CN115995843A - Photovoltaic power generation countercurrent prevention control method and system - Google Patents
Photovoltaic power generation countercurrent prevention control method and system Download PDFInfo
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Abstract
The invention discloses a photovoltaic power generation anti-reflux control method and a photovoltaic power generation anti-reflux control system, wherein the method comprises the following steps: reading the electricity generation power of the ammeter; if the electricity meter power is smaller than the anti-backflow power, acquiring the total inverter power of historical statistics, and starting a broadcast anti-backflow scheme; if the electricity meter power is greater than the anti-backflow power, acquiring rated power of each inverter and power generated by the inverter, and calculating and acquiring total inverter power generated by the rated power of each inverter and the power generated by the inverter; judging the fluctuation amplitude of the load, if the fluctuation amplitude of the load is larger than a broadcast backflow prevention control threshold value, starting a broadcast backflow prevention scheme, otherwise starting a single backflow prevention scheme, and enabling the energy among the inverters to be mutually scheduled through the broadcast backflow prevention and directional single backflow prevention mode, so that the energy can be efficiently converted into electric energy while meeting the backflow prevention requirement.
Description
Technical Field
The invention belongs to the field of photovoltaic power generation anti-reflux control, and particularly relates to a photovoltaic power generation anti-reflux control method.
Background
In the existing photovoltaic power generation anti-reflux scheme, a data monitoring module needs to communicate with each photovoltaic inverter in real time, so that acquired real-time data packets are uploaded to a network platform; in the process of reading real-time data, the acquired generating capacity information of each machine is accumulated and counted, and the current power value of the ammeter is collected to calculate the power consumed by the current load, so that the generating capacity of the photovoltaic inverter PV is rapidly controlled, the load demand is met, and meanwhile, the power is not reversed to the power grid, and the power generation rate between machines is balanced and reasonable.
The existing data monitoring module starts to control the anti-backflow after the monitoring module polls and collects the parallel operation real-time data, and the anti-backflow efficiency is low, so that at most 3 grid-connected machines are supported; because each inverter is controlled by broadcasting countercurrent prevention, the power generation efficiency of machines with high rated power is low, and the energy distribution among the machines is uneven; meanwhile, the existing scheme only supports Suntrio Plus series industrial and commercial photovoltaic inverters, is not compatible with other types of inverters, and supports few types of different types of machines.
Disclosure of Invention
Aiming at least one technical problem, the invention provides a novel anti-backflow technical scheme, which supports a plurality of inverters of different types, supports dynamic collection of a plurality of inverters and controls the inverters in real time and efficiently. Meanwhile, energy scheduling among inverters is supported, and efficient power generation is achieved.
The technical scheme adopted by the invention is as follows: the invention provides a photovoltaic power generation anti-reflux control method, which comprises the following steps:
reading the electricity generation power of the ammeter;
if the electricity meter power is smaller than the anti-backflow power, acquiring the total inverter power of historical statistics, and broadcasting the anti-backflow power;
if the electricity meter power is greater than the anti-backflow power, acquiring rated power of each inverter and power generated by the inverter, and calculating and acquiring total inverter power generated by the rated power of each inverter and the power generated by the inverter;
judging the fluctuation amplitude of the load, if the fluctuation amplitude of the load is larger than a broadcast backflow prevention control threshold value, carrying out broadcast backflow prevention, otherwise, carrying out single backflow prevention.
Further, the calculation mode of the anti-backflow power is as follows:
PowerLimit＝ITPower+MPower-ΣI n RatePower*Permillage/1000+Δ
(1 < = N < = 10), wherein = -100 x max;
in the above formula, powerLimit represents anti-backflow power, ITPower represents total inverter power generation, MPower represents ammeter value, permiltage represents setting anti-backflow power thousandth ratio, INRatePower represents rated power of each inverter, and MAX represents on-line number of inverters.
Further, the broadcast backflow prevention threshold is 100×max, where max refers to the number of on-line inverters.
Further, the calculation method of the load fluctuation amplitude comprises the following steps: loadpower=inpower+mpower, where INPower is the sum of the generated powers of the inverters, and MPower represents the generated power of the electricity meter.
