CN111987739A - Wind power converter - Google Patents
Wind power converter Download PDFInfo
- Publication number
- CN111987739A CN111987739A CN202010702086.8A CN202010702086A CN111987739A CN 111987739 A CN111987739 A CN 111987739A CN 202010702086 A CN202010702086 A CN 202010702086A CN 111987739 A CN111987739 A CN 111987739A
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- Prior art keywords
- direct current
- grid
- side converter
- converter
- wind power
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- 230000005284 excitation Effects 0.000 claims abstract description 56
- 238000004804 winding Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000002360 preparation method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- 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
Abstract
The application discloses a wind power converter, which comprises a machine side converter, a direct current bus capacitor, a positive direct current bus, a negative direct current bus and a grid side converter, wherein the alternating current end of the machine side converter is connected with a stator winding of a generator, and the alternating current end of the grid side converter is connected with a power grid; one end of the direct current bus capacitor is connected with the positive direct current bus, and the other end of the direct current bus capacitor is connected with the negative direct current bus; the wind power converter also comprises a direct current-direct current conversion excitation module; the input end of the DC-DC conversion excitation module is connected with the DC bus capacitor in parallel, and the output end of the DC-DC conversion excitation module is connected with the rotor winding of the generator. According to the excitation system, the excitation current is provided for the stator winding of the generator through the direct current-direct current conversion excitation module, the condition that the power grid is not powered off when the excitation system is overhauled is avoided, the cost of the system is reduced, and the electric energy is saved.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a wind power converter.
Background
As shown in fig. 1-2, the wind power converter based on the electrically excited machine includes a fan, a generator, a machine-side converter, a dc bus, a grid-side converter and an excitation module. When in operation, the three-phase alternating voltage of the power grid provides direct-current excitation for a rotor winding of the electrically excited motor after alternating-current and direct-current conversion of the excitation module; in order to monitor the idle running condition of the fan during standby, the electric energy needs to be provided for the excitation module under the condition that the power grid is not powered off, so that the dependence on the power grid cannot be avoided and the electric energy is consumed simultaneously when fan equipment is overhauled.
Disclosure of Invention
In view of this, an object of the present application is to provide a wind power converter, so as to solve the problem that the existing wind power converter needs to provide electric energy for an excitation module under the condition that a power grid is not powered off in order to monitor the idle running condition of a fan when the existing wind power converter is in a standby state.
The technical scheme adopted by the application for solving the technical problems is as follows:
according to one aspect of the application, a wind power converter is provided, which comprises a machine side converter, a direct current bus capacitor, a positive direct current bus, a negative direct current bus and a grid side converter, wherein an alternating current end of the machine side converter is connected with a stator winding of a generator, and an alternating current end of the grid side converter is connected with a power grid; one end of the direct current bus capacitor is connected with the positive direct current bus, and the other end of the direct current bus capacitor is connected with the negative direct current bus;
the wind power converter also comprises a direct current-direct current conversion excitation module; the input end of the DC-DC conversion excitation module is connected with the DC bus capacitor in parallel, and the output end of the DC-DC conversion excitation module is connected with the rotor winding of the generator.
In one embodiment, the wind power converter further comprises a controller configured to:
and controlling the machine side converter and the grid side converter to operate so that the voltage between the positive direct current bus and the negative direct current bus is subjected to direct current conversion of the direct current-direct current conversion excitation module to provide excitation current for a rotor winding of the generator.
In one embodiment, the controller is further configured to:
and controlling the machine side converter and the grid side converter to stop running so as to provide exciting current for a rotor winding of the generator by utilizing residual voltage between the positive direct current bus and the negative direct current bus.
In one embodiment, the controller is further configured to:
before the machine side converter and the grid side converter are controlled to stop running, the connection between the alternating current end of the grid side converter and the power grid is controlled to be disconnected.
In one embodiment, a grid-side filter is further connected between the ac terminal of the grid-side converter and the grid.
In one embodiment, a machine side filter is also connected between the ac terminal of the machine side converter and the stator winding of the generator.
In one embodiment, the dc bus capacitor is composed of a plurality of capacitors connected in series and/or in parallel.
In one embodiment, the machine-side converter and the grid-side converter are both PWM converters.
The wind power converter provided by the embodiment of the application provides exciting current for the stator winding of the generator through the direct current-direct current conversion excitation module, avoids providing electric energy for the excitation module under the condition that a power grid is not powered off when overhauling, reduces the cost of a system, and saves the electric energy.
