CN109638829A - 10kV power distribution network turns electric installation without suture ring - Google Patents
10kV power distribution network turns electric installation without suture ring Download PDFInfo
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Abstract
This application involves a kind of 10kV power distribution networks to turn electric installation without suture ring, and the DC side of series voltage compensator is connected with the DC side of shunt voltage converter；Each phase in series voltage compensator includes series coupled transformer and single-phase electricity potential source code converter；Shunt voltage converter includes shunt transformer and three-phase voltage source code converter；Every group of series voltage compensator, which is used to connect, to be accessed one group of feeder line and compensates the system voltage of two groups of feeder lines in opposite directions.In this way; pass through two feeder lines of series connection access different electrical power; accuracy independent of cyclization Equivalent Model; eliminate the circulation generated during cyclization; it avoids causing cyclization risk caused by apparatus overload, false protection etc. because closed loop power flow is excessive, reduces management and running personnel and micro-judgment bring power grid security risk is made to inconsiderable, immesurable closed loop network, reduce the uncertainty of Loop Closing Operation; the success rate that cyclization turns electricity is improved, the reliability of area power grid power supply is further strengthened.
Description
Technical field
This application involves 10kV closed loop networks to turn electrical domain, and in particular to a kind of 10kV power distribution network for eliminating Alloy White Iron
No suture ring turns electric installation.
Background technique
As the epoch constantly advance, the electricity needs for meeting people's pursuit good life becomes power supply enterprise's work gradually
The starting point and standpoint of work.Become in the links such as adapted sending out defeated, distribution network construction relatively lags behind, but as power supply enterprise services
The enhancing of consciousness and highlighting for electricity commodity attribute, distribution investment expand year by year, and the reliability of user power utilization is even satisfied
Degree is more and more paid attention to.The last one link of power distribution network as electric system, directly affects the power supply quality of user,
Particularly evident, power supply enterprise's palpus strict control power off time and frequency of power cut are influenced on daily life.
In view of factors such as short circuit currents, domestic power distribution network follows closed loop design, the principle of open loop operation, load usually by
Single power supply power supply, different power supply institutes between region for using interconnection switch to be isolated.In distribution actual production operational process, inspection
It repairs equipment or feeder load peak period is fully loaded, can usually consider that cyclization turns electricity.Cyclization turns electricity, and there is no first stop to turn confession again
Power failure gap, but turn electric mode according to cyclization, electric network swim distribution when cyclization are related to system real-time operating condition, it is difficult to
Involutive ring turns risk and carries out network analysis, easily causes judgment bias, and the result of practical operation has randomness.If closed loop power flow
It is excessive, apparatus overload will be caused, protective relaying maloperation, short circuit current is exceeded, and electromagnetic looped network causes the risks such as fault spread.
The method for establishing cyclization Equivalent Model is mostly used at present, calculates trend, and then assess cyclization risk.Whether economical
Property assessment or technical assessment, be all that whether a kind of judgement in range can received to circulation value before cyclization, can not eliminate
Circulation.
Summary of the invention
Based on this, it is necessary to provide a kind of 10kV power distribution network without suture ring and turn electric installation.
A kind of 10kV power distribution network turns electric installation without suture ring comprising series voltage compensator and shunt voltage converter,
The DC side of the series voltage compensator is connected with the DC side of the shunt voltage converter；The series voltage compensator
For realizing phase splitting compensation, each phase in the series voltage compensator includes series coupled transformer and single-phase electricity potential source
Code converter；The shunt voltage converter includes shunt transformer and three-phase voltage source code converter；Also, the 10kV matches
It includes series voltage compensator described in two groups that power grid, which turns electric installation without suture ring, and series voltage compensator described in every group is for connecting
It accesses one group of feeder line and compensates the system voltage of two groups of feeder lines in opposite directions.
Above-mentioned 10kV power distribution network turns electric installation without suture ring, by two feeder lines of series connection access different electrical power, does not depend on
In the accuracy of cyclization Equivalent Model, the design of two groups of series voltage compensators is cooperated using shunt voltage converter, is eliminated
The circulation generated during cyclization, avoids causing cyclization wind caused by apparatus overload, false protection etc. because closed loop power flow is excessive
Danger reduces management and running personnel and makees micro-judgment bring power grid security risk to inconsiderable, immesurable closed loop network, subtracts
The uncertainty of few Loop Closing Operation improves the success rate that cyclization turns electricity, further strengthens the reliability of area power grid power supply.
