CN110365031A - A kind of Voltage unbalance compensation device and zero sequence current compensation method - Google Patents
A kind of Voltage unbalance compensation device and zero sequence current compensation method Download PDFInfo
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- CN110365031A CN110365031A CN201910670991.7A CN201910670991A CN110365031A CN 110365031 A CN110365031 A CN 110365031A CN 201910670991 A CN201910670991 A CN 201910670991A CN 110365031 A CN110365031 A CN 110365031A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The present invention provides a kind of Voltage unbalance compensation device and zero sequence current compensation method, the Voltage unbalance compensation device includes Z-type transformer, at least one phase-change switch and the terminal control unit that the load-side in power distribution station is arranged, wherein: Z-type transformer and at least one described phase-change switch parallel connection access power grid, each phase-change switch and a load in series, the zero curve of each load are connected with the neutral point of Z-type transformer；Terminal control unit and each phase-change switch communicate to connect, for repeating according to the zero-sequence current of Z-type transformer or every phase load total current of grid side, obtain the step of commutation judges parameter, and after obtaining commutation every time and judging parameter, if judgement knows that commutation judges that parameter is greater than preset value, commutation step is executed.The method is applied to above-mentioned apparatus.Voltage unbalance compensation device and zero sequence current compensation method provided in an embodiment of the present invention improve the service life of phase-change switch and reduce the risk of commutation failure.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of Voltage unbalance compensation devices and zero-sequence current to mend
Compensation method.
Background technique
Electric power is the precondition of all kinds of industry developments, with each high-new as current most widely used energy form
The development of industry and the propulsion of electric Power Reform are also wanted so that power supply should keep up with ever-increasing power capacity demand
It can satisfy higher and higher power supply quality requirement.
Currently, power quality problem is mainly reflected in reactive compensation, harmonic wave control and three-phase imbalance.User is in mostly
The end of power distribution network, and be mostly single-phase load, it is usually unbalanced since three-phase load changes at random, thus
Three phase unbalance current is generated, imbalance of three-phase voltage is caused, to increase line loss, influences the safety fortune of utility network
Row, or even will cause large-area power-cuts；The problems such as also resulting in user equipment damage, scrap of the product, loss of data when serious.It is right
In three phase unbalance current, forward-order current, negative-sequence current and zero-sequence current can be analyzed to.In the end of power distribution network, usually by
Unevenness is distributed in a large amount of single-phase loads, and generates a large amount of zero-sequence current, zero-sequence current is the master for causing imbalance of three-phase voltage
Want reason.In the prior art, zero sequence current compensation can be carried out using the devices such as phase-change switch or Z-type transformer.But commutation
The zero sequence current compensation ability of switch, big by loading effects, as long as three-phase load has imbalance, zero-sequence current be there is, together
When commutation process in there are commutation failure, interval power-off etc. danger；The zero-sequence current of Z-type transformer compensation depends on load zero sequence
The size of electric current easily causes Z-type transformer overcurrent even to damage when load zero-sequence current is excessive.
Summary of the invention
Aiming at the problems existing in the prior art, the embodiment of the present invention provides a kind of Voltage unbalance compensation device and zero sequence
Current compensation method can at least be partially solved problems of the prior art.
In a first aspect, the present invention proposes a kind of Voltage unbalance compensation device, including the load-side setting in power distribution station
Z-type transformer, at least one phase-change switch and terminal control unit, in which:
The Z-type transformer and at least one described phase-change switch parallel connection access power grid, each phase-change switch and one
A load in series, the zero curve of each load are connected with the neutral point of the Z-type transformer；
The terminal control unit and each phase-change switch communicate to connect, for repeating according to the Z-type transformer
Every phase load total current of zero-sequence current or grid side, obtains commutation the step of judge parameter, and changes described in the acquisition every time
After mutually judging parameter, if judgement knows that the commutation judges that parameter is greater than preset value, commutation step is executed.
Second aspect, the present invention provide a kind of zero sequence current compensation of Voltage unbalance compensation device described in above-described embodiment
Method, comprising:
It repeats to obtain commutation judgement ginseng according to the zero-sequence current of Z-type transformer or every phase load total current of grid side
Several steps, and after obtaining the commutation every time and judging parameter, if judgement knows that the commutation judges that parameter is greater than and presets
Value, then execute commutation step；
Wherein, the commutation step includes:
According to every phase load total current, the maximum phase of load total current and the smallest phase of load total current are determined；
Rule is determined according to the maximum phase of the load total current and phase-change switch, and determination needs the commutation for carrying out commutation to open
It closes；Wherein, the phase-change switch determines that rule is preset；
It sends commutation to instruct to needing to carry out the phase-change switch of commutation, so that needing to carry out the phase-change switch of commutation from described
The maximum phase of load total current is switched to the smallest phase of load total current.
The third aspect, the present invention provide a kind of zero sequence current compensation device, comprising:
Repetitive unit is obtained for repeating according to the zero-sequence current of Z-type transformer or every phase load total current of grid side
The step of commutation judges parameter is obtained, and after obtaining the commutation every time and judging parameter, the commutation judgement ginseng is known in judgement
Whether number is greater than preset value；
Commutation unit, for according to every phase load total current, determining after the commutation judges that parameter is greater than preset value
The maximum phase of load total current and the smallest phase of load total current；It is true according to the maximum phase of the load total current and phase-change switch
Set pattern then, determines the phase-change switch for needing to carry out commutation；It sends commutation to instruct to the phase-change switch for needing to carry out commutation, so that needing
The phase-change switch for carrying out commutation is switched to the smallest phase of load total current from the maximum phase of load total current；Its
In, the phase-change switch determines that rule is preset.
