CN109888827A - Photovoltaic combining inverter power limitation method, device, controller and inverter - Google Patents
Photovoltaic combining inverter power limitation method, device, controller and inverter Download PDFInfo
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- CN109888827A CN109888827A CN201910188257.7A CN201910188257A CN109888827A CN 109888827 A CN109888827 A CN 109888827A CN 201910188257 A CN201910188257 A CN 201910188257A CN 109888827 A CN109888827 A CN 109888827A
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- 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
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- 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
Abstract
The present invention provides photovoltaic combining inverter power limitation method, device, controller and inverters, when power limit is larger, control the output power of photovoltaic combining inverter to make the output power reach power limit requirement；When power limit is smaller, the input power of photovoltaic combining inverter is controlled to control its output power.When the output power of photovoltaic combining inverter is smaller, voltage, the current characteristics of DC side are stablized, acquisition and control error are smaller, therefore when power limit is smaller, can be improved the control precision of power limit by the way of the input power of control photovoltaic combining inverter.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation more particularly to photovoltaic combining inverter power limitation method, device, controls
Device and inverter processed.
Background technique
The direct current that photovoltaic solar panel generates can be converted to frequency and phase with alternating current by photovoltaic combining inverter
Identical alternating current is simultaneously sent into power grid, is one of the important equipment connected between photovoltaic generating system and power grid.
The management and running of photovoltaic combining inverter refer to that inverter receives the power limit of power grid transmission in being incorporated into the power networks
Instruction, and the output power for adjusting inverter is instructed according to the power limit, to meet power grid to the output power of inverter
Demand.In terms of the output result of inverter, management and running, which can be divided into, power mode and zero energy mode.There is power mode
The demands such as the consumption according to power grid limit the Partial Power output of inverter.Zero energy mode require inverter output power be
Zero, alternatively, some applications, the electric energy that inverter issues needs the load of inverter local to dissolve, and does not allow to be delivered to electricity
Net, i.e. zero energy mode are not allow for electrical energy transportation to power grid.
Traditional power limitation method meets outer usually by control inverter ac side power to limit power output
Ministry dispatching instruction.But when power limit smaller (that is, inverter is made to export lesser power), due to by inverter
The influence that output current characteristic is deteriorated, the output power of inverter can have error, be difficult to reach required limitation precision.For
The biggish photovoltaic plant of capacity, the accumulative error of more inverters can be bigger.
In addition, inverter needs to disconnect and the connection of power grid under zero energy mode, and after zero energy mode release, inversion
Think highly of and newly establish connection with power grid, on the one hand, continually disconnects, connection sets the switch directly affected between inverter and power grid
Standby service life；On the other hand, inverter is established during connection with power grid again there are reconnection delay, and inverter cannot
The power output after zero energy releases is timely responded to, to influence generating efficiency.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of photovoltaic combining inverter power limitation methods, device, control
Device and inverter, to solve when power limit is smaller, there are errors for traditional power limitation method greatly, limitation precision is low
Technical problem, specific technical solution are as follows:
In a first aspect, the present invention provides a kind of photovoltaic combining inverter power limitation methods, comprising:
Power limit dispatch command is received, and target output value is calculated according to the power limit dispatch command；
Compare the target output value and output power threshold value；
If the target output value is greater than or equal to the output power threshold value, the photovoltaic grid-connected inversion is controlled
The output power of device, so that the output power reaches the target output value；
If the target output value is less than the output power threshold value, the defeated of the photovoltaic combining inverter is controlled
Enter power, so that the output power reaches the target output value.
Optionally, the output power of the control photovoltaic combining inverter, so that the output power reaches described
Target output value, comprising:
According to the target output value, and the alternating voltage of the photovoltaic combining inverter obtained, it calculates
To target current value；
The output electric current for controlling the photovoltaic combining inverter reaches the target current value, so that the output power reaches
To the target output value.
Optionally, if the target output value is less than the output power threshold value, the photovoltaic is controlled simultaneously
The input power of net inverter, so that the output power reaches the target output value, comprising:
If the target output is greater than zero and is less than the output power threshold value, by the target output value
Be converted to the target input power value of the photovoltaic combining inverter；
Obtain the input power of the photovoltaic combining inverter；
The DC voltage of the photovoltaic combining inverter is adjusted, so that the input power of the photovoltaic combining inverter reaches
The target input power value.
Optionally, the DC voltage of the adjustment photovoltaic combining inverter, so that the photovoltaic combining inverter
Input power reaches the target input power value, comprising:
According to first voltage adjusting step, repetition adjusts the current DC voltage of the photovoltaic combining inverter, Zhi Daoyi
It is reached according to the input power that the DC current of DC voltage adjusted and the collected photovoltaic combining inverter calculates
To the target input power value, wherein the first voltage adjusting step is greater than zero.
