CN109193920A - A kind of cyclization tune electric control system and method based on controllable inductor - Google Patents
A kind of cyclization tune electric control system and method based on controllable inductor Download PDFInfo
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- CN109193920A CN109193920A CN201811122962.9A CN201811122962A CN109193920A CN 109193920 A CN109193920 A CN 109193920A CN 201811122962 A CN201811122962 A CN 201811122962A CN 109193920 A CN109193920 A CN 109193920A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007363 ring formation reaction Methods 0.000 title abstract 13
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 24
- 230000001276 controlling effect Effects 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract 1
- 230000003750 conditioning effect Effects 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
Classifications
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Business, Economics & Management (AREA)
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- Control Of Electrical Variables (AREA)
Abstract
A kind of cyclization tune electric control system and method based on controllable inductor provided by the present application, cyclization tune electric control system of the one of which based on controllable inductor includes cyclization tune controller for electric consumption and the double circuit selector, breaker, current transformer, bidirectional triode thyristor and the controllable inductor that are sequentially connected in series, in this way, according to the voltage of the cyclization point two sides of cyclization tune controller for electric consumption monitoring, and obtain the voltage difference of the two sides the cyclization Dian Chu；The cyclization tune controller for electric consumption obtains the voltage difference of cyclization point two sides and judges the side that voltage is high in cyclization point two sides, and double circuit selector issues control instruction at this time, and automatically selecting the high side of voltage is controlled plant；By the pilot angle for controlling bidirectional triode thyristor, the reactive power that controllable inductor absorbs is controlled, the voltage of the high side of voltage is reduced, until the voltage of the two sides the cyclization Dian Chu meets cyclization condition, cyclization instruction is issued at this time and completes Loop Closing Operation, guarantees the stability of power supply.
Description
Technical Field
The application relates to the technical field of power distribution networks, in particular to a closed-loop power conditioning control system and method based on a controllable inductor.
Background
With the continuous acceleration of the social process, the requirement for the power supply reliability is continuously improved, the power supply reliability is a main index for measuring the quality and the function of the power system, correspondingly, the power distribution network is also in the continuous development process, a closed-loop wiring and open-loop operation mode is formed, and when a certain section of line breaks down in the closed-loop process, the other section of line can be seamlessly replaced.
When the load transfer or line maintenance is needed to be carried out on the power distribution network, the traditional method is that a power failure transfer power supply mode is adopted, and operation and maintenance personnel manually carry out power failure switching operation, so that the power supply is discontinuous, the requirement of transferring the load without power failure is not met, and the power supply safety risk is increased.
Disclosure of Invention
The application provides a closed-loop power-regulating control system and method based on a controllable inductor, and aims to solve the problem of discontinuous power supply caused by power failure and switching in the prior art.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
the application provides a pair of close ring transfer electric control system based on controllable inductor, including set up in the close ring transfer electric control device that closes of ring point department and the double circuit selector, circuit breaker, current transformer, controllable inductor and the bidirectional thyristor who establishes ties in proper order, close ring transfer electric control device respectively with double circuit selector, circuit breaker, current transformer, controllable inductor and bidirectional thyristor are electric to be connected, wherein:
the loop closing and power adjusting control device is used for acquiring voltages on two sides of a loop closing point and acquiring a voltage difference on the two sides of the loop closing point;
the closed-loop power conditioning control device is used for sending a control instruction to the double-circuit selector and automatically selecting one side with higher voltage in two sides of the closed-loop point as a conditioning object;
the controllable inductor is used for absorbing the reactive power of one side with high voltage in the two sides of the loop closing point and reducing the voltage of one side with high voltage in the two sides of the loop closing point;
and controlling the reactive power absorbed by the controllable inductor by controlling the control angle of the bidirectional controllable silicon.
Preferably, the closed-loop power conditioning control system further includes a grounding switch, and the grounding switch is connected between the dual-circuit selector and the circuit breaker.
Preferably, the inductance of the controllable inductor is 0.01-1H.