Fourth aspect, the present invention provides a kind of electronic equipment, including memory, processor and storage are on a memory and can
The computer program run on a processor, the processor realize zero sequence described in any of the above-described embodiment when executing described program
The step of current compensation method.
Another aspect, the present invention provide a kind of computer readable storage medium, are stored thereon with computer program, the calculating
Machine program realizes the step of zero sequence current compensation method described in any of the above-described embodiment when being executed by processor.
Voltage unbalance compensation device and zero sequence current compensation method provided in an embodiment of the present invention, are included in power distribution station
Load-side setting Z-type transformer, at least one phase-change switch and terminal control unit, Z-type transformer and each phase-change switch are simultaneously
Couple into power grid, the load in series of each phase-change switch and a unidirectional load, in the zero curve and Z-type transformer of each load
Property point be connected, terminal control unit and each phase-change switch communicate to connect, for repeating according to the zero-sequence current of Z-type transformer or
Every phase load total current of grid side obtains the step of commutation judges parameter, and after obtaining commutation every time and judging parameter,
Judgement knows that commutation judges that parameter is greater than after preset value, executes commutation step, compensates in the zero-sequence current to power grid
Meanwhile commutation step is executed in the case where commutation judges that parameter meets condition, the commutation number of phase-change switch is effectively reduced,
It improves the service life of phase-change switch and reduces the risk of commutation failure.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is the structural schematic diagram for the Voltage unbalance compensation device that one embodiment of the invention provides.
Fig. 2 be another embodiment of the present invention provides Voltage unbalance compensation device structural schematic diagram.
Fig. 3 is the flow diagram for the zero sequence current compensation method that one embodiment of the invention provides.
Fig. 4 is the flow diagram for the commutation step that one embodiment of the invention provides.
Fig. 5 is the flow diagram for the zero sequence current compensation method that further embodiment of this invention provides.
Fig. 6 is the flow diagram for the zero sequence current compensation method that yet another embodiment of the invention provides.
Fig. 7 is the structural schematic diagram for the zero sequence current compensation device that one embodiment of the invention provides.
Fig. 8 is the structural schematic diagram for the zero sequence current compensation device that further embodiment of this invention provides.
Fig. 9 is the structural schematic diagram for the zero sequence current compensation device that yet another embodiment of the invention provides.
Figure 10 is the entity structure schematic diagram for the electronic equipment that one embodiment of the invention provides.
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, with reference to the accompanying drawing to this hair
Bright embodiment is described in further details.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
Fig. 1 is the structural schematic diagram for the Voltage unbalance compensation device that one embodiment of the invention provides, as shown in Figure 1, this
The Voltage unbalance compensation device that inventive embodiments provide includes the Z-type transformer 1, at least that the load-side in power distribution station is arranged
One phase-change switch 2 and terminal control unit (not shown), in which:
The access power grid in parallel of Z-type transformer 1, each phase-change switch 2 is in parallel to access the power grid, each phase-change switch 2 with
The load 3 of one unidirectional load is connected, and the zero curve of each load 3 is connected with the neutral point of Z-type transformer 1；
The terminal control unit and each phase-change switch 2 communicate to connect, such as the terminal control unit passes through mobile communication
Network and each phase-change switch 2 communicate to connect, and can inquire the load current of each phase-change switch 2.The terminal control unit can
To obtain the zero-sequence current of Z-type transformer 1, such as the zero-sequence current of Z-type transformer 1 is flowed through using current transformer detection, obtain
To the zero-sequence current of Z-type transformer 1；The terminal control unit can also obtain every phase load total current of the grid side, i.e. A
The load total current of the load total current of phase, the load total current of B phase and C phase.The terminal control unit can be repeated according to Z-type
The zero-sequence current of transformer 1 or every phase load total current of grid side obtain the step of commutation judges parameter, and are obtaining every time
After the commutation judge parameter, the commutation judge that parameter is compared with preset value, if the commutation judges to join
Number is greater than the preset value, then executing commutation step.Wherein, the commutation step is preset；The commutation instruction is pre-
If；The communication connection mode of each phase-change switch 2 and the terminal control unit can be wired connection or wireless connection, root
It is configured according to actual needs, the embodiment of the present invention is without limitation；The preset value is configured according to actual needs, the present invention
Embodiment is without limitation.
At work, the terminal control unit can obtain Z to Voltage unbalance compensation device provided in an embodiment of the present invention
The zero-sequence current of type transformer 1 judges parameter for the zero-sequence current of Z-type transformer 1 as commutation, or obtains the grid side
Every phase load total current, i.e. the load total current of A phase, the load total current of the load total current of B phase and C phase, comparison A phase
The load total current of load total current, the load total current of B phase and C phase obtains load total current maximum value and load total current
The difference that the load total current maximum value subtracts load total current minimum value is judged parameter as the commutation by minimum value.
The terminal control unit judges that parameter compares with preset value after obtaining the commutation every time and judging parameter, by the commutation
Compared with, if the commutation judges that parameter is greater than the preset value, the terminal control unit executes the commutation step, if
The commutation judges that parameter is less than or equal to the preset value, then the terminal control unit no longer executes the commutation step
Suddenly.The terminal control unit can repeat the above process.
The commutation step includes: firstly, the load total current of terminal control unit comparison A phase, the load of B phase are always electric
The load total current with C phase is flowed, therefrom the maximum phase of acquisition load total current and the smallest phase of load total current, such as A phase
Load total current is greater than the load total current of B phase, and the load total current of B phase is greater than the load total current of C phase, and load total current is most
Big is mutually A phase, and the smallest phase of load total current is C phase.Then, the terminal control unit obtains each phase-change switch 3 negative
The load current of the maximum phase of lotus total current, compares each phase-change switch 3 in the load current of the maximum phase of load total current, can
To obtain the smallest phase-change switch 3 of load current, by the smallest phase-change switch 3 of load current as the commutation for needing to carry out commutation
Switch.Then, the terminal control unit sends commutation and instructs to the phase-change switch for needing to carry out commutation, makes to need to carry out commutation
Phase-change switch is switched to the smallest phase of load total current from the maximum phase of load total current, realizes to zero in power grid
Sequence electric current compensates, and reduces the zero-sequence current in the power grid.