Further, the broadcasting anti-reverse flow method includes:
traversing all inverters to obtain a total parallel operation value of history statistics;
calculating anti-backflow power, and enabling the anti-backflow power to be equal to the total inverter power;
setting the address of a slave in the Modbus protocol, wherein the written value is the anti-backflow thousandth;
sending a control anti-reflux thousandth to the inverter;
after the anti-backflow thousandth is received by the inverter, the inverter controls and adjusts the generating capacity of the photovoltaic generator according to the rated power of the inverter.
Further, the method is characterized in that the single counter-flow prevention is performed, and the method comprises the following steps:
the inverter traverses according to the sequence from small rated power to large rated power;
acquiring a 485 address of a corresponding inverter;
calculating anti-backflow power, and accumulating the total inverter generated power to a current generated power fluctuation value to be controlled;
setting the address of a slave machine in the Modbus protocol as a 485 address corresponding to the inverter, and setting the write value as an anti-backflow thousandth;
sending a control anti-reflux thousandth to the inverter;
after the anti-backflow thousandth is received by the inverter, the inverter controls and adjusts the generating capacity of the photovoltaic generator according to the rated power of the inverter.
Further, the calculation method of the fluctuation value of the current generation power to be controlled comprises the following steps: p1=mpower-ITPower =permallage/1000+Δ, = -100 x max; wherein MPower represents the power generation power of an ammeter, ITPower represents the total inverter power generation power, permiltage represents the set anti-backflow power thousandth ratio, and MAX represents the on-line number of inverters;
further, the calculation method of the anti-reflux thousandth comprises the following steps: power_percentage= (PowerLimit 1000)/ITPower; wherein Power_Percent represents an anti-reflux thousandth, powerLimit represents anti-reflux Power, and ITPower represents total inverter Power generation.
On the other hand, the invention also provides a photovoltaic power generation anti-reflux control system, which is characterized by comprising:
the ammeter is used for reading the total generated power;
the inverter is used for preventing photovoltaic power generation from flowing back to the power grid, namely, the inverter realizes the function of preventing the photovoltaic power generation from flowing back;
the monitoring module is used for regulating and controlling the power collected by the inverter and comprises a SEC-monitoring module which is connected with the inverter through a 485 line star;
a control module for executing the photovoltaic power generation anti-reflux control method of claim 1.
Further, the monitoring module comprises a SEC-monitoring module, and is connected with the inverter through a 485-wire star.
Further, the inverter comprises an industrial and commercial photovoltaic inverter and a household photovoltaic inverter.
The beneficial effects of the invention are as follows: according to the scheme, the power generation conversion rate of the inverters is controlled to the maximum extent through the broadcast anti-backflow and directional single anti-backflow mode, so that energy among the inverters is mutually scheduled, the anti-backflow requirement is met, meanwhile, electric energy is efficiently converted through photovoltaic, and the user benefit is guaranteed. Meanwhile, the invention can support a plurality of inverters of different types and support the collection and communication of at most 10 inverters.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an anti-reflux system;
FIG. 2 is a schematic diagram illustrating an inverter distribution according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an inverter in the embodiment of the present invention in the case of inconsistent grid-connected and off-grid time;
FIG. 4 is a schematic diagram of a total flow path of the system for preventing reverse flow according to an embodiment of the present invention.
Detailed Description
The present application is further described below with reference to the drawings and specific examples. The described embodiments should not be construed as limitations on the present application, and all other embodiments, which may be made by those of ordinary skill in the art without the exercise of inventive faculty, are intended to be within the scope of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application.
Along with the development of new energy sources supported by China, the photovoltaic system is actively pushed to generate power, when a grid-connected inverter generates power to a power grid, the voltage control difficulty of the power grid is increased, the voltage stability performance of the power grid is affected, an additional anti-backflow device such as an ammeter is needed, the current power value of the ammeter is collected, the power consumed by the current load is calculated, and accordingly the PV generating capacity of the photovoltaic inverter is rapidly controlled, the load requirement is met, meanwhile, the photovoltaic inverter does not flow back to the power grid, and the power generation rate among the inverters is balanced and reasonable, so that a novel anti-backflow control technology is very important.
In the existing anti-countercurrent technical scheme, the monitoring module starts to control the anti-countercurrent after collecting parallel operation real-time data, the anti-countercurrent effect reaches 10s, and the anti-countercurrent efficiency is low, so that 3 grid-connected machines are supported at most; because each inverter is controlled by the broadcast anti-reflux, the power generation efficiency of the inverter with high rated power is low, and the energy distribution among the inverters is uneven; only support Suntrio Plus series industrial and commercial photovoltaic inverters, not compatible other types of inverters, support different types of inverters less in variety.
