CN103795116A - Power supply change-over and control device, and power supply method and system - Google Patents
Power supply change-over and control device, and power supply method and system Download PDFInfo
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Abstract
The invention discloses a power supply change-over and control device, and a power supply method and system. The power supply change-over and control device comprises a detection module, a control module, a first switch, a second switch, an inverter and an energy processing module, wherein the detection module is used for detecting the power value of the energy end; the control module is connected with the control ends of the detection module, the first switch and the second switch, and is used for generating a first control instruction to control the switch-on of the first switch and the second switch when the power value, detected by the detection module, of the energy end is greater than a first threshold value; the first connection end of the first switch is connected with the first end of the inverter; the second connection end of the first switch is used for being connected with a power grid; the first connection end of the second switch is connected with the second end of the energy processing module and the second end of the inverter; the second connection end of the second switch is used for being connected with a storage battery. In this way, the power supply change-over and control device has high intelligence and reliability.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power supply conversion and control device, a power supply method and a power supply system.
Background
At present, there are many new energy power generation systems, such as solar power generation, i.e. photovoltaic power generation, wind power generation, hydroelectric power generation, thermal power generation, etc., which can be used independently or in a grid-connected manner.
When the energy storage system is used independently, the new energy power generation systems supply the generated electric quantity to a load through the conversion and control circuit, and transmit the generated electric quantity to the storage battery for storage. When the new energy power generation systems are used in a grid-connected mode, the generated electric quantity is provided to loads and a power grid through the conversion and control circuit.
The problem that exists at present is that these new energy power generation systems can not store the electric quantity and transmit the generated electric quantity to the power grid under the condition that the energy is sufficient, so that the electric power stability and reliability of the power supply system can not be further improved.
Disclosure of Invention
The invention aims to provide a power conversion and control device, a power supply method and a power supply system, which can determine a power supply mode according to the power value of an energy end and control an inverter to supply power to a load or a power grid, so that the power conversion and control device, the power supply method and the power supply system have higher intelligence and reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a power conversion and control apparatus, including: the device comprises a detection module, a control module, a first switch, a second switch, an inverter and an energy processing module;
the energy processing module is used for converting energy provided by the energy end into direct current;
the detection module is used for detecting the power value of the energy end;
the inverter is used for converting the direct current output by the energy processing module into alternating current;
the control module is connected with the detection module, the first switch and the control end of the second switch, and is used for generating a first control instruction to control the conduction of the first switch and the second switch when the power value of the energy end detected by the detection module is greater than a first threshold value;
the first connection end of the first switch is connected with the first end of the inverter, and the second connection end of the first switch is used for connecting a power grid;
and a first connecting end of the second switch is connected with the energy processing module and a second end of the inverter, and a second connecting end of the second switch is used for connecting a storage battery.
In a second aspect, the present invention provides a power supply method suitable for the power conversion and control device provided in the above invention, the method includes:
detecting a power value of an energy end;
determining a power supply mode according to the power value, and converting at least one energy of the energy end and the storage battery from direct current to alternating current according to the power supply mode to supply power to a load or a power grid; or, the energy on the power grid is converted from alternating current to direct current to charge the storage battery.
In a third aspect, the present invention provides a power supply system, the system comprising: the energy end capable of providing energy, a storage battery, a load and a power grid, and the power supply conversion and control device provided by all the embodiments; the power supply conversion and control device is used for supplying power to the load and storing energy generated by the energy end to the storage battery and transmitting the energy to the power grid when the power value of the energy end is larger than a first threshold value.
The invention provides a method for supplying power to a load or a power grid by detecting the power value of an energy end capable of supplying energy, determining a power supply mode according to the power value, and converting at least one energy in the energy end and a storage battery from direct current into alternating current according to the power supply mode; or, the energy on the power grid is converted into direct current from alternating current to charge the storage battery, the power supply mode is determined according to the power value of the energy end, and the inverter is controlled to supply power to the load or the power grid, so that the power supply conversion and control device, the power supply method and the power supply system have high intelligence and reliability.
