Control system in wind generating set and wind generating set

Abstract

The utility model provides a control system in a wind generating set and the wind generating set. The control system comprises a bidirectional electric energy conversion module, a yaw subsystem and a variable pitch subsystem, the other end of the bidirectional electric energy conversion module is connected with the direct-current bus; the direct-current bus is also connected with a first inversion module in the variable-pitch subsystem, and the first inversion module is connected with a variable-pitch motor; a second inverter module in the yaw subsystem is connected to the direct current bus and is connected with a yaw motor; the bidirectional electric energy conversion module is used for converting alternating-current electric energy provided by a power grid into direct-current electric energy and transmitting the direct-current electric energy to the yaw subsystem and the variable-pitch subsystem through a direct-current bus; or the bidirectional electric energy conversion module is also used for converting the direct-current electric energy in the direct-current bus into alternating-current electric energy and transmitting the alternating-current electric energy to the power grid. According to the mode, the number of circuit modules of the control system in the wind generating set is reduced, and the size and cost of the wind generating set are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power, in particular to a control system in a wind power generator set and a wind power generator set. Background Art

[0002] In a wind turbine generator set, the pitch system and the yaw system are relatively critical control systems. Among them, the pitch system includes three pitch motors, each pitch motor is equipped with a pitch driver, and the pitch driver includes a bidirectional power conversion module, an inverter module and a backup power supply module. The yaw system includes a yaw controller and a yaw motor, and the yaw controller includes a bidirectional power conversion module and an inverter module. In the above control system, the bidirectional power conversion module and the inverter module usually appear in pairs, that is, each inverter module needs to be equipped with a bidirectional power conversion module, resulting in a large number of circuit modules in the control system, a large volume and a high cost. Utility Model Content

[0003] In view of this, an object of the present invention is to provide a control system in a wind turbine generator set and a wind turbine generator set, so as to significantly reduce the number of circuit modules of the control system in the wind turbine generator set and reduce the size and cost of the wind turbine generator set.

[0004] In the first aspect, an embodiment of the utility model provides a control system in a wind turbine generator set, which control system includes a bidirectional power conversion module, a yaw subsystem and a pitch subsystem; one end of the bidirectional power conversion module is connected to the power grid, and the other end is connected to a DC bus; the DC bus is also connected to a first inverter module in the pitch subsystem, and the first inverter module is connected to a pitch motor; the second inverter module in the yaw subsystem is connected to the DC bus, and the second inverter module is connected to the yaw motor; the bidirectional power conversion module is used to convert the AC power provided by the power grid into DC power, and transmit it to the yaw subsystem and the pitch subsystem through the DC bus; or, the bidirectional power conversion module is also used to convert the DC power in the DC bus into AC power, and transmit it to the power grid.

[0005] The bidirectional power conversion module comprises a plurality of IGBT elements, which are connected in parallel; or, the bidirectional power conversion module comprises a plurality of IGCT elements, which are connected in parallel.

[0006] The above-mentioned yaw subsystem also includes a second DC / DC conversion module and a second energy storage unit; the second DC / DC conversion module is connected in parallel to the DC bus, and the second energy storage unit is connected to the second DC / DC conversion module.

[0007] The second energy storage unit includes at least one of a supercapacitor and a battery.

[0008] The control system further comprises a slip ring structure, which is arranged on a DC bus between the yaw subsystem and the pitch subsystem.

[0009] The above-mentioned variable pitch subsystem also includes a first DC / DC conversion module and a first energy storage unit; the first DC / DC conversion module is connected in parallel with the first inverter module; and the first energy storage unit is connected to the first DC / DC conversion module.

[0010] The above-mentioned variable pitch subsystem includes multiple above-mentioned first inverter modules; each first inverter module corresponds to a group of first DC / DC conversion modules and first energy storage units; each first inverter module is connected in parallel with a corresponding first DC / DC conversion module, and the first DC / DC conversion module is connected to the corresponding first energy storage unit.

