CN222147556U - Inverter circuit, photovoltaic system and electric equipment - Google Patents
Inverter circuit, photovoltaic system and electric equipment Download PDFInfo
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- CN222147556U CN222147556U CN202323632971.1U CN202323632971U CN222147556U CN 222147556 U CN222147556 U CN 222147556U CN 202323632971 U CN202323632971 U CN 202323632971U CN 222147556 U CN222147556 U CN 222147556U
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Abstract
The application relates to an inverter circuit, a photovoltaic system and electric equipment, wherein the circuit comprises a conversion circuit and an inverter, the conversion circuit comprises a first branch and a second branch, the first ends of the first branch and the second branch are connected to a photovoltaic module, a DC/DC converter is arranged on the first branch, the second ends of the first branch are further connected to a storage battery, the second ends of the first branch and the second branch are connected with the inverter, the inverter is further electrically connected with the storage battery, a first MPPT controller is electrically connected with the inverter, if the first branch is conducted, the photovoltaic module supplies power for the inverter and/or the storage battery through the first branch, and if the first branch is disconnected, the second branch is conducted, and the photovoltaic module supplies power for the inverter through the second branch. The application has the effect of adapting to different working environments and realizing the utilization of photovoltaic energy with maximum efficiency.
Description
Technical Field
The application relates to the technical field of photovoltaic equipment, in particular to an inverter circuit, a photovoltaic system and electric equipment.
Background
At present, as the power demand increases, the problems of shortage of electricity generation promotion, high electricity price and the like are more and more severe in partial areas. For families with independent balconies, photovoltaic systems such as balcony photovoltaic products can reduce electricity cost, and meanwhile, the photovoltaic systems can serve as emergency standby power supplies to improve the reliability of power supply of the families.
In the related art, a photovoltaic system is generally that a plurality of photovoltaic panels are connected in series or in series-parallel to an MPPT controller at a photovoltaic side to generate a DC bus, and then the DC bus is inverted by an inverter or a DC/DC module at a battery side is used to charge a battery. If the energy storage battery is required to directly supply power to the power grid without passing through the DC/DC module, the DC/DC module can be arranged on the photovoltaic side and the branch is increased, so that the photovoltaic panel can supply power to the inverter without passing through the DC/DC module, but the MPPT is only arranged on the photovoltaic side, the output power of the photovoltaic panel cannot be effectively controlled in the mode, and different power supply requirements under various working conditions cannot be met.
Disclosure of utility model
The application is proposed to solve the above problems, according to one aspect of the application, there is provided an inverter circuit comprising a conversion circuit including a first branch and a second branch, a first end of the first branch and a first end of the second branch being connected to a photovoltaic module, the first branch being provided with a DC/DC converter, a second end of the first branch being further connected to a battery, an inverter, the first branch and a second end of the second branch being connected to the inverter, the inverter being further electrically connected to the battery, a first MPPT controller being electrically connected to the inverter for controlling the power output to the inverter by the photovoltaic module, the second branch being disconnected if the first branch is on, the photovoltaic module being powered to the inverter and/or the battery by the first branch, the second branch being powered to the inverter by the second branch if the first branch is off.
The switching circuit is connected with a first controller, the first controller is electrically connected with the storage battery, the first controller is used for controlling the switching circuit to switch between a first state and a second state, when the switching circuit is in the first state, the first branch is conducted, the second branch is disconnected, and when the switching circuit is in the second state, the first branch is disconnected, and the second branch is conducted.
The first controller is configured to control the switching circuit to switch between the first state and the second state according to a battery capacity of the storage battery and a power generation of the photovoltaic module.
The first controller is configured to control the first branch of the conversion circuit to be on and the second branch to be off when the generated power is between a first threshold value and a second threshold value and the battery power is greater than the first power threshold value, and the photovoltaic component is configured to supply power to the inverter through the first branch and the storage battery is configured to supply power to the inverter.
The first controller controls the first branch of the conversion circuit to be conducted and the second branch to be disconnected when the generated power is not larger than a second threshold value and the battery power is larger than a first power threshold value, and the photovoltaic module stops supplying power to the inverter, and the storage battery is configured to supply power to the inverter.
