CN213717616U - Energy storage inverter - Google Patents
Energy storage inverter Download PDFInfo
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- CN213717616U CN213717616U CN202022921499.3U CN202022921499U CN213717616U CN 213717616 U CN213717616 U CN 213717616U CN 202022921499 U CN202022921499 U CN 202022921499U CN 213717616 U CN213717616 U CN 213717616U
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Abstract
The application discloses energy storage inverter contains the body, disposes in this internal control module group, first delivery outlet and second delivery outlet, and first delivery outlet configuration is incorporated into the power networks the delivery outlet, and the second delivery outlet configuration is from the net delivery outlet, and control module group contains: the device comprises a sampling module, a processor module, a conversion circuit and a plurality of relay switches; the switching circuit is electrically connected to the first output port and the second output port and outputs electric energy to the first output port or the second output port based on the instruction energy storage inverter, the relay switch is electrically connected with the processor module respectively and acts based on an instruction of the processor module, the sampling module is used for being electrically connected with a power grid to sample signals of the power grid and transmit the sampled signals to the processor module, the processor module receives and responds to the sampled signals to control the electric connection switching circuit and control the electric connection relay and trigger part of the relay, and the switching circuit receives and responds to the instruction of the processor module to operate, so that the power supply requirement under grid connection/off-grid is met.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to an energy storage inverter.
Background
In order to ensure the electricity safety and prevent electric shock, the energy storage inverter is in an off-grid mode, an off-grid side N line (EpsN) is necessarily connected to a ground line PE, an N line of an off-grid port and an N line of a grid-connected side port inside the inverter are connected together, however, the grid-connected side N line (GridN) is not allowed to be in short circuit with the ground line PE in the grid-connected mode, and otherwise, the leakage protector is tripped. In the conventional method, a relay is added on an off-grid side N line (EpsN), one end of the relay is connected with the EpsN, the other end of the relay is connected with a ground wire PE (shown in figure 1), when an off-grid condition occurs, the off-grid N line (EpsN) and the PE line are automatically connected, and the relay is disconnected in a grid-connected mode. However, this method requires an additional relay, and the circuit is complicated, has low reliability, and requires additional cost.
Therefore, there is a need for a new tank inverter that reduces circuit complexity while improving system reliability.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above disadvantages, the present application aims to provide a new energy storage inverter, which simplifies the circuit topology and has a simple control method for connecting the N-line and the PE-line.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the utility model provides an energy storage inverter, its characterized in that includes the body, disposes the control module group in this body, first delivery outlet and second delivery outlet, first delivery outlet configuration is incorporated into the power networks the delivery outlet, the second delivery outlet configuration is from the net delivery outlet, the control module group contains: the device comprises a sampling module, a processor module, a conversion circuit and a plurality of relay switches; the conversion circuit is electrically connected to the first output port and the second output port respectively, and outputs electric energy to the first output port or the second output port based on the instruction,
the plurality of relay switches are respectively electrically connected with the processor module and act based on instructions of the processor module, the sampling module is used for electrically connecting signals of a power grid sampling power grid and transmitting the sampled signals to the electrically connected processor module, the processor module receives and responds to the sampling signals fed back by the sampling module to control the electrically connected switching circuit and the electrically connected relay and trigger part of the relay, and the switching circuit receives and responds to instructions of the processor module to operate. The first output port and the second output port are arranged on the body.
Preferably, the first output port includes a first end (a) for electrically connecting to the L-end of the utility power, a second end (b) for electrically connecting to the N-end (Grid-N) of the utility power, the conversion circuit is an inverter circuit, and a fifth relay S5 and a sixth relay S6 are electrically connected in series with the first end (a), and a seventh relay S7 and an eighth relay S8 are electrically connected in series with the second end (b).
Preferably, the second outlet comprises:
the third end (c) is used for being electrically connected to the L end of the off-grid side, the fourth end (d) is used for being electrically connected to the N end of the off-grid side, a first relay S1 and a second relay S2 are electrically connected between the third end (c) and the inverter circuit in series, a third relay S3 and a fourth relay S4 are electrically connected between the fourth end (d) and the inverter circuit in series, and the connecting point of the third relay S3 and the fourth relay S4 is electrically grounded PE.
Preferably, the energy storage inverter is characterized in that the first output port and the second output port are integrated into one connecting end or are connected to a matched connecting head through cable leads.