[0011] The above-mentioned variable pitch subsystem includes a first anti-reverse connection module; one end of the first anti-reverse connection module is connected to the positive sub-line and the negative sub-line of the DC bus; the other end of the first anti-reverse connection module is connected to the first inverter module.

[0012] The above-mentioned variable pitch subsystem also includes a first DC / DC conversion module and a first energy storage unit; the first DC / DC conversion module is connected in parallel with the first inverter module; the first energy storage unit is connected to the first DC / DC conversion module; one end of the first anti-reverse connection module is connected to the positive sub-line and the negative sub-line of the DC bus; the other end of the first anti-reverse connection module is connected to the first DC / DC conversion module and the first inverter module.

[0013] In the second aspect, an embodiment of the utility model provides a wind turbine generator set, which includes the control system, blade structure and wind rotor structure in the above-mentioned wind turbine generator set; the blade structure is connected to the variable pitch motor of the variable pitch subsystem in the control system; the wind rotor structure is connected to the yaw motor of the yaw subsystem in the control system.

[0014] The embodiments of the present invention bring the following beneficial effects:

[0015] The control system and wind turbine generator set in the above-mentioned wind turbine generator set, wherein the control system includes a bidirectional power conversion module, a yaw subsystem and a pitch subsystem; one end of the bidirectional power conversion module is connected to the power grid, and the other end is connected to the DC bus; the DC bus is also connected to the first inverter module in the pitch subsystem, and the first inverter module is connected to the pitch motor; the second inverter module in the yaw subsystem is connected to the DC bus, and the second inverter module is connected to the yaw motor; the bidirectional power conversion module is used to convert the AC power provided by the power grid into DC power, and transmit it to the yaw subsystem and the pitch subsystem through the DC bus; or, the bidirectional power conversion module is also used to convert the DC power in the DC bus into AC power, and transmit it to the power grid.

[0016] The control system of the wind turbine generator set uses a centralized bidirectional power conversion module, one end of which is connected to the power grid and the other end is connected to the DC bus. It can convert the AC power provided by the power grid into DC power and directly transmit it to the yaw subsystem and the pitch subsystem through the DC bus, and it can also convert the DC power in the DC bus into AC power and transmit it to the power grid. In this way, there is no need to install a separate bidirectional power conversion module in the yaw subsystem and the pitch subsystem in the control system, which greatly reduces the number of circuit modules in the control system of the wind turbine generator set and reduces the size and cost of the wind turbine generator set.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a control system in a first wind turbine generator set provided by an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of a first yaw subsystem provided in an embodiment of the utility model;

[0022] Figure 3 A schematic structural diagram of a first variable pitch subsystem provided in an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the structure of a second variable pitch subsystem provided in an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of the structure of a second yaw subsystem provided in an embodiment of the utility model;

[0025] Figure 6 A schematic structural diagram of a control system in a second wind turbine generator set provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0027] In the prior art, the control system of a wind turbine generator set includes a pitch subsystem and a yaw subsystem. The pitch subsystem includes a plurality of pitch cabinets and corresponding pitch motors. Each pitch cabinet drives a pitch motor respectively. The pitch cabinet is composed of a pitch driver, a backup power supply, electrical components, etc. The pitch driver, as a single component with highly concentrated functions, usually includes a bidirectional power conversion module, a DC / DC direct current step-up and step-down conversion module, and an IGBT (Insulated Gate Bipolar Transistor) inverter module, etc. The yaw subsystem includes a yaw controller and a corresponding yaw motor. The yaw controller includes a rectifier unit and an inverter module. In the above-mentioned pitch subsystem and yaw subsystem, each inverter module needs to be configured with a bidirectional power conversion module, resulting in a large number of circuit modules in the entire control system, a large volume and a high cost.

[0028] Based on the above problems, this embodiment provides a control system in a wind turbine generator set and a wind turbine generator set, which can be applied in the field of wind power.