Illustratively, when the generated power is greater than a first threshold and the battery power is less than a second power threshold, the first controller controls the first branch of the conversion circuit to be on and the second branch to be off; the photovoltaic assembly is configured to power the inverter through the first branch and charge the battery through the first branch.
The first controller is configured to control the first branch of the conversion circuit to be disconnected and the second branch to be conducted when the generated power is larger than a first threshold value and the battery electric quantity is equal to the second electric quantity threshold value, and the photovoltaic component is configured to supply power to the inverter through the second branch.
The first MPPT controller is illustratively disposed on and electrically connected with the inverter.
The second branch is provided with a control switch, and the first controller is configured to control the control switch to be closed so as to enable the second branch to be conducted.
The first branch is also connected with a second MPPT controller, when the conversion circuit enters the first state, the first MPPT controller is closed, the second MPPT controller is opened to control the output power of the photovoltaic module, and when the conversion circuit enters the second state, the first MPPT controller is opened, and the second MPPT controller is closed.
The number of the conversion circuits is multiple, the first ends of the conversion circuits are respectively used for being connected with one photovoltaic module, the second ends of the conversion circuits are connected with the same inverter, and the conversion circuits are also used for being connected with the same storage battery.
According to another aspect of the present application, there is provided a photovoltaic system comprising a photovoltaic module, a battery, and the inverter circuit described above.
According to still another aspect of the present application, there is provided an electric device including the above-described photovoltaic system.
According to the inverter circuit and the photovoltaic system, the photovoltaic module, the storage battery and the inverter are connected by using the conversion circuit, the storage battery can directly supply power to the inverter without a DC/DC converter, when the second branch is conducted, the photovoltaic module can directly supply power to the inverter without the DC/DC converter so as to reduce the power supply loss, when the first branch is conducted, the photovoltaic module can supply power to the inverter and also can supply power to the storage battery, and in different states, the power of the photovoltaic panel can be controlled by the MPPT controller so as to adapt to different working environments, and the effect of utilizing photovoltaic energy with maximum efficiency is achieved.
Drawings
The above and other objects, features and advantages of the present application will become more apparent from the following more particular description of embodiments of the present application, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.
Fig. 1 shows a block diagram of a photovoltaic system in the related art.
Fig. 2 shows a schematic block diagram of a photovoltaic system in an embodiment of the present application.
Fig. 3 shows a circuit diagram of a photovoltaic system in an embodiment of the present application.
Fig. 4 shows a block diagram of a photovoltaic system in an embodiment of the present application.
Fig. 5 shows a state table of the photovoltaic system under different working conditions in the embodiment of the present application.
Fig. 6 (a) -6 (d) are block diagrams illustrating the working states of the photovoltaic system under different working conditions in the embodiment of the present application.
Fig. 7 shows a logic diagram of voltage conversion in a photovoltaic system in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and it should be understood that the present application is not limited by the example embodiments described herein. Based on the embodiments of the application described in the present application, all other embodiments that a person skilled in the art would have without inventive effort shall fall within the scope of the application.
As shown in fig. 1, a photovoltaic system in the related art is shown. In the related art, a photovoltaic system and a plurality of photovoltaic panels are connected in series or in series-parallel and then connected into an MPPT controller to generate a direct current bus, and meanwhile, the direct current bus is inverted through an inverter or a battery is charged through a DC/DC module at the battery side. The photovoltaic panel needs to be supplied with power through an inverter after being connected to an MPPT controller at the photovoltaic side, and an energy storage battery is difficult to directly supply power to a power grid without a DC/DC module, so that photovoltaic energy cannot be utilized efficiently. When the photovoltaic panel is in a night state, the photovoltaic panel is difficult to supply power, the battery is needed to supply power, but the battery is needed to boost voltage through the DC/DC module and then is converted through the inverter, so that energy loss can be caused.
The embodiment of the application provides an inverter circuit and a photovoltaic system, wherein the inverter circuit comprises a conversion circuit and an inverter, and the photovoltaic system comprises: photovoltaic module, battery and this inverter circuit.