The terminal control unit, can be with after judging that the commutation judges that parameter is less than or equal to the preset value
It sends commutation to instruct to Z-type transformer 1, Z-type transformer 1 is made to carry out zero sequence current compensation.Since the commutation judges that parameter is small
In or equal to the preset value, illustrate that the zero-sequence current of Z-type transformer 1 within the tolerance range of Z-type transformer, does not need
Commutation is carried out to any one phase-change switch 3, can be used alone the compensation that Z-type transformer 1 carries out zero-sequence current.
Voltage unbalance compensation device provided in an embodiment of the present invention becomes including the load-side setting Z-type in power distribution station
Depressor, at least one phase-change switch and terminal control unit, Z-type transformer and each phase-change switch parallel connection access power grid, Mei Gehuan
Mutually the load in series of switch and a unidirectional load, the zero curve of each load are connected with the neutral point of Z-type transformer, terminal control
Device and each phase-change switch communicate to connect, for repeating according to the zero-sequence current of Z-type transformer or every phase load of grid side
Total current obtains the step of commutation judges parameter, and after obtaining commutation every time and judging parameter, knows that commutation judges in judgement
Parameter is greater than after preset value, executes commutation step, while the zero-sequence current to power grid compensates, judges to join in commutation
Number executes commutation step in the case where meeting condition, effectively reduces the commutation number of phase-change switch, improves phase-change switch
Service life and the risk for reducing commutation failure.
Fig. 2 be another embodiment of the present invention provides Voltage unbalance compensation device structural schematic diagram, as shown in Fig. 2,
On the basis of the various embodiments described above, further, the terminal control unit includes control unit 4 and communication unit 5, and control is single
Member 4 is connected with communication unit 5, in which:
Control unit 4 can obtain the zero-sequence current of Z-type transformer 1 and every phase of the grid side by current transformer
Load total current.For example, one current transformer of setting obtains Z-type and becomes for detecting the zero-sequence current for flowing through Z-type transformer 1
Then the zero-sequence current of Z-type transformer 1 is reported to control unit 4 by the zero-sequence current of depressor 1；Three current transformers are set
It is respectively used to the load current that every phase of the grid side is flowed through in detection, obtains every phase load total current of the grid side, so
After every phase load total current is reported to control unit 4.
Communication unit 5 can be communicated to connect with each phase-change switch 3, such as communication unit 5 passes through with each phase-change switch 3
Mobile communications network is communicatively coupled, and control unit 4 obtains the load current of each phase-change switch 3, example by communication unit 5
Order is obtained as control unit 4 sends electric current to each phase-change switch 3 respectively by communication unit 5, each phase-change switch 3 receives
After obtaining order to electric current, local load current is sent to communication unit 5, then control list is transmitted to by communication unit 5
Member 4.Wherein, communication unit 5 is selected according to actual communication, and the embodiment of the present invention is without limitation.
Control unit 4 can repeat every phase load total current of zero-sequence current or grid side according to Z-type transformer 1,
Obtain commutation the step of judge parameter, and after obtaining the commutation every time and judging parameter, by the commutation judge parameter and
Preset value is compared, if the commutation judges that parameter is greater than the preset value, executes commutation step.Wherein, it controls
Unit 4 can use PID controller.
For example, control unit 4 can obtain the zero-sequence current of Z-type transformer 1, using the zero-sequence current of Z-type transformer 1 as
Commutation judges parameter, or obtains every phase load total current of the grid side, i.e. the load total current of A phase, the load of B phase is total
The load total current of electric current and C phase compares load total current, the load total current of the load total current of B phase and C phase of A phase, obtains
Load total current maximum value and load total current minimum value are obtained, it is minimum that the load total current maximum value is subtracted load total current
The difference of value judges parameter as the commutation.The commutation is judged that parameter is compared with preset value by control unit 4, if
The commutation judges that parameter is greater than the preset value, then the commutation step is executed, if the commutation judges that parameter is less than
Or it is equal to the preset value, then not executing the commutation step.Control unit 4 can repeat the above process.
Control unit 4 can be sent after judging that the commutation judges that parameter is less than or equal to the preset value
Commutation is instructed to Z-type transformer 1, and Z-type transformer 1 is made to carry out zero sequence current compensation.
Fig. 3 is the flow diagram for the zero sequence current compensation method that one embodiment of the invention provides, as shown in figure 3, this hair
The zero sequence current compensation method using Voltage unbalance compensation device described in any of the above-described embodiment that bright embodiment provides, packet
It includes:
S301, it repeats to obtain commutation according to the zero-sequence current of Z-type transformer or every phase load total current of grid side and sentence
The step of disconnected parameter, and after obtaining the commutation every time and judging parameter, if judgement knows that the commutation judges that parameter is greater than
Preset value then executes commutation step；
Specifically, terminal control unit can obtain the zero-sequence current of Z-type transformer, by the zero sequence electricity of the Z-type transformer
Stream judges parameter as commutation；Alternatively, the terminal control unit can obtain every phase load total current of grid side, i.e. A phase
The load total current of load total current, the load total current of B phase and C phase, it is always electric according to the load total current of A phase, the load of B phase
The load total current of stream and C phase obtains commutation and judges parameter, for example, the terminal control unit is according to the load total current of A phase, B
The load total current of phase and the load total current of C phase obtain the negative of the load total current of A phase, the load total current of B phase and C phase
Load total current maximum value and load total current minimum value in lotus total current subtract the load total current maximum value described
Load total current minimum value obtains difference, judges parameter as the commutation.The terminal control unit can repeat above-mentioned mistake
Journey, repetition obtain the commutation and judge parameter.
