CN211830132U - Line icing eliminating device for pumped storage station - Google Patents
Line icing eliminating device for pumped storage station Download PDFInfo
- Publication number
- CN211830132U CN211830132U CN201921112296.0U CN201921112296U CN211830132U CN 211830132 U CN211830132 U CN 211830132U CN 201921112296 U CN201921112296 U CN 201921112296U CN 211830132 U CN211830132 U CN 211830132U
- Authority
- CN
- China
- Prior art keywords
- line
- direct current
- ice
- melting
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003860 storage Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 abstract description 13
- 230000008030 elimination Effects 0.000 abstract description 2
- 238000003379 elimination reaction Methods 0.000 abstract description 2
- 238000002844 melting Methods 0.000 description 66
- 230000008018 melting Effects 0.000 description 55
- 238000005516 engineering process Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Images
Landscapes
- Rectifiers (AREA)
Abstract
The utility model belongs to the technical field of line icing elimination, in particular to a line icing eliminating device for a pumped storage station, wherein an alternating current power supply is rectified by a silicon controlled rectifier valve to form direct current voltage with adjustable size; the direct current voltage is applied to the ground wire to be melted which is short-circuited at the opposite side, so that direct current is formed on the line; because the transmission line is a resistor, Joule heat can be generated on the line by the direct current of the resistor, so that the temperature of the transmission line is increased; the method is simple in principle and practical in value, uniform deicing can be performed on a medium loss deicing method, electric energy loss is low, and movement is relatively easy.
Description
Technical Field
The utility model relates to a circuit icing eliminates technical field, especially relates to a pumped storage station is with circuit icing remove device.
Background
The line icing intelligent elimination technology adopts a direct-current ice melting method, and an alternating-current power supply is converted into direct current through high-capacity power electronic equipment so as to heat an icing line with a certain length to achieve the purpose of ice melting. When the heat generated by the direct current of the high-voltage transmission line is larger than the sum of the heat dissipation capacity of the conducting wire and the ice melting heat, the ice coated on the high-voltage transmission line can be melted. Therefore, the most basic principle of the direct-current deicing design is that the current passing through the icing line is greater than the minimum deicing current of the line and is less than the maximum allowable current of the line.
And converting the electric energy into heat energy to melt ice according to energy conservation. The power transmission line is erected and operated in a field environment and is restricted by various conditions such as environment, terrain, meteorological factors, science and technology and the like. Particularly, meteorological conditions are uncertain factors of dynamic change and are difficult to accurately measure and control;
the rectification circuit of the ice melting device needs to meet the requirements of different models and different lengths of ice coating lines, the fully-controlled rectification circuit is mature in technology, a three-phase bridge type fully-controlled rectifier consisting of thyristors is designed, the rectifier can be a pulsating rectifier or a pulsating rectifier, when the ice melting current is too large, the rectifiers can be connected in parallel, and the difficulty in design and manufacture of the rectifiers is high.
In order to solve the above problems, the present application provides a line icing removing device for a pumped storage station.
SUMMERY OF THE UTILITY MODEL
Objects of the invention
For the technical problem who exists among the solution background art, the utility model provides a pumped storage station is with circuit deicing remove device.
(II) technical scheme
In order to solve the above problem, the utility model provides a pumped storage station is with circuit ice coating remove device which characterized in that:
after the alternating current power supply is rectified by the silicon controlled rectifier valve, a direct current voltage with adjustable magnitude is formed;
the direct current voltage is applied to the ground wire to be melted which is short-circuited at the opposite side, so that direct current is formed on the line;
because the transmission line is a resistor, Joule heat can be generated on the line by the direct current of the resistor, so that the temperature of the transmission line is raised, the ice on the line is melted, the magnitude of the direct current can be continuously adjusted by controlling the trigger angle of the silicon controlled valve, and the Joule heat generated on the line is adjusted.
As the utility model relates to a pumped storage station is with preferred technical scheme of line icing remove device, alternating current power supply selects 0.38kV or 1 kV.