Optionally, the target output value is equal to zero；
If the target output value is less than the output power threshold value, the photovoltaic combining inverter is controlled
Input power so that the output power of the photovoltaic combining inverter reaches the target output value, comprising:
If the target output is equal to zero, according to second voltage adjusting step, repetition adjusts described grid-connected
The current DC voltage of inverter, until open-circuit voltage of the DC voltage adjusted greater than the photovoltaic combining inverter and in advance
If the sum of voltage value, the preset voltage value is greater than the second voltage adjusting step, and the second voltage adjusting step is greater than
Zero.
Optionally, power limit dispatch command is being received, and it is defeated according to the power limit dispatch command target to be calculated
Out after performance number, the method also includes:
Obtain the present output power of the photovoltaic combining inverter；
Compare the present output power and the target output value；
If the present output power is less than the target output value, terminate current power limitation process；
If the present output power is greater than or equal to the target output value, the relatively target output is executed
The step of performance number and output power threshold value.
Second aspect, the present invention also provides a kind of photovoltaic combining inverter power limitation devices, comprising:
Dispatch command receiving module, for receiving power limit dispatch command, and according to the power limit dispatch command meter
Calculation obtains target output value；
Comparison module, for the target output value and output power threshold value；
First control module is controlled if being greater than or equal to the output power threshold value for the target output value
The output power of the photovoltaic combining inverter is made, so as to reach the target defeated for the output power of the photovoltaic combining inverter
Performance number out；
Second control module, if for the target output value be less than the output power threshold value, control described in
The input power of photovoltaic combining inverter, so that the output power of the photovoltaic combining inverter reaches the target output
Value.
Optionally, first control module, comprising:
Target current acquisition submodule is used for according to the target output value, and is obtained described grid-connected
The alternating voltage of inverter, is calculated target current value；
Current control submodule is exported, the output electric current for controlling the photovoltaic combining inverter reaches the target electricity
Flow valuve, so that the output power of the photovoltaic combining inverter reaches the target output value.
The third aspect, the present invention also provides a kind of controllers of photovoltaic combining inverter, comprising: input interface, processing
Unit, output interface；
The input interface for receiving power limit dispatch command, and is supplied to the processing unit；
The processing unit, for target output value to be calculated according to the power limit dispatch command；Compare
The target output value and output power threshold value, if the target output value is greater than or equal to the output power threshold
Value, then generate the first control signal for controlling the output power of the photovoltaic combining inverter, if the target output value
Less than the output power threshold value, then the second control signal for controlling the input power of the photovoltaic combining inverter is generated；
The output interface, for when receiving the first control signal that the processing unit generates, output should
First control signal, so that the output power of the photovoltaic combining inverter reaches the target output value；When receiving
When the second control signal that the processing unit generates, the second control signal is exported, so that the photovoltaic grid-connected inversion
The output power of device reaches the target output value.
Fourth aspect, the present invention also provides a kind of photovoltaic combining inverters, comprising: controller and inverter module；
The controller is calculated for receiving power limit dispatch command, and according to the power limit dispatch command
Target output value；Compare the target output value and output power threshold value；If the target output value is greater than
Or be equal to the output power threshold value, then the output power of the inverter module is controlled, so that the output work of the inverter module
Rate reaches the target output value；If the target output value be less than the output power threshold value, control described in
The input power of inverter module, so that the output power of the inverter module reaches the target output value.
Photovoltaic combining inverter power limitation method provided by the invention is provided when photovoltaic combining inverter receives power grid
Power limit dispatch command after, target output value is calculated according to the power limit dispatch command, if the target
Output power value is greater than output power threshold value, then controls the output power of photovoltaic combining inverter to reach target output
Value.If the target output value is less than or equal to output power threshold value, the input power of photovoltaic combining inverter is controlled
So that the output power of photovoltaic combining inverter reaches target output value.This method passes through when power limit is smaller
The input power of photovoltaic combining inverter is controlled to control the output power of photovoltaic combining inverter.When photovoltaic combining inverter
When output power is smaller, voltage, the current characteristics of DC side are stablized, and acquisition and control error are smaller, therefore in power limit
When being worth smaller, the control precision of power limit can be improved by the way of controlling input power.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the power control system of photovoltaic combining inverter provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of photovoltaic combining inverter power limitation method provided in an embodiment of the present invention；
Current control schematic diagram when Fig. 3 is a kind of photovoltaic combining inverter management and running provided in an embodiment of the present invention；
Fig. 4 is a kind of flow chart of input power control process provided in an embodiment of the present invention；
Fig. 5 is the P-V characteristic curve schematic diagram of photovoltaic cell；
Fig. 6 is provided in an embodiment of the present invention in the case where non-zero power limits scene, when photovoltaic combining inverter management and running
Voltage control principle drawing；
Fig. 7 is provided in an embodiment of the present invention in the case where zero energy limits scene, electricity when photovoltaic combining inverter management and running
Press control principle drawing；
Fig. 8 is the flow chart of another photovoltaic combining inverter power limitation method provided in an embodiment of the present invention；
Fig. 9 is a kind of structural schematic diagram of photovoltaic combining inverter power limitation device provided in an embodiment of the present invention；
Figure 10 is a kind of structural schematic diagram of first control module provided in an embodiment of the present invention；
Figure 11 is a kind of structural schematic diagram of second control module provided in an embodiment of the present invention；
Figure 12 is a kind of structural schematic diagram of controller provided in an embodiment of the present invention；
Figure 13 is a kind of structural schematic diagram of photovoltaic combining inverter provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to Figure 1, a kind of power control system of photovoltaic combining inverter provided in an embodiment of the present invention is shown
Structural schematic diagram, the control system include two power control paths, respectively input power control path and output power control
Path processed.
Input power control path includes: DC voltage sampling unit 100, DC current sampling unit 200, dc power
Computing unit 300, direct-current voltage control unit 400.The path adjusts by adjusting the DC voltage of photovoltaic combining inverter
Its input power, and then adjust its output power.
Wherein, DC voltage sampling unit 100 acquires the voltage signal of inverter direct-flow side, for example, voltage can be used
Sensor.DC current sampling unit 200 acquires the current signal of photovoltaic combining inverter DC side, for example, can be using electricity
Flow sensor.Dc power calculates the d. c. voltage signal that unit 300 is used to acquire according to DC voltage sampling unit 100, with
And the DC current signal that DC current sampling unit 200 acquires, the input power of inverter is calculated.DC voltage control
Unit 400 is used to control the input voltage of inverter and then controls the output power of inverter so that the output power reaches target
Output power value.
Output power path includes: alternating voltage sampling unit 500, alternating current sampling unit 600, AC power
Computing unit 700 and AC current control unit 800.The path adjusts by adjusting the alternating current of photovoltaic combining inverter
Its output power.
Wherein, alternating voltage sampling unit 500 acquires the voltage signal of inverter ac side, for example, voltage can be used
Sensor.Alternating current sampling unit 600 acquires the current signal of inverter ac side, for example, current transformer can be used.
AC power computing unit 700 is used to adopt according to the ac voltage signal and alternating current of the acquisition of alternating voltage sampling unit
The alternating current of sample unit acquisition, is calculated the output power of inverter.AC current control unit 800 is for controlling inversion
The output electric current of device controls the output power of inverter so that the output power reaches target output value in turn.
Power dispatching unit 1200 is used to send power limit dispatch command to the control unit 900 of inverter.Control is single
Member 900 according to power limit dispatch command obtains target output value and according to target output value and output power threshold value
Determine which control path selected.
Specifically, selecting input power control path when target output value is less than output power threshold value；Work as target
Output power value selects output power path when being greater than or equal to output power threshold value.
The control signal of two control paths output is supplied to PWM control unit 1000, and PWM control unit 1000 is according to connecing
The control signal output phase received answers the pwm signal of duty ratio to be supplied to inversion unit 1100, so that inversion unit 1100 is defeated
Power reaches target output value out.
In the power control system of photovoltaic combining inverter shown in Fig. 1, it is voltage-controlled that dc power calculates unit, direct current
Unit, AC power computing unit, AC current control unit and PWM control unit processed can integrate in control unit, or
Person can be the equipment independently of control unit；DC voltage sampling unit, DC current sampling unit, alternating voltage sampling
Unit and alternating current sampling unit can integrate in inversion unit, adopt alternatively, can be independently of the external of inversion unit
Sample equipment.
Fig. 2 is referred to, a kind of stream of photovoltaic combining inverter power limitation method provided in an embodiment of the present invention is shown
Cheng Tu, this method are applied in control system shown in FIG. 1.As shown in Fig. 2, method includes the following steps:
S110 receives power limit dispatch command, and target output work is calculated according to the power limit dispatch command
Rate value.
Photovoltaic combining inverter receives the power limit dispatch command that power dispatching unit is sent, according to the power limit tune
It is that grid requirements photovoltaic combining inverter is final that target output value Pac_target, Pac_target, which is calculated, in degree instruction
The performance number of output.
For photovoltaic combining inverter when to power grid inputing power, power grid is according to digestion capability in real time to photovoltaic combining inverter
Power limit dispatch command is sent, the usual power limit dispatch command is the nominal peak power output of photovoltaic combining inverter
Percentage be calculated according to the power limit percentage in nominal peak power output × power limit dispatch command
Pac_target.For example, the nominal peak power output of photovoltaic combining inverter is 100kW, if in power limit dispatch command
Power limit percentage be 1%, then Pac_target=100kW × 1%=1kW.
S120 compares target output value and output power threshold value；If target output value is greater than or equal to defeated
Power threshold out then executes S130；If target output value is less than output power threshold value, S140 is executed.
Output power threshold value P_th is the judgement benchmark for selecting input power restriction strategy or output power limit strategy,
Usual P_th chooses the numerical value of photovoltaic combining inverter low power period traffic coverage, for example, photovoltaic combining inverter 5%~
10%.
S130 controls the output power of photovoltaic combining inverter, so that the output power of photovoltaic combining inverter reaches mesh
Mark output power value.
If Pac_target >=P_th, output power limit strategy is selected.
In one possible implementation, the concrete restriction process of output power limit strategy is: exporting according to target
Performance number Pac_target, and obtain photovoltaic combining inverter alternating voltage Vac, target current value Iac_ is calculated
ref；Then, the output electric current Iac for controlling photovoltaic combining inverter reaches Iac_ref, so that the output of photovoltaic combining inverter
Power P ac reaches target output value.
Fig. 3 is referred to, current control schematic diagram when showing photovoltaic combining inverter management and running, as shown in figure 3, utilizing
Iac_ref is calculated in Pac_target and Vac, and then, for alternating-current controller using Iac_ref as reference value, generation makes photovoltaic simultaneously
The Iac of net inverter reaches the control signal of Iac_ref and is supplied to PWM controller, and PWM controller is defeated according to the control signal
Corresponding pwm signal out finally makes the output electric current Iac=Iac_ref of photovoltaic combining inverter.Wherein, Iac passes through alternating current
Stream sampling unit collects；Vac is collected by alternating voltage sampling unit.
S140 controls the input power of photovoltaic combining inverter, so that the output power of photovoltaic combining inverter reaches mesh
Mark output power value.
If Pac_target < P_th, selects input power restriction strategy.
In a kind of application scenarios of the present invention, Pac_target > 0, i.e. power limit dispatch command are that non-acyclic homologically trioial degree refers to
It enables, under such application scenarios, as shown in figure 4, the control process of input power is as follows:
Target output value is converted to the target input power value of photovoltaic combining inverter by S141.
There are certain power losses for photovoltaic combining inverter itself, therefore, input power=output power+own power
Loss.
According to the relationship between the input power and output power it is found that target input power value Pdc_target=Pac_
Target+P_loss, P_loss are that the own power of photovoltaic combining inverter is lost, which can pass through photovoltaic combining inverter
Nameplate parameter be calculated.
S142 obtains the input power of photovoltaic combining inverter.
DC voltage sampling unit acquires the DC voltage Vdc of photovoltaic combining inverter, and DC current sampling unit obtains
The DC current Idc of photovoltaic combining inverter；Dc power calculates unit and photovoltaic grid-connected inversion is calculated according to Vdc and Idc
The input power Pdc of device.
S143 adjusts the DC voltage of photovoltaic combining inverter, so that the input power of photovoltaic combining inverter reaches mesh
Mark input power value.
The DC voltage Vdc that photovoltaic combining inverter is adjusted by direct-current voltage control unit, so that Pdc is moved closer to
Pdc_target。
In one possible implementation of the present invention, the adjustment process of S143 is as follows:
According to first voltage adjusting step △ V1, the current DC voltage Vdc for adjusting photovoltaic combining inverter is repeated, until
The input power Pdc that DC current Idc according to DC voltage adjusted and photovoltaic combining inverter is calculated reaches mesh
Mark input power value Pdc_target, wherein the first voltage adjusting step is greater than zero.
The P-V characteristic curve of photovoltaic cell shown in Figure 5, abscissa are voltage, and ordinate is power, curve table
The power of photovoltaic cell has been levied with the variation characteristic of voltage.Photovoltaic cell is connect with photovoltaic combining inverter, therefore, grid-connected
The input power and input voltage of inverter also comply with the characteristic of the curve.
P-V characteristic curve according to figure 5 adjusts DC voltage Vdc=Vdc_ref ± △ of photovoltaic combining inverter
V1, and calculate to obtain input power Pdc according to DC voltage adjusted and current DC current；Gradually adjustment Pdc is so that Pdc
Constantly close to Pdc_target, until Pdc=Pdc_target, alternatively, the absolute difference between Pdc and Pdc_target is small
In preset value.
Wherein, the value of Vdc_ref is the current DC voltage Vdc of photovoltaic combining inverter, that is, every time when adjustment, all
It is by DC voltage Vdc adjustment ± △ V1.Wherein ,-△ V1 indicates that Vdc reduces △ V1 on the basis of current value；+ △ V1 is indicated
Vdc increases △ V1 on the basis of current value.
As shown in fig. 6, voltage control principle drawing, voltage controller are continuous when showing photovoltaic combining inverter management and running
Ground adjusts DC voltage according to Vdc_ref=Vdc ± △ V1, and generates control signal and be transmitted to PWM controller；PWM controller
Corresponding pwm signal is generated according to the control signal received, and is transmitted to inversion unit, so that the Pdc of inversion unit reaches
Pdc_target。
Wherein, the first adjustment step-length △ V1 can be set according to the open-circuit voltage Voc of photovoltaic cell, for example, Voc is 500V
When~1000V or 500V~1500V, corresponding Voc is 1~5V.The first adjustment step-length is bigger, reaches the tune of target input power
It is fast to have suffered Cheng Yue, but there can be power swing；The first adjustment step-length is smaller, and the adjustment process for reaching target input power is got over
Slowly, but power is more stable.
In a preferred embodiment of the invention, △ V1 can be set as to a biggish numerical value in the initial stage,
For example, 5V or 4V etc., when input power reaches some threshold value, △ V1 is set as a lesser numerical value, for example, 1V or 2V
Deng.
In another application scenarios of the invention, Pac_target=0, i.e. power limit dispatch command are that acyclic homologically trioial degree refers to
Enable, under such application scenarios, S140's the specific implementation process is as follows:
According to second voltage adjusting step △ V2, the current DC voltage Vdc for adjusting photovoltaic combining inverter is repeated, even
Vdc=Vdc+ △ V2, until Vdc adjusted meets Vdc > Voc+ △ V3, wherein △ V3 is a preset voltage value, and △ V3
> △ V2.
As shown in figure 5, parabolic characteristic is presented in the P-V characteristic curve of photovoltaic cell, moreover, when voltage is greater than open-circuit voltage
When Voc, the power very little of photovoltaic cell is essentially 0；According to this characteristic, by the input voltage adjustment of photovoltaic cell to more than
When Voc, corresponding power very little can only maintain the own power of photovoltaic combining inverter to be lost, at this point, photovoltaic close to 0
Gird-connected inverter is generated without output power, to realize that zero energy limits.
As shown in fig. 7, voltage control principle drawing, voltage controller are continuous when showing photovoltaic combining inverter management and running
Ground adjusts DC voltage Vdc according to Vdc_ref=Vdc ± △ V1, and generates control signal and be transmitted to PWM controller；PWM control
Device generates corresponding pwm signal according to the control signal received, and is transmitted to inversion unit, so that the Vdc of inversion unit is full
Sufficient Vdc_ref > Voc+ △ V3.
According to above-mentioned process it is found that entire zero energy limit procedure is realized by adjusting the input voltage of inverter, and
The connection being not turned off between photovoltaic combining inverter and power grid, it is therefore, real in the case where photovoltaic combining inverter not off-grid
Existing output power is zero, thus the switching device service life connecting in raising system with power grid.Moreover, avoiding photovoltaic grid-connected inversion
The problem of device off-grid and again grid-connected existing reconnection delay, occurs.
Wherein, the method for determination phase of the method for determination of second voltage adjusting step △ V2 and first voltage adjusting step △ V1
Together, details are not described herein again, and △ V2 and △ V1 can be equal, can also be unequal.
Photovoltaic combining inverter power limitation method provided by the invention is provided when photovoltaic combining inverter receives power grid
Power limit dispatch command after, target output value is calculated according to the power limit dispatch command, if the target
Output power value is greater than output power threshold value, then controls the output power of photovoltaic combining inverter to reach target output
Value.If the target output value is less than or equal to output power threshold value, the input power of photovoltaic combining inverter is controlled
So that the output power of photovoltaic combining inverter reaches target output value.This method passes through when power limit is smaller
The input power of photovoltaic combining inverter is limited to control the output power of photovoltaic combining inverter.When photovoltaic combining inverter
When output power is smaller, voltage, the current characteristics of DC side are stablized, and acquisition and control error are smaller, therefore in power limit
When smaller, the control precision of power limit can be improved by the way of controlling input power.
Fig. 8 is referred to, another photovoltaic combining inverter power limitation method provided in an embodiment of the present invention is shown
Flow chart, further comprising the steps of on the basis of this method embodiment shown in Fig. 2:
S210 obtains the present output power of photovoltaic combining inverter.
The alternating voltage Vac that photovoltaic combining inverter is obtained by alternating voltage sampling unit, is sampled by alternating current
The alternating current Iac of unit acquisition photovoltaic combining inverter.Then, it is calculated by AC power computing unit according to Vac and Iac
To present output power Pac.
S220 compares present output power and target output value；If it is defeated that present output power is less than or equal to target
Performance number out then terminates current power limitation process；Otherwise, S120 is executed.
If Pac≤Pac_target, show that the power that photovoltaic combining inverter currently exports has met power grid limitation
It is required that therefore, there is no need to the output power for further limiting photovoltaic combining inverter, at this point, exiting power limit process.
If Pac > Pac_target, show that the power that photovoltaic combining inverter currently exports is greater than what power grid to be limited
Output power, therefore, it is necessary to further output it power limit by above-mentioned photovoltaic combining inverter power limitation method
To target output.
In addition, exiting power limit process after receiving power limit recovery instruction, power limit is restored instruction and is used for
Instruction photovoltaic combining inverter no longer carries out output power limit.
Photovoltaic combining inverter power limitation method provided in this embodiment is detecting present output power less than target
When output power, power limit process is automatically exited from.After exiting power limit process, photovoltaic combining inverter can be attempted to be turned up defeated
Power out makes the defeated of photovoltaic combining inverter in the enough situations of output power of photovoltaic cell and photovoltaic combining inverter
Power reaches target output as much as possible out, to meet the needs of grid side is to electric energy.
On the other hand, photovoltaic combining inverter power limitation method embodiment is corresponded to, the present invention also provides photovoltaics simultaneously
Net inverter power limits device embodiment.
Fig. 9 is referred to, a kind of knot of photovoltaic combining inverter power limitation device provided in an embodiment of the present invention is shown
Structure schematic diagram, the device include dispatch command receiving module 110, comparison module 120, the first control module 130 and the second control
Module 140.
Dispatch command receiving module 110, for receiving power limit dispatch command, and according to the power limit dispatch command
Target output value is calculated.
Comparison module 120, for comparing target output value and output power threshold value.
First control module 130 controls photovoltaic if being greater than or equal to output power threshold value for target output value
The output power of gird-connected inverter, so that the output power of photovoltaic combining inverter reaches target output value.
First control module 130 passes through control AC current control output power；In one embodiment of the invention, such as
Shown in Figure 10, the first control module 130 includes: target current acquisition submodule 131 and output current control submodule 132.
Target current acquisition submodule 131, for according to target output value, and the photovoltaic combining inverter of acquisition
Alternating voltage, target current value is calculated.
Current control submodule 132 is exported, the output electric current for controlling photovoltaic combining inverter reaches target current value,
So that the output power of photovoltaic combining inverter reaches target output value.
Second control module 140 controls grid-connected inverse if being less than output power threshold value for target output value
The input power for becoming device, so that the output power of photovoltaic combining inverter reaches target output value.
In one embodiment of the invention, target output value is greater than zero but is less than output power threshold value, such
Under application scenarios, as shown in figure 11, the second control module 140 may include that target power transform subblock 141, input power obtain
Take submodule 142 and DC voltage control submodule 143.
Target power transform subblock 141, for target output value to be converted to the photovoltaic combining inverter
Target input power value.
Input power acquisition submodule 142, for obtaining the input power of photovoltaic combining inverter.
DC voltage control submodule 143, for adjusting the DC voltage of photovoltaic combining inverter, so that grid-connected inverse
The input power for becoming device reaches the target input power value.
The function of DC current control submodule 143 herein is identical as the function of direct-current voltage control unit in Fig. 1.Tool
Body, which is specifically used for according to first voltage adjusting step, and repetition adjusts grid-connected inverse
The current DC voltage for becoming device, until the DC current according to DC voltage adjusted and collected photovoltaic combining inverter
The input power being calculated reaches target input power value.Wherein, first voltage adjusting step is greater than zero.
In another application scenarios, target output is equal to zero, and the second control module 140 is specifically used for: according to the
Two voltage adjusting steps repeat the current DC voltage for adjusting photovoltaic combining inverter, until DC voltage adjusted is greater than
The sum of open-circuit voltage and preset voltage value of photovoltaic combining inverter, preset voltage value are greater than second voltage adjusting step, wherein
Second voltage adjusting step is greater than zero.
In addition, target output is calculated receiving power limit dispatch command, and according to the power limit dispatch command
After performance number, compare present output power and target output value, if present output power is less than target output value,
Then terminate current power limitation process；If present output power is greater than or equal to target output value, comparison module is triggered
Compare target output value and output power threshold value.
Photovoltaic combining inverter power limitation device provided by the invention, when power limit is larger, control photovoltaic is simultaneously
The output power of net inverter is to make the output power reach power limit requirement；When power limit is smaller, pass through control
The input power of photovoltaic combining inverter processed controls its output power.When the output power of photovoltaic combining inverter is smaller,
Voltage, the current characteristics of DC side are stablized, and acquisition and control error are smaller, therefore when power limit is smaller, using control
The mode of input power can be improved the control precision of power limit.
Another aspect, the present invention also provides the controllers of photovoltaic combining inverter, and referring to Figure 12, which includes defeated
Incoming interface 210, processing unit 220, output interface 230.
The input interface 210 for receiving power limit dispatch command, and is supplied to the processing unit 220.
The processing unit 220, for target output value to be calculated according to power limit dispatch command；Compare mesh
Output power value and output power threshold value are marked, if target output value is greater than or equal to output power threshold value, generates control
The first control signal of the output power of photovoltaic combining inverter；If target output value is less than the output power threshold value,
Then generate the second control signal of the input power of control photovoltaic combining inverter.
The output interface 230, for exporting when receiving the first control signal of the generation of processing unit 220
The first control signal, so that the output power of photovoltaic combining inverter reaches target output value；It is single when receiving processing
When the second control signal that member 220 generates, the second control signal is exported, so that the output power of photovoltaic combining inverter reaches
Target output value.
The controller of gird-connected inverter provided in this embodiment controls photovoltaic grid-connected inversion when power limit is larger
The output power of device is to make the output power reach power limit requirement；When power limit is smaller, by limiting photovoltaic
The input power of gird-connected inverter controls the output power of photovoltaic combining inverter.When the output power of photovoltaic combining inverter
When smaller, voltage, the current characteristics of DC side are stablized, and acquisition and control error are smaller, therefore when power limit is smaller, adopt
It can be improved the control precision of power limit with the mode of control input power.
In another aspect, the present invention also provides a kind of photovoltaic combining inverter, referring to Figure 13, the photovoltaic combining inverter packet
Include controller 310 and inverter module 320；
The controller 310 is calculated for receiving power limit dispatch command, and according to the power limit dispatch command
To target output value；Compare target output value and output power threshold value；If target output value is greater than or equal to
Output power threshold value then controls the output power of inverter module, so that the output power of inverter module reaches target output
Value；If target output value is less than output power threshold value, the input power of inverter module 320 is controlled, so that inverter module
320 output power reaches target output value.
The controller of photovoltaic combining inverter provided in this embodiment controls grid-connected when power limit is larger
The output power of inverter is to make the output power reach power limit requirement；When power limit is smaller, pass through control
The input power of photovoltaic combining inverter controls the output power of photovoltaic combining inverter.When the output of photovoltaic combining inverter
When power is smaller, voltage, the current characteristics of DC side are stablized, and acquisition and control error are smaller therefore smaller in power limit
When, it can be improved the control precision of power limit by the way of controlling input power.
For the various method embodiments described above, for simple description, therefore, it is stated as a series of action combinations, but
Be those skilled in the art should understand that, the present invention is not limited by the sequence of acts described because according to the present invention, certain
A little steps can be performed in other orders or simultaneously.Secondly, those skilled in the art should also know that, it is retouched in specification
The embodiment stated belongs to preferred embodiment, and related actions and modules are not necessarily necessary for the present invention.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
Step in each embodiment method of the application can be sequentially adjusted, merged and deleted according to actual needs.
Device in each embodiment of the application and the module in terminal and submodule can merge according to actual needs,
It divides and deletes.
In several embodiments provided herein, it should be understood that disclosed terminal, device and method, Ke Yitong
Other modes are crossed to realize.For example, terminal embodiment described above is only schematical, for example, module or submodule
Division, only a kind of logical function partition, there may be another division manner in actual implementation, for example, multiple submodule or
Module may be combined or can be integrated into another module, or some features can be ignored or not executed.Another point is shown
The mutual coupling, direct-coupling or communication connection shown or discussed can be through some interfaces, between device or module
Coupling or communication connection are connect, can be electrical property, mechanical or other forms.
Module or submodule may or may not be physically separated as illustrated by the separation member, as mould
The component of block or submodule may or may not be physical module or submodule, it can and it is in one place, or
It may be distributed on multiple network modules or submodule.Some or all of mould therein can be selected according to the actual needs
Block or submodule achieve the purpose of the solution of this embodiment.
In addition, each functional module or submodule in each embodiment of the application can integrate in a processing module
In, it is also possible to modules or submodule physically exists alone, it can also be integrated with two or more modules or submodule
In a module.Above-mentioned integrated module or submodule both can take the form of hardware realization, can also use software function
Energy module or the form of submodule are realized.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments can be realized those skilled in the art or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with the principles and novel features disclosed in this article widest
Range.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of photovoltaic combining inverter power limitation method characterized by comprising
Power limit dispatch command is received, and target output value is calculated according to the power limit dispatch command；
Compare the target output value and output power threshold value；
If the target output value is greater than or equal to the output power threshold value, the photovoltaic combining inverter is controlled
Output power, so that the output power reaches the target output value；
If the target output value is less than the output power threshold value, the input work of the photovoltaic combining inverter is controlled
Rate, so that the output power reaches the target output value.
2. if the method according to claim 1, wherein the target output value is greater than or equal to institute
Output power threshold value is stated, then controls the output power of the photovoltaic combining inverter, so that the output power reaches the mesh
Mark output power value, comprising:
According to the target output value, and the alternating voltage of the photovoltaic combining inverter obtained, mesh is calculated
Mark current value；
The output electric current for controlling the photovoltaic combining inverter reaches the target current value, so that the output power reaches institute
State target output value.
3. if the method according to claim 1, wherein the target output value is less than the output
Power threshold then controls the input power of the photovoltaic combining inverter, so that the output power reaches the target output
Performance number, comprising:
If the target output is greater than zero and is less than the output power threshold value, the target output value is converted
For the target input power value of the photovoltaic combining inverter；
Obtain the input power of the photovoltaic combining inverter；
The DC voltage of the photovoltaic combining inverter is adjusted, so that the input power of the photovoltaic combining inverter reaches described
Target input power value.
4. according to the method described in claim 3, it is characterized in that, the direct current of the adjustment photovoltaic combining inverter
Pressure, so that the input power of the photovoltaic combining inverter reaches the target input power value, comprising:
According to first voltage adjusting step, repetition adjusts the current DC voltage of the photovoltaic combining inverter, until according to tune
The input power that the DC current of DC voltage and the collected photovoltaic combining inverter after whole calculates reaches institute
State target input power value, wherein the first voltage adjusting step is greater than zero.
5. the method according to claim 1, wherein the target output value is equal to zero；
If the target output value is less than the output power threshold value, the defeated of the photovoltaic combining inverter is controlled
Enter power, so that the output power of the photovoltaic combining inverter reaches the target output value, comprising:
If the target output is equal to zero, according to second voltage adjusting step, repetition adjusts the photovoltaic grid-connected inversion
The current DC voltage of device, until DC voltage adjusted is greater than the open-circuit voltage and default electricity of the photovoltaic combining inverter
The sum of pressure value, the preset voltage value are greater than the second voltage adjusting step, and the second voltage adjusting step is greater than zero.
6. method according to claim 1-5, which is characterized in that in reception power limit dispatch command, and according to
After target output value is calculated according to the power limit dispatch command, the method also includes:
Obtain the present output power of the photovoltaic combining inverter；
Compare the present output power and the target output value；
If the present output power is less than the target output value, terminate current power limitation process；
If the present output power is greater than or equal to the target output value, the relatively target output is executed
The step of value is with output power threshold value.
7. a kind of photovoltaic combining inverter power limitation device characterized by comprising
Dispatch command receiving module is calculated for receiving power limit dispatch command, and according to the power limit dispatch command
To target output value；
Comparison module, for the target output value and output power threshold value；
First control module controls institute if being greater than or equal to the output power threshold value for the target output value
The output power of photovoltaic combining inverter is stated, so that the output power of the photovoltaic combining inverter reaches the target output work
Rate value；
Second control module controls the photovoltaic if being less than the output power threshold value for the target output value
The input power of gird-connected inverter, so that the output power of the photovoltaic combining inverter reaches the target output value.
8. device according to claim 7, which is characterized in that first control module, comprising:
Target current acquisition submodule, for according to the target output value, and the photovoltaic grid-connected inversion of acquisition
The alternating voltage of device, is calculated target current value；
Current control submodule is exported, the output electric current for controlling the photovoltaic combining inverter reaches the target current
Value, so that the output power of the photovoltaic combining inverter reaches the target output value.
9. a kind of controller of photovoltaic combining inverter characterized by comprising input interface, processing unit, output interface；
The input interface for receiving power limit dispatch command, and is supplied to the processing unit；
The processing unit, for target output value to be calculated according to the power limit dispatch command；Compare described
Target output value and output power threshold value, if the target output value is greater than or equal to the output power threshold value,
The first control signal for controlling the output power of the photovoltaic combining inverter is then generated, if the target output value is less than
The output power threshold value then generates the second control signal for controlling the input power of the photovoltaic combining inverter；
The output interface, for when receiving the first control signal that the processing unit generates, export this first
Signal is controlled, so that the output power of the photovoltaic combining inverter reaches the target output value；It is described when receiving
When the second control signal that processing unit generates, the second control signal is exported, so that the photovoltaic combining inverter
Output power reaches the target output value.
10. a kind of photovoltaic combining inverter characterized by comprising controller and inverter module；
Target is calculated for receiving power limit dispatch command, and according to the power limit dispatch command in the controller
Output power value；Compare the target output value and output power threshold value；If the target output value is greater than or waits
In the output power threshold value, then the output power of the inverter module is controlled, so that the output power of the inverter module reaches
To the target output value；If the target output value is less than the output power threshold value, the inversion is controlled
The input power of module, so that the output power of the inverter module reaches the target output value.
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