CN108832642A - A kind of regulator control system and judgment method for transmission line of electricity three-phase imbalance - Google Patents
A kind of regulator control system and judgment method for transmission line of electricity three-phase imbalance Download PDFInfo
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- CN108832642A CN108832642A CN201810713301.7A CN201810713301A CN108832642A CN 108832642 A CN108832642 A CN 108832642A CN 201810713301 A CN201810713301 A CN 201810713301A CN 108832642 A CN108832642 A CN 108832642A
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- transmission line
- electricity
- phase imbalance
- bridge arm
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
-
- 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
-
- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a kind of regulator control systems for transmission line of electricity three-phase imbalance, belong to electric power quality technical field.The present invention proposes a kind of regulation method and a kind of based on Modular multilevel converter aiming at the problem that transmission line of electricity three-phase imbalance（MMC）Reactive power compensator constitute transmission line of electricity three-phase imbalance regulator control system.The system can effectively administer transmission line of electricity three-phase imbalance problem.Execution unit of the invention using a kind of novel reactive power compensator based on the asymmetric MMC of upper and lower bridge arm submodule, can overcome the deficiencies in the prior art, there is apparent application advantage in the power transmission network of high-power, such as adjust accurately and rapidly；Output level quantity is more, and harmonic content is few；Has DC side failure self-cleaning ability etc..The system has the characteristics that economic and reliable, realization is simple, has excellent performance, and can be applied in overhead transmission line and cable transmission line Practical Project.
Description
Technical field
The present invention relates to electric power quality technical fields, are used for transmission line of electricity three-phase more particularly, to one kind
Unbalanced regulator control system and judgment method.
Background technique
Three-phase imbalance is one of the important indicator for measuring power quality, and the three-phase imbalance of electric system refers to three-phase electricity
Pressure/current amplitude is not of uniform size and its difference has been more than defined range.Three-phase imbalance will affect the normal of power equipment
Operation, can threaten the safe operation of electric system when serious.There is three-phase imbalance in power distribution network and power transmission network, but be directed to
The three-phase imbalance of power distribution network is studied far more than to the unbalanced research of electricity transmission three-phase.Electricity transmission three-phase imbalance is to electric power
The harm of system bring is bigger, and bigger loss can be brought to system.With Chinese provinces and cities multi-circuit lines on the same tower and short distance
The local looped network of transmission line of electricity composition increases, the large-scale application of communication and power electronic equipment, and electricity transmission three-phase is uneven
Problem is more prominent, and it is more and more diversified to cause the unbalanced reason of its three-phase.
Currently, the research for transmission line of electricity three-phase imbalance problem and its administering method is not yet mature.Existing research
Overhead transmission line is focused primarily upon, most scholar pays close attention to multi-circuit lines on the same tower induced voltage, induced current and earthing switch
Coupling and when phase sequence unreasonable structure and arrangement caused three-phase current be not between selection issue, lightning protection properties and multiple-circuit on same tower
The problem of balance etc..Its solution mainly improves tri-phase unbalance factor by commutation sequence technology or Reactive-power control technology.
It is less to the research of Voltage Cable Lines Construction three-phase current unbalance problem, the arrangement mode of cable is focused primarily upon to degree of unbalancedness
Influence on.Therefore, to transmission line of electricity three-phase imbalance problem propose effective solution scheme have positive meaning and
Important practical value.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of tune for transmission line of electricity three-phase imbalance
Control system and judgment method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that：One kind being used for transmission line of electricity three-phase imbalance
Regulator control system and method, including be sequentially electrically connected signal acquisition unit, tri-phase unbalance factor computing unit, judging unit with
And execution unit；The signal acquisition unit acquires each phase voltage of load-side and electric current；The tri-phase unbalance factor computing unit
According to the electric signal parameter of signal acquisition unit acquisition and calculate the three-phase imbalance angle value of corresponding transmission line of electricity；The judgement is single
Member is for judging whether three-phase imbalance angle value is greater than preset tri-phase unbalance factor threshold value；The execution unit is used for
It is acted under the triggering of judging unit.
