CN110249497B - Bus voltage adjusting method and related equipment - Google Patents
Bus voltage adjusting method and related equipment Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
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- H02J3/385—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/38—Energy storage means, e.g. batteries, structurally associated with PV modules
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
A bus voltage regulating method and related equipment comprise the following steps: firstly, acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system (S201); the bus voltage is then adjusted based on the first reference amplitude and the actual amplitude (S202). By adopting the method and the device, the dynamic adjustment of the bus voltage can be realized, the adjustment range of the photovoltaic input voltage can be widened, and the high-voltage loss on the bus and the negative influence caused by high voltage and high temperature can be avoided.
Description
Technical Field
The application relates to the field of new energy, in particular to a bus voltage adjusting method and related equipment.
Background
Currently, in solar photovoltaic power generation/energy storage systems, due to single-stage inverter grid voltage limitation, the regulation range of the photovoltaic input voltage is narrow, resulting in a limited range of maximum power point tracking. In order to improve the photovoltaic voltage regulation range, many grid-connected inverters adopt a two-stage structure, wherein the front stage is a booster circuit and is responsible for photovoltaic voltage regulation, and the rear stage is used for grid-connected inversion. At the same time, the busbar voltage limits the regulation range of the photovoltaic input voltage. Aiming at the problem of limiting the regulating range of the bus voltage to the photovoltaic input voltage, the prior art generally widens the regulating range of the photovoltaic input voltage by improving the bus voltage. However, the continuous increase of the bus voltage not only reduces the conversion efficiency of the inverter, but also increases the temperature when the inverter is continuously operated in a high-voltage state, which adversely affects the system.
Disclosure of Invention
The embodiment of the application provides a bus voltage adjusting method. The dynamic adjustment of the bus voltage can be realized, so that the adjustment range of the photovoltaic input voltage is widened, and the high-voltage loss on the bus and the negative influence caused by high voltage and high temperature are avoided.
The embodiment of the application provides a method for regulating bus voltage, which comprises the following steps:
acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system, wherein the first reference amplitude is determined by tracking a maximum power point of the photovoltaic energy storage system;
and adjusting the bus voltage according to the first reference amplitude and the actual amplitude.
Wherein said adjusting said bus voltage according to said first reference amplitude and said actual amplitude comprises:
calculating a difference between the actual amplitude and the first reference amplitude;
and adjusting the bus voltage according to the difference value.
Wherein said adjusting said bus voltage according to said difference comprises:
determining a second reference amplitude of the bus voltage according to the difference value;
and adjusting the bus voltage according to the second reference amplitude.
Wherein said determining a second reference magnitude of said bus voltage based on said difference comprises:
and when the difference value is smaller than a first threshold value, taking the sum of the actual amplitude value and a first preset voltage amplitude value as the second reference amplitude value.
Wherein said adjusting said bus voltage according to said second reference amplitude comprises:
determining the maximum amplitude of the bus voltage according to the withstand voltage value of the bus capacitor in the photovoltaic energy storage system;
judging whether the second reference amplitude is larger than the maximum amplitude, and if the second reference amplitude is not larger than the maximum amplitude, regulating the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is larger than the maximum amplitude, regulating the amplitude of the bus voltage to the maximum amplitude.
Wherein said determining a second reference magnitude of said bus voltage based on said difference comprises:
and when the difference value is larger than a second threshold value, taking the difference between the actual amplitude value and a second preset voltage amplitude value as the second reference amplitude value.
Wherein said adjusting said bus voltage according to said second reference amplitude comprises:
determining the minimum amplitude of the bus voltage according to the output voltage of the inverter in the photovoltaic energy storage system;
judging whether the second reference amplitude is smaller than the minimum amplitude; if the second reference amplitude is not smaller than the minimum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is smaller than the minimum amplitude, regulating the amplitude of the bus voltage to the minimum amplitude.
The method for obtaining the first reference amplitude of the photovoltaic input voltage and the actual amplitude of the bus voltage in the photovoltaic energy storage system comprises the following steps:
and acquiring the first reference amplitude and the actual amplitude according to a preset time interval.
The embodiment of the application provides a bus voltage adjusting device, which comprises:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first reference amplitude of a photovoltaic input voltage and an actual amplitude of a bus voltage in a photovoltaic energy storage system, and the first reference amplitude is determined by tracking a maximum power point of the photovoltaic energy storage system;
and the adjusting module is used for adjusting the bus voltage according to the first reference amplitude and the actual amplitude.
Wherein, the adjustment module is further for:
calculating a difference between the actual amplitude and the first reference amplitude;
and adjusting the bus voltage according to the difference value.
Wherein, the adjustment module is further for:
determining a second reference amplitude of the bus voltage according to the difference value;
and adjusting the bus voltage according to the second reference amplitude.
Wherein, the adjustment module is further for:
and when the difference value is smaller than a first threshold value, taking the sum of the actual amplitude value and a first preset voltage amplitude value as the second reference amplitude value.
