CN107069798A - The control method and its system of distributed photovoltaic power generation system - Google Patents
The control method and its system of distributed photovoltaic power generation system Download PDFInfo
- Publication number
- CN107069798A CN107069798A CN201710031358.4A CN201710031358A CN107069798A CN 107069798 A CN107069798 A CN 107069798A CN 201710031358 A CN201710031358 A CN 201710031358A CN 107069798 A CN107069798 A CN 107069798A
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- current
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- contactor
- inverter
- phase
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- 238000010248 power generation Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000000052 comparative effect Effects 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of control method of distributed photovoltaic power generation control system, current line current value is gathered from the current transformer of each three-phase transformer low-pressure side, the current signal of collection is then delivered into PLC through current transducer；Size of current to each phase is contrasted, and takes wherein minimum value as reference value, the reference value is compared with preset value, is decided whether to carry out inverter and supply line's switching control according to comparative result；Also disclose a kind of distributed photovoltaic power generation control system, can be according to different circuits and current power situation by the present invention, A.C. contactor is controlled to switch photovoltaic power supply circuit in time by PLC, and then solve reflux problem, realize that photovoltaic electric energy makes full use of, simultaneously by the automatic switchover between transformer, play a part of adjusting power.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation, and in particular to a kind of controlling party of distributed photovoltaic power generation control system
Method and its system.
Background technology
Distributed photovoltaic power generation, which refers to, uses photovoltaic module, and solar energy is converted directly into the distributed generation system of electric energy.
It is a kind of new, tool generating with broad prospects for development and comprehensive utilization of energy mode, advocates and generates electricity nearby, nearby simultaneously
Net, is changed nearby, the principle used nearby, can not only effectively improve the generated energy of same size photovoltaic plant, is also had simultaneously
Effect solves the problems, such as loss of the electric power in boosting and long-distance transport.Distributed photovoltaic power generation system is realized by combining inverter
Grid-connected output, in order to keep higher generating efficiency, inverter is usually three-phase symmetrical output and forces control in power factor
For 1 state.
Because power supply load is typically change, occur that bearing power is less than photovoltaic when distributed photovoltaic power generation is grid-connected
The situation of generated output, can cause, to power network loopback energy, reflux problem occur.On the other hand, when three-phase injustice occurs in load
During weighing apparatus, due to inverter output be force three-phase equilibrium, can cause one mutually or two phase countercurrent flow and another phase or two-phase are light
Lie prostrate the situation of power supply.Such case can be caused when occurring electric energy be difficult to measure and using occur detrimental effect, for example with
Electric energy metrical problem between family and power network, the electric energy metrical between user and user, while to the control of power factor also band
Carry out very big inconvenience.It is therefore prevented that adverse current, is the major issue of new energy application using photovoltaic energy to greatest extent.
The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of control method of distributed photovoltaic power generation control system
And its system.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
The embodiment of the present invention provides a kind of control method of distributed photovoltaic power generation control system, and this method is：From each three-phase
Current line current value is gathered in the current transformer of step down side, then through current transducer by the current signal of collection
Deliver to PLC；Size of current to each phase is contrasted, and takes wherein minimum value as reference value, the reference value and preset value
It is compared, is decided whether to carry out inverter and supply line's switching control according to comparative result.
It is described to be decided whether to carry out inverter and supply line's switching control according to comparative result in such scheme, specifically
For：When the current line current value of collection is more than preset value, then corresponding A.C. contactor, the light of correspondence power grade are connected
Volt inverter is then powered to this circuit.
It is described that the current signal of collection is delivered into PLC through current transducer in such scheme, be specially：The PLC is received
It is to the analog quantity current signal of collection, analog quantity current signal is real for the three-phase current of current institute's Acquisition Circuit by AD conversion
Border current value, and pass through minimum value in the relatively three-phase current of each step down side as the bar of A.C. contactor break-make
Part, when the minimum value in the three-phase current of step down side reaches preset value, input is selected according to the scope of current value
The inverter of different capacity；When there is phase current zero in the circuit powered, the power of now photovoltaic output has been represented
More than the power of load consumption, then the A.C. contactor of the circuit is automatically cut off, while inverter output is switched into it
His loaded line.
The embodiment of the present invention provides a kind of distributed photovoltaic power generation control system, and the system includes several inverters, often
An individual inverter air switch of connecting does breaker to carrying out break-make control between inverter and load, each air switch it
Connect respectively afterwards and connect the different load supplying circuits of correspondence, A.C. contactor after multiple A.C. contactors, A.C. contactor respectively
It is connected with PLC Q ports.
