CN115378021B - Offshore flexible-straight main wiring system and starting method thereof - Google Patents
Offshore flexible-straight main wiring system and starting method thereof Download PDFInfo
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- CN115378021B CN115378021B CN202211306293.7A CN202211306293A CN115378021B CN 115378021 B CN115378021 B CN 115378021B CN 202211306293 A CN202211306293 A CN 202211306293A CN 115378021 B CN115378021 B CN 115378021B
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention relates to a marine flexible-direct main wiring system and a starting method thereof, wherein the marine flexible-direct main wiring system comprises a connecting transformer; the connection transformer network side winding is connected with a first isolating switch through a lightning arrester and a first grounding switch, the first isolating switch is connected with a second isolating switch through a second grounding switch, a connection transformer network side alternating current circuit breaker and a third grounding switch, the first isolating switch is connected with the second isolating switch through a starting circuit, and the second isolating switch is connected with an alternating current power grid through a fourth grounding switch; the network side winding of the connecting transformer is connected in parallel with the neutral point arrester at the network side of the connecting transformer and a first current transformer; the valve side winding of the connecting transformer is connected with a grounding reactor loop and a connecting transformer side current transformer through a connecting transformer side lightning arrester, a connecting transformer side voltage transformer, a fifth grounding switch, a third isolating switch and a sixth grounding switch, the connecting transformer side lightning arrester is connected with a second current transformer, the connecting transformer side current transformer is connected with a current converter through a through-wall bushing, and the connecting transformer side current transformer can be used in the field of power transmission.
Description
Technical Field
The invention relates to the field of flexible direct current transmission, in particular to an offshore flexible direct current main wiring system and a starting method thereof.
Background
With the continuous expansion of the capacity of wind power plants and the increasing distance from the shore, a flexible direct current sending mode based on MMC-HVDC (modular multilevel converter type high-voltage direct current transmission) becomes a mode which is developed rapidly and has the widest application at present, and in recent years, the flexible direct current sending mode is almost adopted in the engineering of construction and operation of Germany. The soft and direct wind power transmission project in Jiangsu east China is a far-sea wind power soft and direct project with the highest world voltage level and the largest capacity, is also the first soft and direct wind power transmission project in China, and has important milestone significance in China and the far-sea wind power development history in the world.
The flexible direct current sending project of the offshore wind power has high requirements on light compact design and is a core factor influencing the project investment economy. The traditional flexible direct current system is respectively provided with a closing resistor and a starting resistor on the network side and the valve side of a connecting transformer and respectively used for limiting the magnetizing inrush current of the connecting transformer and the charging current of a converter valve, and the configuration mode is provided with more switches and resistance equipment, so that the system is large in occupied area, high in investment and poor in reliability; on the other hand, the connecting transformer and the converter valve can be started simultaneously under normal conditions, the combined design of a closing resistor and a starting resistor can be realized, and the independent starting of the connecting transformer can be realized by arranging an isolating switch before the connecting transformer and the converter valve under special conditions.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide an offshore flexible direct main wiring system and a starting method thereof with reliability, flexibility and economy.
In order to achieve the purpose, the invention adopts the following technical scheme: in one aspect, an offshore flexible-direct main wiring system is provided, including a coupling transformer;
the network side winding of the connecting transformer is connected with one end of a first isolating switch through a lightning arrester and one end of a first grounding switch, the other end of the first isolating switch is connected with one end of a second isolating switch through one end of a second grounding switch, one end of a connecting transformer network side alternating current circuit breaker and one end of a third grounding switch in sequence, the other end of the first isolating switch is further connected with one end of the second isolating switch through a starting circuit, and the other end of the second isolating switch is connected with an alternating current power grid through one end of a fourth grounding switch;
the network side winding of the connecting transformer is also connected with a network side neutral point arrester and a first current transformer in parallel;
a valve side winding of the connecting transformer is connected with a grounding reactor loop and one end of a connecting variable valve side current transformer in parallel sequentially through one end of a connecting variable valve side lightning arrester, one end of a connecting variable valve side voltage transformer, one end of a fifth grounding switch, one end of a third isolating switch and one end of a sixth grounding switch, the other end of the connecting variable valve side lightning arrester is connected with one end of a second current transformer, and the other end of the connecting variable valve side current transformer is connected with a current converter through a wall bushing;
the other ends of the first grounding switch, the second grounding switch, the third grounding switch, the fourth grounding switch, the sixth grounding switch, the lightning arrester, the neutral point lightning arrester connected with the transformer side, the first current transformer, the second current transformer, the voltage transformer connected with the transformer side and the grounding reactor are all directly grounded.
