CN108963988A - A kind of loop network control device and power distribution network - Google Patents
A kind of loop network control device and power distribution network Download PDFInfo
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- CN108963988A CN108963988A CN201810662905.3A CN201810662905A CN108963988A CN 108963988 A CN108963988 A CN 108963988A CN 201810662905 A CN201810662905 A CN 201810662905A CN 108963988 A CN108963988 A CN 108963988A
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- 230000008878 coupling Effects 0.000 claims abstract description 40
- 238000010168 coupling process Methods 0.000 claims abstract description 40
- 238000005859 coupling reaction Methods 0.000 claims abstract description 40
- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 80
- 238000007363 ring formation reaction Methods 0.000 claims description 25
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
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- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
Abstract
The invention discloses a kind of loop network control device and power distribution networks, the loop network control device includes: series connection inverter, parallel inverter, series connection converter Control module, parallel inverter control module, first capacitor and coupling transformer, parallel inverter and inverter of connecting are in parallel, first capacitor is connected between parallel inverter and inverter of connecting, the first input end of the first tap connection parallel inverter of coupling transformer primary side；Second input terminal of the first tap connection series connection inverter on coupling transformer pair side；Converter Control module of connecting obtains the first input data of loop network control device, generates the regulating command to input electrical signal according to the first input data；Parallel inverter control module obtains the measurement voltage of coupling transformer, generates the control instruction to parallel inverter according to measurement voltage, parallel inverter is made to provide series connection inverter or absorb active power and reactive power.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of loop network control device and power distribution network.
Background technique
Power distribution network is in the end of entire electric system, is directly facing power consumer, carries distribution electric energy, services client
Etc. important tasks.Currently, distribution network construction relatively lag behind, control measures it is limited, constrain power distribution network operation control flexibility, cause
The problems such as feeder load is unbalanced, service restoration time is long.On the other hand, non-linear, impact load in power distribution network
The increase of specific gravity and the continuous improvement of new energy permeability, to the safeguard mean of distribution network electric energy quality and power supply reliability
Propose requirements at the higher level.Conventional AC distribution web frame can no longer meet power distribution network power-supplying forms multiplicity, energy bidirectional flow
Dynamic, trend active control and reliability demand.
Looped network finger ring shape power distribution network, i.e. supply main form the annular of a closure, each distribution branch both can be by
Its left side main line takes power supply, and can take power supply by its right side main line.When left side, main line is out of order, negative in left branch
Lotus can continue to be powered from right side main line；And when right side main line is out of order, the load in right branch can be from left side main line
Continue to be powered, it can be seen that, Electromagnetic coupling can effectively improve the reliability and flexibility of power supply, can effectively meet existing
Safeguard mean requirement of the power distribution network for power quality and power supply reliability.
However currently, there are some problems if two feeder lines, which are carried out cyclization, in power distribution network forms looped network.Due to cyclization
Point both ends are there are voltage difference before cyclization, and when cyclization can generate very big dash current, and there are the circulation of electromagnetic looped network after cyclization；
The malfunction that may also cause relay protection in power distribution network is impacted in the cyclization, causes failure；And scene Loop Closing Operation be all
Judge under the experience guidance of operations staff, there are very high randomnesss for the result of Loop Closing Operation, may be to relevant device
It causes a hidden trouble with the safety of operator；And Loop Closing Operation usually takes a long time.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of loop network control device and power distribution network, to solve in existing power distribution network
The poor problem of safety caused by the cyclization of artificial Loop Closing Operation and generation existing for two independent feeder Electromagnetic couplings is impacted.
