CN105140925A - Electric power system automatic voltage control method and device - Google Patents
Electric power system automatic voltage control method and device Download PDFInfo
- Publication number
- CN105140925A CN105140925A CN201510432095.9A CN201510432095A CN105140925A CN 105140925 A CN105140925 A CN 105140925A CN 201510432095 A CN201510432095 A CN 201510432095A CN 105140925 A CN105140925 A CN 105140925A
- Authority
- CN
- China
- Prior art keywords
- voltage
- control
- idle
- limit
- automatism
- 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.)
- Pending
Links
Classifications
-
- 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
Abstract
The invention relates to an electric power system automatic voltage control method and device. Machine set port voltage and main network voltage are enabled to change within an allowable range by adopting an automatic voltage device for adjustment of a power station and a transformer substation so that stable operation of an electric network system can be guaranteed and normal operation of electric power equipment can be guaranteed.
Description
Technical field
The present invention relates to a kind of technical field of automatic control of power system stability, specifically, is a kind of method for automatic controlling voltage of electrical power and device.
Background technology
The same with frequency, voltage is also one of important indicator of the quality of power supply.Quality of voltage runs power system stability, reduces line loss, ensures industry and agricultural production security, improves the quality of products, and reduces electricity loss etc. and all has a direct impact.Cause the main because of rope of voltage fluctuation; one is the change of user's load or burden without work; such as; peak load and low ebb load: two is the changes of reactive power flow in electrical network; as start and the change of shutting down the reactive power flow caused in electrical network of generating set, in these cases, when there is no enough reactive power sources and regulator in electric power system; large voltage fluctuation and skew can be produced, even occur low-voltage and high voltage running status.The operation characteristic of change to user of voltage has a significant impact.Overtension is too low has adverse influence to user and electric power system, therefore, in order to ensure the normal work of electric equipment, must carry out supervision and the adjustment of system voltage in power system operation, to ensure that variation is within permission excursion.
Summary of the invention
Based on the deficiency that prior art exists, the present invention proposes a kind of method for automatic controlling voltage of electrical power and device, control method is controlled by power plant and Substation control realizes automatism voltage control, and the voltage control in power plant adopts the method based on field regulator controller terminal voltage.When exciting current changes, generator idle is exerted oneself and also to be increased and decreased with set end voltage thereupon, and the height of busbar voltage is had influence on further by machine end transformer, the increase and decrease of exciting current realizes by changing field regulator (AVR) set-point.Namely be that the actual terminal voltage of generator and the deviation signal of set-point are inputted field regulator, thus the exciting current of regulator generator, controller terminal voltage is set point.
In automatic voltage control system, the high voltage bus magnitude of voltage that the automatism voltage control in power plant issues according to master station compares with the high voltage bus value measured in real time, and the voltage variety is relatively flowed to automatic excitation regulator (AVR), then AVR conventionally controls generator terminal voltage again, and then reaches the object controlling high voltage bus voltage.Therefore, the control objectives of power plant automatism voltage control makes high voltage bus voltage reach the value of setting or the scope of setting, realizes large closed-loop adjustment by the given of field regulator to busbar voltage.
Power plant adopts unit connection mode that generator is connected to bus through step-up transformer, in being incorporated into the power networks, sending out and does not have absolute linear relationship between voltage and high voltage bus voltage, in performance objective tracing process, adopts the control method of Approach by inchmeal.
Power plant automatism voltage control is coordinated the idle of each unit in factory according to the given voltage of master station's automatism voltage control and is exerted oneself, and makes to occur voltage stable operation in given voltage.
Power plant automatism voltage control is control step-up transformer high voltage bus voltage constant or is target in certain scope, to reach the object improving the stability of a system.
X
efor generator is to the reactance of electric power system, X
e=X
l+ X
t, X
d ∑=X
d+ X
e, the target of power plant automatism voltage control is V
hconstant or change in certain scope: V
h=V
t-I
qx
t, wherein: I
qit is the reactive current that generator sends.
As system voltage V
sduring decline, V
h-V
sdifference become large, thus reactive current Q increases, i.e. V
t=V
h+ I
qx
t, thus set end voltage V can be drawn
tincrease, namely increase the idle of generator and exert oneself, maintain the stable of system voltage.
In systems in which, stability limit is:
001"/>
In formula: E'
qfor generator q axle transient potential, X'
dfor the reactance of generator d axle transient state, V
tfor generator terminal voltage, X
tfor step-up transformer reactance, V
hfor step-up transformer high side voltage, X
ltransmission line reactance, V
sfor system voltage.
Power plant automatism voltage control regulates the size of exciting current by the input controlling field regulator, thus control the height of generator terminal voltage, to reach the object indirectly controlling high voltage bus voltage, in the scope that namely power plant automatism voltage control can allow at generator, improve E'
q, thus make P
maximprove, namely improve the stability limit of system, and then improve delivery of electrical energy ability.
