CN105977989B - The series and parallel combined active regulator of power distribution network - Google Patents
The series and parallel combined active regulator of power distribution network Download PDFInfo
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- CN105977989B CN105977989B CN201610407026.7A CN201610407026A CN105977989B CN 105977989 B CN105977989 B CN 105977989B CN 201610407026 A CN201610407026 A CN 201610407026A CN 105977989 B CN105977989 B CN 105977989B
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- compensating device
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- serial connection
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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
-
- 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
-
- 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 present invention relates to a kind of series and parallel combined active voltage adjusting devices of power distribution network, including serial connection capacitor compensating device and paralleling compensating device, serial connection capacitor compensating device is serially connected in main line by first switch, paralleling compensating device is connected in main line, and it is set to after serial connection capacitor compensating device, paralleling compensating device is silent oscillation dynamic reactive generating device, active voltage adjusting device further includes the switch state detector that state of moving back is thrown for detecting series capacitor, which connect with first switch and paralleling compensating device respectively.Compared with prior art, the present invention uses series and parallel combined active regulator in power distribution network, route terminal voltage can effectively be promoted, reduce network loss, relatively single series connection or compensation device arranged side by side, series and parallel combined active regulator have the advantages that not influenced by system voltage and load current variation.
Description
Technical field
The present invention relates to a kind of intelligent power system technologies, more particularly, to a kind of series and parallel combined active tune of power distribution network
Pressure device.
Background technique
Many distribution lines there are line losses it is high, terminal voltage is low the problems such as, voltage is carried out using conventional paralleling compensating device
The problem of adjustment needs very big installed capacity, brings power factor decline and network loss increase while adjusting voltage again；For up to
To same voltage boosting effect, serial connection capacitor compensating device can be substantially reduced than paralleling compensating device capacity, but series electrical
Container compensation device can only be according to the passive pressure regulation of load current, and when load current is small, voltage boosting effect is poor, load current
The problem of being easy to produce " overvoltage " again when big, and mechanical switch frequent movement easily damages.
Also with the presence of small part series and parallel device, but since application is not extensive, switching logic is also unreasonable, real
Border using effect and perfect condition are far apart.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of power distribution network is series-parallel
Hybrid active regulator.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of series and parallel combined active voltage adjusting device of power distribution network, including serial connection capacitor compensating device and shunt compensation dress
It sets, the serial connection capacitor compensating device is serially connected in main line by first switch, and the paralleling compensating device is connected to master
In route, and it is set to after serial connection capacitor compensating device, the paralleling compensating device is silent oscillation dynamic reactive generating device,
The active voltage adjusting device further includes the switch state detector that state of moving back is thrown for detecting series capacitor, the switch state
Detection device is connect with first switch and paralleling compensating device respectively；
When serial connection capacitor compensating device exits, paralleling compensating device output when main line voltage is less than target value is held
Property reactive power, otherwise output lagging reactive power；When serial connection capacitor compensating device investment, paralleling compensating device is in main line
Road voltage exports lagging reactive power when being less than target value, otherwise output capacitive reactive power.
The serial connection capacitor compensating device is high-speed switch type serial connection capacitor compensating device, including benefit parallel with one another
Capacitor and by-pass switch are repaid, the compensating electric capacity postpones the first setting time interval after main circuit voltage is lower than investment definite value and sends out
Out for controlling the switching signal of by-pass switch combined floodgate, between postponing the second setting time after main circuit voltage is higher than and exits definite value
Every issuing the sub-gate signal for controlling by-pass switch separating brake.
First setting time interval is consistent with the second setting time interval.
The serial connection capacitor compensating device further includes the zinc oxide voltage limiter in parallel with compensating electric capacity.
The paralleling compensating device includes low voltage three-phase VSC module interconnected and step-up transformer, and the boosting becomes
Depressor is connect with main line.
Compared with prior art, the invention has the following advantages that
1) series and parallel combined active regulator is used in power distribution network, can effectively promote route terminal voltage, is reduced
Network loss, relatively single series connection or compensation device arranged side by side, series and parallel combined active regulator have not by system voltage and
The advantages of influence of load current variation.
2) range of regulation is big, and voltage boosting effect is significant, and target voltage is continuously adjustable.