Drawings
Fig. 1 is a schematic diagram of a power supply system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power conversion and control apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a power conversion and control apparatus according to a third embodiment of the present invention;
fig. 4a is a schematic diagram of an energy trend of a power conversion and control device according to a third embodiment of the present invention;
fig. 4b is a schematic diagram of the energy trend of the power conversion and control device according to the third embodiment of the present invention;
fig. 4c is a schematic diagram of the energy trend of the power conversion and control device according to the third embodiment of the present invention;
fig. 4d is a schematic diagram of the energy trend of the power conversion and control device according to the third embodiment of the present invention;
fig. 4e is a schematic diagram of the energy trend of the power conversion and control device according to the third embodiment of the present invention;
fig. 4f is a schematic diagram of the energy trend of the power conversion and control device according to the third embodiment of the present invention;
fig. 5 is a circuit diagram of a power conversion and control apparatus according to a third embodiment of the present invention;
fig. 6 is a flowchart of a power supply method according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
Fig. 1 is a schematic diagram of a power supply system according to an embodiment of the present invention. As shown in fig. 1, the power supply system includes: the system comprises a power conversion and control device 11, a first energy end 12, a second energy end 13, a storage battery 14, a load 15 and a power grid 16. Wherein the first energy end 12 provides wind energy, for example, a wind generator can provide wind energy; the second energy terminal 13 provides solar energy. In the embodiment of the present invention, the power supply system includes the first energy terminal 12 and the second energy terminal 13, but the power supply system may include only the first energy terminal 12 or the second energy terminal 13.
The power conversion and control device 11 is used for obtaining any one of the first energy end 12, the second energy end 13 and the storage battery 14 to supply power to the load 15 or the power grid 16.
The following describes the operation of the power conversion and control device 11 in detail from six working scenarios:
(1) when the power grid 16 is normal in the daytime and the power of wind energy and solar energy is sufficient, the power conversion and control device 11 can control the first energy end 12 and the second energy end 13 to supply power to the load 15, and then can make the excess power satisfy the charging power of the storage battery 14 again (the charging current is 5-100A is optional, and is set according to the capacity of the storage battery), and then if the excess power exists, can close a power grid switch, for example, an STS switch, to generate power on the power grid 16, and the power supply mode of the system is a parallel-grid and off-grid mode. At this time, the sum of the solar power and the wind power is equal to the sum of the load power, the charging power and the generating power.
(2) When the power grid 16 is normal in the daytime and the power of the wind energy and the solar energy is insufficient, the power conversion and control device 11 can control the first energy end 12, the second energy end 13 and the storage battery 14 to jointly supply power to the load 15, and the power supply mode of the system is the off-grid mode. At this time, the sum of the solar power, the wind power and the storage battery is equal to the load power.
(3) When the night grid 16 is normal and the wind energy power is sufficient, the power conversion and control device 11 can control the first energy end 12 to supply power to the load 15, and then can make the excess power satisfy the charging power of the storage battery 14 again (the charging current is 5-100A is optional, and is set according to the capacity of the storage battery), and then if the excess power exists, the grid switch, for example, the STS switch can be closed to generate power on the grid 16, and the power supply mode of the system is the grid-connected and off-grid mode. At this time, the wind power is equal to the sum of the load power, the charging power, and the generated power.
(4) When the night power grid 16 is normal and the wind energy power is insufficient, the power conversion and control device 11 can control the first energy end 12 and the storage battery 14 to supply power to the load 15, and the power supply mode of the system is the off-grid mode. At this time, the sum of the wind power and the storage battery is equal to the load power.
(5) When the power grid 16 is normal, and the solar energy and the wind energy are abnormal or failed, the power conversion and control device 11 may control the storage battery 14 to supply power to the load 15 until the storage battery 14 is discharged, and at this time, the low-voltage shutdown protection state is achieved.
(6) When the power grid 16 is normal, and the storage battery 14 is discharged and shut down at a low voltage, the power conversion and control device 11 can control to close the power grid switch, so that the power grid 16 is used for supplying power to the load 15, and the power grid 16 is used for charging the storage battery 14.
Fig. 2 is a schematic diagram of a power conversion and control device according to a second embodiment of the present invention. The power conversion and control device can be applied to the power supply system shown in fig. 1. As shown, the power conversion and control device 11 includes: a detection module 21, a control module 22, an inverter 23, an energy processing module 24 corresponding to an energy end that can provide energy, and a first switch 25 and a second switch 26. The energy terminals 20 may be the first energy terminal 12 and the second energy terminal 13 in fig. 1.