Further, the starting circuit comprises a starting resistor, a third current transformer, a seventh grounding switch and a fourth isolating switch;
one end of the starting resistor is connected with the first isolating switch and the second grounding switch in parallel, and the other end of the starting resistor is connected with the second isolating switch and the third grounding switch in parallel sequentially through the third current transformer, one end of the seventh grounding switch and the fourth isolating switch.
Furthermore, the grounding reactor loop comprises a grounding loop inductor, a grounding resistor, a fourth current transformer, a fifth current transformer and a grounding resistor arrester;
one end of the grounding loop inductor is connected with the sixth grounding switch in parallel and is connected with the variable valve side current transformer, the other end of the grounding loop inductor is connected with one end of the grounding resistor and one end of the grounding resistor arrester in parallel through the fourth current transformer, the other end of the grounding resistor is connected with one end of the fifth current transformer, and the other ends of the fifth current transformer and the grounding resistor arrester are directly grounded.
Further, the coupling transformer adopts a three-winding structure.
Furthermore, the grid side winding of the connection transformer is star-shaped, and the valve side winding and the third winding of the connection transformer are both triangular.
Further, the actual energy value of the starting resistor is determined through electromagnetic simulation in consideration of the influence of excitation inrush current of the excitation transformer and charging current of the converter valve.
In another aspect, a starting method based on an offshore flexible direct main wiring system is provided, and includes:
in normal operation with the coupling transformer having been operational reliability verified,
the offshore flexible direct-current main wiring system is put into a hot standby state, and a connecting transformer and a current converter are charged;
the AC circuit breaker on the network side of the transformer is connected in a closed mode, and the offshore flexible-direct main wiring system enters a formal operation stage;
and under the operation condition that the connection transformer is put into operation again after troubleshooting, independently verifying the operation reliability of the connection transformer, and charging the connection transformer by putting the marine flexible-direct main wiring system into a hot standby state.
Further, still include:
after the operation reliability of the coupling transformer is verified, if the offshore flexible-direct main wiring system needs to be started, the coupling transformer is powered off again to execute the starting process under the normal operation condition.
Further, the flexible direct main wiring system on the sea enters into hot standby state, charges connecting transformer and transverter, includes:
closing a first isolating switch and a second isolating switch which are connected with a transformer network side and a third isolating switch which is connected with a transformer valve side, and enabling the marine flexible direct-current main wiring system to enter a hot standby state;
and closing a starting loop connected with the network side of the transformer, and connecting the transformer with the current converter for charging.
Further, the entering of the marine flexible direct main wiring system into a hot standby state for charging the connection transformer includes:
disconnecting the third isolating switch connected with the transformer valve side, closing the first isolating switch and the second isolating switch connected with the transformer network side, and enabling the offshore flexible direct-current main wiring system to enter a hot standby state;
and closing a starting loop connected with the network side of the transformer, and connecting the transformer for charging.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the traditional flexible direct current system is provided with a switch-on resistor and a starting resistor on the network side and the valve side of the transformer respectively, more switches and resistor devices can be configured, and the method has the advantages of high investment and poor reliability.
2. The invention cancels the switch-on resistance and the starting resistance which are configured on the network side and the valve side of the connecting transformer in the traditional flexible direct current system, designs a new resistance wiring scheme which comprehensively limits the excitation inrush current and the converter valve impulse current of the connecting transformer on the network side of the connecting transformer, and the configuration mode can save part of switches and resistance equipment, has small occupied area, low investment and high reliability, and is suitable for the offshore flexible direct current system with high compactness requirement.
3. The connecting transformer and the converter valve can be started simultaneously under normal conditions, the combined design of a closing resistor and a starting resistor can be realized, the independent starting of the connecting transformer can be realized through the isolating switch arranged before the connecting transformer and the converter valve under special conditions, and various operation modes required by an offshore flexible direct current system can be well adapted.
In conclusion, the invention can be widely applied to the field of flexible direct current transmission.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a switching resistor and a starting resistor respectively configured on a network side and a valve side of a connecting transformer in the prior art;
fig. 2 is a schematic structural diagram of a main wiring system configuration according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "upper", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
As shown in fig. 1, a connection mode in which a closing resistor R1 and a starting resistor R2 are respectively configured on a network side and a valve side of a connection transformer in the prior art is shown, wherein T1 to T7 are all current transformers, F1 to F4 are all lightning arresters, Q11 to Q17 are all ground switches, Q21 to Q24 are all isolating switches, X1 is a wall bushing, and R1 and R2 are all resistors, as shown in fig. 2, the marine flexible-straight main connection system provided in the embodiment of the present invention mainly distinguishes the following aspects with respect to the connection mode in fig. 1: the invention cancels the switch-on resistance and the starting resistance configured on the network side and the valve side of the traditional flexible direct current system connecting transformer, designs a new resistance wiring scheme for comprehensively limiting the magnetizing inrush current and the converter valve impulse current of the connecting transformer on the network side of the connecting transformer, namely the starting resistance R1 and the series-parallel equipment thereof in figure 2, and the configuration mode saves partial switches and resistance equipment, has small occupied area, low investment and high reliability.