Drawings
FIG. 1 is a schematic diagram of a conventional wind power converter;
fig. 2 is a schematic diagram of standby excitation of a conventional wind power converter;
fig. 3 is a schematic diagram of a wind power converter provided in the embodiment of the present application;
fig. 4 is a schematic diagram of standby excitation of a wind power converter provided in an embodiment of the present application;
fig. 5 is another schematic diagram of standby excitation of a wind power converter provided in an embodiment of the present application.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example one
As shown in fig. 3, an embodiment of the present application provides a wind power converter, which includes a machine-side converter, a dc bus capacitor C1, a positive dc bus (shown as "+", in the figure), a negative dc bus (shown as "-"), and a grid-side converter, where an ac terminal of the machine-side converter is connected to a stator winding of a generator, the generator is connected to a fan, and an ac terminal of the grid-side converter is connected to a power grid; one end of the direct current bus capacitor C1 is connected with the positive direct current bus, and the other end of the direct current bus capacitor C1 is connected with the negative direct current bus;
the wind power converter also comprises a direct current-direct current conversion excitation module (shown as a DC-DC excitation module in the figure); the input end of the DC-DC conversion excitation module is connected with the DC bus capacitor C1 in parallel, and the output end of the DC-DC conversion excitation module is connected with the rotor winding of the generator.
In one embodiment, the wind power converter further comprises a controller configured to:
and controlling the machine side converter and the grid side converter to operate so that the voltage between the positive direct current bus and the negative direct current bus is subjected to direct current conversion of the direct current-direct current conversion excitation module to provide excitation current for a rotor winding of the generator.
In one embodiment, the controller is further configured to:
and controlling the machine side converter and the grid side converter to stop running so as to provide exciting current for a rotor winding of the generator by utilizing residual voltage between the positive direct current bus and the negative direct current bus.
In one embodiment, the controller is further configured to:
before the machine side converter and the grid side converter are controlled to stop running, the connection between the alternating current end of the grid side converter and the power grid is controlled to be disconnected.
In one embodiment, a grid-side filter is further connected between the ac terminal of the grid-side converter and the grid.
In one embodiment, a machine side filter is also connected between the ac terminal of the machine side converter and the stator winding of the generator.
In one embodiment, the dc bus capacitor is composed of a plurality of capacitors connected in series and/or in parallel.
In one embodiment, the machine-side converter and the grid-side converter are both PWM converters.
The following describes a control process of the wind power converter:
during operation, the direct current bus voltage Vdc supplies exciting current to a rotor winding of the generator through the DC-DC excitation module, compared with the AC-DC excitation module shown in the figures 1-2, the DC-DC excitation module is lower in cost and simpler in excitation control, and meanwhile, the structure avoids the excitation module from being connected with a power grid in a long distance, can be directly connected with the direct current bus short-distance wiring of the wind power converter, and is more energy-saving and efficient.
As shown in fig. 4, during maintenance, the grid voltage may be cut off first, the machine side converter and the grid side converter are shut down, a large amount of residual magnetism still remains in the generator magnetic steel within a period of time after grid connection is stopped, and meanwhile, the direct current bus voltage natural discharge process is slow, and the residual voltage of the direct current bus can still be used for supporting a period of time to provide direct current excitation for the rotor winding of the generator, so that the stator winding of the generator generates induced voltage, and the induced voltage automatically charges the direct current bus after uncontrolled rectification of the machine side converter, and the process is repeated.
Therefore, when the generator is not connected to the grid in an idling mode, the rotor winding of the generator still has uninterrupted excitation, and the stator winding induces uninterrupted stator voltage, so that the no-load running condition of the generator can be detected by observing the stator voltage, the actual energy consumption of the whole generator, including the fact that the excitation energy is generated by the fan in an idling mode, the utilization rate of the fan is increased, and meanwhile the dependence on a power grid is eliminated.
Example two
Taking a 2MW electric excitation unit of a certain wind power plant of Gansu Wuwei as an example, the full-year fault-free operation is 8474 hours, the standby time is 2052 hours, the impedance of a generator rotor is 10 ohms, the rated excitation current is 80A, and the standby minimum excitation current is 30A.
As shown in fig. 5, if the conventional standby excitation scheme is adopted, the grid side of the converter starts the stable bus voltage, the excitation loop starts the minimum excitation for monitoring the state of the fan, and the excitation loss power of the motor is about 9 kW. Because the grid-side converter is started to operate, the auxiliary power loss power is about 7kW in consideration of the operation loss of a control loop, a power loop, an internal fan, a water cooler and the like of the converter. Therefore, the standby excitation loss power is about 16kW, the annual standby excitation loss electric quantity of the single unit is 32828kWh, that is, the unit needs to consume 3.28 ten thousand kilowatts from the power grid to maintain standby operation under the standby condition every year, and serious electric energy waste is caused.