The detection module 21 is used for detecting the power value of the energy end 20 which can provide energy. The energy provided by the energy terminal 20 may be wind energy or solar energy. In addition, energy obtained from water conservancy power generation, energy obtained from thermal power generation (e.g., geothermal), and the like may be used.
The control module 22 is configured to be connected to the control ends of the detection module 21, the first switch 25, and the second switch 26, and configured to generate a first control instruction to control the first switch 25 and the second switch 26 to be turned on when the power value of the energy end 20 detected by the detection module 21 is greater than a first threshold; the control module 22 is further configured to determine a power supply mode according to the power value obtained by the detection module 21, and control the inverter 23 to supply power or charge according to the power supply mode. The power supply mode may be a grid-connected mode or an off-grid mode.
The inverter 23 is used for converting the dc power output by the energy processing module 24 into ac power, such as: converting at least one of the energy terminal 20 and the battery 14 from direct current to alternating current to power the load 15; alternatively, the energy on the grid 16 is converted from ac to dc to charge the battery 14. The inverter 23 can convert at least one of the energy terminal 20 and the energy of the storage battery 14 from direct current to alternating current to supply power to the load 15 or the power grid 16; the energy on the grid 16 may also be converted from ac to dc to charge the battery 14.
The energy processing module 24 is used for converting the energy provided by the energy terminal 20 into direct current.
The energy output end of the energy processing module 24 and the energy output end of the storage battery 14 are connected in parallel to the direct current input end of the inverter 23, and the alternating current output end of the inverter 23 is connected with the load 15 and the power grid 16 respectively.
The first connection end of the first switch 25 is connected to the first end of the inverter, and the second connection end of the first switch 25 is used for connecting to a power grid; a first connection end of the second switch 26 is connected to the energy processing module and a second end of the inverter, and a second connection end of the second switch 26 is used for connecting a battery.
In the embodiment of the present invention, when the detection module 21 detects that the power value of the energy provided by the energy terminal 20, for example, wind energy or solar energy, reaches the first threshold, that is, the energy provided by the energy terminal is sufficient, the control module 22 determines that the power supply mode is the grid-connected mode, generates a first control command to control the first switch 25 and the second switch 26 to be turned on, and controls the grid switch 25 to be turned on, so that the inverter 23 supplies power to the load 15 by using the energy generated by the energy terminal, and stores the remaining energy in the storage battery 14 and transmits the remaining energy to the grid 16.
In the above solution, when the detection module 21 detects that the value of the energy power provided by the energy terminal 20, for example, wind energy or solar energy, is less than the first threshold, that is, the energy provided by the energy terminal is insufficient, the control module 22 determines that the power supply mode is the off-grid mode, and generates a second control command to control the first switch 25 to be turned off and the second switch 26 to be turned on, so that the energy provided by the energy terminal 20 and the storage battery 14 is supplied to the load 15 through the inverter 23, but not supplied to the grid 16.
When the detection module 21 detects that the power value of the energy provided by the energy terminal 20, for example, wind energy or solar energy, is very small, that is, the wind energy and the solar energy are failed, the control module 22 determines that the power supply mode is the off-grid mode, generates a second control command to control the first switch 25 to be turned off and the second switch 26 to be turned on, so that the energy provided by the battery 14 is supplied to the load 15 through the inverter 23 until the battery discharge is terminated.
And when the discharging of the storage battery 14 is terminated, the control module 22 determines that the power supply mode is the grid-connected and off-grid mode, generates a first control instruction to control the first switch 25 and the second switch 26 to be switched on, so as to supply power to the load 15 through the power grid 16, and charges the storage battery 14 through the inverter 23 by using the energy of the power grid 16.
