CN106410854B - The Collaborative Control device and its control method of collecting and distributing type grid-connected photovoltaic system - Google Patents
The Collaborative Control device and its control method of collecting and distributing type grid-connected photovoltaic system Download PDFInfo
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Abstract
A kind of Collaborative Control device of collecting and distributing type grid-connected photovoltaic system is made of separate unit concentrated gird-connected inverter and more MPPT header box common DC bus.Voltage code module is added in concentrated gird-connected inverter, voltage code module is located on the common DC bus of separate unit concentrated gird-connected inverter side, and one end connects DC bus, and the other end connects more MPPT header boxs.Voltage decoding module is added in each MPPT header box, and voltage decoding module is located on the DC bus of header box side, and multiple voltage decoding modules are correspondingly connected with a voltage code module.Voltage code module exports the common DC bus voltage given value for adjusting inverter to inverter CPU according to the present instruction of concentrated gird-connected inverter, controls common DC bus voltage change, and regulating command is conveyed to MPPT header box in the form of a voltage；Voltage decoding module identifies issued dispatch command according to header box DC bus-bar voltage, and exporting control instruction executes header box.
Description
Technical field
The present invention relates to the control devices and its controlling party of a kind of collecting and distributing type grid-connected photovoltaic system of common DC bus
Method, in particular to synthetic operation between a concentrated gird-connected inverter and the more header boxs with maximal power tracing function
Task schedule control device and control method.
Background technique
It is existing by a concentrated gird-connected inverter 102 and more compared with conventional centralized grid-connected photovoltaic system
Platform has the collection that the header box 101 of maximal power tracing (Maximum Power Point Tracking, MPPT) function forms
Formula grid-connected photovoltaic system is dissipated, there is higher system generating efficiency, better system economy, gradually by industry weight
Depending on.As shown in Figure 1, in the collecting and distributing type grid-connected photovoltaic system, the more header boxs 101 with maximal power tracing function
DC output end connect with the direct-flow input end of a concentrated gird-connected inverter 102, form collecting and distributing type parallel network power generation
System common DC bus 103 realizes the transmission of remote DC energy.The control target of concentrated gird-connected inverter 102 is
Stablize 103 voltage of common DC bus, the more header boxs 101 with maximal power tracing function are responsible for carrying out by illumination condition
MPPT, and power is sent to common DC bus 103, concentrated gird-connected inverter 102 is to stablize 103 electricity of common DC bus
Pressure, will be automatically performed conveying of the electric energy to public electric wire net 106.
But due to the limitation of equipment room physical distance 104, the Collaborative Control between header box and inverter is caused to become collection
The key for dissipating the performance boost of formula grid-connected photovoltaic system not can guarantee data transmission by traditional telecommunication line 105
Rapidity.Collecting and distributing type grid-connected photovoltaic system product and document mostly use greatly the Collaborative Control side based on telecommunication at present
Formula, single information transmission period is more than hundred Milliseconds, it is difficult to which response speed needed for reaching control closed loop can not achieve
Ideal system control strategy.Especially the active output of limitation is assigned to collecting and distributing type grid-connected photovoltaic system in public power system
After power dispatching instruction, it is difficult to reach traditional concentrated grid-connected system and fast and accurately respond effect.
Summary of the invention
It is slow the purpose of the present invention is overcoming prior art control information to convey, it is difficult to realize lacking for closed loop Collaborative Control
Point proposes a kind of cooperative control method of collecting and distributing type grid-connected photovoltaic system.
The Collaborative Control device of collecting and distributing type grid-connected photovoltaic system of the present invention is separate unit concentrated gird-connected inverter and more
The collecting and distributing type grid-connected photovoltaic system of platform MPPT header box common DC bus composition, using DC bus-bar voltage as task tune
The information linking road of degree system.
The voltage code module that the present invention is added in concentrated gird-connected inverter, the voltage code module are located at single
On the common DC bus of platform concentrated gird-connected inverter side, one end connects DC bus, and the other end is separately connected more MPPT
Header box.For voltage code module according to the present instruction state of the concentrated gird-connected inverter of input, Xiang Dantai concentrated is grid-connected
Inverter CPU output adjusts the common DC bus voltage given value of the inverter side, controls common DC bus voltage change,
And the instruction for adjusting common DC bus voltage given value is conveyed to each MPPT header box in the form of a voltage.
Voltage decoding module is added in the present invention in each MPPT header box.The voltage decoding module is located at confluence
On the DC bus of case side.Multiple voltage decoding modules are correspondingly connected with a voltage code module, according to MPPT header box direct current
Busbar voltage identifies the issued dispatch command of concentrated gird-connected inverter, using this dispatch command as the defeated of MPPT header box
Enter, output control instruction runs MPPT header box according to this dispatch command, including header box start and stop, limit power, low-voltage
It passes through, suspend mode etc..Thus the present invention can carry out coding-control, collaboration to DC bus-bar voltage by concentrated gird-connected inverter
The real time information for controlling the more header boxs with maximal power tracing (MPPT) function is assigned and task schedule.
