CN211063334U - Inrush current prevention system for power transmission of transformer substation based on power electronic compensation - Google Patents
Inrush current prevention system for power transmission of transformer substation based on power electronic compensation Download PDFInfo
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- CN211063334U CN211063334U CN202020046393.0U CN202020046393U CN211063334U CN 211063334 U CN211063334 U CN 211063334U CN 202020046393 U CN202020046393 U CN 202020046393U CN 211063334 U CN211063334 U CN 211063334U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 44
- 230000002265 prevention Effects 0.000 title claims description 35
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 57
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 51
- 239000010703 silicon Substances 0.000 claims abstract description 51
- 230000008878 coupling Effects 0.000 claims abstract description 41
- 238000010168 coupling process Methods 0.000 claims abstract description 41
- 238000005859 coupling reaction Methods 0.000 claims abstract description 41
- 239000000178 monomer Substances 0.000 claims abstract description 25
- 238000010276 construction Methods 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract 1
- 230000006378 damage Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to a prevent inrush current system based on power electronic compensation transformer substation power transmission, including voltage coupling module, prevent inrush current module, silicon controlled rectifier subassembly and control circuit, voltage coupling module, prevent inrush current module, silicon controlled rectifier subassembly are connected with control circuit respectively, voltage coupling module is used for coupling voltage to the circuit in; the silicon controlled component is used for conducting the silicon controlled monomer according to the voltage signal; the anti-inrush current module is used for protecting the impact of current on a system; the control circuit is used for controlling the silicon controlled component and the anti-inrush current module according to the voltage signal to conduct a loop. The utility model discloses a set up voltage coupling module, prevent the module of shoving, utilize the order switching and the power transmission initialization of control switch device to select to switch on the return circuit and keep, construction volume when reducible equipment fixing, make the return circuit can bear short-term high impulse current, reduce line voltage shock time, protect advantages such as higher level switch, reliability height.
Description
Technical Field
The utility model belongs to the technical field of the distribution network, concretely relates to prevent system of shoving based on power electronic compensation transformer substation's power transmission.
Background
In the related art, according to the power transmission rule of the line, the line equipment is not allowed to carry load power transmission when power is transmitted, otherwise, strong impact current is generated, so that the equipment is damaged in a breakdown manner, and even a superior switch is tripped. For a power electronic compensation substation, the problem of damage to equipment caused by impact current generated when a load is carried after no-load power transmission and no-load power transmission needs to be solved, namely, the research and development of a power electronic compensation substation power transmission anti-inrush current technology has a remarkable significance in improving equipment reliability and even line reliability.
The inrush current generated if the device is powered on load can cause serious damage to the device.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at overcoming the not enough of prior art, provide one kind and prevent the damage problem that the inrush current system caused to equipment in order to solve impulse current based on power electronic compensation transformer substation power transmission.
In order to realize the above purpose, the utility model adopts the following technical scheme: an inrush current system is prevented in transmission of transformer substation based on power electronic compensation includes: the device comprises a voltage coupling module, an inrush current prevention module, a silicon controlled component and a control circuit, wherein the voltage coupling module, the inrush current prevention module and the silicon controlled component are respectively connected with the control circuit;
the voltage coupling module is used for coupling voltage into a line;
the silicon controlled component is used for conducting the silicon controlled monomer according to the voltage signal;
the anti-inrush current module is used for protecting the damage of an impact current to a system;
the control circuit is used for controlling the silicon controlled component and the anti-inrush current module according to the voltage signal so as to conduct a loop.
Further, the thyristor assembly comprises:
the silicon controlled rectifier comprises a first silicon controlled rectifier monomer, a second silicon controlled rectifier monomer, a third silicon controlled rectifier monomer, a fourth silicon controlled rectifier monomer, a first fuse and a second fuse;
the second silicon controlled single body and the first fuse are connected in parallel after being connected in series, and the third silicon controlled single body and the second fuse are connected in parallel after being connected in series.
Further, the anti-inrush module includes:
the input end of the voltage coupling module is connected with the input end of a power supply, the output end of the voltage coupling module is connected with the input end of the vacuum contactor, and the output end of the vacuum contactor is connected with the output end of the power supply; one end of the controllable silicon group is connected with the voltage coupling module, the other end of the controllable silicon group is connected with the control circuit, and the vacuum contactor is connected with the control circuit.