According in a first aspect, the embodiment of the invention provides a kind of loop network control devices, comprising: series connection inverter, parallel connection are changed
Flow device, series connection converter Control module, parallel inverter control module, first capacitor and coupling transformer, the parallel connection change of current
Device is connected between the parallel inverter and the inverter of connecting with the inverter parallel connection of connecting, the first capacitor,
First tap of the coupling transformer primary side connects the first input end of the parallel inverter；Coupling transformer pair side
The first tap connect it is described series connection inverter the second input terminal；The series connection converter Control module obtains the looped network control
First input data of device processed generates the regulating command to the input electrical signal according to first input data；It is described simultaneously
Connection converter Control module obtains the measurement voltage of the coupling transformer, is changed according to measurement voltage generation the parallel connection
The control instruction for flowing device, makes the parallel inverter provide the series connection inverter or absorb active power and reactive power.
The loop network control device of the embodiment of the present invention carries out cyclization, reduces cyclization impact, realize series connection inverter with simultaneously
Join the Loop Closing Operation between inverter, and charge back brake during can realizing Loop Closing Operation and load does not have a power failure and turns to supply, to realize weight
It wants the customization of load to power, uninterrupted safe transfer, improves important load power supply reliability.
With reference to first aspect, in first aspect first embodiment, the first input data includes: the loop network control device
Input electrical signal and input electric power；The series connection converter Control module includes: input parameter acquisition module, for obtaining
Take the input electrical signal and input electric power of the loop network control device；First comparing result generation module, being used for will be described defeated
Enter electrical power to compare with the first preset value, generates the first comparing result；Regulating command generation module, for according to described the
One comparison is as a result, generate the regulating command to the input electrical signal.
With reference to first aspect, in first aspect second embodiment, the parallel inverter control module includes: voltage
Module is obtained, for obtaining the both end voltage of the coupling transformer original edge voltage or secondary voltage and the first capacitor；
Comparing result generation module, for respectively by the coupling transformer original edge voltage or secondary voltage and the second preset value or third
Preset value compares, and generates the second comparing result, the both end voltage of the first capacitor and the 4th preset value are compared,
Generate third comparing result；Control instruction generation module, for generating according to second comparing result and third comparing result
To the control instruction of the parallel inverter.
With reference to first aspect or first aspect any one embodiment, described in first aspect third embodiment
Series connection inverter and parallel inverter are controllably to open the three-phase bridge inverter that shutdown power electronic devices forms by six,
And each shutdown equal reverse parallel connection of power electronic devices of controllably opening has diode.
With reference to first aspect or first aspect any one embodiment, described in the 4th embodiment of first aspect
Coupling transformer includes: multiple windings, wherein the first winding and the second windings in series simultaneously constitute three taps, the 4th winding and the
Five windings in series simultaneously constitute three taps, the 7th winding and the 8th windings in series and constitute three taps, constitute 3-phase autotransformer,
The 3-phase autotransformer primary side is connected with the alternating current circuit of power distribution network, and secondary side exchanges side with the parallel inverter
It is connected.
4th embodiment with reference to first aspect, in the 5th embodiment of first aspect, the 3-phase autotransformer
Every phase neutral point interconnection, after interconnection ground connection or resistance grounded.
4th embodiment with reference to first aspect, in first aspect sixth embodiment, the coupling transformer is also wrapped
Include: the first phase winding, the second phase winding, third phase winding, the first side winding with the 3-phase autotransformer has magnetic respectively
Coupling is constituted using the 3-phase autotransformer primary side as primary side, the three-phase transformer that each winding is secondary side, three phase transformation
The primary side of depressor is connected with the alternating current circuit of the power distribution network, and secondary survey is connected with the side that exchanges of the series connection inverter.
With reference to first aspect, in the 7th embodiment of first aspect, the loop network control device further include: by-pass switch, and
It is coupled to the first side of the series connection inverter；The series connection converter Control module obtains the load voltage and the string of power distribution network
Whether the input voltage for joining inverter judges the load voltage of the power distribution network in preset threshold range and the series connection change of current
Whether the input voltage of device is more than the 5th preset value；When the load voltage of the power distribution network is in the preset threshold range or institute
When stating the input voltage of series connection inverter more than five preset value, the series connection converter Control module controls the bypass
It closes the switch, the series connection converter blocking；When the load voltage of the power distribution network is more than the preset threshold range and described
When the input voltage of series connection inverter is less than five preset value, the series connection converter Control module controls the bypass
Switch is opened, and the series connection inverter is exported according to the regulating command adjusts voltage to the first alternating current circuit of the power distribution network
Or second alternating current circuit, the load voltage of the power distribution network is adjusted.
