CN112994223A - Configuration method of direct-current power supply system of transformer substation - Google Patents
Configuration method of direct-current power supply system of transformer substation Download PDFInfo
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- CN112994223A CN112994223A CN202110228852.6A CN202110228852A CN112994223A CN 112994223 A CN112994223 A CN 112994223A CN 202110228852 A CN202110228852 A CN 202110228852A CN 112994223 A CN112994223 A CN 112994223A
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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
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
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Abstract
The invention discloses a method for configuring a direct-current power supply system of a transformer substation, which comprises the following steps: determining the number of configured direct current power supply systems according to the voltage grade of the transformer substation; determining the capacity of a storage battery pack of a direct-current power supply system according to the load size and the discharge duration of the direct-current power supply and various discharge capacities within the accident time, so that the storage battery pack can meet the discharge requirement of not less than 10h under the alternating-current power failure; determining the number of the single batteries according to the charging voltage, the float charging voltage of the single batteries of the storage battery pack and the total float charging voltage of the storage battery pack; the total current of the charging modules is more than or equal to the sum of the frequent load current in the station and the capacity of the storage battery pack, which can meet the condition that the discharge is not less than 10h, and the number of the charging modules is determined according to the total current of the charging modules and the rated output current of the charging modules; the total current of the power supply modules is larger than or equal to the frequent load current in the station, and the number of the power supply modules is determined according to the total current of the power supply modules and the rated output current of the power supply modules.
Description
Technical Field
The invention relates to the technical field of direct-current power supplies of transformer substations, in particular to a configuration method of a direct-current power supply system of a transformer substation.
Background
The direct current power supply is important power equipment of a transformer substation, and is an important power supply of devices for control, protection, signal indication, automation, emergency lighting and the like of the transformer substation. In the era of large-scale popularization of electric power at present, safe and reliable operation of a transformer substation is an important guarantee for guaranteeing economic normal operation.
The direct-current power supply system in the existing transformer substation is designed on the basis of the standard electric power parameters specified by the state, the universality and the direct-current power supply reliability are poor, and the management cost and the hardware use cost are improved.
Therefore, how to correctly and reasonably design the direct-current power supply system of the transformer substation directly relates to the stable operation of the power grid system and the power supply safety of the equipment.
Disclosure of Invention
The invention aims to provide a configuration method of a transformer substation direct-current power supply system, which meets technical standards, meets technical requirements for on-site safe operation, is simple to operate, and solves the problems of unstable operation and frequent failure of the direct-current power supply system caused by multiple reasons of unreasonable and unmatched design and model selection of the conventional transformer substation direct-current power supply system, insufficient capacity and the like.
In order to solve the technical problem, an embodiment of the present invention provides a method for configuring a dc power supply system of a substation, including:
s1, determining the number of configured direct current power supply systems according to the voltage grade of the transformer substation;
s2, determining the capacity of the storage battery pack of the direct-current power supply system according to the load size and the discharge duration of the direct-current power supply and various discharge capacities within the accident time, so that the storage battery pack can meet the discharge requirement of not less than 10h under the alternating-current power failure;
s3, determining the number of the single batteries according to the charging voltage, the float charging voltage of the single batteries of the storage battery pack and the total float charging voltage of the storage battery pack;
s4, the total current of the charging modules is more than or equal to the sum of the current when the constant load current in the station and the capacity of the storage battery pack can meet the condition that the discharge is not less than 10h, and the number of the charging modules of the direct-current power supply system is determined according to the total current of the charging modules and the rated output current of the charging modules;
and S5, determining the number of the power supply modules of the direct current power supply system according to the total current of the power supply modules and the rated output current of the power supply modules, wherein the total current of the power supply modules is larger than or equal to the frequent load current in the station.
Wherein the S1 includes:
judging whether the voltage grade of the transformer substation is greater than or equal to 110 kV;
if so, the number of the configured direct current power supply systems is 2, otherwise, the number of the configured direct current power supply systems is 1.
Wherein the S4 further includes:
the number of the charging modules is configured by adopting N +1 redundancy, wherein N is a minimum integer larger than the ratio of the total current of the charging modules to the rated output current of the charging modules.
Wherein the S5 includes:
the number of the power supply modules is configured by adopting M +1 redundancy, wherein M is a minimum integer larger than the ratio of the total current of the power supply modules to the rated output current of the power supply modules.