The information transmitting of common DC bus voltage has rapidity, real-time and continuity, meanwhile, it is based on high-power energy
The constructed information transfer system of amount flowing compares the vulnerability to jamming that the modes such as serial communication have height, is not required to consider electromagnetic compatibility
Etc. factors.Additionally due to reducing equipment cost without setting up dedicated interconnection line.
Using in collecting and distributing type grid-connected photovoltaic system of the invention, more MPPT header boxs are simultaneously according to respectively connecting
Photovoltaic module environment carries out MPPT tracking, provides the maximum power of photovoltaic module to common DC bus, while translating according to voltage
The instruction of code module is acted.Energy inversion in common DC bus is transported to power grid by concentrated gird-connected inverter, control
DC bus-bar voltage processed is stablized on the given value that voltage code module exports.Voltage code module is issued according to needed for inverter
Scheduling information provides common DC bus voltage given value.Voltage decoding module is according to common DC bus voltage value, to MPPT
Header box provides issued dispatch command.
The present invention is DC bus-bar voltage to the control object of concentrated gird-connected inverter, the control pair to MPPT header box
As making concentrated between the two by voltage code module and voltage decoding module realization Collaborative Control for photovoltaic output power
Gird-connected inverter can be indirectly controlled the output power for the photovoltaic module that MPPT header box is connected.
Voltage code module and voltage decoding module is added in collecting and distributing type grid-connected photovoltaic system in the present invention, and MPPT is converged
Stream case is included in the control object of concentrated gird-connected inverter, using common DC bus as concentrated gird-connected inverter to remittance
The link for flowing case transmission tasks scheduling information, controls the change of common DC bus voltage value by way of simple encoding and decoding
Change, makes header box by the identification to common DC bus voltage, execute corresponding scheduler task.Scheduler task includes header box
The linear continuous variations such as the logical orders and output power clipping instruction such as start and stop.
Steps are as follows for control method of the present invention:
1, control target is determined
Firstly, determining that the control target of collecting and distributing type grid-connected photovoltaic system be that collecting and distributing type grid-connected photovoltaic system is total
Output power.For this purpose, the control target of concentrated gird-connected inverter is common DC bus voltage；The control of voltage code module
Target is common DC bus voltage given value；The control target of voltage decoding module be according to common DC bus voltage value,
Provide instruction needed for MPPT header box；The control target of MPPT header box is to carry out photovoltaic module maximal power tracing, and execute
The instruction such as " limit power ", " starting ", " shutdown ", " low voltage crossing ", " system suspend mode ".
2, the coding region of common DC bus voltage is divided
Secondly, being uniform enconding area and non-uniform encoding area by common DC bus voltage division.Uniform enconding area and non-
Uniform enconding area is in collecting and distributing type grid-connected photovoltaic system operational envelope.The uniform enconding area is located at public
In ± 5% range of DC bus-bar voltage rated value, for the voltage regime of collecting and distributing type grid-connected photovoltaic system normal operation；
The non-uniform encoding area is to run in short-term within the scope of the 90%-95% range and 105%-110% of voltage rating for equipment
Permission voltage regime.Uniform enconding area is a consecutive variations for transmitting the instruction of photovoltaic output power clipping, the instruction
Digital quantity is transmitted by controlling the consecutive variations of common DC bus voltage.Non-uniform encoding area for transmit " starting ",
The logical actions such as " shutdown ", " low voltage crossing ", " system suspend mode ", instruction transmitting form are the public of short time phase step type variation
DC bus-bar voltage.
3, coding rule is designed
The movement of operation common DC bus voltage and MPPT header box when assigning information for unified concentrated inverter
Performed movement, needs to design coding rule after identification common DC bus voltage.The coding rule is respectively by voltage code
Module and voltage decoding module realize, voltage code module by control DC bus-bar voltage coding, voltage decoding module according to
The case where common DC bus voltage, issues header box action command, that is, realizes decoding.Table 1 show designed collecting and distributing type system
Common DC bus voltage control coding schedule unite, it is specified that each instruction and common DC bus voltage operation mode.
1 collecting-distributing system common DC bus voltage of table controls coding schedule
4, concentrated gird-connected inverter is controlled
In collecting and distributing type grid-connected photovoltaic system operational process, concentrated gird-connected inverter passes through received electric system
The instructions such as " limitation active power output " that background monitoring is assigned, " remotely open/shut down " and concentrated gird-connected inverter are local
The information such as software and hardware self test failure, inverter gross output summarize the voltage code module into concentrated gird-connected inverter,
DC bus-bar voltage given value is exported by voltage code module, then through conventional DC voltage, alternating current double-closed-loop control, it is real
Existing grid-connected output.