The single-phase electricity potential source code converter is equipped with multiple parallel with one another first and is coupled in one of the embodiments,
Structure and the single-phase electricity potential source code converter are used to inhibit the circulation between converters at different levels.
The single-phase electricity potential source code converter is for coordinating two series voltage compensation in one of the embodiments,
Device is so that compensated system voltage keeps three-phase symmetrical.
The single-phase electricity potential source code converter is also used to according to the real-time system method of operation in one of the embodiments,
The instruction references compensation voltage signal of each single-phase electricity potential source code converter is issued after comprehensive regulation.
The three-phase voltage source code converter is equipped with multiple parallel with one another second and is coupled in one of the embodiments,
Structure and the three-phase voltage source code converter for reducing input current harmonic content.
The shunt voltage converter is separately connected two breakers in one of the embodiments, and the shunt voltage becomes
Parallel operation connects the series voltage compensator by each breaker and is used to connect one group of feeder line.
The shunt transformer uses Y/ delta connection in one of the embodiments,.
The shunt transformer is arranged according to design capacity in one of the embodiments,.
The power distribution network is 10kV power distribution network in one of the embodiments,.
The line that the 10kV power distribution network turns without suture ring electric installation is arranged according to design requirement in one of the embodiments,
Voltage compensation degree, the no-load voltage ratio of the shunt voltage converter, the no-load voltage ratio and DC voltage of the series voltage compensator.
Line voltage compensation degree is 5% in one of the embodiments, and the shunt voltage converter no-load voltage ratio is selected as 10kV/
250V, the series voltage compensator no-load voltage ratio are selected as 250V/250V, and DC voltage is regulated to 500V.
Detailed description of the invention
Fig. 1 is the application framework schematic diagram of one embodiment of the application.
Fig. 2 is the shunt voltage transformer configuration schematic diagram of embodiment illustrated in fig. 1.
Fig. 3 is the single-phase electricity potential source code converter structural schematic diagram of embodiment illustrated in fig. 1.
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing to the application
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this Shen
Please.But the application can be implemented with being much different from other way described herein, those skilled in the art can be not
Similar improvement is done in the case where violating the application intension, therefore the application is not limited by the specific embodiments disclosed below.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be with
It is directly to another element or may be simultaneously present centering elements.Term as used herein " vertically ", " level
", "left", "right" and similar statement for illustrative purposes only, be not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term " and or " used herein includes one or more
Any and all combinations of relevant listed item.
The main target of the application is to provide a kind of no suture ring and turns electric installation, eliminates 10kV closed loop network and turns electric process
Circulation.In one embodiment, a kind of 10kV power distribution network turns electric installation without suture ring comprising series voltage compensator and simultaneously
Join voltage changer, the DC side of the series voltage compensator is connected with the DC side of the shunt voltage converter；It is described
For series voltage compensator for realizing phase splitting compensation, each phase in the series voltage compensator includes series coupled transformation
Device and single-phase electricity potential source code converter；The shunt voltage converter includes shunt transformer and three-phase voltage source code converter；
Also, it includes series voltage compensator described in two groups, series electrical described in every group that the 10kV power distribution network, which turns electric installation without suture ring,
Pressure compensator, which is used to connect, to be accessed one group of feeder line and compensates the system voltage of two groups of feeder lines in opposite directions.Above-mentioned 10kV power distribution network is seamless
Cyclization turns electric installation, is used by two feeder lines of series connection access different electrical power independent of the accuracy of cyclization Equivalent Model
Shunt voltage converter cooperates the design of two groups of series voltage compensators, eliminates the circulation generated during cyclization, avoid because
Closed loop power flow is excessive and cyclization risk caused by causing apparatus overload, false protection etc., reduce management and running personnel to it is inconsiderable,
Immesurable closed loop network makees micro-judgment bring power grid security risk, reduces the uncertainty of Loop Closing Operation, improves and closes
Ring turns the success rate of electricity, further strengthens the reliability of area power grid power supply.