7th embodiment with reference to first aspect, in the 8th embodiment of first aspect, the loop network control device further include:
Disconnect switch is series between the first side of the parallel inverter and first alternating current circuit；The parallel inverter control
Molding block obtains the input voltage of the parallel inverter, judges whether the input voltage of the parallel inverter is pre- more than the 6th
If value；When the input voltage of the parallel inverter is more than six preset value, the parallel inverter control module control
It makes the disconnect switch to disconnect, the parallel inverter locking；When the input voltage of the parallel inverter is less than described
When six preset values, the parallel inverter control module controls the disconnect switch closure, keeps the parallel inverter and institute
State the electrical connection of the first alternating current circuit of power distribution network.
8th embodiment with reference to first aspect, in the 9th embodiment of first aspect, the loop network control device further include:
First filter is parallel between the series connection inverter and the by-pass switch, for input or export it is described series connection change
The electric signal of stream device is filtered；Second filter is parallel between the parallel inverter and the disconnect switch, for pair
The electric signal for inputting or exporting the parallel inverter is filtered.
9th embodiment with reference to first aspect, in the tenth embodiment of first aspect, the first filter and
Two filters are passive filter.
According to second aspect, the embodiment of the invention provides a kind of power distribution networks characterized by comprising such as first aspect
Or loop network control device described in first aspect any one embodiment, the loop network control device are serially connected with the conjunction of the power distribution network
Circling point, the side of the cyclization point are the first alternating current circuit of the power distribution network, and the other side is the second exchange of the power distribution network
Route.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 shows the structural schematic diagram of the loop network control device of the embodiment of the present invention；
Fig. 2 shows the structural schematic diagrams of the coupling transformer of the embodiment of the present invention；
Fig. 3 A- Fig. 3 E shows the structural schematic diagram of the power distribution network of the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of loop network control devices, as shown in Figure 1, the loop network control device specifically includes that series connection
Inverter 10, parallel inverter 20, series connection converter Control module 11, parallel inverter control module 21, first capacitor CdcAnd
Coupling transformer 30.
Wherein, parallel inverter 20 and inverter 10 of connecting are in parallel, first capacitor CdcIt is connected to parallel inverter 20 and string
Join between inverter 10, the first input end of the first tap connection parallel inverter 20 of 30 primary side of coupling transformer；Coupling becomes
Second input terminal of the first tap connection series connection inverter 10 on the secondary side of depressor 30.
Converter Control module 11 of connecting obtains the first input data of loop network control device, is generated according to the first input data
Regulating command to input electrical signal.
Optionally, in some embodiments of the invention, the first input number acquired in series connection converter Control module 11
According to the input electrical signal and input electric power for including: loop network control device.The series connection converter Control module 11 can include: input
Parameter acquisition module, for obtaining the input electrical signal and input electric power of loop network control device；First comparing result generates mould
Block, for (wherein, which to be magnitude of power, the i.e. desired value of power, example by input electric power and the first preset value
Such as, it is expected that it is 3MW that series side, which exports active, then first preset value is 3MW) it compares, generate the first comparing result；It adjusts
Directive generation module is saved, for generating the regulating command to input electrical signal according to the first comparing result.
The series connection converter Control module 11 with loop network control device two sides voltage, flow through the route of loop network control device access point
Active power and reactive power are input quantity, and using desired active and reactive power as command quantity, control series connection inverter 10 is generated
The series voltage of desired amplitude and phase, the tune of the voltage control and system load flow after cyclization at cyclization point both ends when for cyclization
Section.
