CN105406493B - It is a kind of based on have carry commutation technology low-voltage three-phase load balance control method - Google Patents
It is a kind of based on have carry commutation technology low-voltage three-phase load balance control method Download PDFInfo
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Abstract
Disclosed by the invention is a kind of based on there is the three balancing the load control method distribution transformer low-pressure sides of low pressure for carrying reverse flow technique often to return back out line as model, acquisition often returns back out reversing switch on line and controls load and the position of the switch, detection in real time is carried out to three-phase load unbalance degree to calculate, if tri-phase unbalance factor exceeds set-point, the load for needing to adjust is calculated by mean iterative method, then multiple-objection optimization principle draws the reversing switch number of needs action and the phase sequence of reversing switch adjustment, realizes three-phrase burden balance.The algorithm has taken into full account the factors such as switch motion number, tri-phase unbalance factor, reach in three load unbalanced degree of guarantee in standard value range, realize that switch motion number is minimum, commutation cost is minimum, simultaneously, it realizes the requirement of load transfer user's uninterrupted power supply, that is, has load reverse flow technique.
Description
Technical field
The invention mainly relates to the controls of power distribution network low-voltage circuit three-phrase burden balance, are managed based on three-phrase burden balance algorithm
By realization load has load commutation, belongs to control technology field.
Background technology
In the city dweller and countryside low-voltage electric distribution network of three-phase four-wire system, user is mostly single-phase load or single three-phase load
It is mixed, due to the asymmetry of the unbalanced and system component parameter of load, the three alternate objective generally existings of out-of-balance current.Together
When customer charge unbalance condition irregularities and unpredictability, cause the injustice of low-voltage network threephase load chronicity
Weighing apparatus.GB/T 15543-2008《Power quality three-phase voltage allows degree of unbalancedness》Clearly stipulate that electrical network negative phase-sequence under normal circumstances
The tri-phase unbalance factor of voltage is not more than 2%, in short-term no more than 4%；Each user's negative sequence voltage caused by points of common connection
Degree of unbalancedness must not exceed 1.3%, in short-term no more than 2.6%.Three-phase imbalance will cause electric rotating machine to add fever and shake
Dynamic, stray transformer flux increases and hot-spot, grid line loss increase and a variety of protections and automatic device malfunction etc..According to system
Meter, the current whole nation have more than 85% low-voltage platform area there are different degrees of three-phase imbalance situation, to this power department except
As far as possible reasonably outside distribution load almost without effective solution, some can only be taken as in increasing using experience
The safeguard measures such as property line section are to reduce the security risk that the excessive imbalance of three-phase is brought.
Tradition three load unbalanced methods of adjustment are bases《Distribution transformer platform area circuit single-phase load distribution condition
Table》Data, with reference to nearly half a year low-voltage platform area electricity account, according to branched line adjustment taiwan area user point behind first taiwan area end
Cloth realizes three-phrase burden balance.Along line adjustment heavy workload, efficiency is low；Having a power failure influences user's normal electricity consumption, and power supply is caused to look forward to
Industry economic loss.
For the unbalanced situation of low voltage three-phase, domestic and international many producers develop three-phase imbalance tune and mend device, adopt
Electricity container tune mends principle.The product category is various, and operation principle is similar.Such as there is tune to mend in device equipped with 12 lists
The power capacitor of phase 400V, every capacitor can both be connected between phase line and phase line, also might be used under the control of control terminal
To be connected between phase line and zero curve；Both can realize that angular capacitance was thrown entirely, can also star connection capacitance throw entirely.Every group of angular and star
The capacitance of shape connection respectively has 5 kinds of different connections：1. capacitance is thrown entirely；2. capacitance is not thrown entirely；3. A, B are alternate to throw one group；4. B, C phase
Between throw one group；5. A, C are alternate to throw one group；2 groups of angular and 2 groups of star-star connection modes are shared in the device, according to permutation and combination
Method shares 625 kinds of switching modes；And for the distribution transforming of different capabilities, capacitor group can increase or reduce capacitor group.
By properly in the method for accessing different number capacitor between phase and phase and between each phase and zero curve, make use of the sense of load
Property feature, realize the purpose that uneven watt current is adjusted while power factor is compensated, the compensation rate finally put into
It is identical with the reactive-load compensation amount of system actual needs.
