CN114499220A - AC-AC frequency converter and power system - Google Patents
AC-AC frequency converter and power system Download PDFInfo
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- CN114499220A CN114499220A CN202210337955.0A CN202210337955A CN114499220A CN 114499220 A CN114499220 A CN 114499220A CN 202210337955 A CN202210337955 A CN 202210337955A CN 114499220 A CN114499220 A CN 114499220A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 53
- 238000007599 discharging Methods 0.000 claims abstract description 31
- 238000010248 power generation Methods 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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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
- H02M5/02—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 without intermediate conversion into dc
- H02M5/04—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 without intermediate conversion into dc by static converters
- H02M5/22—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/297—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal for conversion of frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- 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
- H02M5/02—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 without intermediate conversion into dc
- H02M5/04—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 without intermediate conversion into dc by static converters
- H02M5/22—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Inverter Devices (AREA)
Abstract
The invention discloses an AC-AC frequency converter and an electric power system, wherein the AC-AC frequency converter comprises: the frequency conversion device comprises a plurality of chain-level energy leakage devices and a plurality of bridge arms, wherein the input end of each bridge arm is correspondingly connected with a first-phase alternating current bus of a first alternating current system, the output end of each bridge arm is connected with the same alternating current bus of a second alternating current system, each alternating current bus of the first alternating current system and each alternating current bus of the second alternating current system are respectively connected with the system-level energy leakage devices, each bridge arm comprises a plurality of cascade-connected frequency conversion modules, each frequency conversion module comprises a module-level energy leakage device and a frequency conversion circuit, the module-level energy leakage devices are connected in parallel and used for discharging redundant electric energy on the alternating current side of the first alternating current system and the second alternating current system, and the system-level energy leakage devices are used for discharging the redundant electric energy on the frequency conversion circuit, so that the system-level and module-level energy leakage is realized, and the safety of the alternating current-alternating current frequency converter is further improved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an alternating-current-alternating-current frequency converter and an electric power system.
Background
Energy is an important material basis for economic and social development, and the establishment of a safe, reliable, economic, efficient, clean and environment-friendly modern energy supply system is accelerated, so that the energy becomes a common strategic target of all countries in the world. In order to effectively solve the problems of energy exhaustion and environmental pollution, the development of new energy has become three challenges to energy safety, environmental pollution and climate change, and a necessary way for sustainable development of human society is realized. Wind power generation is one of the most mature and scaled power generation modes of a power generation device in new energy power generation technology. In some areas, wind power resource distribution and load centers are reversely distributed, and optimal allocation of resources is required to be realized through large-capacity long-distance power transmission. In order to realize a low-frequency power transmission function, a frequency conversion device is generally arranged on a power frequency side of an alternating current power grid, and the frequency conversion device obtains electric energy through the alternating current power grid on the power frequency side, but if the energy of the alternating current power grid on the power frequency side or the alternating current power grid on the low frequency side overshoots or the energy of the frequency conversion device overshoots, the alternating current power grids on the power frequency side and the low frequency side and the frequency conversion device are damaged.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that if the energy of the ac power grid at the power frequency side or the ac power grid at the low frequency side overshoots or the energy of the frequency conversion device overshoots, the ac power grid at the power frequency side or the ac power grid at the low frequency side or the frequency conversion device is damaged, thereby providing an ac-ac frequency converter and an electric power system.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides an ac-ac frequency converter, including: the frequency conversion device comprises a plurality of bridge arms, the input end of each bridge arm is correspondingly connected with a one-phase alternating current bus of a first alternating current system, and the output end of each bridge arm is connected with the same one-phase alternating current bus of a second alternating current system; each phase alternating current bus of the first alternating current system and each phase alternating current bus of the second alternating current system are connected with a system level energy leakage device; the bridge arm is composed of a plurality of cascade-connected frequency conversion modules, and each frequency conversion module is composed of a module-level energy leakage device and a frequency conversion circuit which are connected in parallel; the system level energy discharging device is used for discharging redundant electric energy at the alternating current sides of the first alternating current system and the second alternating current system; and the module-level energy discharging device is used for discharging redundant electric energy of the frequency conversion circuit.
