CN108667035A - The method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control - Google Patents
The method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control Download PDFInfo
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- CN108667035A CN108667035A CN201810442537.1A CN201810442537A CN108667035A CN 108667035 A CN108667035 A CN 108667035A CN 201810442537 A CN201810442537 A CN 201810442537A CN 108667035 A CN108667035 A CN 108667035A
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- synchronous motor
- busbar
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention provides the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control, belongs to motor control technology field.This is included the following steps based on the method that synchronous motor Reactive-power control improves busbar short-circuit residual voltage：S1：When detecting electric system generation short trouble, synchronous motor carries out excitation to increase busbar voltage；S2：When the busbar voltage rises to preset voltage value, by the current regulation of synchronous motor to rated current.In the present invention when detecting electric system generation short trouble, synchronous motor carries out excitation to increase busbar voltage, when the busbar voltage rises to preset voltage value, by the current regulation of synchronous motor to rated current, busbar voltage improves that the speed to preset value is fast, and accuracy rate is high.
Description
Technical field
The invention belongs to motor control technology field, it is related to improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control
Method.
Background technology
In the operational process of electric system, short trouble can occur often.It is short when short trouble occurs for electric system
Short-circuit current value in the circuit of road greatly increases, while voltage in power grid can also be caused to reduce, or even is reduced to original voltage
60% -70%, as a result the power supply of certain customers may be made to be destroyed.In order to enable a system to work normally, weight analysis to draw
The reason of playing busbar voltage drop.
Substation is divided into three sections, and due to technological reason, is unable to mother, so every circuit is all to work independently.
But system is at runtime, is always inevitable and short trouble occurs.In normal operation, the busbar voltage of substation is kept
Near rated value.After short trouble occurs for substation, short circuit current increases sharply, and busbar voltage can be made to be reduced to originally
75% or even 70%, many unit trips of substation, system cisco unity malfunction can be caused in this way.
Invention content
The present invention existing above problem in view of the prior art, provides that improve busbar based on synchronous motor Reactive-power control short
The method of road residual voltage, the technical problem to be solved by the present invention is to：How to improve and improves busbar when short circuit occurs in electric system
Voltage.
Object of the invention can be realized by the following technical scheme：
Based on the method that synchronous motor Reactive-power control improves busbar short-circuit residual voltage, include the following steps：
S1：When detecting electric system generation short trouble, synchronous motor carries out excitation to increase busbar voltage；
S2：When the busbar voltage rises to preset voltage value, by the current regulation of synchronous motor to rated current.
Preferably, synchronous motor passes through permanent active power excitation in step S1.
Preferably, exciting current is provided by increasing the reactive power of motor to increase busbar for synchronous motor in step S1
Voltage.
Preferably, electricity is determined when increasing to default change rate by detecting the current changing rate in electric system in step S1
Short trouble occurs for Force system.
Preferably, when the current changing rate of electric system increases to default change rate in step S1, busbar voltage be less than it is pre-
If voltage value and short-circuit current rush coefficient, which become synchronous motor when 1, carries out excitation.
Preferably, it is specifically included in step S2：
S21：Detection busbar voltage rises to preset voltage value, is 0 by short-circuit current rush coefficient adjustment；
S22：By the current regulation of synchronous motor to rated current.
Preferably, further include to determine power train when increasing to pre-set current value by detecting the electric current in electric system
The short circuit current decision maker of short trouble occurs for system.
Preferably, step S21 includes detecting the voltage check device of busbar voltage and to be filled in voltage detecting
The recovery device for being 0 by short-circuit current rush coefficient adjustment is set when detection busbar voltage rises to preset voltage value.
Preferably, further include detecting the excitation voltage feedback device of busbar voltage and being filled to be fed back in excitation voltage
It sets detection busbar voltage and is less than preset voltage value to synchronous motor offer exciting current by increasing the reactive power of motor to increase
The excitation voltage setter of big busbar voltage.
Preferably, further include to the warning device alarmed when detecting electric system and short trouble occurring.