Fig. 2 is a block diagram of a photovoltaic system according to an embodiment of the present application. The conversion circuit comprises a first branch and a second branch, wherein the first ends of the first branch and the second branch are connected with the photovoltaic module, the second ends of the first branch and the second branch are connected with the inverter, the first branch is provided with a DC/DC converter, the second end of the first branch is also connected with the storage battery, and the storage battery is also electrically connected with the inverter. The inverter is electrically connected with a first MPPT (maximum power point tracking ) controller, and the first MPPT controller is used for controlling the power output to the inverter by the photovoltaic module.
If the first branch is conducted, the second branch is disconnected, and the photovoltaic module supplies power for the inverter and/or the storage battery through the first branch. If the first branch is disconnected, the second branch is conducted, and the photovoltaic module supplies power to the inverter through the second branch. In addition, when the first branch is conducted and the second branch is disconnected, the storage battery can also supply power for the inverter.
According to the inverter circuit and the photovoltaic system, the conversion circuit is used for realizing connection of the photovoltaic module, the storage battery and the inverter, the storage battery can directly supply power to the inverter without a DC/DC converter, when the second branch is conducted, the photovoltaic module can directly supply power to the inverter without the DC/DC converter so as to reduce power supply loss, when the first branch is conducted, the photovoltaic module can supply power to the inverter and also can supply power to the storage battery, and in different states, the power of the photovoltaic panel can be controlled by the MPPT controller so as to adapt to different working environments, and the effect of utilizing photovoltaic energy with maximum efficiency is realized.
Illustratively, the inverter in the embodiments of the present application may be a micro-inverter. The first MPPT controller may be disposed on the inverter and electrically connected with the inverter, or the first MPPT controller may be independently disposed before the conversion circuit and the inverter and electrically connected with the inverter, or the first MPPT controller may be integrated in a control module of the inverter, and all used for controlling power output from the photovoltaic module to the inverter. In the photovoltaic system, the quantity of converting circuit is a plurality of, and a plurality of converting circuit's first end is used for connecting a photovoltaic module respectively, and same micro-inverter is connected to the second end of at least two converting circuit, and at least two converting circuit still are used for connecting same battery. The number of the photovoltaic modules is at least one and at most four, and each photovoltaic module is provided with a conversion circuit. When one photovoltaic module has the problems of local overheating and the like due to the speckle effect, other photovoltaic modules are not easy to influence, the whole short-plate effect of the photovoltaic system can be avoided, and the energy loss is reduced.
The switching circuit is connected with a first controller, the first controller is electrically connected with the storage battery, and the first controller is used for controlling the switching circuit to switch between a first state and a second state. The switching circuit is in a first state, the first branch is conducted, the second branch is disconnected, and when the switching circuit is in a second state, the first branch is disconnected, and the second branch is conducted. The second branch is provided with a control switch, and the first controller is configured to control the control switch to be closed so as to enable the second branch to be conducted. The control switch may be a single pole double throw switch, and when the control switch is configured to different positions, the control switch may correspond to a state in which the first branch is turned on and the second branch is turned off (a first state of the switching circuit), and a state in which the first branch is turned off and the second branch is turned on (a second state of the switching circuit), respectively.
Fig. 3 is a circuit diagram of a photovoltaic system according to an embodiment of the present application. Fig. 3 shows a part of the structure of the photovoltaic system, for explaining the structure and state change of the conversion circuit.
In fig. 3, two photovoltaic modules are provided, the input and output of which are denoted by PV1+, PV1-, PV2+ and PV2-, respectively, the conversion circuit comprising a first branch comprising a DC/DC converter, and a second branch, the DC/DC converters of the two photovoltaic modules being denoted by D11 and D12, respectively. And a second branch is provided with control switches (K1 and K2, respectively). When the second branch is conducted, the first branch is in a disconnected state, and the photovoltaic module cannot supply power to the micro-inverter through the first branch and cannot charge the storage battery B1. When the second branch is disconnected, the first branch may be turned on to power the micro-inverter through the first branch. In addition, the first branch is also connected to battery B1, and the photovoltaic module can charge battery B1 via a DC/DC converter. The storage battery B1 is also provided with a switch, the storage battery can be charged or discharged when the switch is opened, and the storage battery cannot be charged or discharged when the switch is opened.