In the technical scheme, transmission line of electricity voltage, current data signal are acquired by signal acquisition unit, and acquisition
Data-signal be transferred to tri-phase unbalance factor computing unit, tri-phase unbalance factor computing unit data-signal meter based on the received
Three-phase imbalance angle value is calculated, judging unit judges whether three-phase imbalance angle value is greater than preset three-phase imbalance threshold value,
Execution unit triggers lower movement according to judging unit, to realize the three-phase equilibrium on transmission line of electricity.
Preferably, the execution unit is the asymmetric MMC reactive power compensator of upper and lower bridge arm submodule, the upper and lower bridge arm
The asymmetric MMC reactive power compensator of submodule includes the asymmetric MMC controller of upper and lower bridge arm submodule and upper and lower bridge arm submodule
The asymmetric MMC inverter of block；The asymmetric MMC controller of upper and lower bridge arm submodule is according to transmission line of electricity voltage, current signal
And judging unit signal compensation controls reactive power.The asymmetric MMC controller of upper and lower bridge arm submodule can be according to power transmission line
Road voltage, current signal and judging unit signal compensation control reactive power, so as to improve transmission line of electricity tri-phase unbalance factor.
Preferably, the asymmetric MMC inverter of the upper and lower bridge arm submodule includes accessing load side by transformers connected in parallel
The MMC inverter of transmission line of electricity, the MMC inverter include six groups of bridge arms.
Preferably, the bridge arm includes concatenated reactor and several submodules.
Preferably, the submodule in the upper bridge arm of the bridge arm is half-bridge submodule, the son in the lower bridge arm of the bridge arm
Module is full-bridge submodule.Setting can enable MMC inverter to have and lead in dc-link capacitance short trouble in this way
The ability for crossing faults itself self-cleaning, when DC side breaks down, can be by control the sum of upper and lower bridge arm voltage zero come
Extinguish DC Line Fault fault current.
The present invention also provides a kind of judgment methods of regulator control system for transmission line of electricity three-phase imbalance：
S1：Receive the degree of unbalancedness calculated value of tri-phase unbalance factor computing unit；
S2：Determine whether calculated value is greater than preset threshold, if it has not, step S1 is then gone to, if it has, then going to step
S3；:
S3：Judgement three-phase imbalance is fault or non-faulting, if fault, then step S1 is gone to, if non-
It is fault, then go to step S4；
S4：Triggering execution unit compensates control control.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention utilize signal acquisition unit, tri-phase unbalance factor computing unit, judging unit to transmission line of electricity three-phase not
The case where balance is judged in advance, can determine transmission line of electricity three-phase imbalance rapidly, thus more economical reliable triggering
Compensate execution unit movement.The system has the characteristics that economic and reliable, realization is simple, has excellent performance, and can be applied to overhead transmission line
And in cable transmission line Practical Project；The present invention, which utilizes, is based on the asymmetric MMC reactive power compensator of upper and lower bridge arm submodule,
Can overcome the deficiencies in the prior art, there is apparent application advantage in the power transmission network of high-power, such as adjust accurate fast
Speed；Output level quantity is more, and harmonic content is few；Have DC side failure and understands ability etc. certainly.
Detailed description of the invention
Fig. 1 is a kind of module map of the regulator control system for transmission line of electricity three-phase imbalance of the present invention；
Fig. 2 is the judgment method flow chart of judging unit in the present invention；
Fig. 3 accesses structure when transmission system for the asymmetric MMC reactive power compensator of upper and lower bridge arm submodule in the present invention
Schematic diagram；
Fig. 4 is the asymmetric MMC reactive power compensator topology diagram of upper and lower bridge arm submodule.