Concrete control method is as follows:
Power plant's automatism voltage control is the voltage designated value U sent from remote dispatching
zthe voltage U measured from bus with power plant itself
mcompare, work as U
z> U
mtime, carry out the operation of increase excitation, increase in excitation process and consider to increase the relevant constrained of excitation, increase excitation until U
mclose to U
zin time, stops; Work as U
z< U
mtime, carry out the operation of minimizing excitation, reduce excitation process and will consider equally to reduce the possible various limiting factors of excitation, until U
mclose to U
zin time, stops reducing excitation.In increase (or minimizing) process, as long as there is a variable to reach constrained, then stop immediately increasing (or minimizing) operation.
The RTU of power plant is the message switch point of master station's automatism voltage control and power plant's automatism voltage control, and the regulating and controlling voltage information of master station's automatism voltage control is delivered to power plant through this, and the operation information of power plant's automatism voltage control feeds back to center through this.The information that master station's automatism voltage control issues is digital quantity and switching value, if only there is voltage value there is no numerical signal, can not accept by power plant's automatism voltage control execution.And power plant's automatism voltage control feeds back to master station is switching value, it has three kinds of states, namely whether accepts master station's automatism voltage control state, whether allows lifting voltage or reduce voltage-operated, by U
zwith U
mcompare, thus Δ U can be drawn.Need to judge, if | Δ U| < Δ U
mincan not adjust, if | Δ U| > Δ U
max, also do not adjust, when judging Δ U
min< | Δ U| < Δ U
max, then judge further, if | Δ U| > 0, then carry out the operation increasing excitation, if | Δ U| < 0, then carry out the operation reducing excitation.
Increase or reduce the idle requirement needs making working voltage meet command value to reach through the operation repeatedly increasing excitation or minimizing excitation, make working voltage progressively close to command value.In the process that this is progressively close, each step all compares with the related constraint of unit, once there be operational factor to reach certain constrained, stop idle adjustment at once, and send can not increase or reduce idle warning information to master station's automatism voltage control.Master station's automatism voltage control after receiving warning information, then maintains given voltage before this, can not assign new given voltage again toward the direction of alarm.Power plant's automatism voltage control makes power plant's line voltage maintain designated value position all the time.
Reasonable and main line voltage optimization that Substation control comprises that busbar voltage is qualified, main transformer is idle.
The control mode of busbar voltage is as follows:
1) when high side bus voltage is out-of-limit, eliminate out-of-limit by switching reactive apparatus.
2) if the situation of voltage out-of-limit appears in the bus of other high priorities after switching reactive apparatus, then main transformer is first regulated separately, after mesolow side bus voltage is regulated, then switching reactive apparatus.
3) low-pressure side bus voltage out-of-limit in the middle of, adopts following rule to control:
If a) mesolow side is consistent with high voltage regulation direction, then preferential switching reactive apparatus, if reactive apparatus can not switching, then regulates separately.Mesolow side is consistent with high voltage regulation direction to be referred to: mesolow side Over High-Limit Voltage simultaneously high side voltage higher (close to or exceed the upper limit); Mesolow side voltage gets over lower limit high side voltage (being near or below lower limit) on the low side simultaneously.
If b) mesolow side and high voltage regulation direction inconsistent, then continue to judge according to the idle situation in critical point, high-pressure side:
If high-pressure side is idle rationally, then preferentially regulate separately, as separately non-adjustable, then switching reactive apparatus.
If it is unreasonable that high-pressure side is idle, and idle adjustment direction is consistent with mesolow side voltage, then preferential switching reactive apparatus, if reactive apparatus can not switching, then regulates separately.
If it is unreasonable that high-pressure side is idle, and idle adjustment direction and mesolow side voltage inconsistent, preferentially regulate separately, as separately non-adjustable, then switching reactive apparatus.
The adjustment direction that high-pressure side is idle is consistent with voltage-regulation direction, mesolow side to be referred to: mesolow side Over High-Limit Voltage simultaneously high-pressure side reactive power releasing or power factor gets over the upper limit; Mesolow side voltage is lower limit high-pressure side power factor more lower limit simultaneously more.
The control mode that main transformer is idle is as follows:
When voltage is qualified, judge whether control unit main transformer high-pressure side is idle qualified.Be specially:
1) if high-pressure side reactive power releasing: switching reactive apparatus corrects.
2) consider the error of idle measurement, the criterion of current reactive power releasing is that main transformer idle measurement in high-pressure side is less than error threshold.
During control that main transformer is idle, the qualified of busbar voltage should be ensured.
The control mode that main line voltage is optimized is as follows:
When voltage qualified and idle qualified, consider on high-tension side voltage optimization strategy.On high-tension side optimization voltage setting value adopts overall idle work optimization to calculate the voltage setting value provided,
Concrete is:
1) when high side bus voltage is more higher than Optimal Setting value, switching reactive apparatus regulates.
2) when high side bus voltage is more on the low side than Optimal Setting value, switching reactive apparatus regulates.
When high side bus voltage departs from Optimal Setting value, refer to that the deviation of the relative Optimal Setting value of current voltage measuring value has exceeded voltage optimization dead band, this dead band is an adjustable controling parameters.