In such scheme, the output end of each inverter connects A.C. contactor respectively, and the A.C. contactor divides again
Be not connected with the low-pressure side of transformer, the Q terminals of the PLC are connected with the coil of auxiliary reclay, auxiliary reclay again with friendship
The coil series connection of contactor is flowed, the normally-closed contact of different A.C. contactors and other A.C. contactors is normally opened under same inverter
Contact series, are formed mechanical interlocked；The A.C. contactor normally opened contact and corresponding PLC I terminal series-shunts, work as to feed back
Preceding A.C. contactor state.
In such scheme, the PLC is realized by dedicated telephone line and man-machine interface needed for data exchange and operation, PLC
24V dc sources in secondary side three-phase of the Switching Power Supply through transformer any phase obtain.
In such scheme, the LCD that the controller PLC is circumscribed with monitoring and changeable supply line and inverter in real time shows
Show device and keyboard.
Compared with prior art, beneficial effects of the present invention：
The present invention controls A.C. contactor to be supplied to switch photovoltaic in time according to different circuits and current power situation by PLC
Electric line, and then reflux problem is solved, realize that photovoltaic electric energy makes full use of, while by the automatic switchover between transformer, rising
To the effect of adjustment power.
Brief description of the drawings
Fig. 1 is collection load current signal figure in the present invention；
PLC control system structure chart in Fig. 2 present invention；
Fig. 3 is this hair system construction drawing.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention provides a kind of control method of distributed photovoltaic power generation control system, and this method is：From each
Current line current value is gathered in the current transformer of three-phase transformer low-pressure side, then through current transducer by the electric current of collection
Signal delivers to PLC；Size of current to each phase is contrasted, and takes wherein minimum value as reference value, the reference value with it is pre-
If value is compared, decided whether to carry out inverter and supply line's switching control according to comparative result.
It is described to be decided whether to carry out inverter and supply line's switching control according to comparative result, be specially：When collection
When current line current value is more than preset value, then corresponding A.C. contactor is connected, the photovoltaic DC-to-AC converter of correspondence power grade is then
This circuit is powered.
It is described that the current signal of collection is delivered into PLC through current transducer, be specially：The PLC receives the mould of collection
Analog quantity current signal, by analog quantity current signal by three-phase current actual current value of the AD conversion for current institute's Acquisition Circuit,
And minimum value works as transformation as the condition of A.C. contactor break-make in the three-phase current for passing through relatively more each step down side
When minimum value in the three-phase current of device low-pressure side reaches preset value, selected to put into different capacity according to the scope of current value
Inverter；When there is phase current zero in the circuit powered, represent that the power of now photovoltaic output has been above load and disappeared
The power of consumption, then automatically cut off the A.C. contactor of the circuit, while inverter output is switched into other loaded lines.
As shown in figure 1, from the D.C mutual-inductor leading-out terminal extracted current of 1#, 2# Three-Phase Transformer low-pressure side
Signal is into the current transducer of PLC control system, while being followed by ammeter in transformer, is not influenceing the use electric energy of original system
While metering PLC also can normal acquisition to loading current current signal under 1#, 2# transformer.
As shown in Fig. 2 1#, 2# step-down side three-phase electricity flow valuve that PLC is collected, through PLC moulds
The current value of collection is sent in PLC by analog quantity module.Current values of the PLC according to program setting according to certain rule again to reading
Size contrast is carried out, is connect using the minimum value in 1#, 2# step down side three-phase current as switching exchange
The condition of tentaculum, and the current value that PLC is collected by display screen include in man-machine interface, at any time observe 1#,
The electric current dynamic of 2# loads.
Situation about being likely to occur：
1st, when certain circuit has accessed photovoltaic power supply, if the line load changes, switched according to the current value collected and closed
The inverter of suitable power grade disconnects corresponding A.C. contactor.
2nd, 1#, 2# are worked as, when 3# inverters all access supply line, if there is other loaded lines
When reaching the requirement of switching inverter, then now PLC changeover programs are invalid, and A.C. contactor does not perform action.
3rd, working as has had part to access supply line in 1#, 2#, 3# inverters, for reaching that switching is required
Supply line, most suitable inverter may access other supply lines, then the current value that PLC is collected is according to program
The inverter of setting access suboptimum power grade is to the circuit.
4th, when there is a plurality of line transformer secondary side current to meet the same power grade inverter requirement of switching, exchange connects
Tentaculum then carries out the input of inverter according to the load priority of program setting, and supply line's input of highest priority is most suitable
The inverter of power grade, All other routes are by that analogy.
The embodiment of the present invention also provides a kind of distributed photovoltaic power generation control system, as shown in figure 3, the system is including some
Individual inverter, one air switch of each inverter series connection does breaker to carrying out break-make control between inverter and load, often
Connect respectively after individual air switch and connect the different load supplying lines of correspondence after multiple A.C. contactors, A.C. contactor respectively
Road, A.C. contactor and PLC Q ports connection.
