CN110086182A - 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method - Google Patents
10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method Download PDFInfo
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- CN110086182A CN110086182A CN201910404680.6A CN201910404680A CN110086182A CN 110086182 A CN110086182 A CN 110086182A CN 201910404680 A CN201910404680 A CN 201910404680A CN 110086182 A CN110086182 A CN 110086182A
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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
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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
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The present invention provides a kind of 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method, by calculating three-phase current unbalance degree, first has to carry out sequence decomposition to the three-phase current of power grid, calculates positive sequence, negative phase-sequence and the zero-sequence current in power grid；Three-phase equilibrium and distribution loss index in order to realize distribute-electricity transformer district low-pressure side is optimal, needs negative-sequence current to be intended to zero as far as possible, solves the optimal reactive compensation capacity of three phase capacitance；The method achieve under the mode of purely capacitive compensation, the three-phase equilibrium of distribute-electricity transformer district low-pressure side and distribution loss index optimize operation.The optimal control policy that this method is calculated based on the real-time running state of distribution low-voltage side, continuous switched capacitor group is needed not rely on slowly to obtain optimal index, on the basis of not promoting existing low pressure parallel condenser compensation device cost, three-phase equilibrium and distribution loss index, the economic and social benefit for being greatly improved distribute-electricity transformer district low-pressure side are huge.
Description
Technical field
The present invention relates to a kind of 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation methods.
Background technique
Currently, the low-voltage compensation of distribute-electricity transformer district is broadly divided into two major classes, the first kind is to measure critical point with distribution low-voltage side
Exit potential qualification be index capacitance compensation, the problem of this kind of compensation way maximum is that switching strategy is too simple, completely according to
Switching is carried out according to distribution low-voltage side metering critical point voltage condition, especially three-phase imbalance situation is more obvious when distribution low-voltage side
When, it may occur that putting into a certain phase capacitor causes the voltage of other phases to plummet, so that capacitor be caused constantly to repeat switching
Until the case where being latched, can not effectively realize the compensation of distribute-electricity transformer district low-pressure side, and greatly reduce Electric capacity compensation device
Service life.
Second class be using distribution low-voltage side metering critical point three-phase equilibrium as the silent oscillation reacance generator (SVG) of index,
Such device has carried out overcompensation, device for the exit potential qualification and three-phase complete equipilibrium of realizing distribute-electricity transformer district low-pressure side
Cost is excessively high, is not suitable for the very huge low-voltage network of current scale；And such device is in order to pursue the ultimate attainment of index
Property, it must be installed in distribution low-voltage outlet side, it is very little to practical improvement effect of low-voltage electricity user.
The above problem should be paid attention to and be solved the problems, such as during the low-voltage compensation of distribute-electricity transformer district.
Summary of the invention
The object of the present invention is to provide a kind of 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation methods
Solve how to realize under the mode of purely capacitive compensation in the prior art, the three-phase equilibrium of distribute-electricity transformer district low-pressure side and distribution loss
Index optimizes the problem of operation.
The technical solution of the invention is as follows:
A kind of 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method, comprising the following steps:
S1, three-phase current unbalance degree is calculated, first has to carry out sequence decomposition to the three-phase current of power grid, calculates in power grid
Positive sequence, negative phase-sequence and zero-sequence current；
S2, the three-phase equilibrium in order to realize distribute-electricity transformer district low-pressure side and distribution loss index are optimal, need negative-sequence current most
It is possible to be intended to zero, solve the optimal reactive compensation capacity of three phase capacitance.
Further, in step S1, positive sequence, negative phase-sequence and the zero-sequence current in power grid are calculated:
In formula,For A phase forward-order current,For A phase negative-sequence current,For zero-sequence current, α is counterclockwise in polar coordinates
120 ° of rotation,For A phase current,For B phase current,For C phase current.
