CN106340885B - A kind of end Network Voltage Stability system and control method - Google Patents
A kind of end Network Voltage Stability system and control method Download PDFInfo
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- CN106340885B CN106340885B CN201610868736.XA CN201610868736A CN106340885B CN 106340885 B CN106340885 B CN 106340885B CN 201610868736 A CN201610868736 A CN 201610868736A CN 106340885 B CN106340885 B CN 106340885B
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
The invention discloses a kind of end Network Voltage Stability systems, including control unit, SVG branch, multichannel Reactor Branch and voltage detecting part, SVG branch and multichannel Reactor Branch are parallel with one another, SVG device is provided in SVG branch, reactor is provided in Reactor Branch, current detecting part and switch are provided in SVG branch and each Reactor Branch, control unit is connected with voltage detecting part, switch, current detecting part and SVG device.Invention additionally discloses a kind of control methods, voltage detecting part acquires network voltage, control unit compares voltage signal and preset standard voltage signal, and the reactive capability of calculating voltage difference and required output controls the switch of each Reactor Branch, to realize the switching of each Reactor Branch；Control unit controls SVG device output lagging reactive power or capacitive reactive power according to each current signal.System and method of the invention all has the advantages that reducing SVG device capacity and loss.
Description
Technical field
The invention mainly relates to power supply technique field, a kind of end Network Voltage Stability system and control method are refered in particular to.
Background technique
With the continuous development of social economy and industrial technology, the capacity of electric system is continuously increased, and electric network composition is increasingly
It is complicated and huge, so that being widely present power supply reliability, power quality and efficiency of transmission problem in distribution system.Wherein voltage
Quality is a very important standard in power quality, and the quality of voltage is not only for industrial and agricultural production and people's lives
There is very big influence, and it also has very big influence for the safe operation of power grid and the economic benefit of power grid.It is close
Nian Lai, China's power network development is very fast, the electric railway in cities and towns and the continuous development of city rail traffic, and controls flood, is anti-
The infrastructure constructions such as flood, trans-regional property power supply in city etc., promote the long range power applications of power supply line more and more extensive, and
And power supply voltage level is presented and steps up, it is had been raised to based on 10 to 35kV grade from the 6kV to 10kV more early used, and
The features such as power supply line's length is more and more longer.
The long range of power supply line, high voltage transmission engineering all bring new skill to the design of route, construction and use
Art problem.Such as: power supply line is considerable from transmission of electricity, and route inductive reactive power is lost, and line voltage distribution loss causes end voltage drop
It is low；Cable capacity current is present in cable, causes route protection malfunction and line-breaker tripping, the capacitive reactive power of generation
Power can cause a series of voltage stability techniques problems such as voltage cables end voltage raising.
It solves the problems, such as that the method for Network Voltage Stability is usually used at present expand the capacity of transformer, increase distribution line
Line footpath, change power grid power supply mode, shorten the methods of power supply network length to improve power supply capacity, mainly pass through reduction and become
The equivalent impedance of depressor and route reduces voltage stability problem caused by the loss of voltage.To seek better solution party
Method, many people did relevant research, were at present usually to install reactive power compensator, such as setting TCR+ additional in power supply network end
FC, TSC, SVG type dynamic reactive compensation device etc. carries out detailed analysis to various solutions below:
1, TCR+FC type compensation device, mainly includes thyristor-controlled reactor and multiple branch circuit capacitor group, predominantly
System power grid provides continuously adjustable perception and capacitive reactive power, while capacitor group part may be alternatively configured single order, second order etc.
The filter branch of form mainly mends inductive reactive power in system, it can be achieved that filtering out for some characteristic harmonics in power grid
It repays, reaches and improve end network voltage.
2, TSC device is thyristor switchable capacitor group device, thyristor component and capacitor group including plural serial stage.
Capacitor group is accessed into power grid by control turn on thyristors, and is turned off naturally using thyristor current flows zero passage to exit capacitor
Group is mainly realized and provides capacitive reactive power compensation to power grid end, with inductive reactive power in balanced circuit, reaches end voltage
The purpose of promotion.
3, SVG device is a kind of novel static synchronous reactive compensator in recent years, main complete including plural serial stage
Control type power electronic device, and the inductor being connect with power grid.By controlling the on-off of all-controlling power electronics device, change
The phase difference of output voltage and electric current so that SVG device issues corresponding capacitive or lagging reactive power, can in power grid because
Voltage stability problem caused by capacitive reactive power or inductive reactive power.
