CN110620516A - Parallel wind power converter system and control method thereof - Google Patents
Parallel wind power converter system and control method thereof Download PDFInfo
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- CN110620516A CN110620516A CN201911024327.1A CN201911024327A CN110620516A CN 110620516 A CN110620516 A CN 110620516A CN 201911024327 A CN201911024327 A CN 201911024327A CN 110620516 A CN110620516 A CN 110620516A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1422—Printed circuit boards receptacles, e.g. stacked structures, electronic circuit modules or box like frames
- H05K7/1427—Housings
- H05K7/1432—Housings specially adapted for power drive units or power converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a parallel wind power converter system, which comprises N wind power converters connected in parallel; the wind power converter comprises machine side assemblies, power unit assemblies and grid side assemblies which are longitudinally staggered; the wind power converter cabinet body is internally divided into a first space, a second space and a third space which are arranged from top to bottom, and the machine side assembly is arranged in the first space or the third space in the wind power converter cabinet body; according to the wind power converter, the reasonable layout is carried out on all modules of the wind power converter, power flow reaches the power unit assembly from top to bottom by the machine side assembly and then reaches the grid side assembly from top to bottom by the power unit assembly, the electrical connection distance and the electrical connection overlapping point are reduced, and the single machine layout and the online redundant parallel operation strategy of the parallel wind power converter system formed by the whole wind power converter are reduced.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a parallel wind power converter system and a control method thereof.
Background
With the aggravation of the crisis of fossil energy, the development and utilization of new energy have become a hot point of research at present, especially in the technical field of wind power generation, and a wind power converter is a key component of wind power generation. The direct-drive wind power converter has the characteristics of no gear box, high reliability, low maintenance cost and the like, so that the direct-drive wind power converter is widely applied to offshore wind power with high reliability requirements. The offshore wind power engineering cost is high, and in order to reduce the cost of unit power, a large-capacity offshore wind power converter becomes a development trend, while a parallel wind power converter with multiple parallel machines is a common capacity expansion mode.
The parallel wind power converter system comprises N parallel wind power converters, the parallel architecture of the parallel wind power converters is shown in figure 1, the N converters respectively comprise a grid-side converter and a machine-side converter which are connected in series, one end of the machine-side converter is connected with a fan, the grid-side converter is connected with a power grid, and the grid-side converter is connected with the machine-side converter through a bus capacitor. Wherein a single converter is divided into three parts according to a main loop: the machine side interface is connected to the power unit part and can be called a machine side component; the power module and the accessory structural parts thereof can be called as a power unit assembly; and thirdly, the rear end of the power unit is connected with a network side interface, which can be called a network side component.
Electrical connections need to be used among the machine side components, the power cell components, and the grid side components, and the layout of different components determines the length of the electrical connection distance, and the conventional layout structure is shown in fig. 2. In the single machine layout, a cable is led in from the lower part of the machine side switch, goes up to the machine side power unit through the machine side inductor, connects the machine side power unit and the network side power unit into a whole through the shared busbar and then goes down to the network side inductor from the network side power unit. After the current is converged, the current traverses the whole inductance cabinet to be connected with a network side switch and then to a power grid. Because switch, inductance, power unit all are three-dimensional, and in addition the needs of maintaining, connect the rear end that the copper bar can only be followed the front end of inductance and wound the switch, need more bending, turn to, overlap joint at the process of turn and connection, the quantity of copper bar is great, in addition preceding converge with reciprocal the connection, whole unit copper bar quantity is bigger. The power flow turns back and forth from bottom to top, then from right to left, and the power flow detours more.
When the whole machine operates in parallel, all the wind power converters connected in parallel can work simultaneously or partially, so that redundant operation can be realized and the efficiency can be improved. Taking the example of FIG. 1, when m (m is more than or equal to 1) wind power converters have faults, the wind power converters can be switched out by disconnecting the grid side switch and the machine side switch, and other wind power converters run normally; when the power requirement is small, m wind power converters can be actively switched out to improve the efficiency; when the power demand of the motor is large, other m wind power converters can be actively put into use. However, in the existing scheme, the wind power converter is switched off or put into operation in a shutdown state, and for some occasions with real-time change of operation conditions, shutdown switching obviously interrupts operation and affects efficiency; and for some occasions with high-voltage and low-voltage ride-through reactive power support requirements, complete cutting of a certain machine can cause the whole system not to meet the reactive power support requirements of high-voltage and low-voltage ride-through.