Above-mentioned parallel inverter control module 21 obtains the measurement voltage of coupling transformer 30, is generated according to measurement voltage
To the control instruction of parallel inverter 20,20 pairs of series connection inverters 10 of parallel inverter is made to provide or absorb active power and idle
Power.Specifically, which includes: that voltage obtains module, for obtaining 30 primary side of coupling transformer
Voltage or secondary voltage and first capacitor CdcBoth end voltage；Comparing result generation module, for respectively by coupling transformer
30 original edge voltages or secondary voltage and the second preset value or third preset value (wherein, second preset value, third preset value, that is, table
Show the desired value of the original edge voltage and secondary voltage, for example, the desired value of original edge voltage is 10kV, then second preset value is arranged
It is compared for 10kV), the second comparing result is generated, by first capacitor CdcBoth end voltage and the 4th preset value (the 4th is pre-
If value is to indicate the desired value of the first capacitor both end voltage, and its needs is determined according to transformer voltage ratio) it compares, it generates
Third comparing result；Control instruction generation module, for according to the second comparing result and third comparing result, parallel connection to be changed in generation
Flow the control instruction of device 20.
The parallel inverter control module 21 is with auto-transformer primary side voltage or secondary side voltage, DC voltage UdcFor
Input quantity, using desired system voltage, DC voltage as command quantity, control parallel inverter 20 provide or absorb active power and
Reactive power provides energy for series connection inverter 10 and supports, and carries out reactive compensation to power grid.
Optionally, in some embodiments of the invention, as shown in Figure 1, the series connection inverter 10 and parallel inverter 20
Controllably to open the three-phase bridge inverter that shutdown power electronic devices forms by six, and each controllably open shutdown electric power
The equal reverse parallel connection of electronic device has diode.
Optionally, in some embodiments of the invention, as shown in Fig. 2, coupling transformer 30 includes: that A, B, C three-phase are each
There are three winding, three windings of A phase are respectively the first winding 1, the second winding 2 and the tertiary winding 3, and B phase is respectively the 4th
Winding 4, the 5th winding 5, the 6th winding 6, C phase are the 7th winding 7, the 8th winding 8, the 9th winding 9.
Wherein, the first winding 1 is connected with the second winding 2, and the tie point of the first winding 1 and the second winding 2 is picked out lead,
Constitute third tap A1, one end a of the first winding 1 is as the first tap, and one end of the second winding 2 is as the second tap, access
To interconnection point n；4th winding 4 is connected with the 5th winding 5, and the 4th winding 4 is picked out with the concatenated tie point of the 5th winding 5 and is drawn
Line constitutes third tap A2, as the first tap, one end of the 5th winding 5 connects one end c of the 4th winding 4 as the second tap
Enter to interconnection point n；7th winding 7 is connected with the 8th winding 8, and the tie point of the 7th winding 7 and the 8th winding 8 is picked out lead,
Constitute third tap A3, one end b of the 7th winding 7 is as the first tap, and one end of the 8th winding 8 is as the second tap, access
To interconnection point n, to constitute 3-phase autotransformer, 3-phase autotransformer primary side is connected with the alternating current circuit of power distribution network,
Secondary side is connected with the side that exchanges of the parallel inverter 20.Also, each phase neutral point of the 3-phase autotransformer interconnects, mutually
Ground connection or resistance grounded after connection.