Aiming at the problem, the embodiment of the invention provides a photovoltaic power generation anti-reflux control scheme, wherein a single anti-reflux mode of anti-reflux and directional anti-reflux is broadcasted, so that the power generation conversion rate of the inverters is controlled to the maximum extent, the energy among the inverters is mutually scheduled, the anti-reflux requirement is met, meanwhile, the electric energy is efficiently converted, and the user benefit is ensured. Meanwhile, the invention can support a plurality of inverters of different types and support the collection and communication of at most 10 inverters.
Fig. 1 is a wiring schematic diagram of an anti-backflow system according to an embodiment of the present invention, and fig. 2 is a distribution schematic diagram of an inverter according to an embodiment of the present invention, where the two diagrams show a system anti-backflow scheme, and a monitoring module, an inverter and an ammeter under a power station are connected in a wired manner.
In the embodiment of the invention, the monitoring module adopts the SEC-C monitoring module, and the SEC-C monitoring module supports industrial and commercial photovoltaic inverters and household photovoltaic inverters, is compatible with supporting real-time data of different types of inverters, and maintains the specific monitoring data acquisition reporting function and the backflow preventing function. Compared with the prior art that the anti-reflux scheme only supports grid-connected inverters, the software architecture of the SEC-C monitoring module is suitable for various inverters, the expansion is convenient, and meanwhile, the hardware link of the SEC-C module is additionally provided with the RS485 interface anti-interference design, so that the monitoring module is more stable.
In the embodiment of the invention, the anti-reflux system using the SEC-C monitoring module supports at most 10 inverters, and because each inverter needs to be finely tuned to control 500ms refreshing period in order to meet the maximum energy utilization rate while the anti-reflux is realized in the first large power regulation proportion, under the condition of 10 inverters with different rated power sections, the anti-reflux effect is realized by quickly finely tuning several parallel operation, and meanwhile, after the parallel operation is polled for 5s (the time is equal to 0.5 x N, N=10), the generated energy of the parallel operation can be broadcasted and regulated when the load of the next round fluctuates greatly. The method comprehensively considers various factors such as inconsistent control power generation lifting rate of different types of inverters, and interference of link communication quality with more parallel machines, so that at most 10 inverters are supported. Compared with an anti-reflux system only supporting 3 inverters for monitoring and only supporting broadcast anti-reflux regulation and control inverters in the prior art, the system using the SEC-C monitoring module supports the collection of at most 10 inverters, and the function of regulating and controlling a single inverter is added in the anti-reflux mode, so that the photovoltaic energy is prevented from flowing into a power grid more efficiently.
Fig. 3 is a schematic diagram of an inverter in the case of inconsistent grid-connected and off-grid time, in the embodiment of the invention, when the situation of inconsistent grid-connected and off-grid time of 10 inverters occurs, or 10 inverters are connected in a field installation manner, the equipment information and the real-time data information of the inverters are dynamically polled and inquired, so that the polling efficiency is optimized, the generated energy of all the inverters under a power station is rapidly counted, the load consumption is obtained, and the efficient anti-backflow control effect is achieved.
Fig. 4 is a schematic diagram of a total flow of a system for preventing reverse flow according to an embodiment of the present invention, and in an embodiment of the present invention, broadcast reverse flow prevention logic is as follows:
when the load fluctuates, the reverse flow to the power grid occurs, and the inverter needs to be quickly regulated to reduce the PV power.
And (3) dynamically refreshing the ammeter data in real time for 300ms, acquiring an ammeter MPower value, broadcasting and controlling the generated energy of all inverters according to the total inverter generated power ITPower of historical statistics, and realizing the anti-backflow stability within 2 s.
The electric meter backflow prevention mode is a total power backflow prevention mode, a backflow prevention power micrometer value Permiltage is set, and rated power I of each inverter is set N RatePower (1 therein<＝N<＝10)
In the reverse flow prevention control fig. 4, the reverse flow prevention value:
PowerLimit＝ITPower+MPower-∑I N RatePower*Permillage/1000+Δ
(1 < = N < = 10), wherein Δ= -100 x max
Anti-reflux thousandth:
Power_Percent＝(PowerLimit*1000)/ITPower
the power_percent is calculated, the reverse flow prevention thousandths are issued to each inverter through the RS485 bus in a broadcasting way, and each inverter controls the PV Power generation amount according to the rated Power of the inverter, so that the 10 inverters can reduce the PV Power generation amount in a short time.