A kind of 10kV power distribution network turns electric installation without suture ring in one of the embodiments, comprising following embodiment
Part-structure or entire infrastructure；That is, the 10kV power distribution network without suture ring turn electric installation include some technical characteristics below or
All technical features.
A kind of 10kV power distribution network turns electric installation, including series voltage compensator without suture ring in one of the embodiments,
And shunt voltage converter.The series voltage compensator uses the principle of phase splitting compensation, and each phase is by series coupled transformer
It is formed with single-phase electricity potential source code converter, the single-phase electricity potential source code converter uses plural parallel stage structure to improve through-flow energy
Power, control strategy can inhibit the circulation between converters at different levels, reduce harmonic wave of output voltage content.The shunt voltage converter
It is made of shunt transformer and three-phase voltage source code converter, the DC side of the series voltage compensator and the shunt voltage
The DC side of converter is connected, and the three-phase voltage source code converter uses plural parallel stage structure to improve through-current capability, controls
System strategy can reduce the harmonic content of input current.The series voltage compensator generates expected offset voltage and system voltage coupling
It closes, realizes the Phaseshift controlling of line voltage distribution.Active power passes through the shunt voltage converter and the series voltage compensator
It circulates, can be absorbed from system by the shunt voltage converter, flow to the series voltage via DC capacitor and mend
The final injected system of device is repaid, vice versa.Meanwhile the shunt voltage converter and the series voltage compensator can be in its friendships
It flows output end and independently exchanges reactive power with system.The 10kV power distribution network turns electricity without suture ring in one of the embodiments,
Device includes series voltage compensator described in two groups, and the control strategy of the single-phase electricity potential source code converter should make two feeder lines
System voltage compensate in opposite directions, reduce the difference of the through-flow size between series voltage compensator described in two feeder lines.The list
The control strategy of phase voltage source code converter should be coordinated to adjust two series voltage compensators simultaneously, guarantee compensated system
Always three-phase symmetrical according to the real-time system method of operation issues each single-phase electricity potential source code converter to system voltage after comprehensive regulation
Instruction references compensation voltage signal.The 10kV power distribution network is arranged without suture according to design requirement in one of the embodiments,
Ring turns the line voltage compensation degree of electric installation, the no-load voltage ratio of the shunt voltage converter, the no-load voltage ratio of the series voltage compensator with
And DC voltage.Line voltage compensation degree is 5% in one of the embodiments, and the shunt voltage converter no-load voltage ratio is selected as
10kV/250V, the series voltage compensator no-load voltage ratio are selected as 250V/250V, and DC voltage is regulated to 500V.In this way, it is ensured that
Power distribution network, which does not have a power failure, turns electricity, and cyclization process does not generate circulation；Also, electric installation is turned without suture ring using the application 10kV power distribution network
Afterwards, the electrically operated step of closed loop network turn is constant, convenient for operation.
In one embodiment, a kind of 10kV power distribution network turns electric installation without suture ring comprising shunt voltage converter and
Two groups of series voltage compensators, the DC side phase of the DC side of the series voltage compensator and the shunt voltage converter
Even；Series voltage compensator described in every group, which is used to connect, to be accessed one group of feeder line and compensates the system voltage of two groups of feeder lines in opposite directions；
The 10kV power distribution network without suture ring turns Denso and is set to every group of feeder line to set there are three input terminal and three in one of the embodiments,
A output end.In this way, every group of feeder line is respectively connected to from three input terminals and picks out respectively from three output ends.A reality wherein
It applies in example, it includes series voltage compensator and shunt voltage converter that the 10kV power distribution network, which turns electric installation without suture ring, described
The DC side of series voltage compensator is connected with the DC side of the shunt voltage converter；In the series voltage compensator
Each phase includes series coupled transformer and single-phase electricity potential source code converter；The shunt voltage converter includes parallel pressure change
Device and three-phase voltage source code converter；Also, it includes series electrical described in two groups that the 10kV power distribution network, which turns electric installation without suture ring,
Compensator is pressed, series voltage compensator described in every group is for one group of feeder line of access of connecting；The single-phase electricity potential source code converter tool
There are n the first parallel-connection structures parallel with one another；The three-phase voltage source code converter is equipped with m parallel with one another second and is coupled
Structure.