In A phase, one end of the first winding 1 is connected with the second winding 2, the first winding 1 and power distribution network alternating current circuit after series connection
It is connected, the second winding 2 exchanges side with parallel inverter 20 and is connected.The tertiary winding 3 with connect after the first winding 1, the second winding 2
There is magnetic coupling, the tertiary winding 3 exchanges side with series connection inverter 10 and is connected after coupling.In B phase, one end and the 5th of the 4th winding 4
Winding 5 is connected, and the 4th winding 4 is connected with power distribution network alternating current circuit after series connection, and the 5th winding 5 exchanges side phase with parallel inverter 20
Even, the 6th winding 6 with connect after the 4th winding 4, the 5th winding 5 have magnetic coupling, the 6th winding 6 and inverter of connecting after coupling
10 exchange sides are connected.In C phase, one end of the 7th winding 7 is connected with the 8th winding 8, and the 7th winding 7 is exchanged with power distribution network after series connection
Route is connected, and the 8th winding 8 exchanges that side is connected with parallel inverter 20, the 9th winding 9 with connect after the 7th winding the 7, the 8th
Winding 8 has magnetic coupling, and the 9th winding 9 exchanges side with series connection inverter 10 and is connected after coupling.
The winding of above-mentioned A, B, C phase has magnetic coupling with the first side winding of 3-phase autotransformer respectively, constitutes with three-phase
Auto-transformer primary side is primary side, the three-phase transformer that each winding is secondary side, the primary side of three-phase transformer and power distribution network
Alternating current circuit is connected, and secondary survey is connected with the side that exchanges of series connection inverter 10.
Optionally, in order to realize that loop network control device is adjusted in the load voltage to series connection inverter 10, the present invention is real
The loop network control device for applying example is also provided with by-pass switch KS, as shown in Figure 1, by-pass switch KSIt is parallel to series connection inverter 10
Side.
Converter Control module 11 of connecting obtains the load voltage of power distribution network and the input voltage of series connection inverter 10, judgement
Whether the load voltage of power distribution network is in preset threshold range and whether the input voltage of series connection inverter 10 is default more than the 5th
(wherein, the 5th preset value is the desired value for indicating the input voltage of the series connection inverter 10 to value, to the desired value of input voltage
For how many when, then corresponding numerical value is set by the 5th preset value, the present invention is not limited thereto)；When the load of power distribution network
Voltage is in preset threshold range or when the input voltage of series connection inverter 10 is more than five preset values, converter Control mould of connecting
Block 11 controls by-pass switch KSClosure, series connection inverter 10 are latched；When power distribution network load voltage be more than preset threshold range and
When the input voltage of series connection inverter 10 is less than five preset values, series connection converter Control module 11 controls by-pass switch KSIt beats
It opens, series connection inverter 10 is exported according to regulating command adjusts voltage to the first alternating current circuit or the second alternating current circuit of power distribution network,
The load voltage of power distribution network is adjusted.
When it is implemented, by-pass switch KSIt can be two switch in parallel, one wire form, three switch in parallel can also be used
Form, the present invention is not limited thereto.
Optionally, in order to be protected according to the input voltage of parallel inverter 20 to parallel inverter 20, the present invention is real
The loop network control device for applying example is also provided with disconnect switch Kp, as shown in Figure 1, disconnect switch KpIt is series at parallel inverter 20
The first side and the first alternating current circuit between, construct breakpoint.
Parallel inverter control module 21 obtains the input voltage of parallel inverter 20, judges the input of parallel inverter 20
Whether voltage is more than the 6th preset value；When the input voltage of parallel inverter 20 is more than that (wherein, the 6th is default for the 6th preset value
Value is to indicate the desired value of the input voltage of the parallel inverter 20, is how many when to the desired value of input voltage, then by this
Six preset values are set as corresponding numerical value, and the present invention is not limited thereto) when, parallel inverter control module 21 controls open circuit and opens
Close KpIt disconnects, parallel inverter 20 is latched；When the input voltage of parallel inverter 20 is less than six preset values, the change of current in parallel
Device control module 21 controls disconnect switch KpClosure keeps parallel inverter 20 to connect with the electrical of the first alternating current circuit of power distribution network
It connects.
