CN109546854A - Converter system compatible with different loads, control method thereof and power grid - Google Patents
Converter system compatible with different loads, control method thereof and power grid Download PDFInfo
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- CN109546854A CN109546854A CN201811467511.9A CN201811467511A CN109546854A CN 109546854 A CN109546854 A CN 109546854A CN 201811467511 A CN201811467511 A CN 201811467511A CN 109546854 A CN109546854 A CN 109546854A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 100
- 238000004146 energy storage Methods 0.000 claims description 66
- 230000001276 controlling effect Effects 0.000 claims description 38
- 230000003993 interaction Effects 0.000 claims description 20
- 238000012544 monitoring process Methods 0.000 claims description 18
- 238000010248 power generation Methods 0.000 claims description 10
- 238000011217 control strategy Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
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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
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a converter system compatible with different loads, a control method thereof and a power grid, wherein the system comprises: a power supply for supplying power to a load; the power converter is positioned between a power supply and a load and comprises two paths of conversion circuits: the first conversion circuit is used for converting a power supply into alternating current output; and a second conversion circuit for converting the power supply to a dc output; the control switching device is positioned between the power supply and the power supply converter and used for controlling the system to be switched to a conversion circuit corresponding to the type of the load; the load is a direct current load and/or an alternating current load. The converter system solves the problem that the converter is incompatible with different types of loads in the prior art, and improves the compatibility and intelligence of the converter system.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a converter system compatible with different loads, a control method of the converter system and a power grid.
Background
In actual life, energy generated by photovoltaic power generation cannot be directly applied, and a converter is often needed to adjust the photovoltaic power. In life, various loads exist, and the loads can be divided into direct current loads and alternating current loads according to different power supply modes. The current converter has the defects that most of the loads of the current converter are single-type loads, all the loads are alternating current loads or direct current loads, the current converter cannot be universally used for various different types of loads, when the loads comprise various types of loads, the current converter cannot be used or needs a plurality of current converters, and the intelligence degree of the current converter is not enough.
In order to solve the problem that the converter is not compatible with different types of loads in the related art, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a converter system compatible with different loads, a control method thereof and a power grid, and aims to at least solve the problem that a converter is incompatible with different types of loads in the prior art.
To solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a converter system compatible with different loads, including: a power supply for supplying power to a load; the power converter is positioned between a power supply and a load and comprises two paths of conversion circuits: the first conversion circuit is used for converting a power supply into alternating current output; and a second conversion circuit for converting the power supply to a dc output; the control switching device is positioned between the power supply and the power supply converter and used for controlling the system to be switched to a conversion circuit corresponding to the type of the load; the load is a direct current load and/or an alternating current load.
Further, the power supply is a dc power supply, and the dc power supply at least includes one of the following: photovoltaic power generation device, wind power generation set.
Further, the control switching device includes: the switching circuit is positioned between the power supply and the power supply converter and is used for connecting the power supply and the first conversion circuit and/or connecting the power supply and the second conversion circuit; and the controller is connected with the switching circuit and is used for controlling the system to be switched to the conversion circuit corresponding to the type of the load through the switching circuit.
Further, the switching circuit includes: the first switching circuit is positioned between the power supply and the first conversion circuit and is used for closing when the load comprises an alternating current load so as to supply power to the alternating current load through the power supply; and the second switching circuit is positioned between the power supply and the second conversion circuit and is used for closing when the load comprises the direct current load so as to supply power to the direct current load through the power supply.
Further, still include: a grid system; the power grid system comprises: and the power grid is positioned between the first conversion circuit and the load and is used for receiving the alternating current output of the first conversion circuit or supplying power to the alternating current load when the load comprises the alternating current load.
Further, the power grid system further comprises: the third switching circuit is positioned between the first conversion circuit and the power grid and is used for closing when the output power of the power supply is greater than the consumed power of the load so as to merge redundant electric energy of the power supply into the power grid except for the consumed power of the load; and the fourth switching circuit is positioned between the power grid and the load and used for closing to supply power for the alternating current load through the power grid when the load comprises the alternating current load and the output power of the power supply is less than the consumed power of the load.