The commutation is judged parameter and preset by the terminal control unit after obtaining the commutation every time and judging parameter
Value is compared, if the commutation judges that parameter is greater than the preset value, the terminal control unit executes the commutation
Step.
Fig. 4 is the flow diagram for the commutation step that one embodiment of the invention provides, as shown in figure 4, the commutation step
Include:
S401, according to every phase load total current, determine the maximum phase of load total current and the smallest phase of load total current；
Specifically, the terminal control unit is described after judging that the commutation judges that parameter is greater than the preset value
Terminal control unit compares each phase load total current of the grid side, can obtain the maximum phase of load total current and load is always electric
Flow the smallest phase.Wherein, the preset value can be set to k times of the specified zero-sequence current of the Z-type transformer, and k is greater than 0.5
And less than 1.2, such as k takes the value of 0.9, k can be according to the characteristic sets itself of application and Z-type transformer, and the present invention is real
Apply example without limitation.
For example, the terminal control unit compares each phase load total current of the grid side, if the load total current of A phase
Greater than the load total current of B phase, and the load total current of B phase is greater than the load total current of C phase, then load total current is maximum
It is mutually A phase, the smallest phase of load total current is C phase.
S402, rule is determined according to the maximum phase of the load total current and phase-change switch, determination needs to carry out commutation
Phase-change switch；Wherein, the phase-change switch determines that rule is preset；
Specifically, the terminal control unit is obtaining the maximum phase of load total current and load total current minimum
Phase after, rule is determined according to the maximum phase of the load total current and phase-change switch, can determine to need to carry out commutation
Phase-change switch.Wherein, the phase-change switch determines that rule is preset.
For example, the phase-change switch determines that rule includes: that each phase-change switch of acquisition is maximum in load total current
The load current of phase, and born according to each phase-change switch in the load current of the maximum phase of load total current
The smallest phase-change switch of charged current is as the phase-change switch for needing to carry out commutation.The terminal control unit can obtain each described
It is maximum in load total current to compare each phase-change switch in the load current of the maximum phase of load total current for phase-change switch
The load current of phase can obtain the smallest phase-change switch of load current, using the smallest phase-change switch of load current as needs
Carry out the phase-change switch of commutation.
S403, transmission commutation are instructed to needing to carry out the phase-change switch of commutation, so that needing to carry out the phase-change switch of commutation
The smallest phase of load total current is switched to from the maximum phase of load total current.
Specifically, the terminal control unit is after obtaining and needing to carry out the phase-change switch of commutation, to needing to carry out commutation
Phase-change switch send commutation instruction.After needing the phase-change switch for carrying out commutation to receive the commutation instruction, understand from described
The maximum phase of load total current is switched to the smallest phase of load total current, to reduce the zero-sequence current in the power grid.
Wherein, the commutation instruction is preset.
The principle of zero sequence current compensation method provided in an embodiment of the present invention is illustrated by way of example below.?
In the Voltage unbalance compensation device, the zero-sequence current of Z-type transformer is IZ0, three-phase voltage is respectively Ua、UbAnd Uc, three-phase
Load total current is respectively Ia、IbAnd Ic, i-th of phase-change switch xth to load current be Ixi, wherein i is positive integer and i is small
In being equal to n, n is the total quantity of the phase-change switch, the phase in x a, b c three-phase.There are following relational expressions:
Ia=Ia1+Ia2+…+Ian (1)
Ib=Ib1+Ib2+…+Ibn (2)
Ic=Ic1+Ic2+…+Icn (3)
Three-phase current average value IavAre as follows:
According to IEEE Std.936-1987 standard, three-phase current unbalance degree calculation formula are as follows:
Wherein, PVIRIndicate three-phase current unbalance degree.
Assuming that virtual value size relation are as follows: Ia>Ib>Ic, then three-phase current unbalance degree at this time are as follows:
If the virtual value deviation delta I of a phase and c phaseacAre as follows:
ΔIac=Ia-Ic (7)
So, reference value Δ I ' is setac, make Δ I 'acFor Δ IacHalf, it may be assumed that
Work as IZ0When greater than the preset value, take in a phase load electric current in all phase-change switches closest to Δ I 'acValue,
Filter out in a phase load electric current with Δ I 'acDifference absolute value minimum value, it may be assumed that
min{|Ia1-ΔI′ac|,|Ia2-ΔI′ac|,…,|Ia3-ΔI′ac|} (9)
The corresponding phase-change switch of the minimum value of the absolute value of above-mentioned difference as needs to carry out the phase-change switch of commutation, false
It is set as k-th of phase-change switch, corresponding a phase load electric current is Iak。
K-th of phase-change switch be after from the maximum phase a phase commutation of load total current to the smallest phase c phase of load total current,
Each phase current after commutation is respectively as follows:
I′a=Ia-Iak
I′b=Ib
I′c=Ic+Iak
Three-phase current unbalance degree P ' so after commutationVIRAre as follows:
Contrast equation (6) and (10), it is known that, the three-phase current unbalance degree P ' after commutationVIRLess than the three-phase electricity before commutation
Flow degree of unbalancedness PVIR。
Zero sequence current compensation method provided in an embodiment of the present invention, can repeat according to the zero-sequence current of Z-type transformer or
Every phase load total current of person's grid side obtains the step of commutation judges parameter, and judges parameter obtaining the commutation every time
Later, after judgement knows that the commutation judges that parameter is greater than preset value, commutation step is executed, in the zero-sequence current to power grid
While compensating, commutation step is executed in the case where commutation judges that parameter meets condition, effectively reduces phase-change switch
Commutation number, improve the service life of phase-change switch and reduce the risk of commutation failure.