Optionally, in some embodiments of the invention, which is also provided with first filter 40 and
Two filters 50, as shown in Figure 1, first filter 40 is parallel to series connection inverter 10 and by-pass switch KSBetween, for defeated
The electric signal for entering or exporting series connection inverter 10 is filtered；Second filter 50 is parallel to parallel inverter 20 and disconnect switch
KpBetween, for being filtered to the electric signal of input or output-parallel inverter 20.In practical applications, LC filtering can be selected
Any passive filters such as device, LCL filter, LR filter are as the first filter 40 and second filter 50, this hair
It is bright to be not limited thereto.
The embodiment of the present invention also provides a kind of power distribution network, which includes loop network control described in above-mentioned any embodiment
Device, the loop network control device are serially connected with the cyclization point of power distribution network, and the side of cyclization point is the first alternating current circuit of power distribution network, the other side
For the second alternating current circuit of power distribution network.
It specifically, include 10kV substation (A in the power distribution network1、B1), load (A2、A3、B2、B3), cable, breaker
(S1-S5, S1’-S5'), arrester (Ar1、Ar2) and the loop network control device.
1) when the loop network control device does not put into power distribution network, Liang Ge 10kV substation (A1、B1) it is respectively institute on respective route
On-load power supply, as shown in Figure 3A.At this point, direct cyclization can generate dash current, therefore not due to there are biggish voltage difference
Allow direct Electromagnetic coupling.Cyclization is carried out by loop network control device, the series connection inverter of loop network control device can be adjusted before cyclization
10 output voltage keeps dash current when cyclization sufficiently small, meets cyclization condition, and the power distribution network after cyclization is as shown in Figure 3B.
2) after loop network control device investment power distribution network, when power distribution network operates normally, loop network control device be adjusted its two
The power of end line.Such as substation A1The load A of institute's band2、A3Much larger than substation B1The load B of institute's band2、B3, can pass through at this time
Loop network control device regulation power, makes substation B1For A2、A3Corresponding power is provided, to reduce substation A1The function of required offer
Rate extenuates A after cyclization1Heavy duty, B1The case where underloading.
3) when the loop network control device adjusts trend, the active and reactive trend for 10 adjusting circuit of inverter of connecting.Parallel connection is changed
Stream device 20 can also provide reactive power, realize compensating on the spot, nearby for reactive power, reduce line loss.
4) after the loop network control device investment power distribution network, as substation A1When out of service due to maintenance etc., distribution
Net switchs to substation B1For B2、B3、A3、A2The single ended power supply powering mode of power supply.In this way, then there may be power supply end load A2
And A3The brownout at place is excessively high, that is, has the problem of voltage deviation is more than the prescribed limit of national standard.By loop network control
Device can raise or lower A to power grid injecting voltage2、A3Locate voltage, realizes the effect that loop network control device adjusts network voltage.
5) after the loop network control device investment power distribution network, when power distribution network switchs to substation B1For B2、B3、A3、A2The list of power supply
When holding power supply powering mode, if power supply end load A2And A3The voltage deviation at place is less than the range of national Specification, at this time
Loop network control device can not be to power grid injecting voltage, lockable series connection inverter 10, combined floodgate by-pass switch Ks, reduce loop network control device
Loss.
6) substation A1Side S1And S2Between certain line failure, failure continue during, if line current is larger, flow through
The electric current of series connection inverter 10 is greater than the setting valve of its own protective device, and as shown in Figure 3 C, series connection inverter 10 is latched, bypass
Switch KsIt closes a floodgate.If parallel inverter 20, which bears voltage, is greater than its protective device setting valve, parallel inverter 20 is latched, and open circuit is opened
Close KpSeparating brake.
7) the relay protection judgement of route is out of order and fault point, makes breaker S1And S2It disconnects, failure is removed, and is such as schemed
Shown in 3D.If 10 overcurrent of inverter of connecting during failure locking, after failure removal, series connection inverter controller detects line fault
It is removed, the unlock of series connection inverter 10, by-pass switch KsSeparating brake.