Further, still include: an energy storage system; the energy storage system includes: and the energy storage device is positioned between the second conversion circuit and the load and is used for receiving and storing the direct current output of the second conversion circuit or supplying power to the direct current load when the load comprises the direct current load.
Further, the energy storage system further comprises: the fifth switching circuit is positioned between the second conversion circuit and the energy storage device and is used for being closed when the output power of the power supply is larger than the consumed power of the load so as to store the redundant electric energy of the power supply except the consumed power of the load; and the sixth switching circuit is positioned between the energy storage device and the load and used for closing when the load comprises a direct current load and the output power of the power supply is less than the consumed power of the load so as to supply power for the direct current load through the energy storage device.
Further, still include: and the seventh switching circuit is positioned between the energy storage device and the power grid and used for controlling the power grid to charge the energy storage device.
Further, still include: and the input end of the output control device is connected with the power grid, the energy storage device and the power converter, and the output end of the output control device is connected with the load and used for regulating the electric energy input by the power grid and/or the energy storage device and/or the power converter so as to supply power to the load.
Further, the output control device includes: the control device and the load access device are sequentially connected; the control device is used for adjusting the electric energy input by the power grid and/or the energy storage device and/or the power converter; and the load access device is used for supplying the electric energy regulated by the control device to the load so as to supply power to the load.
Further, the control device includes: and one end of the voltage adjusting module is connected with the input end of the control device, and the other end of the voltage adjusting module is connected with the load access device and used for adjusting the voltage of the input electric energy so as to adapt to the voltage of the load.
Further, the control device further includes: one end of the output monitoring module is connected with the input end of the control device, and the other end of the output monitoring module is connected with the load access device and used for monitoring the output parameters of the output control device in real time; and one end of the indicating module is connected with the input end of the control device, and the other end of the indicating module is connected with the load access device and used for displaying the working condition of the output control device.
Further, still include: and the human-computer interaction device is connected with the output monitoring module and used for receiving the output parameters monitored by the output monitoring module, displaying the output parameters to a user and receiving control parameters input by the user.
Further, the human-computer interaction device is also connected with the controller and used for determining the type of the load and sending the type of the load to the controller.
Further, the human-computer interaction interface determines the type of the load by receiving the load parameter input by the user, or by providing the user with an option of the type of the load and recognizing the option selected by the user.
Further, still include: and the filtering device is positioned between the power supply and the control switching device and is used for filtering the output of the power supply.
According to another aspect of the embodiments of the present invention, there is provided a control method of a converter system compatible with different loads, which is applied to the system described above, and includes: determining the type of a load, and determining a corresponding power conversion circuit according to the type of the load; the load is a direct current load and/or an alternating current load; the control system is switched to the power supply conversion circuit corresponding to the type of the load so as to supply power to the load through the power supply.
Further, determining the type of load includes: receiving a load parameter input by a user through a human-computer interaction device to determine the type of the load; alternatively, the user is provided with an option of the type of load and the user-selected option is identified to determine the type of load.
Further, determining a corresponding power conversion circuit according to the type of the load includes: when the type of the load only comprises an alternating current load, determining the corresponding power conversion circuit as a first conversion circuit; when the type of the load only comprises a direct current load, determining the corresponding power conversion circuit as a second conversion circuit; when the types of the loads comprise an alternating current load and a direct current load, the corresponding power conversion circuit is determined to be a first conversion circuit and a second conversion circuit.
Further, the control system switches to the power conversion circuit corresponding to the type of the load, and the power conversion circuit comprises: controlling the first switching circuit to close when the type of load comprises only an alternating current load; the first switching circuit is positioned between the power supply and the first conversion circuit; when the type of the load only comprises a direct current load, controlling the second switch circuit to be closed; the second switching circuit is positioned between the power supply and the second conversion circuit; and when the types of the loads comprise an alternating current load and a direct current load, controlling the first switch circuit and the second switch circuit to be closed.
Further, after supplying power to the load, the method further comprises the following steps: detecting output power of a power supply and consumed power of a load; when the output power of the power supply is larger than the consumed power of the load, controlling the third switch circuit to be closed so as to merge redundant electric energy of the power supply except for the consumed power of the load into the power grid, and/or controlling the fifth switch circuit to be closed so as to store the redundant electric energy of the power supply except for the consumed power of the load into the energy storage device; the third switching circuit is positioned between the first conversion circuit and the power grid; the fifth switching circuit is positioned between the second conversion circuit and the energy storage device; and when the output power of the power supply is smaller than the consumed power of the load, executing a corresponding control strategy according to the type of the load.