When collecting and distributing type grid-connected photovoltaic system operates normally, the DC bus-bar voltage of voltage code module output is given
Value is in uniform enconding area, and assigned information is the control information of linear change, such as output power clipping.Voltage code mould at this time
Block can recognize the power that concentrated gird-connected inverter is conveyed to power grid, to judge whether output power is excessively high, if output power
It is excessively high, then the reduction of common DC bus voltage is controlled, MPPT header box identifies common DC bus electricity by voltage decoding module
After pressure drop is low, output power is accordingly lowered.
The present invention is brought into using MPPT header box as executing agency in the control system of concentrated gird-connected inverter itself,
Voltage code module, voltage code are added in the concentrated gird-connected inverter control loop of traditional collecting and distributing type grid-connected system
Module uses proportional, integral (PI) adjuster with anti-saturation function, and feedback quantity is system output power, and output quantity is direct current
Busbar voltage given value.The addition of voltage code module makes concentrated gird-connected inverter directly control collecting and distributing type parallel network power generation
The output power of system reaches complete closed-loop control effect.The method of this LINEAR CONTINUOUS closed-loop control can avoid more remittances
Case individual difference, photovoltaic module individual difference, equipment Recognition Different equal error are flowed, and improves control information and assigns speed, from
And quickly and accurately control collecting and distributing type grid-connected photovoltaic system output power.
When voltage code module identifies entire collecting and distributing type grid-connected photovoltaic system failure, low voltage crossing, start and stop
When the logic states such as machine, control common DC bus voltage enters non-uniform encoding area, passes through the step to DC bus-bar voltage
Formula control makes MPPT header box execute command adapted thereto: control common DC bus voltage is higher than 107%pu or is lower than 93%pu,
MPPT header box hard stop；Control common DC bus voltage rises twice in succession within the scope of 106%-108%pu, then
MPPT header box enters low voltage crossing state, stops power output immediately, quickly extensive after the recovery of common DC bus voltage
Again to output power before；Concentrated gird-connected inverter control common DC bus voltage connects within the scope of 92%-94%pu
Continuous to decline twice, MPPT header box enters dormant state, if collecting and distributing type grid-connected photovoltaic system is still not after one section of delay
Starting is then shut down.In addition, when concentrated gird-connected inverter control common DC bus voltage enters the linear of 95%-105%pu
Behind code area, start command is first carried out in MPPT header box, then executes corresponding output power adjusting movement.This logical order
Assign mode, advantage is to ensure that rapidity, avoids the communication interference issues in high-power electric and electronic system, makes to control
The communication reliability of instruction improves a grade.
Thus, voltage code module of the present invention contains collecting and distributing type grid-connected photovoltaic system output power line
Property closed-loop control and non-linear logistic control function, corresponding collecting and distributing type grid-connected photovoltaic system common DC bus voltage fortune
Row is in uniform enconding area and non-uniform encoding area, i.e., voltage code module is according to the various upper location supervisories of input instruction and inverse
Become device local state, exports the inverter gross output instruction in corresponding situation, carry out linearly or nonlinearly closed loop control respectively
System.
5, the specific control method of MPPT header box is worked out
In collecting and distributing type grid-connected photovoltaic system operational process, known first by the voltage decoding module in MPPT header box
Other common DC bus voltage instructs to provide to open/shut down with power dispatching etc., by MPPT module carry out maximum power with
It accordingly executes while track, then is controlled through the common PV voltage close loop of traditional MPPT header box, realize the overall operation of header box.
The method of above-mentioned collecting and distributing type grid-connected photovoltaic system gross output LINEAR CONTINUOUS closed-loop control can avoid more
Header box individual difference, photovoltaic module individual difference, equipment Recognition Different equal error, and improve control information and assign speed,
To quickly and accurately control collecting and distributing type grid-connected photovoltaic system output power.Meanwhile the side of assigning of above-mentioned logical order
Formula, advantage are to ensure that rapidity, avoid the communication interference issues in high-power electric and electronic system, make the logical of control instruction
Letter reliability improves a grade.
It is as follows using collecting and distributing type grid-connected photovoltaic system operational process of the invention:
1, start concentrated gird-connected inverter
In the state that concentrated gird-connected inverter and MPPT header box are shut down, light that more MPPT header boxs are connected
The not boosted direct parallel connection of output voltage of volt component is transmitted to common DC bus, identifies the electricity by concentrated gird-connected inverter
After pressure is greater than collecting and distributing type grid-connected photovoltaic system starting voltage, determine that illumination condition can carry out inversion output at this time, open at this time
Dynamic concentrated gird-connected inverter exports DC bus-bar voltage given value in linear code area by voltage code module, then by public
Power grid takes energy, and common DC bus voltage is controlled in the voltage given value.