Fig. 5 is the flow diagram for the zero sequence current compensation method that further embodiment of this invention provides, as shown in figure 5,
On the basis of the various embodiments described above, further, zero sequence current compensation method provided in an embodiment of the present invention further include:
If S501, judgement know that the commutation judges that parameter is less than or equal to the preset value, zero-sequence current is sent
Compensating instruction to the Z-type transformer carries out zero sequence current compensation.
Specifically, the terminal control unit can sentence the commutation after obtaining the commutation every time and judging parameter
Disconnected parameter is compared with the preset value, if the commutation judges that parameter is less than or equal to the preset value, illustrates institute
The zero-sequence current of Z-type transformer is stated within the tolerance range of Z-type transformer, do not need any one phase-change switch into
Row commutation can be used alone the compensation that the Z-type transformer carries out zero-sequence current, the balance of three-phase voltage be realized, then institute
It states terminal control unit transmission zero sequence current compensation to instruct to the Z-type transformer, the Z-type transformer is made to carry out zero-sequence current benefit
It repays.Wherein, the zero sequence current compensation instruction is preset.
Zero sequence current compensation method provided in an embodiment of the present invention, due to judgement know commutation judge parameter be less than or
After preset value, sends zero sequence current compensation and instruct to Z-type transformer progress zero sequence current compensation, limit Z-type transformation
The upper limit value of the zero-sequence current of device compensation, can effectively prevent Z-type transformer overcurrent.Further, first using phase-change switch into
Row zero sequence current compensation reuses Z-type transformer and compensates to remaining zero-sequence current, can be improved balance of voltage degree.
Fig. 6 is the flow diagram for the zero sequence current compensation method that yet another embodiment of the invention provides, as shown in fig. 6, institute
It states and judges that parameter includes: according to the acquisition commutation of every phase load total current of grid side
S3011, every phase load total current according to the grid side obtain load total current maximum value and load total current
Minimum value；
Specifically, the terminal control unit can compare institute after the every phase load total current for obtaining the grid side
The size of every phase load total current of grid side is stated, load current maximum value and load current minimum value are therefrom obtained.
For example, the terminal control unit obtains the load total current of the A phase of the grid side, the load total current of B phase and C
Then the load total current of phase compares load total current, the load total current of the load total current of B phase and C phase of A phase, judgement
The load total current of A phase is greater than the load total current of B phase out, and the load total current of B phase is greater than the load total current of C phase, then
Load current maximum value is the load total current of A phase, and load current minimum value is the load total current of C phase.
S3012, the difference that the load total current maximum value is subtracted to the load total current minimum value, are changed as described
Mutually judge parameter.
Specifically, the terminal control unit obtain the load total current maximum value and the load current minimum value it
Afterwards, the difference that the load total current maximum value subtracts the load current minimum value is calculated, described change is taked the above difference as
Mutually judge parameter.
For example, the terminal control unit obtains the load total current a that load total current maximum value is A phase, load total current
Minimum value is the load total current c of C phase, then calculating e=a-c, obtains difference e, judges to join using difference e as the commutation
Number.
On the basis of the various embodiments described above, further, the phase-change switch determines that rule includes:
Each phase-change switch is obtained in the load current of the maximum phase of load total current, and according to each commutation
The load current in the maximum phase of load total current is switched, the absolute value for obtaining the difference of load current and reference value is minimum
Phase-change switch as the phase-change switch for needing to carry out commutation；Wherein, the reference value subtracts negative for load total current maximum value
The half of the difference of lotus total current minimum value.
Specifically, the terminal control unit can obtain each phase-change switch in the negative of the maximum phase of load total current
Charged current, can also calculate acquisition reference value, and the reference value is that load total current maximum value subtracts load total current minimum value
Difference half.Seek load current and the reference value of each phase-change switch in the maximum phase of load total current
Then the absolute value of difference compares the corresponding above-mentioned absolute value of each phase-change switch, can obtain that absolute value is the smallest to be changed
It mutually switchs, using the smallest phase-change switch of absolute value as the phase-change switch for needing to carry out commutation.
For example, the Voltage unbalance compensation device is provided with five phase-change switches: phase-change switch K1, phase-change switch K2, change
Mutually switch K3, phase-change switch K4With phase-change switch K5.If the maximum phase of load total current is A phase, the terminal control unit can be with
Obtain phase-change switch K1In the load current Ia of A phase1, phase-change switch K2In the load current Ia of A phase2, phase-change switch K3In A phase
Load current Ia3, phase-change switch K4In the load current Ia of A phase4With phase-change switch K5In the load current Ia of A phase5, the terminal
Controller can also obtain the load total current a that load total current maximum value is A phase, and load total current minimum value is the negative of C phase
Lotus total current c, then the reference value r=a-c.Calculate separately again | Ia1- r |, | Ia2- r |, | Ia3- r |, | Ia4- r | and | Ia5-
R |, then compare | Ia1-r|、|Ia2-r|、|Ia3-r|、|Ia4- r | and | Ia5- r |, the smallest absolute value is therefrom obtained, if it is
|Ia3- r |, then phase-change switch K3It is load current closest to the phase-change switch of the reference value, by phase-change switch K3As need
Carry out the phase-change switch of commutation.