Wherein, the adjustment module is further for:
determining the maximum amplitude of the bus voltage according to the withstand voltage value of the bus capacitor in the photovoltaic energy storage system;
judging whether the second reference amplitude is larger than the maximum amplitude; if the second reference amplitude is not greater than the maximum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is larger than the maximum amplitude, regulating the amplitude of the bus voltage to the maximum amplitude.
Wherein, the adjustment module is further for:
and when the difference value is larger than a second threshold value, taking the difference between the actual amplitude value and a second preset voltage amplitude value as the second reference amplitude value.
Wherein, the adjustment module is further for:
determining the minimum amplitude of the bus voltage according to the output voltage of the inverter in the photovoltaic energy storage system;
judging whether the second reference amplitude is smaller than the minimum amplitude; if the second reference amplitude is not smaller than the minimum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is smaller than the minimum amplitude, regulating the amplitude of the bus voltage to the minimum amplitude.
Wherein, the acquisition module is further used for:
and acquiring the first reference amplitude and the actual amplitude according to a preset time interval.
A third aspect of an embodiment of the present application discloses an electronic device, including: a processor, a memory, a communication interface, and a bus;
the processor, the memory and the communication interface are connected through the bus and complete communication with each other;
the memory stores executable program code;
the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to execute a bus voltage adjusting method disclosed in the first aspect of the embodiment of the present application.
Accordingly, the present application provides a storage medium, where the storage medium is used to store an application program, and the application program is used to execute, when running, a method for adjusting a bus voltage disclosed in the first aspect of the embodiment of the present application.
Accordingly, the application program is provided, wherein the application program is used for executing the bus voltage adjusting method disclosed in the first aspect of the embodiment of the application program when running.
Firstly, acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system, wherein the first reference amplitude is determined by carrying out maximum power point tracking on the photovoltaic energy storage system; and then adjusting the bus voltage according to the first reference amplitude and the actual amplitude. The bus voltage can be dynamically regulated, so that the regulating range of the photovoltaic input voltage is widened, and the high-voltage loss on the bus and the negative influence caused by high voltage and high temperature are avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art photovoltaic energy storage system;
fig. 2 is a schematic structural diagram of a first method for adjusting a bus voltage according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a second method for adjusting a bus voltage according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a third method for adjusting a bus voltage according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a fourth method for adjusting a bus voltage according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a fifth method for regulating a bus voltage according to an embodiment of the present application;
fig. 7 is a logic schematic diagram of practical use of a method for adjusting a bus voltage according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a bus voltage regulator according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a photovoltaic energy storage system in the prior art. As shown, the system includes: the photovoltaic panel, the photovoltaic direct current controller, the battery direct current controller and the inverter. Among them, a photovoltaic panel is a photoelectric conversion device that generates direct current upon exposure to sunlight. The photovoltaic direct current controller is used for adjusting the output voltage of the photovoltaic panel so as to realize the maximum power point tracking (Maximum Power Point Tracking, MPPT) of the system, wherein the MPPT technology is a technology commonly used in a photovoltaic energy storage system and has the function of tracking the maximum power point of the system so as to ensure the maximum output power of the system under various conditions. The battery direct current controller is used for stabilizing the bus voltage, wherein the battery is used for supplying power to the battery direct current controller. The inverter is used for acquiring energy through bus voltage and inverting the acquired energy into three-phase power so as to supply power for a load. In the system, on one hand, the minimum amplitude of the bus voltage is related to the three-phase voltage output by the inverter, and when the bus voltage is lower than the minimum amplitude, the inverter cannot normally output the three-phase voltage to supply power for a load. On the other hand, the photovoltaic direct current controller is a boost circuit, so the bus voltage must be greater than or equal to the photovoltaic input voltage, which requires that the output voltage of the photovoltaic panel must be less than the bus voltage, and also results in that the adjustment of the reference amplitude of the MPPT photovoltaic input voltage is limited by the bus voltage, i.e. the amplitude range of the photovoltaic input voltage of the system is limited. Dynamic regulation of the busbar voltage is therefore required to widen the amplitude range of the photovoltaic input voltage. Based on the above system, the embodiments of the present application provide the following method for adjusting bus voltage.
Referring to fig. 2, fig. 2 is a flow chart of a first method for adjusting a bus voltage according to an embodiment of the present application. As shown in the figure, the method in the embodiment of the application includes:
s201, acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system.