And the idle tune of relevant manufacturers research and development mends device, since the inductive load operating condition in low-voltage network is complicated more
Become so that relatively-stationary capacitor compensation is extremely difficult to ideal effect, energy saving the problem of also tending to cause reactive power releasing system
Harm unobvious drop.On the other hand, TCR branches use 6 pulsation connection types in traditional SVC, contain 6k in line current
± 1 subharmonic (k is positive integer) adds cost, it is necessary to install filter additional.According to currently advanced STATCOM technologies,
Cost is excessively high, in low-pressure system using unreasonable.3rd aspect is adjusted and mends device only in the mains side generation of installation site
Effect, and this product is typically mounted at distribution transforming outlet, and there is huge potential faults and the low-voltage circuit in drop damage space not to have then
Effect, therefore this method is there are significant limitation, is not the development trend that three-phase imbalance administers direction research.
There are many technical and economical problems 1. being administered for three-phase imbalance：
2. low-pressure side load has randomness and dynamic, load has apparent asymmetry, it is difficult to Accurate Prediction；
3. switched capacitor mode compensate three it is load unbalanced, capacitor switching is frequent, and service life is short；
4.SVC has constant-resistance resistance, generates harmonic current, and compensation ability is limited；Advanced SVG is complicated, it is of high cost,
Repair is inconvenient, but the uneven ability of the two improvement is limited, is mainly used for reactive-load compensation；
In conclusion realize that three-phrase burden balance is more difficult by reactive-load compensation, and economy is not high.And tradition adjustment
Balancing the load method cannot meet the needs of the safe and reliable electricity consumption of active user.How reversing arrangement equilibrium low pressure is utilized
Load, it is the main research of this patent to realize the operation of low-voltage platform area three-phrase burden balance.
The content of the invention
In view of the shortcomings of the prior art, the present invention seeks to be to provide a kind of to carry the low of reverse flow technique based on having
The balancing the load control method of distribute-electricity transformer district three is pressed, idle adjust is solved and mends the no thoroughness that device administers three-phase imbalance, to change
Beam condition is at least about to number, utilizes the power load distributing situation in change over switch device adjustment triple line, the reality of economical and efficient
Existing low-pressure side three-phase load is balanced.
To achieve these goals, the present invention is to realize by the following technical solutions：
It is a kind of based on have carry reverse flow technique three balancing the load control methods of low pressure, including：
(1) topology data and load data are read；Line topological structure is returned back out as model using the one of low-voltage platform area, is adopted
Collect the position of the real-time running data of each monitoring point, meter data and reversing switch；
(2) three-phase load unbalance degree is calculated；Three-phase load unbalance degree is detected in real time, and to calculate, it can
It is accurate to calculate three-phase four-wire system, the tri-phase unbalance factor of three-phase three-line system.
(3) judge that three-phase load unbalance degree whether beyond set-point, if beyond set-point, passes through mean iterative method meter
The load for needing to adjust is calculated, is entered step (4)；Otherwise, then terminate, i.e. three-phase load unbalance degree reaches standard value range
It is interior；
(4) judge whether iterations is more than N, wherein N is setting value, and iterations is on-load switch number；If less
In N, then the calculating of mean iterative method is continued through, performs commutation command, reversing switch adjustment has been converted to load commutation control refers to
Order, n+1 return to step of iterations (1)；
Once, a reversing switch carries out once commutation (without commutating during iteration, commutating after iteration) to iteration, repeatedly
Generation number is determined by three-phase imbalance rate, when three-phase imbalance rate is less than set-point, stops iteration；Iterations maximum is
The branch reversing switch number.
If more than N, then the load for needing to adjust is calculated by mean iterative method, then multiple-objection optimization principle, which is drawn, needs
The phase sequence of the reversing switch number and reversing switch to be acted adjustment selects optimal phase sequence to adjust as a result, realizing that three-phase load is put down
Weighing apparatus.
Three balancing the load control methods of a kind of low pressure of the present invention, the tri-phase unbalance factor recommended comprising CIGER
Calculation procedure.Its feature is：The tri-phase unbalance factor of three-phase four-wire system, three-phase three-line system can accurately be calculated.
