position, and the set position is the target angle θ described in the above description of the control system 20 * .

[0048] The specific implementation methods of the present disclosure have been described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments may be modified and varied without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents. These modifications and variations should also be within the scope of protection of the claims of the present disclosure.

Claims

1. A drive system (10) for driving a motor of a turning system of a wind turbine generator set, characterized in that: The drive system (10) comprises: A converter cabinet (11), comprising a first converter (111) and a second converter (112), wherein the first converter (111) and the second converter (112) both comprise a machine-side converter and a grid-side converter connected via a DC bus, the machine-side converter being connected to a motor of the turning gear system, and the grid-side converter being directly or indirectly connected to a grid connection point of the wind turbine generator set; A grid-side circuit (12) connected between the grid-side converter of the first converter (111) and the grid connection point of the wind turbine generator set, so that the grid-side converter of the first converter (111) is indirectly connected to the grid connection point via the grid-side circuit (12); A cranking circuit (13) connects ends of the grid-side converter and the generator-side converter of the first converter (111) that are away from each other; A first bus circuit (14) connected between a positive DC bus of the first converter (111) and a positive DC bus of the second converter (112); and A second bus circuit (15) is connected between a negative DC bus of the first converter (111) and a negative DC bus of the second converter (112), The drive system (10) has a cranking mode and a grid-connected mode. In the cranking mode, the grid-side circuit (12) is disconnected, and the cranking circuit (13), the first bus circuit (14) and the second bus circuit (15) are turned on. In the grid-connected mode, the grid-side current is turned on, and the cranking circuit (13), the first bus circuit (14) and the second bus circuit (15) are disconnected.

2. The drive system (10) according to claim 1, characterized in that The drive system (10) further comprises: A machine-side auxiliary circuit (16) connects the machine-side converter of the first converter (111) with the machine-side converter of the second converter (112); the machine-side auxiliary circuit (16) is turned on in the cranking mode and turned off in the grid-connected mode.

3. The drive system (10) according to claim 1 or 2, characterized in that: The number of the converter cabinet (11) is at least one.

4. The drive system (10) according to claim 3, characterized in that When the number of the converter cabinets (11) is greater than or equal to two, the DC buses of the converter cabinets (11) are connected in parallel to each other in the cranking mode.

5. A turning system of a wind turbine generator set, characterized in that: The turning system comprises: An electric motor, used for driving the impeller of the wind turbine generator set to rotate during the process of hoisting the wind turbine generator set; and A drive system (10) as claimed in any one of claims 1 to 4.

6. The barring system according to claim 5, characterized in that: The electric motor comprises a generator of the wind turbine generator set.

7. The barring system according to claim 5, characterized in that: The turning system further comprises: A control system (20) is connected to the converter cabinet (11) of the drive system (10) and is used to control the rotation position of the motor.

8. The barring system according to claim 7, characterized in that: The control system (20) comprises a position controller, a speed controller, a torque controller and a current controller which are connected in sequence, and the current controller is connected to the converter cabinet (11).

9. The barring system according to claim 7 or 8, characterized in that: The control system (20) is also used to control the motor to rotate in the opposite direction so as to stop the impeller from rotating; and / or The turning system further comprises a mechanical braking system, including a brake locking system of the motor and a braking system of the impeller.

10. A wind turbine generator set, characterized in that: The wind turbine generator set comprises: impeller; and The winch system according to any one of claims 5 to 9 is used to drive the impeller of the wind turbine generator set to rotate to a set position during the process of hoisting the wind turbine generator set.

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