In the specific implementation, the photovoltaic energy storage system can supply power for loads such as industrial production equipment and household appliances. The system inverts the output voltage of the photovoltaic panel into three-phase power through the inverter to supply power to the load. The first reference amplitude is determined by maximum power point tracking of the photovoltaic energy storage system. The maximum power point tracking can be performed on the photovoltaic energy storage system by utilizing the MPPT technology to determine a reference amplitude of the photovoltaic input voltage (photovoltaic panel output voltage), and the photovoltaic input voltage is regulated in a voltage direction of the maximum power point in a certain step size by regulating the reference amplitude of the photovoltaic input voltage. Such as: the maximum power reference point is (100V, 20A), which indicates that the system outputs maximum power when the voltage is 100V (V) and the current is 20A, if the photovoltaic input voltage is actually 60V (V) at this time, the MPPT technology continuously raises the reference amplitude of the photovoltaic input voltage until the photovoltaic input voltage reaches 100V, and when the photovoltaic input voltage is greater than 100V, the MPPT technology lowers the reference amplitude of the photovoltaic input voltage until the photovoltaic input voltage reaches 100V. The current actual magnitude of the bus voltage may be obtained by sampling the instantaneous voltage on the bus.
In order to prevent the system from being unstable due to the fact that the bus voltage adjusting frequency is too high, a reference amplitude of the photovoltaic input voltage and an actual amplitude of the bus voltage in the photovoltaic energy storage system can be obtained according to a preset time interval, so that the bus voltage can be adjusted. The preset time interval may be any duration of 20 seconds(s), 30s, etc.
S202, adjusting the bus voltage according to the first reference amplitude and the actual amplitude.
In a specific implementation, a difference between an actual amplitude of the bus voltage and a first reference amplitude of the photovoltaic input voltage may be calculated first, where the difference = the actual amplitude of the bus voltage-the first reference amplitude; and then determining a reference amplitude of the bus voltage according to the difference value, and adjusting the bus voltage by taking the reference amplitude of the bus voltage as a basis. Wherein the reference amplitude of the bus voltage may be determined, but is not limited to, according to the interval to which the difference belongs.
For example: the actual amplitude of the bus voltage is 32v, the reference amplitude of the photovoltaic input voltage is 20v, and the difference between them is 12v, since 12v belongs to [10,20], the reference amplitude of the bus voltage can be taken as the sum of the actual amplitude and the difference, namely 44v. The bus voltage was then adjusted from the original 32v to 44v.
In the embodiment of the application, first, a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system are obtained, wherein the first reference amplitude is determined by carrying out maximum power point tracking on the photovoltaic energy storage system; the bus voltage is then adjusted based on the first reference magnitude and the actual magnitude. Dynamic adjustment of bus voltage is achieved, and therefore the adjustment range of photovoltaic input voltage is widened.
Referring to fig. 3, fig. 3 is a flow chart of a second method for adjusting a bus voltage according to an embodiment of the present application. As shown in the figure, the method in the embodiment of the application includes:
s301, acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system. The step is the same as step S201 in the previous embodiment, and the description of this step is omitted.
S302, judging whether the difference value between the actual amplitude and the first reference amplitude is smaller than a first threshold value. If yes, S303 is executed, and if no, the process ends.
In a specific implementation, a difference between an actual amplitude of the bus voltage and a first reference amplitude of the photovoltaic input voltage may be calculated first, where the difference = the actual amplitude of the bus voltage-the first reference amplitude; the difference is then compared to a first threshold. Wherein the first threshold may be 10v, 15v, etc. If the difference is not smaller than the first threshold, the bus voltage does not need to be regulated, and the process is ended. If the difference is less than the first threshold, S303 is performed to adjust the bus voltage.
S303, taking the sum of the actual amplitude and the first preset voltage amplitude as a second reference amplitude of the bus voltage.
In a specific implementation, when the difference between the actual amplitude and the first reference amplitude is smaller than the first threshold, it is indicated that the MPPT technique may be limited by an upper limit when adjusting the reference amplitude of the photovoltaic input voltage upward. Since the upper limit value of the photovoltaic input voltage is the bus voltage, it is necessary to increase the bus voltage. Wherein, the sum of the actual amplitude of the bus voltage and the first preset voltage amplitude can be used as the second reference amplitude of the bus voltage, and the first preset voltage amplitude can be 10v, 20v and the like.
S304, adjusting the bus voltage according to the second reference amplitude.
In a specific implementation, the bus voltage may be adjusted from the actual amplitude to a second reference amplitude.
For example: the actual amplitude of the bus voltage is 28v, the reference amplitude of the photovoltaic input voltage is 20v, and the difference between the actual amplitude and the reference amplitude is 8v, wherein the sum 38v of the actual amplitude 28v and the preset voltage amplitude 10v is taken as the reference amplitude of the bus voltage because the 8v is smaller than the first threshold value 10 v. The bus voltage is then adjusted from the original 28v to the reference amplitude 38v.
In the embodiment of the application, first, a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system are obtained, wherein the first reference amplitude is determined by carrying out maximum power point tracking on the photovoltaic energy storage system; and then taking the sum of the actual amplitude and the preset voltage amplitude as a second reference amplitude of the bus voltage when the difference value between the first reference amplitude and the actual amplitude is smaller than a first threshold value, and regulating the bus voltage according to the second reference amplitude. The dynamic adjustment of the bus voltage can be realized, the problem that tracking of the maximum power point cannot be continuously carried out due to the fact that the amplitude of the bus voltage is lower than the reference amplitude of the photovoltaic input voltage is avoided, and the adjustment range of the photovoltaic input voltage is widened.