According to the minimum value of 1#, 2# three-phase current, corresponding exchange is automatically controlled to connect by PLC
The action of tentaculum, such as：K 11、K12、K21、K22A.C. contactor is controlled by the signal of Q output mouthful,
The signal of output is fed back by I input ports, man-machine interface is connected with PLC by connection, can also can by man-machine interface
Ordered with being sent to PLC, control A.C. contactor is logical manually or disconnects.
The output end of each inverter connects A.C. contactor respectively, the A.C. contactor again respectively with transformer
Low-pressure side is connected, and the Q terminals of the PLC are connected with the coil of auxiliary reclay, the line of auxiliary reclay again with A.C. contactor
The different normally-closed contacts of A.C. contactor are connected with the normally opened contact of other A.C. contactors under circle series connection, same inverter, shape
Into mechanical interlocked；The A.C. contactor normally opened contact and corresponding PLC I terminal series-shunts, to feed back current ac contactor
Device state.
The PLC realizes the 24V direct currents needed for data exchange and operation, PLC by dedicated telephone line and man-machine interface
Source any phase in secondary side three-phase of the Switching Power Supply through transformer is obtained.
The controller PLC is circumscribed with the LCD display and keyboard of monitoring and changeable supply line and inverter in real time
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (7)
1. a kind of control method of distributed photovoltaic power generation control system, it is characterised in that：This method is：From each three phase-change pressure
Current line current value is gathered in the current transformer of device low-pressure side, then the current signal of collection is delivered to through current transducer
PLC；Size of current to each phase is contrasted, and takes wherein minimum value as reference value, and the reference value is carried out with preset value
Compare, decided whether to carry out inverter and supply line's switching control according to comparative result.
2. a kind of distributed photovoltaic power generation control system collocation method according to claim 1, it is characterised in that：Described
Decide whether to carry out inverter and supply line's switching control according to comparative result, be specially：When the current line current value of collection
During more than preset value, then corresponding A.C. contactor is connected, the photovoltaic DC-to-AC converter of correspondence power grade is then powered to this circuit.
3. a kind of distributed photovoltaic power generation control system collocation method according to claim 2, it is characterised in that：The warp
The current signal of collection is delivered to PLC by current transducer, is specially：The PLC receives the analog quantity current signal of collection, will
Analog quantity current signal passes through three-phase current actual current value of the AD conversion for current institute's Acquisition Circuit, and by relatively more each
In the three-phase current of step down side minimum value as A.C. contactor break-make condition, when the three-phase electricity of step down side
When minimum value in stream reaches preset value, selected to put into the inverter of different capacity according to the scope of current value；When being powered
Circuit in when having phase current zero, represent that the power of now photovoltaic output has been above the power of load consumption, then from
The dynamic A.C. contactor for cutting off the circuit, while inverter output is switched into other loaded lines.
4. a kind of distributed photovoltaic power generation control system according to claim 3, it is characterised in that：The system includes some
Individual inverter, one air switch of each inverter series connection does breaker to carrying out break-make control between inverter and load, often
Connect respectively after individual air switch and connect the different load supplying lines of correspondence after multiple A.C. contactors, A.C. contactor respectively
Road, A.C. contactor and PLC Q ports connection.
5. a kind of distributed photovoltaic power generation control system according to claim 4, it is characterised in that：Each inverter
Output end connect A.C. contactor respectively, the A.C. contactor is connected with the low-pressure side of transformer respectively again, the Q of the PLC
Terminal is connected with the coil of auxiliary reclay, and auxiliary reclay is connected with the coil of A.C. contactor again, under same inverter not
Connect, formed mechanical interlocked with the normally opened contact of other A.C. contactors with the normally-closed contact of A.C. contactor；The exchange connects
Tentaculum normally opened contact and corresponding PLC I terminal series-shunts, to feed back current A.C. contactor state.
6. a kind of distributed photovoltaic power generation control system according to claim 4 or 5, it is characterised in that：The PLC passes through
Dedicated telephone line and man-machine interface realize 24V dc sources needed for data exchange and operation, PLC by Switching Power Supply through transformer
Secondary side three-phase in any phase obtain.
7. a kind of distributed photovoltaic power generation control system according to claim 6, it is characterised in that：The controller PLC
It is circumscribed with the LCD display and keyboard of monitoring and changeable supply line and inverter in real time.
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| CN201710031358.4A CN107069798B (en) | 2017-01-17 | 2017-01-17 | Control method and system for distributed photovoltaic power generation system |
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| CN201710031358.4A CN107069798B (en) | 2017-01-17 | 2017-01-17 | Control method and system for distributed photovoltaic power generation system |
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