Comprehensively, the existing parallel wind power converter system has the defects of unsmooth internal power flow, higher cost, larger line loss and inflexible redundant control on the stand-alone layout, and cannot meet the requirements of the efficiency and the reliability of a wind field power grid.
Disclosure of Invention
The following presents a simplified summary of embodiments of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that the following summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
According to an aspect of the present application, there is provided a parallel type wind power converter system including a plurality of wind power converters connected in parallel; the wind power converter comprises a wind power converter cabinet body, and a machine side assembly, a power unit assembly and a grid side assembly which are arranged in the wind power converter cabinet body in a longitudinally staggered manner; the wind power converter cabinet body is internally divided into a first space, a second space and a third space which are arranged from top to bottom, and the machine side assembly is arranged in the first space or the third space in the wind power converter cabinet body; the grid side assembly is arranged in a first space or a third space in the wind power converter cabinet body, the power unit assembly is arranged in a second space in the wind power converter cabinet body, and an input port of the power unit assembly is electrically connected with an output port of the machine side assembly through a conductor; the input port of the net side assembly is electrically connected with the output port of the power unit assembly through a conductor. According to the wind power converter system, all modules of the wind power converter are reasonably arranged, the power flow reaches the power unit assembly from top to bottom through the machine side assembly and then reaches the grid side assembly from top to bottom through the power unit assembly, the distance of electrical connection and the lap joint point of the electrical connection are reduced, and the single machine arrangement and the online redundant parallel operation strategy of the whole parallel wind power converter system are reduced. In addition, the machine side components, the power unit components and the net side components are not limited to the above-mentioned top-to-bottom layout structure, and can be arranged in a vertically staggered manner in addition to the top-to-bottom hierarchical layout. The layout scheme is more perfect and the use is more convenient.
The network side assembly comprises a network side inductor and a network side switch; the network side inductor is arranged below the power unit, the network side switch is arranged on one side of the network side inductor, and the network side inductor is electrically connected with the power unit assembly through a conductor.
Further, the power unit assembly comprises at least one integrated single-phase module, and the single-phase module comprises a machine side module, a network side module and a bus capacitor which are integrated together, wherein the machine side module and the network side module are respectively arranged on two sides of the bus capacitor.
Furthermore, the power unit assembly further comprises a driving single plate, a module busbar and an alternating current outlet port, a busbar capacitor is mounted on the module busbar, the alternating current outlet port of the module is close to the outlet wire, the input port of the power unit assembly is arranged at the top of the power unit assembly, the output port of the machine side assembly is arranged at the lower part of the power unit assembly, the input port of the net side assembly is arranged at the upper part of the power unit assembly, and the output port of the power unit assembly is arranged at the bottom.
Further, the machine side component is a circuit connector, or a combination of the circuit connector and a machine side switch, or a combination of the circuit connector and a machine side inductor.
According to another aspect of the present application, a control method for a parallel wind power converter system is provided, where the parallel wind power converter system includes N wind power converters with parallel redundant operation, and the following control method is performed: setting an X1 typhoon power converter to be in an online mode, setting an X2 typhoon power converter to be in a semi-offline mode, and setting X1+ X2 to be less than or equal to N; the online mode is that the grid-side converter and the machine-side converter of the wind power converter both run online, the semi-offline mode is that the grid-side converter of the wind power converter runs online, and the machine-side converter is stopped to be in an offline running state;
calculating the number of wind power converters needing to be put into operation according to the real-time power generation power or power generation current demand, judging whether the number is consistent with the number of the wind power converters in the current online mode, and if not, determining the number Y of the wind power converters in the semi-offline mode needing to be added or the number Z of the wind power converters in the online mode needing to be switched out;
adding Y wind power converters in a semi-offline mode or cutting Z wind power converters in online operation; starting a machine side converter of a Y-set wind power converter in a semi-offline mode, and putting the machine side converter into a parallel wind power converter system, wherein the Y-set wind power converter in the semi-offline mode is switched into an online mode, so that the newly added investment of the Y-set wind power converter in the semi-offline mode is realized; or controlling a machine side converter of the Z online mode wind power converter needing to be switched off to stop, and keeping a grid side converter of the Z online mode wind power converter to run online, wherein the Z online mode wind power converter is switched into a semi-offline mode, so that the switching-off of the Z online mode wind power converter is realized.