Fig. 4 is a block diagram of a photovoltaic system according to an embodiment of the present application. The first controller connected to the conversion circuit may be an MCU, and the battery is connected to a Battery Management System (BMS), and the battery management system may collect battery information including voltage and electric quantity of the battery and send the battery information to the first controller, and the first controller obtains the battery electric quantity of the battery through the battery management system. In addition, the first controller can also acquire the current PV power of the photovoltaic module (the power generation power of the photovoltaic module), and is further used for controlling the conversion circuit to convert between the first state and the second state according to the battery power of the storage battery and the power generation power of the photovoltaic module, so that the photovoltaic module is suitable for different working condition environments. The first controller can be connected with the corresponding current sampler and the voltage sampler, so that the voltage and the current of the photovoltaic module are obtained through the sampler, and the power generation of the photovoltaic module is obtained through the voltage and the current. For the photovoltaic module, the generated power is mainly related to the illumination intensity, and the illumination intensity at the current moment can be obtained through the generated power. In addition, the first controller can also control the on and off of a switch on the storage battery, so as to control whether the storage battery is charged (discharged) or not.
The first branch is also connected with a second MPPT controller, and when the conversion circuit enters the first state, the second MPPT controller is turned on to control the output power of the photovoltaic module. And when the conversion circuit enters the second state, the second MPPT controller is closed. The micro-inverter is connected with a first MPPT controller, when a second MPPT controller is started, the first MPPT controller is closed, and when the second MPPT controller is closed, the first MPPT controller is started. The second MPPT controller and the first MPPT controller can detect the generating voltage of the photovoltaic module in real time and track the highest voltage current Value (VI) when working, so that the system outputs the maximum power, and the control of the output power of the photovoltaic module is realized.
Illustratively, in an embodiment of the present application, only one of the second MPPT controller and the first MPPT controller is engaged in operation at the same time. When the conversion circuit is in the second state, the second branch is conducted, the second MPPT controller is not involved in the work any more, and the control of output power can be realized through the first MPPT controller in the micro-inverter.
As shown in fig. 5, the working state table of the photovoltaic system under different working conditions is shown. The photovoltaic system is divided into four different states in the table.
After the battery power and the generated power of the photovoltaic module are obtained, the first controller compares the battery power with a set threshold value. For example, for the generated power, a first threshold value and a second threshold value are set, wherein the first threshold value is larger than the second threshold value. For the photovoltaic module, the generated power is mainly related to illumination intensity, and when the illumination is sufficient, the power of the photovoltaic module is larger than a first threshold value X1.
When the generated power is between the first threshold value and the second threshold value, namely the power of the photovoltaic module is 0-X1, the insufficient illumination is indicated. When the generated power is smaller than or equal to a second threshold value, the photovoltaic module is at night or the illumination intensity is extremely weak, and power supply is difficult, wherein the second threshold value can be 0. For the battery charge, a first charge threshold and a second charge threshold are set, where the first charge threshold may be represented by X2%, and when the battery charge is greater than the first charge threshold, it indicates that the battery charge is not empty. When the battery power is smaller than or equal to the first power threshold, the power of the battery is empty, and the battery cannot be discharged and can only be charged. To ensure the life of the battery, the first charge threshold is not set to 0%. The first power threshold may be set to a value between 2% and 10%, or may be adjusted according to usage habits or actual situations, and an appropriate first power threshold is adopted. When the battery charge is less than the second charge threshold, the battery is indicated as full, the second charge threshold may be 100%, and when the battery charge is equal to the second charge threshold, the battery is indicated as full, and no recharging is necessary.
When the conversion circuit is in the first state, the DC/DC converter operates. When in the second state, the photovoltaic module is connected to the micro-inverter through the second branch, and the DC/DC converter does not work.
Alpha in the table is the power distribution factor of the photovoltaic panel, and the value is 0-1. The larger the value of a is, the higher the power ratio of the output power of the photovoltaic module for charging the storage battery is. η represents the overall efficiency of inversion by the micro-inverter. The value of eta is 0-1, and in actual use, the value of eta is generally not 1 or 0. The battery power in the table refers to the power to charge or discharge the secondary battery. When the battery is full, the battery power is 0. When the illumination is insufficient and the electric quantity of the battery is low, the storage battery can be charged preferentially, and the battery power is the power generation power of the photovoltaic module. The inversion power represents the power converted by the micro-inverter, and is 0 when the photovoltaic module only charges the storage battery. When the storage battery is full, the photovoltaic module only supplies power for the inverter, and the inversion power is the product of the power generation power (PV power) and eta of the photovoltaic module.
