CN217904021U - Wind power generation system suitable for low-frequency power grid - Google Patents
Wind power generation system suitable for low-frequency power grid Download PDFInfo
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- CN217904021U CN217904021U CN202221219822.5U CN202221219822U CN217904021U CN 217904021 U CN217904021 U CN 217904021U CN 202221219822 U CN202221219822 U CN 202221219822U CN 217904021 U CN217904021 U CN 217904021U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A wind power generation system suitable for a low-frequency power grid comprises a first system and a second system, wherein in the first system, a first power supply conversion module is used for converting an input power supply and supplying power to a single plate of a frequency converter; the first auxiliary power conversion system comprises a frequency converter and a filter, and the frequency converter converts the low frequency of an input power supply into the power frequency of 50Hz after being electrified; the filter is used for filtering harmonic waves of an input power supply; the first system controls the grid-side converter to output a voltage of 16 Hz; in the second system, the first step-down transformer and the second step-down transformer are both used for converting the voltage of a power grid into 400V voltage, and the second power supply conversion module is used for converting the voltage output by the first step-down transformer into a power supply which can be used by a single plate of the frequency converter; the second auxiliary electrical conversion system is used for converting the low-frequency power grid voltage into a 50Hz voltage. The utility model discloses with low costs, sexual valence relative altitude.
Description
Technical Field
The utility model relates to a wind power generation system who is adapted to low frequency electric wire netting.
Background
In order to reduce the power loss of electric energy in the transmission process, the current state network gradually accelerates the process of low-frequency power transmission. For a wind power generation system, low-frequency power transmission means that the whole wind power generation system including a converter, a variable pitch propeller, yaw, master control power supply, illumination and the like can adapt to a low-frequency power supply. For the wind power generation system electrical equipment to be adapted to the low-frequency power supply, the mainstream method at present is to customize the low-frequency electrical equipment so as to match the low-frequency electrical equipment with the low-frequency power grid system. The customized equipment brings about difficulties in cost performance, reliability, supply chain, experimental verification, field verification and other factors.
Disclosure of Invention
In order to overcome the not enough of existing wind power generation system unable adaptation low frequency electric wire netting, the utility model provides a wind power generation system who is adapted to low frequency electric wire netting with low costs, the price/performance ratio is high.
The utility model provides a technical scheme that its technical problem adopted is:
a wind power generation system suitable for a low-frequency power grid comprises a first system and a second system, wherein the first system comprises a first power supply conversion module and a first auxiliary power conversion system, and the first power supply conversion module is used for converting an input power supply and supplying power to a single plate of a frequency converter; the first auxiliary power conversion system comprises a frequency converter and a filter, wherein the frequency converter converts a low frequency of an input power supply into a power frequency of 50Hz after being powered on; the filter is used for filtering out harmonic waves of the input power supply; the first system controls the grid-side converter to output a 16Hz voltage; the second system comprises a second auxiliary power conversion system, a second power conversion module, a first step-down transformer and a second step-down transformer, wherein the first step-down transformer and the second step-down transformer are both used for converting the voltage of a power grid into 400V voltage; the second power conversion module is used for converting the voltage output by the first step-down transformer into a power supply which can be used by a single plate of the frequency converter; the second auxiliary power conversion system is used for converting the low-frequency power grid voltage into a 50Hz voltage.
Furthermore, the first step-down transformer is used for converting the voltage of the power grid and then used as the input of the second power conversion module, and the second step-down transformer is used for converting the output voltage of the auxiliary power conversion system into the voltage which can be used by the whole fan system.
The beneficial effects of the utility model are that: (1) The low-frequency operation is met on the premise of not adjusting the original system too much. And (2) the low-frequency device does not need to be customized. (3) Two sets of systems are formed according to the low-frequency adaptability of the electric equipment except the converter, so that unnecessary cost is effectively reduced.
Drawings
Fig. 1 is a topological diagram of a wind power system adapted to a low frequency grid.
Fig. 2 is a first system topology diagram.
Fig. 3 is a second system topology.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 3, a wind power generation system adapted to a low-frequency power grid includes a first system and a second system, where the first system includes a first power conversion module and a first auxiliary power conversion system, and the first power conversion module is configured to convert an input power and supply power to a single board of a frequency converter; the first auxiliary power conversion system comprises a frequency converter and a filter, wherein the frequency converter converts a low frequency of an input power supply into a power frequency of 50Hz after being powered on; the filter is used for filtering out harmonic waves of the input power supply; the first system controls the grid-side converter to output a 16Hz voltage; the second system comprises a second auxiliary power conversion system, a second power conversion module, a first step-down transformer and a second step-down transformer, wherein the first step-down transformer and the second step-down transformer are both used for converting the voltage of a power grid into 400V voltage; the second power conversion module is used for converting the voltage output by the first step-down transformer into a power supply which can be used by a single plate of the frequency converter; the second auxiliary power conversion system is used for converting the low-frequency power grid voltage into a 50Hz voltage.