When main line voltage is optimized, should ensure that busbar voltage is qualified and main transformer is rationally idle.
Automatism voltage control device comprises four modules: data processing module, logic judgment module, Corrective control module, human-computer interface module
Data processing module comprises the real-time update of human-computer dialogue data, the collection of real-time stream and refreshing and various block signal, the refreshing of guard signal and the information feed back of process and automatic voltage control system control decision process.
Data needed for automatic voltage control system voltage & reactive power-control comprise dynamic and static state two class.Wherein dynamic base is mainly used to deposit the various data messages that automatic voltage control system Real-time Collection monitors, and as the various SOE such as remote signalling, real-time telemetry, guard signal of switch tool, real time data obtains from SCADA system.Static library mainly leaves in the day-to-day operation of electrical network the data not needing often change in, as: the parameter of various equipment and the bound definite value etc. of automatic voltage control system defined.
Data processing module is the basis that other modules carry out judging to calculate, and its requires to ensure that real time data used by native system can refresh come from the correct reading of SCADA system.
Logic judgment module processes the data gathered, and due to data processing module, to read the data message amount such as remote signalling, remote measurement that obtains very large, while the quality of voltage of mainly power system operation focused on of automatic voltage control system and the economy of operation.Therefore, by the voltage of each voltage monitoring point is incorporated in logic judgment module, the data burden of system Real-Time Monitoring can be reduced greatly, make automatic voltage control system mainly be devoted to how to improve the rate of qualified voltage of each node in electrical network, only just remaining real time data information is incorporated in database when system is optimized calculating.Meanwhile, in order to prevent causing optimal control action frequently because of voltage flicker, the collection period of certain data is set.If voltage is still out-of-limit, then correct out-of-limit, at this moment adopted data get the mean value in monitoring time section.
Automatic voltage control system constantly obtains real time data from SCADA with certain cycle, determines next step action according to the result of logic judgment module.If voltage detecting normally, then needs the whether own change enough large through generation such as generating, load judging system, whether the operational mode that namely system is current departs from a mode optimizing the calculating moment own through enough far away.If so, then re-start idle work optimization according to optimized algorithm to current way and calculate, under judgement current operating conditions, the reactive power of tap gear number and each reactive source exports and Capacitor banks input amount.
The deterministic process of logic judgment module, based on the side-play amount of the mode of connection of system, load, accurately can either reflect the change of running status, responsive not too much again, prevents the frequent movement of the Reactive-power control equipment caused because frequently carrying out calculating.
If automatic voltage control system monitors there is voltage out-of-limit situation, then enter Corrective control module to carry out the out-of-limit correction of voltage.The out-of-limit correction of voltage adopts and controls on the spot and cooperation control and carrying out for optimization aim so that control action is minimum in conjunction with sensitivity analysis.By computational analysis, determine the throwing of capacitor according to current busbar voltage and power factor, cut adjustment.By adopting the result of sensitivity analysis quasi real time, carrying out aid decision, according to the size controlling effect, effective voltage correction strategy being ranked.In addition, also need the restriction of the action frequency considering control appliance, pro rata size is shared the Corrective control of out-of-limit voltage jointly by each effective control appliance.
Simultaneously, the Corrective control strategy that obtains can also be utilized to carry out comprehensively comprehensively comparing from aspects such as the validity of the number of times of device action, Corrective control and the kinds of control appliance that relates to respectively, select the simplest the most effectively, the action scheme of most coordinated operation is as final voltage corrective control scheme.
Corrective control module reads the control strategy generated in logic judgment module, after having carried out the verification of some legitimacies, perform the control strategy of generation, also need to analyze the result of Corrective control, for Corrective control next time provides information and output journal, with the execution ensureing that Corrective control strategy can be correct.Mainly comprise:
(1) Corrective control interface
A, reading automatism voltage control Logic judgment result.
B, reading idle work optimization result.
C, reading scheduling or manual adjustment instruction.
(2) Corrective control
Be connected with other Processing Interface, add some verification measures,
(3) daily record exports
Log complete in detail, have recorded as returned to school, performing, remote control, remote regulating is preset, overtime, cancels and the operational circumstances such as tripping.
Human-computer interface module is used to finishing man-machine interaction function.Human-computer interface module is integrated with and arranges amendment Static and dynamic parameter online, show the layering of real-time monitor message, inquiry prints the log information of statistics, the display of real-time issues and audio alert with the process of remote control remote regulating and etc. function.Meanwhile, human-computer interface module also needs to ensure the close friend at automatic voltage control system interface, the easy to operate function such as simply.
By adopting automatic voltage device to the adjustment of power plant and transformer station, thus unit port voltage and major network voltage are changed in allowed limits, thus ensure that the stable operation of network system, the normal operation of the power equipment of guarantee.
Accompanying drawing explanation
Fig. 1 is the operating process of electric power system automatism voltage control device of the present invention.