Wherein the S5 further includes:
and configuring a monitoring device for the charging module and the power supply module to monitor the alternating voltage, and sending an alarm signal and an action signal to disconnect the alternating current input to the charging module and the power supply module after the alternating voltage exceeds a threshold range.
Wherein said S5 thereafter comprises:
the charging module and the power supply module are provided with a direct-current high-frequency switching power supply module, and the alternating-current power supply voltage working range of the direct-current high-frequency switching power supply module is 85% -120% of rated voltage
The capacity and specification model, manufacturer brand, voltage parameter and current parameter of the single battery configured by the storage battery pack are the same, the ratio of the average charging voltage to the floating charging voltage of the storage battery pack is 1.03-1.05, and 108 single batteries with the floating charging voltage of 2.25V or 18 single batteries with the floating charging voltage of 13.5V are configured by the storage battery pack.
The direct current interconnection isolating switch is arranged between the control nuts and the combination nuts of the direct current feed screens of the 2 sets of direct current power supply systems.
The direct current power supply system further comprises a silicon chain voltage reduction device arranged between the closing bus and the control bus of the direct current power supply system.
Compared with the prior art, the configuration method of the transformer substation direct-current power supply system provided by the embodiment of the invention has the following advantages:
the method for configuring the direct-current power supply system of the transformer substation determines the number of the direct-current power supply systems to be configured by determining the voltage grade of the transformer substation; determining the capacity of a storage battery pack of the direct-current power supply system according to the load size and the discharge duration of the direct-current power supply and various discharge capacities within the accident time, so that the storage battery pack can meet the discharge requirement of not less than 10h under the alternating-current power failure; determining the number of the single batteries according to the charging voltage, the float charging voltage of the single batteries of the storage battery pack and the total float charging voltage of the storage battery pack; the total current of the charging modules is more than or equal to the sum of the current of the frequent load current in the station and the capacity of the storage battery pack when the discharge is not less than 10h, and the number of the charging modules of the direct-current power supply system is determined according to the total current of the charging modules and the rated output current of the charging modules; the total current of the power supply modules is larger than or equal to the frequent load current in the station, and the number of the power supply modules of the direct-current power supply system is determined according to the total current of the power supply modules and the rated output current of the power supply modules. The matching degree of the configured direct-current power supply system and a direct-current power supply required by the transformer substation is high, the direct-current power supply reliability is high, the condition of insufficient capacity does not exist, the problem of high hardware use cost caused by performance such as overhigh capacity does not exist, a standard configuration flow is provided for the configuration of the direct-current power supply system of the transformer substation, the configuration difficulty of designers is reduced, and the occurrence frequency of direct-current power supply faults is reduced.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic step flow diagram of a method for configuring a dc power supply system of a substation according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, fig. 1 is a schematic step flow diagram of a method for configuring a dc power supply system of a substation according to an embodiment of the present invention.
In a specific embodiment, the method for configuring the dc power supply system of the substation includes:
s1, determining the number of configured direct current power supply systems according to the voltage grade of the transformer substation;
s2, determining the capacity of the storage battery pack of the direct-current power supply system according to the load size and the discharge duration of the direct-current power supply and various discharge capacities within the accident time, so that the storage battery pack can meet the discharge requirement of not less than 10h under the alternating-current power failure;
s3, determining the number of the single batteries according to the charging voltage, the float charging voltage of the single batteries of the storage battery pack and the total float charging voltage of the storage battery pack;
s4, the total current of the charging modules is more than or equal to the sum of the current when the constant load current in the station and the capacity of the storage battery pack can meet the condition that the discharge is not less than 10h, and the number of the charging modules of the direct-current power supply system is determined according to the total current of the charging modules and the rated output current of the charging modules;
and S5, determining the number of the power supply modules of the direct current power supply system according to the total current of the power supply modules and the rated output current of the power supply modules, wherein the total current of the power supply modules is larger than or equal to the frequent load current in the station.