In one embodiment, the ac-ac frequency converter further comprises: and each chain-level energy leakage device is connected with one bridge arm in parallel and is used for discharging redundant electric energy of the bridge arm.
In one embodiment, the ac-ac frequency converter further comprises: for each frequency conversion device, the input end of each bridge arm is correspondingly connected with a one-phase alternating current bus of a first alternating current system through a switch module, and/or the output end of each bridge arm is connected with the same alternating current bus of a second alternating current system through a switch module.
In one embodiment, the system level disabling device includes: a plurality of lightning arresters connected in parallel or in series, or a plurality of resistors connected in series in turn.
In one embodiment, the chain-level discharging apparatus includes: a plurality of lightning arresters connected in parallel or in series, or a plurality of resistors connected in series in turn.
In one embodiment, a module level disabling apparatus includes: a plurality of lightning arresters connected in parallel or in series, or a plurality of resistors connected in series in turn.
In one embodiment, the frequency conversion circuit is in a full-bridge structure, the full-bridge structure comprises two groups of switching device bridge arms and a direct current capacitor, the two groups of switching device bridge arms are connected in parallel, each group of switching device bridge arms comprises two switching devices connected in series, and the direct current capacitor is connected with the two groups of switching device bridge arms in parallel.
In one embodiment, the frequency conversion circuit is in a half-bridge structure, the half-bridge structure includes a set of switching device bridge arms and a dc capacitor, the set of switching device bridge arms includes two power electronic devices connected in series, and the dc capacitor is connected in parallel with the switching device bridge arms.
In a second aspect, an embodiment of the present invention provides an electric power system, including: the ac-ac converter, the first ac system, and the second ac system of the first aspect, wherein an input end of each bridge arm of each frequency conversion device of the ac-ac converter is correspondingly connected to a one-phase ac bus of the first ac system, and an output end of each bridge arm is connected to the same ac bus of the second ac system; the alternating-current and alternating-current frequency converter is used for converting the first frequency three-phase voltage of the first alternating-current system into the second frequency three-phase voltage and transmitting the second frequency three-phase voltage to the second alternating-current system.
In one embodiment, the first communication system includes: the system comprises a distribution station, and/or a power station, and/or a transformer substation, and/or a new energy power generation base.
In one embodiment, the second communication system includes: a plurality of offshore wind power plants, and/or a plurality of offshore solar power plants, and/or a plurality of offshore tidal power plants.
The technical scheme of the invention has the following advantages:
1. the invention provides an AC-AC frequency converter, wherein a frequency conversion device comprises a plurality of chain-level energy leakage devices and a plurality of bridge arms, the input end of each bridge arm is correspondingly connected with a first-phase alternating current bus of a first alternating current system, the output end of each bridge arm is connected with the same alternating current bus of a second alternating current system, each alternating current bus of the first alternating current system and each alternating current bus of the second alternating current system are both connected with a system-level energy leakage device, each bridge arm is composed of a plurality of cascade-connected frequency conversion modules, each frequency conversion module is composed of a module-level energy leakage device and a frequency conversion circuit which are connected in parallel, each system-level energy leakage device is used for discharging redundant electric energy at the alternating current sides of the first alternating current system and the second alternating current system, and each module-level energy leakage device is used for discharging redundant electric energy of the frequency conversion circuit, so that system-level and module-level energy leakage are realized, and the safety of the AC-AC frequency converter is further improved.
2. According to the alternating-current-alternating-current frequency converter, each bridge arm is connected with one chain-level energy-discharging device in parallel, and when the bridge arms are in fault, the chain-level energy-discharging devices are closed to eliminate redundant electric energy on the bridge arms, so that chain-level energy discharging is realized.