Specific embodiment
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" is based on attached drawing
Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion is signified
Device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore positional relationship is described in attached drawing
Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment
As shown in Figure 1, a kind of regulator control system of user's transmission line of electricity three-phase imbalance, the signal including being sequentially electrically connected are adopted
Collect unit 1, tri-phase unbalance factor computing unit 2, judging unit 3 and execution unit 4；The acquisition of signal acquisition unit 1 is negative
Carry each phase voltage in side and electric current；The electric signal parameter and meter that tri-phase unbalance factor computing unit 2 is acquired according to signal acquisition unit 1
Calculate the three-phase imbalance angle value of corresponding transmission line of electricity；Judging unit 3 is set in advance for judging whether three-phase imbalance angle value is greater than
Fixed tri-phase unbalance factor threshold value；Execution unit 4 under the triggering of judging unit 3 for acting.
In three-phase imbalance computing unit 2 according to the collected electric signal parameter of acquisition unit 1, corresponding transmission line of electricity is calculated
Three-phase imbalance angle value, by taking electric current as an example, the calculation of degree of unbalancedness is as follows：
Wherein, Ia, Ib, IcRespectively transmission line of electricity A, B, C three-phase phase current virtual value, IavgFor A, B, C three-phase phase current
Average value.
Wherein, judging unit 3 judges whether tri-phase unbalance factor calculated value is greater than preset tri-phase unbalance factor threshold
Value, if calculated value is greater than set threshold value, judging unit 3 also need to judge current three-phase imbalance be it is fault it is uneven (such as
Single-line to ground fault) or non-faulting imbalance, determine if the uneven duration is less than preset time threshold
For fault imbalance, the movement of execution unit 4 is not triggered；Otherwise, execution unit 4 acts under the triggering of judging unit 3, specifically
The decision flow chart of judging unit 3 is as shown in Figure 2.
As shown in Fig. 2, be the decision flow chart of judging unit, it is specific as follows：
S1：Receive the degree of unbalancedness calculated value of tri-phase unbalance factor computing unit；
S2：Determine whether calculated value is greater than preset threshold, if it has not, step S1 is then gone to, if it has, then going to step
S3；
S3：Judgement three-phase imbalance is fault or non-faulting, if fault, then step S1 is gone to, if non-
It is fault, then go to step S4；
S4：Triggering execution unit compensates control control.
Wherein, execution unit 4 is the asymmetric MMC reactive power compensator of upper and lower bridge arm submodule, and upper and lower bridge arm submodule is non-
Symmetrical MMC reactive power compensator includes the asymmetric MMC controller of upper and lower bridge arm submodule；The asymmetric MMC of upper and lower bridge arm submodule
Inverter.The asymmetric MMC reactive power compensator access transmission line of electricity schematic diagram of upper and lower bridge arm submodule is as shown in Figure 3, wherein Us
For sending end voltage, isFor sending end electric current, ULFor load side voltage, iLFor load side electric current, iMMCIt is non-right for upper and lower bridge arm submodule
MMC reactive power compensator is claimed to compensate electric current.
The asymmetric MMC controller of upper and lower bridge arm submodule is believed according to transmission line of electricity voltage, current signal and judging unit
Number compensation control reactive power (injection/absorption), so as to improve transmission line of electricity tri-phase unbalance factor.
In addition, the asymmetric MMC inverter of upper and lower bridge arm submodule includes a MMC inverter, exchange side passes through transformation
Device parallel connection accesses load side transmission line of electricity, in detail topology as shown in Figure 4, wherein Sn(n=1~4) are that switching device is (usual
For IGBT), Dn(n=1~4) are switching device anti-paralleled diode, CSMFor submodule capacitance, UcFor submodule voltage, USM
For submodule output voltage, (HBSM output valve is 0 or Uc, FBSM output valve is 0, UcOr-Uc), L0For bridge arm reactor inductance
Value, UdcFor MMC compensation device DC voltage value.