Further, executing a corresponding control strategy according to the type of the load, including: when the type of the load only comprises an alternating current load, controlling the fourth switching circuit to be closed so as to supply power to the alternating current load through the power grid; the fourth switching circuit is positioned between the power grid and the load; when the type of the load only comprises a direct current load, controlling the sixth switching circuit to be closed so as to supply power to the direct current load through the energy storage device; the sixth switching circuit is positioned between the energy storage device and the load; when the types of the loads comprise an alternating current load and a direct current load, the fourth switching circuit and the sixth switching circuit are controlled to be closed so as to supply the alternating current load with power through the power grid and supply the direct current load with power through the energy storage device.
Further, executing a corresponding control strategy according to the type of the load, further comprising: when the type of the load only comprises a direct current load, or the type of the load comprises an alternating current load and a direct current load, and the power supply cannot charge the energy storage device, controlling the seventh switch circuit to be closed so as to charge the energy storage device through the power grid; wherein the seventh switching circuit is located between the energy storage device and the grid.
According to a further aspect of an embodiment of the present invention, there is provided a power grid comprising a converter system compatible with different loads as described above.
According to a further aspect of the embodiments of the present invention, there is provided a computer device, including a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the control method of the converter system compatible with different loads as described above.
According to a further aspect of an embodiment of the present invention, there is provided a storage medium containing computer executable instructions for performing the control method of a converter system compatible with different loads as described above when executed by a computer processor.
According to the converter system compatible with different loads, the power supply conversion circuit is switched according to the types of the loads to provide electric energy corresponding to the types of the loads, so that the system can supply power to the loads of different types in a compatible manner, the problem that the converter is incompatible with the loads of different types in the prior art is effectively solved, and the compatibility and the intelligence of the converter system are improved.
Drawings
Fig. 1 is an alternative block diagram of a converter system compatible with different loads according to embodiment 1 of the present invention;
fig. 2 is another alternative structural block diagram of a converter system compatible with different loads according to embodiment 1 of the present invention;
fig. 3 is a block diagram of an alternative configuration of an output control apparatus according to embodiment 1 of the present invention; and
fig. 4 is an alternative flowchart of a control method of a converter system compatible with different loads according to embodiment 2 of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
In a preferred embodiment 1 of the present invention, a converter system compatible with different loads is provided. Specifically, fig. 1 shows an alternative structural block diagram of the method, and as shown in fig. 1, the system includes:
a power supply 102 for supplying power to a load 104;
the power converter 106, located between the power source 102 and the load 104, includes two-way conversion circuitry: the first conversion circuit is used for converting a power supply into alternating current output; and a second conversion circuit for converting the power supply to a dc output;
a control switching device 108, located between the power source 102 and the power converter 106, for controlling the system to switch to a conversion circuit corresponding to the type of the load; the load is a direct current load and/or an alternating current load.
In the above embodiment, a converter system compatible with different loads is provided, and a power conversion circuit is switched according to types of loads to provide electric energy corresponding to the types of the loads for the loads of different types, so that the system can supply power compatibly to the loads of different types, thereby effectively solving the problem that a converter is incompatible with the loads of different types in the prior art, and improving compatibility and intelligence of the converter system.
In the invention, the power supply is a direct current power supply, and the direct current power supply at least comprises one of the following components: photovoltaic power generation device, wind power generation set.
The following explains the converter system compatible with different loads in detail by taking a power supply as a photovoltaic power generation device as an example, and a structural block diagram of the system is shown in fig. 2.