Further, the anti-inrush module includes:
a first resistor and a control switch;
the first resistor is connected with the control switch in series and then connected to two ends of the voltage coupling module in parallel.
Further, the anti-inrush current module further includes:
a second resistor and a third resistor;
the second resistor is connected in parallel at two ends of the first silicon controlled rectifier monomer, and the third resistor is connected in parallel at two ends of the fourth silicon controlled rectifier monomer.
Further, the control circuit includes:
and the central processing unit is used for controlling the inrush current prevention module according to the voltage signal output by the voltage coupling module so as to conduct a loop.
Further, the thyristor assembly further comprises:
a fourth resistor and a varistor;
and the fourth resistor and the piezoresistor are connected in series and then connected in parallel at two ends of the voltage coupling module.
Furthermore, a main circuit of the control circuit is connected with a single-stage circuit breaker.
Further, the voltage coupling module includes:
a transformer.
Further, the central processing unit adopts a chip DSP TMS 320-F28335.
The utility model adopts the above technical scheme, the beneficial effect that can reach includes:
the power-electronic-compensation-based transformer substation power transmission inrush current prevention system can be applied to various types of power supply lines, such as 6kv power supply lines, 10kv power supply lines, 35kv power supply lines or other voltage power supply lines.
According to the inrush current prevention system for power transmission of the power electronic compensation-based substation, the problem of damage to equipment caused by impact current is solved by utilizing sequential switching of control switch devices and power transmission initialization to select a conduction loop to keep. The application provides a technical scheme reducible construction volume when equipment fixing, can bear the high impulse current of short-term, reduce line voltage oscillation time, protect higher level switch, advantages such as reliability height.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only 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 structural diagram of a power transmission inrush current prevention system of a substation based on power electronic compensation according to the present invention;
fig. 2 is an inrush topology diagram of the power electronic compensation-based substation during power transmission provided by the present invention;
fig. 3 is an inrush current prevention topological diagram for power transmission of the substation based on power electronic compensation provided by the present invention;
fig. 4 is an inrush current prevention topological diagram for power transmission of the substation based on power electronic compensation provided by the present invention;
fig. 5 is an inrush current preventing topological diagram for switching of voltage gears of the substation based on power electronic compensation;
fig. 6 is an inrush current preventing topological diagram for switching of voltage gears of the substation based on power electronic compensation;
fig. 7 is an inrush current preventing topological diagram for switching of voltage gears of the substation based on power electronic compensation;
fig. 8 is a schematic view of the impact current when the power electronic compensation-based substation line suddenly fails;
fig. 9 is a inrush current topological diagram when the power electronic compensation-based substation suddenly fails;
fig. 10 is the utility model provides a prevent inrush current topological diagram when having a power failure suddenly based on power electronic compensation transformer substation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A specific inrush current prevention system for substation power transmission based on power electronic compensation provided in the embodiments of the present application is described below with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a prevent inrush current system based on power electronic compensation transformer substation power transmission, include: the device comprises a voltage coupling module 1, an inrush current prevention module 2, a silicon controlled component 3 and a control circuit 4, wherein the voltage coupling module 1, the inrush current prevention module 2 and the silicon controlled component 3 are respectively connected with the control circuit 4;
the voltage coupling module 1 is used for coupling voltage into a line;
the silicon controlled component 3 is used for conducting the silicon controlled single body according to the voltage signal;
the anti-inrush current module 2 is used for protecting the damage of the inrush current to the system;
the control circuit 4 is used for controlling the silicon controlled component 3 and the anti-inrush current module 2 according to the voltage signal to conduct a loop.
At the moment of power transmission of the power electronic compensation transformer substation, because the number of transformers in the rear end platform area of the equipment is large, large impact current is generated and returned to the power electronic compensation transformer substation, and is returned to the silicon controlled assembly 3 through the voltage coupling module 1, and the silicon controlled assembly 3 can be damaged due to large current.
The application provides a working principle of preventing inrush current system based on power electronic compensation transformer substation power transmission is that, when the power transmission, when the voltage gear switches over or when cutting off the power supply, utilize control circuit 4 control to prevent the order switching and the power transmission initialization of inrush current module 2 and relevant device and select to switch on the return circuit and keep to make silicon controlled rectifier component 3 can bear the high impulse current in short-term, reduce the circuit voltage oscillation time, protect higher level's switch.