For example, a inverter rated power IRatePower, a inverter controls PV power generation:
PV_Power＝(IRatePower*Power_Percent)/1000。
after each control broadcast anti-countercurrent, the system enables ITPower to be equal to PowerLimit, and the next fast anti-countercurrent regulation is convenient.
When the load fluctuates and electricity is purchased from the power grid, the inverter needs to be regulated to increase the PV power generation efficiency.
When the load fluctuation range is greater than 100 xMAX (MAX: the online number of inverters), 10 inverters are controlled through broadcast backflow prevention, wherein delta= -100 xMAX is adopted, and the purpose of quickly and greatly regulating the generated power is achieved, so that backflow to a power grid is avoided; when the load fluctuation range is less than or equal to 100×max, starting a single anti-backflow, wherein Δ=50×max.
The electric meter backflow prevention mode is a total power backflow prevention mode, a backflow prevention power micrometer value Permiltage is set, and rated power I of each inverter is set N RatePower, dynamically collecting the power generation I of each inverter N Power, total inverter PV Power generation ITPower= ΣI N RatePower (1 therein<＝N<＝10)。
The embodiment of the invention provides a broadcasting anti-countercurrent scheme and a directional single anti-countercurrent scheme, and the single anti-countercurrent logic is as follows: and (3) preferentially controlling the inverter A with the maximum rated power to perform fine-tuning PV power generation, waiting for re-monitoring whether the load fluctuation range is smaller than or equal to 100 x MAX, starting to control the inverter B with the larger rated power to perform fine-tuning PV power generation, continuously re-monitoring the load fluctuation range, and finally controlling the fine-tuning PV power generation by each inverter, wherein no single anti-backflow operation is continued. If fluctuation with a larger load range occurs or the solar light receiving capacity of the photovoltaic panel becomes strong in the process of controlling the single anti-reflux, the single anti-reflux is exited, each control state is cleared, and a new round of broadcast anti-reflux is performed.
For example: rated power I of inverter A 1 RatePower, the power generated by the electricity meter MPower.
Currently, the fluctuation value of the generated power needs to be controlled
P1＝MPower-ITPower*Permillage/1000+Δ (1)
The last broadcast anti-reflux ratio Power_percent corresponds to the Power generated by the inverter A
P2＝(Power_Percent*I 1 RatePower)/1000 (2)
Therefore, the reverse flow prevention value of the inverter A is controlled
PowerLimit 1 ＝P1+P2 (3)
Reverse flow prevention ratio of inverter A
Power_Percent 1 ＝(PowerLimit 1 *1000)/I 1 RatePower (4)
Calculating to obtain Power_Percent 1 Assigned to the A inverter by 485 address assignment, and the A inverter is used for controlling the power according to the rated power I 1 RatePower controls the PV Power generation, PV_Power, thus making the A inverter photovoltaic more efficient, wherein
A, generating capacity of an inverter PV:
PV_Power＝(I 1 RatePower*Power_Percent 1 )/1000 (5)
after each single control anti-reflux, the ITPower accumulates P1, so that the next fast anti-reflux regulation and control is facilitated.
According to the embodiment of the invention, the power generation conversion rate of the inverters is controlled to the maximum extent through the broadcast anti-backflow and directional single anti-backflow mode, so that the energy among the inverters is mutually scheduled, the anti-backflow requirement is met, meanwhile, the electric energy is efficiently converted through the photovoltaic, and the user benefit is ensured.
Claims (10)
1. A photovoltaic power generation anti-reflux control method, characterized in that the method comprises:
reading the electricity generation power of the ammeter;
if the electricity meter power is smaller than the anti-backflow power, acquiring the total inverter power of historical statistics, and broadcasting the anti-backflow power;
if the electricity meter power is greater than the anti-backflow power, acquiring rated power of each inverter and power generated by the inverter, and calculating and acquiring total inverter power generated by the rated power of each inverter and the power generated by the inverter;
judging the fluctuation amplitude of the load, if the fluctuation amplitude of the load is larger than a broadcast backflow prevention control threshold value, carrying out broadcast backflow prevention, otherwise, carrying out single backflow prevention.