Fig. 7 is the structural schematic diagram for the zero sequence current compensation device that one embodiment of the invention provides, as shown in fig. 7, this hair
The zero sequence current compensation device that bright embodiment provides includes repetitive unit 701 and commutation unit 702, in which:
Repetitive unit 701 is used to repeat according to the zero-sequence current of Z-type transformer or every phase load total current of grid side,
The step of commutation judges parameter is obtained, and after obtaining the commutation every time and judging parameter, judges that the commutation judges parameter
Whether preset value is greater than；Commutation unit 702 is used for after the commutation judges that parameter is greater than preset value, according to every phase load
Total current determines the maximum phase of load total current and the smallest phase of load total current；According to the maximum phase of load total current
Rule is determined with phase-change switch, determines the phase-change switch for needing to carry out commutation；Commutation is sent to instruct to needing to carry out changing for commutation
It mutually switchs, so that the phase-change switch for carrying out commutation is needed to be switched to the load total current from the maximum phase of load total current
The smallest phase；Wherein, the phase-change switch determines that rule is preset.
Specifically, repetitive unit 701 can obtain the zero-sequence current of Z-type transformer, by the zero sequence electricity of the Z-type transformer
Stream judges parameter as commutation；Alternatively, repetitive unit 701 can obtain every phase load total current of grid side, the i.e. load of A phase
The load total current of total current, the load total current of B phase and C phase, according to the load total current of A phase, the load total current of B phase and
The load total current of C phase obtains commutation and judges parameter, for example, repetitive unit 701 is according to the load total current of A phase, the load of B phase
The load total current of total current and C phase obtains load total current, the load total current of the load total current of B phase and C phase of A phase
In load total current maximum value and load total current minimum value, it is always electric that the load total current maximum value is subtracted into the load
Stream minimum value obtains difference, judges parameter as the commutation.Repetitive unit 701 can repeat the above process, repeat to obtain
The commutation judges parameter.Repetitive unit 701 judges parameter after obtaining the commutation every time and judging parameter, by the commutation
It is compared with preset value, judges that the commutation judges whether parameter is greater than the preset value, if the commutation parameter is greater than
The preset value executes commutation step by commutation unit 702.
Commutation unit 702 compares each phase of the grid side after the commutation judges that parameter is greater than the preset value
Load total current can obtain the maximum phase of load total current and the smallest phase of load total current.Wherein, the preset value can be with
It is set as k times of the specified zero-sequence current of the Z-type transformer, k is greater than 0.5 and less than 1.2, for example k takes the value of 0.9, k can
According to the characteristic sets itself of application and Z-type transformer, the embodiment of the present invention is without limitation.
After obtaining the maximum phase of load total current and the smallest phase of load total current, commutation unit 702
Rule is determined according to the maximum phase of the load total current and phase-change switch, can determine that the commutation for carrying out commutation is needed to open
It closes.Wherein, the phase-change switch determines that rule is preset.
After obtaining and needing to carry out the phase-change switch of commutation, commutation unit 702 is to the phase-change switch for needing to carry out commutation
Send commutation instruction.It, can be from the load total current after needing the phase-change switch for carrying out commutation to receive the commutation instruction
Maximum phase is switched to the smallest phase of load total current, to reduce the zero-sequence current in the power grid.Wherein, described to change
Mutually instruction is preset.
Zero sequence current compensation device provided in an embodiment of the present invention, can repeat according to the zero-sequence current of Z-type transformer or
Every phase load total current of person's grid side obtains the step of commutation judges parameter, and judges parameter obtaining the commutation every time
Later, after judgement knows that the commutation judges that parameter is greater than preset value, commutation step is executed, in the zero-sequence current to power grid
While compensating, commutation step is executed in the case where commutation judges that parameter meets condition, effectively reduces phase-change switch
Commutation number, improve the service life of phase-change switch and reduce the risk of commutation failure.
Fig. 8 is the structural schematic diagram for the zero sequence current compensation device that further embodiment of this invention provides, as shown in figure 8,
On the basis of the various embodiments described above, further, zero sequence current compensation device provided in an embodiment of the present invention further includes that judgement is single
Member 703, in which:
Judging unit 703 is used for after judgement knows that the commutation judges that parameter is less than or equal to the preset value,
Zero sequence current compensation is sent to instruct to Z-type transformer progress zero sequence current compensation.
Specifically, after obtaining the commutation every time and judging parameter, the commutation can be judged to join by judging unit 703
Number is compared with the preset value, if the commutation judges that parameter is less than or equal to the preset value, illustrates the Z-type
The zero-sequence current of transformer does not need to change any one phase-change switch within the tolerance range of Z-type transformer
Phase can be used alone the compensation that the Z-type transformer carries out zero-sequence current, realize the balance of three-phase voltage, then judgement is single
Member 703 sends zero sequence current compensation and instructs to the Z-type transformer, and the Z-type transformer is made to carry out zero sequence current compensation.Its
In, the zero sequence current compensation instruction is preset.
Zero sequence current compensation device provided in an embodiment of the present invention, due to judgement know commutation judge parameter be less than or
After preset value, sends zero sequence current compensation and instruct to Z-type transformer progress zero sequence current compensation, limit Z-type transformation
The upper limit value of the zero-sequence current of device compensation, can effectively prevent Z-type transformer overcurrent.Further, first using phase-change switch into
Row zero sequence current compensation reuses Z-type transformer and compensates to remaining zero-sequence current, can be improved balance of voltage degree.
Fig. 9 is the structural schematic diagram for the zero sequence current compensation device that yet another embodiment of the invention provides, as shown in figure 9,
On the basis of the various embodiments described above, further, repetitive unit 701, which specifically includes, obtains subelement 7011 and computation subunit
7012, in which:
Subelement 7011 is obtained for every phase load total current according to the grid side, obtains load total current maximum value
With load total current minimum value；Computation subunit 7012 is used to the load total current maximum value subtracting the load total current
Minimum value obtains difference, judges parameter as the commutation.
Specifically, after the every phase load total current for obtaining the grid side, institute can be compared by obtaining subelement 7011
The size of every phase load total current of grid side is stated, load current maximum value and load current minimum value are therefrom obtained.