As can be understood by referring to fig. 4, if the standby excitation scheme of the present application is adopted, the grid-side converter is shut down/disconnected in the standby state, the machine-side converter performs uncontrolled rectification through the freewheeling diode to establish the DC bus voltage, and the DC-DC excitation module takes power from the DC bus to perform DC excitation on the generator rotor without consuming the power of the power grid. Because the uncontrolled rectifying loss of the diodes is small, the water cooling machine does not need to operate, the power module adopts natural air cooling for heat dissipation, and the auxiliary power loss is only 1.2 kW. Therefore, the annual standby loss of the unit is only 2462 kilowatt hours, and compared with the traditional mode, the unit can save energy by about 30364 kilowatt hours in a single year.
| Single machine | Duration of power generation (h) | Excitation loss (kW) | Auxiliary power loss (kW) | Total power loss (kW) | Annual energy loss (kWh) |
| Conventional solutions | 2052 | 9 | 7 | 16 | 32828 |
| The scheme of the application | 2052 | 0 | 1.2 | 1.2 | 2462 |
Considering 500 wind farms installed, the annual energy saving is about 1518.2 ten thousand kilowatt-hours.
The wind power converter provided by the embodiment of the application provides exciting current for the stator winding of the generator through the direct current-direct current conversion excitation module, avoids providing electric energy for the excitation module under the condition that a power grid is not powered off when overhauling, reduces the cost of a system, and saves the electric energy.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and are not intended to limit the scope of the claims of the application accordingly. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present application are intended to be within the scope of the claims of the present application.
Claims (8)
1. A wind power converter comprises a machine side converter, a direct current bus capacitor, a positive direct current bus, a negative direct current bus and a grid side converter, wherein the alternating current end of the machine side converter is connected with a stator winding of a generator, and the alternating current end of the grid side converter is connected with a power grid; one end of the direct current bus capacitor is connected with the positive direct current bus, and the other end of the direct current bus capacitor is connected with the negative direct current bus; it is characterized in that the preparation method is characterized in that,
the wind power converter also comprises a direct current-direct current conversion excitation module; the input end of the DC-DC conversion excitation module is connected with the DC bus capacitor in parallel, and the output end of the DC-DC conversion excitation module is connected with the rotor winding of the generator.
2. The wind power converter of claim 1, further comprising a controller configured to:
and controlling the machine side converter and the grid side converter to operate so that the voltage between the positive direct current bus and the negative direct current bus is subjected to direct current conversion of the direct current-direct current conversion excitation module to provide excitation current for a rotor winding of the generator.
3. The wind power converter of claim 2, wherein the controller is further configured to:
and controlling the machine side converter and the grid side converter to stop running so as to provide exciting current for a rotor winding of the generator by utilizing residual voltage between the positive direct current bus and the negative direct current bus.
4. The wind power converter of claim 3, wherein the controller is further configured to:
before the machine side converter and the grid side converter are controlled to stop running, the connection between the alternating current end of the grid side converter and the power grid is controlled to be disconnected.
5. The wind power converter according to any of claims 1 to 4, wherein a grid-side filter is further connected between the AC end of the grid-side converter and the grid.
6. Wind power converter according to any of claims 1-4, characterized in that a machine side filter is connected between the ac side of the machine side converter and the stator winding of the generator.
7. Wind power converter according to any of claims 1-4, characterized in that said DC bus capacitor is composed of a plurality of capacitors connected in series and/or in parallel.
8. Wind power converter according to any of claims 1-4, characterized in that said machine side converter and said grid side converter are both PWM converters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010702086.8A CN111987739A (en) | 2020-07-20 | 2020-07-20 | Wind power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010702086.8A CN111987739A (en) | 2020-07-20 | 2020-07-20 | Wind power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111987739A true CN111987739A (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010702086.8A Pending CN111987739A (en) | 2020-07-20 | 2020-07-20 | Wind power converter |
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| Country | Link |
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| CN (1) | CN111987739A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208960A (en) * | 2012-01-16 | 2013-07-17 | 台达电子企业管理（上海）有限公司 | Excitation control circuit and electric excitation wind power system thereof |
| US20160285399A1 (en) * | 2015-03-24 | 2016-09-29 | Delta Electronics, Inc. | Wind power generation system and control method thereof |
| US20180187652A1 (en) * | 2017-01-05 | 2018-07-05 | General Electric Company | Power Converter for Full Conversion Wind Turbine Systems |
-
2020
- 2020-07-20 CN CN202010702086.8A patent/CN111987739A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208960A (en) * | 2012-01-16 | 2013-07-17 | 台达电子企业管理（上海）有限公司 | Excitation control circuit and electric excitation wind power system thereof |
| US20160285399A1 (en) * | 2015-03-24 | 2016-09-29 | Delta Electronics, Inc. | Wind power generation system and control method thereof |
| US20180187652A1 (en) * | 2017-01-05 | 2018-07-05 | General Electric Company | Power Converter for Full Conversion Wind Turbine Systems |
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