2, start MPPT header box
Voltage decoding module detection common DC bus voltage in MPPT header box prolongs within the scope of 95%-105%pu
MPPT module is enabled after Shi Zijian to be tracked, and photovoltaic module power is boosted, and be delivered to common DC bus.At this time
For stable DC busbar voltage, concentrated gird-connected inverter adjusted by control loop after from trend public electric wire net inversion, be transferred to inverse
Change state.
3, active power dispatch is run
Voltage code module in concentrated gird-connected inverter detects that MPPT header box has output power, has started normal
After work, common DC bus voltage is adjusted within the scope of 95%-105%pu according to electric power system dispatching instruction, makes collecting and distributing type
Grid-connected photovoltaic system output power is not more than the assigned limit value of electric system.Voltage decoding module in MPPT header box is certainly
Dynamic identification common DC bus voltage, limits the photovoltaic output power of the MPPT module of MPPT header box.
4, fault of converter
It breaks down if concentrated gird-connected inverter detects, voltage code module adjusts common DC bus voltage
To 93%pu hereinafter, there is no output powers for inverter until MPPT header box is all shut down；If concentrated gird-connected inverter loses
Control, then common DC bus voltage can be filled height by the energy of MPPT header box, the voltage decoding module detection in MPPT header box
Voltage is higher than autostop after 107%pu；If concentrated gird-connected inverter short circuit, common DC bus voltage can directly be drawn
Down to 93%pu hereinafter, the voltage decoding module in MPPT header box automatically stops the MPPT module of MPPT header box after detecting
Machine does not make failure propagation.
5, header box failure
The instruction issuing of concentrated gird-connected inverter is broadcast mode, if individual MPPT header box failures, other MPPT
Header box works normally, and other MPPT header boxs will share the output power of failure header box in the case where illumination abundance,
Collecting and distributing type grid-connected photovoltaic system gross output is set still to reach electric system limit value.
6, low voltage crossing
If concentrated gird-connected inverter detects low voltage crossing, voltage code module is in 106%-108%pu range
Common DC bus voltage is inside raised twice in succession, and the voltage decoding module in MPPT header box makes automatically after detecting the instruction
MPPT module suspend mode, the fast quick-recovery output power after common DC bus voltage is less than 105%.
7, inverter suspend mode
If concentrated gird-connected inverter detects collecting and distributing type, grid-connected photovoltaic system output power is too low, voltage code
Module reduces common DC bus twice in succession within the scope of 92%-94%, the voltage decoding module inspection in MPPT header box
So that MPPT module is entered dormant state after measuring, stop power output, if common DC bus voltage is extensive after delay a period of time
It is multiple then to start output to uniform enconding area, it is shut down after delay on the contrary.
8, system-down
If concentrated gird-connected inverter receives long-range halt instruction, voltage code module will be under common DC bus voltage
93%pu is adjusted to hereinafter, the voltage decoding module in MPPT header box automatically stops the MPPT module of MPPT header box after identifying
Work.
Technical solution proposed by the invention can be applied to other scheduling, controls with Common DC Profibus Control System
Information transmitting, the transmitted information in uniform enconding area can be set as the dispatch command of other consecutive variations, non-uniform encoding Qu Suochuan
Other logical control informations can be set as by passing information.
Detailed description of the invention
Fig. 1 is collecting and distributing type grid-connected photovoltaic system topological diagram；
Fig. 2 is multi-task scheduling protocol code subregion schematic diagram；
Fig. 3 is invertor operation control block diagram；
Fig. 4 is the whole closed-loop control block diagram of inverter and header box when linear code area is run；
Fig. 5 is header box control block diagram.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
The embodiment of the present invention is 1MW collecting and distributing type grid-connected photovoltaic system, and overall system capacity 1MW is by 1 rated power
The MPPT header box 101 that concentrated gird-connected inverter 102 and 20 rated power of 1MW is 50kW forms, common DC bus
103 voltage ratings are 850V, and matched photovoltaic module open-circuit voltage is about 750V.
As shown in figure 3, voltage code module 108 be connected to concentrated gird-connected inverter 102 and MPPT header box 101 it
Between, on the common DC bus of concentrated inverter side, one end connects DC bus, and the other end is separately connected more MPPT
Header box.