Three balancing the load control methods of a kind of low pressure of the present invention, include three built based on average value iterative method
Item balancing the load model, feature are：Using reversing switch as computing unit, using phase sequence residing for switch and control load as variable
Establish computation model.
Three balancing the load control methods of a kind of low pressure of the present invention are realized and are commutated comprising average Iteration algorithm
Switch phase sequence adjustment.Its feature is：In limited iterations, maximized by the way that phase sequence adjustment is calculated as a result, realizing
Three-phrase burden balance.
Three balancing the load control methods of a kind of low pressure of the present invention include selection multiple-objection optimization phase sequence adjustment knot
Fruit.Its feature is：Consider commutation number and three-phase load unbalance degree, optimal phase sequence is selected to adjust result.
Three balancing the load control methods of a kind of low pressure of the present invention have been converted to load comprising reversing switch is adjusted
Commutation control instructs.
It is of the present invention a kind of following excellent based on there is the three balancing the load control methods of low pressure for carrying reverse flow technique to have
Point and prominent effect：The topological structure for often returning back out line according to low-voltage platform area establishes model, using reversing switch in outlet as node.
The present invention often returns back out line as model using distribution transformer low-pressure side, and acquisition often returns back out reversing switch on line and controls load
Amount and the position of the switch carry out three-phase load unbalance degree detection in real time and calculate, if tri-phase unbalance factor exceeds set-point, lead to
Crossing mean iterative method and calculating needs the load that adjusts, then multiple-objection optimization principle draw needs action reversing switch number and
The phase sequence of reversing switch adjustment, realizes three-phrase burden balance.The algorithm has taken into full account switch motion number, tri-phase unbalance factor
Etc. factors, ensureing that three load unbalanced degree reach in standard value range, realize switch motion number is minimum, commutation cost most
It is low, meanwhile, it realizes the requirement of load transfer user's uninterrupted power supply, that is, has load reverse flow technique, solve idle tune benefit device and administer
The no thoroughness of three-phase imbalance is at least about beam condition with the number that commutates, using in change over switch device adjustment triple line
Power load distributing situation, the realization low-pressure side three-phase load of economical and efficient are balanced.It is distributed, multi-level based on low-voltage three-phase load
Structure, three-phase load unbalance Optimized model is built using average value iterative method, updates A, B, C, triple line by loop iteration
On power load distributing, realize triple line on load equalization.
Description of the drawings
It is next with reference to the accompanying drawings and detailed description that the present invention will be described in detail；
Fig. 1 is that the low-voltage platform area one of the present invention returns back out the topology diagram of line；
Fig. 2 is the flow chart of the present invention；
Fig. 3 is the average value iterative method calculation flow chart of the present invention of the present invention.
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, with reference to
Specific embodiment, the present invention is further explained.
Referring to Fig. 1-Fig. 3, the present embodiment it is a kind of based on have carry reverse flow technique three balancing the load control methods of low pressure,
Line is often returned back out as model using distribution transformer low-pressure side, acquisition often returns back out reversing switch on line and controls load and the position of the switch,
Detection in real time is carried out to three-phase load unbalance degree to calculate, if tri-phase unbalance factor exceeds set-point, passes through mean iterative method
The load for needing to adjust is calculated, then multiple-objection optimization principle draws the reversing switch number of needs action and reversing switch adjustment
Phase sequence, realize three-phrase burden balance.The algorithm has taken into full account the factors such as switch motion number, tri-phase unbalance factor, is protecting
The load unbalanced degree of card three reaches in standard value range, realizes that switch motion number is minimum, commutation cost is minimum, meanwhile, it is real
The requirement of existing load transfer user's uninterrupted power supply, that is, have load reverse flow technique, solves idle tune benefit device and administers three-phase imbalance
No thoroughness, beam condition is at least about with the number that commutates, utilize change over switch device adjustment triple line on power load distributing feelings
Condition, the realization low-pressure side three-phase load of economical and efficient are balanced.