In the control process, when the number of the wind power converters needing to be put into operation is calculated, the number of the wind power converters needing to be put into operation is calculated according to the input logic and the cut-out logic, wherein the formula for calculating the number of the wind power converters needing to be put into operation according to the input logic is as follows:
N1[ (current real-time generated power + Δ P) ]1) Rated power of single machine]Get integer +1
The formula for calculating the number of the wind power converters needing to be put into operation according to the cut-out logic is as follows:
N2[ (current real-time generated power + Δ P) ]2) Rated power of single machine]Get integer +1
In the formula: delta P1、ΔP2Are all fixed offsets, and Δ P2＞ΔP1The rated power of a single wind power converter is more than 0; the result of the calculation according to the throw-in logic is only used as a reference for increasing the throw-in, and the result of the calculation according to the cutting-out logic is only used as a reference for cutting-out.
The method specifically comprises the following steps of: starting the machine side converter of the wind power converter in the Y-station semi-offline mode to ensure that the given torque of the machine side converter of each Y station is gradually increased; the torque rating of the machine side converter of the X1 wind power converter, which is originally in online mode, is gradually decreased until the torque rating of the machine side converter of each of the X1+ Y wind power converters is equal to 1/(X1+ Y) of the total torque rating; during commissioning, the sum of the torque specifications of the machine-side converters of the X1+ Y wind power converters is always equal to the total torque specification.
In the process of putting into operation, the torque given by the machine side converter of each of the X1 wind power converters is always equal in the process of reducing, and is equal to (total torque given-torque given by the machine side converter of the added Y wind power converters)/X1; the torque setpoint of the machine-side converter of each of the Y wind power converters is also always kept equal during the increase.
Specifically, the step of switching out the Z-station online mode wind power converter specifically includes: during the switching-out process of Z wind power converters originally in the online mode, the torque given by the machine side converter of each wind power converter is gradually reduced by 1/X1 given by the total torque, while the torque given by the machine side converters of the remaining X1-Z wind power converters still in the online mode is gradually increased until the sum of the torque given by the machine side converters of the X1-Z wind power converters in the online mode is equal to the total torque given, and the torque given by the machine side converter of each wind power converter is equal to 1/(X1-Z) of the total torque given; during the switching-out process, the sum of the torque setpoint of the machine-side converter of the switched-out wind power converter of this Z station and the torque setpoint of the machine-side converter of the remaining X1-Z wind power converter still in online mode is always equal to the total torque setpoint.
During the switching-out process, the torque given by the machine side converter of each wind power converter of the X1-Z machines still in the online mode is always equal in the increasing process and is equal to (total torque given-torque given by the machine side converter of the switched-out wind power converter of the Z machines)/(X1-Z); the torque setpoint of the machine-side converter of each of the Z switched-out wind power converters is always equal during the reduction process.
As a further technical solution, the control method further includes a fault redundancy control process, specifically including: when the parallel wind power converter system fails, all the wind power converters are shut down; then setting the wind power converter with the fault as a start-forbidden state; and finally restarting the non-fault wind power converter. The scheme can realize multi-machine redundancy control, all power modules can not stop working due to the fault of the main control module or the communication fault between the main control module and the main control module, and the effect of the whole converter unit can be improved.
As a further technical solution, the control method further includes: and under the condition of sudden increase of the wind speed, limiting the power rising speed of the parallel wind power converter system by a variable pitch or yaw measure.