The MPPT control refers to the state of a first MPPT controller connected with the micro-inverter, and only one of the second MPPT controller and the first MPPT controller participates in the work at the same time. When the conversion circuit is in the second state, the second branch is conducted, the second MPPT controller is not involved in the work any more, and the control of output power can be realized through the first MPPT controller in the micro-inverter. Similarly, when the second branch is disconnected, the first MPPT controller is started and enters into a working state.
Fig. 6 (a) -6 (d) are working states under different working conditions in the embodiment of the present application. The following describes the operation states under different working conditions with reference to fig. 5 and 6.
As shown in fig. 6 (a), the light is insufficient and the battery is not discharged. The first controller confirms that the generated power is between a first threshold and a second threshold, and the battery capacity is greater than the first capacity threshold, and the first controller is configured to control the switching circuit to enter a first state, the second branch is disconnected and the first branch is connected.
The photovoltaic assembly is configured to power the micro-inverter through the first branch, and the battery is configured to power the micro-inverter. The photovoltaic module supplies power to the micro-inverter through the DC/DC converter, and the storage battery can supply power to the inverter through the direct current bus.
In this state, the power of the photovoltaic module is between 0 and X1, and the electric quantity of the battery is greater than the first electric quantity threshold X2%. The battery power of the battery is the maximum dischargeable current. The inverter power in the micro-inverter is PV power η+ cell power.
Illustratively, the micro-inverter is connected with a plug-in terminal, so that a user can conveniently access the micro-inverter into a power grid or electric equipment.
As shown in fig. 6 (b), the photovoltaic module is at night and the battery is not empty. The first controller confirms that the generated power is not greater than the second threshold value, the battery capacity is greater than the first capacity threshold value, the first controller controls the conversion circuit to enter a first state, the first branch is conducted, and the second branch is disconnected. For example, when the generated power is not greater than the second threshold value, the condition that the photovoltaic module is at night or other illumination intensity is extremely weak, so that the photovoltaic module is difficult to supply power is indicated.
The photovoltaic assembly stops supplying power to the micro-inverter and the storage battery is configured to supply power to the micro-inverter. The photovoltaic module is difficult to supply power, only the storage battery can supply power to the micro-inverter, the storage battery can supply power without a DC/DC converter, and energy loss can be reduced.
In this state, the PV power is 0, the battery power is the maximum dischargeable current, the battery voltage, and the inverter power of the micro-inverter is the battery power.
As shown in fig. 6 (c), the photovoltaic module is in a state where the light is sufficient and the battery is not fully charged. When the first controller confirms that the generated power is larger than the first threshold value and the battery capacity is smaller than the second capacity threshold value, the first controller controls the conversion circuit to enter a first state. The first branch is on and the second branch is off.
The photovoltaic module is configured to supply power to the micro-inverter through the first branch and charge the storage battery through the first branch, wherein the electric quantity of the storage battery is smaller than a second electric quantity threshold value, and the electric quantity of the storage battery is indicated to be underfilled. That is, in this case the photovoltaic module both charges the battery through the DC/DC converter and supplies the micro-inverter.
In this state, the PV power is greater than X1 and the battery is not fully charged. The battery is in a charged state and the battery power is the minimum of PV power, maximum chargeable current, and battery voltage. The inverter power of the micro-inverter is PV power η -cell power.
As shown in fig. 6 (d), the illumination is sufficient and the battery is fully charged. When the generated power is greater than the first threshold and the battery power is equal to the second power threshold, the first controller is configured to control the conversion circuit to enter a second state, the second branch is conducted and the first branch is disconnected. A battery charge equal to the second charge threshold indicates that the battery has been charged.
The photovoltaic assembly is configured to power the micro-inverter through the second branch. Because the illumination is sufficient, the battery is not discharged, and because the battery is already full, no charging is required.
In this state, the PV power is greater than X1, and the battery is already full, so the power to charge the battery is 0. The inverter power of the micro-inverter is PV power η. At this time, the first MPPT controller is in an on state, and is configured to control power of the photovoltaic module.