Embodiment
A kind of method for automatic controlling voltage of electrical power and device, control method is controlled by power plant and Substation control realizes automatism voltage control, and the voltage control in power plant adopts the method based on field regulator controller terminal voltage.When exciting current changes, generator idle is exerted oneself and also to be increased and decreased with set end voltage thereupon, and the height of busbar voltage is had influence on further by machine end transformer, the increase and decrease of exciting current realizes by changing field regulator (AVR) set-point.Namely be that the actual terminal voltage of generator and the deviation signal of set-point are inputted field regulator, thus the exciting current of regulator generator, controller terminal voltage is set point.
In automatic voltage control system, the high voltage bus magnitude of voltage that the automatism voltage control in power plant issues according to master station compares with the high voltage bus value measured in real time, and the voltage variety is relatively flowed to automatic excitation regulator (AVR), then AVR conventionally controls generator terminal voltage again, and then reaches the object controlling high voltage bus voltage.Therefore, the control objectives of power plant automatism voltage control makes high voltage bus voltage reach the value of setting or the scope of setting, realizes large closed-loop adjustment by the given of field regulator to busbar voltage.
Power plant adopts unit connection mode that generator is connected to bus through step-up transformer, in being incorporated into the power networks, sending out and does not have absolute linear relationship between voltage and high voltage bus voltage, in performance objective tracing process, adopts the control method of Approach by inchmeal.
Power plant automatism voltage control is coordinated the idle of each unit in factory according to the given voltage of master station's automatism voltage control and is exerted oneself, and makes to occur voltage stable operation in given voltage.
Power plant automatism voltage control is control step-up transformer high voltage bus voltage constant or is target in certain scope, to reach the object improving the stability of a system.
X
efor generator is to the reactance of electric power system, X
e=X
l+ X
t, X
d ∑=X
d+ X
e, the target of power plant automatism voltage control is V
hconstant or change in certain scope: V
h=V
t-I
qx
t, wherein: I
qit is the reactive current that generator sends.
As system voltage V
sduring decline, V
h-V
sdifference become large, thus reactive current Q increases, i.e. V
t=V
h+ I
qx
t, thus set end voltage V can be drawn
tincrease, namely increase the idle of generator and exert oneself, maintain the stable of system voltage.
In systems in which, stability limit is:
002"/>
In formula: E'
qfor generator q axle transient potential, X'
dfor the reactance of generator d axle transient state, V
tfor generator terminal voltage, X
tfor step-up transformer reactance, V
hfor step-up transformer high side voltage, X
ltransmission line reactance, V
sfor system voltage.
Power plant automatism voltage control regulates the size of exciting current by the input controlling field regulator, thus control the height of generator terminal voltage, to reach the object indirectly controlling high voltage bus voltage, in the scope that namely power plant automatism voltage control can allow at generator, improve E'
q, thus make P
maximprove, namely improve the stability limit of system, and then improve delivery of electrical energy ability.
Concrete control method is as follows:
Power plant's automatism voltage control is the voltage designated value U sent from remote dispatching
zthe voltage U measured from bus with power plant itself
mcompare, work as U
z> U
mtime, carry out the operation of increase excitation, increase in excitation process and consider to increase the relevant constrained of excitation, increase excitation until U
mclose to U
zin time, stops; Work as U
z< U
mtime, carry out the operation of minimizing excitation, reduce excitation process and will consider equally to reduce the possible various limiting factors of excitation, until U
mclose to U
zin time, stops reducing excitation.In increase (or minimizing) process, as long as there is a variable to reach constrained, then stop immediately increasing (or minimizing) operation.
The RTU of power plant is the message switch point of master station's automatism voltage control and power plant's automatism voltage control, and the regulating and controlling voltage information of master station's automatism voltage control is delivered to power plant through this, and the operation information of power plant's automatism voltage control feeds back to center through this.The information that master station's automatism voltage control issues is digital quantity and switching value, if only there is voltage value there is no numerical signal, can not accept by power plant's automatism voltage control execution.And power plant's automatism voltage control feeds back to master station is switching value, it has three kinds of states, namely whether accepts master station's automatism voltage control state, whether allows lifting voltage or reduce voltage-operated, by U
zwith U
mcompare, thus Δ U can be drawn.Need to judge, if | Δ U| < Δ U
mincan not adjust, if | Δ U| > Δ U
max, also do not adjust, when judging Δ U
min< | Δ U| < Δ U
max, then judge further, if | Δ U| > 0, then carry out the operation increasing excitation, if | Δ U| < 0, then carry out the operation reducing excitation.
Increase or reduce the idle requirement needs making working voltage meet command value to reach through the operation repeatedly increasing excitation or minimizing excitation, make working voltage progressively close to command value.In the process that this is progressively close, each step all compares with the related constraint of unit, once there be operational factor to reach certain constrained, stop idle adjustment at once, and send can not increase or reduce idle warning information to master station's automatism voltage control.Master station's automatism voltage control after receiving warning information, then maintains given voltage before this, can not assign new given voltage again toward the direction of alarm.Power plant's automatism voltage control makes power plant's line voltage maintain designated value position all the time.
Reasonable and main line voltage optimization that Substation control comprises that busbar voltage is qualified, main transformer is idle.