The application also provides a closed-loop power-regulating control method based on the controllable inductor, which comprises the following steps:
acquiring and judging whether the voltage difference between two sides of the loop closing point meets the loop closing condition or not according to the voltages of the two sides of the loop closing point monitored by the loop closing and regulating control device;
if the voltage difference between the two sides of the loop closing point meets the loop closing condition, the loop closing and adjusting control device sends a loop closing instruction;
or,
if the voltage difference between the two sides of the loop closing point does not meet the loop closing condition, the loop closing and adjusting control device acquires the voltage difference between the two sides of the loop closing point and judges the side with higher voltage in the two sides of the loop closing point, and at the moment, a control instruction is sent to the double-circuit selector, and the side with higher voltage in the two sides of the loop closing point is automatically selected as an adjusting object;
and controlling the current and the absorbed reactive power of the controllable inductor by controlling the control angle of the bidirectional controllable silicon, and reducing the voltage of one side with higher voltage in two sides of the loop closing point until the voltages in the two sides of the loop closing point meet the loop closing condition, wherein the loop closing and adjusting control device sends a loop closing instruction at the moment.
Preferably, said controlling the controllable inductor current and the reactive power absorbed by controlling the control angle of the triac so as to vary the loop point voltage comprises:
according toAnd QL＝IL 2XLControlling the controllable inductor current and the reactive power absorbed, wherein:
ILeffective value of current flowing through the controllable inductor, QLFor reactive power absorbed by the controllable inductor, U is the effective value of the loop closing point voltage, XLFor inductor reactance, α is the control angle of the triac.
Compared with the prior art, the beneficial effect of this application is:
the application provides a pair of close ring transfer electric control system based on controllable inductor, including set up in the close ring transfer electric control device that closes of ring point department and the double circuit selector, circuit breaker, current transformer, controllable inductor and the bidirectional thyristor who establishes ties in proper order, close ring transfer electric control device respectively with double circuit selector, circuit breaker, current transformer, controllable inductor and bidirectional thyristor are electric to be connected, wherein: the loop closing and power adjusting control device is used for acquiring voltages on two sides of a loop closing point and acquiring a voltage difference on the two sides of the loop closing point; the closed-loop power conditioning control device is used for sending a control instruction to the double-circuit selector and automatically selecting one side with higher voltage in two sides of the closed-loop point as a conditioning object; the controllable inductor is used for absorbing the reactive power of one side with high voltage in the two sides of the loop closing point and reducing the voltage of one side with high voltage in the two sides of the loop closing point; controlling the reactive power absorbed by the controllable inductor by controlling the control angle of the bidirectional controllable silicon; thus, according to the voltage on two sides of the loop closing point monitored by the loop closing and adjusting control device, the voltage difference on two sides of the loop closing point is obtained; if the voltage difference between the two sides of the loop closing point meets the loop closing condition, the loop closing and adjusting control device sends a loop closing instruction; or, if the voltage difference between the two sides of the loop closing point does not meet the loop closing condition, the loop closing and adjusting control device acquires the voltage difference between the two sides of the loop closing point and judges the side with higher voltage in the two sides of the loop closing point, and at the moment, the double circuit selector sends out a control instruction to automatically select the side with higher voltage in the two sides of the loop closing point as an adjusting object; the reactive power absorbed by the controllable inductor is controlled by controlling the control angle of the bidirectional controllable silicon, the voltage of one side with high voltage in two sides of the loop closing point is reduced until the voltages of the two sides of the loop closing point are equal, the loop closing and adjusting control device sends a loop closing instruction at the moment, loop closing operation is completed smoothly, power failure and switching are not needed in the process, and continuity and stability of power supply are guaranteed.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a closed-loop power-regulating control system based on a controllable inductor according to the present application;
description of reference numerals: the circuit breaker comprises a 1-double circuit selector, a 2-circuit breaker, a 3-current transformer, a 4-bidirectional thyristor, a 5-controllable inductor, a 6-loop closing and regulating control device and a 7-grounding disconnecting link.
Fig. 2 is a schematic flowchart of a closed-loop power-regulating control method based on a controllable inductor according to the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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 application.
