CN107508323A - A kind of low-voltage platform area distributed photovoltaic access capability appraisal procedure and assessment system - Google Patents
A kind of low-voltage platform area distributed photovoltaic access capability appraisal procedure and assessment system Download PDFInfo
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Abstract
The invention discloses a kind of low-voltage platform area distributed photovoltaic access capability appraisal procedure and assessment system.The problem of evaluation of power supply capability difficulty after access a large amount of middle-size and small-size distributed photovoltaic, particularly families are accessed with photovoltaic be present in existing low-voltage network.The present invention is equivalent to the two-port network of endpoint node by first section, equivalent network parameters are calculated using input/output state at different moments, influence of the distributed photovoltaic to this node and first section voltage can be calculated in low-voltage platform area in the case of distribution network line parameter circuit value not obtaining, change simultaneously increases more parallel operation of transformers or the simple planning and designing mode using the parallel newly-built special power distribution network of distributed photovoltaic in the past, and power distribution network overall investment is reduced by the current capacity of accurate evaluation low-voltage network.
Description
Technical field
It is specifically a kind of based on port etc. the invention belongs to the planning field of distributed photovoltaic access low-voltage network
The low-voltage platform area distributed photovoltaic access capability appraisal procedure and assessment system of effect.
Background technology
China's poverty alleviation develops rapidly with family distributed photovoltaic, and State Grid Corporation of China decontrols according to national policy to this and connect
Enter, but have in Practical Project that access capacity is excessive, add the intermittent fluctuation that distributed photovoltaic accesses regional voltage, portion
Divide there occurs voltage out-of-limit, so as to have impact on the common electric voltage quality in low-voltage platform area.
Therefore, it is domestic about scholar from the control mode of distributed photovoltaic body, medium voltage side space truss project or disappear on the spot
Receive etc. conducts a research, but have ignored the planning of power distribution network in low-voltage platform area, still lacks and receives distribution to low-voltage platform area
The assessment of photovoltaic ability, so as to cause excess investment in engineering, such as increase more parallel operation of transformers or using parallel new
The special power distribution network of distributed photovoltaic is built, reflects in the investment of photovoltaic access low-voltage network and lacks asking for effective assessment tool
Topic.
The content of the invention
Confession after being accessed for existing low-voltage network at access a large amount of middle-size and small-size distributed photovoltaic, particularly families with photovoltaic
The problem of electric energy force estimation difficulty, the present invention provide a kind of low-voltage platform area distributed photovoltaic access capability equivalent based on port and assessed
Method, with the current capacity of accurate evaluation low-voltage network, reduce the overall investment of low-voltage network.
Therefore, the present invention adopts the following technical scheme that：A kind of low-voltage platform area distributed photovoltaic access capability appraisal procedure,
It comprises the following steps：
1) low-voltage platform area with photovoltaic generation access is chosen, family electric energy meter is read by the collector of low-voltage platform area
Customs Assigned Number, watt current, reactive current and voltage data, the active electricity of step down side is read by Distribution transformer
Stream, reactive current and voltage data, it is desirable to which total data is once called, and is ensured data while property, is ignored communication delay；
2) all single-phase or three-phase electric energy meter watt current, reactive current, electricity in the low-voltage platform area that storage is called every time
Data, Customs Assigned Number and markers are pressed, is accurate to minute；
3) read and store all single-phase or three-phase electric energy meter current transformer ratio in low-voltage platform area, a sub-value is made
Allow the maximum current I of access for node ii_max；
4) files on each of customers is inquired about by all single-phase or three-phase electric energy meter Customs Assigned Number in low-voltage platform area, determines the node i
The type of user, including without generating electricity, generate power for their own use and fully surf the Net；
5) using low-voltage platform area transformer outlet as head end, the first section and node i at 2 moment are obtained in data storage
Watt current, reactive current, voltage data, Customs Assigned Number and markers, it is desirable to two groups of data differ, calculate i-th of node
Equivalent two port parameter between head end；
6) watt current, reactive current and the voltage data of the first section at moment at high noon day in the Spring Equinox are chosen, by the maximum of node i
Current value Ii_maxAs watt current, reactive current is set to zero, passes through the equivalent two port parameter calculate node i's of acquisition
Whether voltage meets within 220V 10% deviation up and down, the electric current maximum access capability if meeting as the node, is discontented with
It is sufficient then with 5% be step-length reduce watt current, until meet；
7) user type as associated by Customs Assigned Number in low-voltage platform area, statistic of classification without photovoltaic generation, online in full and
The latching current sum generated power for their own use, as the access capability index of all types of user.