The control mode of busbar voltage is as follows:
1) when high side bus voltage is out-of-limit, eliminate out-of-limit by switching reactive apparatus.
2) if the situation of voltage out-of-limit appears in the bus of other high priorities after switching reactive apparatus, then main transformer is first regulated separately, after mesolow side bus voltage is regulated, then switching reactive apparatus.
3) low-pressure side bus voltage out-of-limit in the middle of, adopts following rule to control:
If a) mesolow side is consistent with high voltage regulation direction, then preferential switching reactive apparatus, if reactive apparatus can not switching, then regulates separately.Mesolow side is consistent with high voltage regulation direction to be referred to: mesolow side Over High-Limit Voltage simultaneously high side voltage higher (close to or exceed the upper limit); Mesolow side voltage gets over lower limit high side voltage (being near or below lower limit) on the low side simultaneously.
If b) mesolow side and high voltage regulation direction inconsistent, then continue to judge according to the idle situation in critical point, high-pressure side:
If high-pressure side is idle rationally, then preferentially regulate separately, as separately non-adjustable, then switching reactive apparatus.
If it is unreasonable that high-pressure side is idle, and idle adjustment direction is consistent with mesolow side voltage, then preferential switching reactive apparatus, if reactive apparatus can not switching, then regulates separately.
If it is unreasonable that high-pressure side is idle, and idle adjustment direction and mesolow side voltage inconsistent, preferentially regulate separately, as separately non-adjustable, then switching reactive apparatus.
The adjustment direction that high-pressure side is idle is consistent with voltage-regulation direction, mesolow side to be referred to: mesolow side Over High-Limit Voltage simultaneously high-pressure side reactive power releasing or power factor gets over the upper limit; Mesolow side voltage is lower limit high-pressure side power factor more lower limit simultaneously more.
The control mode that main transformer is idle is as follows:
When voltage is qualified, judge whether control unit main transformer high-pressure side is idle qualified.Be specially:
1) if high-pressure side reactive power releasing: switching reactive apparatus corrects.
2) consider the error of idle measurement, the criterion of current reactive power releasing is that main transformer idle measurement in high-pressure side is less than error threshold.
During control that main transformer is idle, the qualified of busbar voltage should be ensured.
The control mode that main line voltage is optimized is as follows:
When voltage qualified and idle qualified, consider on high-tension side voltage optimization strategy.On high-tension side optimization voltage setting value adopts overall idle work optimization to calculate the voltage setting value provided, and concrete is:
1) when high side bus voltage is more higher than Optimal Setting value, switching reactive apparatus regulates.
2) when high side bus voltage is more on the low side than Optimal Setting value, switching reactive apparatus regulates.
When high side bus voltage departs from Optimal Setting value, refer to that the deviation of the relative Optimal Setting value of current voltage measuring value has exceeded voltage optimization dead band, this dead band is an adjustable controling parameters.
When main line voltage is optimized, should ensure that busbar voltage is qualified and main transformer is rationally idle.
Automatism voltage control device comprises four modules: data processing module, logic judgment module, Corrective control module, human-computer interface module.
Data processing module comprises the real-time update of human-computer dialogue data, the collection of real-time stream and refreshing and various block signal, the refreshing of guard signal and the information feed back of process and automatic voltage control system control decision process.
Data needed for automatic voltage control system voltage & reactive power-control comprise dynamic and static state two class.Wherein dynamic base is mainly used to deposit the various data messages that automatic voltage control system Real-time Collection monitors, and as the various SOE such as remote signalling, real-time telemetry, guard signal of switch tool, real time data obtains from SCADA system.Static library mainly leaves in the day-to-day operation of electrical network the data not needing often change in, as: the parameter of various equipment and the bound definite value etc. of automatic voltage control system defined.
Data processing module is the basis that other modules carry out judging to calculate, and its requires to ensure that real time data used by native system can refresh come from the correct reading of SCADA system.
Logic judgment module processes the data gathered, and due to data processing module, to read the data message amount such as remote signalling, remote measurement that obtains very large, while the quality of voltage of mainly power system operation focused on of automatic voltage control system and the economy of operation.Therefore, by the voltage of each voltage monitoring point is incorporated in logic judgment module, the data burden of system Real-Time Monitoring can be reduced greatly, make automatic voltage control system mainly be devoted to how to improve the rate of qualified voltage of each node in electrical network, only just remaining real time data information is incorporated in database when system is optimized calculating.Meanwhile, in order to prevent causing optimal control action frequently because of voltage flicker, the collection period of certain data is set.If voltage is still out-of-limit, then correct out-of-limit, at this moment adopted data get the mean value in monitoring time section.
Automatic voltage control system constantly obtains real time data from SCADA with certain cycle, determines next step action according to the result of logic judgment module.If voltage detecting normally, then needs the whether own change enough large through generation such as generating, load judging system, whether the operational mode that namely system is current departs from a mode optimizing the calculating moment own through enough far away.If so, then re-start idle work optimization according to optimized algorithm to current way and calculate, under judgement current operating conditions, the reactive power of tap gear number and each reactive source exports and Capacitor banks input amount.
