CN109103890A - Voltage adjusting method and system in a kind of low-voltage network - Google Patents
Voltage adjusting method and system in a kind of low-voltage network Download PDFInfo
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- CN109103890A CN109103890A CN201811128827.5A CN201811128827A CN109103890A CN 109103890 A CN109103890 A CN 109103890A CN 201811128827 A CN201811128827 A CN 201811128827A CN 109103890 A CN109103890 A CN 109103890A
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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
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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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Abstract
This application provides voltage adjusting method and systems in a kind of low-voltage network, specifically, carrying out node voltage analysis according to the three-phase voltage value of destination node in the low-voltage network of acquisition first；Then, judge whether to need to carry out switching distributed generation resource or reactive power source according to given threshold, if necessary to carry out switching operation, instruction is then issued to corresponding switching switch according to control logic, after switching switch receives order, execute corresponding instruction, so can effectively solve low-voltage network Voltage unbalance or overtension or it is too low caused by system power quality problems, low-voltage network optimization operation is realized, provides new technical support for the propulsion of power distribution automation.
Description
Technical field
This disclosure relates to which voltage is adjusted in low-voltage network operation control technology field more particularly to a kind of low-voltage network
Method and system.
Background technique
Low pressure distributed photovoltaic distributed power supply is advantageously accounted for as a kind of clean energy resource, scale access power distribution network
The problems such as environmental pollution and energy shortage.However, distributed generation resource access low-voltage network will generate seriously voltage's distribiuting
It influences, and then influences to be that low-voltage network operation brings bigger challenge.
Net mode, the operation controlling party proposed are all matched using three-phase four-wire system substantially based on current China's low-voltage network
Method mainly has the methods of the sagging control of tradition, power limitation control.Wherein, PQ control is the abbreviation of active/idle control strategy, is led to
It is usually used in schedulable micro battery power output control, uses preset value and power reference as active power dispatch and idle benefit
Repay value.In PQ control model, the active and reactive power of distributed generation resource is exported as the given value of controller.Inverter
Power output be also correspondingly set to constant, no matter how frequency in power grid and voltage change in this way, and controller all can
The given performance number of output, at this point, distributed generation resource is voltage-controlled current source.And sagging control is active by adjusting
Power/voltage reactive power/frequency realizes the control of power.The operation that sagging control is similar to generator in bulk power grid is special
Point, controlled according to the Variation Features of output power voltage inverter output keep its voltage and automatic frequency tracking scheduled under
Vertical characteristic.
The above-mentioned power supply using PQ control injects certain active power and reactive power into power grid, by load in system
The influence very little of variation or the power output variation of other power supplys.But distributed generation resource issue electric energy be not it is stable, to meet electricity
The source active and reactive power specified to power grid injection will necessarily select power supply to meet the minimum of condition as referring to, in turn
It will cause the waste of energy of power supply.The function of droop control technology is realized by droop control device, according to actual needs, can
To set different sagging coefficients.Droop control device is made of voltage droop control device and frequency droop controller, is realized point
The other control to voltage and frequency.But under the premise of keeping sagging coefficient constant, droop control device is it is possible that power grid
The case where output voltage excessive sag, increase that grid voltage amplitude caused by sagging adjusting is higher, the quality of voltage of power grid is made
At influence.
Therefore, it is urgent to provide a kind of stable low-voltage network progress control methods, so that low-voltage network optimization operation.
Summary of the invention
Voltage adjusting method and system in a kind of low-voltage network are provided in the embodiment of the present invention, to solve the prior art
Middle solution low-voltage network Voltage unbalance, overtension or too low caused system power quality problems, realize low-voltage distribution
Net stable operation.
According to a first aspect of the embodiments of the present invention, voltage adjusting method in a kind of low-voltage network, this method are provided
Include:
The three-phase voltage value of destination node in low-voltage network is obtained respectively；
Judge that the destination node nearby whether there is distributed generation resource；
If there is no distributed generation resource, then detect that voltage unbalance factor is set greater than system according to the three-phase voltage value
When after definite value, then by reactive power source switching into the destination node the highest phase of voltage；
If there is distributed generation resource, then whether the voltage value of phase line it is pre- be higher than first where judging the distributed generation resource
If voltage value；
If being higher than the first preset voltage value, the distributed generation resource is cut off；
If being not higher than the first preset voltage value, the electricity of phase line and the minimum phase of voltage where judging the distributed generation resource
Whether pressure difference is higher than the second preset voltage value；
If being higher than the second preset voltage value, the distributed generation resource is switched to the low phase of the voltage；
If being not higher than the second preset voltage value, detect that voltage unbalance factor is greater than system according to the three-phase voltage value
When after setting value, then by reactive power source switching into the destination node the highest phase of voltage.