Preferably, the sampling module comprises a current sensor or a current transformer, which is electrically connected to the utility power and the processor module.
The embodiment of the present application further provides a method for controlling an energy storage inverter, which is characterized by comprising the above energy storage inverter,
the control method comprises the following steps that when the energy storage inverter is in a grid-connected mode:
the processor module samples the power grid signals based on the sampling module, continuously samples the power grid signals of N periods, and if the power grid signals are not detected in the N periods, the processor module sends out an instruction to stop, the conversion circuit receives and responds to the instruction of the processor module to stop feeding power to the power grid, and simultaneously disconnects the fifth relay S5, the sixth relay S6, the seventh relay S7 and the eighth relay S8, and exits the grid-connected mode.
Preferably, the control method further comprises, after exiting the grid-tie mode,
the processor module of the energy storage inverter sends out a command to control the first relay S1, the second relay S2, the third relay S3 and the fourth relay S4 which are electrically connected with the processor module to be closed, and the energy storage inverter enters an off-grid mode.
Preferably, when the energy storage inverter is in the off-grid mode, the control method includes:
the processor module samples the power grid signals based on the sampling module, continuously samples the power grid signals of N periods, and if the power grid signals can be detected in the N power grid periods, the processor module sends an instruction to stop outputting 220V voltage to the off-grid port, and simultaneously disconnects the relays S1, S2, S3 and S4 to stop the off-grid mode;
then the processor module sends out commands to control the relays S5, S6, S7 and S8 to be closed, and the grid-connected mode is entered.
Preferably, in the control method, N is greater than 1.
Preferably, in the control method, N is 5.
Advantageous effects
The present application proposes providing an energy storage inverter that can be operated satisfactorily while reducing one relay (relay switch), thus simplifying the control strategy. And simultaneously optimizing and controlling the layout of the components on the module. Providing overall reliability of the system.
Drawings
Fig. 1 is an equivalent schematic diagram of the connection of N lines and PE lines of a conventional energy storage inverter;
FIG. 2 is an equivalent schematic diagram of the connection of the N line and the PE line of the energy storage inverter according to the embodiment of the present application;
fig. 3 is a schematic diagram of a control module according to an embodiment of the present application.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present application. The conditions employed in the examples may be further adjusted as determined by the particular manufacturer, and the conditions not specified are typically those used in routine experimentation. The embodiment of the application provides an energy storage inverter, it contains first delivery outlet, the second delivery outlet, wherein first delivery outlet is the delivery outlet that is incorporated into the power networks, the second delivery outlet is for being separated from the network delivery outlet, converting circuit, it is first delivery outlet of electric connection respectively, the second delivery outlet is based on the instruction to first delivery outlet or second delivery outlet electric energy, this internal control module group that disposes of energy storage inverter, this control module group contains, sampling module, processor module, converting circuit, relay switch. The sampling module is electrically connected with a power grid (commercial power) to sample a power grid signal and transmit the power grid signal to a processor module (such as a processor) electrically connected with the sampling module, the processor module receives and responds to the sampling signal to control an electrically connected conversion circuit to operate, the conversion circuit receives and responds to instructions of the processor module to operate (such as operating in a grid-connected mode and an off-grid mode), and the processor module controls a relay electrically connected with the processor module and triggers part of the relay while sending instructions to the conversion circuit so that the power supply requirement under the grid-connected/off-grid conditions is met. In the embodiment, the grid-connected mode and the grid-disconnected mode do not exist simultaneously, the grid-disconnected relay is disconnected during grid-connected work, and the grid-connected relay is disconnected during grid-disconnected mode. The grid-connected mode means that the energy storage inverter is electrically connected to the commercial power, and the off-grid mode means that the energy storage inverter is not electrically connected to the commercial power. The first output port and the second output port are arranged on the body.
Fig. 2 is a diagram illustrating a control method for connection of the N line and the PE line in the grid-connected mode and the off-grid mode.
As shown in fig. 2, which is an equivalent schematic diagram of connection between the N line and the PE line of the energy storage inverter according to the embodiment of the present invention, when the energy storage inverter is in the off-grid mode, the relay S1, the relay S2, the relay S3, and the relay S4 are closed, the relay S5, the relay S6, the relay S7, and the relay S8 are opened, and the N line (EpsN) is automatically connected to the ground PE.