The invention has the beneficial effects that: the converter internal power flows smoothly, the input end is adjacent to the connection port of the output end, and the converter can be directly connected, the internal connection has no reciprocating motion, large-range bending and long-distance converging connection, the turning or bending lap joint between the electrical points is less, the use and electrical lap joint points of a main loop conductor are reduced, the complete machine power flow is smooth, the complete machine cost is reduced, the loss in a loop is reduced, and the complete machine cost performance is improved. On the aspect of operation control, the switching operation can be carried out without stopping the machine, so that not only is the online rapid switching realized and the operation efficiency is optimized, but also the requirements of different occasions can be met, including the occasions that the operation working conditions are changed in real time and cannot be interrupted; in addition, under the control method, even if a part of machine side converters of the wind power converter stop running, the grid side converters of the wind power converter keep running on line, so that when high and low voltage ride through occurs, the semi-offline wind power converter still has a reactive power support function, and the control method can also meet the applicability requirements of high and low voltage ride through and other power grids.
Drawings
The invention may be better understood by referring to the following description in conjunction with the accompanying drawings, in which like reference numerals are used throughout the figures to indicate like or similar parts. The accompanying drawings, which are incorporated in and form a part of this specification, illustrate preferred embodiments of the present invention and, together with the detailed description, serve to further explain the principles and advantages of the invention. In the drawings:
FIG. 1 is a block diagram of a parallel operation architecture of a parallel wind power converter, including N stand-alone wind power converters;
FIG. 2 is a block diagram of a conventional stand-alone internal layout architecture;
FIG. 3a is a schematic diagram of the stand-alone internal main loop connection and its power flow of the present application, FIG. 3B is a view from direction A of FIG. 3a, and FIG. 3c is a view from direction B of FIG. 3 a;
FIG. 4 is a block diagram of a redundancy control strategy of the present application.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the figures and description omit representation and description of components and processes that are not relevant to the present invention and that are known to those of ordinary skill in the art for the sake of clarity.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a wind power converter system based on a new single machine layout and redundancy control aiming at various defects of the existing parallel type converter system, and referring to fig. 3a, fig. 3B and fig. 3c, as a specific embodiment, fig. 3a is a single machine layout and a power flow schematic diagram of the wind power converter system, fig. 3B is an a-direction view in fig. 3a, and fig. 3c is a B-direction view in fig. 3 a.
Converter major loop subassembly mainly includes machine side switch 1, machine side inductance 2, power unit component 3, net side inductance 4, net side switch 5, machine side port 6, net side port 7 and other auxiliary devices 12, first conductor 8, second conductor 9, third conductor 10, fourth conductor 11, machine side switch 1 is connected with machine side inductance 2 through first conductor 8, machine side inductance 2 is connected with the machine side module in power unit component 3 through second conductor 9, the net side module in power unit component 3 is connected with net side inductance 4 through third conductor 10, net side inductance 4 is connected with net side switch 5 through fourth conductor 11. A machine side port 6 of the whole machine is connected with one end of a machine side switch 1, the machine side switch 1 is placed beside a machine side inductor 2, and the other end of the machine side switch 1 is close to one port of the machine side inductor 2 and is connected through a first conductor 8.
The power unit assembly 3 is centered below the machine side inductor 2. In the power unit assembly 3, the machine side module is on top and the grid side module is on the bottom. Because the machine side inductor 2 and the machine side switch 1 have certain depth dimension, the other port of the machine side inductor 2 and the alternating current port of the machine side module are basically on the same vertical line, and the ports are close to each other and connected through the second conductor 9.
The grid side inductor 4 is disposed below the power unit assembly 3, and a grid side module ac port of the power unit assembly 3 is adjacent to one port of the inductor, and may also be connected by a third conductor 10. The grid-side switch 5 is placed beside the grid-side inductor 4, and then the other port of the grid-side inductor 4 is adjacent to one port of the grid-side switch 5 and connected through a fourth conductor 11, and the other port of the grid-side switch 5 is connected with the grid, and then connected with the grid.
In the application, the wind power converter comprises a wind power converter cabinet body, and a machine side assembly, a power unit assembly 3 and a grid side assembly which are arranged in the wind power converter cabinet body in a longitudinally staggered manner; the internal three installation spaces that divide into up, well down and arrange of wind power converter cabinet: the wind power converter cabinet comprises a first space, a second space and a third space, wherein a machine side assembly is arranged in the first space or the third space in the wind power converter cabinet body; the grid side assembly is arranged in a first space or a third space in the wind power converter cabinet body, and the power unit assembly is arranged in a second space in the wind power converter cabinet body.