The closed-loop power-regulating control system based on the controllable inductor comprises a closed-loop power-regulating control device 6 arranged at a closed-loop point, and a double-circuit selector 1, a circuit breaker 2, a current transformer 3, a bidirectional thyristor 4 and a controllable inductor 5 which are sequentially connected in series, wherein the specific structure refers to fig. 1, and fig. 1 is a schematic structural diagram of the closed-loop power-regulating control system based on the controllable inductor; as can be seen from the figures, the system provided by the present application is suitable for three-phase alternating current; the closed-loop power adjusting control device 6 is respectively electrically connected with the double-circuit selector 1, the circuit breaker 2, the current transformer 3, the bidirectional thyristor 4 and the controllable inductor 5, wherein:
the loop closing and regulating control device 6 is used for acquiring voltages on two sides of a loop closing point and acquiring a voltage difference on the two sides of the loop closing point; if the voltage difference between the two sides of the loop closing point meets the loop closing condition, the loop closing and adjusting control device 6 sends a loop closing instruction; or, if the voltage difference between the two sides of the loop closing point does not satisfy the loop closing condition, the loop closing and regulating control device 6 acquires the voltage difference between the two sides of the loop closing point and judges one side with a high voltage in the two sides of the loop closing point, at this time, a control instruction is sent to the dual-circuit selector 1, the side with the high voltage in the two sides of the loop closing point is automatically selected as an adjustment object, and the specific loop closing condition is that the voltage amplitude difference, the frequency difference and the phase angle difference between the two sides of the loop closing point enter the set voltage amplitude difference, frequency difference and phase angle difference range, so that the loop can be closed; by controlling the control angle of the bidirectional thyristor 4, the reactive power absorbed by the controllable inductor 5 is controlled, the loop closing point voltage is subjected to closed loop control by the loop closing and adjusting control device by using PID, the control angle of the thyristor is adjusted by using a closed loop control link in PID, and the reactive power absorption value is adjusted, so that the loop closing point voltage is reduced, the voltage of one side with high voltage in two sides of the loop closing point is reduced, until the voltages of two sides of the loop closing point are equal, at the moment, the loop closing and adjusting control device 6 sends out a loop closing instruction, and the loop closing operation is smoothly completed.
The loop closing and adjusting control device 6 is used for sending a control instruction to the double circuit selector 1, automatically selecting one side with higher voltage in two sides of a loop closing point as an adjusting object, controlling reactive power absorbed by the controllable inductor 5 by controlling a control angle of the bidirectional controllable silicon 4, absorbing the reactive power on one side with higher voltage in the two sides of the loop closing point by the controllable inductor 5, and reducing the voltage on one side with higher voltage in the two sides of the loop closing point, wherein specifically, the relation between the control angle α of the bidirectional controllable silicon 4 and the reactive power Q absorbed by the controllable inductor 5 is QL＝IL 2XLAndit can be seen from the formula that the reactive power absorbed by the controllable inductor 5, specifically, the inductive reactive power, can be controlled by changing the size of the control angle α of the triac 4, at this time, the reactive power in the system is reduced by the absorption, so that the voltage in the branch at the higher side of the voltage is reduced, until the loop closing adjusting control device 6 sends out a loop closing command when judging that the voltages of the branches at the two sides of the loop closing point satisfy the loop closing condition, thereby smoothly completing the loop closing operation and improving the reliability of power supply.
Further in order to ensure the safety of the operation, the closed-loop power conditioning control system further comprises a grounding knife switch 7, wherein the grounding knife switch 7 is connected between the double-circuit selector 1 and the circuit breaker 2. When the branch double-circuit selector 1 on the side with higher voltage is determined to automatically switch and select the branch, the circuit breaker of the closed-loop power regulating control device 6 is closed, and the grounding knife switch 7 is closed and locked, so that the grounding function of the closed-loop power regulating system is realized, residual charges in the system are transferred to the ground, the induced electricity of lightning and nearby electrified equipment to overhaul equipment can be prevented, and the operation safety is ensured.