The series voltage compensator generates expected offset voltage and couples with system voltage in one of the embodiments,
Realize the Phaseshift controlling of line voltage distribution.In one embodiment, the series voltage compensator is described for realizing phase splitting compensation
Each phase in series voltage compensator includes series coupled transformer and single-phase electricity potential source code converter；A reality wherein
It applies in example, the series voltage compensator uses the principle of phase splitting compensation, and each phase is by series coupled transformer and single-phase voltage
Source code converter composition.The single-phase electricity potential source code converter is equipped with multiple parallel with one another the in one of the embodiments,
One parallel-connection structure.Further, the series voltage compensator is electric for realizing no suture ring turn in one of the embodiments,
Device eliminates the major function of circulation, injects an amplitude to distribution network system by series coupled transformer and phase is adjustable
The amplitude of the synchronization series voltage of section, the voltage is horizontal related to system voltage, and the phase of the voltage can change in four-quadrant.It should
Injecting voltage may be regarded as synchronous AC voltage source, to the voltage of two feeder lines by amplitude and phase is mutually compensated, keep three-phase voltage
Under the conditions of symmetrical, so that each phase voltage amplitude is identical with phase on two feeder lines.When feeder current flows through series voltage compensation
When device, the two interaction generates the exchange of active power and reactive power.
The single-phase electricity potential source code converter is equipped with multiple parallel with one another first and is coupled in one of the embodiments,
Structure and the single-phase electricity potential source code converter are used to inhibit the circulation between converters at different levels.Wherein, it is the multiple include 2 or with
On.The multiple first parallel-connection structure parallel with one another is n parallel with one another first and is coupled in one of the embodiments,
Structure.In one of the embodiments, the single-phase electricity potential source code converter for coordinate two series voltage compensators with
Compensated system voltage is set to keep three-phase symmetrical.The single-phase electricity potential source code converter is also used in one of the embodiments,
In the instruction references offset voltage letter for according to the real-time system method of operation, issuing each single-phase electricity potential source code converter after comprehensive regulation
Number.The control strategy of the single-phase electricity potential source code converter is for being run according to real-time system in one of the embodiments,
Mode issues the instruction references compensation voltage signal of each single-phase electricity potential source code converter after comprehensive regulation.An implementation wherein
In example, n is 2 to 100；The series in parallel of i.e. described first parallel-connection structure is 2 grades to 100 grades, remaining embodiment and so on.?
In one embodiment, 2 n, i.e., the described single-phase electricity potential source code converter have 2 the first parallel-connection structures parallel with one another.
N is 5 in one of the embodiments, i.e., the described single-phase electricity potential source code converter has 5 parallel with one another first and is coupled
Structure, remaining embodiment and so on.
First parallel-connection structure includes first capacitor, the second capacitor, four insulated gates pair in one of the embodiments,
Bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), the first inductance and the second inductance；Wherein, four
A IGBT forms doube bridge arm and in parallel with first capacitor and be used to be in parallel with other first parallel-connection structures, four insulated gate bipolars
Transistor npn npn includes the first insulated gate bipolar transistor to the 4th insulated gate bipolar transistor, and the first end of the first inductance connects
It is connected between the first insulated gate bipolar transistor and third insulated gate bipolar transistor, the first end of the second inductance is connected to
Between second insulated gate bipolar transistor and the 4th insulated gate bipolar transistor, the second end of the first inductance passes through the second electricity
Hold the second end of the second inductance of connection, the second end of the first inductance is also used to connect the first inductance of other first parallel-connection structures
Second end, the second end of the second inductance are also used to connect the second end of the second inductance of other first parallel-connection structures.It is such to set
Meter, can be improved through-current capability, and cooperation control inhibits the circulation between converters at different levels, reduces harmonic wave of output voltage content.At it
In middle one embodiment, as shown in figure 3, the single-phase electricity potential source code converter is equipped with multiple parallel with one another first and is coupled
Structure, every one first parallel-connection structure include first capacitor, the second capacitor, the first inductance, the second inductance and four IGBT；Four IGBT
Formation doube bridge arm is simultaneously in parallel with first capacitor, and is in parallel with other first parallel-connection structures；The first end of first inductance connects
Between two IGBT of a bridge arm, the second end of the first inductance connects the second of the first inductance of other first parallel-connection structures
End, the second end of the first inductance also pass through the second end of second the second inductance of capacitance connection；The first end of second inductance is connected to
Between two IGBT of another bridge arm, the second end of the second inductance is also connected with the second of the second inductance of other first parallel-connection structures
End.