In addition, when the light is insufficient and the battery power is insufficient (this state is not shown in fig. 6). The battery power is less than or equal to a first power threshold X2%. The PV power of the photovoltaic module is between 0 and X1. The electric quantity of the photovoltaic module is mainly used for charging a storage battery, and the power of the storage battery is PV power. The storage battery and the photovoltaic module do not supply power to the micro-inverter, and the inversion power of the micro-inverter is 0.
Based on the description above, in the photovoltaic system according to the embodiment of the present application, the conversion circuit is used to connect the photovoltaic module, the storage battery and the micro-inverter, the storage battery can directly supply power to the micro-inverter without passing through the DC/DC converter, when the conversion circuit is in the second state, the photovoltaic module can directly supply power to the micro-inverter without passing through the DC/DC converter, so as to reduce the power supply loss, and when the conversion circuit is in the first state, both the photovoltaic module and the storage battery can supply power to the micro-inverter. The system can adapt to different working environments, has different power supply modes under different working conditions, and can realize the effect of utilizing photovoltaic energy with maximum efficiency.
Fig. 7 is a logic diagram of voltage conversion in the photovoltaic system according to an embodiment of the present application. The figure illustrates the self-adaptive adjustment of voltage during the process of charging the storage battery by the photovoltaic module. Illustratively, the DC/DC converter of the present application adopts a Buck-Boost (Buck-Boost) converter, and the voltage adjustment process is as follows:
After the conversion circuit is powered on for the first time, the first controller detects an open circuit voltage vpv_ ocv of the photovoltaic module and an open circuit voltage vbatt_ ocv of the storage battery.
And judging whether the DC/DC enters a boost, buck or buck-boost concurrent mode according to the relation between Vpv_ ocv and Vbatt_ ocv, and calculating an initial duty ratio D. The threshold value of the preset Vbatt_ ocv is 0.7Vpv_ocv-1.3Vpv_ocv.
If the open-circuit voltage of the storage battery exceeds 1.3 times of the open-circuit voltage of the photovoltaic module, the voltage provided by the photovoltaic module is insufficient, and the voltage output by the photovoltaic module needs to be boosted. Otherwise, if the open-circuit voltage of the storage battery is smaller than 0.7 times of the open-circuit voltage of the photovoltaic module, the voltage provided by the photovoltaic module is too high in the specification, and the voltage output by the photovoltaic module needs to be reduced. So that the value of Vbatt can be between 0.9Vpv-1.1Vpv (the voltage output by the photovoltaic module after adjustment).
And based on the second MPPT controller, the duty ratio is adjusted to be D by utilizing an MPPT algorithm, so that the photovoltaic module can output the maximum power.
During operation, the battery voltage may change in real time, requiring real-time detection of Vpv and Vbatt for updating. Illustratively, if after adjustment, a situation in which Vbatt is not less than 1.2Vpv or not more than 0.8Vpv still occurs, adjustment needs to be performed again. And finally, the voltage of the photovoltaic module for charging the storage battery after DC/DC change is maintained within a proper range. The above-described predetermined threshold values of 0.9Vpv to 1.1Vpv and the like are examples. Can be adjusted according to the actual situation.
The embodiment of the application also provides electric equipment, which comprises the photovoltaic system.
According to the electric equipment provided by the embodiment of the application, the photovoltaic system is used for supplying power, the conversion circuit is used for realizing the connection of the photovoltaic module, the storage battery and the micro-inverter, the storage battery can directly supply power to the micro-inverter without passing through the DC/DC converter, when the conversion circuit is in the second state, the photovoltaic module can directly supply power to the micro-inverter without passing through the DC/DC converter so as to reduce the power supply loss, and when the conversion circuit is in the first state, the photovoltaic module and the storage battery can both supply power to the micro-inverter. Different working environments can be adapted, different power supply modes exist under different working conditions, and the effect of utilizing photovoltaic energy with maximum efficiency can be achieved.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above illustrative embodiments are merely illustrative and are not intended to limit the scope of the present application thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the application. All such changes and modifications are intended to be included within the scope of the present application as set forth in the appended claims.
The above description is merely illustrative of the embodiments of the present application and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are covered by the protection scope of the present application. The protection scope of the application is subject to the protection scope of the claims.