4, in grid power supply system, in especially regional power supply system, using TSR or MCR device switching or adjusting
Parallel reactor device stablizes power grid or transmission line of electricity end voltage, and wherein TSR device is mainly by shunt reactor, switching
Breaker and attached protective device etc. are constituted, and MCR device is mainly by a magnet controlled reactor, low-voltage thyristor component and its tune
Save control system composition, both issue adjustable or continuous inductive reactive power using reactor, in compensated line over the ground
Or alternate capacitive reactive power, to have the function that voltage stabilization.
The deficiency of various solutions is described further below:
1, for currently, solving the problems, such as that the capacity for expanding transformer, increasing is usually used in the method for Network Voltage Stability
The line footpath of distribution line changes power grid power supply mode, shortens the methods of power supply network length to improve power supply capacity, cardinal principle
It is to reduce voltage stability problem caused by the loss of voltage by reducing the equivalent impedance of transformer and route.But these
Method investment is big, long in time limit, and with the increase of load current, and the loss of voltage of transformer and route also will increase, therefore
This kind of mode is without fundamentally solving the problems, such as power grid end voltage stabilization.
2, for TCR+FC type SVC compensation device is used, mainly inductive reactive power in system is compensated, reaches raising
Power grid end voltage, application are to be born in tractive power supply system, remote-distance overhead wire and similar system according to route mostly
Lotus changes real-time detecting system voltage, reactive power etc., the idle output of dynamic regulation SVC, compensated line inductive reactive power, to propose
Up voltage, improves end voltage stability, and equipment uses Controlled Reactor and large value capacitor group combining form, land occupation
Area is big, and equipment loss is big, and plant maintenance amount is more, while reactive power provided by SVC device is with the reduction of system voltage
And it reduces.
3, it for TSC device is used, mainly realizes the multiple groups switching of capacitor group, compensates power network line inductive reactive power function
Rate reduces network loss and promotes end voltage, but this mode just for power grid there are being compensated when inductive reactive power, and adopted for similar
The end voltage increase problem caused by charging capacitor when cable power supply not can solve but.
4, it when using TSR or MCR device, can be exported by the lagging reactive power of control device, primarily directed to power supply
There are problems that the raising of end voltage caused by route capacitive charging current is administered in net, using switching or adjusts inductive reactive power
Power comes in balanced feeding net to charge capacitive reactive power, reduces power supply network end voltage, achievees the purpose that burning voltage, function
It has some limitations.
Summary of the invention
The technical problem to be solved in the present invention is that, for technical problem of the existing technology, the present invention provides one
Kind structure is simple, voltage regulation result is good and reduces the end Network Voltage Stability system of SVG device capacity and loss, and accordingly mentions
For a kind of control method easy to operate, reducing SVG device capacity and loss.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of end Network Voltage Stability system, including control unit, SVG branch, multichannel Reactor Branch and for examining
Survey the voltage detecting part of end network voltage, the SVG branch and multichannel Reactor Branch is parallel with one another accesses to end power grid
In, it is provided with SVG device in the SVG branch, reactor, the SVG branch and each electricity are provided in the Reactor Branch
The current detecting part for detecting corresponding branch current is provided in anti-device branch and for controlling corresponding branch on-off
Switch, the voltage detecting part be connected with described control unit the end mains voltage signal for will test be sent to control singly
Member, described control unit are connected, with the switch for according to the difference between end mains voltage signal and preset standard voltage
Value control respectively switches on-off the switching to realize corresponding Reactor Branch, described control unit and the SVG device and each electricity
Detection piece is flowed to be connected, for controlling the work of the SVG device according to each current detecting part to balance end network voltage.
As a further improvement of the above technical scheme:
Soft charge unit is in series in the SVG branch, for the precharge before SVG device starting, the soft charge list
Member is parallel with shorting switch.
FV arrester is provided in the SVG branch and Reactor Branch, for carrying out overvoltage protection.
It is connected by feeder breaker with end power grid after the SVG branch and multichannel reactor branch circuit parallel connection.
The quantity of the Reactor Branch is two-way.
Invention additionally discloses a kind of control method based on Network Voltage Stability system in end as described above, the voltages
Detection piece is acquired to the voltage of end power grid in real time and is sent to control unit, and described control unit believes the voltage of acquisition
It number is compared with preset standard voltage signal, calculates the reactive capability of voltage difference and required output, the control is singly
Member controls the switch of each Reactor Branch according to comparing result, to realize the switching of each Reactor Branch；Each current detecting part inspection
It surveys the electric current of corresponding branch and current signal is sent to control unit, described control unit controls SVG according to each current signal
Device exports lagging reactive power or capacitive reactive power.