Further, in step S2, three-phase equilibrium and the distribution loss index in order to realize distribute-electricity transformer district low-pressure side are optimal,
It needs negative-sequence current to be intended to zero as far as possible, solves the optimal reactive compensation capacity of three phase capacitance；Specifically, in purely capacitive benefit
Under the mode repaid, sequence decomposition is carried out to the three phase capacitance of compensation, every phase compensates electric current are as follows:
In formula,Electric current positive-sequence component is compensated for A phase,Electric current positive-sequence component is compensated for B phase,To compensate electric current
Zero-sequence component, α are to rotate 120 ° counterclockwise in polar coordinates,Electric current is compensated for A phase,Electric current is compensated for B phase,It is mended for C phase
Repay electric current, QaFor A phase compensation capacity, QbFor B phase compensation capacity, QcFor C phase compensation capacity, UaFor A phase voltage, UbFor B phase voltage,
UcFor C phase voltage；For polar coordinates expression formula, the expression formula for being converted into rectangular co-ordinate is
Similarly；
Electric current after three-phase compensation after synthesis are as follows:
The equation is solved:
It obtains:
In formula,
Objective functionThat is:
Solve the optimal reactive compensation capacity of three phase capacitance are as follows:
Qa, Qb, Qc are optimal reactive compensation capacity in formula.
The beneficial effects of the present invention are: this kind of 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation side
Method realizes under the mode of purely capacitive compensation, and the three-phase equilibrium of distribute-electricity transformer district low-pressure side and distribution loss index optimize fortune
Row.This kind of 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method, the real-time fortune based on distribution low-voltage side
The optimal control policy that row state computation obtains needs not rely on continuous switched capacitor group slowly to obtain optimal index, and
The compensation device of mode suitable for purely capacitive compensation, on the basis for not promoting existing low pressure parallel condenser compensation device cost
On, three-phase equilibrium and distribution loss index, the economic and social benefit for being greatly improved distribute-electricity transformer district low-pressure side are huge.
Specific embodiment
The following detailed description of the preferred embodiment of the present invention.
Embodiment
Current most of low-voltage network be after distribution transformer is depressured, with three-phase four-wire system to customer power supply,
It is the supply network of three-phase productive power with single-phase load mixing electricity consumption.Due to the uncontrollable increase-volume of single-phase user, high-power list
The access of phase load and the asynchronism of single-phase load electricity consumption etc., all cause the imbalance of threephase load.If low voltage electric network
It is run in the larger situation of three-phase load unbalance degree, it will cause adverse effect to low voltage electric network and electrical equipment.
Embodiment is related to a kind of distribute-electricity transformer district low-pressure side reactive power compensation technology, proposes a kind of mode in purely capacitive compensation
Under, realize three-phase equilibrium and the optimal reactive-load compensation method of distribution loss index of distribute-electricity transformer district low-pressure side.
S1, in electrical theory, to calculate three-phase current unbalance degree, first have to carry out sequence point to the three-phase current of power grid
Solution, calculates positive sequence, negative phase-sequence and the zero-sequence current in power grid:
In formula,For A phase forward-order current,For A phase negative-sequence current,For zero-sequence current, α is counterclockwise in polar coordinates
120 ° of rotation,For A phase current,For B phase current,For C phase current.
S2, the three-phase equilibrium in order to realize distribute-electricity transformer district low-pressure side and distribution loss index are optimal, need negative-sequence current i.e.
Ia- is intended to zero as far as possible；Specifically, carrying out sequence decomposition to the three phase capacitance of compensation, often under the mode of purely capacitive compensation
Mutually compensation electric current are as follows:
In formula,Electric current positive-sequence component is compensated for A phase,Electric current positive-sequence component is compensated for B phase,For compensation electricity
Zero-sequence component is flowed, α is to rotate 120 ° counterclockwise in polar coordinates,Electric current is compensated for A phase,Electric current is compensated for B phase,For C phase
Compensate electric current, QaFor A phase compensation capacity, QbFor B phase compensation capacity, QcFor C phase compensation capacity, UaFor A phase voltage, UbFor B phase electricity
Pressure, UcFor C phase voltage；For polar coordinates expression formula, the expression formula for being converted into rectangular co-ordinate is
Similarly；
Electric current after three-phase compensation after synthesis are as follows:
The equation is solved:
It obtains:
In formula,
Objective functionThat is:
Solve the optimal reactive compensation capacity of three phase capacitance are as follows:
Qa, Qb, Qc are optimal reactive compensation capacity in formula.
In practical engineering applications, since the combination of low-voltage compensation capacitor is limited and is the group of several fixed capacities
It closes, when controlling it switching, needs to calculate every phase in combination substitution formula [2] by every kind of switching capacity and mend
Electric current is repaid, in conjunction with the power network current being calculated in formula [1], formula [3] carries out calculating verifying, obtains optimization
Capacitor group switching mode.