As shown in figure 5, concentrated gird-connected inverter 102 present instruction state of the voltage code module according to input, to inverse
Become the common DC bus voltage given value that device CPU output adjusts inverter, controls common DC bus voltage change, will instruct
It is conveyed to the DC bus that each MPPT header box voltage decoding module 115 is located at MPPT header box side in the form of a voltage
On, multiple voltage decoding modules are correspondingly connected with a voltage code module, identify concentration according to header box DC bus-bar voltage
The dispatch command that type gird-connected inverter is issued, MPPT header box are run according to this dispatch command, including header box start and stop, limit
Power, low voltage crossing, suspend mode etc..
Control method of the present invention is illustrated with embodiment below:
1, control target is determined
In this embodiment, determine that the control target of collecting and distributing type grid-connected photovoltaic system be the grid-connected hair of collecting and distributing type
Electric system gross output, the control target of concentrated gird-connected inverter are common DC bus voltage；Voltage code module
Controlling target is common DC bus voltage given value；The control target of MPPT header box be carry out photovoltaic module maximum power with
Track, and execute the instructions such as " limit power ", " starting ", " shutdown ", " low voltage crossing ", " system suspend mode "；Voltage decoding module
Control target is to provide instruction needed for MPPT header box according to common DC bus voltage value.
2, coding region is divided
According to afore-mentioned code region partitioning method, 807.5-892.5V is set as uniform enconding area 106, for transmitting 0-
100% active power of output limit value；765-807.5V and 892.5-935V are set as non-uniform encoding area 107, patrolled for transmitting
Collect instruction.
3, coding rule is designed
Table 2 show 103 voltage of 1MW collecting and distributing type grid-connected photovoltaic system common DC bus control coding schedule.
2 1MW collecting and distributing type grid-connected photovoltaic system common DC bus voltage of table controls coding schedule
Table 2 has made regulation to each instruction and common DC bus voltage operation mode.By 108 basis of voltage code module
The coding rule is scheduled common DC bus voltage, identifies common DC bus voltage by voltage decoding module 115, from
And scheduling information is conveyed to 101 Inner Control Loop of MPPT header box.
4, concentrated control method of grid-connected inverter is worked out
Fig. 3 show 102 control block diagram of concentrated inverter.Concentrated inverter 102 is in conventional DC voltage, exchange
Except current double closed-loop control loop, voltage code module 108 is added, realizes that output power closed loop and logical order are assigned and waits function
Energy.
5, the specific control method of MPPT header box is worked out
Fig. 5 show 101 control block diagram of MPPT header box, and MPPT header box is in conventional MPPT module 114 and photovoltaic group
Except part Voltage loop 113, the scheduling that voltage decoding module 115 is assigned coded by common DC bus voltage for identification is added and refers to
It enables.
1MW collecting and distributing type grid-connected photovoltaic system embodiment carrying out practically process is as follows:
1, start inverter
Voltage code mould under collecting and distributing type grid-connected photovoltaic system shutdown status, in concentrated gird-connected inverter 102
Block 108 detects 103 voltage of common DC bus and is higher than 300V and stablizes after five minutes, starts inverter and by common DC bus
103 voltages are controlled in 850V.
2, start header box
Voltage decoding module 115 in MPPT header box 101 detects 103 voltage of common DC bus in linear code area
In 106 ranges, starting MPPT header box boosting after the 3min self test failure that is delayed, and carry out MPPT tracking.Due to public at this time straight
Stream 103 voltage of bus is 850V, and 101 peak power output of MPPT header box is 25kW.
3, active power dispatch is run
Voltage code module 108 detects collecting and distributing type grid-connected photovoltaic system gross output greater than after 10kW, puts into defeated
Power closed-loop control out adjusts common DC bus voltage according to electric power system dispatching instruction in linear code area 106.20
115 automatic identification common DC bus of voltage decoding module, 103 voltage in MPPT header box 101 divides within the scope of 0-50kW
It Tiao Jie not output power.
4, fault of converter
If voltage code module 108 detects that inverter 102 breaks down, 103 voltage of common DC bus is adjusted
To 790.5V hereinafter, until detection collecting and distributing type grid-connected photovoltaic system gross output less than 0, shut down again by row；If inverter
102 is out of control, then the voltage decoding module 115 in header box 101 detects that 103 voltage of common DC bus is higher than 909.5V or low
After 790.5V, automatically shut down header box 101.
5,101 failure of header box
For example, each MPPT converges if it is that 400kW is instructed to inverter 102 that gross output limit value is assigned in electric system
The stream 101 current maximum power of connected photovoltaic module of case is 40kW.Then after the automatic adjustment of collecting and distributing type grid-connected photovoltaic system,
103 voltage of common DC bus is about 841.5V, and the sent out power of each MPPT header box 101 is about 20kW.When separate unit MPPT converges
Case 101 is automatically stopped operation after breaking down, after the automatic adjustment of collecting and distributing type grid-connected photovoltaic system, common DC bus
103 voltages are about 843.3V, remaining sent out power of 19 MPPT header boxs 101 is about 21.05kW.