It should be noted that the power electronic compensation based substation power transmission inrush current prevention system can be applied to various types of power supply lines, such as a 6kv power supply line, a 10kv power supply line, a 35kv power supply line, or other power supply lines. In the present application, a 10kv power supply line is taken as an example.
The voltage coupling module 1 adopts a transformer T2.
Preferably, the control circuit 4 includes:
and the central processing unit (not shown in the figure) is used for controlling the inrush current prevention module 2 according to the voltage signal output by the voltage coupling module 1 so as to conduct a loop.
The central processing unit adopts a chip DSP TMS 320-F28335.
Preferably, in the present application, as shown in fig. 2, the thyristor assembly 3 includes:
the fuse comprises a first silicon controlled monomer K1, a second silicon controlled monomer K2, a third silicon controlled monomer K3, a fourth silicon controlled monomer K4, a first fuse Fu1 and a second fuse Fu 2;
the second silicon controlled monomer K2 and the first fuse Fu1 are connected in series and then connected in parallel with the first silicon controlled monomer K1, and the third silicon controlled monomer K3 and the second fuse Fu2 are connected in series and then connected in parallel with the fourth silicon controlled monomer K4.
Specifically, the generation of line inrush current is divided into three types: inrush current when power is transmitted, inrush current when voltage gears are switched, and inrush current when power is cut off.
In the first case, inrush current occurs when power is transmitted;
as shown in fig. 2, when the power electronic compensation substation does not adopt the inrush current prevention technology to supply power, a large inrush current generated by a line returns to the thyristor monomer K1-K4 of the control loop through the voltage coupling module 1, at this time, the thyristor monomer K1-K4 is not attracted, and the inrush current causes energy accumulation at the position to exceed the operating parameters of the thyristor, so that the thyristor K1-K4 breaks down, and L and N short-circuit fuses Fu1 and Fu2 break down to cause the loop to break down and damage equipment.
In some embodiments, as shown in fig. 3, in the power electronic compensation-based substation power transmission inrush current prevention system provided in the embodiments of the present application, the inrush current prevention module 2 includes:
the input end of the voltage coupling module is connected with the power supply input end, the output end of the voltage coupling module is connected with the input end of the vacuum contactor, and the output end of the vacuum contactor is connected with the power supply output end; one end of the controllable silicon group is connected with the voltage coupling module 1, the other end of the controllable silicon group is connected with the control circuit 4, and the vacuum contactor is connected with the control circuit 4.
Specifically, as shown in fig. 3, in order to avoid damage to the equipment caused by instantaneous inrush current during power transmission, a vacuum contactor KM is additionally arranged on the output side, when the vacuum contactor KM is in an off state during power transmission, after the equipment is powered on, the control circuit 4 selects a circuit without fuse protection as a conducting circuit, that is, the first thyristor K1 and the fourth thyristor K4 are closed for a certain time T, at this time, the transformer T2 controls the side circuit to be in a normal working state, the vacuum contactor KM is automatically closed after the time T, and inrush current is generated after the vacuum contactor KM is closed, as shown in fig. 4, because the first thyristor K1 and the fourth thyristor K4 are already in a closed state to form a circuit, energy cannot be accumulated, and because the instantaneous bearable current of the thyristor assembly 3 is 10 times of the rated current thereof, no damage is caused to the thyristor assembly, because the second thyristor K2, The third thyristor K3 is in an off state, no inrush current flows through, and the fuses Fu1 and Fu2 are not blown. The mode is adopted, so that the equipment cannot be damaged at the power transmission moment, and the on-load power transmission function of the power electronic compensation substation is realized.
In the second case, inrush current occurs during voltage gear shifting;
when the control part of the power electronic compensation substation is switched, the transformer T2 can be equivalent to a current source, namely the control side is not allowed to be disconnected, if the disconnection occurs in the switching process, inrush current is generated, fuses Fu1 and Fu2 are blown, and even a silicon controlled component is broken down.
In some embodiments, as shown in fig. 5 and fig. 6, in the power electronic compensation-based substation power transmission inrush current prevention system provided in the embodiments of the present application, the inrush current prevention module 2 includes:
a first resistor R1 and a control switch KR 1;
the first resistor R1 is connected in series with the control switch KR1 and then connected in parallel across the voltage coupling module 1.