The above technical scheme of the utility model has following profitable technological effect: according to energy conservation, electric energy is converted into heat energy for deicing, the power transmission line is erected and operated in a field environment, the power transmission line is limited by various conditions such as environment, terrain, meteorological factors, science and technology and the like, the meteorological conditions are uncertain factors of dynamic change and difficult to accurately measure and control, and the work relates to multiple subjects such as geology, physics, materials science, mechanics and the like. The intelligent line icing eliminating technology researched by the project belongs to a short circuit ice melting method, and the method is various, mainly comprises three-phase short circuit, two-phase short circuit and single-phase short circuit in an electric power system, and the three-phase short circuit is common. The principle is as follows: the method is simple in principle and practical in value, uniform deicing can be performed on a medium loss deicing method, electric energy loss is low, and movement is relatively easy.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of mobile dc thawing.
FIG. 3 is a schematic diagram of a software design interface of the ice melting apparatus.
Fig. 4 is a view illustrating the construction of an MMC-based converter.
FIG. 5 is a diagram of ice melting power access mode.
FIG. 6 illustrates Ice melting Power connection mode 1.
FIG. 7 illustrates Ice melting Power supply connection mode 2.
FIG. 8 illustrates Ice melting Power supply connection mode 3.
FIG. 9 is a simplified diagram of ice-melting power access mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1;
fig. 1 is a schematic structural diagram of the present invention.
A line icing eliminator for a pumped storage station,
after the alternating current power supply is rectified by the silicon controlled rectifier valve, a direct current voltage with adjustable magnitude is formed;
the direct current voltage is applied to the ground wire to be melted which is short-circuited at the opposite side, so that direct current is formed on the line;
because the transmission line is a resistor, Joule heat can be generated on the line by the direct current of the resistor, so that the temperature of the transmission line is raised, the ice on the line is melted, the magnitude of the direct current can be continuously adjusted by controlling the trigger angle of the silicon controlled valve, and the Joule heat generated on the line is adjusted.
As shown in fig. 2;
FIG. 2 is a schematic diagram of mobile DC ice melting;
the method for melting ice by using the circuit for the pumped storage power station in the infrastructure period mainly comprises alternating current melting ice and direct current melting ice, wherein during melting ice, the reactance of a wire is far larger than the resistance, and the reactance component can not be considered during direct current melting ice, so that the advantage of direct current melting ice is obvious, but the line type of the wire for the pumped storage power station in the infrastructure period is smaller, and the resistance and the reactance of the wire are equal, so that the advantage of direct current melting ice is reduced compared with alternating current melting ice, and the alternating current melting ice and the direct current melting ice can be respectively carried out on the wire under different conditions.
According to the distribution characteristics of electric circuits used in the capital construction period of the pumped storage power station;
the ice melting device can be designed into several categories such as fixed type, movable type, portable type and the like:
firstly, a fixed ice melting device is built in a station, a power supply can be directly taken from a power distribution network substation, the ice melting capacity is large, and the fixed ice melting device is suitable for alternating-current ice melting;
the mobile ice melting device adopts mobile operation, a generator is generally adopted to generate electricity when power supply is difficult, and meanwhile, ice is melted by a direct current mode, so that the ice melting efficiency is improved better;
and thirdly, when some local ice is covered and the vehicle is difficult to reach, the portable direct-current ice melting device is suitable for being adopted, the ice melting distance of the device is short, the size is small, the device is suitable for being carried by a plurality of people, and the device is flexible and mobile.
Only a few spans of a line may be covered with ice and snow, and the lines requiring ice melting are short and have large length differences.
To this kind of condition, the utility model discloses the application is based on the portable circuit direct current ice-melt device of pressure regulating rectification, when needing the ice-melt, carries out the ice-melt to the icing place with the device fortune, and this mode is flexible, can satisfy the demand of circuit segmentation ice-melt betterly.
As shown in fig. 3;
FIG. 3 is a schematic diagram of a software design interface of the ice melting apparatus;
1. the uncontrollable direct current ice melting device based on the diode rectification technology has the advantages of simple structure, low cost and contribution to realizing mobile application of the device, but is only suitable for melting ice on medium and long distance lines due to the problem of voltage control;
2. the output voltage and current of the direct-current ice melting device based on the thyristor rectification technology can be continuously adjusted, and the direct-current ice melting device can be used as an SVC (static var compensator), is favorable for recycling of the device, has good economical efficiency, and is the most widely applied direct-current ice melting device at present;
3. the DC ice melting device based on the PWM rectification technology has better electric energy quality and reactive power characteristic, but is only applied to short-distance and small-capacity ice melting at present due to the cost and technical problems.