6, low voltage crossing
If the voltage code module 108 in 1MW gird-connected inverter 102 detects that low voltage crossing occurs for power grid, immediately
By the control of 103 voltage of common DC bus to 901V, 918V, the voltage decoding module 115 in header box 101 are arrived in control after 20ms
Make 101 suspend mode of header box automatically after detecting the instruction, the fast quick-recovery output after 103 voltage of common DC bus is less than 892V
Power.
7, inverter suspend mode
If voltage code module 108 detects that collecting and distributing type grid-connected photovoltaic system output power, will be public lower than 3kW
103 voltage of DC bus is adjusted to 799V, is adjusted to 782V after 20ms.Voltage decoding module 115 makes to converge after detecting the information
Case 101 enters dormant state, stops power output, if 103 voltage of common DC bus is adjusted to by inverter 102 in 10min
The then quick start of uniform enconding area 106, on the contrary it is shut down after delay.After the gross output to be detected of voltage code module 115 is less than 0
Again shut down inverter 102.
8, system-down
If concentrated gird-connected inverter 102 receives collecting and distributing type grid-connected photovoltaic system halt instruction, voltage code mould
103 voltage of common DC bus is adjusted downward to 790.5 hereinafter, making header box automatically after the identification of voltage decoding module 115 by block 108
101 shut down.The gross output to be detected of voltage code module 115 less than 0 after make again inverter 102 shut down.
The present invention can solve in 1MW collecting and distributing type grid-connected photovoltaic system power dispatching not in time, system operation not
Reliable problem.
Claims (5)
1. a kind of collecting and distributing type grid-connected photovoltaic system Collaborative Control device, the collecting and distributing type grid-connected photovoltaic system is by list
Platform concentrated gird-connected inverter has the function of maximal power tracing (MPPT) header box composition with more, and separate unit concentrated is grid-connected inverse
Become device and more header box common DC bus, it is characterised in that: voltage code mould is added in separate unit concentrated gird-connected inverter
Block, the voltage code module are located on the common DC bus of separate unit concentrated gird-connected inverter side, and one end connects direct current
Bus, the other end are separately connected more MPPT header boxs；Voltage decoding module is added in each MPPT header box, and voltage decodes mould
Block is located on the DC bus of header box side, and multiple voltage decoding modules are correspondingly connected with a voltage code module；The electricity
It presses coding module according to the present instruction state of the concentrated gird-connected inverter of input, is exported to inverter CPU and adjust inverter
Common DC bus voltage given value, control common DC bus voltage change, and by adjust common DC bus voltage give
The instruction of definite value is conveyed to each MPPT header box in the form of a voltage；The voltage decoding module is according to header box direct current
Busbar voltage identifies the issued dispatch command of concentrated gird-connected inverter, and using this dispatch command as input, output control refers to
Order runs header box according to dispatch command.
2. a kind of control method to collecting and distributing type grid-connected photovoltaic system Collaborative Control device described in claim 1, special
Sign is: the control method the following steps are included:
(1) control target is determined
Firstly, determining that with the gross output of collecting and distributing type grid-connected photovoltaic system be control target, for this purpose, concentrated is grid-connected inverse
The control target for becoming device is common DC bus voltage；The control target of voltage code module is that common DC bus voltage is given
Value；The control target of voltage decoding module is to provide instruction, MPPT needed for MPPT header box according to common DC bus voltage value
The control target of header box is to carry out photovoltaic module maximal power tracing, and execute " limit power ", " starting ", " shutdown ", " low electricity
Press to wear more ", the instruction of " system suspend mode "；
(2) coding region of common DC bus voltage is divided
Secondly, being uniform enconding area and non-uniform encoding area by common DC bus voltage division；The uniform enconding position
In the voltage in ± 5% range of common DC bus voltage rating, operated normally for collecting and distributing type grid-connected photovoltaic system
Region；The non-uniform encoding area is within the scope of the 90%-95% range and 105%-110% of voltage rating, is that equipment is short
The permission voltage regime of Shi Yunhang；Uniform enconding area is for transmitting the instruction of photovoltaic output power clipping, by controlling public direct-current
The consecutive variations of busbar voltage transmit；Non-uniform encoding area is for transmitting " starting ", " shutdown ", " low voltage crossing ", " system
The logical action of suspend mode ", instruction transmitting form are the common DC bus voltage of short time phase step type variation；
(3) coding rule is designed, is realized by voltage code module and voltage decoding module, voltage code module passes through control direct current
Busbar voltage is encoded, voltage decoding module according to issuing header box action command the case where common DC bus voltage,
Realize decoding；
(4) according to the control to concentrated gird-connected inverter
It is " limitation active power output " that concentrated gird-connected inverter assigns received electric system through background monitoring, " long-range
Open/shut down " etc. instruction and the information such as concentrated gird-connected inverter local software and hardware self test failure, inverter gross output,
Summarize the voltage code module into concentrated gird-connected inverter, DC bus-bar voltage given value exported by voltage code module,
Again through conventional DC voltage, alternating current double-closed-loop control, grid-connected output is realized；
(5) to the control of MPPT header box
In collecting and distributing type grid-connected photovoltaic system operational process, first by voltage decoding module identification common DC bus electricity
Pressure instructs with power dispatching etc. to provide to open/shut down, executes phase while carrying out maximal power tracing by MPPT header box
The instruction answered, then controlled through voltage close loop, realize the operation of MPPT header box.