Determining the number of direct current power supply systems needing to be configured by determining the voltage grade of a transformer substation; determining the capacity of a storage battery pack of the direct-current power supply system according to the load size and the discharge duration of the direct-current power supply and various discharge capacities within the accident time, so that the storage battery pack can meet the discharge requirement of not less than 10h under the alternating-current power failure; determining the number of the single batteries according to the charging voltage, the float charging voltage of the single batteries of the storage battery pack and the total float charging voltage of the storage battery pack; and finally, determining the power supply mode, the power supply modules, the charging modules and the number of the charging devices to be configured, so that the matching degree of the configured direct-current power supply system and the direct-current power supply required by the transformer substation is high, the condition of insufficient capacity does not exist, and the problem of high hardware use cost caused by performance such as overhigh capacity and the like does not exist, a standard configuration flow is provided for the configuration of the direct-current power supply system of the transformer substation, the configuration difficulty of designers is reduced, and the occurrence frequency of direct-current power supply faults is reduced.
The present invention does not limit the number of the dc power systems configured and ranked in the substation, and in one embodiment, the S1 includes:
judging whether the voltage grade of the transformer substation is greater than or equal to 110 kV;
if so, the number of the configured direct current power supply systems is 2, otherwise, the number of the configured direct current power supply systems is 1.
In the invention, the number of the direct current power supply systems is configured according to the voltage class of the transformer substation, and the complexity and the importance of the transformer substation based on different voltage classes are different, for example, the complexity, importance and reliability of the 110kV transformer substation and the 35kV and below transformer substations are not all the same, it is thus necessary to provide 2 dc power supply systems for a 110kV substation, ensuring its operational reliability, whereas for substations with voltage classes of 35kV and below, the operating voltage level is low, the direct-current power supply system is relatively simple, the requirements on the importance of a transformer substation and the direct-current power supply reliability are relatively low, the requirements can be met by adopting one set of direct-current power supply system, and although 2 sets of configuration can improve the operating reliability, the cost of used hardware is relatively high, so that the operation is not reasonable.
The invention does not limit the level of the transformer substation and the number of the configured direct current power supply systems, and the invention includes but is not limited to configuring 2 sets of direct current power supply systems after the voltage level of the transformer substation is more than or equal to 110kV, and can also configure more sets of direct current power supply systems and is also not limited to 110kV, and in some places, such as 35kV transformer substations for supplying power to business districts or important departments, because the power supply objects are more complicated and the importance is higher, 2 sets of direct current power supply systems can also be configured, and the invention does not limit the situation.
In this application, the number of the charging modules and the number of the power supply modules are not limited, and in order to ensure the operational reliability of the dc power supply system, since the dc power supply system may operate in a high-frequency state, a certain redundancy is required as a backup, in an embodiment, the S4 further includes:
the number of the charging modules is configured by adopting N +1 redundancy, wherein N is a minimum integer larger than the ratio of the total current of the charging modules to the rated output current of the charging modules.
Similarly, the S5 includes:
the number of the power supply modules is configured by adopting M +1 redundancy, wherein M is a minimum integer larger than the ratio of the total current of the power supply modules to the rated output current of the power supply modules.
Example 1:
in a certain 35kV substation, a regular load 5A (the capacity of the selected storage battery pack is 100Ah) is provided, and when a rectifier module is selected, the calculation can be performed as follows: 5A +100Ah/10h 15A. Since 15(a) <20(a) ═ 2 × 10(a), that is, the output current to be output of all the charging modules is 15A by design, 2 charging modules having a rated output current of 10A may be selected.
For a high-frequency switching power supply, it is necessary to consider that the normal operation of the whole group of charging devices is not affected by the fault of an in-operation module, and a mode of N +1 module redundancy arrangement is generally adopted. Therefore, the charging module finally determines the charging module selected as 3 blocks, i.e., 3 blocks 10A.
The frequent load in the station is 5A, 1 power supply module with rated output current of 10A is selected to meet the requirement, and the mode of M +1 module redundancy arrangement is also adopted, so that two power supply modules are selected to be 10A.
Example 2:
in a 110kV substation, a regular load 12A (the capacity of the selected storage battery pack is 200Ah) in the substation is selected, and the calculation can be performed as follows: 12A +200Ah/10 h-32 (A). Since 32(a) <40(a) ═ 2 × 20(a), it is sufficient to select 2 charging modules with a rated output current of 20A. Plus a redundancy, the 3 block 10A charging module is finally selected.
