CN107579593B - Energy supply system of high-voltage direct-current circuit breaker - Google Patents
Energy supply system of high-voltage direct-current circuit breaker Download PDFInfo
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- CN107579593B CN107579593B CN201710869040.3A CN201710869040A CN107579593B CN 107579593 B CN107579593 B CN 107579593B CN 201710869040 A CN201710869040 A CN 201710869040A CN 107579593 B CN107579593 B CN 107579593B
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- 239000010410 layer Substances 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000005284 excitation Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 4
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- 238000012544 monitoring process Methods 0.000 description 2
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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Abstract
The invention provides an energy supply system of a high-voltage direct-current circuit breaker, which comprises an alternating-current power supply, a cascaded energy transmission transformer, a cascaded interlayer isolation transformer and a low-voltage load-regulating transformer, wherein the alternating-current power supply, the cascaded energy transmission transformer and the cascaded interlayer isolation transformer are sequentially connected; the primary side or the secondary side of the interlayer isolation transformer is connected with the primary side of the low-voltage load regulating transformer, and the secondary side of the low-voltage load regulating transformer is used for being connected with energy taking equipment of the high-voltage direct-current circuit breaker through an energy transmission cable; the primary side of the energy transmission transformer is connected with a first reactive power compensation device, and a second reactive power compensation device is connected between the secondary side of the interlayer isolation transformer and the low-voltage load-regulating transformer. Through setting up reactive power compensator, the reactive power consumption in the governing system that can be nimble has solved the loss that energy supply transformer itself excitation produced and reactive power consumption's component, has improved energy supply transformer's power factor, has reduced the manufacturing cost and the volume of equipment.
Description
Technical Field
The invention belongs to the technical field of high-voltage direct-current circuit breakers of power systems, and particularly relates to an energy supply system of a high-voltage direct-current circuit breaker.
Background
the hybrid high-voltage direct-current circuit breaker generally comprises a through-current branch consisting of a fast mechanical switch and a main branch electronic switch, a parallel electronic transfer branch and an energy absorption loop. By utilizing the bidirectional fast switching characteristic of the IGBT, the transfer and the consumption of the fault current are completed rapidly. The invention relates to a high-voltage direct-current circuit breaker, which is a hybrid high-voltage direct-current circuit breaker comprising a high-power electronic switch.
The high-voltage direct-current circuit breaker is main equipment for ensuring the safe operation of a direct-current transmission system, and the high-voltage direct-current circuit breaker cannot provide a power supply source by a self-energy-obtaining method because the terminal voltage is very low when the high-voltage direct-current circuit breaker is closed. At present, international general external energy supply technologies comprise two types, one is a photoelectric coupling technology, energy is transmitted to a high potential through laser, and then the high potential is converted into a trigger power supply of an IGBT (insulated gate bipolar translator) in a direct current breaker. One is to provide a trigger power supply for the high potential IGBT through a high voltage isolation power supply. The latter energy supply is currently widely adopted in high voltage direct current circuit breakers, taking into account the manufacturing costs of practical engineering applications. In the power supply of the high-voltage direct-current circuit breaker, the power factor is an important coefficient for measuring the efficiency of the transformer. The power factor is low, and the reactive power for alternating magnetic field conversion is large, so that the utilization rate of equipment is reduced, and the loss and the capacity of the equipment are increased. In the prior design and engineering application of energy supply transformer products, because the voltage grade of the direct current breaker products is low, the capacity of the energy supply transformer is small, the prior product technology and the capacity can be directly used, and a reactive power compensation device is not required to be added; however, as the voltage class of the dc circuit breaker increases, the capacity of the energy-extracting power supply gradually increases, and the manufacturing cost, volume, and floor space of the energy-supplying transformer increase nonlinearly compared to the capacity. The low power factor makes the capacity of energy supply equipment low, bulky, manufacturing cost is high, causes a big difficult problem of high voltage direct current circuit breaker power supply.