[0029] See also Figure 1 A structural schematic diagram of a control system in a wind turbine generator set is shown, the control system comprising a bidirectional power conversion module, a yaw subsystem and a pitch subsystem, wherein one end of the bidirectional power conversion module is connected to the power grid, and the other end is connected to the DC bus; the DC bus is also connected to the first inverter module in the pitch subsystem, and the first inverter module is connected to the pitch motor; the second inverter module in the yaw subsystem is connected to the DC bus, and the second inverter module is connected to the yaw motor; the bidirectional power conversion module is used to convert the AC power provided by the power grid into DC power, and transmit it to the yaw subsystem and the pitch subsystem through the DC bus; or, the bidirectional power conversion module is also used to convert the DC power in the DC bus into AC power, and transmit it to the power grid.

[0030] The control system includes a bidirectional power conversion module, a yaw subsystem and a pitch subsystem. The pitch subsystem includes a pitch motor and a first inverter module. The number of first inverter modules usually corresponds to the number of wind turbine blades. The yaw subsystem includes a yaw motor and a second inverter module. Generally, the number of yaw motors is not less than two, and each yaw motor is equipped with a second inverter module. Figure 1 In the control system shown, there are two second inverter modules in the yaw subsystem connected in parallel on the DC bus, and each second inverter module is connected to a yaw motor; there are three first inverter modules in the variable pitch subsystem connected in parallel on the DC bus, and each first inverter module is connected to a variable pitch motor.

[0031] The above-mentioned yaw subsystem and pitch subsystem are key control components in the wind turbine generator set. The second inverter module in the yaw subsystem is connected to the yaw motor. The second inverter module can be an IGBT inverter module, which is used to control the operation of the yaw motor to ensure the smooth operation of the yaw subsystem. The main function of the yaw subsystem is to control the yaw motor to adjust the position of the wind rotor so that the wind rotor is always in a windward state, so that the wind turbine generator set can absorb wind energy to the maximum extent and improve power generation efficiency, and provide locking torque when necessary to ensure that the wind turbine generator set can be safely positioned and operated after completing the wind-facing action.

[0032] The first inverter module in the above-mentioned variable pitch subsystem is connected to the variable pitch motor to control the smooth operation of the variable pitch motor. The main function of the variable pitch subsystem is to use the variable pitch driver to control the operation of the variable pitch motor, so as to achieve the purpose of changing the pitch angle of the wind turbine blades to control the speed of the wind rotor. In short, the variable pitch system controls the wind exposure of the blades by adjusting the pitch angle: under normal circumstances, the blades are controlled in a specific position to enable the wind turbine to generate electricity at a high speed below the rated power; in the event of a fault, the blades are controlled to be aligned to a safe position to ensure the safety of the wind turbine.

[0033] Here, the second inverter module in the yaw subsystem is connected to the DC bus, and the second inverter module is connected to the yaw motor. The DC bus is also connected to the first inverter module in the pitch subsystem, and the first inverter module is connected to the pitch motor. The above-mentioned bidirectional power conversion module includes multiple IGBT elements or IGCT (Intergrated Gate Commutated Thyristors) elements. One end of the bidirectional power conversion module is connected to the power grid and the other end is connected to the DC bus. It can be used to convert the AC power provided by the power grid into DC power, and transmit it to the yaw subsystem and the pitch subsystem through the DC bus. In addition, the bidirectional power conversion module can also convert the DC power in the DC bus into AC power and transmit it to the power grid.

[0034] In the related art, in the control system of the wind turbine generator set, the pitch subsystem generally includes a bidirectional power conversion module and an IGBT inverter module, and the yaw subsystem includes a bidirectional power conversion module and an inverter module. Each inverter module in the pitch subsystem and the yaw subsystem needs to be configured with a bidirectional power conversion module to convert AC power into DC power, and drive the pitch motor or yaw motor to operate through DC power. This method will result in a large number of circuit modules in the control system, a large volume and high cost.