2. The photovoltaic power generation anti-reflux control method according to claim 1, wherein the anti-reflux power is calculated by:
PowerLimit--ITPower+MPower-∑I n RatePower*Permillage/1000+n
(1 < = N < = 10), wherein Δ= -100 x max;
in the formula, powerLimit represents anti-reflux power, ITPower represents total inverter power generation, MPower represents ammeter value, permiltage represents setting anti-reflux power thousandth ratio, I N RatePower represents the rated power of each inverter, and MAX represents the number of inverters online.
3. The method for controlling reverse current prevention of photovoltaic power generation according to claim 1, wherein the broadcast reverse current prevention threshold is 100×max, max being the number of inverters on line.
4. The photovoltaic power generation reverse flow prevention control method according to claim 1, wherein the calculation method of the load fluctuation amplitude is as follows: loadpower= Σi N Power+MPower, wherein ΣI N Power is the sum of the Power generated by the inverters, and MPower is the Power generated by the electricity meter.
5. The method for controlling reverse flow prevention of photovoltaic power generation according to claim 1, wherein the broadcasting reverse flow prevention comprises:
traversing all inverters to obtain a total parallel operation value of history statistics;
calculating anti-backflow power, and enabling the anti-backflow power to be equal to the total inverter power;
setting the address of a slave in the Modbus protocol, wherein the written value is the anti-backflow thousandth;
sending a control anti-reflux thousandth to the inverter;
after the anti-backflow thousandth is received by the inverter, the inverter controls and adjusts the generating capacity of the photovoltaic generator according to the rated power of the inverter.
6. The method for controlling reverse flow prevention of photovoltaic power generation according to claim 1, wherein the performing of single reverse flow prevention comprises:
the inverter traverses according to the sequence from small rated power to large rated power;
acquiring a 485 address of a corresponding inverter;
calculating anti-backflow power, and accumulating the total inverter generated power to a current generated power fluctuation value to be controlled;
setting the address of a slave machine in the Modbus protocol as a 485 address corresponding to the inverter, and setting the write value as an anti-backflow thousandth;
sending a control anti-reflux thousandth to the inverter;
after the anti-backflow thousandth is received by the inverter, the inverter controls and adjusts the generating capacity of the photovoltaic generator according to the rated power of the inverter.
7. The photovoltaic power generation backflow prevention control method according to claim 6, wherein the current power generation power fluctuation value to be controlled calculation method is as follows: p1=mpower-ITPower =permallage/1000+Δ, Δ= -100 x max; wherein the method comprises the steps of
MPower represents the power generation power of the ammeter, ITPower represents the total inverter power generation power, permiltage represents the set anti-backflow power thousandth ratio, and MAX represents the on-line number of inverters.
8. The photovoltaic power generation backflow prevention control method according to claims 5-6, wherein the calculation method of the backflow prevention thousandth is as follows: power_percentage= (PowerLimit 1000)/ITPower; wherein Power_Percent represents an anti-reflux thousandth, powerLimit represents anti-reflux Power, and ITPower represents total inverter Power generation.
9. A photovoltaic power generation anti-reflux control system, characterized by comprising:
the ammeter is used for reading the total generated power;
the inverter is used for preventing photovoltaic power generation from flowing back to the power grid, namely, the inverter realizes the function of preventing the photovoltaic power generation from flowing back;
the monitoring module is used for regulating and controlling the acquisition power of the inverter;
a control module for executing the photovoltaic power generation anti-reflux control method of claims 1-8.
10. The photovoltaic power generation backflow prevention control system of claim 9, wherein the inverter comprises an industrial and commercial photovoltaic inverter, a consumer photovoltaic inverter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117154952A (en) * | 2023-10-30 | 2023-12-01 | 苏州腾圣技术有限公司 | Control method and device for anti-backflow intelligent ammeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117154952A (en) * | 2023-10-30 | 2023-12-01 | 苏州腾圣技术有限公司 | Control method and device for anti-backflow intelligent ammeter |
| CN117154952B (en) * | 2023-10-30 | 2024-02-09 | 苏州腾圣技术有限公司 | Control method and device for anti-backflow intelligent ammeter |
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