If 8) 20 over-voltage of parallel inverter is latched during failure, after failure removal, inverter controller in parallel detects route
Failure is removed, the unlock of parallel inverter 20, disconnect switch KpIt closes a floodgate.
9) substation A1Side S1And S2Between certain line failure, failure continue during, as flow through series connection inverter 10
Electric current is less than the setting valve of its own protective device, then inverter 10 of connecting exports single voltage by corresponding instruction, is not latched,
Do not close a floodgate by-pass switch Ks；If parallel inverter 20, which bears voltage, is less than its protective device setting valve, parallel inverter 20 is latched,
But it is not necessarily to separating brake disconnect switch Kp。
If 10) inverter 10 of connecting during failure is pressed instructs output voltage accordingly, after failure removal, series connection change of current control
Device detects that line fault is removed, and series connection inverter 10 stops output and specifies single voltage, restores normal operating conditions.
11) if parallel inverter 20 is latched during failure, but non-separating brake disconnect switch Kp, after failure removal, the change of current in parallel
Controller detects that line fault is removed, and parallel inverter 20 unlocks.
12) route encounters lightning stroke on the left of near loop network control device, as shown in FIGURE 3 E, arrester Ar1After detecting thunder and lightning
The huge overcurrent that thunder and lightning generates is directly grounded by movement by its own, at this time not by coming from left side in loop network control device
Thunder and lightning overcurrent, is isolated, system is restored to substation B before cyclization with faulty line caused by being struck by lightning1For B2、B3Single-ended power
State, loop network control device can be out of service, reduce loss.
Although being described in conjunction with the accompanying the embodiment of the present invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case where various modifications and variations can be made, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (12)
1. a kind of loop network control device characterized by comprising series connection inverter, parallel inverter, series connection converter Control mould
Block, parallel inverter control module, first capacitor and coupling transformer,
The parallel inverter and it is described connect inverter parallel connection, the first capacitor be connected to the parallel inverter with it is described
It connects between inverter, the first tap of the coupling transformer primary side connects the first input end of the parallel inverter；Institute
The first tap for stating coupling transformer pair side connects the second input terminal of the series connection inverter；
The series connection converter Control module obtains the first input data of the loop network control device, according to the first input number
According to the regulating command generated to the input electrical signal；
The parallel inverter control module obtains the measurement voltage of the coupling transformer, according to measurement voltage generation pair
The control instruction of the parallel inverter, make the parallel inverter series connection inverter is provided or is absorbed active power and
Reactive power.
2. loop network control device according to claim 1, which is characterized in that first input data includes: the looped network
The input electrical signal and input electric power of controller；The series connection converter Control module includes:
Parameter acquisition module is inputted, for obtaining the input electrical signal and input electric power of the loop network control device；
First comparing result generation module generates first pair for comparing the input electric power and the first preset value
Compare result；
Regulating command generation module, for generating the regulating command to the input electrical signal according to first comparing result.
3. loop network control device according to claim 1, which is characterized in that the parallel inverter control module includes:
Voltage obtains module, for obtaining the two of the coupling transformer original edge voltage or secondary voltage and the first capacitor
Hold voltage；
Comparing result generation module, for respectively by the coupling transformer original edge voltage or secondary voltage and the second preset value or
Third preset value compares, and generates the second comparing result, and the both end voltage of the first capacitor and the 4th preset value are carried out
Comparison generates third comparing result；
Control instruction generation module, for according to second comparing result and third comparing result, the parallel connection to be changed in generation
Flow the control instruction of device.
4. loop network control device according to any one of claim 1-3, which is characterized in that the series connection inverter and parallel connection
Inverter is controllably to open the three-phase bridge inverters that form of shutdown power electronic devices by six, and each described controllably open
The disconnected equal reverse parallel connection of power electronic devices of clearance has diode.