[0035] In the control system provided by the utility model, the separate bidirectional power conversion module is cancelled inside the pitch subsystem and the yaw subsystem, and a centralized bidirectional power conversion module is used for rectification at the output end of the power grid. The current and power size of the bidirectional power conversion module can be designed according to the yaw and pitch comprehensive current and power size of the bidirectional power conversion module in parallel. The three-phase power output by the power grid can generate direct current through the bidirectional power conversion module, and the direct current is directly transmitted to the pitch subsystem and the yaw subsystem through the DC bus. When the motor is in the braking power generation mode, the bidirectional power conversion module can feed back to the power grid to reduce the power of the braking resistor; after the power grid is disconnected, the power grid can be reversely transmitted to provide power to the wind turbine main control, yaw and converter and other electrical components. In this way, since the separate bidirectional power conversion module is removed from the pitch subsystem and the yaw subsystem, the structure of the control system is more compact, the volume of the pitch drive and the yaw drive is reduced, and the cost is reduced.

[0036] The control system in the above-mentioned wind turbine generator set includes a bidirectional power conversion module, a yaw subsystem and a pitch subsystem; one end of the bidirectional power conversion module is connected to the power grid, and the other end is connected to the DC bus; the DC bus is also connected to the first inverter module in the pitch subsystem, and the first inverter module is connected to the pitch motor; the second inverter module in the yaw subsystem is connected to the DC bus, and the second inverter module is connected to the yaw motor; the bidirectional power conversion module is used to convert the AC power provided by the power grid into DC power, and transmit it to the yaw subsystem and the pitch subsystem through the DC bus; or, the bidirectional power conversion module is also used to convert the DC power in the DC bus into AC power, and transmit it to the power grid. In this way, there is no need to install a separate bidirectional power conversion module in the yaw subsystem and the pitch subsystem in the control system, which greatly reduces the number of circuit modules in the control system of the wind turbine generator set, and reduces the volume and cost of the wind turbine generator set.

[0037] In one embodiment, the bidirectional power conversion module includes a plurality of IGBT elements; the plurality of IGBT elements are connected in parallel; or, the bidirectional power conversion module includes a plurality of IGCT elements; the plurality of IGCT elements are connected in parallel.

[0038] That is to say, in one way, the bidirectional power conversion module may include multiple IGBT components, and the multiple IGBT components are connected in parallel. In another way, the bidirectional power conversion module may include multiple IGCT components, and the multiple IGCT components are connected in parallel. Through the IGBT components or IGCT components, the AC power provided by the power grid can be converted into DC power and transmitted to the yaw subsystem and the pitch subsystem through the DC bus, or the DC power in the DC bus can be converted into AC power and transmitted to the power grid.

[0039] In the control system of this mode, by using IGBT elements or IGBT elements as bidirectional power conversion modules for rectification at the input end, when the wind turbine generator set is in the power generation state, the electric energy can be transmitted to the power grid through the bidirectional power conversion module. At the same time, the electric energy generated by the wind turbine generator set charges the first energy storage unit and the second energy storage unit, and provides electric energy for pitch control and yaw. When the wind turbine generator set is not generating electricity, the electric energy stored in the first energy storage unit and the second energy storage unit can be used to power the pitch motor and the yaw motor, and can also be fed into the power grid through the bidirectional power conversion module.

[0040] In one embodiment, the yaw subsystem further includes a second DC / DC conversion module and a second energy storage unit; the second DC / DC conversion module is connected in parallel to the DC bus, and the second energy storage unit is connected to the second DC / DC conversion module.

[0041] The DC / DC module can be used to convert a fixed DC voltage into a variable DC voltage conversion module; the second energy storage unit can supply power to the yaw subsystem when the power grid is out of power or the power input to the yaw subsystem is abnormal.