For the present invention is discussed in detail, it is as follows：
(1) topology data and load data are read；Line topological structure is returned back out as model using the one of low-voltage platform area, is adopted
Collect the position of the real-time running data of each monitoring point, meter data and reversing switch；
(2) three-phase load unbalance degree is calculated；Three-phase load unbalance degree is detected in real time, and to calculate, it can
It is accurate to calculate three-phase four-wire system, the tri-phase unbalance factor of three-phase three-line system.The step of calculating tri-phase unbalance factor is such as
Under：
Three-phase imbalance degree is represented with zero curve average load electric current and three-phase load total current ratio, i.e.,
Wherein, IAThe A phase load electric currents of expression, IBFor B phase load electric currents, ICFor C phase load electric currents, load current and zero
The appropriate expression formula of specific electric load electric current isNeutral line current size is
Three-phase load unbalance degree is represented in the form of three-phase current size, as follows
(3) judge that three-phase load unbalance degree whether beyond set-point, if beyond set-point, passes through mean iterative method meter
The load for needing to adjust is calculated, is entered step (4)；Otherwise, then terminate, i.e. three-phase load unbalance degree reaches standard value range
It is interior；
It is a kind of based on have carry reverse flow technique three balancing the load control methods of low pressure, including：
(1) topology data and load data are read；Line topological structure is returned back out as model using the one of low-voltage platform area, is adopted
Collect the position of the real-time running data of each monitoring point, meter data and reversing switch；
(2) three-phase load unbalance degree is calculated；Three-phase load unbalance degree is detected in real time, and to calculate, it can
It is accurate to calculate three-phase four-wire system, the tri-phase unbalance factor of three-phase three-line system.
(3) judge that three-phase load unbalance degree whether beyond set-point, if beyond set-point, passes through mean iterative method meter
The load for needing to adjust is calculated, is entered step (4)；Otherwise, then terminate, i.e. three-phase load unbalance degree reaches standard value range
It is interior；
Since the computational methods of degree of unbalancedness are different, uneven set-point cannot be according to 2% given in specification.According to
《Overhead distribution and equipment operating standard》The 25% of rated current is not to be exceeded in middle regulation, neutral current.Thus calculate
The unbalanced value for drawing this kind of method is about 10%.
(4) judge whether iterations is more than N, wherein N is setting value, and iterations is on-load switch number；If less
In N, then the calculating of mean iterative method is continued through, performs commutation command, reversing switch adjustment has been converted to load commutation control refers to
Order, n+1 return to step of iterations (1)；
Once, a reversing switch carries out once commutation (without commutating during iteration, commutating after iteration) to iteration, repeatedly
Generation number is determined by three-phase imbalance rate, when three-phase imbalance rate is less than set-point, stops iteration；Iterations maximum is
The branch reversing switch number.
If more than N, then the load for needing to adjust is calculated by mean iterative method, then multiple-objection optimization principle, which is drawn, needs
The phase sequence of the reversing switch number and reversing switch to be acted adjustment selects optimal phase sequence to adjust as a result, realizing that three-phase load is put down
Weighing apparatus.
A kind of three balancing the load control methods of low pressure of the present invention are calculated comprising the CIGER tri-phase unbalance factors recommended
Step can accurately calculate the tri-phase unbalance factor of three-phase four-wire system, three-phase three-line system.And comprising based on average
Be worth iterative method structure three balancing the load models, using reversing switch as computing unit, with phase sequence residing for switch and control load
It measures and establishes computation model for variable.
The average Iteration algorithm of the present invention is realized and the adjustment of reversing switch phase sequence, in limited iterations, passes through meter
Calculation show that phase sequence is adjusted as a result, realizing and maximizes three-phrase burden balance；It uses selection multiple-objection optimization phase sequence adjustment as a result, comprehensive
It closes and considers commutation number and three-phase load unbalance degree, optimal phase sequence is selected to adjust result.
In addition, the present invention, which has been converted to reversing switch adjustment, carries commutation control instruction, line is often returned back out according to low-voltage platform area
Topological structure establish model, using reversing switch in outlet as node.
Distribution, multilayered structure the present invention is based on low-voltage three-phase load are born using average value iterative method structure three-phase
Lotus imbalance Optimized model by the power load distributing in loop iteration update A, B, C, triple line, realizes that load is put down in triple line
Homogenizing.
Referring to Fig. 3, average value iterative method computational methods of the invention are：First according to measurement data, each electricity is calculated
Flow valuve, each current value calculation formula are：
Iφ=sum (Iφt), φ is a phase in ABC three-phases, and t represents the reversing switch that the number in φ phases is t, IφtI.e.