Further, the shunt voltage converter is used for through shunt transformer to matching in one of the embodiments,
Network system injection or absorbing reactive power maintain dot system alternating voltage in parallel；By shunt transformer to distribution network system
Injection absorbs active power, meets the series voltage compensator the needs of Coupling point is with systems exchange active power.?
In one embodiment, the shunt voltage converter includes shunt transformer and three-phase voltage source code converter；One wherein
In embodiment, the shunt voltage converter is made of shunt transformer and three-phase voltage source code converter.A reality wherein
It applies in example, the shunt voltage converter is separately connected two breakers, and the shunt voltage converter passes through each open circuit
Device connects the series voltage compensator and for connecting one group of feeder line.The electricity in parallel in one of the embodiments,
Buckling parallel operation is respectively connected to two feeder lines by breaker, and side breaker closes the disconnection of the other side breaker when operation, from turning
Enter feeder line and takes electricity.The shunt transformer uses Y/ delta connection in one of the embodiments,.In one of the embodiments,
According to design capacity, the shunt transformer is set.
The three-phase voltage source code converter is equipped with multiple parallel with one another second and is coupled in one of the embodiments,
Structure.In one of the embodiments, the three-phase voltage source code converter be equipped with multiple second parallel-connection structures parallel with one another and
The three-phase voltage source code converter for reducing input current harmonic content.Wherein, the multiple includes 2 or more.
The multiple second parallel-connection structure parallel with one another is m the second parallel-connection structures parallel with one another in one of the embodiments,.
M is 2 to 100 in one of the embodiments,；The series in parallel of i.e. described second parallel-connection structure is 2 grades to 100 grades, remaining reality
Apply example and so on.M is 3 in one of the embodiments, i.e., the described single-phase electricity potential source code converter is parallel with one another with 3
The second parallel-connection structure.In one of the embodiments, m be 6, i.e., the described single-phase electricity potential source code converter have 6 mutually simultaneously
Second parallel-connection structure of connection.
Second parallel-connection structure has three bridge arm structure of three-phase in one of the embodiments,.An implementation wherein
In example, second parallel-connection structure includes three inductance, third capacitor and six insulated gate bipolar transistors, wherein six
Insulated gate bipolar transistor formed three bridge arms and it is in parallel with third capacitor and be used for be in parallel with other second parallel-connection structures, often
There are two insulated gate bipolar transistor and connecting a phase alternating current circuit therebetween on one bridge arm, and each bridge arm passes through an electricity respectively
Sense connects different phase alternating current circuit, that is, different phases alternating current circuit, that is, each bridge arm passes through one phase alternating current circuit of an inductance connection.
Such design, can be improved through-current capability, and cooperation control can reduce the harmonic content of input current.One embodiment wherein
In, shunt voltage converter as shown in Fig. 2, shunt voltage converter includes shunt transformer and three-phase voltage source code converter,
Three-phase voltage source code converter is equipped with multiple second parallel-connection structures parallel with one another, and every one second parallel-connection structure has three bridge of three-phase
Arm configuration, second parallel-connection structure include third capacitor and six insulated gate bipolar transistors, wherein six insulated gates are double
Bipolar transistor formed three bridge arms and it is in parallel with third capacitor and be used for be in parallel with other second parallel-connection structures, on each bridge arm
A phase alternating current circuit is connected there are two insulated gate bipolar transistor and therebetween, and each bridge arm is separately connected different phase alternating current
Road.
First parallel-connection structure and second parallel-connection structure are in parallel setting in one of the embodiments,.That is,
In one embodiment, the first parallel-connection structure described in each embodiment and second parallel-connection structure are in parallel setting, remaining reality
Example and so on is applied, is repeated no more.Further, the shunt voltage converter and the string in one of the embodiments,
Connection voltage compensator is respectively used to independently exchange reactive power with distribution network system in ac output end.Such design, can be with
The circulation that power distribution network especially 10kV closed loop network turns electric process generation is eliminated, avoids causing equipment because closed loop power flow is excessive
Overload, false protection etc. reduce management and running personnel and make micro-judgment bring electricity to inconsiderable, immesurable closed loop network
Net security risk improves the success rate that cyclization turns electricity, further strengthens the reliability of area power grid power supply.