Disclosure of Invention
the invention aims to provide an energy supply system of a high-voltage direct-current circuit breaker, which is used for solving the problems of large equipment volume and high manufacturing cost caused by lower power factor of the energy supply system of the high-voltage direct-current circuit breaker in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
An energy supply system of a high-voltage direct-current circuit breaker comprises an alternating-current power supply, a cascaded energy transmission transformer, a cascaded interlayer isolation transformer and a low-voltage load-regulating transformer, wherein the alternating-current power supply, the cascaded energy transmission transformer and the cascaded interlayer isolation transformer are sequentially connected; the primary side or the secondary side of the interlayer isolation transformer is connected with the primary side of the low-voltage load regulating transformer, and the secondary side of the low-voltage load regulating transformer is used for being connected with electric equipment of the high-voltage direct-current circuit breaker through an energy transmission cable; the primary side of the energy transmission transformer is connected with a first reactive power compensation device, and a second reactive power compensation device is connected between the secondary side of the interlayer isolation transformer and the low-voltage load-regulating transformer.
Furthermore, the energy supply system also comprises a UPS power supply, a cascaded energy supply transformer, a cascaded interlayer isolation transformer and a low-voltage load-regulating transformer; the primary side or the secondary side of the interlayer isolation transformer is connected with the primary side of the low-voltage load regulating transformer, the secondary side of the low-voltage load regulating transformer is used for being connected with energy taking equipment of the high-voltage direct-current circuit breaker through an energy transmission cable, and the alternating-current power supply and the UPS are arranged in parallel.
Further, the capacity of the first reactive power compensation device is fixed, and the capacity of the second reactive power compensation device is adjusted according to the capacity of the valve layer load.
Furthermore, a first switch is arranged between the alternating current power supply and the corresponding energy transmission transformer in a series mode, and a second switch is arranged between the UPS power supply and the corresponding energy transmission transformer in a series mode.
Further, under the normal operation condition of the alternating current power supply and the UPS, the corresponding power supply supplies power to the high-voltage direct current circuit breaker by controlling at least one switch of the first switch and the second switch to be closed.
further, a third switch is connected between the output end of the alternating current power supply and the output end of the UPS power supply.
Further, under the condition of an alternating current power failure, the second switch is controlled to be closed, or the first switch and the third switch are controlled to be closed to supply power to the high-voltage direct current breaker.
Further, the power supply voltage of the alternating current power supply and the UPS power supply is 380V.
The invention has the beneficial effects that:
The invention provides an energy supply system of a high-voltage direct-current circuit breaker, which comprises an alternating-current power supply, a cascaded energy transmission transformer, a cascaded interlayer isolation transformer and a low-voltage load-regulating transformer, wherein the alternating-current power supply, the cascaded energy transmission transformer and the cascaded interlayer isolation transformer are sequentially connected; the primary side or the secondary side of the interlayer isolation transformer is connected with the primary side of the low-voltage load regulating transformer, and the secondary side of the low-voltage load regulating transformer is used for being connected with electric equipment of the high-voltage direct-current circuit breaker through an energy transmission cable; the primary side of the energy transmission transformer is connected with a first reactive power compensation device, and the secondary side of the interlayer isolation transformer is connected with a second reactive power compensation device. By adding the reactive power compensation device, the reactive power consumption in the system can be flexibly adjusted, the loss generated by excitation of the energy supply transformer and the component of the reactive power consumption are solved, the power factor of the energy supply transformer is improved, and the manufacturing cost of equipment is reduced.
Furthermore, the power supply device is connected with the power supply device, the power supply device connected with the alternating current power supply is redundant, the power supply device adopting a redundant power supply structure supplies power to the electric equipment of the high-voltage direct current circuit breaker, when one power supply fails, the other redundant power supplies can continue to supply power to the electric equipment of the high-voltage direct current circuit breaker, the power supply reliability is improved, the high-voltage direct current circuit breaker can normally take power, and the high-voltage direct current circuit breaker can normally work.