The size of current controlled by t numbering devices in φ phases；Select current best value IΦmax, IΦmin=find (sum (IΦt))；
Finally calculating needs the position of reversing switch, which is：
Wherein, InΔThe maximum electric current of phase and the difference of average value in three-phase current during nth iteration.φ represents No. t and changes
The phase that should be changed to switch, i.e., the phase of current value minimum in three-phase；IφnmaxWhen being nth iteration in three-phase electric current maximum phase
Current value.InaveIt is the average value of three-phase current.
It is of the present invention a kind of following excellent based on there is the three balancing the load control methods of low pressure for carrying reverse flow technique to have
Point and prominent effect：The topological structure that line is often returned back out according to low-voltage platform area establishes model, tri-phase unbalance factor is calculated, in outlet
Reversing switch carries out load transfer for node；Realize that reversing switch action frequency is minimum by average value alternative manner, user supplies
It is electric uninterrupted, power supply safety reliability is improved, reduces line loss caused by three characteristics of the middle term imbalance.
The basic principles, main features and the advantages of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (3)
- It is 1. a kind of based on the low-voltage three-phase load balance control method for having load commutation technology, which is characterized in that its method and step is such as Under：(1) topology data and load data are read；Line topological structure is often returned back out as model using low-voltage platform area, with outlet Upper phase-change switch is node, gathers the position of the real-time running data of each monitoring point, meter data and phase-change switch；(2) three-phase load unbalance degree is calculated；Three-phase load unbalance degree d is detected in real time, and to calculate；(3) judge that three-phase load unbalance degree whether beyond set-point, if beyond set-point, is calculated by mean iterative method The load adjusted is needed, is entered step (4)；Otherwise, then terminate, i.e. three-phase load unbalance degree reaches in standard value range.(4) optimal phase sequence adjustment result is selected；In limited iterations, phase-change switch adjustment load commutation has been converted into Control instruction goes out to need the load adjusted, then be drawn most according to multiple-objection optimization principle by mean iterative method Continuous plus The phase-change switch number of excellent needs action and the phase sequence of phase-change switch adjustment, realize and maximize three-phrase burden balance；In the step (2), calculate tri-phase unbalance factor the step of it is as follows：Three-phase imbalance degree is represented with neutral line current and three-phase load total current ratio, i.e.,Wherein, IAThe A phase load electric currents of expression, IBFor B phase load electric currents, ICFor C phase load electric currents, load current and zero curve electricity The vector expression of stream isNeutral line current size is<mrow> <msub> <mi>I</mi> <mi>n</mi> </msub> <mo>=</mo> <msqrt> <mrow> <msubsup> <mi>I</mi> <mi>A</mi> <mn>2</mn> </msubsup> <mo>+</mo> <msubsup> <mi>I</mi> <mi>B</mi> <mn>2</mn> </msubsup> <mo>+</mo> <msubsup> <mi>I</mi> <mi>C</mi> <mn>2</mn> </msubsup> <mo>-</mo> <msub> <mi>I</mi> <mi>A</mi> </msub> <msub> <mi>I</mi> <mi>B</mi> </msub> <mo>-</mo> <msub> <mi>I</mi> <mi>B</mi> </msub> <msub> <mi>I</mi> <mi>C</mi> </msub> <mo>-</mo> <msub> <mi>I</mi> <mi>C</mi> </msub> <msub> <mi>I</mi> <mi>A</mi> </msub> </mrow> </msqrt> </mrow>Three-phase load unbalance degree is represented in the form of three-phase current size, as