The 10kV power distribution network turns electric installation setting in power distribution room without suture ring in one of the embodiments, this is matched
Should be comprising 2 or more different feeder lines in electric room, and two feeder lines for having interconnection switch is selected to access herein described 10kV
Power distribution network turns electric installation without suture ring.
Herein described 10kV power distribution network without suture ring turns electric installation and shares 12 access points to be communicated with the outside, for feeder line
1, by AF1、BF1、CF1It introduces, through A'F1、B'F1、C'F1It draws；For feeder line 2, by AF2、BF2、CF2It introduces, through A'F2、B'F2、C'F2
It draws.It includes that 1 group of shunt voltage converter and 2 groups of series voltages are mended that herein described 10kV power distribution network, which turns electric installation without suture ring,
Device is repaid, the shunt voltage compensator is connected by BK1 with feeder line 1, and the shunt voltage compensator passes through BK2 and feeder line 2
It is connected, the series voltage compensator is connected with the DC side of the shunt voltage converter.
The shunt voltage converter includes shunt transformer TshWith three-phase voltage source code converter, shunt transformer Tsh
Using Y/ delta connection.The system voltage --- specific access feeder line by cyclization turn electricity be transferred to feeder line determine --- of feeder line 1 or feeder line 2
Through TshU is obtained after decompressionsh, input voltage as the three-phase voltage source code converter.Regulate and control the three-phase voltage source type to become
Parallel operation, so that DC voltage UdcAmplitude stability, and to the active power quick response that the series voltage compensator requires.Institute
Stating shunt voltage converter is the indispensable important component of each embodiment of the application, is to constitute active power to circulate
An essential ring.
Turn the capacity requirement of electric installation under reply different condition without suture ring to herein described 10kV power distribution network, it is described simultaneously
Join the shunt transformer T in voltage changershIt can accordingly be chosen according to design capacity, and three-phase voltage source code converter can be with
Through-current capability is improved using the structure of plural parallel stage, as shown in Figure 2.When the series in parallel of the three-phase voltage source code converter is
When 2 or more, should have the function of circulation inhibiting converters at different levels between its regulating strategy, while be further reduced input electricity
The harmonic components of stream.
The series voltage compensator includes series coupled transformer TseWith single-phase electricity potential source code converter, single-phase electricity potential source
Code converter is designed using common DC bus, the DC side interconnection of all single-phase electricity potential source code converters on two feeder lines, and
It is connected with the DC side of the shunt voltage converter.DC voltage UdcIt converts and is mended through each single-phase electricity potential source code converter
Voltage is repaid, T is passed throughseBy UseIt is coupled in each phase system voltage of feeder line.To the corresponding single-phase electricity potential source code converter of two feeder lines
Regulation, so that compensated each feeder system voltage UrAmplitude and phase it is all the same.The single-phase electricity potential source code converter
Control strategy should make the system voltage of two feeder lines compensate in opposite directions, reduce between series voltage compensator described in two feeder lines
The difference of through-flow size.The control strategy of the single-phase electricity potential source code converter should be coordinated to adjust two series voltages simultaneously
Compensator guarantees compensated system voltage three-phase symmetrical always, according to the real-time system method of operation, issues after comprehensive regulation each
The instruction references compensation voltage signal of single-phase electricity potential source code converter.
The structure of single-phase electricity potential source code converter is as shown in figure 3, using plural parallel stage knot in the series voltage compensator
Structure improves through-current capability.When the series in parallel of the single-phase electricity potential source code converter is 2 or more, to its regulating strategy
Should have the function of circulation between inhibiting converters at different levels, while be further reduced the harmonic components of output voltage.The present embodiment
Line voltage compensation degree is 5%, the T of the shunt voltage convertershNo-load voltage ratio is selected as 10kV/250V, the series voltage compensator
TseNo-load voltage ratio is selected as 250V/250V, DC voltage UdcIt is regulated to 500V.