3. According to the power system provided by the invention, the AC-AC frequency converter is used for converting the three-phase voltage of the first frequency of the first AC system into the three-phase voltage of the second frequency, and comprises the system-level energy leakage device, the chain-level energy leakage device and the module-level energy leakage device, so that the energy overshoot between the two AC systems is effectively inhibited.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a specific example of an ac-ac frequency converter according to an embodiment of the present invention;
fig. 2 is a block diagram of another specific example of an ac-ac frequency converter according to an embodiment of the present invention;
fig. 3 is a block diagram of another specific example of an ac-ac frequency converter according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a specific example of a frequency conversion circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of another specific example of the frequency conversion circuit according to the embodiment of the present invention;
fig. 6 is a block diagram illustrating another exemplary embodiment of an ac-ac frequency converter according to an embodiment of the present invention;
fig. 7 is a composition diagram of a specific example of the power system according to the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides an ac-ac frequency converter, which is applied to occasions requiring frequency conversion power transmission, and as shown in fig. 1, the ac-ac frequency converter comprises: at least one frequency conversion device 1 and a plurality of system level energy discharging devices 2.
As shown in fig. 2, the frequency conversion apparatus 1 includes a plurality of arms 11, an input end of each arm 11 is correspondingly connected to a one-phase ac bus of the first ac system #1, and an output end of each arm 11 is connected to the same one-phase ac bus of the second ac system # 2; each phase alternating current bus of the first alternating current system and the second alternating current system is connected with the system level energy leakage device 2; the arm 11 is composed of a plurality of cascade-connected frequency conversion modules 111, and the frequency conversion module 111 is composed of a module-level energy discharging device 1111 and a frequency conversion circuit 1112 connected in parallel.
Specifically, referring to fig. 1 and fig. 2, it can be seen that the ac-ac frequency converter according to the embodiment of the present invention is a nine-phase frequency converter, each ac bus is connected to a system level energy-discharging device 2, and each frequency conversion circuit 1112 is connected in parallel to a module level energy-discharging device 1111, wherein when the ac bus is not overshot in energy, the frequency conversion circuit 1112 is not failed, and the bridge arm 11 is not failed, the system level energy-discharging device 2 and the module level energy-discharging device 1111 are both in an open state, when the ac bus is overshot in energy, the system level energy-discharging device 2 is closed to discharge the ac side surplus electric energy of the first ac system and the second ac system, and when the frequency conversion circuit 1112 is failed, the module level energy-discharging device 1111 is closed to discharge the surplus electric energy of the frequency conversion circuit 1112.
In addition, when the inverter circuit 1112 fails or the bridge arm 11 fails, the module-level energy discharging device 1111 may be closed to discharge the excess electric energy of the bridge arm 11 and the inverter circuit 1112, which is not limited herein.
The ac-ac frequency converter according to the embodiment of the present invention can convert the three-phase voltage of the first frequency of the first ac system into the three-phase voltage of the second frequency, where the first frequency may be smaller than the second frequency, and the ranges of the first frequency and the second frequency may be determined according to practical applications, so as to determine the operation state of each frequency conversion circuit 1112, and the operation state of the frequency conversion circuit 1112 is not limited to the switching frequency of the frequency conversion circuit 1112.
In one embodiment, as shown in fig. 3, the ac-ac frequency converter further includes: and each chain-level energy leakage device 12 is connected with one bridge arm 11 in parallel, and when the bridge arms 11 are in failure, the chain-level energy leakage devices 12 can be closed to discharge redundant electric energy.
In an embodiment, the system level discharging device 2, the chain level discharging device 12, and the module level discharging device 1111 of the embodiment of the present invention may have the same structure, and all of them may include: a plurality of lightning arresters connected in parallel or in series, or a plurality of resistors connected in series in turn.
It should be noted that, in addition to the above structure, the three energy discharging devices of the embodiment of the present invention may also include other devices for reducing voltage and consuming electric energy in the prior art, and the lightning arrester used in the embodiment of the present invention may be of a resistor sheet type or a gap type, which is not limited herein.
In a specific embodiment, as shown in fig. 4, the frequency converter circuit 1112 is a full-bridge structure, and the full-bridge structure includes two sets of switching device arms connected in parallel, each set of switching device arms includes two switching devices connected in series, and a dc capacitor connected in parallel with the two sets of switching device arms.
In a specific embodiment, as shown in fig. 5, the frequency conversion circuit 1112 is a half-bridge structure, and the half-bridge structure includes a set of switching device legs including two power electronic devices connected in series and a dc capacitor connected in parallel with the switching device legs.
The switching devices shown in fig. 4 and 5 are IGBTs with inverse parallel diodes, and the switching devices according to the embodiments of the present invention are not limited to IGBTs, but may be controllable power electronic switching devices such as MOSFETs, GTRs, GTOs, and the like, and are not limited herein.