In the electrical connection, the input port of the power unit component is close to the output port of the machine side component, and the electrical connection is realized through a conductor; the input port of the net side assembly is close to the output port of the power unit assembly, and the net side assembly is electrically connected with the output port of the power unit assembly through a conductor. The machine side assembly, the power unit assembly and the net side assembly are distributed in an up-middle-down mode in the vertical direction, but are not limited to be on the same vertical line, and the placing positions of the devices in the upper, middle and lower regions can be adjusted according to actual requirements. The power unit assembly is placed in the middle, the machine side assembly is located above the power unit, the network side inductor and the network side switch are located below the power unit, the whole machine adopts a layout mode from top to bottom, electric direct connection can be achieved, the connection length is reduced, the whole connection is smooth, and the using amount of an electric conductor, bending and an electric overlap joint are reduced.
The power unit assembly of the single machine comprises at least one integrated single-phase module, and the single-phase module comprises a machine side module, a network side module and a bus capacitor which are integrated together, wherein the machine side module and the network side module are respectively arranged on two sides of the bus capacitor. The machine side module, the bus capacitor and the network side module are longitudinally distributed, the machine side module and the network side module are respectively arranged at the upper side and the lower side of the bus capacitor, and the machine side module, the bus capacitor and the network side module can also be of a left-middle-right structure. The power unit assembly further comprises a driving single plate, a module busbar and an alternating current outlet port, a busbar capacitor is mounted on the module busbar, and the module alternating current port is close to the outlet. When a plurality of single-phase modules are integrated, the power unit assembly further comprises a common busbar, and a side outlet wire of the module busbar is connected with the common busbar. The wire side module is disposed adjacent the wire side assembly. The machine side switch is electrically connected with the machine side inductor, and the machine side inductor is connected with the machine side module in the power unit assembly.
On the basis of the single machine layout, the system parallel redundant operation comprises the following steps:
the method comprises the following steps that firstly, an X1 typhoon power converter is set to be in an online mode, an X2 typhoon power converter is set to be in a semi-offline mode, and X1+ X2 is ≦ N; the online mode is that the grid-side converter and the machine-side converter of the wind power converter both operate online, the semi-offline mode is that the grid-side converter of the wind power converter operates online, and the machine-side converter is stopped to be in an offline operation state, as shown in fig. 4; secondly, calculating the number of the wind power converters needing to be put into operation according to the real-time power generation power or power generation current demand, judging whether the number is consistent with the number of the wind power converters in the current online mode, and if not, determining the number Y of the wind power converters in the semi-offline mode needing to be added or the number Z of the wind power converters in the online mode needing to be switched out; and thirdly, adding a wind power converter which is put into a Y semi-offline mode, or cutting out Z wind power converters which run online. The increasing input refers to starting a machine side converter of the wind power converter in the semi-offline mode, and inputting the machine side converter into a parallel wind power converter system, so that the wind power converter in the semi-offline mode is switched into an online mode, and the newly increasing input of the Y wind power converters in the semi-offline mode is realized; switching out refers to the shutdown of the machine side converter of the wind power converter in the online mode, and the online operation of the grid side converter of the wind power converter is kept, so that the wind power converter in the online mode is switched into the semi-offline mode, and the switching out of the Z online mode wind power converters is realized.
Specifically, when the number of the wind power converters needing to be put into operation is calculated, the number of the wind power converters needing to be put into operation is calculated according to the input logic and the cut-out logic, wherein the formula for calculating the number of the wind power converters needing to be put into operation according to the input logic is as follows:
N1[ (current real-time generated power + Δ P) ]1) Rated power of single machine]Get integer +1
The formula for calculating the number of the wind power converters needing to be put into operation according to the cut-out logic is as follows:
N2[ (current real-time generated power + Δ P) ]2) Rated power of single machine]Get integer +1
In the formula: delta P1、ΔP2Are all fixed offsets, and Δ P2＞ΔP1And the rated power of a single machine is more than 0. The result of the calculation according to the throw-in logic is only used as a reference for increasing the throw-in, and the result of the calculation according to the cut-out logic is only used as a reference for cutting-out.