Therefore, the power conversion and control device provided by the embodiment of the invention connects the energy output end of the energy processing module and the energy output end of the storage battery to the direct current input end of the inverter in parallel, the alternating current output end of the inverter is respectively connected with the load and the power grid, and the detection module is used for detecting the power value of the energy end capable of providing energy, the control module determines the power supply mode according to the power value obtained by the detection module, according to the power supply mode, the inverter is controlled to convert at least one of the energy end and the storage battery from direct current to alternating current to supply power to a load or a power grid, or the energy on the power grid is converted from alternating current to direct current to charge the storage battery, thereby realizing the determination of the power supply mode according to the power value of the energy end, and the inverter is controlled to supply power to the load or the power grid, so that the power conversion and control device has higher intelligence and reliability.
Fig. 3 is a schematic diagram of a power conversion and control device according to a third embodiment of the present invention. The power conversion and control device can be applied to the power supply system shown in fig. 1. As shown in the figure, the power conversion and control device comprises: the detection module 21, the control module 22, the inverter 23, a first processing circuit 31 corresponding to the first energy terminal 12, and a second processing circuit 32 corresponding to the second energy terminal 13. In addition, the power conversion and control device further includes a first switch 33 and a second switch 34.
A first connection end of the first switch 33 is connected with a first end of the inverter 23, and a second connection end of the first switch 34 is used for connecting a power grid;
a first connection end of the second switch 34 is connected to the first processing circuit 31, the second processing circuit 32 and a second end of the inverter, respectively, and a second connection end of the second switch 34 is used for connecting a battery. In addition, the first switch 33 and the second switch 34 may be both Static Transfer Switch (STS) switches, and the first switch 3333 is configured to receive a control command from the control module 22 and control a connection state between the grid 16 and the inverter 23, where the connection state includes a closed state or an open state. The second switch 34 is configured to receive a control command from the control module 22 and control a connection state between the battery 14 and the inverter 23, where the connection state includes a closed state or an open state.
The power conversion and control device further comprises an output isolation transformer 35 which is respectively connected with the inverter 23 and the load 15, so that the inverter 23 and the load 15 are isolated on a circuit, and the inverter 23 and the load 15 are ensured to work reliably.
Wherein the inverter 23 can convert at least one of the energy terminal and the energy of the storage battery from direct current to alternating current to supply power to the load 15 or the power grid 16; the energy on the grid can also be converted from ac to dc to charge the battery 14.
In contrast to fig. 2, the energy processing module 24 in fig. 2 may comprise the first processing circuit 31 and/or the second processing circuit 32 in fig. 3. That is, the energy processing module 24 may only include the first processing circuit 31 corresponding to the first energy terminal 12, may only include the second processing circuit 32 corresponding to the second energy terminal, and may further include the first processing circuit 31 corresponding to the first energy terminal and the second processing circuit 32 corresponding to the second energy terminal. The energy provided by the first energy end is wind energy, and the energy provided by the second energy end is solar energy.
The first processing circuit 31 includes a rectifying circuit and a first BUCK chopper BUCK circuit; the rectifying circuit and the first BUCK circuit are respectively used for rectifying and reducing the wind energy provided by the first energy end and then outputting the energy to the direct current input end of the inverter; the second processing circuit 32 includes a second BUCK circuit; the second BUCK circuit is configured to step down the solar energy provided by the second energy end, and output energy to the dc input end of the inverter 23.
The energy output of the first processing circuit 31, the energy output of the first processing circuit 32 and the energy output of the battery 14 are connected in parallel to the dc input of the inverter 23, and the ac output of the inverter 23 is connected to the load 15 and the grid 16, respectively.
The working process of the control module 22 in the power conversion and control device is specifically described by taking the energy provided by the first energy end as wind energy and the energy provided by the second energy end as solar energy as an example:
(1) when the sum of the power value of the wind energy provided by the first energy end 12 and the power value of the solar energy provided by the second energy end 13 is greater than a second threshold value, the power supply mode is determined to be a grid-connected mode and a grid-disconnected mode, and a first control instruction is generated to control the first switch 33 and the second switch 34 to be conducted, so that the inverter 23 supplies power to the load 15, the storage battery 14 and the power grid 16 by utilizing the wind energy and the solar energy in sequence.
When the power value of the wind energy provided by the first energy end 12 is relatively large, the power value of the solar energy provided by the second energy end 13 is relatively small, but the sum of the power values is still larger than a second threshold value, a first control instruction can be generated to control the first switch 33 and the second switch 34 to be switched on, so that the inverter 23 supplies power to the load 15, the storage battery 14 and the power grid 16 by utilizing the wind energy.