20(A) > 12(A), 1 power supply module with rated output current of 20A is selected to meet the requirement, and a redundancy is added, so that 2 power supply modules with 20A are finally selected.
No matter the module that charges, still power module all adopts a plurality of intelligent high frequency switch power supply modules to connect in parallel, and N +1 hot backup work. The system is operated with load at ordinary times, the load is evenly distributed, and when one module is damaged due to faults, the rest of the modules bear the total load averagely. And each module is provided with a circuit breaker for supplying power independently.
In order to further improve the safety and reliability of the charging module and the power supply module during use, the S4 further includes:
and configuring a monitoring device for the charging module and the power supply module to monitor the alternating voltage, and sending an alarm signal and an action signal to disconnect the alternating current input to the charging module and the power supply module after the alternating voltage exceeds a threshold range.
By configuring the monitoring device, the direct-current power supply system can monitor the alternating-current power supply voltage of the charging module and the power supply module on line in use, alarm can be given and alternating-current input can be cut off once the alternating-current power supply voltage exceeds the range, damage to the charging module and the power supply module and even fault of the direct-current power supply system can be avoided, and the working reliability of the whole direct-current power supply system is improved.
The structure of the charging module and the power supply module monitoring device and the threshold value for alternating current monitoring of the charging module and the power supply module are not limited. In the present application, all of the charging modules and the power supply modules are monitored, not just one of them.
In one embodiment, the ac voltage alarm value of the power module may be set to a lower limit 323V and an upper limit 456V. When the AC input exceeds the set range, the monitoring device sends out an action signal and can disconnect the AC input.
To further improve the reliability of the dc power system, in an embodiment, the step S5 includes:
and the working range of the alternating current power supply voltage of the direct current high-frequency switch power supply module is 85-120% of rated voltage.
Through the direct-current high-frequency switching power supply module configured for the direct-current power supply system, the working range of the alternating-current power supply voltage of the direct-current high-frequency switching power supply module is 85% -120% of rated voltage, so that the direct-current power supply system has high reliability in working, the wide working voltage is adopted, when the input rated voltage is changed within the range of-15% -20%, the direct-current high-frequency switching power supply module can still work normally, and after the input rated voltage exceeds the range, the monitoring device can send an action signal and can disconnect the alternating-current input.
The direct current load in the invention is the recurrent direct current load of the transformer substation, such as a main transformer of each voltage class and a microcomputer protection measurement and control device of each inlet and outlet line, a switch state indicator, a voltage parallel switching device, a telecontrol switch, a position and signal indicator lamp, a small electric grounding wire selection device, a spring energy storage operation device, an energy storage motor, a secondary line, an Uninterruptible Power Supply (UPS) and the like; the system also comprises an accident load of the transformer substation, namely a direct-current lighting load provided by the storage battery pack and the current of a tripping loop of the breaker when the low-voltage alternating current is lost.
The specific configuration of the storage battery pack is not limited, and for the working reliability of the storage battery, the capacity, specification and model, manufacturer brand, voltage parameter and current parameter of the single battery configured by the storage battery pack are the same, so that the power supply parameters of different single batteries are the same, and the service lives of the different single batteries are the same. The invention does not limit the type specification, charging voltage and the like of the single battery.
The invention does not limit the operation parameters and the charging parameters of the storage battery, the ratio of the average charging voltage to the floating charging voltage of the storage battery pack is 1.03-1.05, and the storage battery pack is provided with 108 single batteries with the floating charging voltage of 2.25V or 18 single batteries with the floating charging voltage of 13.5V.
Generally, the float charge voltage of the single battery is 2.25V, 108 single batteries are configured in the storage battery pack, or the float charge voltage of the single battery is 13.5V, 18 single batteries are configured in the storage battery pack, and the ratio of the average charge voltage to the float charge voltage of the storage battery pack is 1.03-1.05.
Namely, the battery configured: selecting a single battery with the float voltage of 2.25V and needing to be provided with 108 storage batteries, namely setting the float voltage to be 234V and setting the uniform charge voltage to be 244V; the floating charge voltage of the single battery is selected to be 13.5V, and 18 storage batteries are required to be configured, namely, the floating charge voltage is set to be 234V, and the uniform charge voltage is set to be 243V. The ratio of the average charge voltage setting to the float voltage setting is typically about 1.04.