The deterministic process of logic judgment module, based on the side-play amount of the mode of connection of system, load, accurately can either reflect the change of running status, responsive not too much again, prevents the frequent movement of the Reactive-power control equipment caused because frequently carrying out calculating.
If automatic voltage control system monitors there is voltage out-of-limit situation, then enter Corrective control module to carry out the out-of-limit correction of voltage.The out-of-limit correction of voltage adopts and controls on the spot and cooperation control and carrying out for optimization aim so that control action is minimum in conjunction with sensitivity analysis.By computational analysis, determine the throwing of capacitor according to current busbar voltage and power factor, cut adjustment.By adopting the result of sensitivity analysis quasi real time, carrying out aid decision, according to the size controlling effect, effective voltage correction strategy being ranked.In addition, also need the restriction of the action frequency considering control appliance, pro rata size is shared the Corrective control of out-of-limit voltage jointly by each effective control appliance.
Simultaneously, the Corrective control strategy that obtains can also be utilized to carry out comprehensively comprehensively comparing from aspects such as the validity of the number of times of device action, Corrective control and the kinds of control appliance that relates to respectively, select the simplest the most effectively, the action scheme of most coordinated operation is as final voltage corrective control scheme.
Corrective control module reads the control strategy generated in logic judgment module, after having carried out the verification of some legitimacies, perform the control strategy of generation, also need to analyze the result of Corrective control, for Corrective control next time provides information and output journal, with the execution ensureing that Corrective control strategy can be correct.Mainly comprise:
(1) Corrective control interface
A, reading automatism voltage control Logic judgment result.
B, reading idle work optimization result.
C, reading scheduling or manual adjustment instruction.
(2) Corrective control
Be connected with other Processing Interface, add some verification measures,
(3) daily record exports
Log complete in detail, have recorded as returned to school, performing, remote control, remote regulating is preset, overtime, cancels and the operational circumstances such as tripping.
Human-computer interface module is used to finishing man-machine interaction function.Human-computer interface module is integrated with and arranges amendment Static and dynamic parameter online, show the layering of real-time monitor message, inquiry prints the log information of statistics, the display of real-time issues and audio alert with the process of remote control remote regulating and etc. function.Meanwhile, human-computer interface module also needs to ensure the close friend at automatic voltage control system interface, the easy to operate function such as simply.
By adopting automatic voltage device to the adjustment of power plant and transformer station, thus unit port voltage and major network voltage are changed in allowed limits, thus ensure that the stable operation of network system, the normal operation of the power equipment of guarantee.
The foregoing is only of the present invention and be preferably not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a method for automatic controlling voltage of electrical power, is characterized in that, described method is controlled by power plant and Substation control realizes automatism voltage control.
2. method for automatic controlling voltage of electrical power as claimed in claim 1, is characterized in that, the automatism voltage control in power plant adopts based on field regulator controller terminal voltage, X
efor generator is to the reactance of electric power system; X
e=X
l+ X
t, X
d Σ=X
d+ X
e, the target of power plant automatism voltage control is V
hconstant: V
h=V
t-I
qx
t, wherein: I
qit is the reactive current that generator sends;
As system voltage V
sduring decline, V
h-V
sdifference become large, thus reactive current Q increases, i.e. V
t=V
h+ I
qx
t, thus draw set end voltage V
tincrease, namely increase the idle of generator and exert oneself, maintain the stable of system voltage;
In systems in which, stability limit is:
In formula: E'
qfor generator q axle transient potential, X'
dfor the reactance of generator d axle transient state, V
tfor generator terminal voltage, X
tfor step-up transformer reactance, V
hfor step-up transformer high side voltage, X
ltransmission line reactance, V
sfor system voltage;
Power plant automatism voltage control regulates the size of exciting current by the input controlling field regulator, thus controls generator terminal voltage, to control high voltage bus voltage.
3. method for automatic controlling voltage of electrical power as claimed in claim 2, it is characterized in that, the regulating and controlling voltage information of master station's automatism voltage control is delivered to power plant through the RTU of power plant, and the operation information of power plant's automatism voltage control feeds back to center, by U through the RTU of power plant
zwith U
mcompare, draw Δ U, if | Δ U| < Δ U
mindo not adjust, if | Δ U| > Δ U
max, also do not adjust, when judging Δ U
min< | Δ U| < Δ U
max, then judge further, if | Δ U| > 0, then carry out the operation increasing excitation, increase excitation until U
mclose to U
zin time, stops, if | Δ U| < 0, then carry out the operation reducing excitation, until U
mclose to U
zin time, stops reducing excitation.
4. method for automatic controlling voltage of electrical power as claimed in claim 3, is characterized in that, reasonable and main line voltage optimization that Substation control comprises that busbar voltage is qualified, main transformer is idle.