As the supplement of above-mentioned technical proposal, in described step 5), equivalent two port uses T-shaped network.
As the supplement of above-mentioned technical proposal, the solution formula of the equivalent two port parameter is as follows：
In formula,Respectively first moment two ports voltage and current value, Respectively second moment two ports voltage and current value, symbol first subscript numbering be end
Mouth numbering, second subscript numbering of symbol is to number constantly；
Z1, Z2, Z3Three equiva lent impedances of respectively T-shaped network.
As the supplement of above-mentioned technical proposal, in described step 6), the voltage of node i is calculated by following formula：
In formula,The electric current flowed into for first port,It is the electric current that output port flows into for second port,For
The voltage of Two-port netwerk.
As the supplement of above-mentioned technical proposal, in described step 5), it is desirable to which the particular content that two groups of data differ is：
Judge that the watt currents of two groups of data, the relative difference of reactive current whether within 10%, if it is delete one of which,
New one group is read, until the watt current of two groups of data, relative difference >=10% of reactive current.
It is a further object of the present invention to provide a kind of low-voltage platform area distributed photovoltaic access capability assessment system, it includes：
Data read module：The low-voltage platform area with photovoltaic generation access is chosen, is read by the collector of low-voltage platform area
Customs Assigned Number, watt current, reactive current and the voltage data of family electric energy meter, it is low that transformer is read by Distribution transformer
Press side watt current, reactive current and voltage data, it is desirable to which total data is once called, and is ensured data while property, is ignored logical
Letter delay；
Data memory module：Store all single-phase or three-phase electric energy meter watt current in the low-voltage platform area called every time,
Reactive current, voltage data, Customs Assigned Number and markers, are accurate to minute；
Node accesses maximum current chosen module：Read and store all single-phase or three-phase electric energy meter electricity in low-voltage platform area
Current transformer no-load voltage ratio, the maximum current I of access is allowed using a sub-value as node ii_max；
Node users determination type module：Used by all single-phase or three-phase electric energy meter Customs Assigned Number inquiry in low-voltage platform area
Family archives, determine the type of node i user, including without generating electricity, generate power for their own use and fully surf the Net；
Equivalent two port parameter calculating module：Using low-voltage platform area transformer outlet as head end, in data storage
Watt current, reactive current, voltage data, Customs Assigned Number and the markers of the middle first section and node i for obtaining 2 moment, it is desirable to two
Group data differ, and calculate the equivalent two port parameter between i-th of node and head end；
Electric current maximum access capability determining module：Choose watt current, the reactive current of the first section at moment at high noon day in the Spring Equinox
And voltage data, by the maximum current value I of node ii_maxAs watt current, reactive current is set to zero, passes through the equivalent of acquisition
Whether Two-port Network Parameters calculate node i voltage meets within 220V 10% deviation up and down, and the section is used as if meeting
The electric current maximum access capability of point, it is unsatisfactory for being then that step-length reduces watt current with 5%, until meeting；
Access capability index computing module：User type as associated by Customs Assigned Number in low-voltage platform area, statistic of classification without
Photovoltaic generation, the latching current sum in full surfed the Net and generated power for their own use, as the access capability index of all types of user.
It is the device have the advantages that as follows：The present invention is equivalent to the two-port network of endpoint node by first section, profit
Equivalent network parameters are calculated with input/output state at different moments, are not obtaining distribution network line parameter circuit value in low-voltage platform area
In the case of can calculate influence of the distributed photovoltaic to this node and first section voltage, while change and increase more transformers in the past simultaneously
Row operation or the simple planning and designing mode using the parallel newly-built special power distribution network of distributed photovoltaic, are matched somebody with somebody by accurate evaluation low pressure
The current capacity of power network reduces power distribution network overall investment.