Referring to fig. 4, fig. 4 is a flow chart of a third method for adjusting a bus voltage according to an embodiment of the present application. As shown in the figure, the method in the embodiment of the application includes:
s401, acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system. The step is the same as step S201 in the foregoing embodiment, and the description of this step is omitted.
S402, judging whether the difference value between the actual amplitude and the first reference amplitude is smaller than a first threshold value. If yes, executing S403; if not, ending. The step is the same as S302 in the previous embodiment, and the description of this step is omitted.
S403, taking the sum of the actual amplitude and the first preset voltage amplitude as a second reference amplitude of the busbar voltage. The step is the same as S303 in the previous embodiment, and the description of this step is omitted.
S404, determining the maximum amplitude of the bus voltage.
In a specific implementation, in order to ensure the safety of elements in the photovoltaic energy storage system, the busbar voltage cannot be increased without limitation. Therefore, the maximum amplitude of the bus voltage can be determined according to the withstand voltage value of the bus capacitor in the photovoltaic energy storage system, wherein the bus capacitor can be a direct current bus capacitor in the inverter. The withstand voltage value of the bus capacitor is the highest voltage that the bus capacitor can bear for a long time, and the maximum amplitude of the bus voltage can be equal to the withstand voltage value of the bus capacitor, such as 50v.
And S405, adjusting the bus voltage according to the maximum amplitude and the second reference amplitude.
In specific implementation, the second reference amplitude is compared with the maximum amplitude, whether the second reference amplitude of the bus voltage is larger than the maximum amplitude is judged, and if the second reference amplitude is not larger than the maximum amplitude, the bus voltage is regulated from the actual amplitude to the second reference amplitude; and if the reference amplitude is larger than the maximum amplitude, regulating the bus voltage from the actual amplitude to the maximum amplitude.
For example: the actual amplitude of the bus voltage is 28v, the reference amplitude of the photovoltaic input voltage is 20v, and the difference between the actual amplitude and the reference amplitude is 8v, wherein the sum 38v of the actual amplitude 28v and the preset voltage amplitude 10v is taken as the reference amplitude of the bus voltage because the 8v is smaller than the first threshold value 10 v. The reference amplitude 38v of the bus voltage is then compared to the maximum amplitude 50v, since 38v is less than 50v, and the bus voltage is then adjusted from the original 28v to 38v.
In the embodiment of the application, first, a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system are obtained, wherein the first reference amplitude is determined by carrying out maximum power point tracking on the photovoltaic energy storage system; and then taking the sum of the actual amplitude and the preset voltage amplitude as a second reference amplitude of the bus voltage when the difference value between the first reference amplitude and the actual amplitude is smaller than a first threshold value, and regulating the bus voltage according to the second reference amplitude. The dynamic adjustment of the bus voltage can be realized, the problem that the maximum power point tracking cannot be continuously carried out due to the fact that the amplitude of the bus voltage is lower than the reference amplitude of the photovoltaic input voltage is avoided, and the adjustment range of the photovoltaic input voltage is widened. Meanwhile, an upper regulation limit is set in the process of regulating the bus voltage, so that the safety of circuit elements in the photovoltaic energy storage system is ensured.
Referring to fig. 5, fig. 5 is a flowchart of a fourth method for adjusting a bus voltage according to an embodiment of the present application. As shown in the figure, the method in the embodiment of the application includes:
s501, acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system. The step is the same as S201 in the foregoing embodiment, and the description of this step is omitted.
S502, judging whether the difference value between the actual amplitude and the first reference amplitude is larger than a second threshold value. If yes, executing S503; if not, ending.
In a specific implementation, a difference between an actual amplitude of the bus voltage and a first reference amplitude of the photovoltaic input voltage may be calculated first, where the difference = the actual amplitude of the bus voltage-the first reference amplitude; the difference is then compared to a second threshold. The second threshold may be any value such as 20 v. If the difference is not greater than the second threshold, it is indicated that the bus voltage does not need to be adjusted, and the process is ended. If the difference is greater than the second threshold, S503 is performed to adjust the bus voltage.
S503, taking the difference between the actual amplitude and a second preset voltage amplitude as a second reference amplitude of the bus voltage.
In a specific implementation, when the difference value between the actual amplitude of the bus voltage and the first reference amplitude of the photovoltaic input voltage is greater than the second threshold value, the risk that the maximum power point tracking cannot be continued does not exist. At this time, if the bus voltage continues to maintain the high voltage state, heat is generated due to the high voltage, and thus unnecessary power loss is caused. And therefore requires proper voltage regulation of the bus. The difference between the actual amplitude of the bus voltage and the second preset voltage amplitude can be used as the reference amplitude of the bus voltage, and the second preset voltage amplitude can be any value such as 10 v.