The step of realizing the newly added investment of the Y-station semi-offline mode wind power converter specifically comprises the following steps: starting the machine side converter of the wind power converter in the Y-station semi-offline mode to ensure that the given torque of the machine side converter of each Y station is gradually increased; the torque rating of the machine side converter of the X1 wind power converter, which is originally in online mode, is gradually decreased until the torque rating of the machine side converter of each of the X1+ Y wind power converters is equal to 1/(X1+ Y) of the total torque rating; during commissioning, the sum of the torque contributions of the machine side converters of the X1+ Y wind power converters is always equal to the total torque contribution, while the torque contributions of the machine side converter of each of the X1 wind power converters already running online are always kept equal during the reduction, equal to (total torque contribution-torque contribution of the machine side converter of the wind power converter to which Y is added)/X1; the torque settings of the machine-side converter of each of the newly added Y wind power converters are always equal during the increase.
The step of switching out the Z-station online mode wind power converter specifically comprises the following steps: during the switching-out process of the Z wind power converters originally in the online mode, the torque given by the machine side converter of each wind power converter is gradually reduced by 1/X1 given by the total torque, while the torque given by the machine side converters of the remaining X1-Z wind power converters still in the online mode is gradually increased until the sum of the torque given by the machine side converters of the X1-Z wind power converters in the online mode is equal to the total torque given, and the torque given by the machine side converter of each wind power converter is equal to 1/(X1-Z) of the total torque given. During the switching-out process, the sum of the torque setpoint of the machine-side converter of the switched-out wind power converter of this Z station and the torque setpoint of the machine-side converter of the remaining X1-Z wind power converter still in online mode is always equal to the total torque setpoint. During the switching-out process, the torque giving of the machine side converter of each of the X1-Z wind power converters still in the online mode is always kept equal during the increase, equal to (total torque giving-torque giving of the machine side converter of the switched-out wind power converter of Z)/(X1-Z); the torque setpoint of the machine-side converter of each of the Z switched-out wind power converters is always equal during the reduction process.
The parallel redundancy operation mode further comprises fault redundancy control, and the method specifically comprises the following steps: firstly, when the parallel wind power converter system fails, all the wind power converters are shut down; secondly, setting the wind power converter with the fault as a start-forbidden state; and thirdly, restarting the non-fault wind power converter.
The converter has smooth internal power flow on the layout, the input end is adjacent to the connecting port of the output end and can be directly connected, the internal connection does not reciprocate, the bending in a large range and the long-distance confluence connection are realized, the turning or bending lap joint among electrical points is less, the use of a main loop conductor and an electrical lap joint are reduced, the power flow of the whole machine is smooth, the cost of the whole machine is reduced, the loss in a loop is reduced, and the cost performance of the whole machine is improved. In the aspect of operation control, the switching operation can be carried out without stopping the machine, so that not only is the online rapid switching realized and the operation efficiency is optimized, but also the requirements of different occasions can be met, including the occasions that the operation working conditions are changed in real time and cannot be interrupted; in addition, under the control method, even if a part of machine side converters of the wind power converter stop running, the grid side converters of the wind power converter keep running on line, so that when high and low voltage ride through occurs, the semi-offline wind power converter still has a reactive power support function, and the control method can also meet the applicability requirements of high and low voltage ride through and other power grids.
In the foregoing description of specific embodiments of the invention, features described and/or illustrated with respect to one embodiment may be used in the same or similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
While the present invention has been disclosed above by the description of specific embodiments thereof, it should be understood that all of the embodiments and examples described above are illustrative and not restrictive. Various modifications, improvements and equivalents of the invention may be devised by those skilled in the art within the spirit and scope of the appended claims. Such modifications, improvements and equivalents are also intended to be included within the scope of the present invention.