If a plurality of sets of direct current power supply systems are configured, the capacity, specification and model, manufacturer brand, voltage parameter and current parameter of the storage batteries of the plurality of sets of direct current power supply systems are the same.
In one embodiment, the capacities, specification models, manufacturer brands and the like of 2 groups of selected storage batteries are configured to be consistent, and the settings of various parameters such as voltage, current and the like are consistent. The capacities and specification models of the 2 groups of storage batteries are required to be consistent (for example, the voltage of each battery is 12V, and the battery capacity is 100Ah), other products such as a rectifier module and the like are preferably made of products of the same brand and the same model of the same manufacturer (the replacement of spare parts is convenient in case of failure), and the settings of various parameters such as voltage, current and the like are as consistent as possible.
In order to ensure the reliable operation and connection of the direct current power supply system, before one set of direct current power supply system breaks down and quits the operation, the short-time parallel operation can be realized through the direct current communication isolating switch between the control bus and the control bus or between the closing bus and the closing bus of 2 sets of direct current power supply systems, and then the broken direct current power supply is cut off so as to meet the requirement of uninterrupted power supply when two buses are switched.
When the two are operated in parallel for a short time, the difference between the direct current voltage values is generally not more than 5 percent of rated voltage. If the voltages of the battery packs are not equal, the battery pack with low voltage becomes a load of the battery pack with high voltage, and large circulation current is generated between the two battery packs, so that the batteries are heated, the power supply amount is reduced, and the service life of the batteries is shortened. The battery packs with different specifications and models and unmatched capacities are connected in parallel for use, so that the batteries are easily damaged. Thus, the reliability of the dc system can be improved in this manner.
The type of the storage battery is not limited in the invention, and in one embodiment, the storage battery is a valve-regulated sealed lead-acid maintenance-free storage battery.
In the invention, as the number of the direct current power supply systems arranged in the transformer substation can be one or more, 2 or more direct current power supply systems are arranged in the transformer substation, the 2 direct current power supply systems are mutually independent in normal operation and respectively carry a part of load, when one direct current power supply system breaks down and is forced to quit the operation, the other direct current power supply system can complete power supply, and the two direct current power supply systems are required to be communicated with each other, and the communication mode is not limited by the invention.
In one embodiment, the configuration method of the substation direct-current power supply system further comprises direct-current interconnection isolating switches arranged between control buses and between combined buses of a direct-current feed screen of the direct-current power supply system.
And establishing the electrical connection among the direct-current power supply systems through a low-voltage cable line by adopting direct-current connection isolating switches which are arranged between a control bus and a control bus of the direct-current feed screen of the 2 sets of direct-current power supply systems and between a combination bus and a combination bus.
The low-voltage cable line is not limited in the invention, and the model of the low-voltage cable line is ZR-VV-5002 x 25mm2(ii) a The + HM, + KM, -KM/-HM of one set of direct current feed screen can also pass through 25mm respectively2The single-core low-voltage cable line is connected to a three-phase isolating switch and then passes through ZR-VV-5003 x 25mm2The low voltage cable of (2) is directly connected to the + HM, + KM, -KM/-HM dc bus bar of another set of dc feed screens, thereby establishing electrical communication between the 2 sets of dc power systems.
The circuit breaker of early transformer substation adopts electromagnetic operating mechanism more, and circuit breaker closing current is great, for example, some inlet wire circuit breakers closing current is up to two hundred and more amperes for when the circuit breaker is closed a floodgate, can cause closing voltage to reduce in the twinkling of an eye, cause voltage variation range great.
Therefore, in order to meet the requirement of reliable power supply to the dc bus voltage when designing the configuration, in one embodiment, the method for configuring the dc power supply system of the substation further includes a silicon link voltage reducing device disposed between the closing bus and the control bus of the dc power supply system.
The grouping control switching of the silicon chain voltage reduction device can be realized through a manual mode or an automatic mode, the silicon chain voltage reduction device can normally operate in an automatic state, the safety requirements of a closing bus and the voltage of a control bus can be met, wiring and arrangement are relatively complex, fault points can be increased, and the reliability of power supply of a direct current system is influenced.
At present, most of circuit breakers of transformer substations adopt spring energy storage operating mechanisms, and switching-on and switching-off currents are small and generally 1-2A.