Further, the inductance of the controllable inductor 5 is 0.01-1H; the inductance can reflect the capacity of the inductor for storing magnetic field energy, the impedance in the inductor plays a role in blocking current in a circuit, the impedance is in direct proportion to the inductance, the selected inductance of the controllable inductor 5 is in a certain range, the impedance can be guaranteed to be in a certain range, namely the current blocking function in the inductor is certain, when the control angle of the bidirectional controllable silicon 4 is controlled, reactive power absorbed by the controllable inductor 5 is controlled, the voltage on the side with high voltage in the two sides of the loop closing point is reduced, impedance compensation is performed on the branch with high voltage, in order to guarantee stable operation of a system, the impedance compensation is maintained in a certain range, namely the impedance of the controllable inductor 5 is maintained in a certain range, and further the inductance of the controllable inductor 5 in the application is maintained in a range of 0.01-1H.
The present application further provides a closed-loop power-regulating control method based on a controllable inductor, which utilizes the above closed-loop power-regulating control system based on a controllable inductor, specifically referring to fig. 2, where fig. 2 is a schematic flow chart of the closed-loop power-regulating control method based on a controllable inductor provided by the present application, and the method includes:
s01: acquiring and judging whether the voltage difference between two sides of the loop closing point meets the loop closing condition or not according to the voltages of the two sides of the loop closing point monitored by the loop closing and regulating control device;
s02: if the voltage difference between the two sides of the loop closing point meets the loop closing condition, the loop closing and adjusting control device sends a loop closing instruction;
or,
s03: if the voltage difference between the two sides of the loop closing point does not meet the loop closing condition, the loop closing and adjusting control device acquires the voltage difference between the two sides of the loop closing point and judges the side with higher voltage in the two sides of the loop closing point, and at the moment, a control instruction is sent to the double-circuit selector, and the side with higher voltage in the two sides of the loop closing point is automatically selected as an adjusting object;
s04: and controlling reactive power absorbed by the controllable inductor by controlling a control angle of the bidirectional controllable silicon, and reducing the voltage of one side with higher voltage in two sides of the loop closing point until the voltages of the two sides of the loop closing point are equal, wherein the loop closing and adjusting control device sends a loop closing instruction at the moment.
According to the voltage on two sides of the loop closing point monitored by the loop closing and regulating control device, acquiring the voltage difference on two sides of the loop closing point; if the voltage difference between the two sides of the loop closing point meets the loop closing condition, the loop closing and adjusting control device sends a loop closing instruction; or, if the voltage difference between the two sides of the loop closing point does not meet the loop closing condition, the loop closing and adjusting control device acquires the voltage difference between the two sides of the loop closing point and judges the side with higher voltage in the two sides of the loop closing point, and at the moment, the double circuit selector sends out a control instruction to automatically select the side with higher voltage in the two sides of the loop closing point as an adjusting object; the reactive power absorbed by the controllable inductor is controlled by controlling the control angle of the bidirectional controllable silicon, the voltage of one side with high voltage in two sides of the loop closing point is reduced until the voltages of the two sides of the loop closing point are equal, the loop closing and adjusting control device sends a loop closing instruction at the moment, loop closing operation is completed smoothly, power failure and switching are not needed in the process, and continuity and stability of power supply are guaranteed.