[0042] Figure 2 A yaw subsystem is shown, and a second energy storage unit and a second DC / DC conversion module can also be configured in the yaw subsystem. The second DC / DC conversion module is connected in parallel to the DC bus, and the second energy storage unit is connected to the second DC / DC conversion module. When the wind turbine is off-grid or the DC bus circuit is abnormal and cannot smoothly transmit current to the yaw subsystem, the second energy storage unit can provide backup power for the yaw, so that the yaw subsystem and the pitch subsystem cooperate with the wind turbine main control command to perform anti-vortex excitation, anti-typhoon and other strategy control.

[0043] In one embodiment, the second energy storage unit includes at least one of a supercapacitor and a battery.

[0044] The above-mentioned second energy storage unit serves as an energy supplement for the yaw system to return to a safe position when the wind turbine is off-grid. It can be a module with energy storage function such as a supercapacitor or a battery. The second energy storage unit can also include both a supercapacitor and a battery. The working principle of the second energy storage unit is to input electric energy from the power grid. When the wind turbine is running, it is charged by controlling the second energy storage unit. Charging stops when the charging reaches the rated voltage. When it is off-grid and in an emergency, the second energy storage unit starts to discharge. According to the main control command, the yaw subsystem controls the cabin to return to a safe position.

[0045] In one embodiment, the control system further includes a slip ring structure; the slip ring structure is arranged on the DC bus between the yaw subsystem and the pitch subsystem. The slip ring structure is an electrical component responsible for connecting the rotating body and transmitting energy and signals. The control system includes a slip ring structure, and the bus from the three pitch motors is connected to the DC bus through the slip ring structure, which can avoid the problem of wire entanglement when the pitch motor and the impeller rotate together.

[0046] In one embodiment, the variable pitch subsystem may further include a first DC / DC conversion module and a first energy storage unit; the first DC / DC conversion module is connected in parallel with the first inverter module; and the first energy storage unit is connected to the first DC / DC conversion module.

[0047] The DC / DC module can be used to convert a fixed DC voltage into a variable DC voltage conversion module; the first energy storage unit can be used to supply power to the variable pitch subsystem when the power grid is out of power or the power input to the variable pitch subsystem is abnormal.

[0048] The variable pitch subsystem is also equipped with a first energy storage unit and a first DC / DC conversion module. The DC / DC conversion module is connected in parallel with the first inverter module; the first energy storage unit is connected to the first DC / DC conversion module. When an abnormality occurs in the DC bus circuit and the current cannot be smoothly transmitted to the variable pitch subsystem, the energy storage function of the first energy storage unit can be used to transmit electric energy to the variable pitch motor to maintain the control of the motor over the operation of the blades, avoid the failure of the blade operation control caused by sudden accidental damage to the power grid or circuit system, and effectively ensure that the circuit of the variable pitch subsystem can timely control the blade deceleration, stop and recycle in abnormal conditions to ensure the safety of the wind turbine.

[0049] In one embodiment, the variable pitch subsystem further includes a plurality of first inverter modules; each first inverter module corresponds to a group of first DC / DC conversion modules and a first energy storage unit; each first inverter module is connected in parallel with a corresponding first DC / DC conversion module, and the first DC / DC conversion module is connected to a corresponding first energy storage unit.

[0050] For example, Figure 3A variable pitch subsystem is shown, which includes three first inverter modules, each of which corresponds to a group of first DC / DC conversion modules and a first energy storage unit; each first inverter module is connected in parallel with a corresponding first DC / DC conversion module, and the first DC / DC conversion module is connected to the corresponding first energy storage unit. There are three variable pitch axes in the variable pitch subsystem, and each single axis has a separate energy storage unit. In the power generation state, the electric energy generated by the wind turbine is used to charge the first energy storage unit and provide electric energy for the variable pitch motor. When the wind turbine is not generating electricity, the electric energy stored in the first energy storage unit can be used to power the variable pitch motor, and can also be fed into the power grid through the bidirectional power conversion module.