Claims (13)
1. An inverter circuit for an inverter is provided, which comprises a first inverter circuit, characterized by comprising the following steps:
The conversion circuit comprises a first branch and a second branch, wherein the first ends of the first branch and the second branch are connected to the photovoltaic module, a DC/DC converter is arranged on the first branch, and the second end of the first branch is also used for being connected to a storage battery;
the second ends of the first branch and the second branch are connected with the inverter, and the inverter is also used for being electrically connected with the storage battery;
The first MPPT controller is electrically connected with the inverter and used for controlling the power output by the photovoltaic module to the inverter;
If the first branch is conducted, the second branch is disconnected, and the photovoltaic assembly supplies power for the inverter and/or the storage battery through the first branch;
and if the first branch is disconnected, the second branch is conducted, and the photovoltaic component supplies power for the inverter through the second branch.
2. The inverter circuit of claim 1, wherein the switching circuit is connected to a first controller, the first controller being electrically connected to the battery, the first controller being configured to control the switching circuit to switch between a first state and a second state;
The switching circuit is in a first state, the first branch is connected, the second branch is disconnected, and the switching circuit is in a second state, the first branch is disconnected, and the second branch is connected.
3. The inverter circuit of claim 2, wherein the first controller is configured to control the switching circuit to switch between the first state and the second state based on a battery level of the storage battery and a generated power of the photovoltaic module.
4. The inverter circuit of claim 3, wherein the generated power is between a first threshold and a second threshold, and the battery level is greater than a first level threshold, the first controller is configured to control the first leg of the conversion circuit to be on and the second leg to be off;
The photovoltaic assembly is configured to power the inverter through the first branch, and the battery is configured to power the inverter.
5. The inverter circuit of claim 3, wherein the first controller controls the first leg of the conversion circuit to be on and the second leg to be off when the generated power is not greater than a second threshold and the battery level is greater than a first level threshold;
The photovoltaic assembly stops supplying power to the inverter, and the battery is configured to supply power to the inverter.
6. The inverter circuit of claim 3, wherein the first controller controls the first leg of the conversion circuit to be on and the second leg to be off when the generated power is greater than a first threshold and the battery level is less than a second level threshold;
The photovoltaic assembly is configured to power the inverter through the first branch and charge the battery through the first branch.
7. The inverter circuit of claim 6, wherein when the generated power is greater than a first threshold and the battery level is equal to the second level threshold, the first controller is configured to control the first leg of the conversion circuit to be off and the second leg to be on;
the photovoltaic assembly is configured to power the inverter through the second branch.
8. The inverter circuit of any of claims 1-7, wherein the first MPPT controller is disposed on and electrically connected to the inverter.
9. The inverter circuit of any one of claims 2-7, wherein a control switch is provided on the second leg, the first controller being configured to control the control switch to close to render the second leg conductive.
10. The inverter circuit of any of claims 2-7, wherein the first leg is further connected to a second MPPT controller, the first MPPT controller is turned off and the second MPPT controller is turned on to control the output power of the photovoltaic module when the conversion circuit enters the first state, and the first MPPT controller is turned on and the second MPPT controller is turned off when the conversion circuit enters the second state.
11. The inverter circuit of any one of claims 1-7, wherein the number of the conversion circuits is plural, first ends of the plural conversion circuits are each for connecting one of the photovoltaic modules, second ends of at least two of the conversion circuits are connected to the same inverter, and at least two of the conversion circuits are also for connecting the same battery.
12. A photovoltaic system, characterized in that the system comprises a photovoltaic module, a battery and an inverter circuit according to any one of claims 1-11.
13. A powered device comprising the photovoltaic system of claim 12.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202323632971.1U CN222147556U (en) | 2023-12-28 | 2023-12-28 | Inverter circuit, photovoltaic system and electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202323632971.1U CN222147556U (en) | 2023-12-28 | 2023-12-28 | Inverter circuit, photovoltaic system and electric equipment |
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| CN222147556U true CN222147556U (en) | 2024-12-10 |
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| CN202323632971.1U Active CN222147556U (en) | 2023-12-28 | 2023-12-28 | Inverter circuit, photovoltaic system and electric equipment |
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