5. loop network control device according to any one of claim 1-3, which is characterized in that the coupling transformer includes:
Multiple windings, wherein
First winding and the second windings in series simultaneously constitute three taps, the 4th winding and the 5th windings in series and three taps of composition, the
Seven windings and the 8th windings in series simultaneously constitute three taps, constitute 3-phase autotransformer, the 3-phase autotransformer primary side
It is connected with the alternating current circuit of power distribution network, secondary side is connected with the side that exchanges of the parallel inverter.
6. loop network control device according to claim 5, which is characterized in that every phase neutral point of the 3-phase autotransformer
Interconnection, ground connection or resistance grounded after interconnection.
7. loop network control device according to claim 5, which is characterized in that the coupling transformer further include:
First phase winding, the second phase winding, third phase winding, the first side winding with the 3-phase autotransformer has magnetic respectively
Coupling is constituted using the 3-phase autotransformer primary side as primary side, the three-phase transformer that each winding is secondary side, three phase transformation
The primary side of depressor is connected with the alternating current circuit of the power distribution network, and secondary survey is connected with the side that exchanges of the series connection inverter.
8. loop network control device according to claim 1, which is characterized in that further include: by-pass switch is parallel to the series connection
First side of inverter；
The series connection converter Control module obtains the load voltage of power distribution network and the input voltage of the series connection inverter, judgement
Whether the load voltage of the power distribution network is in preset threshold range and whether the input voltage of the series connection inverter is more than the
Five preset values；
When the power distribution network load voltage in the preset threshold range or it is described series connection inverter input voltage be more than
When five preset value, the series connection converter Control module controls the by-pass switch closure, and the series connection inverter closes
Lock；
When the load voltage of the power distribution network does not surpass more than the input voltage of the preset threshold range and the series connection inverter
When crossing five preset value, the series connection converter Control module controls the by-pass switch and opens, the series connection inverter
It is exported according to the regulating command and adjusts voltage to the first alternating current circuit or the second alternating current circuit of the power distribution network, matched to described
The load voltage of power grid is adjusted.
9. loop network control device according to claim 8, which is characterized in that further include: disconnect switch is series at the parallel connection
Between first side of inverter and first alternating current circuit；
The parallel inverter control module obtains the input voltage of the parallel inverter, judges the defeated of the parallel inverter
Whether enter voltage more than the 6th preset value；
When the input voltage of the parallel inverter is more than six preset value, the parallel inverter control module control
The disconnect switch disconnects, the parallel inverter locking；
When the input voltage of the parallel inverter is less than six preset value, the parallel inverter control module control
The disconnect switch closure is made, the electrical connection of the first alternating current circuit of the parallel inverter and the power distribution network is kept.
10. loop network control device according to claim 9, which is characterized in that further include:
First filter is parallel between the series connection inverter and the by-pass switch, for inputting or export the string
The electric signal of connection inverter is filtered；
Second filter is parallel between the parallel inverter and the disconnect switch, for described simultaneously to input or output
The electric signal of connection inverter is filtered.
11. loop network control device according to claim 10, which is characterized in that the first filter and second filter are
Passive filter.
12. a kind of power distribution network characterized by comprising described such as loop network control device of any of claims 1-11
Loop network control device is serially connected with the cyclization point of the power distribution network, and the side of the cyclization point is the first AC line of the power distribution network
Road, the other side are the second alternating current circuit of the power distribution network.
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| CN201810662905.3A CN108963988B (en) | 2018-06-25 | 2018-06-25 | Looped network controller and power distribution network |
| PCT/CN2018/095854 WO2020000528A1 (en) | 2018-06-25 | 2018-07-16 | Ring network controller and power distribution network |
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| WO2021022949A1 (en) * | 2019-08-02 | 2021-02-11 | 全球能源互联网研究院有限公司 | Looped network controller and control method |
| WO2024051839A1 (en) * | 2022-09-08 | 2024-03-14 | 国网智能电网研究院有限公司 | Power supply tie transformer, and regulation and control method therefor |
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| CN108963988B (en) | 2024-01-16 |
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