[0051] In one embodiment, the variable pitch subsystem includes a first anti-reverse connection module; one end of the first anti-reverse connection module is connected to the positive sub-line and the negative sub-line of the DC bus; the other end of the first anti-reverse connection module is connected to the first inverter module.

[0052] In one implementation, the first anti-reverse connection module may include a resistor and a diode, for example, one or more diodes and a resistor are connected in series to obtain the first anti-reverse connection module; it can be understood that a resistor is a component that can hinder the passage of current, and a certain voltage drop will be generated when current passes through the resistor. A diode is a component with unidirectional conductivity, and current can only flow through the diode when the voltage direction is correct. When a resistor and a diode are connected in series, the conduction current of the diode can be controlled by adjusting the resistance value of the resistor, and the unidirectional conductivity of the diode can be used to achieve anti-reverse connection protection.

[0053] In another implementation, the first anti-reverse connection module may also include a fuse and a diode. This method also realizes anti-reverse connection protection through the unidirectional conductivity of the diode. When the power supply is connected normally, the diode does not work, and the current flows into the circuit through the fuse. When the power supply is reversed, the diode is instantly turned on, and the positive and negative poles of the power supply are approximately short-circuited. At this time, the short-circuit current generated by the short circuit will blow the fuse to achieve the reverse connection protection effect. In another implementation, the anti-reverse connection module includes a MOS tube. The MOS tube is a metal (metal)-oxide (oxide)-semiconductor (semiconductor) field effect transistor. The switching characteristics of the MOS tube can be used to control the conduction and disconnection of the circuit to design an anti-reverse connection protection circuit. Once the power supply polarity of the protected circuit is reversed, the MOS tube will form a short circuit to protect the entire circuit.

[0054] Here, taking the first anti-reverse connection module including a resistor and a diode as an example, the first anti-reverse connection module is composed of a resistor and a diode, and the first anti-reverse connection module is arranged between the positive sub-line of the DC bus and the first inverter module. At the same time, the first anti-reverse connection module is also arranged between the negative sub-line of the DC bus and the first inverter module.

[0055] In one embodiment, the variable pitch subsystem also includes a first DC / DC conversion module and a first energy storage unit; the first DC / DC conversion module is connected in parallel with the first inverter module; the first energy storage unit is connected to the first DC / DC conversion module; one end of the first anti-reverse connection module is connected to the positive sub-line and the negative sub-line of the DC bus; the other end of the first anti-reverse connection module is connected to the first DC / DC conversion module and the first inverter module.

[0056] For example, Figure 4 A pitch subsystem is shown, the pitch subsystem includes a first DC / DC conversion module, a first energy storage unit, a first anti-reverse connection module, a first inverter module and a pitch motor, wherein the first anti-reverse connection module can be formed by connecting a diode and a resistor in series, the first anti-reverse connection module is arranged between the positive sub-line of the DC bus and the first inverter module, and at the same time, the first anti-reverse connection module is also arranged between the positive sub-line of the DC bus and the first DC / DC conversion module in the pitch subsystem. The first anti-reverse connection module is arranged between the negative sub-line of the DC bus and the first inverter module, and at the same time, the first anti-reverse connection module is also arranged between the negative sub-line of the DC bus and the first DC / DC conversion module.

[0057] Correspondingly, an anti-reverse connection module can also be added to the yaw subsystem, such as Figure 5 As shown, the yaw subsystem includes a second DC / DC conversion module, a second energy storage unit, a second anti-reverse connection module, a second inverter module and a yaw motor, wherein the second anti-reverse connection module is connected between the DC bus and the second DC / DC conversion module, and can realize anti-reverse connection protection of the yaw subsystem circuit to ensure the safety of the yaw subsystem circuit. It should be noted that the composition structure of the second anti-reverse connection module can be the same as the composition structure of the second anti-reverse connection module.