S504, adjusting the bus voltage according to the second reference amplitude.
In a specific implementation, the bus voltage may be adjusted from the actual amplitude to a second reference amplitude.
For example: the actual amplitude of the bus voltage is 38v, the reference amplitude of the photovoltaic input voltage is 15v, and the difference between the actual amplitude and the reference amplitude is 23v, wherein the difference 28v between the actual amplitude 38v and the preset voltage amplitude 10v is taken as the reference amplitude of the bus voltage because the 23v is larger than the second threshold 20 v. The bus voltage is then adjusted from 38v to 28v.
In the embodiment of the application, first, a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system are obtained, wherein the first reference amplitude is determined by carrying out maximum power point tracking on the photovoltaic energy storage system; and then when the difference value between the first reference amplitude and the actual amplitude is larger than a second threshold value, taking the difference between the actual amplitude and the preset voltage amplitude as a second reference amplitude of the bus voltage, and adjusting the bus voltage according to the second reference amplitude. The dynamic adjustment of the bus voltage is realized, the adjustment range of the photovoltaic input voltage can be widened, and the high-voltage loss on the bus and the negative influence caused by high voltage and high temperature can be eliminated.
Referring to fig. 6, fig. 6 is a flowchart of a fifth method for adjusting a bus voltage according to an embodiment of the present application. As shown in the figure, the method in the embodiment of the application includes:
s601, acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system. The step is the same as S201 in the foregoing embodiment, and the description of this step is omitted.
S602, judging whether the difference value between the actual amplitude and the first reference amplitude is larger than a second threshold value. If yes, executing S603; if not, ending. The step is the same as S502 in the previous embodiment, and the description of this step is omitted.
S603, taking the difference between the actual amplitude and a second preset voltage amplitude as a second reference amplitude of the busbar voltage. This step is the same as S503 in the previous embodiment, and is not repeated.
S604, determining the minimum amplitude of the bus voltage.
In a specific implementation, in order to ensure the normal operation of the photovoltaic energy storage system, the minimum amplitude of the bus voltage may be determined according to the amplitude of the three-phase voltage output by the inverter in the photovoltaic energy storage system, for example, if the amplitude of the three-phase voltage output by the inverter is u, the minimum amplitude of the bus voltage may be determined as
When the amplitude of the bus voltage is lower than the minimum amplitude, the inverter cannot normally output three-phase voltage to supply power for the load.
And S605, adjusting the bus voltage according to the minimum amplitude and the second reference amplitude.
In specific implementation, the second reference amplitude of the bus voltage can be compared with the minimum amplitude, whether the second reference amplitude is smaller than the minimum amplitude is judged, and if the second reference amplitude is not smaller than the minimum amplitude, the bus voltage is regulated from the actual amplitude to the second reference amplitude; and if the second reference amplitude is smaller than the minimum amplitude, regulating the bus voltage from the actual amplitude to the minimum amplitude.
For example: the actual amplitude of the bus voltage is 38v, the reference amplitude of the photovoltaic input voltage is 15v, and the difference between the actual amplitude and the reference amplitude is 23v, wherein the difference 28v between the actual amplitude 38v and the preset voltage amplitude 10v is taken as the reference amplitude of the bus voltage because the 23v is larger than the second threshold value 20 v. The reference amplitude 28v of the bus voltage is then compared to the minimum amplitude 30v, since 28v is less than 30v, and the bus voltage is then adjusted from the original 38v to the minimum amplitude 30v.
In the embodiment of the application, first, a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system are obtained, wherein the first reference amplitude is determined by carrying out maximum power point tracking on the photovoltaic energy storage system; and then when the difference value between the first reference amplitude and the actual amplitude is larger than a second threshold value, taking the difference between the actual amplitude and the preset voltage amplitude as the reference amplitude of the bus voltage, and regulating the bus voltage according to the reference amplitude of the bus voltage. The dynamic adjustment of the bus voltage is realized, the adjustment range of the photovoltaic input voltage can be widened, the high-voltage loss on the bus and the negative influence caused by high voltage and high temperature can be eliminated, and meanwhile, the adjustment lower limit is set in the adjustment process of the bus voltage, so that the normal operation of the photovoltaic energy storage system is ensured.
In summary, the above 5 embodiments are described below by way of an example of a method for adjusting the bus voltage provided in the present application.