In order to further reduce the cost and also reduce the failure rate, in an embodiment, the configuration method of the substation dc power supply system may further directly combine the closing bus and the control bus into one without providing a silicon chain voltage reducing device between the closing bus and the control bus of the dc power supply system.
The charging device corresponding to the power supply module is not particularly limited, the microcomputer monitoring module adopts large-screen liquid crystal Chinese character display, can intelligently select/freely select a charging mode, has an acousto-optic alarm function, monitors the alternating current incoming line and the direct current feeder line breaker, can monitor the self condition, provides corresponding fault information, and intelligently manages the whole system. And a communication interface RS485 is configured and can communicate with an upper computer. The parameters of each storage battery are detected and can be displayed in the background of the microcomputer.
The 2-path low-voltage alternating current power supply is respectively connected with 2 sections of alternating current buses of the transformer or low-voltage switch cabinet for the 2 stations. The high-voltage power supply of the upper-stage 2-section bus for supplying power to the high-voltage power supply can be of the same voltage class or different voltage classes. One path of low-voltage alternating current power supply is a main power supply, and the other path of low-voltage alternating current power supply is a hot standby power supply.
When 2 low-voltage incoming lines of the low-voltage alternating-current screen meet the conditions of voltage paralleling and automatic switching operation, if the main power supply fails due to power loss, the standby power supply can be automatically put into operation, and the uninterrupted power supply of important loads is ensured. Under the condition, one path of alternating current inlet wire is connected to the direct current power supply screen, and the charging modules and the power supply modules are supplied with power through alternating current distribution. When the alternating current is cut off, all the electric loads are supplied with power by the storage battery pack.
The charging module converts three-phase alternating current into controllable direct current which accords with the charging characteristic of the storage battery, one path of the controllable direct current supplies intelligent charging and floating charging to the storage battery pack, and the other path of the controllable direct current supplies power to a closing load; the power supply module converts the three-phase alternating current into standard 220V direct current, and supplies power to the frequent control load through the control feeder circuit breaker.
The rated output current of a charging (supply) module of a charging screen of the transformer substation direct current with 220V direct current is usually 5A, 10A, 20A, 30A and the like.
Among them, 10A and 20A are common in the routine model selection.
In the invention, no matter the charging module or the power supply module is adopted, a plurality of intelligent high-frequency switch power supply modules are connected in parallel, and N +1 hot backup work is carried out. The system is operated with load and the load is distributed evenly at ordinary times, when one module is damaged due to failure, the module can be quitted from operation, and the rest modules bear the total load evenly. And each module is provided with a circuit breaker for supplying power independently.
A direct-current power supply monitoring system is designed on the direct-current charging screen, and the main running state of the direct-current system can be inquired in real time through the system. The system has the functions of multi-path alternating current and direct current voltage detection, intelligent charging management, battery voltage inspection, battery internal resistance monitoring, insulation monitoring, background communication, fault recording and the like.
The design configuration of the direct current feed screen of the invention is as follows: according to the conditions of the size of the scale of the transformer substation, the voltage grade, the number of main transformers, the number of bus sections and the like, configuring a direct current control and closing feed circuit meeting the number requirement.
And each feeder circuit of the direct current feed screen is provided with a closing indicator lamp. The feeder circuit breakers are all provided with alarm contacts and send alarm signals to the monitoring unit. The digital direct-current insulation on-line monitoring device is adopted to realize the functions of direct-current bus voltage monitoring and direct-current system grounding and line selection.
If a certain 110kV transformer substation and 4 main transformers are adopted, and both 110kV and 35kV are in a double-bus double-section power supply operation mode, the configuration of a direct current feed-out line is relatively more, and if 18 paths of control buses and 10 paths of combination buses can be selected as required.
A digital direct-current insulation on-line monitoring device is designed on the direct-current feed screen to realize the functions of direct-current bus voltage monitoring and direct-current system grounding line selection.