Specifically, the first resistor R1 and the control switch KR1 are added in parallel on the primary side of the transformer T2. When the compensation substation is switched from the K1 and K4 to the K2 and K3, KR1 is firstly switched on to connect the first resistor R1 in parallel with the coil on one side of the transformer T2, and K1 and K4 are then switched off, at the moment, the coil of the transformer T2 forms a loop with R1 through KR1, as shown in FIG. 6, the primary side of T2 is prevented from being opened, at the moment, K2 and K3 are closed, and KR1 is switched off in a delayed manner, as shown in FIG. 7, and switching is completed. In the whole switching process, due to the matched use of the first resistor R1 and the control switch KR1, the current source on the primary side of the T2 has no open circuit phenomenon, so that the inrush current cannot be generated to damage equipment.
In the third situation, inrush current occurs when the line is powered off;
as shown in fig. 8, when the power electronic compensation substation operates normally, the line is suddenly powered off, and the line transformer needs to release energy, which tends to form a short-term inrush current in the line. The turn-off condition of the thyristor is as follows: 1) turning off a gate driving signal, 2) turning off when the next voltage crosses zero after the driving signal is lost, if K2 and K3 are in a closed state during power failure, normally turning off should be turned off at a point a, due to line power failure and voltage waveform distortion, the zero crossing point is prolonged from a point a to a point b, K2 and K3 cannot be turned off after the driving signal is lost, the line is still in a conducting state, at the moment, a platform transformer in the line releases energy to generate impact current, a loop is formed by K2 and K3, and as shown in FIG. 9, fuses Fu1 and Fu2 are burnt out due to large current.
In some embodiments, as shown in fig. 10, the anti-inrush module 2 further includes:
a second resistor R2 and a third resistor R3;
the second resistor R2 is connected in parallel at two ends of the first thyristor K1, and the third resistor R3 is connected in parallel at two ends of the fourth thyristor K4.
Specifically, as shown in fig. 10, a second resistor R2 and a third resistor R3 are additionally arranged in the power electronic compensation substation device for absorbing line inrush current so as to protect thyristors and fuses. When the line is powered off, the R2 and R3 absorb most of impact current, so that the current flowing through the K2 and K3 is small current, and the fuse cannot be burnt. When K1-K4 are all disconnected, the surge current forms a loop through R2 and R3, and the thyristor is protected from being broken down by the surge current when the power is cut off.
According to the method and the device, by additionally installing partial hardware and combining with the delay control of a software program, the damage to the equipment caused by inrush current generated in three aspects of electrification, adjustment and power failure is solved, and the equipment runs more stably, safely and reliably in a circuit.
Preferably, as shown in fig. 3, the thyristor assembly 3 further includes:
fourth resistor R4 and piezoresistor RV1；
The fourth resistor R4 and the piezoresistor RV1And the two ends of the voltage coupling module 1 are connected in parallel after being connected in series.
Preferably, a single-stage circuit breaker is connected to the main circuit of the control circuit 4.
Specifically, the single-stage circuit breaker is arranged to prevent the abnormality or fault of the power supply from entering the control circuit and further causing short circuit or other faults to destroy electrical elements in the control circuit.
To sum up, the utility model provides a prevent system of shoving based on power electronic compensation transformer substation power transmission is through setting up voltage coupling module, preventing shoving module, silicon controlled rectifier subassembly and control circuit, utilizes the order switching and the power transmission initialization of control switch device to select the switch-on loop to keep, solves the harm problem that impulse current caused equipment. The application provides a technical scheme reducible construction volume when equipment fixing, can bear the high impulse current of short-term, reduce line voltage oscillation time, protect higher level switch, advantages such as reliability height.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a prevent inrush current system based on power electronic compensation transformer substation power transmission which characterized in that includes: the device comprises a voltage coupling module, an inrush current prevention module, a silicon controlled component and a control circuit, wherein the voltage coupling module, the inrush current prevention module and the silicon controlled component are respectively connected with the control circuit;
the voltage coupling module is used for coupling voltage into a line;
the silicon controlled component is used for conducting the silicon controlled monomer according to the voltage signal;
the anti-inrush current module is used for protecting the impact of current on a system;
the control circuit is used for controlling the silicon controlled component and the anti-inrush current module according to the voltage signal so as to conduct a loop.