3) place capacity is small, is lost low, and the method for operation is flexible, mechanical switch need not frequent movement, equipment failure rate is low.
4) part in series uses the switching logic judgement mode based on voltage, simple and reliable, works independently, not by portion in parallel
Dividing influences；Parallel connection part uses the voltage close loop voltage regulating mode based on PI, and degree of regulation is high, and target voltage is continuously adjustable, can
To control target by user's sets itself according to system situation.
5) by the control strategy of the operating status access parallel connection part of inline bypass switch.Shunt compensation retains basic simultaneously
Open loop reactive compensation strategy and manual open-loop idle output policy it is continuous to be able to satisfy voltage using different control strategies
It adjusts and requires, and be able to satisfy reactive compensation and power factor check requirements, played static passive compensation device to greatest extent
Dynamic regulation ability.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the circuit diagram of the embodiment of the present invention；
Fig. 3 is the series and parallel combined active regulator system access schematic diagram of power distribution network；
Fig. 4 is part in series control strategy schematic diagram；
Fig. 5 is parallel connection part control strategy schematic diagram；
Wherein: 1, serial connection capacitor compensating device, 2, paralleling compensating device, 3, switch state detector,
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
This application discloses a kind of series and parallel combined active regulators for power distribution network, maintain series compensation tune
The advantage that effect is obvious and shunt compensation output capacity is continuously adjustable is pressed, is not influenced by system parameter and load current variation,
Voltage can be continuously adjusted on a large scale, guarantee that preferable low-voltage regulation effect can be obtained under various operating conditions, and device itself
Capacity is small, and it is a kind of low-voltage controlling device relatively advanced in current power distribution network that loss is low.
A kind of series and parallel combined active voltage adjusting device of power distribution network, as shown in Figure 1, including serial connection capacitor compensating device 1
With paralleling compensating device 2, serial connection capacitor compensating device 1 is serially connected in main line by first switch, and paralleling compensating device 2 is simultaneously
It is connected in main line, and is set to after serial connection capacitor compensating device 1, paralleling compensating device 2 is the generation of silent oscillation dynamic reactive
Device, active voltage adjusting device further include the switch state detector 3 that state of moving back is thrown for detecting series capacitor, the switch shape
State detection device 3 is connect with first switch and paralleling compensating device 2 respectively；
When serial connection capacitor compensating device 1 exits, paralleling compensating device 2 is exported when main line voltage is less than target value
Capacitive reactive power, otherwise output lagging reactive power；When serial connection capacitor compensating device 1 is put into, paralleling compensating device 2 exists
Main line voltage exports lagging reactive power when being less than target value, otherwise output capacitive reactive power.
Series and parallel combined active regulator is made of tandem arrangement and shunting means, and shunting means is installed on series connection dress
After setting, main wiring diagram as shown in Fig. 2, serial connection capacitor compensating device 1 be high-speed switch type serial connection capacitor compensating device 1,
Including compensating electric capacity C and by-pass switch KK parallel with one another, compensating electric capacity C postpones the after main circuit voltage is lower than investment definite value
One setting time interval issues the switching signal to close a floodgate for controlling bypass KK switch, after main circuit voltage is higher than and exits definite value
Postpone the second setting time interval and issues sub-gate signal for controlling by-pass switch KK separating brake, the first setting time interval and
Two setting time intervals are consistent.
Serial connection capacitor compensating device 1 further includes the zinc oxide voltage limiter FR in parallel with compensating electric capacity.
Part in series uses presently the most advanced " high-speed switch type serial connection capacitor compensating device 1 " and traditional string
Connection power capacitor reactive compensation installation 1 is compared, and the present apparatus has following improve: first is that over-voltage protector is by nonlinear resistance (zinc oxide
Voltage limiter) portable protective gaps are replaced, avoid the discrete problem for causing protection act unstable of gap action value；Second is that when by acting
Between be the high-speed switch within 10ms instead of traditional switch at a slow speed, in conjunction with fast failure identification technology, make to protect whole group dynamic
It is greatly reduced as the time, significantly reduces the working time of zinc oxide voltage limiter and discharge capacity under fault condition.Series compensation
Device voltage regulating effect is significant, when under load current suitable conditions, it is only necessary to lesser installed capacity i.e. can reach compared with
High voltage regulation result.