In a preferred embodiment of the present invention, the control switching means includes: a switching circuit, located between the power supply and the power converter, for connecting the power supply to the first conversion circuit, i.e. the DC/AC converter, and/or to the second conversion circuit, i.e. the DC/DC converter; and the controller is connected with the switching circuit and is used for controlling the system to be switched to the conversion circuit corresponding to the type of the load through the switching circuit. Further, the switching circuit includes: a first switching circuit, e.g., S1 in fig. 2, between the power source and the first converting circuit, for closing to supply power to the ac load through the power source when the load includes the ac load; a second switching circuit, such as S2 in fig. 2, is located between the power supply and the second switching circuit for closing to supply power to the dc load through the power supply when the load comprises the dc load. In the above embodiments, the load including the ac load includes the following cases: the load is an alternating current load, or the load is an alternating current load and a direct current load. That is, the load includes an ac load may include two cases. Similarly, the load including the dc load includes the following cases: the load is a direct current load, or the load is an alternating current load and a direct current load.
In another preferred embodiment of the present invention, the system further comprises: a grid system; the power grid system comprises: and the power grid is positioned between the first conversion circuit and the load and is used for receiving the alternating current output of the first conversion circuit or supplying power to the alternating current load when the load comprises the alternating current load. Preferably, the power grid system further comprises: a third switching circuit S3, located between the first conversion circuit and the power grid, for closing when the output power of the power supply is greater than the consumed power of the load, so as to merge the surplus power of the power supply except for the consumed power of the load into the power grid; and a fourth switching circuit S4, located between the grid and the load, for closing to supply power to the AC load through the grid when the load comprises an AC load and the output power of the power supply is less than the consumed power of the load.
Further, still include: an energy storage system; the energy storage system includes: and the energy storage device is positioned between the second conversion circuit and the load and is used for receiving and storing the direct current output of the second conversion circuit or supplying power to the direct current load when the load comprises the direct current load. The energy storage system further includes: the fifth switching circuit is positioned between the second conversion circuit and the energy storage device and is used for being closed when the output power of the power supply is larger than the consumed power of the load so as to store the redundant electric energy of the power supply except the consumed power of the load; and the sixth switching circuit is positioned between the energy storage device and the load and used for closing when the load comprises a direct current load and the output power of the power supply is less than the consumed power of the load so as to supply power for the direct current load through the energy storage device.
In other words, in the invention, not only can the load be supplied by the power supply, but also in consideration of the situation that the load of the power supply may be insufficient to supply power to the load and the situation that the load demand is exceeded, and for the situation that the load of the power grid is insufficient to supply power to the load, other power supply forms are adopted, including the power grid (corresponding to the alternating current load) and the energy storage device (corresponding to the direct current load), so as to provide standby electric energy for different types of loads. In order to improve the energy utilization efficiency, the converter also recovers the redundant electric energy through a power grid and an energy storage device, thereby realizing the intelligent energy management of the converter.
And when the output end is unloaded, the system defaults to S1 to turn on/off S2 to charge the energy storage device, and after the charging is finished, S2 is turned off and S1 is turned on to incorporate redundant power generation into the power grid.
Optionally, the system further comprises: and the seventh switching circuit S7 is positioned between the energy storage device and the power grid and used for controlling the power grid to charge the energy storage device. When the energy storage device is low in electricity and cannot be charged by photovoltaic power generation, the controller is connected to the step S7, and the energy storage device is charged by the power grid.
S1-S7 are switching devices such as a switch tube, an analog switch or a contactor.
In a further preferred embodiment of the invention, the system further comprises: and the input end of the output control device is connected with the power grid, the energy storage device and the power converter, and the output end of the output control device is connected with the load and used for regulating the electric energy input by the power grid and/or the energy storage device and/or the power converter so as to supply power to the load. As previously mentioned, the grid and the energy storage device may provide auxiliary power when the power supply is insufficient to power the load, and therefore the output control device is connected to the input with the grid, the energy storage device and the power converter. Fig. 3 shows an alternative block diagram of the output control device.
As shown in fig. 3, the output control device includes: the control device and the load access device are sequentially connected; the control device is used for adjusting the electric energy input by the power grid and/or the energy storage device and/or the power converter; and the load access device is used for supplying the electric energy regulated by the control device to the load so as to supply power to the load. The control device includes: and one end of the voltage adjusting module is connected with the input end of the control device, and the other end of the voltage adjusting module is connected with the load access device and used for adjusting the voltage of the input electric energy so as to adapt to the voltage of the load. One end of the output monitoring module is connected with the input end of the control device, and the other end of the output monitoring module is connected with the load access device and used for monitoring the output parameters of the output control device in real time; and one end of the indicating module is connected with the input end of the control device, and the other end of the indicating module is connected with the load access device and used for displaying the working condition of the output control device. The load access is composed of a plurality of analog switches, a plurality of loads (including loads of the same type or loads of different types) can be simultaneously accessed, the loads are supplied with power through the load switching module, the working condition of the output end is displayed by the indicating module, and meanwhile, the output monitoring module can monitor parameters such as output voltage, current and power in real time.