Brief description of the drawings
Fig. 1 is the structural representation of T-shaped network in the embodiment of the present invention 1；
Fig. 2 is the schematic flow sheet of the embodiment of the present invention 1.
Embodiment
Embodiment 1
The present embodiment is a kind of low-voltage platform area distributed photovoltaic access capability appraisal procedure, and it comprises the following steps：
1) low-voltage platform area with photovoltaic generation access is chosen, family electric energy meter is read by the collector of low-voltage platform area
Customs Assigned Number, watt current, reactive current and voltage data, the active electricity of step down side is read by Distribution transformer
Stream, reactive current and voltage data, it is desirable to which total data is once called, and is ensured data while property, is ignored communication delay.
2) all single-phase or three-phase electric energy meter watt current, reactive current, electricity in the low-voltage platform area that storage is called every time
Data, Customs Assigned Number and markers are pressed, is accurate to minute.
3) read and store all single-phase or three-phase electric energy meter current transformer ratio in low-voltage platform area, a sub-value is made
Allow the maximum current I of access for node ii_max。
4) files on each of customers is inquired about by all single-phase or three-phase electric energy meter Customs Assigned Number in low-voltage platform area, determines the node i
The type of user, including without generating electricity, generate power for their own use and fully surf the Net.
5) using low-voltage platform area transformer outlet as head end, the first section and node i at 2 moment are obtained in data storage
Watt current, reactive current, voltage data, Customs Assigned Number and markers, judge the watt currents of two groups of data, reactive current
Relative difference if it is deletes one of which whether within 10%, reads new one group, until the active electricity of two groups of data
Stream, relative difference >=10% of reactive current, calculate the equivalent two port parameter between i-th of node and head end；It is equivalent
Two-port network uses T-shaped network, and the solution formula of the equivalent two port parameter is as follows：
In formula,Respectively first moment two ports voltage and current value, Respectively second moment two ports voltage and current value, symbol first subscript numbering be end
Mouth numbering, second subscript numbering of symbol is to number constantly；
Z1, Z2, Z3Three equiva lent impedances of respectively T-shaped network.
6) watt current, reactive current and the voltage data of the first section at moment at high noon day in the Spring Equinox are chosen, by the maximum of node i
Current value Ii_maxAs watt current, reactive current is set to zero, passes through the equivalent two port parameter calculate node i's of acquisition
Whether voltage meets within 220V 10% deviation up and down, the electric current maximum access capability if meeting as the node, is discontented with
It is sufficient then with 5% be step-length reduce watt current, until meet；The voltage of node i is calculated by following formula：
In formula,The electric current flowed into for first port,It is the electric current that output port flows into for second port,For
The voltage of Two-port netwerk.
7) user type as associated by Customs Assigned Number in low-voltage platform area, statistic of classification without photovoltaic generation, online in full and
The latching current sum generated power for their own use, as the access capability index of all types of user.
Embodiment 2
The present embodiment is a kind of low-voltage platform area distributed photovoltaic access capability assessment system, and it includes：
Data read module：The low-voltage platform area with photovoltaic generation access is chosen, is read by the collector of low-voltage platform area
Customs Assigned Number, watt current, reactive current and the voltage data of family electric energy meter, it is low that transformer is read by Distribution transformer
Press side watt current, reactive current and voltage data, it is desirable to which total data is once called, and is ensured data while property, is ignored logical
Letter delay；
Data memory module：Store all single-phase or three-phase electric energy meter watt current in the low-voltage platform area called every time,
Reactive current, voltage data, Customs Assigned Number and markers, are accurate to minute；
Node accesses maximum current chosen module：Read and store all single-phase or three-phase electric energy meter electricity in low-voltage platform area
Current transformer no-load voltage ratio, the maximum current I of access is allowed using a sub-value as node ii_max；
Node users determination type module：Used by all single-phase or three-phase electric energy meter Customs Assigned Number inquiry in low-voltage platform area
Family archives, determine the type of node i user, including without generating electricity, generate power for their own use and fully surf the Net；
Equivalent two port parameter calculating module：Using low-voltage platform area transformer outlet as head end, in data storage
Watt current, reactive current, voltage data, Customs Assigned Number and the markers of the middle first section and node i for obtaining 2 moment, it is desirable to two
Group data differ, and calculate the equivalent two port parameter between i-th of node and head end；
Electric current maximum access capability determining module：Choose watt current, the reactive current of the first section at moment at high noon day in the Spring Equinox
And voltage data, by the maximum current value I of node ii_maxAs watt current, reactive current is set to zero, passes through the equivalent of acquisition
Whether Two-port Network Parameters calculate node i voltage meets within 220V 10% deviation up and down, and the section is used as if meeting
The electric current maximum access capability of point, it is unsatisfactory for being then that step-length reduces watt current with 5%, until meeting；
Access capability index computing module：User type as associated by Customs Assigned Number in low-voltage platform area, statistic of classification without
Photovoltaic generation, the latching current sum in full surfed the Net and generated power for their own use, as the access capability index of all types of user.