3. control method according to claim 2, it is characterised in that: in the step (4), when voltage code module is known
Other collecting and distributing type grid-connected photovoltaic system failure, low voltage crossing, start and stop logic state when, control public direct-current is female
Line voltage enters non-uniform encoding area, executes MPPT header box by the phase step type control to DC bus-bar voltage and accordingly refers to
Enable: control common DC bus voltage is higher than 107%pu or is lower than 93%pu, MPPT header box hard stop；It controls public straight
Stream busbar voltage rises twice in succession within the scope of 106%-108%pu, then MPPT header box enters low voltage crossing state, stands
Stop power output, fast quick-recovery is to output power before after the recovery of common DC bus voltage；Concentrated is grid-connected inverse
Become device control common DC bus voltage to decline twice in succession within the scope of 92%-94%pu, MPPT header box enters suspend mode shape
State is shut down if collecting and distributing type grid-connected photovoltaic system does not start still after one section of delay；When concentrated gird-connected inverter control
After common DC bus voltage processed enters the uniform enconding area of 95%-105%pu, start command is first carried out in MPPT header box,
Corresponding output power adjusting movement is executed again.
4. control method according to claim 2, it is characterised in that: when the collecting and distributing type grid-connected photovoltaic system just
Often when operation, the DC bus-bar voltage given value of voltage code module output is in uniform enconding area, and assigned information is linear
The control information of variation；The power that the concentrated gird-connected inverter of voltage code module identification at this time is conveyed to power grid, judges to export
Whether power is excessively high, if output power is excessively high, controls the reduction of common DC bus voltage, MPPT header box is decoded by voltage
After module identifies that common DC bus voltage reduces, output power is accordingly lowered.
5. control method according to claim 2, it is characterised in that: the collecting and distributing type photovoltaic under cooperative control method control
Grid-connected system operational process is as follows:
(1) start concentrated gird-connected inverter inverter
In the state that concentrated gird-connected inverter and MPPT header box are shut down, photovoltaic group that more MPPT header boxs are connected
The not boosted direct parallel connection of the output voltage of part is transmitted to common DC bus, identifies that the voltage is big by concentrated gird-connected inverter
After collecting and distributing type grid-connected photovoltaic system starts voltage, determine that illumination condition is able to carry out inversion output at this time, starts at this time
Concentrated gird-connected inverter exports concentrated gird-connected inverter value in linear code area by voltage code module, then by common electrical
Net takes energy, and common DC bus voltage is controlled in the concentrated gird-connected inverter value；
(2) start MPPT header box
Voltage decoding module detection common DC bus voltage in MPPT header box is within the scope of 95%-105%pu, and delay is certainly
MPPT module is enabled after inspection to be tracked, and photovoltaic module power is boosted, and be delivered to common DC bus；It is straight to stablize at this time
Flow busbar voltage, concentrated gird-connected inverter adjusted by control loop after from trend public electric wire net inversion, be transferred to inverter mode；
(3) active power dispatch is run
Voltage code module in concentrated gird-connected inverter detects that MPPT header box has output power, has started to work normally
Afterwards, common DC bus voltage is adjusted within the scope of 95%-105%pu according to electric power system dispatching instruction, makes collecting and distributing type photovoltaic
Grid-connected system output power is not more than the assigned limit value of electric system；Voltage decoding module in MPPT header box is known automatically
Other common DC bus voltage limits the photovoltaic output power of the MPPT module of MPPT header box；
(4) fault of converter
It breaks down if concentrated gird-connected inverter detects, common DC bus voltage is adjusted to by voltage code module
93%pu is hereinafter, until MPPT header box is all shut down, and there is no output powers for inverter；If concentrated gird-connected inverter loses
Control, then common DC bus voltage can be filled height by the energy of MPPT header box, the voltage decoding module detection in MPPT header box
Voltage is higher than autostop after 107%pu；If concentrated gird-connected inverter short circuit, common DC bus voltage can directly be drawn