Claims (13)
1. The utility model provides a parallelly connected type wind-powered electricity generation converter system which characterized in that: the system comprises a plurality of wind power converters connected in parallel; the wind power converter comprises a wind power converter cabinet body, and a machine side assembly, a power unit assembly and a grid side assembly which are arranged in the wind power converter cabinet body in a longitudinally staggered manner; the wind power converter cabinet body is internally divided into a first space, a second space and a third space which are arranged from top to bottom, and the machine side assembly is arranged in the first space or the third space in the wind power converter cabinet body; the grid side assembly is arranged in a first space or a third space in the wind power converter cabinet body, the power unit assembly is arranged in a second space in the wind power converter cabinet body, and an input port of the power unit assembly is electrically connected with an output port of the machine side assembly through a conductor; the input port of the net side assembly is electrically connected with the output port of the power unit assembly through a conductor.
2. The parallel wind power converter system of claim 1, wherein: the network side assembly comprises a network side inductor and a network side switch; the network side inductor is arranged below the power unit, the network side switch is arranged on one side of the network side inductor, and the network side inductor is electrically connected with the power unit assembly through a conductor.
3. The parallel wind power converter system of claim 1, wherein: the power unit assembly comprises at least one integrated single-phase module, wherein the single-phase module comprises a machine side module, a network side module and a bus capacitor which are integrated together, and the machine side module and the network side module are respectively arranged on two sides of the bus capacitor.
4. The parallel wind power converter system of claim 3, wherein: the power unit assembly further comprises a driving single plate, a module busbar and an alternating current outlet port, a busbar capacitor is mounted on the module busbar, the module alternating current outlet port is close to the outlet wire, an input port of the power unit assembly is arranged at the top of the power unit assembly, an output port of the machine side assembly is arranged at the lower part of the power unit assembly, an input port of the net side assembly is arranged at the upper part of the power unit assembly, and an output port of the power unit assembly is arranged at the bottom.
5. The parallel wind power converter system according to any of claims 1-4, wherein: the machine side component is a circuit connector, or a combination of the circuit connector and a machine side switch, or a combination of the circuit connector and a machine side inductor.
6. A control method of a parallel wind power converter system is characterized in that: the parallel wind power converter system comprises N wind power converters which are in parallel redundant operation, and executes the following control method:
setting an X1 typhoon power converter to be in an online mode, setting an X2 typhoon power converter to be in a semi-offline mode, and setting X1+ X2 to be less than or equal to N; the online mode is that the grid-side converter and the machine-side converter of the wind power converter both run online, the semi-offline mode is that the grid-side converter of the wind power converter runs online, and the machine-side converter is stopped to be in an offline running state;
calculating the number of wind power converters needing to be put into operation according to the real-time power generation power or power generation current demand, judging whether the number is consistent with the number of the wind power converters in the current online mode, and if not, determining the number Y of the wind power converters in the semi-offline mode needing to be added or the number Z of the wind power converters in the online mode needing to be switched out;
adding Y wind power converters in a semi-offline mode or cutting Z wind power converters in online operation; starting a machine side converter of a Y-set wind power converter in a semi-offline mode, and putting the machine side converter into a parallel wind power converter system, wherein the Y-set wind power converter in the semi-offline mode is switched into an online mode, so that the newly added investment of the Y-set wind power converter in the semi-offline mode is realized; or controlling a machine side converter of the Z online mode wind power converter needing to be switched off to stop, and keeping a grid side converter of the Z online mode wind power converter to run online, wherein the Z online mode wind power converter is switched into a semi-offline mode, so that the switching-off of the Z online mode wind power converter is realized.
7. The control method of the parallel wind power converter system according to claim 6, characterized in that: when the number of the wind power converters needing to be put into operation is calculated, the number of the wind power converters needing to be put into operation is calculated according to the input logic and the cut-out logic, wherein the formula for calculating the number of the wind power converters needing to be put into operation according to the input logic is as follows:
N1[ (current real-time generated power + Δ P) ]1) Rated power of single machine]Rounding + 1;
the formula for calculating the number of the wind power converters needing to be put into operation according to the cut-out logic is as follows:
N2[ (current real-time generated power + Δ P) ]2) Rated power of single machine]Rounding + 1;
in the formula: delta P1、ΔP2Are all fixed offsets, and Δ P2＞ΔP1The rated power of a single wind power converter is more than 0; the result of the calculation according to the throw-in logic is only used as a reference for increasing the throw-in, and the result of the calculation according to the cutting-out logic is only used as a reference for cutting-out.