The scheme (1) can be applied to the following two application scenarios:
firstly, as shown in fig. 4a, when the power grid is normal in daytime, the solar energy and wind energy have sufficient power, the power of the solar energy and the power of the wind energy are collected on the dc bus, and the dc bus passes through the inverter 43 and the isolation transformer 44 to supply power to the load, and after the load is satisfied, if the redundant power is conducted through the second switch 48, the charging power of the storage battery is satisfied (the charging current is 5-100A is selectable, and the setting according to the capacity of the storage battery), and if the redundant power is still available, the power is supplied to the power grid after the redundant power is conducted through the first switch (STS switch) 41. At this time, the power supply mode of the power conversion and control device is the grid-connected and off-grid mode, and the energy flow is shown by the gray arrows in the figure. Wherein, solar power + wind power = load power + charging power + generated power.
Secondly, as shown in fig. 4b, the power grid is normal at night, the power of the wind energy is sufficient, the power of the wind energy is added to the dc bus, and the power is supplied to the load through the inverter 43 and the isolation transformer 44, so that the charging power of the storage battery (the charging current is 5-100A is selectable according to the capacity of the storage battery) is satisfied after the load is conducted by the second switch 48, and the power is supplied to the power grid after the load is conducted by the first switch (STS switch) 41. At this time, the power supply mode of the power conversion and control device is the grid-connected and off-grid mode, and the energy flow is shown by the gray arrows in the figure. Wherein, wind power = load power + charging power + generation power.
(2) When the sum of the power value of the wind energy provided by the first energy end 12 and the power value of the solar energy provided by the second energy end 13 is smaller than a second threshold value, the power supply mode is determined to be an off-grid mode, and a second control instruction is generated to control the first switch 33 to be switched off and the second switch 34 to be switched on, so that the load 15 is supplied with the wind energy, the solar energy and the storage battery 14 through the inverter 23.
The scheme (2) can be applied to the following two application scenarios:
first, as shown in fig. 4c, when the power grid is normal in the daytime and the solar and wind power is insufficient, the solar power, the wind power, and the storage battery are collected on the dc bus, the first switch (STS switch) 41 is turned off, the second switch 48 is turned on, and the load is supplied with power through the inverter 43 and the isolation transformer 44. At this time, the power supply mode of the power conversion and control device is off-grid mode, and the energy flow is shown by the gray arrows in the figure. Wherein, solar power + wind power + battery = load power.
Secondly, as shown in fig. 4d, the grid is normal at night, the wind power is insufficient, the power of the wind power is collected on the dc bus together with the storage battery, the first switch (STS switch) 41 is turned off, the second switch 48 is turned on, and the load is supplied with power after passing through the inverter 43 and the isolation transformer 44. At this time, the power supply mode of the power conversion and control device is off-grid mode, and the energy flow is shown by the gray arrows in the figure. Wherein, wind power + battery = load power.
(3) When the wind energy and the solar energy are in failure, determining that the power supply mode is an off-grid mode, generating a second control instruction to control the first switch 33 to be switched off and the second switch 34 to be switched on, so that the inverter 23 supplies power to the load 15 by using the energy provided by the storage battery 14 until the storage battery 14 stops discharging; and when the storage battery 14 is discharged, determining that the power supply mode is the grid-connected and off-grid mode, generating a first control instruction to control the first switch 33 and the second switch 34 to be switched on, so as to supply power to the load 15 through the power grid 16, and charging the storage battery 14 through the inverter 24 by using the power grid energy.
The scheme (3) can be applied to the following two application scenarios:
first, as shown in fig. 4e, when the grid is normal and the solar energy and wind energy are abnormal or failed, the storage battery is connected to the dc bus, the first switch (STS switch) 41 is opened, the second switch 48 is closed, and the load is supplied with power through the isolation transformer 44 until the storage battery discharge is terminated (low-voltage shutdown protection). At this time, the power supply mode of the power conversion and control device is off-grid mode, and the energy flow is shown by the gray arrows in the figure.