As shown in fig. 4;
fig. 4 is a view of a MMC-based converter structure;
the ice melting device of the power line adopts a modular multilevel technology, the voltage level is improved by increasing the number of power units, and compared with the traditional flexible direct-current transmission technology of two-level and three-level converter topologies, the modular multilevel flexible direct-current transmission technology (MMC-HVDC) based on the MMC inherits the characteristics of the flexible direct-current transmission technology and embodies more new technical advantages;
the ideal main circuit topological structure of the large-capacity converter can preferably reduce the direct series number of power electronic devices and the switching frequency of the devices, simplify the main circuit topological structure of the system and effectively reduce the complexity of a control protection system and the main circuit;
the structure of the current converter based on the bridge arm is high in modularization degree, integration is facilitated, cost is reduced, and reliability of a system is improved; moreover, the more levels enable the relatively lower failure rate of single devices, so that the personality is more suitable for application in large-capacity occasions;
the redundancy characteristic of the sub-modules enables the failed sub-modules to be replaced by the redundant sub-modules, and when the system has serious failure, the impact current can be limited to a lower rising level, so that the running reliability of the system is improved;
the problem of static and dynamic voltage sharing caused by direct series connection of devices in the structure is solved, the output waveform of a current converter based on the voltage sharing circuit is smooth, the quality is good, the voltage sharing circuit is similar to a standard sinusoidal voltage, the harmonic content is low, the economical efficiency of a system is improved, and the configuration requirement and impact on an alternating current transformer are low;
l, V, W is a three-phase input, is a submodule unit and is a bridge arm reactor.
As shown in fig. 5-8;
FIG. 5 is a diagram of ice-melting power access;
FIG. 6 illustrates Ice melting Power supply connection mode 1;
FIG. 7 illustrates Ice melting Power supply connection mode 2;
FIG. 8 illustrates Ice melting Power supply connection mode 3;
the pumped storage power station is wide in power circuit distribution during the infrastructure period, part of ice-covered circuits are distributed in mountainous areas where vehicles are not easy to reach, and the vehicles of the mobile ice melting device cannot reach. The automatic phase-changing technology can set a line ice-melting sequence in the ice-melting operation, is automatically completed by a system, and adopts an automatic ice-melting switching method, wherein the ice-melting current output is regulated in a stepless manner through a power supply, and meanwhile, the switches K1-K5 are controlled to be switched according to the line load condition under the condition of not stopping the ice-melting power supply, and the line is automatically switched in by adopting a one-in-two-circuit wiring mode;
a, B, C are each three-phase access points to the load lines.
And (3) access mode: the ice melting load is divided by switching on and off the circuit breaker, automatic switching of one-in-two-circuit connection lines of the circuit load is completed by switching the switches K1-K5, three-phase circulating ice melting of the circuit can be achieved by changing the switching on and off states of the pair of switches every time, and the following three ice melting access working modes are provided specifically.
Mode 1: phase a advances, phase B, C returns: k1, K3, K5 are closed, K2 and K4 are split;
mode 2: phase B advances, phase A, C returns: k2, K3, K4 are closed, K1 and K5 are split; on the basis of the mode 1, K1 is disconnected, and K4 is closed;
mode 3: phase C advances, phase A, C returns: k1, K2, K3 are closed, K4 and K5 are split; namely, on the basis of the mode 1, K5 is firstly switched off, and then K3 is switched on.
Three-phase circulating ice melting of a circuit can be realized only by changing the switching-on and switching-off states of the pair of switches, wherein the K1 and the K4 are interlocked, and the K2 and the K5 are interlocked, so that the direct-current short-circuit fault caused by misoperation of the switches is prevented; the protection method for the short circuit problem of the load line in the fusing process can be performed by detecting the half-voltage state by using the middle grounding capacitor, and as shown in fig. 4-8, the faults of short circuit, grounding and the like which may exist on the direct current side are processed. Wherein R1 and R2 are the ground resistance at the two ends of the ice-melting power supply output respectively, and the two resistances are the same.
As shown in fig. 9;
FIG. 9 is a simplified diagram of ice-melting power access mode.