Preferably, the system further comprises: and the human-computer interaction device is connected with the output monitoring module and used for receiving the output parameters monitored by the output monitoring module, displaying the output parameters to a user and receiving control parameters input by the user. The output monitoring module can monitor parameters such as output voltage, current and power in real time, data are transmitted to the human-computer interaction device, and the human-computer interaction effect of the whole converter is improved. In the operation process of the whole intelligent converter system, working state data are fed back to the human-computer interaction device through communication by the controller according to user requirements, and a user can check related working data and set the state of the converter, including output voltage, maximum output power limitation and the like, so that human-computer interaction operation is realized. The human-computer interaction device can be a display screen, an APP or a webpage and the like, and the controller is connected with the human-computer interaction device in a wired or wireless communication mode.
Meanwhile, the man-machine interaction device is also connected with the controller and used for determining the type of the load and sending the type of the load to the controller. The man-machine interaction interface determines the type of the load by receiving the load parameters input by the user, or provides the user with options of the type of the load and identifies the options selected by the user.
When a load is connected to the output end, a user sets the power supply type and voltage of the load in the man-machine interaction device, the power supply type and voltage are transmitted to the controller by using a communication device (wired communication or wireless communication), the controller switches the on-off states of the S1 and S2 switches according to a user instruction (S1 switches S2 off when the load is alternating current, S1 switches S2 on when the load is direct current), corresponding DC/AC or DC/DC conversion is carried out, the voltage of the output end is adjusted to be the corresponding power supply voltage of the load configuration, the load is supplied with power by the load switching module, the working condition of the output end is displayed by the indicating module, and meanwhile, the output monitoring module monitors parameters such as output voltage, current and power in real time and transmits data to the man-machine interaction device.
Further, the system further comprises: and the filtering device is positioned between the power supply and the control switching device and is used for filtering the output of the power supply.
According to the system, the converter can supply power to different types of loads in a compatible mode, multi-path output is supported, energy management is carried out on input photovoltaic electric quantity, intelligent interaction between a user and the converter is achieved, and user experience and using effect are improved.
Example 2
In a preferred embodiment 2 of the present invention, there is further provided a control method of a converter system compatible with different loads, which is applied to the system of the above embodiment 1, specifically, fig. 4 shows an alternative flowchart of the method, and as shown in fig. 4, the method includes the following steps S402-S404:
s402: determining the type of a load, and determining a corresponding power conversion circuit according to the type of the load; the load is a direct current load and/or an alternating current load;
s404: the control system is switched to the power supply conversion circuit corresponding to the type of the load so as to supply power to the load through the power supply.
In the above embodiment, a control method of a converter system compatible with different loads is provided, in which a power conversion circuit is switched according to types of loads to provide electric energy corresponding to the types of the loads for the loads of different types, so that the system can supply power to the loads of different types in a compatible manner, thereby effectively solving the problem that a converter is incompatible with the loads of different types in the prior art, and improving the compatibility and intelligence of the converter system.
In a preferred embodiment of the present invention, determining the type of load comprises: receiving a load parameter input by a user through a human-computer interaction device to determine the type of the load; alternatively, the user is provided with an option of the type of load and the user-selected option is identified to determine the type of load.
Preferably, determining the corresponding power conversion circuit according to the type of the load includes: when the type of the load only comprises an alternating current load, determining the corresponding power conversion circuit as a first conversion circuit; when the type of the load only comprises a direct current load, determining the corresponding power conversion circuit as a second conversion circuit; when the types of the loads comprise an alternating current load and a direct current load, the corresponding power conversion circuit is determined to be a first conversion circuit and a second conversion circuit.