In summary, in the method for configuring a dc power supply system of a substation provided in the embodiment of the present invention, the number of dc power supply systems to be configured is determined by determining the voltage level of the substation; determining the capacity of a storage battery pack of the direct-current power supply system according to the load size and the discharge duration of the direct-current power supply and various discharge capacities within the accident time, so that the storage battery pack can meet the discharge requirement of not less than 10h under the alternating-current power failure; determining the number of the single batteries according to the charging voltage, the float charging voltage of the single batteries of the storage battery pack and the total float charging voltage of the storage battery pack; and finally, determining the power supply mode, the power supply modules, the charging modules and the number of the charging devices to be configured, so that the matching degree of the configured direct-current power supply system and the direct-current power supply required by the transformer substation is high, the condition of insufficient capacity does not exist, and the problem of high hardware use cost caused by performance such as overhigh capacity and the like does not exist, a standard configuration flow is provided for the configuration of the direct-current power supply system of the transformer substation, the configuration difficulty of designers is reduced, and the occurrence frequency of direct-current power supply faults is reduced.
The configuration method of the substation direct-current power supply system provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A configuration method of a direct current power supply system of a transformer substation is characterized by comprising the following steps:
s1, determining the number of configured direct current power supply systems according to the voltage grade of the transformer substation;
s2, determining the capacity of the storage battery pack of the direct-current power supply system according to the load size and the discharge duration of the direct-current power supply and various discharge capacities within the accident time, so that the storage battery pack can meet the discharge requirement of not less than 10h under the alternating-current power failure;
s3, determining the number of the single batteries according to the charging voltage, the float charging voltage of the single batteries of the storage battery pack and the total float charging voltage of the storage battery pack;
s4, the total current of the charging modules is more than or equal to the sum of the current when the constant load current in the station and the capacity of the storage battery pack can meet the condition that the discharge is not less than 10h, and the number of the charging modules of the direct-current power supply system is determined according to the total current of the charging modules and the rated output current of the charging modules;
and S5, determining the number of the power supply modules of the direct current power supply system according to the total current of the power supply modules and the rated output current of the power supply modules, wherein the total current of the power supply modules is larger than or equal to the frequent load current in the station.
2. The substation dc power supply system configuration method according to claim 1, wherein the S1 includes:
judging whether the voltage grade of the transformer substation is greater than or equal to 110 kV;
if so, the number of the configured direct current power supply systems is 2, otherwise, the number of the configured direct current power supply systems is 1.
3. The substation dc power supply system configuration method according to claim 2, wherein the S4 further includes:
the number of the charging modules is configured by adopting N +1 redundancy, wherein N is a minimum integer larger than the ratio of the total current of the charging modules to the rated output current of the charging modules.
4. The substation dc power supply system configuration method according to claim 3, wherein the S5 includes:
the number of the power supply modules is configured by adopting M +1 redundancy, wherein M is a minimum integer larger than the ratio of the total current of the power supply modules to the rated output current of the power supply modules.
5. The substation dc power supply system configuration method of claim 4, wherein the S5 further comprises:
and configuring a monitoring device for the charging module and the power supply module to monitor the alternating voltage, and sending an alarm signal and an action signal to disconnect the alternating current input to the charging module and the power supply module after the alternating voltage exceeds a threshold range.
6. The substation dc power supply system configuration method of claim 5, wherein the step S5 is followed by:
and the working range of the alternating current power supply voltage of the direct current high-frequency switch power supply module is 85-120% of rated voltage.
7. The configuration method of the substation direct-current power supply system according to claim 1, wherein the capacity and specification model, manufacturer brand, voltage parameter and current parameter of the single battery configured by the storage battery pack are the same, the ratio of the average charging voltage to the floating charging voltage of the storage battery pack is 1.03-1.05, and 108 single batteries with the floating charging voltage of 2.25V or 18 single batteries with the floating charging voltage of 13.5V are configured by the storage battery pack.
8. The substation direct-current power supply system configuration method according to any one of claims 1 to 7, further comprising direct-current interconnection isolating switches arranged between control buses and combination buses of direct-current feed screens of 2 sets of the direct-current power supply systems.
9. The substation dc power supply system configuration method of claim 8, further comprising a silicon link voltage step-down device disposed between a closing bus and a control bus of the dc power supply system.
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| CN202110228852.6A CN112994223A (en) | 2021-03-02 | 2021-03-02 | Configuration method of direct-current power supply system of transformer substation |
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| CN202110228852.6A CN112994223A (en) | 2021-03-02 | 2021-03-02 | Configuration method of direct-current power supply system of transformer substation |
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