Optionally, when detecting voltage unbalance factor greater than after default value according to the three-phase voltage value, then by nothing
Function power supply switching highest phase of voltage into the destination node, comprising:
Judge whether the voltage unbalance factor of the destination node is greater than default value according to the three-phase voltage value；
If it is greater than default value, then reactive power source is searched near the destination node, and by the reactive power source
Switch to the highest phase of voltage value in the three-phase voltage value.
Optionally, judge whether the voltage unbalance factor of the destination node sets greater than system according to the three-phase voltage value
Definite value, comprising:
According to the three-phase voltage value, formula ε is utilizedsj=(Ui-Uj)/Ui* 100% > ε0Judge the electricity of the destination node
Whether pressure degree of unbalancedness is greater than default value；
Wherein, εsjIndicate voltage unbalance factor, UiIndicate highest phase voltage value, U in the three-phase voltage valuejDescribed in expression
Minimum phase voltage value, ε in three-phase voltage value0Indicate default value.
Optionally, if being higher than the first preset voltage value, the distributed generation resource is cut off, comprising:
If being higher than the first preset voltage value, judge the distributed generation resource with the presence or absence of locking；
If there is no locking, then the distributed generation resource is cut off using Fast synchronization switching switch, and recorded described fast
The actuation time of fast synchronism switching switch.
Optionally, if being higher than the second preset voltage value, the distributed generation resource is switched to the low phase of the voltage,
Include:
If being higher than the second preset voltage value, judge the distributed generation resource with the presence or absence of locking；
If there is no locking, then it is low the distributed generation resource to be switched to the voltage using Fast synchronization switching switch
Phase, and record the actuation time of Fast synchronization switching switch.
According to a second aspect of the embodiments of the present invention, voltage-regulating system in a kind of low-voltage network is additionally provided, this is
System includes metering automation device and power switch control device, in which:
The metering automation device is arranged in main website, for acquiring the three-phase voltage of destination node in low-voltage network
Value；
The power switch control device, the three-phase voltage value for being acquired according to the metering automation device are held
The following operating procedure of row:
Judge that the destination node nearby whether there is distributed generation resource；
If there is no distributed generation resource, then detect that voltage unbalance factor is set greater than system according to the three-phase voltage value
When after definite value, then by reactive power source switching into the destination node the highest phase of voltage；
If there is distributed generation resource, then whether the voltage value of phase line it is pre- be higher than first where judging the distributed generation resource
If voltage value；
If being higher than the first preset voltage value, the distributed generation resource is cut off；
If being not higher than the first preset voltage value, the electricity of phase line and the minimum phase of voltage where judging the distributed generation resource
Whether pressure difference is higher than the second preset voltage value；
If being higher than the second preset voltage value, the distributed generation resource is switched to the low phase of the voltage；
If being not higher than the second preset voltage value, detect that voltage unbalance factor is greater than system according to the three-phase voltage value
When after setting value, then by reactive power source switching into the destination node the highest phase of voltage.
Optionally, the power switch control device further includes Fast synchronization switching switch, wherein the Fast synchronization is cut
Switch is changed to be connected between three-phase line and distributed generation resource and between three-phase line and reactive power source.
By above technical scheme as it can be seen that voltage adjusting method and system in low-voltage network provided in this embodiment, pass through
Monitoring to three voltage in each node and according to preset threshold, when occurring the voltage mistake of a certain phase on the node in power distribution network
Occur between high, too low or each phase voltage seriously unbalanced situation when, by being divided in time each phase according to control logic
Cloth power supply and reactive power source carry out switching, and then efficiently solve low-voltage network Voltage unbalance, overtension or too low
Caused system power quality problems, realize low-voltage network optimization operation, for power distribution automation propulsion provide it is new
Technical support.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without any creative labor, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow diagram of voltage adjusting method in a kind of low-voltage network provided by the embodiments of the present application；
Fig. 2 is the structural schematic diagram of voltage-regulating system in a kind of low-voltage network provided by the embodiments of the present application.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
To solve to solve low-voltage network Voltage unbalance, overtension or too low caused system power in the prior art
Quality problems present embodiments provide voltage adjusting method and system in a kind of low-voltage network, by low-voltage network
The switching of distributed generation resource and reactive power source makes low-voltage network run on the mode of economic optimum.