Further, the control system switches to the power conversion circuit corresponding to the type of the load, and the power conversion circuit comprises: controlling the first switching circuit to close when the type of load comprises only an alternating current load; the first switching circuit is positioned between the power supply and the first conversion circuit; when the type of the load only comprises a direct current load, controlling the second switch circuit to be closed; the second switching circuit is positioned between the power supply and the second conversion circuit; and when the types of the loads comprise an alternating current load and a direct current load, controlling the first switch circuit and the second switch circuit to be closed.
In another preferred embodiment of the present invention, after supplying power to the load, the method further includes: detecting output power of a power supply and consumed power of a load; when the output power of the power supply is larger than the consumed power of the load, controlling the third switch circuit to be closed so as to merge redundant electric energy of the power supply except for the consumed power of the load into the power grid, and/or controlling the fifth switch circuit to be closed so as to store the redundant electric energy of the power supply except for the consumed power of the load into the energy storage device; the third switching circuit is positioned between the first conversion circuit and the power grid; the fifth switching circuit is positioned between the second conversion circuit and the energy storage device; and when the output power of the power supply is smaller than the consumed power of the load, executing a corresponding control strategy according to the type of the load.
Executing a corresponding control strategy according to the type of the load, wherein the control strategy comprises the following steps: when the type of the load only comprises an alternating current load, controlling the fourth switching circuit to be closed so as to supply power to the alternating current load through the power grid; the fourth switching circuit is positioned between the power grid and the load; when the type of the load only comprises a direct current load, controlling the sixth switching circuit to be closed so as to supply power to the direct current load through the energy storage device; the sixth switching circuit is positioned between the energy storage device and the load; when the types of the loads comprise an alternating current load and a direct current load, the fourth switching circuit and the sixth switching circuit are controlled to be closed so as to supply the alternating current load with power through the power grid and supply the direct current load with power through the energy storage device.
Optionally, executing a corresponding control policy according to the type of the load, further comprising: when the type of the load only comprises a direct current load, or the type of the load comprises an alternating current load and a direct current load, and the power supply cannot charge the energy storage device, controlling the seventh switch circuit to be closed so as to charge the energy storage device through the power grid; wherein the seventh switching circuit is located between the energy storage device and the grid.
Through the mode, the converter is compatible in power supply to different types of loads, multi-path output is supported, energy management is carried out on input photovoltaic electric quantity, intelligent interaction between a user and the converter is achieved, and user experience and using effect are improved.
Example 3
Based on the converter system compatible with different loads provided in the above embodiment 1, in a preferred embodiment 3 of the present invention, a power grid is further provided, which includes the converter system compatible with different loads as described in the above embodiment 1.
In the above embodiment, a converter system compatible with different loads is provided, and a power conversion circuit is switched according to types of loads to provide electric energy corresponding to the types of the loads for the loads of different types, so that the system can supply power compatibly to the loads of different types, thereby effectively solving the problem that a converter is incompatible with the loads of different types in the prior art, and improving compatibility and intelligence of the converter system.
Example 4
Based on the control method of the converter system compatible with different loads provided in the above embodiment 1, in a preferred embodiment 4 of the present invention, there is also provided a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described above.
In the above embodiment, a control method of a converter system compatible with different loads is provided, in which a power conversion circuit is switched according to types of loads to provide electric energy corresponding to the types of the loads for the loads of different types, so that the system can supply power to the loads of different types in a compatible manner, thereby effectively solving the problem that a converter is incompatible with the loads of different types in the prior art, and improving the compatibility and intelligence of the converter system.
Example 5
Based on the control method of the converter system compatible with different loads provided in the above embodiment 1, there is also provided in a preferred embodiment 5 of the present invention a storage medium containing computer executable instructions for performing the method as described above when executed by a computer processor.
In the above embodiment, a control method of a converter system compatible with different loads is provided, in which a power conversion circuit is switched according to types of loads to provide electric energy corresponding to the types of the loads for the loads of different types, so that the system can supply power to the loads of different types in a compatible manner, thereby effectively solving the problem that a converter is incompatible with the loads of different types in the prior art, and improving the compatibility and intelligence of the converter system.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (27)
1. A current transformer system compatible with different loads, comprising:
a power supply for supplying power to a load;
the power converter is positioned between the power supply and the load and comprises two paths of conversion circuits: a first conversion circuit for converting the power supply into an alternating current output; and a second conversion circuit for converting the power supply to a dc output;
the control switching device is positioned between the power supply and the power supply converter and used for controlling the system to be switched to a conversion circuit corresponding to the type of the load; wherein the load is a DC load and/or an AC load.