As a further improvement of the above technical scheme:
When the voltage signal of voltage detecting part acquisition is greater than preset standard voltage, described control unit control is respectively opened
It closes and closes, so that each Reactor Branch puts into and exports lagging reactive power；Described control unit is according to each current detecting part meter
The lagging reactive power for calculating each Reactor Branch output, the nothing needed for the lagging reactive power of each Reactor Branch output meets
When power capacity amount, the SVG device does not start, and otherwise SVG device starting is to supplement lagging reactive power so that end network voltage
Signal stabilization is to preset standard voltage value.
When the voltage signal of voltage detecting part acquisition is less than preset standard voltage, described control unit control is respectively opened
Shutdown is opened to cut off each Reactor Branch；Described control unit controls SVG device starting output capacitive reactive power to end electricity
Net voltage compensates, so that it is stablized to preset standard voltage value.
Compared with the prior art, the advantages of the present invention are as follows:
End Network Voltage Stability system of the invention, in such a way that SVG branch is matched with multichannel Reactor Branch,
Perception can be carried out to end network voltage or capacitive reactive power compensates；Along being compensated using the inductance of shunt reactor
Distribution capacity can reach the raised purpose of limiting circuitry power-frequency overvoltage；SVG device is combined with Reactor Branch, can be significantly
The whole volume of SVG device is reduced, device running current is reduced, reduces SVG equipment loss.
The control method of end Network Voltage Stability system of the invention not only has with systems stabilisation as above excellent
Point, and it is easy to operate, voltage regulation result is good, for network voltage carry out dynamically track compensation, keep power supply network end voltage it is steady
It is scheduled near standard value.
Detailed description of the invention
Fig. 1 is electrical schematic of the invention.
Fig. 2 is control circuit schematic diagram of the invention.
Fig. 3 is the circuit diagram of SVG device in the present invention.
Figure label indicates: 1, control unit；2, SVG branch；21, SVG device；22, linked reactor；23, electric current is examined
Survey part；24, it switchs；3, Reactor Branch；31, reactor；4, feeder breaker；5, voltage detecting part.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As shown in Figure 1 to Figure 3, the end Network Voltage Stability system of the present embodiment, including control unit 1, SVG branch 2,
Multichannel Reactor Branch 3 and voltage detecting part 5 for detecting end network voltage, SVG branch 2 and multichannel Reactor Branch 3
It is parallel with one another to access in the power grid of end, SVG device 21(silent oscillation synchronization reactive compensator is provided in SVG branch 2), electricity
It is in series with reactor 31 in anti-device branch 3, is provided in SVG branch 2 and each Reactor Branch 3 for detecting corresponding branch electricity
TA1~TAn in current detecting part 23(Fig. 1 of stream) and switch 24(QS1, QS11 for controlling corresponding branch on-off~
QSn1), the PT in voltage detecting part 5(Fig. 2) the end mains voltage signal that is connected with control unit 1 for will test is sent to
Control unit 1, control unit 1 are connected, for according between end mains voltage signal and preset standard voltage with switch 24
Difference controls the on-off of each switch 24 to realize the switching of corresponding Reactor Branch 3, control unit 1 and SVG device 21 and each electricity
Stream detection piece 23 is connected, the work for controlling SVG device 21 according to each current detecting part 23 is to balance end network voltage, with
It is stablized in standard voltage value.End Network Voltage Stability system of the invention, using SVG branch 2 and multichannel Reactor Branch 3
The mode matched can carry out perception to end network voltage or capacitive reactive power compensates；Use shunt reactor 31
Inductance can reach the raised purpose of limiting circuitry power-frequency overvoltage come the distribution capacity along compensating；SVG device 21 and reactor
Branch 3 combines, and can substantially reduce the whole volume of SVG device 21, reduces device running current, reduces SVG equipment loss.
In the present embodiment, SVG device 21 includes SVGF current transformer, as shown in figure 3, its single group IGBT module is by bridge type inverse
Device constitutes voltage-type inversion unit, and complexes are the cascade of multiple groups IGBT module, realizes reactive current, voltage transformation, quite
In the controllable voltage source of a voltage and phase size.Chain type SVG device 21 is connect by linked reactor 22 with power grid, will be straight
Stream side voltage transformation is alternating voltage, suitably adjusts the phase and amplitude of exchange side output voltage, and circuit can be made to absorb or send out
The reactive current met the requirements out realizes dynamic reactive power compensation.