After obtaining the load total current maximum value and the load current minimum value, computation subunit 7012 calculates institute
The difference that load total current maximum value subtracts the load current minimum value is stated, the commutation judgement ginseng is taked the above difference as
Number.
On the basis of the various embodiments described above, further, the phase-change switch determines that rule includes:
Each phase-change switch is obtained in the load current of the maximum phase of load total current, and according to each commutation
The load current in the maximum phase of load total current is switched, the absolute value for obtaining the difference of load current and reference value is minimum
Phase-change switch as the phase-change switch for needing to carry out commutation；Wherein, the reference value subtracts negative for load total current maximum value
The half of the difference of lotus total current minimum value.
Specifically, commutation unit 702 can obtain each phase-change switch in the load of the maximum phase of load total current
Electric current, can also calculate acquisition reference value, and the reference value is that load total current maximum value subtracts load total current minimum value
The half of difference.Each phase-change switch is sought in the load current of the maximum phase of load total current and the difference of the reference value
Then the absolute value of value compares the corresponding above-mentioned absolute value of each phase-change switch, can obtain the smallest commutation of absolute value
Switch, using the phase-change switch of the smallest phase-change switch of absolute value as the phase-change switch for needing to carry out commutation.
The embodiment of device provided in an embodiment of the present invention specifically can be used for executing the processing of above-mentioned each method embodiment
Process, details are not described herein for function, is referred to the detailed description of above method embodiment.
Figure 10 is the entity structure schematic diagram for the electronic equipment that one embodiment of the invention provides, as shown in Figure 10, the electronics
Equipment may include: processor (processor) 1001, communication interface (Communications Interface) 1002, deposit
Reservoir (memory) 1003 and communication bus 1004, wherein processor 1001, communication interface 1002, memory 1003 pass through logical
Letter bus 1004 completes mutual communication.Processor 1001 can call the logical order in memory 1003, to execute such as
Lower method: it repeats to obtain commutation according to the zero-sequence current of Z-type transformer or every phase load total current of grid side and judge parameter
The step of, and after obtaining the commutation every time and judging parameter, if judgement knows that the commutation judges that parameter is greater than preset value,
Then execute commutation step；Wherein, the commutation step includes: to determine that load total current is maximum according to every phase load total current
Phase and the smallest phase of load total current；Rule is determined according to the maximum phase of the load total current and phase-change switch, is determined and is needed
Carry out the phase-change switch of commutation；Wherein, the phase-change switch determines that rule is preset；Commutation is sent to instruct to being changed
The phase-change switch of phase, so that the phase-change switch for carrying out commutation is needed to be switched to the load from the maximum phase of load total current
The smallest phase of total current.
In addition, the logical order in above-mentioned memory 1003 can be realized by way of SFU software functional unit and conduct
Independent product when selling or using, can store in a computer readable storage medium.Based on this understanding, originally
Substantially the part of the part that contributes to existing technology or the technical solution can be in other words for the technical solution of invention
The form of software product embodies, which is stored in a storage medium, including some instructions to
So that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation of the present invention
The all or part of the steps of example the method.And storage medium above-mentioned include: USB flash disk, mobile hard disk, read-only memory (ROM,
Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. it is various
It can store the medium of program code.
The present embodiment discloses a kind of computer program product, and the computer program product includes being stored in non-transient calculating
Computer program on machine readable storage medium storing program for executing, the computer program include program instruction, when described program instruction is calculated
When machine executes, computer is able to carry out method provided by above-mentioned each method embodiment, for example, repeats according to Z-type transformation
The zero-sequence current of device or every phase load total current of grid side obtain the step of commutation judges parameter, and are obtaining institute every time
It states after commutation judges parameter, if judgement knows that the commutation judge that parameter greater than preset value, executes commutation step；Wherein,
The commutation step includes: to determine that the maximum phase of load total current and load total current are the smallest according to every phase load total current
Phase；Rule is determined according to the maximum phase of the load total current and phase-change switch, determines the phase-change switch for needing to carry out commutation；Its
In, the phase-change switch determines that rule is preset；It sends commutation to instruct to the phase-change switch for needing to carry out commutation, so that needing
The phase-change switch for carrying out commutation is switched to the smallest phase of load total current from the maximum phase of load total current.
The present embodiment provides a kind of computer readable storage medium, the computer-readable recording medium storage computer journey
Sequence, the computer program make the computer execute method provided by above-mentioned each method embodiment, for example, repeat root
According to the zero-sequence current of Z-type transformer or every phase load total current of grid side, the step of commutation judges parameter is obtained, and every
After the secondary acquisition commutation judges parameter, if judgement knows that the commutation judges that parameter is greater than preset value, commutation step is executed
Suddenly；Wherein, the commutation step includes: to determine that the maximum phase of load total current and load are always electric according to every phase load total current
Flow the smallest phase；Rule is determined according to the maximum phase of the load total current and phase-change switch, and determination needs to carry out changing for commutation
Mutually switch；Wherein, the phase-change switch determines that rule is preset；Commutation is sent to instruct to needing the commutation for carrying out commutation to open
It closes, so that the phase-change switch for carrying out commutation is needed to be switched to the load total current minimum from the maximum phase of load total current
Phase.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
In the description of this specification, reference term " one embodiment ", " specific embodiment ", " some implementations
Example ", " such as ", the description of " example ", " specific example " or " some examples " etc. mean it is described in conjunction with this embodiment or example
Particular features, structures, materials, or characteristics are included at least one embodiment or example of the invention.In the present specification,
Schematic expression of the above terms may not refer to the same embodiment or example.Moreover, the specific features of description, knot
Structure, material or feature can be combined in any suitable manner in any one or more of the embodiments or examples.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (12)
1. a kind of Voltage unbalance compensation device, which is characterized in that the Z-type transformation including the load-side setting in power distribution station
Device, at least one phase-change switch and terminal control unit, in which:
The Z-type transformer and at least one described phase-change switch parallel connection access power grid, and each phase-change switch and one bear
Series connection is carried, the zero curve of each load is connected with the neutral point of the Z-type transformer；
The terminal control unit and each phase-change switch communicate to connect, for repeating the zero sequence according to the Z-type transformer
Every phase load total current of electric current or grid side obtains the step of commutation judges parameter, and sentences obtaining the commutation every time
After disconnected parameter, if judgement knows that the commutation judges that parameter is greater than preset value, commutation step is executed.