In the present invention detect electric system occur short trouble when, synchronous motor carry out excitation to increase busbar voltage,
When the busbar voltage rises to preset voltage value, by the current regulation of synchronous motor to rated current, busbar voltage improves
Speed to preset value is fast, and accuracy rate is high.
Description of the drawings
Fig. 1 is the flow diagram of the present invention.
Specific implementation mode
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Referring to Fig. 1, the method that busbar short-circuit residual voltage is improved based on synchronous motor Reactive-power control in the present embodiment, including
Following steps：
S1：When detecting electric system generation short trouble, synchronous motor carries out excitation to increase busbar voltage；
S2：When busbar voltage rises to preset voltage value, by the current regulation of synchronous motor to rated current.
Herein, power system reactive power balanced type is：Q∑=Q1-Qc-Qd, Q in formula∑For the total reactive power of system, Q1For line
The reactive power on road and resistance, QcFor the total reactive power of system capacitance, QdFor the reactive power of synchronous motor, electric system hair
When raw short trouble, QdAnd QcIt remains unchanged, and Q1It can then rise, lead to Q∑It is anxious to increase.The perunit value of voltage drop in electric system
Calculating formula is：△U%=（Q∑*X）/U2, △ U% are voltage drop in formula, and X is total reactance of system, generally reactance in the power system
Numerical value to be far longer than resistance, so the general influence for not considering Resistance versus voltage drop, U is real-time busbar voltage, voltage
Drop rises, and busbar voltage is caused to decline.When detecting electric system generation short trouble, short circuit current increases sharply, and can make mother
Line drop can cause many unit trips, system that cannot work normally, institute in this way as low as original 75% even 70%
To need to increase busbar voltage, excitation can be carried out to synchronous motor and realizes increase busbar voltage, ensures the normal of electric system
Stable operation, while the electric current of synchronous motor with excitation can increase.When carrying out excitation to synchronous motor, monitoring is female
The rising situation of line voltage can be by the current regulation of synchronous motor when detecting that busbar voltage rises to preset voltage value
It avoids continuing so that busbar voltage is more than preset voltage value to synchronous machinery excitation to rated current, saves electric energy, protect equipment
Normal operation.
Synchronous motor can pass through permanent active power excitation in step S1.Permanent active power excitation can make synchronous motor
Drag torque remains unchanged, and load does not also change, and the active power of such synchronous motor will not change.In electric power
When short circuit occurs for system, to synchronous motor using permanent active power excitation, the active power of synchronous motor will not change, together
The active power of step motor will not increased or decrease, and synchronous motor can be automatically increased electric current, both can be with automatic field forcing so that system
Reactive power rise, can thus make the voltage drop of system reduce so that the busbar voltage of system rises to default electric
Pressure value, accuracy rate are high.
Busbar electricity can be increased by increasing the reactive power of motor by providing exciting current in step S1 for synchronous motor
Pressure.When detecting electric system generation short trouble, exciting current is provided to the rotor of synchronous motor, peritrochanteric can incude
A D.C. magnetic field is generated, excitation is carried out to synchronous motor, the reactive power needed for it can be thus provided to synchronous motor,
Ensure the normal table operation of electric system.
Electric power is determined when can increase to default change rate by detecting the current changing rate in electric system in step S1
Short trouble occurs for system.The electric current flowed through when electric system normal operation in electric system is rated value or so, works as power train
System occur short trouble when, current value moment increase, at this moment can by calculate find out preset time internal short-circuit electric current most
Then big virtual value finds out the difference of maximum virtual value and rated value, thus can be with by finding out the derivative of time to difference
Find out the current changing rate of short circuit current, so that it may with by detect electric system in current changing rate, when current changing rate increase
It can determine that short trouble occurs for electric system when big extremely default change rate, default change rate can be a safety coefficient, behaviour
Make easy, accuracy rate height.