In an embodiment, as shown in fig. 6, the ac-ac frequency converter further includes: for each frequency conversion device 1, the input end of each bridge arm 11 is correspondingly connected with a one-phase alternating current bus of a first alternating current system through one switch module 3, and/or the output end of each bridge arm 11 is connected with the same alternating current bus of a second alternating current system through one switch module.
The switch module in the embodiment of the present invention may be a power electronic switch or a mechanical switch, and the position of the switch module may be simultaneously arranged at the input end and the output end of the bridge arm 11, or only arranged at the input end of the bridge arm 11, or only arranged at the output end of the bridge arm 11, which is not limited herein.
Example 2
An embodiment of the present invention provides an electric power system, as shown in fig. 7, including: the ac-ac frequency converter 4, the first ac system 5, and the second ac system 6 of embodiment 1.
As shown in fig. 7, the ac-ac frequency converter 4 according to the embodiment of the present invention is a nine-phase frequency converter, an input end of each bridge arm 11 of each frequency conversion device 1 of the ac-ac frequency converter is correspondingly connected to a one-phase ac bus of the first ac system 5, and an output end of each bridge arm 11 is connected to the same ac bus of the second ac system 6; the ac-ac frequency converter 4 is configured to convert the first frequency three-phase voltage of the first ac system 5 into a second frequency three-phase voltage, and to transmit the second frequency three-phase voltage to the second ac system 6.
In one embodiment, the first communication system 5 comprises: the second ac system 6 comprises: a plurality of offshore wind power plants, and/or a plurality of offshore solar power plants, and/or a plurality of offshore tidal power plants.
Specifically, the new energy power generation base of the embodiment of the present invention is used to supply electric energy to the second ac system 6. The new energy power generation base can be a plurality of offshore wind power generation stations and/or a plurality of solar power generation stations and/or a plurality of tidal power generation stations, and as the new energy power generation base belongs to renewable energy sources, which are inexhaustible, new energy sources such as wind energy, solar energy or tidal energy and the like are comprehensively utilized, the consumption of other energy sources can be reduced, other energy sources can be saved to a great extent, and the wind energy, the solar energy or the tidal energy belongs to clean energy sources, so that the environmental pollution is less, and the healthy life of residents is favorably ensured. The second ac system 6 is mainly a power plant and/or a solar power plant and/or a tidal power plant which are arranged at sea, so that a new energy power generation base arranged at sea can provide electric energy for an ac power grid arranged on land, and the new energy on sea can be fully utilized, thereby saving more other electric energy.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (11)
1. An ac-to-ac frequency converter, comprising: at least one frequency conversion device and a plurality of system level energy discharge devices, wherein,
the frequency conversion device comprises a plurality of bridge arms, the input end of each bridge arm is correspondingly connected with a one-phase alternating current bus of the first alternating current system, and the output end of each bridge arm is connected with the same alternating current bus of the second alternating current system;
each phase alternating current bus of the first alternating current system and each phase alternating current bus of the second alternating current system are connected with a system level energy discharging device;
the bridge arm is composed of a plurality of cascade-connected frequency conversion modules, and each frequency conversion module is composed of a module-level energy leakage device and a frequency conversion circuit which are connected in parallel;
the system level energy discharging device is used for discharging redundant electric energy at the alternating current sides of the first alternating current system and the second alternating current system;
and the module-level energy discharge device is used for discharging redundant electric energy of the frequency conversion circuit.
2. The ac-to-ac frequency converter of claim 1, further comprising:
and each chain-level energy leakage device is connected with one bridge arm in parallel and is used for discharging redundant electric energy of the bridge arm.
3. The ac-to-ac frequency converter of claim 1, further comprising:
for each frequency conversion device, the input end of each bridge arm is correspondingly connected with a one-phase alternating current bus of a first alternating current system through a switch module, and/or the output end of each bridge arm is connected with the same alternating current bus of a second alternating current system through a switch module.
4. The ac-ac frequency converter according to claim 1, wherein the system level energy draining means comprises: a plurality of lightning arresters connected in parallel or in series, or a plurality of resistors connected in series in turn.