Based on the above principles, it will describe in detail below to method and system provided in this embodiment.Fig. 1 is the application
The flow diagram of voltage adjusting method in a kind of low-voltage network that embodiment provides.As shown in Figure 1, this method specifically includes
Following steps:
S110: the three-phase voltage value of destination node in low-voltage network is obtained respectively.
Specifically, can indicate each important node with j, respectively in the three-phase voltage value of the load of main website collection destination node
The voltage value of important node is denoted as Uaj, Ubj, Ucj.
S120: judge that the destination node nearby whether there is distributed generation resource.
If there is no distributed generation resource, S170 is thened follow the steps, carries out voltage unbalance factor detection；If there is distribution
Formula power supply thens follow the steps S130, carries out the detection of individual event voltage value.
S130: if there is distributed generation resource, then whether the voltage value of phase line is higher than where judging the distributed generation resource
First preset voltage value.
Wherein, shown in the following formula of judgment formula (1):
max(Ui)>US1Formula (1)
In formula, UiIndicate destination node voltage value, unit: kv；US1Indicate single-phase voltage given threshold, i.e., first is default
Voltage value, unit: kv.
If so, S140 is thened follow the steps, it is no to then follow the steps S150.
S140: if being higher than the first preset voltage value, the distributed generation resource is cut off.
Specifically, if it exists and the phenomenon that amplitude is greater than setting voltage value occurs in single-phase voltage, then can use quickly same
Step switching switch quickly cuts off distributed generation resource.
Further, in order to effective and quickly carry out switching to distributed generation resource, this step can also include following step
It is rapid:
S141: if being higher than the first preset voltage value, judge the distributed generation resource with the presence or absence of locking；
S142: if there is no locking, then the distributed generation resource is cut off using Fast synchronization switching switch, and record institute
State the actuation time of Fast synchronization switching switch.
S150: if being not higher than the first preset voltage value, phase line and voltage are minimum where judging the distributed generation resource
Whether the voltage difference of phase is higher than the second preset voltage value.
Wherein, shown in the following formula of judgment formula (2):
max(Ui-Uj)>ΔUS2Formula (2)
In formula, UiPhase voltage value where indicating distributed generation resource, unit: kv；UjIndicate the minimum phase voltage value of voltage, unit:
kv；ΔUS2Indicate voltage difference given threshold, i.e. the second preset voltage value, unit: kv.
If it is present step S160 is executed, it is no to then follow the steps S170.
S160: if being higher than the second preset voltage value, the distributed generation resource is switched to the low phase of the voltage.
Distributed generation resource is switched to low pressure phase by high pressure phase specifically, can use Fast synchronization switching switch.
Further, in order to effective and quickly carry out switching to distributed generation resource, this step can also include following step
It is rapid:
S161: if being higher than the second preset voltage value, judge the distributed generation resource with the presence or absence of locking；
S162: if there is no locking, then the distributed generation resource is switched to using Fast synchronization switching switch described
The low phase of voltage, and record the actuation time of the Fast synchronization switching switch.
S170: if being not higher than the second preset voltage value, detect that voltage unbalance factor is big according to the three-phase voltage value
When after default value, then by reactive power source switching into the destination node the highest phase of voltage.
Specifically, may include steps of:
S171: judge whether the voltage unbalance factor of the destination node is greater than default according to the three-phase voltage value
Value.
Specifically, formula ε can be utilized according to the three-phase voltage valuesj=(Ui-Uj)/Ui* 100% > ε0Described in judgement
Whether the voltage unbalance factor of destination node is greater than default value；
Wherein, εsjIndicate voltage unbalance factor, UiIndicate highest phase voltage value, U in the three-phase voltage valuejDescribed in expression
Minimum phase voltage value, ε in three-phase voltage value0Indicate default value.