The first step-down transformer is used for converting the voltage of the power grid and then used as the input of the second power conversion module, and the second step-down transformer is used for converting the output voltage of the auxiliary power conversion system into the voltage which can be used by the whole fan system.
In this embodiment, the first system refers to a fan system in which pitch, yaw, master control power supply, illumination, and the like are all adaptable to low frequencies; the second system refers to the condition that variable pitch, yaw, master control power supply, illumination and the like in the fan system cannot adapt to low frequency.
The grid voltage of the embodiment is 690V, and other grid voltage levels such as 1140V can be adopted. Referring to fig. 1, in the topology of the wind power generation system, the left side is the grid voltage input, which is followed by the grid lightning protection module, 690VAC user auxiliary power, an auxiliary power transformer, and a breaker. The 690VAC user auxiliary power is used for supplying power to equipment such as variable pitch equipment, yaw equipment, master control power supply equipment and lighting equipment; the auxiliary transformer is used for supplying power to a UPS, a heating and dehumidifying power supply, a 400VAC fan power supply and the like in the converter; the double-fed motor and the converter are connected to the right side of the circuit breaker. The system is suitable for the power grid voltage with the power frequency of 50Hz, and when the low-frequency power grid is promoted to be built from the perspective of reducing the transmission loss, the wind power generation system with the original operation frequency of 50Hz is not suitable any more due to different frequencies. The original topological structure is optimized, so that the topological structure is suitable for low-frequency power grid voltage on the premise of minimum change.
When the user auxiliary power side equipment can meet the low-frequency 16Hz operation, as shown in FIG. 2, and the input and output frequency of the converter side can be set in a reasonable range, only the power supply voltage as the converter side equipment needs to be optimized. As shown in the figure, the 400V/16Hz voltage converted by the auxiliary transformer supplies power to the single plate of the frequency converter after passing through the power conversion module, then the frequency converter works to convert the 16Hz alternating current into the 50Hz alternating current, and the alternating current is filtered by the filter to be used as the power supply of the converter equipment.
When the user auxiliary side equipment cannot meet the low-frequency 16Hz operation, as shown in FIG. 3, the input/output power of the whole wind power generation system needs to be subjected to frequency conversion. As shown in the figure, the 690V/16Hz alternating current on the power grid side is reduced to 400V/16Hz through a first step-down transformer, and then the alternating current is used as the power supply of the single plate of the frequency converter through a power supply conversion module. The frequency converter works to convert 690V/16Hz to 690V/50Hz, and input/output harmonic waves are reduced through the filter. And then the power supply is divided into two paths, one path is used as 690V user auxiliary power, namely, used as a power supply of equipment for pitch control, yaw control, main control power supply, illumination and the like, and the other path is connected with a second step-down transformer and used as a power supply of user equipment on the converter side after converting 690V/50Hz into 400V/50 Hz.
The embodiments described in this specification are merely examples of implementations of the inventive concepts, which are intended for illustrative purposes only. The scope of the present invention should not be construed as being limited to the specific forms set forth in the following description, but rather should be construed as encompassing all the equivalent technical means which may be conceived by one of ordinary skill in the art based on the teachings of the present invention.
Claims (2)
1. A wind power generation system suitable for a low-frequency power grid is characterized by comprising a first system and a second system, wherein the first system comprises a first power conversion module and a first auxiliary power conversion system, and the first power conversion module is used for converting an input power and supplying power to a single plate of a frequency converter; the first auxiliary power conversion system comprises a frequency converter and a filter, wherein the frequency converter converts a low frequency of an input power supply into a power frequency of 50Hz after being powered on; the filter is used for filtering out harmonic waves of the input power supply; the first system controls the grid-side converter to output a 16Hz voltage; the second system comprises a second auxiliary power conversion system, a second power conversion module, a first step-down transformer and a second step-down transformer, wherein the first step-down transformer and the second step-down transformer are both used for converting the voltage of a power grid into 400V voltage, and the second power conversion module is used for converting the voltage output by the first step-down transformer into a power supply which can be used by a single plate of the frequency converter; the second auxiliary power conversion system is used for converting the low-frequency power grid voltage into a 50Hz voltage.
2. The wind power generation system adapted to the low frequency power grid according to claim 1, wherein the first step-down transformer is used for converting the grid voltage as an input of the second power conversion module, and the second step-down transformer is used for converting the output voltage of the auxiliary power conversion system into a voltage available for the whole wind turbine system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221219822.5U CN217904021U (en) | 2022-05-20 | 2022-05-20 | Wind power generation system suitable for low-frequency power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221219822.5U CN217904021U (en) | 2022-05-20 | 2022-05-20 | Wind power generation system suitable for low-frequency power grid |
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| Publication Number | Publication Date |
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| CN217904021U true CN217904021U (en) | 2022-11-25 |
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| CN202221219822.5U Active CN217904021U (en) | 2022-05-20 | 2022-05-20 | Wind power generation system suitable for low-frequency power grid |
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- 2022-05-20 CN CN202221219822.5U patent/CN217904021U/en active Active
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