Secondly, as shown in fig. 4f, when the grid is normal, and the storage battery is discharged and turned off at low voltage, the first switch (STS switch) 41 is turned on, the first switch 41 and the second switch 48 are closed, the grid supplies power to the load, and the storage battery is charged through the isolation transformer 44 and the inverter 43. At this time, the power supply mode of the power conversion and control device is the grid-connected and off-grid mode, and the energy flow is shown by the gray arrows in the figure.
The circuit diagram shown in fig. 5 is taken as an example to specifically describe a specific implementation form of each part of the power conversion and control device provided in the foregoing embodiment. As shown, the wind power generator may be a first energy terminal 12 and the photovoltaic panel may be a second energy terminal 13.
A first BUCK circuit is composed of a capacitor C5, a capacitor C6, a triode K2, a diode D2 and an inductor L2; the diode D3, the diode D4, the diode D5 and the diode D6 form a rectifying circuit; the first BUCK circuit and the rectifier circuit constitute a first processing circuit 31 corresponding to the first energy terminal 12.
The capacitor C1, the capacitor C2, the transistor K1, the diode D1, and the inductor L1 constitute a second BUCK circuit, and the second BUCK circuit constitutes a second processing circuit 32 corresponding to the second energy terminal 13.
The inverter 23 is composed of a triode K3, a triode K4, a triode K5 and a triode K6.
The STS switch is the first switch 33.
The TRANS transformer is an output isolation transformer 35.
The BAT + end and the BAT-end are used for connecting a storage battery; or the second switch 34 is passed before the battery is connected.
In the embodiment of the invention, the energy output by the wind driven generator is rectified by the rectifying circuit, and after being reduced by the first BUCK circuit, the solar energy provided by the photovoltaic polar plate is reduced by the second BUCK circuit, is connected with the output end of the storage battery in parallel and is connected to the direct current bus, and then is supplied to a load or a power grid through the inverter and the isolation transformer.
Fig. 6 is a schematic diagram of a power supply method according to a fourth embodiment of the present invention. The power supply method can be applied to the power supply system shown in fig. 1, and the execution main body of the power supply method is the power supply conversion and control device described in all the above embodiments. As shown in the figure, the power supply method includes:
In one embodiment, step 620 may specifically include:
when detecting that the energy power value provided by the energy end reaches a first threshold value, determining that the power supply mode is a grid-connected and off-grid mode, and supplying power to a load, a storage battery and a power grid in sequence by using the energy provided by the energy end; or,
when detecting that the energy power value provided by the energy end is smaller than a first threshold value, determining that the power supply mode is an off-grid mode, and supplying power to a load by using the energy provided by the energy end and the storage battery; or; or,
when the energy end is detected to have a fault, determining that the power supply mode is an off-grid mode, and supplying power to a load by using the energy provided by the storage battery until the storage battery is discharged; and after the storage battery is discharged, determining that the power supply mode is a grid-connected and off-grid mode, controlling the power grid to supply power to the load, and charging the storage battery by using the energy of the power grid.
In another embodiment, the energy terminals include a first energy terminal providing wind energy and a second energy terminal providing solar energy, and step 620 may specifically include:
when the sum of the power value of the wind energy provided by the first energy end and the power value of the solar energy provided by the second energy end is larger than a second threshold value, determining that the power supply mode is a grid-connected mode and supplying power to a load, a storage battery and a power grid in sequence by using the wind energy provided by the first energy end and the solar energy provided by the second energy end; or,
when the sum of the power value of the wind energy provided by the first energy end and the power value of the solar energy provided by the second energy end is smaller than a second threshold value, determining that the power supply mode is an off-grid mode, and supplying power to a load by using the wind energy provided by the first energy end, the solar energy provided by the second energy end and the energy provided by the storage battery; or,
when the wind energy and the solar energy are in failure, determining that the power supply mode is a low-voltage shutdown protection mode, and supplying power to a load by using the energy provided by the storage battery until the storage battery is discharged; and after the storage battery is discharged, determining that the power supply mode is a grid-connected and off-grid mode, controlling the power grid to supply power to the load, and charging the storage battery by using the energy of the power grid.