S172: if it is greater than default value, then reactive power source is searched near the destination node, and will be described idle
Switch power supply to the highest phase of voltage value in the three-phase voltage value.
After completing the procedure, then next node in power distribution network can be continually looked for, switching distributed generation resource is passed through
Or reactive power source (capacitor group) makes power distribution network economical operation to realize the balance of voltage.
Monitoring provided in this embodiment by three voltage in each node and according to preset threshold, when in power distribution network
Occur occurring between the overtension of a certain phase, too low or each phase on node voltage seriously unbalanced situation when, pass through root
Switching is carried out to distributed generation resource and reactive power source in time according to control logic, and then it is uneven to efficiently solve low-voltage network voltage
Weighing apparatus, overtension or too low caused system power quality problems, realize low-voltage network optimization operation, are power distribution automation
Propulsion provide new technical support.
Based on above-mentioned adjusting method, the present embodiment additionally provides a kind of voltage-regulating system.Fig. 2 mentions for the embodiment of the present application
The structural schematic diagram of voltage-regulating system in a kind of low-voltage network supplied.As shown in Fig. 2, the system mainly includes power supply switching
Control device 210, and the metering automation device 220 being connect with power switch control device 210.Wherein:
Power switch control device 220 can be set in main website, for acquiring the three-phase of destination node in low-voltage network
Voltage value.
Then the three-phase voltage value for being acquired according to the metering automation device executes metering automation device 220
Following operating procedure:
Judge that the destination node nearby whether there is distributed generation resource；
If there is no distributed generation resource, then detect that voltage unbalance factor is set greater than system according to the three-phase voltage value
When after definite value, then by reactive power source switching into the destination node the highest phase of voltage；
If there is distributed generation resource, then whether the voltage value of phase line it is pre- be higher than first where judging the distributed generation resource
If voltage value；
If being higher than the first preset voltage value, the distributed generation resource is cut off；
If being not higher than the first preset voltage value, the electricity of phase line and the minimum phase of voltage where judging the distributed generation resource
Whether pressure difference is higher than the second preset voltage value；
If being higher than the second preset voltage value, the distributed generation resource is switched to the low phase of the voltage；
If being not higher than the second preset voltage value, detect that voltage unbalance factor is greater than system according to the three-phase voltage value
When after setting value, then by reactive power source switching into the destination node the highest phase of voltage.
Further, the power switch control device further includes Fast synchronization switching switch and switching switch control mould
Block, wherein Fast synchronization switching switch is connected between three-phase line and distributed generation resource and three-phase line and reactive power source
Between, switching switch control module then judges the Voltage unbalance of the node according to the three-phase voltage value of acquired destination node
Degree, and control Fast synchronization switching switch and carry out switching distributed generation resource or reactive power source.
Voltage-regulating system provided in this embodiment is based on power switch control device and metering automation device, and controls
The three-phase voltage of each load in metering automation device collection table area processed, and the voltage that will acquire is sent to power supply switching control dress
It sets.Power switch control device according to the node voltage degree of unbalancedness of setting judge whether to need to carry out switching distributed generation resource or
Reactive power source then switches switch to corresponding Fast synchronization according to control logic and issues instruction if necessary to carry out switching operation,
After Fast synchronization switching switch receives order, corresponding instruction is executed, and then it is uneven effectively to solve low-voltage network voltage
Weighing apparatus or overtension or too low caused system power quality problems, realize low-voltage network optimization operation, are that distribution is automatic
The propulsion of change provides new technical support.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.Apparatus and system embodiment described above is only schematical, wherein as separation
The unit of part description may or may not be physically separated, component shown as a unit can be or
It can not be physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to reality
Border needs to select some or all of the modules therein to achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art
It can understand and implement without creative efforts.