Above-described embodiment is the description of the invention, is not limitation of the invention, it is any to simple transformation of the present invention after
Scheme belong to protection scope of the present invention.
Claims (10)
1. a kind of low-voltage platform area distributed photovoltaic access capability appraisal procedure, it is characterised in that comprise the following steps：
1) low-voltage platform area with photovoltaic generation access is chosen, the user of family electric energy meter is read by the collector of low-voltage platform area
Numbering, watt current, reactive current and voltage data, step down side watt current, nothing are read by Distribution transformer
Work(electric current and voltage data, it is desirable to which total data is once called, and is ensured data while property, is ignored communication delay；
2) all single-phase or three-phase electric energy meter watt current, reactive current, voltage number in the low-voltage platform area that storage is called every time
According to, Customs Assigned Number and markers, minute is accurate to；
3) read and store all single-phase or three-phase electric energy meter current transformer ratio in low-voltage platform area, using a sub-value as section
Point i allows the maximum current I of accessi_max；
4) files on each of customers is inquired about by all single-phase or three-phase electric energy meter Customs Assigned Number in low-voltage platform area, determines node i user
Type, including without generating electricity, generate power for their own use and fully surf the Net；
5) using low-voltage platform area transformer outlet as head end, 2 first sections at moment and having for node i are obtained in data storage
Work(electric current, reactive current, voltage data, Customs Assigned Number and markers, it is desirable to which two groups of data differ, and calculate i-th of node and head
Equivalent two port parameter between end；
6) watt current, reactive current and the voltage data of the first section at moment at high noon day in the Spring Equinox are chosen, by the maximum current of node i
Value Ii_maxAs watt current, reactive current is set to zero, passes through the equivalent two port parameter calculate node i of acquisition voltage
Whether meet within 220V 10% deviation up and down, the electric current maximum access capability if meeting as the node, be unsatisfactory for then
It is that step-length reduces watt current with 5%, until meeting；
7) user type as associated by Customs Assigned Number in low-voltage platform area, statistic of classification is without photovoltaic generation, online in full and spontaneous
Personal latching current sum, as the access capability index of all types of user.
2. distributed photovoltaic access capability appraisal procedure in low-voltage platform area according to claim 1, it is characterised in that described
In step 5), equivalent two port uses T-shaped network.
3. distributed photovoltaic access capability appraisal procedure in low-voltage platform area according to claim 2, it is characterised in that described etc.
The solution formula for imitating Two-port Network Parameters is as follows：
In formula,Respectively first moment two ports voltage and current value,
Respectively second moment two ports voltage and current value, symbol first subscript numbering be port numbering, symbol
Second subscript numbering is to number constantly；
Z1, Z2, Z3Three equiva lent impedances of respectively T-shaped network.
4. distributed photovoltaic access capability appraisal procedure in low-voltage platform area according to claim 3, it is characterised in that described
In step 6), the voltage of node i is calculated by following formula：
In formula,The electric current flowed into for first port,The electric current flowed into for second port,It is output port for second port
Voltage.