When feeder line 1 needs out of service, the breaker BK2 of the application closes, and breaker BK1 is disconnected, DC side charging,
The series voltage compensator injects coupled voltages U to systemse1And Use2, feeder line 1 is in A' under the regulation of control strategyF1、
B'F1、C'F1Export Ur1, feeder line 2 is in A'F2、B'F2、C'F2Export Ur2, Ur1And Ur2Amplitude is consistent with phase.Detect Ur1And Ur2
After amplitude is consistent with phase, 10kV ring network cabinet S0 switch, cyclization process aspergillus ficuum are closed.S1 switch is disconnected, feeder line 1 exits fortune
Row.When mode of resuming operation, process is similar.In this way, the circulation that 10kV closed loop network turns electric process generation can be eliminated, can protect
Card power distribution network, which does not have a power failure, turns electricity, and cyclization process does not generate circulation, avoids causing apparatus overload, protection to miss because closed loop power flow is excessive
It moves, reduces management and running personnel and micro-judgment bring power grid security risk is made to inconsiderable, immesurable closed loop network,
And closed loop network turns that electrically operated step is constant, improves the success rate that cyclization turns electricity, further reinforcement area power grid supplies
The reliability of electricity.
It should be noted that the other embodiments of the application further include, the mutually group of the technical characteristic in the various embodiments described above
Close be formed by, the 10kV power distribution network that can implement turns electric installation without suture ring.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to claim therefore cannot be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of patent protection of the application should be determined by the appended claims.
Claims (10)
1. a kind of 10kV power distribution network turns electric installation without suture ring, which is characterized in that including series voltage compensator and shunt voltage
Converter, the DC side of the series voltage compensator are connected with the DC side of the shunt voltage converter；
For the series voltage compensator for realizing phase splitting compensation, each phase in the series voltage compensator includes series connection
Coupling transformer and single-phase electricity potential source code converter；
The shunt voltage converter includes shunt transformer and three-phase voltage source code converter；
Also, it includes series voltage compensator described in two groups that the 10kV power distribution network, which turns electric installation without suture ring, is gone here and there described in every group
Connection voltage compensator, which is used to connect, to be accessed one group of feeder line and compensates the system voltage of two groups of feeder lines in opposite directions.
2. 10kV power distribution network turns electric installation without suture ring according to claim 1, which is characterized in that the single-phase electricity potential source type
Converter is equipped with multiple first parallel-connection structures parallel with one another and the single-phase electricity potential source code converter is for inhibiting transformation at different levels
Circulation between device.
3. 10kV power distribution network turns electric installation without suture ring according to claim 2, which is characterized in that the single-phase electricity potential source type
Converter is for coordinating two series voltage compensators so that compensated system voltage keeps three-phase symmetrical.
4. 10kV power distribution network turns electric installation without suture ring according to claim 3, which is characterized in that the single-phase electricity potential source type
Converter is also used to according to the real-time system method of operation, and the instruction references of each single-phase electricity potential source code converter are issued after comprehensive regulation
Compensation voltage signal.
5. 10kV power distribution network turns electric installation without suture ring according to claim 1, which is characterized in that the three-phase voltage source type
Converter is equipped with multiple second parallel-connection structures parallel with one another and the three-phase voltage source code converter for reducing input current
Harmonic content.
6. 10kV power distribution network turns electric installation without suture ring according to claim 1, which is characterized in that the shunt voltage transformation
Device is separately connected two breakers, and the shunt voltage converter connects the series voltage compensator by each breaker
And for connecting one group of feeder line.
7. 10kV power distribution network turns electric installation without suture ring according to claim 1, which is characterized in that the shunt transformer is adopted
With Y/ delta connection.
8. 10kV power distribution network turns electric installation without suture ring according to claim 1, which is characterized in that be arranged according to design capacity
The shunt transformer.
9. turning electric installation without suture ring to 10kV power distribution network described in any one of 8 according to claim 1, which is characterized in that described
Power distribution network is 10kV power distribution network.
10. 10kV power distribution network turns electric installation without suture ring according to claim 9, which is characterized in that set according to design requirement
The line voltage compensation degree that the 10kV power distribution network turns electric installation without suture ring is set, the no-load voltage ratio of the shunt voltage converter is described
The no-load voltage ratio and DC voltage of series voltage compensator.
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| CN113078635A (en) * | 2021-04-07 | 2021-07-06 | 广东电网有限责任公司广州供电局 | Multi-port back-to-back type seamless ring power conversion device and method |
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