Drawings
Fig. 1 is a schematic structural diagram of a high-voltage direct-current circuit breaker and an energy supply system;
Fig. 2 is a schematic structural diagram of a high-voltage direct-current circuit breaker and another energy supply system;
Fig. 3 is a block diagram of the connection of the high voltage dc breaker to the power supply.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
An energy supply system of a high-voltage direct-current circuit breaker is shown in figure 1, and comprises an alternating-current power supply, a cascaded energy transmission transformer, a cascaded interlayer isolation transformer and a low-voltage load-regulating transformer which are sequentially connected; the number of the energy transmission transformers in the embodiment is two, and the number of the interlayer isolation transformers is three. In order to ensure the reliability of power taking of the high-voltage direct-current circuit breaker, the power taking power supply system of the high-voltage direct-current circuit breaker of the embodiment further includes a UPS standby power supply as shown in fig. 2, the power supply system shown in fig. 1 and the power supply system shown in fig. 2 are redundant to each other, in fig. 1 and fig. 2, the primary side or the secondary side of the interlayer isolation transformer is connected with the primary side of the low-voltage load-regulating transformer, and the secondary side of the low-voltage load-regulating transformer is used for being connected with the power taking equipment; the primary side of the energy transmission transformer is connected with a first reactive power compensation device, and a second reactive power compensation device is connected between the secondary side of each layer of the isolated transformer and the low-voltage load-regulating transformer. Wherein the capacity of the first reactive compensation device is fixed, and the capacity of the second reactive compensation device is adjusted according to the capacity of the valve layer load.
The capacity of a conventionally used energy delivery system of the high-voltage direct-current circuit breaker is not large, the rated delivery current is dozens to hundreds of amperes, and the rated delivery power is dozens to hundreds of kilowatts; however, since the energy supply system and the energy supply equipment of the hvdc breaker are non-pure resistance circuits, energy exchange and loss exist between the capacitive load and the inductive load in the circuit, which causes problems such as large apparent reactive power of the energy transmission transformer, low power factor, heat generation of the equipment, low utilization rate of the equipment, and increased manufacturing cost and expense for solving the problems. The invention flexibly adjusts the reactive power consumption caused by the additional reactive power compensation at two specific positions, respectively solves the components of the loss and the reactive power consumption generated by the excitation of the energy transmission transformer and flexibly compensates the reactive power of the energy supply system due to different external loads.
Therefore, the reactive power compensation device WP X1 and WP X2 are respectively arranged on the primary side of the power supply transformer and the secondary side of the interlayer isolation transformer, wherein X represents a main system and a standby system which are redundant with each other, WP X1 is reactive power compensation equipment with fixed capacity, the capacity of the reactive power compensation equipment is determined by parameters such as manufacturing capacity and short-circuit impedance of the power supply transformer, in addition, a plurality of groups of taps can be designed for the adjustable reactive power compensation device WP X2 designed for different valve layer loads, the reactive power compensation device WP X2 can meet reactive power compensation requirements of various load matching, as shown in figure 2, when X is equal to 1, the adjustable reactive power compensation device WP 354635 and the fixed reactive power compensation device WP 38723 are connected to the primary side of the power supply transformer of one set of power supply devices, the adjustable reactive power compensation device WP12 is connected to the secondary side of the interlayer isolation transformer of the set of power supply devices, when X is equal to 2, the adjustable reactive power compensation device WP21 and the adjustable reactive power compensation device WP22 are included, the fixed reactive power compensation device WP21 is connected to the reactive power supply transformer of the primary side of the other set of the reactive power supply transformer, and.
specifically, the energy-obtaining power supply system of the high-voltage direct-current circuit breaker of the embodiment includes an Uninterruptible Power Supply (UPS) and an alternating-current power supply (AC1) which are led out from the same alternating-current system (providing the synchronization signal), wherein the alternating-current power supply (AC1) is an active system, and the UPS is a passive system. After the UPS power supply completes the charging process in the first use, the charged power supply performs daily operation; after the active system is powered off, the UPS is automatically switched to the UPS power supply to provide all power support, and meanwhile, the monitoring system of the UPS reports the power-off fault of the AC power supply to the master control of the energy supply system. The power supply voltage of the alternating current power supply and the UPS power supply is 380V; as shown in fig. 3, a first switch is connected in series between the ac power source and the corresponding energy transmission transformer, and a second switch is connected in series between the UPS power source and the corresponding energy transmission transformer; and a third switch is connected between the output end of the alternating current power supply and the output end of the UPS power supply.