5. distributed photovoltaic access capability appraisal procedure in low-voltage platform area according to claim 1, it is characterised in that described
In step 5), it is desirable to which the particular content that two groups of data differ is：Judge the watt currents of two groups of data, reactive current it is relative
Difference if it is deletes one of which whether within 10%, reads new one group, until the watt current of two groups of data,
Relative difference >=10% of reactive current.
A kind of 6. low-voltage platform area distributed photovoltaic access capability assessment system, it is characterised in that including：
Data read module：The low-voltage platform area with photovoltaic generation access is chosen, family is read by the collector of low-voltage platform area and used
Customs Assigned Number, watt current, reactive current and the voltage data of electric energy meter, step down side is read by Distribution transformer
Watt current, reactive current and voltage data, it is desirable to which total data is once called, and is ensured data while property, is ignored communication and prolong
Late；
Data memory module：Store all single-phase or three-phase electric energy meter watt current in the low-voltage platform area called every time, idle
Electric current, voltage data, Customs Assigned Number and markers, are accurate to minute；
Node accesses maximum current chosen module：Read and to store all single-phase or three-phase electric energy meter electric current in low-voltage platform area mutual
Sensor no-load voltage ratio, the maximum current I of access is allowed using a sub-value as node ii_max；
Node users determination type module：By all single-phase or three-phase electric energy meter Customs Assigned Number inquiry user's shelves in low-voltage platform area
Case, determines the type of node i user, including without generating electricity, generate power for their own use and fully surf the Net；
Equivalent two port parameter calculating module：Using low-voltage platform area transformer outlet as head end, obtained in data storage
Take the first section at 2 moment and watt current, reactive current, voltage data, Customs Assigned Number and the markers of node i, it is desirable to two groups of numbers
According to differing, the equivalent two port parameter between i-th of node and head end is calculated；
Electric current maximum access capability determining module：Choose watt current, reactive current and the electricity of the first section at moment at high noon day in the Spring Equinox
Data are pressed, by the maximum current value I of node ii_maxAs watt current, reactive current is set to zero, passes through equivalent two end of acquisition
Whether mouthful network parameter calculate node i voltage meet within 220V 10% deviation up and down, as satisfaction then as the node
Electric current maximum access capability, it is unsatisfactory for being then that step-length reduces watt current with 5%, until meeting；
Access capability index computing module：User type as associated by Customs Assigned Number in low-voltage platform area, statistic of classification is without photovoltaic
Generate electricity, the latching current sum in full surfed the Net and generated power for their own use, as the access capability index of all types of user.
7. distributed photovoltaic access capability assessment system in low-voltage platform area according to claim 6, it is characterised in that described
In equivalent two port parameter calculating module, equivalent two port uses T-shaped network.
8. distributed photovoltaic access capability assessment system in low-voltage platform area according to claim 7, it is characterised in that described etc.
The solution formula for imitating Two-port Network Parameters is as follows：
In formula,Respectively first moment two ports voltage and current value, Respectively second moment two ports voltage and current value, symbol first subscript numbering be end
Mouth numbering, second subscript numbering of symbol is to number constantly；
Z1, Z2, Z3Three equiva lent impedances of respectively T-shaped network.
9. distributed photovoltaic access capability assessment system in low-voltage platform area according to claim 3, it is characterised in that described
In electric current maximum access capability determining module, the voltage of node i is calculated by following formula：
In formula,The electric current flowed into for first port,It is the electric current that output port flows into for second port,For second port
Voltage.
10. distributed photovoltaic access capability assessment system in low-voltage platform area according to claim 1, it is characterised in that described
Equivalent two port parameter calculating module in, it is desirable to the particular content that two groups of data differ is：Judge two groups of data
Watt current, the relative difference of reactive current if it is delete one of which whether within 10%, read new one group,
Until the watt current of two groups of data, relative difference >=10% of reactive current.
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| CN106849154A (en) * | 2016-11-29 | 2017-06-13 | 国网冀北电力有限公司承德供电公司 | A kind of photovoltaic plant node harmonic voltage and harmonic source sensitivity relation analysis method |
| CN106549376A (en) * | 2016-12-08 | 2017-03-29 | 东北大学 | The branch road comprehensive stability appraisal procedure of power distribution network containing DG based on equivalent node method |
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