2. imbalance compensation device according to claim 1, which is characterized in that the terminal control unit includes control unit
And communication unit, described control unit are connected with the communication unit, in which:
The communication unit and each phase-change switch communicate to connect, and described control unit becomes for repeating according to the Z-type
Every phase load total current of the zero-sequence current of depressor or the grid side, obtains the step of commutation judges parameter, and
It is obtained after the commutation judges parameter every time, if judgement knows that the commutation judge that parameter greater than preset value, executes commutation
Step.
3. a kind of zero sequence current compensation method using any one of claims 1 or 2 Voltage unbalance compensation device, special
Sign is, comprising:
It repeats to obtain commutation according to the zero-sequence current of Z-type transformer or every phase load total current of grid side and judge parameter
Step, and after obtaining the commutation every time and judging parameter, if judgement knows that the commutation judges that parameter is greater than preset value,
Execute commutation step；
Wherein, the commutation step includes:
According to every phase load total current, the maximum phase of load total current and the smallest phase of load total current are determined；
Rule is determined according to the maximum phase of the load total current and phase-change switch, determines the phase-change switch for needing to carry out commutation；
Wherein, the phase-change switch determines that rule is preset；
It sends commutation to instruct to needing to carry out the phase-change switch of commutation, so that needing to carry out the phase-change switch of commutation from the load
The maximum phase of total current is switched to the smallest phase of load total current.
4. according to the method described in claim 3, it is characterized by further comprising:
If judgement knows that the commutation judge parameter less than or equal to the preset value, send zero sequence current compensation instruct to
The Z-type transformer carries out zero sequence current compensation.
5. according to the method described in claim 3, it is characterized in that, described changed according to every phase load total current of grid side
Mutually judge that parameter includes:
According to every phase load total current of the grid side, load total current maximum value and load total current minimum value are obtained；
The difference that the load total current maximum value is subtracted to the load total current minimum value judges to join as the commutation
Number.
6. according to the described in any item methods of claim 3 to 5, which is characterized in that the phase-change switch determines that rule includes:
Each phase-change switch is obtained in the load current of the maximum phase of load total current, and according to each phase-change switch
In the load current of the maximum phase of load total current, the absolute value of the difference of acquisition load current and reference value is the smallest to be changed
Mutually switch is as the phase-change switch for needing to carry out commutation；Wherein, the reference value is that subtract load total for load total current maximum value
The half of the difference of current minimum.
7. a kind of zero sequence current compensation device characterized by comprising
Repetitive unit is changed for repeating according to the zero-sequence current of Z-type transformer or every phase load total current of grid side
The step of mutually judging parameter, and after obtaining the commutation every time and judging parameter, judge that the commutation judges whether parameter is big
In preset value；
Commutation unit, for according to every phase load total current, determining load after the commutation judges that parameter is greater than preset value
The maximum phase of total current and the smallest phase of load total current；Rule are determined according to the maximum phase of the load total current and phase-change switch
Then, the phase-change switch for needing to carry out commutation is determined；Commutation is sent to instruct to needing to carry out the phase-change switch of commutation so that need into
The phase-change switch of row commutation is switched to the smallest phase of load total current from the maximum phase of load total current；Wherein, institute
It states phase-change switch and determines that rule is preset.
8. device device according to claim 7, which is characterized in that further include:
Judging unit, for sending zero after judgement knows that the commutation judges that parameter is less than or equal to the preset value
Sequence current compensation instructs to the Z-type transformer and carries out zero sequence current compensation.
9. device according to claim 7, which is characterized in that the repetitive unit further include:
Subelement is obtained, for every phase load total current according to the grid side, obtains load total current maximum value and load
Total current minimum value；
Computation subunit obtains difference for the load total current maximum value to be subtracted the load total current minimum value, as
The commutation judges parameter.
10. device according to any one of claims 7 to 9, which is characterized in that the phase-change switch determines that rule includes:
Each phase-change switch is obtained in the load current of the maximum phase of load total current, and according to each phase-change switch
In the load current of the maximum phase of load total current, the absolute value of the difference of acquisition load current and reference value is the smallest to be changed
Mutually switch is as the phase-change switch for needing to carry out commutation；Wherein, the reference value is that subtract load total for load total current maximum value
The half of the difference of current minimum.
11. a kind of electronic equipment including memory, processor and stores the calculating that can be run on a memory and on a processor
Machine program, which is characterized in that the processor realizes the step of any one of claim 3 to 6 the method when executing described program
Suddenly.
12. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
The step of any one of claim 3 to 6 the method is realized when execution.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| SU1169077A1 (en) * | 1983-06-30 | 1985-07-23 | Inst Elektrodinamiki | Symmetrizing-balancing device for three-phase power networks with neutral wire |
| CN202008919U (en) * | 2011-03-18 | 2011-10-12 | 杭州得诚电力科技有限公司 | Zigzag transformer for low-voltage distribution network |
| CN105552939A (en) * | 2016-03-07 | 2016-05-04 | 山东电工电气集团新能科技有限公司 | Three-phase unbalance governance system and method |
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