Wherein, the asymmetric MMC inverter of upper and lower bridge arm submodule includes six bridge arms, and each bridge arm is by reactor and N number of
Submodule is sequentially connected in series.The submodule of all upper bridge arms of the asymmetric MMC inverter of upper and lower bridge arm submodule is half-bridge
Module, lower bridge arm submodule is full-bridge submodule, so that have can in dc-link capacitance short trouble for inverter
By itself control by the ability of failure self-cleaning, when DC side breaks down, can by control upper and lower bridge arm voltage it
Extinguish DC Line Fault fault current with for zero.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (7)
1. a kind of regulator control system and method for transmission line of electricity three-phase imbalance, it is characterised in that：Including what is be sequentially electrically connected
Signal acquisition unit（1）, tri-phase unbalance factor computing unit（2）, judging unit（3）And execution unit（4）；The signal is adopted
Collect unit（1）Acquire each phase voltage of load-side and electric current；The tri-phase unbalance factor computing unit（2）According to signal acquisition unit
（1）The electric signal parameter of acquisition and the three-phase imbalance angle value for calculating corresponding transmission line of electricity；The judging unit（3）For judging
Whether three-phase imbalance angle value is greater than preset tri-phase unbalance factor threshold value；The execution unit（4）For single in judgement
Member（3）Triggering under act.
2. a kind of regulator control system and method for transmission line of electricity three-phase imbalance according to claim 1, feature exist
In：The execution unit（4）For the asymmetric MMC reactive power compensator of upper and lower bridge arm submodule.
3. a kind of regulator control system and method for transmission line of electricity three-phase imbalance according to claim 2, feature exist
In：The asymmetric MMC reactive power compensator of upper and lower bridge arm submodule include the asymmetric MMC controller of upper and lower bridge arm submodule with
And the asymmetric MMC inverter of upper and lower bridge arm submodule；The asymmetric MMC controller of upper and lower bridge arm submodule is according to transmission line of electricity
Voltage, current signal and judging unit signal compensation control reactive power.
4. a kind of regulator control system and method for transmission line of electricity three-phase imbalance according to claim 3, feature exist
In：The asymmetric MMC inverter of upper and lower bridge arm submodule includes the MMC that load side transmission line of electricity is accessed by transformers connected in parallel
Inverter, the MMC inverter include six groups of bridge arms.
5. a kind of regulator control system and method for transmission line of electricity three-phase imbalance according to claim 4, feature exist
In：The bridge arm includes concatenated reactor and several submodules.
6. a kind of regulator control system and method for transmission line of electricity three-phase imbalance according to claim 5, feature exist
In：Submodule in the upper bridge arm of the bridge arm is half-bridge submodule, and the submodule in the lower bridge arm of the bridge arm is full-bridge
Module.
7. a kind of regulator control system and method for transmission line of electricity three-phase imbalance according to any one of claims 1 to 6,
It is characterized by comprising the following steps：
S1：Receive the degree of unbalancedness calculated value of tri-phase unbalance factor computing unit；
S2：Determine whether calculated value is greater than preset threshold, if it has not, step S1 is then gone to, if it has, then going to step S3；
S3：Judgement three-phase imbalance is fault or non-faulting, if fault, then step S1 is gone to, if non-faulting
Property, then go to step S4；
S4：Triggering execution unit compensates control.
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| CN201810713301.7A CN108832642A (en) | 2018-06-29 | 2018-06-29 | A kind of regulator control system and judgment method for transmission line of electricity three-phase imbalance |
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| CN111525585A (en) * | 2020-07-06 | 2020-08-11 | 深圳华工能源技术有限公司 | Voltage-stabilizing energy-saving and three-phase imbalance treatment energy-saving coordination control method |
| WO2024060062A1 (en) * | 2022-09-21 | 2024-03-28 | 宁德时代未来能源(上海)研究院有限公司 | Power equalization method and apparatus for electric power system, and computer device and storage medium |
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