For example: as shown in FIG. 7, u bus ,u pref ,u busmax ,u busmin ,u busref The method comprises the steps of respectively representing the actual amplitude of bus voltage, the reference amplitude of photovoltaic input voltage, the maximum amplitude of bus voltage, the minimum amplitude of bus voltage and the reference amplitude of bus voltage, which are determined by MPPT technology. Assuming that the bus voltage is adjusted once every 20s, the current bus voltage adjustment operation is started when the 20 second delay is completed from the end of the previous bus voltage adjustment operation. First, the current u is obtained bus And a reference amplitude u of the photovoltaic input voltage determined using MPPT technique pref Wherein the bus voltage is generally the current u bus The voltage amplitude is equal to the bus voltage after last adjustment. Next, 3 cases were included: (1) If u bus -u pref Less than 10, then calculate u busref ＝u bus +10, and further determining u busref Whether or not it is greater than u busmax When u busref >u busmax When the bus voltage is regulated to u busmax Otherwise, the bus voltage is regulated to u busref . (2) If u bus -u pref If the value is more than or equal to 20, calculating u busref ＝u bus -10, and further determining u busref Whether or not it is smaller than u busmin When u busref ≥u busmin When the bus voltage is regulated to u busref Otherwise, the bus voltage is regulated to u busmin . (3) If u bus -u pref And if the voltage is not smaller than 10 and not larger than 20, the bus voltage is not required to be regulated, and the regulating operation is finished.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a bus voltage regulator according to an embodiment of the present application. As shown in the figure, the device in the embodiment of the present application includes:
the obtaining module 801 is configured to obtain a first reference amplitude of a photovoltaic input voltage and an actual amplitude of a bus voltage in a photovoltaic energy storage system, where the first reference amplitude is determined by performing maximum power point tracking on the photovoltaic energy storage system.
In a specific implementation, the maximum power point tracking can be performed on the photovoltaic energy storage system according to the MPPT technology so as to determine the reference amplitude of the photovoltaic input voltage in the photovoltaic energy storage system. And the actual amplitude of the current bus voltage can be obtained through sampling.
In order to prevent unstable system caused by too high bus voltage regulation frequency, the reference amplitude of the photovoltaic input voltage and the actual amplitude of the bus voltage in the photovoltaic energy storage system can be obtained according to a preset time interval so as to regulate the bus voltage. The preset time interval may be any duration of 20s, 30s, etc.
An adjustment module 802 for adjusting the bus voltage according to a first reference amplitude and the actual amplitude.
In a specific implementation, a difference between an actual amplitude of the bus voltage and a first reference amplitude of the photovoltaic input voltage may be calculated first, where the difference = the actual amplitude of the bus voltage-the first reference amplitude; it is then determined whether the difference is less than a first threshold. Wherein the first threshold may be 10v or the like. When the difference is smaller than the first threshold, the MPPT technique may be limited to upwardly adjust the reference amplitude of the photovoltaic input voltage, and since the upper limit of the photovoltaic input voltage is the bus voltage, the bus voltage may be increased, wherein the sum of the actual amplitude of the bus voltage and the first preset voltage amplitude may be used as the reference amplitude of the bus voltage, and the first preset voltage amplitude may be 10v, 20v, or the like. And then adjusting the bus voltage according to the reference amplitude of the bus voltage, wherein the bus voltage can be directly increased from the actual amplitude to the reference amplitude.
Alternatively, the bus voltage cannot be increased without limitation in order to ensure the safety of all the elements of the system. Therefore, the maximum amplitude of the bus voltage can be determined according to the withstand voltage value of the bus capacitor in the photovoltaic energy storage system, wherein the bus capacitor is included in the inverter, the withstand voltage value of the bus capacitor is the highest voltage that can be born by the bus capacitor for a long time, and the maximum amplitude of the bus voltage can be equal to the withstand voltage value of the bus capacitor, such as 280v, 300v, and the like; then determining whether the reference amplitude of the bus voltage is larger than the maximum amplitude, and adjusting the bus voltage from the actual amplitude to the reference amplitude when the reference amplitude of the bus voltage is not larger than the maximum amplitude; when the reference amplitude is greater than the maximum amplitude, the bus voltage is adjusted from the actual amplitude to the maximum amplitude.
Optionally, when the difference between the actual amplitude of the bus voltage and the reference amplitude of the photovoltaic input voltage is greater than the second threshold, the difference between the actual amplitude and the second preset voltage amplitude is used as the reference amplitude of the bus voltage.
In a specific implementation, the second threshold may be any value such as 20 v. When the difference between the actual amplitude of the busbar voltage and the reference amplitude of the photovoltaic input voltage is greater than the second threshold value, there is no risk that the maximum power point tracking cannot be continued. Therefore, the bus voltage may be moderately reduced at this time to reduce the electric energy lost due to the heat generation caused by the excessive bus voltage, wherein a difference between the actual magnitude of the bus voltage and the second preset voltage magnitude may be taken as the reference magnitude of the bus voltage, the second preset voltage magnitude may be 10v, and so on.
Then, the bus voltage is adjusted according to the reference amplitude of the bus voltage. Wherein the bus voltage can be directly reduced from the actual amplitude to the reference amplitude.