Precharge before being in series with soft charge unit R in SVG branch 2, starting for SVG device 21, soft charge unit is simultaneously
It is associated with shorting switch, for being shorted soft charge unit R in normal work.It is provided in SVG branch 2 and Reactor Branch 3
FV arrester (FV1~FVn in Fig. 1), for carrying out overvoltage protection.After 3 parallel connection of SVG branch 2 and multichannel Reactor Branch
It is connected by feeder breaker 4QF with end power grid.
The present invention further correspondingly discloses a kind of control method based on Network Voltage Stability system in end as described above, electricity
Pressure detection piece 5 is acquired to the voltage of end power grid in real time and is sent to control unit 1, and control unit 1 is by the voltage of acquisition
Signal is compared with preset standard voltage signal, calculates the reactive capability of voltage difference and required output, control unit 1
The switch 24 of each Reactor Branch 3 is controlled, according to comparing result to realize the switching of each Reactor Branch 3；Each current detecting part
23 detect the electric current of corresponding branch and current signal are sent to control unit 1, and control unit 1 is controlled according to each current signal
SVG device 21 exports lagging reactive power or capacitive reactive power.
In the present embodiment, when the voltage signal that voltage detecting part 5 acquires is greater than preset standard voltage, control unit 1 is controlled
It makes each switch 24 to be closed, so that each Reactor Branch 3 puts into and exports lagging reactive power；Control unit 1 is examined according to each electric current
It surveys part 23 and calculates the lagging reactive power that each Reactor Branch 3 exports, when the lagging reactive power of each Reactor Branch 3 output is full
Enough when required reactive capability, SVG device 21 does not start, and otherwise the starting of SVG device 21 is to supplement lagging reactive power so that end
Mains voltage signal is held to stablize to preset standard voltage value.When network voltage has fluctuation, 21 real-time detection power grid electricity of SVG device
Pressure value, according to the output of voltage ripple of power network dynamic regulation lagging reactive power, to ensure that Network Voltage Stability is attached in standard value
Closely.
In the present embodiment, when the voltage signal that voltage detecting part 5 acquires is less than preset standard voltage, control unit 1 is controlled
Each switch 24 is made to disconnect to cut off each Reactor Branch 3；Control unit 1 controls the starting output capacitive reactive power of SVG device 21
End network voltage is compensated, so that it is stablized to preset standard voltage value.When network voltage has fluctuation, SVG device
21 real-time detection network voltage values, according to the output of voltage ripple of power network dynamic regulation reactive power, to ensure that network voltage is steady
It is scheduled near standard value.
In addition, the present invention is mainly made of SVG branch 2 and shunt reactor branch 3, protection scheme is mainly SVG branch
The protection of road 2 is protected with shunt reactor branch 3, and wherein SVG branch 2 mainly uses current transformer main body protection and loop protection, this
Body protection includes mainly converter module error protection, control system error protection etc., and loop protection mainly includes that route is excessively electric
Pressure protection, route overcurrent protection；It mainly includes overvoltage protection and overcurrent protection, three-phase that shunt reactor branch 3, which is protected,
Uneven, current differential protection.
(1) when SVG control system, which breaks down, to trip, shunt reactor 31 will not trip at once, shunt reactor
3 protective device of branch can detect the non-terminal voltage signal of power supply network, if the non-terminal voltage signal of power supply network is higher than standard voltage value, and
Connection reactor 31 does not exit, and when the non-terminal voltage signal of power supply network is lower than standard voltage value, shunt reactor 31 is exited, and issues
21 fault alarm signal of SVG device；
(2) when shunt reactor 31 because ontology or protection control loop break down when tripping, SVG device 21 will not be at once
Tripping, SVG control system can detect the non-terminal voltage signal of power supply network, when power supply network shows that terminal voltage signal is higher than standard voltage value
When, SVG exports lagging reactive power and stablizes end voltage, until SVG maximum output capacity, when power supply network shows that terminal voltage signal is low
When standard voltage value, SVG exports capacitive reactive power and stablizes end voltage, until SVG maximum output capacity.Issue electricity in parallel
Anti- 31 fault alarm signal of device.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (6)
1. a kind of end Network Voltage Stability system, which is characterized in that including control unit (1), SVG branch (2), multichannel reactance
Device branch (3) and voltage detecting part (5) for detecting end network voltage, the SVG branch (2) and multichannel Reactor Branch
(3) parallel with one another to access in the power grid of end, SVG device (21), the Reactor Branch are provided in the SVG branch (2)
(3) it is provided with reactor (31), is provided in the SVG branch (2) and each Reactor Branch (3) for detecting corresponding branch in
The current detecting part (23) of road electric current and switch (24) for controlling corresponding branch on-off, the voltage detecting part (5) with
Described control unit (1) the end mains voltage signal for will test that is connected is sent to control unit (1), described control unit
(1) it is connected with the switch (24), is each for being controlled according to the difference between end mains voltage signal and preset standard voltage
The on-off of (24) is switched to realize the switchings of corresponding Reactor Branch (3), described control unit (1) and the SVG device (21)
It is connected with each current detecting part (23), for controlling the work of the SVG device (21) according to each current detecting part (23) with flat
Weigh end network voltage.