[0058] In a specific implementation, the control system in the wind turbine generator set is as follows: Figure 6 As shown, the control system includes a bidirectional power conversion module, a yaw subsystem, a pitch subsystem and a slip ring structure. One end of the bidirectional power conversion module is connected to the power grid, and the other end is connected to a DC bus. The DC bus is also connected to three first inverter modules in the pitch subsystem, and each first inverter module is connected to a pitch motor; the second inverter module in the yaw subsystem is connected to the DC bus, and each second inverter module is connected to a yaw motor; the slip ring structure is arranged on the DC bus between the yaw subsystem and the pitch subsystem.

[0059] The variable pitch subsystem also includes three first inverter modules, each of which corresponds to a group of first DC / DC conversion modules and a first energy storage unit, each of which is connected in parallel with a corresponding first DC / DC conversion module, and the first DC / DC conversion module is connected to the corresponding first energy storage unit. The variable pitch subsystem also includes three first anti-reverse connection modules; the first anti-reverse connection module is arranged between the positive sub-line of the DC bus and the first inverter module, and at the same time, the first anti-reverse connection module is also connected in series between the positive sub-line of the DC bus and the first DC / DC conversion module in the variable pitch subsystem. The first anti-reverse connection module is arranged between the negative sub-line of the DC bus and the first inverter module, and at the same time, the first anti-reverse connection module is also connected in series between the negative sub-line of the DC bus and the first DC / DC conversion module.

[0060] The above-mentioned yaw subsystem further includes a second DC / DC conversion module and a second energy storage unit, the second DC / DC conversion module is connected in parallel to the DC bus, the second energy storage unit is connected to the second DC / DC conversion module, and the second reverse connection protection module is connected between the DC bus and the second DC / DC conversion module to realize circuit protection.

[0061] In the above-mentioned control systems, the three-phase electricity of the power grid can be rectified through the bidirectional power conversion module to generate direct current, which can be directly transmitted to the variable pitch subsystem and the yaw subsystem, and the direct current of the DC bus can be transmitted back to the power grid to achieve grid connection. The advantage of the grid-connected design is that when the input power is off or abnormal, the energy stored in the energy storage unit can not only meet the retracting action of the variable pitch system, but also can be reversed and transmitted to the power grid to supply power for the yaw, main control and converter. At the same time, the grid-connected design can directly transmit the electric energy of motor braking or reversal to the power grid, reducing the braking resistance and reducing the cost and volume of raw materials.

[0062] In the control system of the aforementioned wind turbine generator set, in the power generation state, the wind turbine generator set uses wind power as input, converts mechanical energy into electrical energy, and outputs the electrical energy to the power grid through a bidirectional power conversion module. At the same time, the electrical energy generated by the wind turbine generator set charges the first energy storage unit and the second energy storage unit, and provides electrical energy for the variable pitch motor and the yaw motor. When the wind turbine generator set is not generating electricity, the electrical energy stored in the first energy storage unit and the second energy storage unit can be used to power the variable pitch motor and the yaw motor, and can also be fed into the power grid through the bidirectional power conversion module.

[0063] Based on the control system in the above wind turbine generator set, a wind turbine generator set disclosed in an embodiment of the present invention is described in detail. The wind turbine generator set includes Figure 1 or Figure 6The control system, blade structure and rotor structure in the wind turbine generator set shown in the figure; wherein the blade structure is connected to the variable pitch motor of the variable pitch subsystem in the control system; the rotor structure is connected to the yaw motor of the yaw subsystem in the control system.

[0064] In the above-mentioned wind turbine generator set, the blade structure in the wind turbine generator set is the same as the above-mentioned Figure 1 or Figure 6 The variable pitch motor of the variable pitch subsystem in the control system shown is connected, and the wind wheel structure is connected to the yaw motor of the yaw subsystem in the control system.