The above is only a specific embodiment of the invention, it is noted that those skilled in the art are come
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (7)
1. voltage adjusting method in a kind of low-voltage network characterized by comprising
The three-phase voltage value of destination node in low-voltage network is obtained respectively；
Judge that the destination node nearby whether there is distributed generation resource；
If there is no distributed generation resource, then detect that voltage unbalance factor is greater than default value according to the three-phase voltage value
When afterwards, then by reactive power source switching into the destination node the highest phase of voltage；
If there is distributed generation resource, then whether the voltage value of phase line where judging the distributed generation resource is higher than the first default electricity
Pressure value；
If being higher than the first preset voltage value, the distributed generation resource is cut off；
If being not higher than the first preset voltage value, the voltage difference of phase line and the minimum phase of voltage where judging the distributed generation resource
Whether value is higher than the second preset voltage value；
If being higher than the second preset voltage value, the distributed generation resource is switched to the low phase of the voltage；
If being not higher than the second preset voltage value, detect that voltage unbalance factor is greater than default according to the three-phase voltage value
When after value, then by reactive power source switching into the destination node the highest phase of voltage.
2. voltage adjusting method according to claim 1, which is characterized in that detect voltage according to the three-phase voltage value
Degree of unbalancedness be greater than default value after when, then by reactive power source switching into the destination node the highest phase of voltage, comprising:
Judge whether the voltage unbalance factor of the destination node is greater than default value according to the three-phase voltage value；
If it is greater than default value, then reactive power source is searched near the destination node, and the reactive power source is switched
To the highest phase of voltage value in the three-phase voltage value.
3. voltage adjusting method according to claim 2, which is characterized in that judge the mesh according to the three-phase voltage value
Whether the voltage unbalance factor of mark node is greater than default value, comprising:
According to the three-phase voltage value, formula ε is utilizedsj=(Ui-Uj)/Ui* 100% > ε0Judge the voltage of the destination node not
Whether the degree of balance is greater than default value；
Wherein, εsjIndicate voltage unbalance factor, UiIndicate highest phase voltage value, U in the three-phase voltage valuejIndicate the three-phase
Minimum phase voltage value, ε in voltage value0Indicate default value.
4. voltage adjusting method according to claim 1, which is characterized in that if being higher than the first preset voltage value, cut
Except the distributed generation resource, comprising:
If being higher than the first preset voltage value, judge the distributed generation resource with the presence or absence of locking；
If there is no locking, then the distributed generation resource is cut off using Fast synchronization switching switch, and recorded described quickly same
The actuation time of step switching switch.
5. voltage adjusting method according to claim 1, which is characterized in that, will if being higher than the second preset voltage value
The distributed generation resource is switched to the low phase of the voltage, comprising:
If being higher than the second preset voltage value, judge the distributed generation resource with the presence or absence of locking；
If there is no locking, then it is low the distributed generation resource to be switched to the voltage using Fast synchronization switching switch
Phase, and record the actuation time of the Fast synchronization switching switch.
6. voltage-regulating system in a kind of low-voltage network, which is characterized in that the system comprises metering automation device and electricity
Source switching control, in which:
The metering automation device is arranged in main website, for acquiring the three-phase voltage value of destination node in low-voltage network；
The power switch control device, the three-phase voltage value for being acquired according to the metering automation device execute with
Lower operating procedure:
Judge that the destination node nearby whether there is distributed generation resource；
If there is no distributed generation resource, then detect that voltage unbalance factor is greater than default value according to the three-phase voltage value
When afterwards, then by reactive power source switching into the destination node the highest phase of voltage；
If there is distributed generation resource, then whether the voltage value of phase line where judging the distributed generation resource is higher than the first default electricity
Pressure value；
If being higher than the first preset voltage value, the distributed generation resource is cut off；
If being not higher than the first preset voltage value, the voltage difference of phase line and the minimum phase of voltage where judging the distributed generation resource
Whether value is higher than the second preset voltage value；
If being higher than the second preset voltage value, the distributed generation resource is switched to the low phase of the voltage；
If being not higher than the second preset voltage value, detect that voltage unbalance factor is greater than default according to the three-phase voltage value
When after value, then by reactive power source switching into the destination node the highest phase of voltage.
7. system according to claim 6, which is characterized in that the power switch control device further includes that Fast synchronization is cut
Change switch, wherein Fast synchronization switching switch be connected between three-phase line and distributed generation resource and three-phase line with
Between reactive power source.
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| CN110957748A (en) * | 2019-12-17 | 2020-04-03 | 中国农业大学 | Three-phase voltage unbalance adjusting device and method |
| WO2021088452A1 (en) * | 2019-11-09 | 2021-05-14 | 许继集团有限公司 | Voltage control method for power distribution network circuit containing distributed power supplies, and device |
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