5. The ac-ac frequency converter according to claim 2, wherein the chain-stage energy-draining means comprises: a plurality of lightning arresters connected in parallel or in series, or a plurality of resistors connected in series in turn.
6. The ac-ac frequency converter according to claim 1, wherein the module level draining means comprises: a plurality of lightning arresters connected in parallel or in series, or a plurality of resistors connected in series in turn.
7. The ac-ac frequency converter according to claim 1, wherein the frequency conversion circuit is a full bridge structure, the full bridge structure comprises two sets of switching device legs connected in parallel, each set of switching device legs comprises two switching devices connected in series, and a dc capacitor connected in parallel with the two sets of switching device legs.
8. The ac-ac frequency converter according to claim 1, wherein the frequency conversion circuit is a half-bridge structure, the half-bridge structure comprises a set of switching device bridge arms and a dc capacitor, the set of switching device bridge arms comprises two power electronic devices connected in series, and the dc capacitor is connected in parallel with the switching device bridge arms.
9. An electrical power system, comprising: the AC-to-AC frequency converter, the first AC system, and the second AC system of any one of claims 1 to 8,
the input end of each bridge arm of each frequency conversion device of the alternating-current and alternating-current frequency converter is correspondingly connected with a one-phase alternating-current bus of a first alternating-current system, and the output end of each bridge arm is connected with the same alternating-current bus of a second alternating-current system;
the alternating-current and alternating-current frequency converter is used for converting the first frequency three-phase voltage of the first alternating-current system into a second frequency three-phase voltage and transmitting the second frequency three-phase voltage to the second alternating-current system.
10. The power system of claim 9, wherein the first ac system comprises: the system comprises a distribution station, and/or a power station, and/or a transformer substation, and/or a new energy power generation base.
11. The power system of claim 9, wherein the second ac system comprises: a plurality of offshore wind power plants, and/or a plurality of offshore solar power plants, and/or a plurality of offshore tidal power plants.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210337955.0A CN114499220A (en) | 2022-03-31 | 2022-03-31 | AC-AC frequency converter and power system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210337955.0A CN114499220A (en) | 2022-03-31 | 2022-03-31 | AC-AC frequency converter and power system |
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| CN114499220A true CN114499220A (en) | 2022-05-13 |
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| CN202210337955.0A Pending CN114499220A (en) | 2022-03-31 | 2022-03-31 | AC-AC frequency converter and power system |
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| US4855887A (en) * | 1987-09-30 | 1989-08-08 | Hitachi, Ltd. | Current and frequency converter having means to reduce switching losses |
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| CN110460272A (en) * | 2019-09-16 | 2019-11-15 | 江苏科技大学 | High power permanent magnet synchronous motor energy bleeder and control method |
| US20220085731A1 (en) * | 2019-02-28 | 2022-03-17 | Abb Power Grids Switzerland Ag | Converter Cell with Crowbar |
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2022
- 2022-03-31 CN CN202210337955.0A patent/CN114499220A/en active Pending
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|---|---|---|---|---|
| US4855887A (en) * | 1987-09-30 | 1989-08-08 | Hitachi, Ltd. | Current and frequency converter having means to reduce switching losses |
| CN104143775A (en) * | 2014-08-18 | 2014-11-12 | 国家电网公司 | Power electronic transformer substation |
| CN205509521U (en) * | 2015-12-31 | 2016-08-24 | 珠海清英智能电网研究院有限公司 | Adjusting device is synthesized to photovoltaic power generation system electric energy quality |
| US20220085731A1 (en) * | 2019-02-28 | 2022-03-17 | Abb Power Grids Switzerland Ag | Converter Cell with Crowbar |
| CN110112730A (en) * | 2019-05-15 | 2019-08-09 | 全球能源互联网研究院有限公司 | A kind of transmission system |
| CN110148963A (en) * | 2019-05-15 | 2019-08-20 | 全球能源互联网研究院有限公司 | A kind of more converting link AC-AC frequency converters based on energy storage |
| CN110460272A (en) * | 2019-09-16 | 2019-11-15 | 江苏科技大学 | High power permanent magnet synchronous motor energy bleeder and control method |
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