Down to 93%pu hereinafter, the voltage decoding module in MPPT header box automatically stops the MPPT module of MPPT header box after detecting
Machine does not make failure propagation；
(5) MPPT header box failure
If individual MPPT header box failures, other MPPT header boxs work normally, and other MPPT in the case where illumination abundance
Header box will share the output power of failure header box, and collecting and distributing type grid-connected photovoltaic system gross output is made still to reach electric power
System limit value；
(6) low voltage crossing
If concentrated gird-connected inverter detects low voltage crossing, voltage code module connects within the scope of 106%-108%pu
Continuous to raise common DC bus voltage twice, the voltage decoding module in MPPT header box makes MPPT after detecting the instruction automatically
The MPPT module suspend mode of header box, the fast quick-recovery output power after common DC bus voltage is less than 105%；
(7) inverter suspend mode
If concentrated gird-connected inverter detects collecting and distributing type, grid-connected photovoltaic system output power is too low, voltage code module
Common DC bus is reduced twice in succession within the scope of 92%-94%, the voltage decoding module in MPPT header box detects
After so that MPPT module is entered dormant state, stop power output；If delay a period of time after common DC bus voltage restore to
Uniform enconding area then starts output, otherwise shuts down after delay；
(8) collecting and distributing type grid-connected photovoltaic system is shut down
If concentrated gird-connected inverter receives long-range halt instruction, common DC bus voltage is adjusted downward to by voltage code module
93%pu is hereinafter, the voltage decoding module in MPPT header box makes the MPPT module of MPPT header box stop work automatically after identifying
Make.
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| CN107623488B (en) * | 2017-08-29 | 2019-08-23 | 深圳市禾望电气股份有限公司 | Limit Poewr control method, collecting and distributing type photovoltaic combiner box and storage medium |
| CN107994614A (en) * | 2017-12-22 | 2018-05-04 | 上能电气股份有限公司 | A kind of collecting and distributing type photovoltaic inverting system cooperative control method |
| CN110380397B (en) * | 2019-06-18 | 2022-12-23 | 天津大学 | Control framework suitable for medium-low voltage direct current power distribution and utilization system |
| CN112242712B (en) * | 2019-07-17 | 2022-08-19 | 株洲中车时代电气股份有限公司 | Power control method for two-stage photovoltaic inverter system |
| CN112817341B (en) * | 2021-02-03 | 2023-09-29 | 阳光电源股份有限公司 | Photovoltaic tracking support control method, photovoltaic tracking controller and photovoltaic tracking system |
| CN115085246A (en) | 2021-03-12 | 2022-09-20 | 华为数字能源技术有限公司 | Power supply system and control method of power supply system |
| CN113746170B (en) * | 2021-09-03 | 2024-02-09 | 阳光电源（上海）有限公司 | Energy storage system and off-grid overload protection method thereof |
| CN114006404B (en) * | 2021-11-12 | 2024-04-26 | 广东电网有限责任公司 | Operation control method and device for photovoltaic power electronic transformer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425689A (en) * | 2008-11-07 | 2009-05-06 | 陈思南 | Intelligent remote electricity control system |
| CN103730911A (en) * | 2013-12-25 | 2014-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Grid connection method of photovoltaic grid connection inverter and photovoltaic grid connection power generating system |
| CN103825299A (en) * | 2014-02-28 | 2014-05-28 | 深圳市长昊机电有限公司 | Grid-connected photovoltaic power generation system and control method thereof |
| CN105610231A (en) * | 2014-11-11 | 2016-05-25 | 珠海兴业绿色建筑科技有限公司 | Implementation method of direct-current power system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090000654A1 (en) * | 2007-05-17 | 2009-01-01 | Larankelo, Inc. | Distributed inverter and intelligent gateway |
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- 2016-11-25 CN CN201611062733.3A patent/CN106410854B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425689A (en) * | 2008-11-07 | 2009-05-06 | 陈思南 | Intelligent remote electricity control system |
| CN103730911A (en) * | 2013-12-25 | 2014-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Grid connection method of photovoltaic grid connection inverter and photovoltaic grid connection power generating system |
| CN103825299A (en) * | 2014-02-28 | 2014-05-28 | 深圳市长昊机电有限公司 | Grid-connected photovoltaic power generation system and control method thereof |
| CN105610231A (en) * | 2014-11-11 | 2016-05-25 | 珠海兴业绿色建筑科技有限公司 | Implementation method of direct-current power system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12308791B2 (en) | 2020-12-22 | 2025-05-20 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic power generation system, power control method, and combiner box |
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