2. The system of claim 1, wherein the power source is a dc power source comprising at least one of: photovoltaic power generation device, wind power generation set.
3. The system of claim 1, wherein the control switching means comprises:
the switching circuit is positioned between the power supply and the power supply converter and is used for connecting the power supply and the first conversion circuit and/or connecting the power supply and the second conversion circuit;
and the controller is connected with the switching circuit and is used for controlling the system to be switched to the conversion circuit corresponding to the type of the load through the switching circuit.
4. The system of claim 3, wherein the switching circuit comprises:
a first switching circuit, located between the power supply and the first switching circuit, for closing when the load comprises an ac load, to supply power to the ac load through the power supply;
and the second switching circuit is positioned between the power supply and the second conversion circuit and is used for closing when the load comprises a direct current load so as to supply power to the direct current load through the power supply.
5. The system of claim 1, further comprising: a grid system; the power grid system includes:
and the power grid is positioned between the first conversion circuit and the load and is used for receiving the alternating current output of the first conversion circuit or supplying power to the alternating current load when the load comprises the alternating current load.
6. The system of claim 5, wherein the power grid system further comprises:
a third switch circuit, located between the first conversion circuit and the power grid, for closing when the output power of the power supply is greater than the consumed power of the load, so as to merge the surplus power of the power supply except the consumed power of the load into the power grid;
and the fourth switching circuit is positioned between the power grid and the load and used for closing to supply power for the alternating current load through the power grid when the load comprises an alternating current load and the output power of the power supply is less than the consumed power of the load.
7. The system of claim 5, further comprising: an energy storage system; the energy storage system includes:
and the energy storage device is positioned between the second conversion circuit and the load and is used for receiving and storing the direct current output of the second conversion circuit or supplying power to the direct current load when the load comprises the direct current load.
8. The system of claim 7, wherein the energy storage system further comprises:
the fifth switching circuit is positioned between the second conversion circuit and the energy storage device and is used for closing when the output power of the power supply is greater than the consumed power of the load so as to store the redundant electric energy of the power supply except the consumed power of the load;
and the sixth switching circuit is positioned between the energy storage device and the load and used for closing when the load comprises a direct current load and the output power of the power supply is less than the consumed power of the load so as to supply power for the direct current load through the energy storage device.
9. The system of claim 7, further comprising:
and the seventh switching circuit is positioned between the energy storage device and the power grid and used for controlling the power grid to charge the energy storage device.
10. The system of claim 7, further comprising:
and the input end of the output control device is connected with the power grid, the energy storage device and the power converter, and the output end of the output control device is connected with the load and is used for adjusting the electric energy input by the power converter so as to supply power for the load.
11. The system of claim 10, wherein the output control means comprises: the control device and the load access device are sequentially connected; wherein,
the control device is used for regulating the electric energy input by the power grid and/or the energy storage device and/or the power converter;
and the load access device is used for providing the electric energy regulated by the control device to the load so as to supply power to the load.
12. The system of claim 11, wherein the control device comprises:
and one end of the voltage adjusting module is connected with the input end of the control device, and the other end of the voltage adjusting module is connected with the load access device and used for adjusting the voltage of the input electric energy so as to adapt to the voltage of the load.
13. The system of claim 12, wherein the control device further comprises:
one end of the output monitoring module is connected with the input end of the control device, and the other end of the output monitoring module is connected with the load access device and used for monitoring the output parameters of the output control device in real time;
and one end of the indicating module is connected with the input end of the control device, and the other end of the indicating module is connected with the load access device and is used for displaying the working condition of the output control device.
14. The system of claim 13, further comprising:
and the human-computer interaction device is connected with the output monitoring module and used for receiving the output parameters monitored by the output monitoring module, displaying the output parameters to a user and receiving control parameters input by the user.
15. The system of claim 14, wherein the human-machine interface device is further coupled to the controller for determining a type of the load and sending the type of the load to the controller.