Optionally, in order to ensure the normal operation of the system, the minimum amplitude of the bus voltage may be determined according to the output voltage of the inverter in the photovoltaic energy storage system. When the reference amplitude of the bus voltage is lower than the minimum amplitude, the inverter cannot normally output the three-phase voltage. Then determining whether the reference amplitude of the bus voltage is smaller than the minimum amplitude of the bus voltage, and reducing the bus voltage from the actual amplitude to the reference amplitude when the reference amplitude is not smaller than the minimum amplitude; and when the reference amplitude is smaller than the minimum amplitude, reducing the bus voltage from the actual amplitude to the minimum amplitude.
In the embodiment of the application, first, a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system are obtained, wherein the first reference amplitude is determined by carrying out maximum power point tracking on the photovoltaic energy storage system; the bus voltage is then adjusted based on the first reference magnitude and the actual magnitude. The bus voltage can be dynamically regulated, so that the regulating range of the photovoltaic input voltage is widened, and the high-voltage loss on the bus and the negative influence caused by high voltage and high temperature are avoided.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown, the electronic device may include: at least one processor 901, such as a CPU, at least one communication interface 902, at least one memory 903, and at least one bus 904. Wherein bus 904 is used to enable connected communications between these components. The communication interface 902 of the electronic device in the embodiment of the present application is a wired transmission port, and may also be a wireless device, for example, including an antenna device, for performing signaling or data communication with other node devices. The memory 903 may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 903 may also optionally be at least one storage device located remotely from the processor 901. The memory 903 stores a set of program codes, and the processor 901 is configured to call the program codes stored in the memory for performing the following operations:
acquiring a first reference amplitude of a photovoltaic input voltage and an actual amplitude of a bus voltage in a photovoltaic energy storage system, wherein the first reference amplitude is determined by tracking a maximum power point of the photovoltaic energy storage system;
and adjusting the bus voltage according to the first reference amplitude and the actual amplitude.
The processor 901 is further configured to perform the following operation steps:
calculating a difference between the actual amplitude and the first reference amplitude;
and adjusting the bus voltage according to the difference value.
The processor 901 is further configured to perform the following operation steps:
determining a second reference amplitude of the bus voltage according to the difference value;
and adjusting the bus voltage according to the second reference amplitude.
The processor 901 is further configured to perform the following operation steps:
and when the difference value is smaller than a first threshold value, taking the sum of the actual amplitude value and a first preset voltage amplitude value as the second reference amplitude value.
The processor 901 is further configured to perform the following operation steps:
determining the maximum amplitude of the bus voltage according to the withstand voltage value of the bus capacitor in the photovoltaic energy storage system;
judging whether the second reference amplitude is larger than the maximum amplitude; if the second reference amplitude is not greater than the maximum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is larger than the maximum amplitude, regulating the amplitude of the bus voltage to the maximum amplitude.
The processor 901 is further configured to perform the following operation steps:
and when the difference value is larger than a second threshold value, taking the difference between the actual amplitude value and a second preset voltage amplitude value as the second reference amplitude value.
The processor 901 is further configured to perform the following operation steps:
determining the minimum amplitude of the bus voltage according to the output voltage of the inverter in the photovoltaic energy storage system;
judging whether the second reference amplitude is smaller than the minimum amplitude; if the second reference amplitude is not smaller than the minimum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is smaller than the minimum amplitude, regulating the amplitude of the bus voltage to the minimum amplitude.
The processor 901 is further configured to perform the following operation steps:
and acquiring the first reference amplitude and the actual amplitude according to a preset time interval.
The processor 901 is further configured to perform the following operation steps:
the first reference amplitude of the photovoltaic input voltage is determined according to a maximum power point tracking technique.
It should be noted that, the embodiment of the present application also provides a storage medium for storing an application program, where the application program is used to execute, at runtime, an operation executed by an electronic device in a method for adjusting a bus voltage shown in fig. 2, 3, 4, 5, and 6.
It should be noted that the embodiment of the present application also provides an application program for executing, at the time of operation, the operations executed by the electronic device in the method for adjusting the bus voltage shown in fig. 2, 3, 4, 5 and 6.
It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the described order of action, as some steps may take other order or be performed simultaneously according to the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: flash disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
The foregoing has described in detail the methods, devices and systems for downloading content provided by the embodiments of the present application, and specific examples have been applied to illustrate the principles and embodiments of the present application, where the foregoing examples are provided to assist in understanding the methods and core ideas of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (10)
1. A method of regulating bus voltage, the method comprising:
acquiring a first reference amplitude of photovoltaic input voltage and an actual amplitude of bus voltage in a photovoltaic energy storage system, wherein the first reference amplitude is determined by tracking a maximum power point of the photovoltaic energy storage system;
judging whether the difference value between the actual amplitude and the first reference amplitude is smaller than a first threshold value or whether the difference value between the actual amplitude and the first reference amplitude is larger than a second threshold value, wherein the second threshold value is larger than the first threshold value;
if the difference value between the actual amplitude and the first reference amplitude is smaller than the first threshold value, taking the sum of the actual amplitude and a first preset voltage amplitude as a second reference amplitude of the bus voltage, or if the difference value between the actual amplitude and the first reference amplitude is larger than the second threshold value, taking the difference between the actual amplitude and a second preset voltage amplitude as the second reference amplitude, and adjusting the bus voltage according to the second reference amplitude;
and if the difference value between the actual amplitude and the first reference amplitude is not smaller than the first threshold value and is not larger than the second threshold value, determining that the bus voltage is not regulated.