[0065] In this way, there is no need to install a separate bidirectional power conversion module in the pitch subsystem and the yaw subsystem, which reduces the volume of the pitch drive and the yaw drive, makes the structure of the wind turbine generator set more compact, and reduces the manufacturing cost of the wind turbine generator set. The first energy storage unit and the second energy storage unit added to the wind turbine generator set can provide backup power to the pitch subsystem and the yaw subsystem when the wind turbine is off-grid, so that the pitch subsystem and the yaw subsystem can cooperate with the wind turbine master control command to perform anti-vortex excitation, anti-typhoon and other strategic control.

[0066] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the utility model can be embodied in the form of a software product in essence or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the utility model. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0068] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0069] Finally, it should be noted that the above embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A control system in a wind turbine generator set, characterized in that: The control system includes a bidirectional power conversion module, a yaw subsystem and a pitch subsystem; One end of the bidirectional power conversion module is connected to the power grid, and the other end is connected to the DC bus; the DC bus is also connected to the first inverter module in the pitch subsystem, and the first inverter module is connected to the pitch motor; The second inverter module in the yaw subsystem is connected to the DC bus, and the second inverter module is connected to the yaw motor; The bidirectional power conversion module is used to convert the AC power provided by the power grid into DC power, and transmit it to the yaw subsystem and the pitch subsystem through the DC bus; alternatively, the bidirectional power conversion module is also used to convert the DC power in the DC bus into AC power, and transmit it to the power grid.

2. The control system according to claim 1, characterized in that: The bidirectional power conversion module comprises a plurality of IGBT elements; the plurality of IGBT elements are connected in parallel; Alternatively, the bidirectional power conversion module includes a plurality of IGCT elements; the plurality of IGCT elements are connected in parallel.

3. The control system according to claim 1, characterized in that: The yaw subsystem also includes a second DC / DC conversion module and a second energy storage unit; The second DC / DC conversion module is connected in parallel to the DC bus, and the second energy storage unit is connected to the second DC / DC conversion module.

4. The control system according to claim 3, characterized in that: The second energy storage unit includes at least one of a supercapacitor and a battery.

5. The control system according to claim 1, characterized in that: The control system further comprises a slip ring structure, and the slip ring structure is arranged on a DC bus between the yaw subsystem and the pitch subsystem.

6. The control system according to claim 1, characterized in that: The pitch subsystem also includes a first DC / DC conversion module and a first energy storage unit; The first DC / DC conversion module is connected in parallel with the first inverter module; and the first energy storage unit is connected to the first DC / DC conversion module.

7. The control system according to claim 6, characterized in that: The variable pitch subsystem includes a plurality of the first inverter modules; each of the first inverter modules corresponds to a group of the first DC / DC conversion module and the first energy storage unit; Each of the first inverter modules is connected in parallel with a corresponding first DC / DC conversion module, and the first DC / DC conversion module is connected to a corresponding first energy storage unit.

8. The control system according to claim 1, characterized in that: The variable pitch subsystem includes a first anti-reverse connection module; one end of the first anti-reverse connection module is connected to the positive sub-line and the negative sub-line of the DC bus; the other end of the first anti-reverse connection module is connected to the first inverter module.

9. The control system according to claim 8, characterized in that: The pitch subsystem further includes a first DC / DC conversion module and a first energy storage unit; the first DC / DC conversion module is connected in parallel with the first inverter module; the first energy storage unit is connected to the first DC / DC conversion module; One end of the first anti-reverse connection module is connected to the positive sub-line and the negative sub-line of the DC bus; The other end of the first anti-reverse connection module is connected to the first DC / DC conversion module and the first inverter module.

10. A wind turbine generator set, characterized in that: The wind turbine generator set comprises the control system, blade structure and wind rotor structure in the wind turbine generator set according to any one of claims 1 to 9; The blade structure is connected to a pitch motor of a pitch subsystem in the control system; The wind wheel structure is connected to the yaw motor of the yaw subsystem in the control system.

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