When the current changing rate of electric system increases to default change rate in step S1, busbar voltage be less than preset voltage value
Synchronous motor can carry out excitation when becoming 1 with short-circuit current rush coefficient.When short trouble occurs for electric system, short circuit electricity
Stream impact coefficient can become 1 from 0, and power value moment increases, and current changing rate will increase to default change rate, total idle of system
Power will increase, and the voltage drop of system will increase, then busbar voltage can be less than preset voltage value, at this time in order to protect equipment,
The stable operation of guarantee system, the reactive power for needing reduction system total are then subtracted by increasing the reactive power of synchronous motor
The total reactive power of mini system thus needs to carry out excitation to synchronous motor, and easy to operate, accuracy rate is high.
It can be specifically included in step S2：
S21：Detection busbar voltage rises to preset voltage value, can be 0 by short-circuit current rush coefficient adjustment；
S22：It can be by the current regulation of synchronous motor to rated current.
Herein, to synchronous motor carry out excitation when, need monitor busbar voltage rising situation, when detect busbar electricity
When pressure rises to preset voltage value, it can be 0 by short-circuit current rush coefficient adjustment, ensure the stable operation of system, can incite somebody to action
The current regulation of synchronous motor to rated current avoids continuing so that busbar voltage is more than preset voltage value to synchronous machinery excitation,
Electric energy is saved, the normal operation of equipment is protected.
Can also include using as the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control in the present invention
To determine that the short circuit electricity of short trouble occurs for electric system when increasing to pre-set current value by detecting the electric current in electric system
Flow decision maker.The electric current in electric system can thus be detected in real time by short circuit current decision maker, increased in electric current
To just can determine electric system generation short trouble when pre-set current value, the current value accuracy detected in this way is high, convenient for certainly
Dynamicization operates, and helps to judge whether electric system occurs short trouble.
May include detecting the voltage check device of busbar voltage and to be examined in voltage check device in step S21
The recovery device for being 0 by short-circuit current rush coefficient adjustment is surveyed when busbar voltage rises to preset voltage value.Can thus it lead to
Zenith tracking device detects the busbar voltage in electric system in real time, when detecting that busbar voltage rises to preset voltage value
When, can by recovery device by short-circuit current rush coefficient adjustment be 0, ensure the stable operation of system.
Can also include using as the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control in the present invention
It is preset to detect the excitation voltage feedback device of busbar voltage and to be less than in excitation voltage feedback device detection busbar voltage
Voltage value provides exciting current to synchronous motor and increases the excitation electricity of busbar voltage by increasing the reactive power of synchronous motor
Press setter.Thus it can work as excitation voltage by the busbar voltage in excitation voltage feedback device real-time electric power system
Feedback device detects provides excitation by excitation voltage setter when busbar voltage is less than preset voltage value to synchronous motor
Electric current can increase the reactive power of synchronous motor, can thus reduce the voltage drop in electric system, increase busbar electricity
Pressure, ensures the safe operation of equipment, ensures the stable operation of system.
Can also include using as the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control in the present invention
With the warning device alarmed when detecting electric system and short trouble occurring.Warning device can determine electric power in this way
System occurs to alarm to user when short trouble, does not carry out increase mother after avoiding system that short trouble occurs in long-time
Line voltage causes to damage equipment, destroys the stable operation of system.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control, which is characterized in that include the following steps：
S1：When detecting electric system generation short trouble, synchronous motor carries out excitation to increase busbar voltage；
S2：When the busbar voltage rises to preset voltage value, by the current regulation of synchronous motor to rated current.
2. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as described in claim 1, it is characterised in that：
Synchronous motor passes through permanent active power excitation in step S1.
3. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as described in claim 1, it is characterised in that：
Exciting current is provided by increasing the reactive power of motor to increase busbar voltage for synchronous motor in step S1.
4. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as claimed in claim 1 or 2, feature exist
In：It is short to determine that electric system occurs when increasing to default change rate by detecting the current changing rate in electric system in step S1
Road failure.
5. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as claimed in claim 1 or 2, feature exist
In：When the current changing rate of electric system increases to default change rate in step S1, busbar voltage be less than preset voltage value and short
Road rush of current coefficient becomes synchronous motor when 1 and carries out excitation.
6. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as claimed in claim 1 or 2, feature exist
In being specifically included in step S2：
S21：Detection busbar voltage rises to preset voltage value, is 0 by short-circuit current rush coefficient adjustment；
S22：By the current regulation of synchronous motor to rated current.
7. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as claimed in claim 1 or 2, feature exist
In：Further include to determine that short circuit event occurs for electric system when increasing to pre-set current value by detecting the electric current in electric system
The short circuit current decision maker of barrier.
8. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as claimed in claim 6, it is characterised in that：
Step S21 includes detecting the voltage check device of busbar voltage and in voltage check device detection busbar voltage
The recovery device for being 0 by short-circuit current rush coefficient adjustment when rising to preset voltage value.
9. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as claimed in claim 1 or 2, feature exist
In：Further include detecting the excitation voltage feedback device of busbar voltage and in excitation voltage feedback device detection busbar electricity
Pressure is less than preset voltage value and provides exciting current by the reactive power of increase synchronous motor to synchronous motor to increase busbar electricity
The excitation voltage setter of pressure.
10. the method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control as claimed in claim 1 or 2, feature
It is：It further include the warning device to alarm when detecting electric system and short trouble occurring.
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| CN201810442537.1A CN108667035A (en) | 2018-05-10 | 2018-05-10 | The method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control |
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| CN201810442537.1A CN108667035A (en) | 2018-05-10 | 2018-05-10 | The method for improving busbar short-circuit residual voltage based on synchronous motor Reactive-power control |
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|---|---|---|---|---|
| US20060267560A1 (en) * | 2005-05-24 | 2006-11-30 | Janos Rajda | Device, system, and method for providing a low-voltage fault ride-through for a wind generator farm |
| CN103795090A (en) * | 2014-01-29 | 2014-05-14 | 广东电网公司电力科学研究院 | Electric generator reactive power output emergency control method based on wide area measurement system |
| CN103915860A (en) * | 2014-03-03 | 2014-07-09 | 广东电网公司电力科学研究院 | Reactive power control method for electric generator |
| CN104849661A (en) * | 2015-05-21 | 2015-08-19 | 中国大唐集团科学技术研究院有限公司华东分公司 | Method for testing capability of synchronous generator in adjusting voltage of main transformer high-voltage side bus |
| CN106410814A (en) * | 2016-05-20 | 2017-02-15 | 中国大唐集团科学技术研究院有限公司华东分公司 | Method of adjusting voltage of station service working bus of power plant through synchronous motor |
| CN106786632A (en) * | 2017-03-17 | 2017-05-31 | 广东电网有限责任公司电力科学研究院 | Generator reactive based on local voltage signal is exerted oneself emergency control method and device |
-
2018
- 2018-05-10 CN CN201810442537.1A patent/CN108667035A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060267560A1 (en) * | 2005-05-24 | 2006-11-30 | Janos Rajda | Device, system, and method for providing a low-voltage fault ride-through for a wind generator farm |
| CN103795090A (en) * | 2014-01-29 | 2014-05-14 | 广东电网公司电力科学研究院 | Electric generator reactive power output emergency control method based on wide area measurement system |
| CN103915860A (en) * | 2014-03-03 | 2014-07-09 | 广东电网公司电力科学研究院 | Reactive power control method for electric generator |
| CN104849661A (en) * | 2015-05-21 | 2015-08-19 | 中国大唐集团科学技术研究院有限公司华东分公司 | Method for testing capability of synchronous generator in adjusting voltage of main transformer high-voltage side bus |
| CN106410814A (en) * | 2016-05-20 | 2017-02-15 | 中国大唐集团科学技术研究院有限公司华东分公司 | Method of adjusting voltage of station service working bus of power plant through synchronous motor |
| CN106786632A (en) * | 2017-03-17 | 2017-05-31 | 广东电网有限责任公司电力科学研究院 | Generator reactive based on local voltage signal is exerted oneself emergency control method and device |
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Application publication date: 20181016 Assignee: Wuhan Sidi Shangen Technology Co., Ltd Assignor: WUHAN University OF SCIENCE AND TECHNOLOGY Contract record no.: X2020420000005 Denomination of invention: Method of improving bus short circuit residual voltage based on reactive power regulation of synchronous motor License type: Common License Record date: 20201021 |
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