follows<mrow> <mi>&delta;</mi> <mo>=</mo> <mfrac> <msqrt> <mrow> <msubsup> <mi>I</mi> <mi>A</mi> <mn>2</mn> </msubsup> <mo>+</mo> <msubsup> <mi>I</mi> <mi>B</mi> <mn>2</mn> </msubsup> <mo>+</mo> <msubsup> <mi>I</mi> <mi>C</mi> <mn>2</mn> </msubsup> <mo>-</mo> <msub> <mi>I</mi> <mi>A</mi> </msub> <msub> <mi>I</mi> <mi>B</mi> </msub> <mo>-</mo> <msub> <mi>I</mi> <mi>B</mi> </msub> <msub> <mi>I</mi> <mi>C</mi> </msub> <mo>-</mo> <msub> <mi>I</mi> <mi>C</mi> </msub> <msub> <mi>I</mi> <mi>A</mi> </msub> </mrow> </msqrt> <mrow> <msub> <mi>I</mi> <mi>A</mi> </msub> <mo>+</mo> <msub> <mi>I</mi> <mi>B</mi> </msub> <mo>+</mo> <msub> <mi>I</mi> <mi>C</mi> </msub> </mrow> </mfrac> <mo>;</mo> </mrow>In the step (4), average value iterative method computational methods are：First according to measurement data, every phase current values are calculated, it should It is per phase current values calculation formula：Iφ=sum (Iφt), t represents the phase-change switch that the number in φ phases is t, IφtT numbers phase-change switch institute as in φ phases The size of current of control；Then three-phase average current value I is calculatedave, select current maxima IφmaxWith current minimum Iφmin, finally calculate Go out to need the position of phase-change switch, which is：<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <msub> <mi>I</mi> <mrow> <mi>n</mi> <mi>&Delta;</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>I</mi> <mrow> <mi>&phi;</mi> <mi>n</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>I</mi> <mrow> <mi>n</mi> <mi>a</mi> <mi>v</mi> <mi>e</mi> </mrow> </msub> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>&lsqb;</mo> <mi>&phi;</mi> <mo>,</mo> <mi>t</mi> <mo>&rsqb;</mo> <mo>=</mo> <mi>f</mi> <mi>i</mi> <mi>n</mi> <mi>d</mi> <mrow> <mo>(</mo> <mi>min</mi> <mo>(</mo> <mrow> <mi>a</mi> <mi>b</mi> <mi>s</mi> <mrow> <mo>(</mo> <mrow> <msub> <mi>I</mi> <mrow> <mi>&phi;</mi> <mi>t</mi> </mrow> </msub> <mo>-</mo> <mi>a</mi> <mi>b</mi> <mi>s</mi> <mrow> <mo>(</mo> <msub> <mi>I</mi> <mrow> <mi>n</mi> <mi>&Delta;</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> <mo>)</mo> </mrow> </mrow> <mo>)</mo> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced>Wherein, InΔThe maximum electric current of phase and the difference of average value in three-phase current during nth iteration；φ represents t phase-change switches The phase of current value minimum in the phase that should be changed, i.e. three-phase；IφnmaxWhen being nth iteration in three-phase the phase of electric current maximum electric current Value, InaveIt is the average value of three-phase current.
- 2. low-voltage three-phase load balance control method according to claim 1, which is characterized in that first in the step (4) Three-phase load computation model was built based on average value iterative method before this, using phase-change switch as computing unit, with residing for phase-change switch Phase sequence establishes computation model with load is controlled for variable.
- 3. low-voltage three-phase load balance control method according to claim 1, which is characterized in that in the step (3) Set-point is 10%.
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| CN201510665595.7A CN105406493B (en) | 2015-10-14 | 2015-10-14 | It is a kind of based on have carry commutation technology low-voltage three-phase load balance control method |
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| CN108695866A (en) * | 2018-07-13 | 2018-10-23 | 珠海英泰利电力技术有限公司 | It is a kind of to wait zero phase-change switch type three-phase load Automatic adjustment method and device |
| CN109103890B (en) * | 2018-09-27 | 2022-07-26 | 云南电网有限责任公司临沧供电局 | Voltage regulation method and system in low-voltage distribution network |
| CN109167376A (en) * | 2018-10-25 | 2019-01-08 | 贵州电网有限责任公司 | A kind of load side three-phase imbalance controlling device and its administering method |
| CN110112760B (en) * | 2019-06-12 | 2020-11-03 | 南方电网科学研究院有限责任公司 | Three-phase unbalance adjusting method and system based on phase change switch and centralized controller |
| CN111509742B (en) * | 2020-05-13 | 2021-07-13 | 广东电网有限责任公司 | Commutation method for three-phase unbalance |
| CN112152237B (en) * | 2020-09-03 | 2022-07-08 | 国电南瑞科技股份有限公司 | Transformer area power quality management method and system based on multi-DFACTS device coordination control |
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