Further said controlling the controllable inductor current and the reactive power absorbed by controlling the control angle of the triac to vary the loop closing point voltage comprises:
according toAnd QL＝IL 2XLControlling the controllable inductor current and the reactive power absorbed, wherein:
ILeffective value of current flowing through the controllable inductor, QLFor reactive power absorbed by the controllable inductor, U is the effective value of the loop closing point voltage, XLα is the control angle of bidirectional thyristor for inductor reactance, and U is the controlled inductance voltage-current characteristic formularef+jXSILWherein X isSIs the system equivalent impedance, UrefThe reference value of the closed loop voltage point, the purpose of controlling the voltage of the closed loop point by controlling the current of the inductor, and the controllable current can be controlled by changing the size of the control angle α of the bidirectional thyristorThe reactive power absorbed by the sensor is specifically inductive reactive power, the reactive power in the system is reduced at the moment, when the reactive power in the power grid is reduced, the voltage in the branch at the high voltage side is reduced until the loop closing adjusting control device sends out a loop closing instruction when judging that the voltages of the branches at the two sides of the loop closing point meet the loop closing condition, the loop closing operation is smoothly completed, and the reliability of power supply is improved.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (5)
1. The utility model provides a close ring and transfer electric control system based on controllable inductor which characterized in that, including set up in closing ring transfer electric control device (6) of closing ring point department and two circuit selector (1), circuit breaker (2), current transformer (3), bidirectional thyristor (4) and controllable inductor (5) that establish ties in proper order, close ring transfer electric control device (6) respectively with two circuit selector (1), circuit breaker (2), current transformer (3), bidirectional thyristor (4) and controllable inductor (5) electricity are connected, wherein:
the loop closing and regulating control device (6) is used for collecting voltages on two sides of a loop closing point and acquiring a voltage difference on the two sides of the loop closing point;
the loop closing and adjusting control device (6) is used for sending a control instruction to the double-circuit selector (1) and automatically selecting one side with higher voltage in the two sides of the loop closing point as an adjusting object;
the controllable inductor (5) is used for absorbing the reactive power of one side with high voltage in the two sides of the loop closing point and reducing the voltage of one side with high voltage in the two sides of the loop closing point;
and controlling the reactive power absorbed by the controllable inductor (5) by controlling the control angle of the bidirectional controllable silicon (4).
2. The loop closing regulating electrical control system according to claim 1, characterized by further comprising a grounding knife switch (7), said grounding knife switch (7) being connected between said dual circuit selector (1) and said circuit breaker (2).
3. The loop closing regulating electrical control system according to claim 1, characterized in that the inductance of the controllable inductor (5) is 0.01-1H.
4. A controlled inductor based loop-closing tuning control method using the controlled inductor based loop-closing tuning control system of any one of claims 1-3, the method comprising:
acquiring and judging whether the voltage difference between two sides of the loop closing point meets the loop closing condition or not according to the voltages of the two sides of the loop closing point monitored by the loop closing and regulating control device;
if the voltage difference between the two sides of the loop closing point meets the loop closing condition, the loop closing and adjusting control device sends a loop closing instruction;
or,
if the voltage difference between the two sides of the loop closing point does not meet the loop closing condition, the loop closing and adjusting control device acquires the voltage difference between the two sides of the loop closing point and judges the side with higher voltage in the two sides of the loop closing point, and at the moment, a control instruction is sent to the double-circuit selector, and the side with higher voltage in the two sides of the loop closing point is automatically selected as an adjusting object;
and controlling the current and the absorbed reactive power of the controllable inductor by controlling the control angle of the bidirectional controllable silicon, and reducing the voltage of one side with higher voltage in two sides of the loop closing point until the voltages in the two sides of the loop closing point meet the loop closing condition, wherein the loop closing and adjusting control device sends a loop closing instruction at the moment.
5. The method of claim 4, wherein the controlling the controllable inductor current and the reactive power absorbed by controlling the control angle of the triac to vary the loop-closing point voltage comprises:
according toAnd QL＝IL 2XLControlling the controllable inductor current and the reactive power absorbed, wherein:
ILeffective value of current flowing through the controllable inductor, QLFor reactive power absorbed by the controllable inductor, U is the effective value of the loop closing point voltage, XLFor inductor reactance, α is the control angle of the triac.
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| CN201811122962.9A CN109193920A (en) | 2018-09-26 | 2018-09-26 | A kind of cyclization tune electric control system and method based on controllable inductor |
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| CN201811122962.9A CN109193920A (en) | 2018-09-26 | 2018-09-26 | A kind of cyclization tune electric control system and method based on controllable inductor |
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| CN110994610A (en) * | 2019-12-24 | 2020-04-10 | 国网天津市电力公司 | Monitoring information assistance-based loop closing method and device for power distribution network line |
| CN111952970A (en) * | 2020-08-17 | 2020-11-17 | 云南电网有限责任公司电力科学研究院 | Power distribution network loop closing and power adjusting method and device |
| CN111952970B (en) * | 2020-08-17 | 2024-03-19 | 云南电网有限责任公司电力科学研究院 | Method and device for closing loop and regulating electricity of power distribution network |
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