5. method for automatic controlling voltage of electrical power as claimed in claim 4, it is characterized in that, the control mode of busbar voltage is as follows:
1) when high side bus voltage is out-of-limit, eliminate out-of-limit by switching reactive apparatus;
2) if the situation of voltage out-of-limit appears in the bus of other high priorities after switching reactive apparatus, then main transformer is first regulated separately, after mesolow side bus voltage is regulated, then switching reactive apparatus;
3) low-pressure side bus voltage out-of-limit in the middle of, adopts following rule to control;
If a) mesolow side is consistent with high voltage regulation direction, then preferential switching reactive apparatus, if reactive apparatus can not switching, then regulate separately, mesolow side is consistent with high voltage regulation direction to be referred to: the while of the Over High-Limit Voltage of mesolow side, high side voltage is higher; Mesolow side voltage gets over lower limit, and high side voltage is on the low side simultaneously;
If b) mesolow side and high voltage regulation direction inconsistent, then continue to judge according to the idle situation in critical point, high-pressure side;
If high-pressure side is idle rationally, then preferentially regulate separately, as separately non-adjustable, then switching reactive apparatus;
If it is unreasonable that high-pressure side is idle, and idle adjustment direction is consistent with mesolow side voltage, then preferential switching reactive apparatus, if reactive apparatus can not switching, then regulates separately;
If it is unreasonable that high-pressure side is idle, and idle adjustment direction and mesolow side voltage inconsistent, preferentially regulate separately, as separately non-adjustable, then switching reactive apparatus;
The adjustment direction that high-pressure side is idle is consistent with voltage-regulation direction, mesolow side to be referred to: mesolow side Over High-Limit Voltage simultaneously high-pressure side reactive power releasing or power factor gets over the upper limit; Mesolow side voltage is lower limit high-pressure side power factor more lower limit simultaneously more;
The control mode that main transformer is idle is as follows:
When voltage is qualified, judge whether control unit main transformer high-pressure side is idle qualified, is specially:
1) if high-pressure side reactive power releasing: switching reactive apparatus corrects;
2) consider the error of idle measurement, the criterion of current reactive power releasing is that main transformer idle measurement in high-pressure side is less than error threshold;
During control that main transformer is idle, should ensure the qualified of busbar voltage, the control mode that main line voltage is optimized is as follows:
When voltage qualified and idle qualified, carry out main line voltage optimization, on high-tension side optimization voltage setting value adopts overall idle work optimization to calculate the voltage setting value provided;
Concrete is:
1) when high side bus voltage is more higher than Optimal Setting value, switching reactive apparatus regulates;
2) when high side bus voltage is more on the low side than Optimal Setting value, switching reactive apparatus regulates;
When high side bus voltage departs from Optimal Setting value, refer to that the deviation of the relative Optimal Setting value of current voltage measuring value has exceeded voltage optimization dead band, this dead band is an adjustable controling parameters;
When main line voltage is optimized, should ensure that busbar voltage is qualified and main transformer is rationally idle.
6. one kind adopts the automatism voltage control device of the method for automatic controlling voltage of electrical power as described in claim 1-5, it is characterized in that, automatism voltage control device comprises four modules: data processing module, logic judgment module, Corrective control module, human-computer interface module;
Data processing module comprises the real-time A Gengxin of human-computer dialogue data, the collection of real-time stream and refreshing and block signal, the refreshing of guard signal and the information feed back of process and automatic voltage control system control decision process;
Logic judgment module processes the data gathered, the voltage of each voltage monitoring point is incorporated in logic judgment module, when system is optimized calculating, remaining real time data information is incorporated in database, set the collection period of certain data, if voltage is still out-of-limit, then correct out-of-limit;
Automatic voltage control system constantly obtains real time data from SCADA with certain cycle, next step action is determined according to the result of logic judgment module, if voltage detecting is normal, then need the generating, the whether own change enough large through generation of load that judge system, if, then re-start idle work optimization according to optimized algorithm to current way to calculate, under judgement current operating conditions, the reactive power of tap gear number and each reactive source exports and Capacitor banks input amount;
The out-of-limit correction of Corrective control module adopts and controls on the spot and cooperation control and carrying out for optimization aim so that control action is minimum in conjunction with sensitivity analysis, pass through computational analysis, determine the throwing of capacitor according to current busbar voltage and power factor, cut adjustment, by adopting the result of sensitivity analysis quasi real time, carry out aid decision, according to the size controlling effect, effective voltage correction strategy is ranked, and pro rata size is shared the Corrective control of out-of-limit voltage jointly by each effective control appliance;
Corrective control module reads the control strategy generated in logic judgment module, after carrying out legitimacy verification, performs the control strategy of generation, analyzes the result of Corrective control, for Corrective control next time provides information and output journal, comprising:
(1) Corrective control interface
A, reading automatism voltage control Logic judgment result;
B, reading idle work optimization result;