Therefore, the embodiment of the invention detects the power value of the energy end capable of providing energy, determines the power supply mode according to the power value, and converts at least one energy of the energy end and the storage battery from direct current to alternating current according to the power supply mode to supply power to the load or the power grid; or, the energy on the power grid is converted into direct current from alternating current to charge the storage battery, the power supply mode is determined according to the power value of the energy end, and the inverter is controlled to supply power to the load or the power grid, so that the power supply method has high intelligence and reliability.
The present invention also provides a power supply system, the system comprising: energy terminal, battery, load and electric wire netting, and the power conversion and control device of all the embodiments described above. Wherein, the energy end can include a first energy end for providing wind energy and a second energy end for providing solar energy. And the power supply conversion and control device is used for supplying power to the load when the power value of the energy end is larger than a first threshold value, storing the energy generated by the energy end into the storage battery and transmitting the energy to the power grid.
Claims (9)
1. A power conversion and control device, comprising: the device comprises a detection module, a control module, a first switch, a second switch, an inverter and an energy processing module;
the energy processing module is used for converting energy provided by the energy end into direct current;
the detection module is used for detecting the power value of the energy end;
the inverter is used for converting the direct current output by the energy processing module into alternating current;
the control module is connected with the detection module, the first switch and the control end of the second switch, and is used for generating a first control instruction to control the conduction of the first switch and the second switch when the power value of the energy end detected by the detection module is greater than a first threshold value;
the first connection end of the first switch is connected with the first end of the inverter, and the second connection end of the first switch is used for connecting a power grid;
and a first connecting end of the second switch is connected with the energy processing module and a second end of the inverter, and a second connecting end of the second switch is used for connecting a storage battery.
2. The power conversion and control device of claim 1, wherein the control module is specifically configured to:
when the power value of the energy end detected by the detection module is larger than a first threshold value, the control module determines that a power supply mode is a grid-connected and off-grid mode, and generates a first control instruction to control the first switch and the second switch to be conducted, so that the inverter supplies power to a load by using the energy generated by the energy end, and simultaneously stores the residual energy into the storage battery and transmits the residual energy to the power grid;
when the detection module detects that the energy power value provided by the energy end is smaller than a first threshold value, the control module determines that the power supply mode is an off-grid mode, and generates a second control instruction to control the first switch to be switched off and the second switch to be switched on, so that the inverter supplies power to the load by using the energy provided by the energy end and the storage battery;
when the detection module detects that the energy end has a fault, the control module determines that a power supply mode is an off-grid mode, generates a second control instruction to control the first switch to be switched off and the second switch to be switched on, so that the inverter supplies power to a load by using energy provided by the storage battery until the storage battery is discharged; and after the storage battery is discharged, the control module determines that the power supply mode is a grid-connected and off-grid mode, generates a first control instruction to control the first switch and the second switch to be switched on, so that the power is supplied to the load through the power grid, and the storage battery is charged through the inverter by using the energy of the power grid.
3. The power conversion and control device according to claim 1 or 2, wherein the energy processing module comprises a first processing circuit corresponding to a first energy terminal and/or a second processing circuit corresponding to a second energy terminal;
the first processing circuit comprises a rectifying circuit and a first BUCK chopper BUCK circuit; the rectifying circuit and the first BUCK circuit are respectively used for rectifying and reducing the wind energy provided by the first energy end and then outputting the energy to the direct current input end of the inverter;
the second processing circuit comprises a second BUCK circuit; the second BUCK circuit is used for outputting energy to the direct-current input end of the inverter after the solar energy provided by the second energy end is subjected to voltage reduction;
the energy output end of the first processing circuit, the energy output end of the first processing circuit and the energy output end of the storage battery are connected to the direct current input end of the inverter in parallel, and the alternating current output end of the inverter is connected with the load and the power grid respectively.
4. The power conversion and control device of claim 3, wherein the inverter is specifically configured to: converting the energy of at least one of the energy end and the energy of the storage battery from direct current to alternating current to supply power to a load or a power grid; or when the inverter is a charger, the energy on the power grid is converted from alternating current to direct current to charge the storage battery.