16. The system of claim 15, wherein the human-machine interface determines the type of the load by receiving a user-entered load parameter or by providing a user with an option of the type of the load and identifying a user-selected option.
17. The system of claim 1, further comprising:
and the filtering device is positioned between the power supply and the control switching device and is used for filtering the output of the power supply.
18. A method for controlling a converter system compatible with different loads, applied to the system according to any one of claims 1 to 17, comprising:
determining the type of a load, and determining a corresponding power conversion circuit according to the type of the load; the load is a direct current load and/or an alternating current load;
and the control system is switched to a power supply conversion circuit corresponding to the type of the load so as to supply power to the load through the power supply.
19. The method of claim 18, wherein determining the type of load comprises:
receiving a load parameter input by a user through a human-computer interaction device to determine the type of the load; or, providing the user with an option of the type of the load and identifying the option selected by the user to determine the type of the load.
20. The method of claim 18, wherein determining the corresponding power conversion circuit based on the type of the load comprises:
when the type of the load only comprises an alternating current load, determining the corresponding power conversion circuit as a first conversion circuit;
when the type of the load only comprises a direct current load, determining the corresponding power conversion circuit as a second conversion circuit;
and when the types of the loads comprise alternating current loads and direct current loads, determining the corresponding power conversion circuits as a first conversion circuit and a second conversion circuit.
21. The method of claim 20, wherein controlling the system to switch to the power conversion circuit corresponding to the type of the load comprises:
controlling the first switching circuit to close when the type of load comprises only an alternating current load; wherein the first switching circuit is located between the power supply and the first conversion circuit;
controlling a second switching circuit to close when the type of load comprises only a direct current load; wherein the second switching circuit is located between the power supply and the second conversion circuit; controlling the first and second switch circuits to be closed when the types of the loads include an alternating current load and a direct current load.
22. The method of claim 18, further comprising, after powering the load:
detecting an output power of the power supply and a consumed power of the load;
when the output power of the power supply is larger than the consumed power of the load, controlling a third switch circuit to be closed so as to merge redundant electric energy of the power supply except for the consumed power of the load into a power grid, and/or controlling a fifth switch circuit to be closed so as to store the redundant electric energy of the power supply except for the consumed power of the load into an energy storage device; wherein the third switching circuit is located between the first conversion circuit and the power grid; the fifth switching circuit is positioned between the second conversion circuit and the energy storage device;
and when the output power of the power supply is smaller than the consumed power of the load, executing a corresponding control strategy according to the type of the load.
23. The method of claim 22, wherein implementing the corresponding control strategy according to the type of the load comprises:
when the type of the load only comprises an alternating current load, controlling a fourth switching circuit to be closed so as to supply power to the alternating current load through the power grid; wherein the fourth switching circuit is located between the grid and the load;
when the type of the load only comprises a direct current load, controlling a sixth switching circuit to be closed so as to supply power to the direct current load through the energy storage device; wherein the sixth switching circuit is located between the energy storage device and the load;
when the types of the loads comprise an alternating current load and a direct current load, controlling the fourth switching circuit and the sixth switching circuit to be closed so as to supply power to the alternating current load through the power grid and supply power to the direct current load through the energy storage device.
24. The method of claim 23, wherein executing the corresponding control strategy according to the type of the load further comprises:
when the type of the load only comprises a direct current load, or the type of the load comprises an alternating current load and a direct current load, and the power supply cannot charge the energy storage device, controlling a seventh switching circuit to be closed so as to charge the energy storage device through the power grid; wherein the seventh switching circuit is located between the energy storage device and the grid.
25. A power network comprising a converter system according to any of claims 1-17 compatible with different loads.
26. A computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, implements the method of controlling a converter system compatible with different loads according to any one of claims 18 to 24.
27. A storage medium containing computer executable instructions for performing the method of controlling a converter system compatible with different loads according to any one of claims 18 to 24 when executed by a computer processor.
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| CN201811467511.9A CN109546854A (en) | 2018-12-03 | 2018-12-03 | Converter system compatible with different loads, control method thereof and power grid |
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| CN201811467511.9A CN109546854A (en) | 2018-12-03 | 2018-12-03 | Converter system compatible with different loads, control method thereof and power grid |
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