C, reading scheduling or manual adjustment instruction;
(2) Corrective control
Be connected with other Processing Interface, add verification measure;
(3) daily record exports
Log complete in detail, have recorded operational circumstances;
Human-computer interface module is integrated with and arranges amendment Static and dynamic parameter, the layering showing real-time monitor message, the log information of inquiry printing statistics, the display of real-time issues and audio alert online with the process of remote control remote regulating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510432095.9A CN105140925A (en) | 2015-07-21 | 2015-07-21 | Electric power system automatic voltage control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510432095.9A CN105140925A (en) | 2015-07-21 | 2015-07-21 | Electric power system automatic voltage control method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105140925A true CN105140925A (en) | 2015-12-09 |
Family
ID=54726183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510432095.9A Pending CN105140925A (en) | 2015-07-21 | 2015-07-21 | Electric power system automatic voltage control method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105140925A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099940A (en) * | 2016-08-19 | 2016-11-09 | 云南电网有限责任公司电力科学研究院 | The computational methods that in transformer station, busbar voltage is affected by load tap changer gear |
| CN110808583A (en) * | 2019-11-06 | 2020-02-18 | 国网北京市电力公司 | Multi-objective-oriented substation optimization control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208803A (en) * | 2013-04-18 | 2013-07-17 | 国家电网公司 | Reactive voltage optimal control method for wind electricity and photo-electricity integrated grid connection |
| CN103312040A (en) * | 2013-07-02 | 2013-09-18 | 国家电网公司 | Control method for improving reliability of AVC (Automatic Voltage Control) system of electric power monitoring center |
| WO2014021152A1 (en) * | 2012-08-01 | 2014-02-06 | 株式会社日立製作所 | Voltage adjustment device for power distribution system, voltage adjusting method, and power control system |
-
2015
- 2015-07-21 CN CN201510432095.9A patent/CN105140925A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014021152A1 (en) * | 2012-08-01 | 2014-02-06 | 株式会社日立製作所 | Voltage adjustment device for power distribution system, voltage adjusting method, and power control system |
| CN103208803A (en) * | 2013-04-18 | 2013-07-17 | 国家电网公司 | Reactive voltage optimal control method for wind electricity and photo-electricity integrated grid connection |
| CN103312040A (en) * | 2013-07-02 | 2013-09-18 | 国家电网公司 | Control method for improving reliability of AVC (Automatic Voltage Control) system of electric power monitoring center |
Non-Patent Citations (3)
| Title |
|---|
| 付云平: "发电厂分布式电气控制系统中自动电压控制的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑（月刊）》 * |
| 焦波: "基于无功优化的自动电压控制系统", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑（月刊）》 * |
| 王珖玮: "北京电网自动电压控制系统（AVC）的应用研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑（月刊）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099940A (en) * | 2016-08-19 | 2016-11-09 | 云南电网有限责任公司电力科学研究院 | The computational methods that in transformer station, busbar voltage is affected by load tap changer gear |
| CN110808583A (en) * | 2019-11-06 | 2020-02-18 | 国网北京市电力公司 | Multi-objective-oriented substation optimization control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9660448B2 (en) | Multiple renewables site electrical generation and reactive power control | |
| CN107317345B (en) | Method for controlling frequency of isolated power grid by participation of electrolysis load | |
| US9203333B2 (en) | System and method for voltage control of wind generators | |
| CN105119291B (en) | A kind of reactive voltage distributed optimization control system and method | |
| US9318988B2 (en) | System and method for voltage control of wind generators | |
| CN110011329B (en) | Reactive power control method for low-voltage distribution area containing distributed photovoltaic | |
| CN103345205B (en) | Data verification-based AGC load optimizing controlling method | |
| CN101431240A (en) | Space-saving integrated AVC system control method considering step power station | |
| EP2889998B1 (en) | System and method for regulation of voltage on an electric power system | |
| CN105720611A (en) | Reactive power control method and system for wind power plant | |
| CN104810851A (en) | Load regulation speed dynamic regulating method and device under AGC mode of thermal power generating unit | |
| CN109217323A (en) | High-voltage convertor station phase modifier automatism voltage control AVC substation system and operation method | |
| CN113131490B (en) | Reactive power control method, device and system for new energy station | |
| CN107465198B (en) | A kind of wind power field automatic voltage control and system | |
| CN114123218B (en) | Overvoltage layering and partitioning suppression method for distribution network at distributed photovoltaic access terminal | |
| CN103390893A (en) | Automatic voltage control (AVC) method for hydropower station | |
| CN105140925A (en) | Electric power system automatic voltage control method and device | |
| CN103001236A (en) | Wind turbine generator reactive power regulation method and system based on air quenching cooler (AQC) of wind power plant | |
| JP2014128137A (en) | Power system monitoring control device | |
| WO2021135507A1 (en) | Method for measuring degree of stability of generator and power transmission line, and electrical grid control system | |
| CN107658886B (en) | Photovoltaic power station reactive voltage control system and method based on inverter hybrid response | |
| CN105262112B (en) | Wind power plant cluster formula static var compensator control method | |
| CN104201724B (en) | A kind of small hydropower station generator excitation regulating system and method | |
| CN110311425A (en) | Consider that the wind fire of peak regulation ancillary service quotation is deep and adjusts electric power optimal control method | |
| JP2020022320A (en) | Power supply-demand control device, power supply-demand control system, computer program for power supply-demand control, and power supply-demand control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151209 |