8. The control method of the parallel wind power converter system according to claim 6, characterized in that: the step of realizing the newly added investment of the Y-station semi-offline mode wind power converter specifically comprises the following steps: starting the machine side converter of the wind power converter in the Y-station semi-offline mode to ensure that the given torque of the machine side converter of each Y station is gradually increased; the torque rating of the machine side converter of the X1 wind power converter, which is originally in online mode, is gradually decreased until the torque rating of the machine side converter of each of the X1+ Y wind power converters is equal to 1/(X1+ Y) of the total torque rating; during commissioning, the sum of the torque specifications of the machine-side converters of the X1+ Y wind power converters is always equal to the total torque specification.
9. The control method of the parallel wind power converter system according to claim 8, wherein: during the operation, the torque given by the machine side converter of each of the X1 wind power converters is always equal in the process of reduction and is equal to (total torque given-torque given by the machine side converter of the added wind power converter of Y wind power converters)/X1; the torque setpoint of the machine-side converter of each of the Y wind power converters is also always kept equal during the increase.
10. The control method of the parallel wind power converter system according to any of claims 6 to 9, characterized in that: the step of switching out the Z-station online mode wind power converter specifically comprises the following steps: during the switching-out process of Z wind power converters originally in the online mode, the torque given by the machine side converter of each wind power converter is gradually reduced by 1/X1 given by the total torque, while the torque given by the machine side converters of the remaining X1-Z wind power converters still in the online mode is gradually increased until the sum of the torque given by the machine side converters of the X1-Z wind power converters in the online mode is equal to the total torque given, and the torque given by the machine side converter of each wind power converter is equal to 1/(X1-Z) of the total torque given; during the switching-out process, the sum of the torque setpoint of the machine-side converter of the switched-out wind power converter of this Z station and the torque setpoint of the machine-side converter of the remaining X1-Z wind power converter still in online mode is always equal to the total torque setpoint.
11. The control method of the parallel wind power converter system according to claim 10, wherein: during the switching-out process, the torque given by the machine side converter of each wind power converter of the X1-Z machines still in the online mode is always equal in the increasing process and is equal to (total torque given-torque given by the machine side converter of the switched-out wind power converter of the Z machines)/(X1-Z); the torque setpoint of the machine-side converter of each of the Z switched-out wind power converters is always equal during the reduction process.
12. The control method of the parallel wind power converter system according to any of claims 6 to 9, characterized in that: the control method further comprises a fault redundancy control process, which specifically comprises the following steps: firstly, when the parallel wind power converter system fails, all the wind power converters are shut down, then the failed wind power converter is set to be in a state of prohibiting starting, and finally the non-failure wind power converter is restarted.
13. The control method of the parallel wind power converter system according to any of claims 6 to 9, characterized in that: the control method further comprises the step of limiting the power rising speed of the parallel wind power converter system through a variable pitch or yaw measure under the condition that the wind speed suddenly increases.
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| CN201911024327.1A CN110620516A (en) | 2019-10-25 | 2019-10-25 | Parallel wind power converter system and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865050A (en) * | 2020-08-12 | 2020-10-30 | 台达电子企业管理（上海）有限公司 | Current transformer |
| CN114389170A (en) * | 2022-01-20 | 2022-04-22 | 阳光电源股份有限公司 | Wind power converter |
-
2019
- 2019-10-25 CN CN201911024327.1A patent/CN110620516A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865050A (en) * | 2020-08-12 | 2020-10-30 | 台达电子企业管理（上海）有限公司 | Current transformer |
| CN114389170A (en) * | 2022-01-20 | 2022-04-22 | 阳光电源股份有限公司 | Wind power converter |
| CN114389170B (en) * | 2022-01-20 | 2024-04-12 | 阳光电源股份有限公司 | Wind power converter |
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Application publication date: 20191227 |