5. The power conversion and control device according to claim 4, wherein the control module is further configured to:
when the sum of the power value of the wind energy provided by the first energy end and the power value of the solar energy provided by the second energy end is larger than a second threshold value, determining that the power supply mode is a grid-connected mode and an off-grid mode, controlling the conduction of the power grid switch, and generating a first control instruction to control the conduction of the first switch and the second switch, so that the inverter supplies power to the load, the storage battery and the power grid by utilizing the wind energy and the solar energy in sequence; or,
when the sum of the power value of the wind energy provided by the first energy end and the power value of the solar energy provided by the second energy end is smaller than a second threshold value, determining that the power supply mode is an off-grid mode, and generating a second control instruction to control the first switch to be switched off and the second switch to be switched on, so that the inverter supplies power to the load by using the wind energy, the solar energy and the storage battery; or,
when wind energy and solar energy are in fault, the control module determines that a power supply mode is an off-grid mode, and generates a second control instruction to control the first switch to be switched off and the second switch to be switched on, so that the inverter supplies power to the load by using energy provided by the storage battery until the storage battery is discharged; and after the storage battery is discharged, determining that the power supply mode is a grid-connected and off-grid mode, generating a first control instruction to control the first switch and the second switch to be conducted, so that the power grid is used for supplying power to the load, and the storage battery is charged by the inverter through the energy of the power grid.
6. A power supply method applied to the power conversion and control device according to any one of claims 1 to 5, wherein the method comprises:
detecting a power value of an energy end;
determining a power supply mode according to the power value, and converting at least one energy of the energy end and the storage battery from direct current to alternating current according to the power supply mode to supply power to a load or a power grid; or, the energy on the power grid is converted from alternating current to direct current to charge the storage battery.
7. The power supply method according to claim 6, wherein the power supply mode is determined based on the power value, and at least one of the energy terminal and the storage battery is converted from direct current to alternating current according to the power supply mode to supply power to a load or a power grid; or, converting the energy on the power grid from alternating current to direct current, and specifically including:
when detecting that the energy power value provided by the energy end reaches a first threshold value, determining that a power supply mode is a grid-connected and off-grid mode, and supplying power to a load, a storage battery and a power grid in sequence by using the energy provided by the energy end; or,
when detecting that the energy power value provided by the energy end is smaller than a first threshold value, determining that a power supply mode is an off-grid mode, and supplying power to a load by using the energy provided by the energy end and a storage battery; or,
when the energy end is detected to have a fault, determining that a power supply mode is an off-grid mode, and supplying power to a load by using the energy provided by the storage battery until the storage battery is discharged; and after the storage battery is discharged, determining that the power supply mode is a grid-connected and off-grid mode, controlling the power grid to supply power to the load, and charging the storage battery by using the energy of the power grid.
8. The power supply method according to claim 6, wherein the energy terminals include a first energy terminal providing wind energy and a second energy terminal providing solar energy; determining a power supply mode according to the power value, and converting at least one energy of the energy end and the storage battery from direct current to alternating current according to the power supply mode to supply power to a load or a power grid; or, converting the energy on the power grid from alternating current to direct current, and specifically including:
when the sum of the power value of the wind energy provided by the first energy end and the power value of the solar energy provided by the second energy end is larger than a second threshold value, determining that the power supply mode is a grid-connected mode and supplying power to a load, a storage battery and a power grid by using the wind energy provided by the first energy end and the solar energy provided by the second energy end in sequence; or,
when the sum of the power value of the wind energy provided by the first energy end and the power value of the solar energy provided by the second energy end is smaller than a second threshold value, determining that the power supply mode is an off-grid mode, and supplying power to a load by using the wind energy provided by the first energy end, the solar energy provided by the second energy end and the energy provided by a storage battery; or,
when the wind energy and the solar energy are in failure, determining that the power supply mode is an off-grid mode, and supplying power to a load by using the energy provided by the storage battery until the storage battery is discharged; and after the storage battery is discharged, determining that the power supply mode is a grid-connected and off-grid mode, so that the power grid is used for supplying power to the load, and the storage battery is charged by the energy of the power grid through the inverter.
9. A power supply system, characterized in that the system comprises: energy terminals, accumulators, loads, grids, and the power conversion and control device of any of claims 1-5; the power supply conversion and control device is used for supplying power to the load and storing energy generated by the energy end to the storage battery and transmitting the energy to the power grid when the power value of the energy end is larger than a first threshold value.
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