Paralleling compensating device 2 include low voltage three-phase VSC module interconnected and step-up transformer T, step-up transformer T with
Main line connection.Parallel connection part uses presently the most advanced silent oscillation dynamic reactive generating device (hereinafter referred to as " SVG "), by
Low voltage three-phase VSC module, step-up transformer composition.Major function is to adjust series compensation device outlet side reactive power Q SVG, is guaranteed
System voltage and idle equal qualification under various operating conditions.
When system voltage is too low or load current is too small make series compensation device compensate after voltage it is still lower when, SVG hair
Inductive reactive power out, to promote exit potential；Electricity after system voltage is excessively high or load current crosses the compensation of ambassador's series compensation device
When pressing through high, SVG issues capacitive reactive power, to reduce voltage.Therefore, the voltage increase effect of series and parallel combined active regulator
Fruit is not influenced by system voltage and load current variation, and exit potential can be qualified under various operating conditions, is ideal one
Kind low-voltage controlling device.
The series and parallel combined active regulator system access scheme of power distribution network is as shown in figure 3, series-parallel formula active
The changing value of UL is as follows before and after regulator range of regulation Δ U%, i.e. device access system:
U in formulah- route voltage rating, kV
XCThe group capacitive reactance of-series capacitor, Ω；
QL- reactive load power, kvar；
QSVG- SVG maximum reactive power, kvar；
Under normal circumstances, Xc (series capacitor capacitor value) is much larger than Xs (system equivalent induction reactance value), therefore, mends in parallel connection
It repays in the identical situation of 2 capacity of device, the voltage regulating effect of the present apparatus significantly improves, and can reach pure paralleling compensating device 2
Several times (under equivalent capability, range of regulation is than high Xc/Xs times of conventional parallel compensation device 2), it can generally accomplish -20%~+
20% adjustable range, this is that individual paralleling compensating device 2 is extremely difficult to.
Work as QLWhen variation, traditional series compensation device exit potential necessarily changes, and voltage is unable to maintain that stabilization；And this dress
The Q setSVGReversed adjustment can be done, Q is madeSVG+QLSummation remain unchanged, therefore, QLDevice exit potential can maintain when variation
It is constant；When system voltage Us changes, the exit potential of device can also follow variation, and the SVG of the present apparatus can adjust it
Idle output makes exit potential remain unchanged.In conclusion working as system voltage Us or reactive load QLWhen changing, device is equal
Output voltage approximately constant can be maintained, achievees the purpose that steady load end voltage.
When system voltage and constant load, by modifying target voltage values, SVG exports idle corresponding change, makes route
Voltage value reaches target value, and target voltage is continuously adjustable, to keep line voltage distribution continuously adjustable, this is traditional series compensation
What device can not be accomplished.
Traditional serial connection capacitor compensating device 1 is by mechanical switch switching series capacitor, if system voltage changes
Range is big, and changes frequently, and mechanical switch frequent switching easily damages, and the present apparatus passes through SVG active pressure regulation, can be to avoid machine
Tool switchs frequent movement, is conducive to equipment and runs steadily in the long term.
The control strategy of the series and parallel combined active regulator of power distribution network is by part in series control strategy and parallel connection part
Control strategy two parts composition.
The control target of part in series is the by-pass switch (KK) of series capacitor group, when system voltage is lower than investment definite value
When send out the order of by-pass switch separating brake, series capacitor group investment；When system voltage is higher than definite value, hair by-pass switch, which closes a floodgate, orders,
Series capacitor group exits.Part in series switching control logic is as shown in Figure 4.
Angle δ of the control target of parallel connection part between system voltage and SVG output voltage can be obtained by adjusting δ
Obtain idle output characteristics on a large scale.
When steady-state operation, active power that SVG is injected to system, reactive power are respectively as follows:
Control mode for the voltage regulation accuracy for guaranteeing voltage parallel part (SVG), SVG in parallel is controlled using closed loop PI
Mode removes control angle δ by the deviation between target voltage values and bus measurement voltage value.
Parallel connection part uses the voltage close loop voltage regulating mode based on PI, and degree of regulation is high, and target voltage is continuously adjustable, can
To control target by user's sets itself according to system situation.