The power output by the AC power source AC1 and the UPS power source passes through the first transformer, i.e., the energy delivery transformer in fig. 1 and 2, to convert the low voltage AC power to high voltage AC power for powering the high voltage dc circuit breaker.
A first switch K1 is connected between the alternating current power supply AC1 and the fixed reactive power compensation device WP11, a second switch K2 is connected between the UPS and the fixed reactive power compensation device WP21, and the output end of the alternating current power supply AC1 is connected with the output end of the UPS through a third switch K3. The invention relates to an operation mode and a control strategy between a redundant power supply and an energy transmission transformer which are mutually standby, as shown in the attached figure 3: the first condition is a normal operation condition, and when the alternating current power supply and the UPS power supply are in the normal operation condition, at least one switch of the first switch and the second switch is controlled to be closed, and the corresponding power supply supplies power for the high-voltage direct-current circuit breaker. The system comprises three normal operation modes, and can be flexibly selected according to the power capacity required by the load; firstly, the normal operation condition 1: k1 is closed, K2 and K3 are opened; the AC1 AC low-voltage power supply provides 100% energy transmission capacity required by the high-voltage DC breaker for the normal operation of the high-voltage DC breaker, and the UPS power supply is in a hot standby state; secondly, normal operation condition 2: k1, K2 are closed, and K3 is open; the AC1 alternating current power supply and the UPS power supply are in normal operation states at the same time, the AC1 alternating current power supply provides an operation state monitoring function of equipment for the high-voltage direct current breaker, the UPS power supply is in a driven monitored state, and the AC1 alternating current power supply and the UPS power supply respectively provide 50% of energy transmission capacity for loads; the switches K2 and K3 can be closed, K1 is opened, and 100% of energy transmission capacity required by the high-voltage direct-current circuit breaker is provided for normal operation of the high-voltage direct-current circuit breaker by an AC1 alternating-current low-voltage power supply.
And the second condition is that when the active system fails, the second switch is controlled to be closed or the third switch and the first switch are controlled to be closed to supply power to the high-voltage direct-current circuit breaker under the condition of alternating-current power failure. Namely, the switches K1 and K3 are closed, the switch K2 is opened, the AC1 is switched to the UPS power supply to provide 100% energy transmission capacity for the high-voltage direct-current circuit breaker, or the switch K2 is closed, the switches K1 and K3 are switched from the AC1 to the UPS power supply to provide 100% energy transmission capacity for the high-voltage direct-current circuit breaker, and when two working conditions of normal operation have faults, the active system AC1 can be switched to the UPS power supply.
The energy supply system of the high-voltage direct-current circuit breaker has the following technical advantages and use values:
1) A brand-new alternating current power supply and a UPS power supply are adopted as a low-voltage power supply of a redundant energy supply system of the high-voltage direct-current circuit breaker and are mutually redundant and standby, the UPS power supply can play a role in stabilizing alternating current voltage, and the problems of local heating and electromagnetic loss caused by parasitic coupling interference between redundant windings due to disturbance of power supply voltage and frequency are solved.
2) Through the two sets of reactive power compensation devices of the primary side and the secondary side of the energy supply transformer of the energy supply system, the reactive power compensation brought to the running and the access load of the energy supply system is realized through the fixed capacity and the flexible adjusting mode, the power factor of energy supply equipment is improved, the capacity of the equipment is reduced, and the manufacturing cost is saved.
3) The control strategy of the main and standby systems is adopted for the redundant energy transmission system of the high-voltage direct-current circuit breaker, the standby function of the redundant equipment is fully exerted, the fault of the energy supply power supply system is judged according to the switching information of the main and standby systems, and the operation reliability of the energy transmission system of the high-voltage direct-current circuit breaker is improved.