2. Network Voltage Stability system in end according to claim 1, which is characterized in that series connection in the SVG branch (2)
There is soft charge unit, for the precharge before SVG device (21) starting, the soft charge unit is parallel with shorting switch.
3. Network Voltage Stability system in end according to claim 1 or 2, which is characterized in that the SVG branch (2) and
FV arrester is provided in Reactor Branch (3), for carrying out overvoltage protection.
4. Network Voltage Stability system in end according to claim 1 or 2, which is characterized in that the SVG branch (2) and
It is connected by feeder breaker (4) with end power grid after multichannel Reactor Branch (3) is in parallel.
5. Network Voltage Stability system in end according to claim 1 or 2, which is characterized in that the Reactor Branch (3)
Quantity be two-way.
6. a kind of control method based on Network Voltage Stability system in end described in any one of claim 1 to 5, special
Sign is that the voltage detecting part (5) is in real time acquired the voltage of end power grid and is sent to control unit (1), described
Control unit (1) compares the voltage signal of acquisition and preset standard voltage signal, calculates voltage difference and required
The reactive capability of output, described control unit (1) controls the switch (24) of each Reactor Branch (3) according to comparing result, with reality
The now switching of each Reactor Branch (3)；Each current detecting part (23) detects the electric current of corresponding branch and is sent to current signal
Control unit (1), described control unit (1) control SVG device (21) output lagging reactive power or appearance according to each current signal
Property reactive power；
When the voltage signal of the voltage detecting part (5) acquisition is greater than preset standard voltage, described control unit (1) control is each
(24) closure is switched, so that each Reactor Branch (3) puts into and exports lagging reactive power；Described control unit (1) is according to each
Current detecting part (23) calculates the lagging reactive power of each Reactor Branch (3) output, when the sense of each Reactor Branch (3) output
Property reactive power meet needed for reactive capability when, the SVG device (21) does not start, otherwise SVG device (21) starting to mend
Lagging reactive power is filled so that end mains voltage signal is stablized to preset standard voltage value；
When the voltage signal of the voltage detecting part (5) acquisition is less than preset standard voltage, described control unit (1) control is each
(24) are switched to disconnect to cut off each Reactor Branch (3)；Described control unit (1) controls SVG device (21) starting output capacitive
Reactive power compensates end network voltage, so that it is stablized to preset standard voltage value.
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| CN108390364A (en) * | 2018-05-04 | 2018-08-10 | 安徽徽电科技股份有限公司 | A kind of overhead transmission line end overvoltage inhibiting apparatus |
| CN108808686B (en) * | 2018-07-11 | 2022-04-12 | 云南电网有限责任公司电力科学研究院 | Self-adaptive voltage-regulating and setting algorithm for distribution feeder |
| CN112803432B (en) * | 2019-11-13 | 2022-07-22 | 南京南瑞继保电气有限公司 | One-key sequential control starting and stopping method for magnetic control type parallel reactor |
| CN112186773A (en) * | 2020-09-17 | 2021-01-05 | 中国神华能源股份有限公司神朔铁路分公司 | Traction power supply network tail end voltage stabilizing device and traction power supply network stabilizing system |
| CN112290541A (en) * | 2020-10-15 | 2021-01-29 | 西安热工研究院有限公司 | Method for setting shunt reactor in black start process |
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| CN104901321A (en) * | 2015-05-29 | 2015-09-09 | 株洲变流技术国家工程研究中心有限公司 | Long-distance cable power transmission and distribution network voltage control system |
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