When inline bypass, which switchs, to close a floodgate, when string benefit exits, SVG, which will issue capacitive reactive power, so that target voltage is promoted,
SVG, which will issue lagging reactive power, so that target voltage is reduced；And when inline bypass switchs separating brake, and string mends investment, SVG, which is issued, to be held
Property reactive power target voltage will be made to reduce, SVG issue lagging reactive power target voltage will be made to be promoted.According to the above characteristic,
The control strategy for the operating status access parallel connection part that inline bypass should be switched.Simultaneously shunt compensation retain basic open loop without
Function compensation policy and the idle output policy of manual open-loop are able to satisfy voltage and are continuously adjusted requirement using different control strategies,
It is able to satisfy reactive compensation and power factor check requirements again, has played the dynamic of static passive compensation device (SVG) to greatest extent
State regulating power.
Parallel connection part (SVG) voltage close loop control strategy is as shown in Figure 5.
Claims (4)
1. a kind of series and parallel combined active voltage adjusting device of power distribution network, including serial connection capacitor compensating device and shunt compensation dress
It sets, the serial connection capacitor compensating device is serially connected in main line and connect with first switch, and the paralleling compensating device simultaneously connects
It in main line, and is set to after serial connection capacitor compensating device, which is characterized in that the paralleling compensating device is dynamic for silent oscillation
State reactive generating device, the active voltage adjusting device further include the switch state detection that state of moving back is thrown for detecting series capacitor
Device, the switch state detector are connect with first switch and paralleling compensating device respectively,
When serial connection capacitor compensating device exits, paralleling compensating device main line voltage be less than target value when output capacitive without
Function power, otherwise output lagging reactive power；When serial connection capacitor compensating device investment, paralleling compensating device is in main line electricity
Pressure exports lagging reactive power when being less than target value, otherwise output capacitive reactive power；
The serial connection capacitor compensating device is high-speed switch type serial connection capacitor compensating device, including compensation electricity parallel with one another
Hold and by-pass switch, the compensating electric capacity postpone the first setting time interval after main circuit voltage is lower than investment definite value and issue use
In the switching signal that control by-pass switch closes a floodgate, postpones the second setting time interval after main circuit voltage is higher than and exits definite value and send out
Out for controlling the sub-gate signal of by-pass switch separating brake.
2. the series and parallel combined active voltage adjusting device of a kind of power distribution network according to claim 1, which is characterized in that described
One setting time interval is consistent with the second setting time interval.
3. the series and parallel combined active voltage adjusting device of a kind of power distribution network according to claim 1, which is characterized in that the string
Joining power capacitor reactive compensation installation further includes the zinc oxide voltage limiter in parallel with compensating electric capacity.
4. the series and parallel combined active voltage adjusting device of a kind of power distribution network according to claim 1, which is characterized in that it is described simultaneously
Connection compensation device includes low voltage three-phase VSC module interconnected and step-up transformer, and the step-up transformer and main line connect
It connects.
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| CN201610407026.7A CN105977989B (en) | 2016-06-12 | 2016-06-12 | The series and parallel combined active regulator of power distribution network |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201946982U (en) * | 2011-02-23 | 2011-08-24 | 福建省电力有限公司宁德电业局 | 10kV distribution line serial compensation and voltage regulation device based on an adaptive control |
| CN105226657A (en) * | 2015-10-26 | 2016-01-06 | 国网上海市电力公司 | A kind of series-parallel comprehensive compensation arrangement administered for power distribution network low-voltage |
| CN205283139U (en) * | 2015-12-16 | 2016-06-01 | 安徽合凯电气科技股份有限公司 | Connection in series -parallel integration compensation arrangement |
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| EP1825585A1 (en) * | 2004-12-16 | 2007-08-29 | Abb Research Ltd. | Electric power flow control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201946982U (en) * | 2011-02-23 | 2011-08-24 | 福建省电力有限公司宁德电业局 | 10kV distribution line serial compensation and voltage regulation device based on an adaptive control |
| CN105226657A (en) * | 2015-10-26 | 2016-01-06 | 国网上海市电力公司 | A kind of series-parallel comprehensive compensation arrangement administered for power distribution network low-voltage |
| CN205283139U (en) * | 2015-12-16 | 2016-06-01 | 安徽合凯电气科技股份有限公司 | Connection in series -parallel integration compensation arrangement |
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