2. The power electronic compensation based substation power transmission inrush current prevention system of claim 1, wherein the thyristor assembly comprises:
the silicon controlled rectifier comprises a first silicon controlled rectifier monomer, a second silicon controlled rectifier monomer, a third silicon controlled rectifier monomer, a fourth silicon controlled rectifier monomer, a first fuse and a second fuse;
the second silicon controlled single body and the first fuse are connected in parallel after being connected in series, and the third silicon controlled single body and the second fuse are connected in parallel after being connected in series.
3. The power electronic compensation based substation power transmission inrush current prevention system of claim 2, wherein the inrush current prevention module comprises:
the input end of the voltage coupling module is connected with the input end of a power supply, the output end of the voltage coupling module is connected with the input end of the vacuum contactor, and the output end of the vacuum contactor is connected with the output end of the power supply; one end of the controllable silicon group is connected with the voltage coupling module, the other end of the controllable silicon group is connected with the control circuit, and the vacuum contactor is connected with the control circuit.
4. The power electronic compensation based substation power transmission inrush current prevention system of claim 2 or 3, wherein the inrush current prevention module comprises:
a first resistor and a control switch;
the first resistor is connected with the control switch in series and then connected to two ends of the voltage coupling module in parallel.
5. The power electronic compensation based substation power transmission inrush current prevention system of claim 4, wherein the inrush current prevention module further comprises:
a second resistor and a third resistor;
the second resistor is connected in parallel at two ends of the first silicon controlled rectifier monomer, and the third resistor is connected in parallel at two ends of the fourth silicon controlled rectifier monomer.
6. The power electronic compensation based substation power transmission inrush current prevention system of claim 5, wherein the control circuit comprises:
and the central processing unit is used for controlling the inrush current prevention module according to the voltage signal output by the voltage coupling module so as to conduct a loop.
7. The power electronic compensation based substation power transmission inrush current prevention system of claim 5, wherein the thyristor assembly further comprises:
a fourth resistor and a varistor;
the fourth resistor is connected in parallel with two ends of the voltage coupling module after being connected in series.
8. The power electronic compensation based substation power transmission inrush current prevention system of claim 1,
and a main circuit of the control circuit is connected with a single-stage circuit breaker.
9. The power electronic compensation based substation power transmission inrush current prevention system of claim 5, wherein the voltage coupling module comprises:
a transformer.
10. The power electronic compensation based substation power transmission inrush current prevention system of claim 6,
the central processing unit adopts a chip DSP TMS 320-F28335.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020046393.0U CN211063334U (en) | 2020-01-09 | 2020-01-09 | Inrush current prevention system for power transmission of transformer substation based on power electronic compensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020046393.0U CN211063334U (en) | 2020-01-09 | 2020-01-09 | Inrush current prevention system for power transmission of transformer substation based on power electronic compensation |
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| CN211063334U true CN211063334U (en) | 2020-07-21 |
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| CN202020046393.0U Active CN211063334U (en) | 2020-01-09 | 2020-01-09 | Inrush current prevention system for power transmission of transformer substation based on power electronic compensation |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Power transmission and anti inrush current system of substation based on power electronic compensation Effective date of registration: 20210830 Granted publication date: 20200721 Pledgee: Ji'nan rural commercial bank Limited by Share Ltd. high tech branch Pledgor: JINAN LAFEIYE ELECTRIC POWER SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2021980008642 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220829 Granted publication date: 20200721 Pledgee: Ji'nan rural commercial bank Limited by Share Ltd. high tech branch Pledgor: JINAN LAFEIYE ELECTRIC POWER SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2021980008642 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Based on power electronic compensation substation power transmission and anti-inrush current system Effective date of registration: 20220831 Granted publication date: 20200721 Pledgee: Ji'nan rural commercial bank Limited by Share Ltd. high tech branch Pledgor: JINAN LAFEIYE ELECTRIC POWER SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2022370000114 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Granted publication date: 20200721 Pledgee: Ji'nan rural commercial bank Limited by Share Ltd. high tech branch Pledgor: JINAN LAFEIYE ELECTRIC POWER SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2022370000114 |