Example 1
As shown in fig. 2, the present embodiment provides an offshore flexible direct main connection system, which includes an arrester F1 (three phases a, b, and c) disposed in a grid-side ac field area, a start circuit, a network-side ac breaker Q1 (three phases a, b, and c) connected to a transformer, a first grounding switch Q11 (three phases a, b, and c), a second grounding switch Q12 (three phases a, b, and c), a third grounding switch Q13 (three phases a, b, and c), a fourth grounding switch Q14 (three phases a, b, and c), a first disconnecting switch Q21 (three phases a, b, and c), and a second disconnecting switch Q22 (three phases a, b, and c), a connecting transformer TR (a, b and c three phases) arranged in a valve side AC field area, a connecting transformer side neutral point arrester F2, a connecting transformer side arrester F3 (a, b and c three phases), a first current transformer T1 (a, b and c three phases), a second current transformer T2, a connecting transformer side current transformer T6 (a, b and c three phases), a fifth grounding switch Q15 (a, b and c three phases), a sixth grounding switch Q16 (a, b and c three phases), a third isolating switch Q23 (a, b and c three phases), a connecting transformer side voltage transformer PT1 (a, b and c three phases), a grounding reactor loop and a wall bushing X1 (a, b and c three phases), and an inverter (a, b and c three phases) arranged in a valve hall area, wherein the starting loop comprises a starting resistor R1 (a, b and c three phases), a third current transformer T3 (a, b and c three phases), b. Three phases c), a seventh grounding switch Q17 (three phases a, b and c) and a fourth isolating switch Q24 (three phases a, b and c), the grounding reactor loop comprises a grounding loop inductor L1 (three phases a, b and c), a grounding resistor R2, a fourth current transformer T4 (three phases a, b and c), a fifth current transformer T5 and a grounding resistor arrester F4.
The network side winding of the connecting transformer TR is connected with one end of a first isolating switch Q21 through a lightning arrester F1 and one end of a first grounding switch Q11, the other end of the first isolating switch Q21 sequentially passes through one end of a second grounding switch Q12, one end of a connecting transformer network side alternating current circuit breaker Q1 and one end of a third grounding switch Q13 are connected with one end of a second isolating switch Q22, the other end of the first isolating switch Q21 sequentially passes through a starting resistor R1, a third current transformer T3, one end of a seventh grounding switch Q17 and a fourth isolating switch Q24 to be connected with one end of the second isolating switch Q22, and the other end of the second isolating switch Q22 is connected with an alternating current power grid through one end of a fourth grounding switch Q14.
And the grid side winding of the connecting transformer TR is also connected with a neutral point lightning arrester F2 at the transformer side and a first current transformer T1 in parallel.
The valve side winding of the connecting transformer TR is connected with one end of a variable valve side lightning arrester F3, a variable valve side voltage transformer PT1, one end of a fifth grounding switch Q15, a third isolating switch Q23 and one end of a sixth grounding switch Q16 in parallel connection with a grounding loop inductor L1 and one end of a variable valve side current transformer T6 in sequence, the other end of the variable valve side lightning arrester F3 is connected with one end of a second current transformer T2, the other end of the grounding loop inductor L1 is connected with one end of a grounding resistor R2 and one end of a grounding resistor lightning arrester F4 in parallel connection through a fourth current transformer T4, the other end of the grounding resistor R2 is connected with one end of a fifth current transformer T5, and the other end of the variable valve side current transformer T6 is connected with the converter through a wall bushing X1.
The other ends of the first grounding switch Q11, the second grounding switch Q12, the third grounding switch Q13, the fourth grounding switch Q14, the fifth grounding switch Q15, the sixth grounding switch Q16, the seventh grounding switch Q17, the lightning arrester F1, the connection transformer side neutral point lightning arrester F2, the grounding resistance lightning arrester F4, the first current transformer T1, the second current transformer T2, the fifth current transformer T5 and the connection transformer side voltage transformer PT1 are directly grounded. The invention cancels the switch-on resistance and the starting resistance which are arranged at the network side and the valve side of the connecting transformer in the traditional flexible direct current system, the starting loop is arranged at the network side of the connecting transformer, the starting loop adopts a resistance wiring scheme which comprehensively limits the magnetizing inrush current of the connecting transformer and the impulse current of the converter valve, the design complexity of the main wiring and the design difficulty of the connecting transformer can be effectively reduced, and the resistance loop has simple design, small occupied area, low investment and high reliability.