When the ice melting access circuit is switched, the ice melting power supply does not need to stop working, and the three circuit access working modes can be switched only by controlling the output to be zero current and the on-off of the access switch, so that the three-phase circulating automatic ice melting is completed. In the process of ice melting, whether the ice melting is normally finished or not needs to be comprehensively judged according to the ice melting time and the line temperature. When the ice-melting switch is switched, the ice-melting chopping pulse is blocked, and meanwhile, whether the system switch state and the line current are zero or not needs to be detected.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (2)
1. The utility model provides a pumped storage station is with circuit deicing remove device which characterized in that:
after the alternating current power supply is rectified by the silicon controlled rectifier valve, a direct current voltage with adjustable magnitude is formed;
the direct current voltage is applied to the ground wire to be melted which is short-circuited at the opposite side, so that direct current is formed on the line;
because the transmission line is a resistor, Joule heat can be generated on the line by the direct current of the resistor, so that the temperature of the transmission line is raised, the ice on the line is melted, the magnitude of the direct current can be continuously adjusted by controlling the trigger angle of the silicon controlled valve, and the Joule heat generated on the line is adjusted.
2. The pumped-storage station line icing eliminator according to claim 1, wherein said alternating current power source is selected to be 0.38kV or 1 kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921112296.0U CN211830132U (en) | 2019-07-16 | 2019-07-16 | Line icing eliminating device for pumped storage station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921112296.0U CN211830132U (en) | 2019-07-16 | 2019-07-16 | Line icing eliminating device for pumped storage station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211830132U true CN211830132U (en) | 2020-10-30 |
Family
ID=72994463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921112296.0U Active CN211830132U (en) | 2019-07-16 | 2019-07-16 | Line icing eliminating device for pumped storage station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211830132U (en) |
-
2019
- 2019-07-16 CN CN201921112296.0U patent/CN211830132U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101345419B (en) | Series voltage quality regulator and fast investment and cutting method | |
| CN105162155A (en) | Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability | |
| Miura et al. | Modular multilevel matrix converter for low frequency AC transmission | |
| WO2015131517A1 (en) | Direct-current de-icing device based on voltage source type converter and control method therefor | |
| CN201274399Y (en) | DC great current deicing apparatus with static state reactive compensation function | |
| CN101673950B (en) | Static var compensator (SVC) and DC ice melting device and realization method thereof | |
| CN113991662B (en) | LCC-MMC-based energy routing system and direct current fault protection method | |
| CN102496898A (en) | Bifunctional direct current ice melting apparatus based on voltage source type current converter and ice melting method thereof | |
| CN109494615B (en) | Method for realizing ice melting of power distribution network by manufacturing active circulation current through flexible multi-state switch | |
| CN108189712A (en) | A kind of electric railway ground flexible auto-passing neutral section system | |
| CN105914692A (en) | Full bridge type MMC direct current ice melting apparatus and control method therefor | |
| CN107846042A (en) | A kind of method for improving fossil power plant auxiliary engine frequency converter high-low pressure ride-through capability | |
| CN105137212B (en) | A kind of high-speed power electrical switch realizes the method for short-circuit test between converter valve polar curve | |
| WO2023134225A1 (en) | Low-frequency power transmission system and control mode therefor | |
| Kale et al. | Integration of proactive hybrid circuit breaker with current flow controller for bipolar HVDC grid | |
| CN202798507U (en) | DC ice melting device based on full-bridge modular multi-level converter | |
| CN103078287A (en) | Direct-current high-current ice-melting device with STATCOM function | |
| CN110932215A (en) | System and method for deicing overhead line by using photovoltaic power generation | |
| CN109066762B (en) | Flexible direct-current transmission alternating-current operation method | |
| CN111030105A (en) | Low-voltage ride through method of photovoltaic power generation system based on three-phase cascade H bridge | |
| CN111697598B (en) | Mode switching system and mode switching method for electrified railway | |
| CN203103884U (en) | DC high-current ice melting apparatus with STSTCOM function | |
| CN211830132U (en) | Line icing eliminating device for pumped storage station | |
| CN201623436U (en) | Direct-current ice melting device capable of being multiplexed into TSC | |
| CN206049416U (en) | Single phase power supply device, electric railway traction power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |