CN107017665B - A kind of inversion system and the super distribution controlling method of inverter - Google Patents
A kind of inversion system and the super distribution controlling method of inverter Download PDFInfo
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Abstract
The present invention provides a kind of inversion system and the super distribution controlling method of inverter, by calculating the DC voltage of inverter and exchanging side output power, judges whether the two meets high pressure full-load run condition；If the DC voltage of inverter meets high pressure full-load run condition with side output power is exchanged, then control the shutdown of at least one switching device of DC side, to reduce the input power of photovoltaic array, in the case where guaranteeing the exchange side output of inverter to allow maximum power, it is controlled by MPPT maximum power point tracking, declines the DC voltage of inverter；Ongoing operation is until the DC voltage of inverter drops to preset threshold, it ensure that the maximum power output of inverter, the operating point DC voltage of inverter is reduced again, it avoids in the prior art when the output power of photovoltaic array is greater than the maximum power that inverter can export, the excessively high influence inverter longevity of operating point DC voltage, and reduce system operation reliability, reduce the problem of system generated energy in turn.
Description
Technical field
The present invention relates to technical field of inverter control, in particular to a kind of inversion system and inverter are super with controlling party
Method.
Background technique
In the application field of inverter, there are some factors to be greater than inverter energy for the output power that will lead to DC power supply
The maximum power enough exported；Such as when inverter is in super under working condition, that is, assuming that the rated power of inverter is P, and
The capacity for configuring its photovoltaic array is N*P, so that inverter is under the conditions of certain illumination temperature, output power will be greater than P.
Match when inverter is super, and under the conditions of certain illumination and temperature, the output power of photovoltaic array is greater than inverter energy
When the maximum power enough exported, the MPP electrical voltage point Umpp that inverter will cannot work in photovoltaic array output, and operating point direct current
Voltage can be greater than MPP electrical voltage point Umpp；Super to match more, operating point DC voltage will be higher.
And inverter work is in higher DC voltage, it will influence inverter longevity, and it is full to continue High Level DC Voltage
The case where carrying row may trigger some protections of inverter itself, and inverter is caused to will appear high pressure drop volume or even shut down,
And then reduce system generated energy.
Summary of the invention
The present invention provides a kind of inversion system and the super distribution controlling method of inverter, to solve in the prior art in photovoltaic array
Output power be greater than inverter can export maximum power when, the excessively high influence inverter longevity of operating point DC voltage, and
And the problem of reducing system operation reliability and then reducing system generated energy.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of super distribution controlling method of inverter, applied to the controller of inversion system, the controller and switching device connect
It connects；The input terminal of each switching device has been at least connected with a photovoltaic module, and the output end of multiple switch device is connected in parallel to inversion
The DC side of device；The super distribution controlling method of inverter includes:
Calculate the DC voltage of the inverter with exchange side output power；
Judge the DC voltage of the inverter with exchange whether side output power meets high pressure full-load run condition；
If the DC voltage of the inverter meets the high pressure full-load run condition with side output power is exchanged, control
At least one described switching device shutdown is made, to reduce the input power of photovoltaic array, in the exchange side for guaranteeing the inverter
In the case that output is allows maximum power, controlled by MPPT maximum power point tracking, under the DC voltage for making the inverter
Drop；
The step of DC voltage for calculating the inverter is with side output power is exchanged is returned to, until the inversion
The DC voltage of device drops to preset threshold；The preset threshold is less than or equal to the maximum DC voltage that the inverter allows
Value.
Preferably, after the DC voltage of the inverter drops to preset threshold, further includes:
Calculate the exchange side output power of the inverter；
According to the exchange side output power of the inverter, judge whether the inverter has dropped out full-load run state；
If the inverter has dropped out full-load run state, the switching device closure of shutdown is controlled.
Preferably, the high pressure full-load run condition includes:
The exchange side output power of the inverter is within the scope of default full-load power value return difference, and the inverter is straight
It flows side voltage and is greater than the maximum DC voltage value that the inverter allows.
It is preferably, described to judge whether the inverter has dropped out full-load run state, comprising:
Judge whether the exchange side output power of the inverter is less than default full-load power value；
If the exchange side output power of the inverter is less than the default full-load power value, the inverter has been determined
Exit full-load run state.
A kind of inversion system, the inversion system include: inverter, controller and multiple switch device；Wherein:
The input terminal of each switching device has been at least connected with a photovoltaic module, and the output end of multiple switch device is connected in parallel to
The DC side of the inverter；
The controller is connect with switching device；
The controller is used for: calculate the DC voltage of the inverter with exchange side output power；Judge described inverse
Become device DC voltage with exchange whether side output power meets high pressure full-load run condition；If the DC side of the inverter
Voltage meets the high pressure full-load run condition with side output power is exchanged, then controls at least one described switching device shutdown,
To reduce the input power of photovoltaic array, in the case where guaranteeing the exchange side output of the inverter to allow maximum power,
It is controlled by MPPT maximum power point tracking, declines the DC voltage of the inverter；The controller ongoing operation is to described
The DC voltage of inverter drops to preset threshold；The preset threshold is less than or equal to the maximum direct current that the inverter allows
Voltage value.
Preferably, the controller is also used to: after the DC voltage of the inverter drops to preset threshold, meter
Calculate the exchange side output power of the inverter；According to the exchange side output power of the inverter, judge that the inverter is
It is no to have dropped out full-load run state；If the inverter has dropped out full-load run state, the switching device of shutdown is controlled
Closure.
Preferably, the high pressure full-load run condition includes:
The exchange side output power of the inverter is within the scope of default full-load power value return difference, and the inverter is straight
It flows side voltage and is greater than the maximum DC voltage value that the inverter allows.
Preferably, the controller is for being specifically used for when judging whether the inverter has dropped out full-load run state:
Judge whether the exchange side output power of the inverter is less than default full-load power value；If the exchange side of the inverter exports
Power is less than the default full-load power value, then determines that the inverter has dropped out full-load run state.
Preferably, the controller is integrated in the inverter.
Preferably, the switching device includes: controllable switch and electrically operated device；Wherein:
The controllable switch is connected between photovoltaic module and DC bus；
The input terminal of the electrically operated device and the controller communicate to connect；
The output end of the electrically operated device is connected with the control terminal of the controllable switch.
The super distribution controlling method of the inverter provided by the invention, by calculate inverter DC voltage with exchange side
Output power；Judge the DC voltage of inverter with exchange whether side output power meets high pressure full-load run condition；If inverse
The DC voltage for becoming device meets high pressure full-load run condition with side output power is exchanged, then controls at least one switching device pass
It is disconnected, to reduce the input power of photovoltaic array, the case where the exchange side output for guaranteeing the inverter is allows maximum power
Under, it is controlled by MPPT maximum power point tracking, declines the DC voltage of inverter；DC side of the ongoing operation up to inverter
Voltage drops to preset threshold, that is, ensure that the maximum power output of inverter, and reduces the operating point direct current of inverter
Pressure avoids in the prior art when the output power of photovoltaic array is greater than the maximum power that inverter can export, operating point
The excessively high influence inverter longevity of DC voltage, and reduce system operation reliability, reduce the problem of system generated energy in turn.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of the super distribution controlling method of inverter provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides inverter direct-flow side power and voltage between relational graph；
Fig. 3 be another embodiment of the present invention provides the super distribution controlling method of inverter flow chart；
Fig. 4 be another embodiment of the present invention provides inversion system structural schematic diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The present invention provides a kind of super distribution controlling method of inverter, to solve in the prior art in the output power of photovoltaic array
When the maximum power that can be exported greater than inverter, the excessively high influence inverter longevity of operating point DC voltage, and reduce system
The problem of operational reliability and then reduction system generated energy.
The super distribution controlling method of the inverter, applied to the controller of inversion system, controller is connect with switching device, specifically
It can be electrical connection or communication connection, be not specifically limited herein；The input terminal of each switching device has been at least connected with one
The output end of photovoltaic module, multiple switch device is connected in parallel to the DC side of inverter；Specifically, the super distribution controlling method of the inverter
Referring to Fig. 1, comprising:
S101, calculate inverter DC voltage and exchange side output power；
The DC voltage and DC side electric current that inverter can be obtained by corresponding detection device, according to the conservation of energy
Law, inverter direct-flow side power are that it exchanges side power, therefore its DC side power is calculated namely obtains its exchange
Side power.
S102, the DC voltage for judging inverter and exchange whether side output power meets high pressure full-load run condition；
Preferably, which includes:
The exchange side output power of inverter is within the scope of default full-load power value return difference, and the DC voltage of inverter
The maximum DC voltage value allowed greater than inverter.
Fig. 2 show the relationship between the power P pv of inverter direct-flow side and voltage Upv.Specifically, when inverter is super
Match, and under the conditions of certain illumination and temperature, when the output power of photovoltaic array is greater than the maximum power that inverter can export,
Inverter would operate under full load condition；If it is super with it is excessive when, A point on curve 1 as shown in Figure 2, the DC side electricity of inverter
It presses U2 that will be greater than the maximum DC voltage value Umax that inverter corresponding to B point allows, the longevity of inverter will be will affect at this time
Order and need to carry out certain voltage control.
Therefore, it if the DC voltage of inverter meets high pressure full-load run condition with side output power is exchanged, executes
Step S103；
S103, the shutdown of at least one switching device is controlled, to reduce the input power of photovoltaic array, is guaranteeing inverter
In the case where side output is exchanged to allow maximum power, is controlled by MPPT maximum power point tracking, make the DC voltage of inverter
Decline；
Step S101 to step S103 is repeated, until the DC voltage of inverter drops to preset threshold；This is pre-
If threshold value is less than or equal to the maximum DC voltage value that inverter allows.
After the switching device shutdown for controlling corresponding number, it will exported in the exchange side of inverter to allow maximum power
In the case of under Pout, controlled by MPPT maximum power point tracking, decline the DC voltage of inverter, referring to fig. 2, inverter
Dc voltage operation point is transitioned into the C point on curve 2 by the A point on original curve 1, at this time the operating point direct current of inverter
Pressure namely its DC voltage U1 are less than the maximum DC voltage value Umax that inverter corresponding to B point allows, and inverter is by work
Make under corresponding mode, only needs to open part photovoltaic module under this mode, do not changing inverter ac side output work
In the case where rate, the operating point DC voltage for controlling inverter is in safe range.
The super distribution controlling method of the inverter provided in this embodiment, by repeating above-mentioned steps, until inverter
DC voltage drops to preset threshold, that is, ensure that the maximum power output of inverter, and reduces the operating point of inverter
DC voltage avoids in the prior art when the output power of photovoltaic array is greater than the maximum power that inverter can export,
The excessively high influence inverter longevity of operating point DC voltage, and reduce system operation reliability and then reduce system generated energy
Problem.
Another embodiment of the present invention additionally provides the super distribution controlling method of another inverter, referring to Fig. 3, comprising:
S201, calculate inverter DC voltage and exchange side output power；
S202, the DC voltage for judging inverter and exchange whether side output power meets high pressure full-load run condition；
If the DC voltage of inverter meets high pressure full-load run condition with side output power is exchanged, then follow the steps
S203；
S203, the shutdown of at least one switching device is controlled, to reduce the input power of photovoltaic array, is guaranteeing the inversion
In the case that the exchange side output of device is allows maximum power, is controlled by MPPT maximum power point tracking, make the DC side of inverter
Voltage decline；
S204, judge whether the DC voltage of inverter drops to the maximum DC voltage value of inverter permission；
If the DC voltage of inverter does not drop to preset threshold, step S201 to S203 is repeated；If inversion
The DC voltage of device drops to preset threshold, thens follow the steps S205；The preset threshold, which is less than or equal to inverter, to be allowed most
Big DC voltage value.
S205, the exchange side output power for calculating inverter；
S206, the exchange side output power according to inverter, judge whether inverter has dropped out full-load run state；
If inverter has dropped out full-load run state, S207 is thened follow the steps；
The switching device closure that S207, control turn off.
For the present embodiment on the basis of a upper embodiment, inverter ought be judged according to the output power of inverter by giving
When having dropped out full-load run state, the control program of controller；Preferably, when the exchange side output power for judging inverter is less than
It when default full-load power value, then can determine that inverter has dropped out full-load run state, can control the switch dress having been turned off at this time
Set closure.
It is worth noting that turning off more than one switch before if repeating step S201 to S203 before
Device then illustrates the output that more optical crosstalk volt group strings or multiple photovoltaic modulies have been had been turned off in photovoltaic array；At this point, inverse when determining
When change device has dropped out full-load run state, then it can control the multiple switch device having been turned off and be closed one by one by several times, or is primary
It is closed at, and whether the current state of real-time judge inverter meets the high pressure full-load run condition, it is ensured that system maximum work
Rate exports and avoids taking into account for inverter high-voltage operation.
Another embodiment of the present invention additionally provides a kind of inversion system, and the inversion system is referring to fig. 4, comprising: inverter
100, controller and multiple switch device 200；Wherein:
The input terminal of each switching device 200 has been at least connected with a photovoltaic module, the output end of multiple switch device 200
It is connected in parallel to the DC side of inverter 100；
Controller is connect with switching device 200；
Controller is used for: calculate inverter 100 DC voltage with exchange side output power；Judge inverter 100
DC voltage with exchange whether side output power meets high pressure full-load run condition；If the DC voltage of inverter 100 and
Exchange side output power meets high pressure full-load run condition, then the shutdown of at least one switching device 200 is controlled, to reduce photovoltaic battle array
The input power of column passes through maximum power in the case where guaranteeing the exchange side output of the inverter to allow maximum power
Point tracing control, declines the DC voltage of inverter 100；Controller ongoing operation is until the DC side of inverter 100 is electric
Preset threshold is down in pressure, which is less than or equal to the maximum DC voltage value that inverter 100 allows.
The inversion system provided in this embodiment, repeats above-mentioned steps by controller, until inverter 100 is straight
Stream side voltage drops to preset threshold, that is, ensure that the maximum power output of inverter 100, and reduce the work of inverter 100
Make point DC voltage, avoids and be greater than the maximum that inverter 100 can export in the output power of photovoltaic array in the prior art
When power, the operating point DC voltage excessively high service life for influencing inverter 100, and reduce system operation reliability and then reduce
The problem of system generated energy.
Preferably, controller is also used to: after the DC voltage of inverter 100 drops to preset threshold, being calculated inverse
Become the exchange side output power of device 100；According to the exchange side output power of inverter 100, judge whether inverter 100 has dropped out
Full-load run state；If inverter 100 has dropped out full-load run state, the switching device 200 for controlling shutdown is connected.
Preferably, high pressure full-load run condition includes:
The exchange side output power of inverter 100 is within the scope of default full-load power value return difference, and the direct current of inverter 100
Side voltage is greater than the maximum DC voltage value that inverter 100 allows.
Preferably, controller is for being specifically used for when judging whether inverter 100 has dropped out full-load run state: judgement
Whether the exchange side output power of inverter 100 is less than default full-load power value；If the exchange side output power of inverter 100 is small
In default full-load power value, then determine that inverter 100 has dropped out full-load run state.
Preferably, controller is integrated in inverter 100.
Certainly, in specific practical application, which can be basis in inverter 100, as shown in figure 4,
It is also possible to be not specifically limited herein, within the scope of protection of this application independently of inverter 100.
Preferably, referring to fig. 4, switching device 200 includes: controllable switch and electrically operated device Motor；Wherein:
Controllable switch is connected between photovoltaic module and DC bus；
The input terminal and controller of electrically operated device Motor communicates to connect；
The output end of electrically operated device Motor is connected with the control terminal of controllable switch.
Communication link can be realized by cable technology or wireless technology between electrically operated device Motor and controller
It connects, is not specifically limited herein, it can be depending on its specific application environment, within the scope of protection of this application.
Remaining working principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (8)
1. a kind of super distribution controlling method of inverter, which is characterized in that applied to the controller of inversion system, the controller with open
Close device connection；The input terminal of each switching device has been at least connected with a photovoltaic module, and the output end of multiple switch device is simultaneously
It is coupled to the DC side of inverter；The super distribution controlling method of inverter includes:
Calculate the DC voltage of the inverter with exchange side output power；
Judge the DC voltage of the inverter with exchange whether side output power meets high pressure full-load run condition；Wherein,
The high pressure full-load run condition includes: the exchange side output power of the inverter in default full-load power value return difference range
It is interior, and the DC voltage of the inverter is greater than the maximum DC voltage value that the inverter allows；
If the DC voltage of the inverter meets the high pressure full-load run condition with side output power is exchanged, control to
A few switching device shutdown is exported with reducing the input power of photovoltaic array in the exchange side for guaranteeing the inverter
In the case where allowing maximum power, is controlled by MPPT maximum power point tracking, decline the DC voltage of the inverter；
The step of DC voltage for calculating the inverter is with side output power is exchanged is returned, until the inverter
DC voltage drops to preset threshold；The preset threshold is less than or equal to the maximum DC voltage value that the inverter allows.
2. the super distribution controlling method of inverter according to claim 1, which is characterized in that in the DC side electricity of the inverter
Pressure is down to after preset threshold, further includes:
Calculate the exchange side output power of the inverter；
According to the exchange side output power of the inverter, judge whether the inverter has dropped out full-load run state；
If the inverter has dropped out full-load run state, the switching device closure of shutdown is controlled.
3. the super distribution controlling method of inverter according to claim 2, which is characterized in that described whether to judge the inverter
Have dropped out full-load run state, comprising:
Judge whether the exchange side output power of the inverter is less than default full-load power value；
If the exchange side output power of the inverter is less than the default full-load power value, determine that the inverter has dropped out
Full-load run state.
4. a kind of inversion system, which is characterized in that the inversion system includes: inverter, controller and multiple switch device；Its
In:
The input terminal of each switching device has been at least connected with a photovoltaic module, and the output end of multiple switch device is connected in parallel to described
The DC side of inverter；
The controller is connect with switching device；
The controller is used for: calculate the DC voltage of the inverter with exchange side output power；Judge the inverter
DC voltage with exchange whether side output power meets high pressure full-load run condition；If the DC voltage of the inverter
Meet the high pressure full-load run condition with side output power is exchanged, then at least one described switching device shutdown is controlled, to subtract
The input power of small photovoltaic array passes through in the case where guaranteeing the exchange side output of the inverter to allow maximum power
MPPT maximum power point tracking control, declines the DC voltage of the inverter；The controller ongoing operation is until described inverse
The DC voltage for becoming device drops to preset threshold；The preset threshold is less than or equal to the maximum direct current that the inverter allows
Pressure value；Wherein, the high pressure full-load run condition includes: the exchange side output power of the inverter in default full-load power value
Within the scope of return difference, and the DC voltage of the inverter is greater than the maximum DC voltage value that the inverter allows.
5. inversion system according to claim 4, which is characterized in that the controller is also used to: in the inverter
DC voltage drops to after preset threshold, calculates the exchange side output power of the inverter；According to the inverter
Side output power is exchanged, judges whether the inverter has dropped out full-load run state；If the inverter has dropped out fully loaded fortune
Row state then controls the switching device closure of shutdown.
6. inversion system according to claim 5, which is characterized in that whether the controller is for judging the inverter
When having dropped out full-load run state, it is specifically used for: it is default fully loaded judges whether the exchange side output power of the inverter is less than
Performance number；If the exchange side output power of the inverter is less than the default full-load power value, the inverter has been determined
Exit full-load run state.
7. inversion system according to claim 4 or 5, which is characterized in that the controller is integrated in the inverter.
8. inversion system according to claim 4 or 5, which is characterized in that the switching device includes: controllable switch and electricity
Dynamic operating device；Wherein:
The controllable switch is connected between photovoltaic module and DC bus；
The input terminal of the electrically operated device and the controller communicate to connect；
The output end of the electrically operated device is connected with the control terminal of the controllable switch.
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| DE102019206704A1 (en) * | 2019-05-09 | 2020-11-12 | Audi Ag | Electric propulsion system and operating procedures |
| CN110553411A (en) * | 2019-09-11 | 2019-12-10 | 浙江正泰新能源开发有限公司 | Cascade heat collection system and control method thereof |
| CN111799837A (en) * | 2020-07-09 | 2020-10-20 | 深圳市禾望科技有限公司 | Photovoltaic system and control method thereof |
| CN111786409A (en) * | 2020-07-09 | 2020-10-16 | 深圳市禾望科技有限公司 | Photovoltaic inverter system and control method thereof |
| CN111786408A (en) * | 2020-07-09 | 2020-10-16 | 深圳市禾望科技有限公司 | Inversion system and control method thereof |
| CN111756072B (en) * | 2020-07-30 | 2022-04-08 | 阳光电源股份有限公司 | Control method and operation control method of MLPE (Multi-layer plasma injection Molding) equipment and photovoltaic 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 |
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| CN106203734A (en) * | 2016-07-27 | 2016-12-07 | 中国能源建设集团云南省电力设计院有限公司 | A kind of photovoltaic plant capacity surpasses distribution coefficient computational methods |
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| CN104025409A (en) * | 2011-12-23 | 2014-09-03 | 株式会社Kd动力 | Multi-inverter photovoltaic power generation system |
| CN106203734A (en) * | 2016-07-27 | 2016-12-07 | 中国能源建设集团云南省电力设计院有限公司 | A kind of photovoltaic plant capacity surpasses distribution coefficient computational methods |
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