In a preferred embodiment, the connection transformer TR has a three-winding structure, the grid-side winding of the connection transformer TR has a star shape, and the valve-side winding and the third winding of the connection transformer TR have a triangular shape.
In a preferred embodiment, the energy design of the starting resistor R1 needs to fully consider the influence of the excitation inrush current of the excitation transformer and the charging current of the converter valve, and the actual energy value is generally determined through electromagnetic simulation.
In a preferred embodiment, the first current transformer T1 can effectively monitor the operating state of the starting resistor R1, determine the operating characteristics of the starting resistor through the current characteristics, serve as a basis for protection configuration, and provide effective reference for operators.
Example 2
The embodiment provides a starting method of an offshore flexible-direct main wiring system, which comprises the following steps:
1) Under the normal operation condition that the reliability of components such as the connecting transformer is verified:
1.1 The first and second disconnectors Q21 and Q22 on the grid side of the coupling transformer TR and the third disconnector Q23 on the valve side of the coupling transformer TR are closed, and the marine flexible-direct main wiring system enters a hot standby state.
1.2 The fourth disconnector Q24 on the network side of the coupling transformer TR is closed, which couples the transformer TR with the converter for charging.
1.3 The AC circuit breaker Q1 at the network side of the transformer is closed, and the offshore flexible-direct main wiring system enters a formal operation stage.
2) Under the operational aspect that drops into again after connection transformer TR troubleshooting, because after connection transformer TR troubleshooting, need alone to charge to verify at connection transformer TR, again charge to whole main wiring system after not having the problem and verify, consequently:
2.1 Operational reliability of the coupling transformer TR is verified separately: and (3) disconnecting the third disconnecting switch Q23 on the valve side of the connecting transformer TR, closing the first disconnecting switch Q21 and the second disconnecting switch Q22 on the net side of the connecting transformer TR, and enabling the offshore flexible direct-current main wiring system to enter a hot standby state.
2.2 The fourth disconnector Q24 on the network side of the coupling transformer TR is closed and the coupling transformer TR is charged.
2.3 After the operational reliability of the connection transformer TR is verified, if the main wiring system needs to be started, the connection transformer TR is powered off again, and then the starting process in the step 1) under the normal condition is executed.
The connecting transformer and the converter valve can be started simultaneously under normal conditions, the combined design of a closing resistor and a starting resistor can be realized, the independent starting of the connecting transformer can be realized through the isolating switch arranged in front of the connecting transformer and the converter valve under special conditions, and various operation modes required by an offshore flexible direct current system can be well adapted.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (8)
1. An offshore flexible-direct main wiring system is characterized by comprising a connecting transformer;
the network side winding of the connecting transformer is connected with one end of a first isolating switch through a lightning arrester and one end of a first grounding switch, the other end of the first isolating switch is connected with one end of a second isolating switch through one end of a second grounding switch, one end of a connecting transformer network side alternating current circuit breaker and one end of a third grounding switch in sequence, the other end of the first isolating switch is further connected with one end of the second isolating switch through a starting circuit, and the other end of the second isolating switch is connected with an alternating current power grid through one end of a fourth grounding switch;
the network side winding of the connecting transformer is also connected with a variable network side neutral point arrester and a first current transformer in parallel;
a valve side winding of the connecting transformer is connected with a grounding reactor loop and one end of a connecting variable valve side current transformer in parallel sequentially through one end of a connecting variable valve side lightning arrester, one end of a connecting variable valve side voltage transformer, one end of a fifth grounding switch, one end of a third isolating switch and one end of a sixth grounding switch, the other end of the connecting variable valve side lightning arrester is connected with one end of a second current transformer, and the other end of the connecting variable valve side current transformer is connected with a current converter through a wall bushing;
the other ends of the loops of the first grounding switch, the second grounding switch, the third grounding switch, the fourth grounding switch, the sixth grounding switch, the lightning arrester, the neutral point lightning arrester connected with the transformer side, the first current transformer, the second current transformer, the voltage transformer connected with the transformer side and the grounding reactor are directly grounded;
the starting circuit comprises a starting resistor, a third current transformer, a seventh grounding switch and a fourth isolating switch;
one end of the starting resistor is connected with the first isolating switch and the second grounding switch in parallel, and the other end of the starting resistor is connected with the second isolating switch and the third grounding switch in parallel sequentially through the third current transformer, one end of the seventh grounding switch and the fourth isolating switch;
the grounding reactor loop comprises a grounding loop inductor, a grounding resistor, a fourth current transformer, a fifth current transformer and a grounding resistor arrester;
one end of the grounding loop inductor is connected with the sixth grounding switch in parallel and is connected with the variable valve side current transformer, the other end of the grounding loop inductor is connected with one end of the grounding resistor and one end of the grounding resistor arrester in parallel through the fourth current transformer, the other end of the grounding resistor is connected with one end of the fifth current transformer, and the other ends of the fifth current transformer and the grounding resistor arrester are directly grounded.
2. An offshore flexible-direct main wiring system according to claim 1, wherein said coupling transformer is of a three-winding configuration.
3. An offshore flexible-direct main wiring system according to claim 2, wherein the net side winding of the connection transformer is star-shaped, and the valve side winding and the third winding of the connection transformer are both delta-shaped.
4. An offshore soft-direct main wiring system according to claim 1, wherein the actual energy value of the starting resistor is determined by electromagnetic simulation considering the influence of excitation inrush current of an excitation transformer and charging current of a converter valve.
5. A method for starting an offshore flexible-direct main wiring system is characterized by comprising the following steps:
under the normal operation condition that the operation reliability of the connecting transformer is verified, the offshore flexible-direct-current main wiring system of any one of claims 1 to 4 is put into a hot standby state, and the connecting transformer and the converter are charged;
the AC circuit breaker on the network side of the transformer is connected in a closed mode, and the offshore flexible-direct main wiring system enters a formal operation stage;
in the case of operation of the connection transformer which is put back into operation after troubleshooting, the operational reliability of the connection transformer is verified separately, and the offshore flexible-direct main connection system according to any one of claims 1 to 4 is put into a hot standby state to charge the connection transformer.
6. The method of starting an offshore flexible-direct main wiring system according to claim 5, further comprising:
after the operation reliability of the connection transformer is verified, if the offshore flexible-direct main wiring system needs to be started, the connection transformer is powered off again to execute the starting process under the normal operation condition.
7. The method for starting up an offshore flexible-direct-main wiring system according to claim 5, wherein the method for charging the coupling transformer and the inverter by entering the offshore flexible-direct-main wiring system according to any one of claims 1 to 4 into a hot standby state under normal operation conditions that the coupling transformer has been verified in operation reliability comprises the following steps:
the first isolating switch and the second isolating switch which are connected with the transformer network side and the third isolating switch which is connected with the transformer valve side are closed, and the offshore flexible-direct main wiring system enters a hot standby state;
and closing a starting loop connected with the network side of the transformer, and connecting the transformer with the current converter for charging.
8. The method for starting up an offshore flexible-direct-main wiring system according to claim 5, wherein the step of charging the coupling transformer by putting the offshore flexible-direct-main wiring system according to any one of claims 1 to 4 into a hot standby state comprises the steps of:
disconnecting the third isolating switch connected with the transformer valve side, closing the first isolating switch and the second isolating switch connected with the transformer network side, and enabling the offshore flexible direct-current main wiring system to enter a hot standby state;
and closing a starting loop connected with the network side of the transformer, and connecting the transformer for charging.
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| CN202211306293.7A CN115378021B (en) | 2022-10-25 | 2022-10-25 | Offshore flexible-straight main wiring system and starting method thereof |
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| CN202211306293.7A CN115378021B (en) | 2022-10-25 | 2022-10-25 | Offshore flexible-straight main wiring system and starting method thereof |
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| CN115378021B true CN115378021B (en) | 2023-01-24 |
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| CN106712238B (en) * | 2017-01-16 | 2019-05-07 | 南京南瑞继保电气有限公司 | The charging method of one seed module mixed type inverter |
| CN111478368B (en) * | 2020-05-13 | 2022-12-06 | 南方电网科学研究院有限责任公司 | Connection transformer switching method, system and equipment for hot standby connection transformer circuit |
| CN114204532A (en) * | 2021-10-25 | 2022-03-18 | 北京无线电测量研究所 | Distribution circuit for reducing starting impact current of transformer in radar system |
| CN115021313A (en) * | 2022-06-20 | 2022-09-06 | 国网经济技术研究院有限公司 | Direct-current power transmission system starting circuit and method based on phase-changing and current-converting of hybrid power grid |
| CN115173379A (en) * | 2022-08-17 | 2022-10-11 | 国网经济技术研究院有限公司 | Symmetrical monopole flexible direct current grounding system and grounding parameter selection method thereof |
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