This kind of 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method, the reality based on distribution low-voltage side
The optimal control policy that Shi Yunhang state computation obtains needs not rely on continuous switched capacitor group slowly to obtain optimal finger
Mark, and it is suitable for the compensation device of the mode of purely capacitive compensation, do not promoting existing low pressure parallel condenser compensation device cost
On the basis of, three-phase equilibrium and distribution loss index, the economic and social benefit for being greatly improved distribute-electricity transformer district low-pressure side are huge.
Claims (3)
1. a kind of 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method, which is characterized in that including following
Step:
S1, three-phase current unbalance degree is calculated, first has to carry out sequence decomposition to the three-phase current of power grid, calculates in power grid just
Sequence, negative phase-sequence and zero-sequence current；
S2, the three-phase equilibrium in order to realize distribute-electricity transformer district low-pressure side and distribution loss index are optimal, need negative-sequence current as far as possible
Be intended to zero, solve the optimal reactive compensation capacity of three phase capacitance.
2. 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method as described in claim 1, feature
It is, in step S1, calculates positive sequence, negative phase-sequence and the zero-sequence current in power grid:
In formula,For A phase forward-order current,For A phase negative-sequence current,For zero-sequence current, α is to rotate counterclockwise in polar coordinates
120 °,For A phase current,For B phase current,For C phase current.
3. 10kV distribution transformer low-pressure side three-phase imbalance optimal reactive compensation method as claimed in claim 2, feature
It is, in step S2, three-phase equilibrium and the distribution loss index in order to realize distribute-electricity transformer district low-pressure side are optimal, need negative-sequence current
It is intended to zero as far as possible, solves the optimal reactive compensation capacity of three phase capacitance；Specifically, under the mode of purely capacitive compensation,
Sequence decomposition is carried out to the three phase capacitance of compensation, every phase compensates electric current are as follows:
In formula,Electric current positive-sequence component is compensated for A phase,Electric current positive-sequence component is compensated for B phase,To compensate current zero sequence
Component, α are to rotate 120 ° counterclockwise in polar coordinates,Electric current is compensated for A phase,Electric current is compensated for B phase,Electricity is compensated for C phase
Stream, QaFor A phase compensation capacity, QbFor B phase compensation capacity, QcFor C phase compensation capacity, UaFor A phase voltage, UbFor B phase voltage, UcFor
C phase voltage；For polar coordinates expression formula, the expression formula for being converted into rectangular co-ordinate is
Similarly；
Electric current after three-phase compensation after synthesis are as follows:
The equation is solved:
It obtains:
In formula,
Objective functionThat is:
Solve the optimal reactive compensation capacity of three phase capacitance are as follows:
Q in formulaa、Qb、QcAs optimal reactive compensation capacity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030144A (en) * | 2020-01-03 | 2020-04-17 | 云南电网有限责任公司电力科学研究院 | Direct current charging control method and system considering three-phase unbalance management |
| CN111600318A (en) * | 2019-08-09 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Current detection method for realizing target three-phase unbalance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026142A (en) * | 2016-07-21 | 2016-10-12 | 广东电网有限责任公司惠州供电局 | Three-phase load unbalance compensation method and system |
| CN106532736A (en) * | 2016-12-27 | 2017-03-22 | 南京理工大学 | SVG negative sequence and zero sequence current compensation method based on improved instantaneous symmetrical component method |
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2019
- 2019-05-15 CN CN201910404680.6A patent/CN110086182B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026142A (en) * | 2016-07-21 | 2016-10-12 | 广东电网有限责任公司惠州供电局 | Three-phase load unbalance compensation method and system |
| CN106532736A (en) * | 2016-12-27 | 2017-03-22 | 南京理工大学 | SVG negative sequence and zero sequence current compensation method based on improved instantaneous symmetrical component method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600318A (en) * | 2019-08-09 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Current detection method for realizing target three-phase unbalance |
| CN111600318B (en) * | 2019-08-09 | 2023-03-31 | 青岛鼎信通讯股份有限公司 | Current detection method for realizing target three-phase unbalance |
| CN111030144A (en) * | 2020-01-03 | 2020-04-17 | 云南电网有限责任公司电力科学研究院 | Direct current charging control method and system considering three-phase unbalance management |
| CN111030144B (en) * | 2020-01-03 | 2023-06-23 | 云南电网有限责任公司电力科学研究院 | Direct-current charging control method and system for three-phase imbalance treatment |
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