4) The design and control strategy of the redundant energy transmission system of the high-voltage direct-current circuit breaker for the mutual standby power supply and the design method of the flexible and adjustable reactive compensation equipment enable the redundant energy transmission system to have the advantages of wide application range and high application value in the field of energy supply of high-power high-voltage electronic equipment such as the high-voltage direct-current circuit breaker.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (8)
1. an energy supply system of a high-voltage direct-current circuit breaker comprises an alternating-current power supply, a cascaded energy transmission transformer, a cascaded interlayer isolation transformer and a low-voltage load-regulating transformer, wherein the alternating-current power supply, the cascaded energy transmission transformer and the cascaded interlayer isolation transformer are sequentially connected; the primary side or the secondary side of the interlayer isolation transformer is connected with the primary side of the low-voltage load regulating transformer, and the secondary side of the low-voltage load regulating transformer is used for being connected with electric equipment of the high-voltage direct-current circuit breaker through an energy transmission cable; the system is characterized in that a first reactive power compensation device is connected to the primary side of the energy transmission transformer, and a second reactive power compensation device is connected between the secondary side of the interlayer isolation transformer and the low-voltage load-regulating transformer.
2. The energy supply system of the high-voltage direct current circuit breaker according to claim 1, characterized in that the energy supply system further comprises a UPS power supply, a cascaded energy supply transformer and a cascaded interlayer isolation transformer, and further comprises a low-voltage load-regulating transformer; the primary side or the secondary side of the interlayer isolation transformer is connected with the primary side of the low-voltage load regulating transformer, the secondary side of the low-voltage load regulating transformer is used for being connected with energy taking equipment of the high-voltage direct-current circuit breaker through an energy transmission cable, and the alternating-current power supply and the UPS are arranged in parallel.
3. The energy supply system of a high voltage direct current circuit breaker according to claim 1, characterized in that the capacity of the first reactive compensation device is fixed and the capacity of the second reactive compensation device is adjusted according to the capacity of the valve layer load.
4. The system of claim 2, wherein a first switch is connected in series between the ac power source and the corresponding energy transmission transformer, and a second switch is connected in series between the UPS power source and the corresponding energy transmission transformer.
5. The energy supply system of the HVDC breaker of claim 4, wherein the HVDC breaker is powered by the corresponding power supply by controlling at least one of the first switch and the second switch to be closed under normal operation of the AC power supply and the UPS.
6. The system of claim 5, further comprising a third switch coupled between the output of the AC power source and the output of the UPS power source.
7. Energy supply system for a high voltage direct current circuit breaker according to claim 6, characterized in that in case of a fault condition of the alternating current power supply the second switch is controlled to close, or both the first switch and the third switch are controlled to close, for supplying the high voltage direct current circuit breaker.
8. The system of claim 2, wherein the ac power source and the UPS power source have a supply voltage of 380V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710869040.3A CN107579593B (en) | 2017-09-22 | 2017-09-22 | Energy supply system of high-voltage direct-current circuit breaker |
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| CN201710869040.3A CN107579593B (en) | 2017-09-22 | 2017-09-22 | Energy supply system of high-voltage direct-current circuit breaker |
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| CN107579593B true CN107579593B (en) | 2019-12-10 |
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| CN108321759A (en) * | 2018-02-13 | 2018-07-24 | 全球能源互联网研究院有限公司 | Dc circuit breaker energy supplying system |
| CN109215996A (en) * | 2018-09-19 | 2019-01-15 | 常州博瑞电力自动化设备有限公司 | A kind of energy supply transformer of isolation over the ground |
| CN111509757B (en) * | 2020-04-03 | 2021-10-08 | 清华大学 | Isolated energy supply device and method for fully-controlled switch device |
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| CN105811569B (en) * | 2014-12-29 | 2019-07-12 | 国家电网公司 | A kind of hybrid energy supplying system of high voltage DC breaker |
| JP2016213123A (en) * | 2015-05-12 | 2016-12-15 | 株式会社東芝 | Tester of dc circuit breaker and test method thereof |
| CN106487043A (en) * | 2015-08-26 | 2017-03-08 | 国网智能电网研究院 | A kind of hybrid integrated high-level energy supplying system for high voltage DC breaker |
| CN205960975U (en) * | 2016-08-24 | 2017-02-15 | 北京华宇航锋电力技术有限公司 | High voltage direct current circuit breaker power supply system |
| CN206117315U (en) * | 2016-08-31 | 2017-04-19 | 许继电气股份有限公司 | Direct current breaker and be used for supply circuit of direct current breaker power module |
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