2. The method of claim 1, wherein said adjusting said bus voltage according to said second reference amplitude comprises:
determining the maximum amplitude of the bus voltage according to the withstand voltage value of the bus capacitor in the photovoltaic energy storage system;
judging whether the second reference amplitude is larger than the maximum amplitude; if the second reference amplitude is not greater than the maximum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is larger than the maximum amplitude, regulating the amplitude of the bus voltage to the maximum amplitude.
3. The method of claim 1, wherein said adjusting said bus voltage according to said second reference amplitude comprises:
determining the minimum amplitude of the bus voltage according to the output voltage of the inverter in the photovoltaic energy storage system;
judging whether the second reference amplitude is smaller than the minimum amplitude; if the second reference amplitude is not smaller than the minimum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is smaller than the minimum amplitude, regulating the amplitude of the bus voltage to the minimum amplitude.
4. The method of claim 1-3, wherein obtaining the first reference magnitude of the photovoltaic input voltage and the actual magnitude of the bus voltage in the photovoltaic energy storage system comprises:
and acquiring the first reference amplitude and the actual amplitude according to a preset time interval.
5. A bus voltage regulating device for performing the bus voltage regulating method according to any one of claims 1-4, characterized in that the device comprises:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first reference amplitude of a photovoltaic input voltage and an actual amplitude of a bus voltage in a photovoltaic energy storage system, and the first reference amplitude is determined by tracking a maximum power point of the photovoltaic energy storage system;
the adjusting module is used for judging whether the difference value between the actual amplitude and the first reference amplitude is smaller than a first threshold value or whether the difference value between the actual amplitude and the first reference amplitude is larger than a second threshold value, and the second threshold value is larger than the first threshold value; if the difference value between the actual amplitude and the first reference amplitude is smaller than the first threshold value, taking the sum of the actual amplitude and the first preset voltage amplitude as a second reference amplitude of the bus voltage, or if the difference value between the actual amplitude and the first reference amplitude is larger than the second threshold value, taking the difference between the actual amplitude and the second preset voltage amplitude as the second reference amplitude, and adjusting the bus voltage according to the second reference amplitude; and if the difference value between the actual amplitude and the first reference amplitude is not smaller than the first threshold value and is not larger than the second threshold value, determining that the bus voltage is not regulated.
6. The bus voltage regulating device of claim 5, wherein the regulating module is further configured to:
determining the maximum amplitude of the bus voltage according to the withstand voltage value of the bus capacitor in the photovoltaic energy storage system;
judging whether the second reference amplitude is larger than the maximum amplitude; if the second reference amplitude is not greater than the maximum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is larger than the maximum amplitude, regulating the amplitude of the bus voltage to the maximum amplitude.
7. The bus voltage regulating device of claim 5, wherein the regulating module is further configured to:
determining the minimum amplitude of the bus voltage according to the output voltage of the inverter in the photovoltaic energy storage system;
judging whether the second reference amplitude is smaller than the minimum amplitude; if the second reference amplitude is not smaller than the minimum amplitude, adjusting the amplitude of the bus voltage to the second reference amplitude; and if the second reference amplitude is smaller than the minimum amplitude, regulating the amplitude of the bus voltage to the minimum amplitude.
8. The bus voltage adjustment device of any one of claims 5-7, wherein the acquisition module is further configured to:
and acquiring the first reference amplitude and the actual amplitude according to a preset time interval.
9. An electronic device, comprising: a processor, a memory, a communication interface, and a bus;
the processor, the memory and the communication interface are connected through the bus and complete communication with each other;
the memory stores executable program code;
the processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory for performing the bus voltage adjusting method according to any one of claims 1 to 4.
10. A computer readable storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform the method of regulating the bus voltage according to any of claims 1-4.
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| PCT/CN2019/070771 WO2020142890A1 (en) | 2019-01-08 | 2019-01-08 | Method for adjusting bus voltage, and related device |
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| CN103560656B (en) * | 2013-11-06 | 2016-09-14 | 西安龙腾新能源科技发展有限公司 | The method reducing single-phase photovoltaic grid-connected inverter output current harmonics |
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| CN104104112B (en) * | 2014-08-08 | 2016-08-24 | 深圳市创皓科技有限公司 | MPPT control method for the photovoltaic combining inverter of two-stage topologies |
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