When the off-grid mode is left and the grid-connected mode is entered, the relay S1, the relay S2, the relay S3 and the relay S4 are opened, the relay S5, the relay S6, the relay S7 and the relay S8 are closed, and the grid-connected N line (GridN) is automatically disconnected from the ground PE.
According to the mechanism of the control method of the embodiment, a processor module of an energy storage inverter samples grid signals in a grid-connected mode, when a grid is powered off, the processor module continuously samples the grid signals in 5 periods, if the grid signals are not detected in the 5 grid periods all the time, a CPU (processor) judges that the grid is powered off, the CPU sends an instruction to stop feeding power to the grid (the current is output by the inverter when the grid is fed), and simultaneously, relays S5, S6, S7 and S8 are turned off to stop the grid-connected mode; then, the inverter control circuit is switched (the inverter is connected with the grid to output current, and the inverter outputs voltage when the grid is disconnected), and the relays S1, S2, S3 and S4 are closed, so that the inverter outputs 220V alternating current voltage to the grid disconnection port, and the grid disconnection mode is started. In the present embodiment, 5 sampling periods are adopted, and in other embodiments, N sampling periods are adopted, where N is greater than 1 (which is likely to be misjudged when 1 is adopted), such as 2, 3, 4, and 6. In other embodiments, 380V may also be used.
Under an off-grid mode, the processor module samples a power grid signal, when the power grid is powered on, the processor module continuously samples the power grid signal for 5 periods, if the power grid signal can be detected in 5 power grid periods, the processor module judges that the power grid is electrified, the processor module sends an instruction at the moment, the output of 220V voltage to an off-grid port is stopped, and meanwhile, the relays S1, S2, S3 and S4 are disconnected, and the off-grid mode is stopped; then, the control circuit in the inverter is switched, and the relays S5, S6, S7 and S8 are closed, so that the inverter is fed (outputs a current signal) to the grid, and the grid connection mode is entered.
The energy storage inverter of the present embodiment includes a first output port, the first output port includes a first end a for electrically connecting to a terminal L (Grid-L) of the utility power, a second end b for electrically connecting to a terminal N (Grid-N) of the utility power, the first end and the inverter circuit have a fifth relay S5 and a sixth relay S6 electrically connected in series, the second end b and the inverter circuit have a seventh relay S7 and an eighth relay S8 electrically connected in series.
The second output port includes a third terminal c for electrically connecting to an L terminal (EPS-L) on the EPS side (off-grid side), a fourth terminal d for electrically connecting to an N terminal (EPS-N) on the EPS side, a first relay S1 and a second relay S2 electrically connected in series between the third terminal c and the inverter circuit, and a third relay S3 and a fourth relay S4 electrically connected in series between the fourth terminal S and the inverter circuit. The connection point of the third relay S3 and the fourth relay S4 is electrically grounded PE. Preferably, the first output port and the second output port are integrated on a connecting end or connected through a cable lead and then through a matched connector. The first output port and the second output port are arranged on the body.
As shown in fig. 3, which is a schematic diagram of a control module, the control module is disposed in the body of the energy storage inverter. The device comprises a sampling module, a processor module, a conversion circuit and 8 relay switches. The sampling module is a processor module (such as a processor) which is electrically connected with a power grid (commercial power) to sample power grid signals and transmit the sampled signals, the processor module receives and responds to the sampled signals to control the operation of an electrically connected conversion circuit, the conversion circuit receives and responds to instructions of the processor module to operate (such as operating in a grid-connected mode and an off-grid mode), and 8 relays (S1-S8) which control the electrical connection of the processor module are triggered to meet the power supply requirements of grid connection or off-grid in the S5-S8 closing mode and the S1-S4 closing mode. In the embodiment, the grid-connected mode and the grid-disconnected mode do not exist simultaneously, the grid-disconnected relay is disconnected during grid-connected work, and the grid-connected relay is disconnected during grid-disconnected mode. The sampling module contains a current sensor or transformer to detect the electrical signal on the utility side. Of course, the control module may also include other existing modules, such as a communication module, a metering module, and the like. Compared with the existing energy storage inverter, the embodiment can meet the operation requirement when one relay (relay switch) is reduced, and therefore the control strategy is simplified. And simultaneously optimizing and controlling the layout of the components on the module. Providing overall reliability of the system. The control module comprises a Bluetooth module, a processor module and a control module, wherein the Bluetooth module is configured on a circuit board of the control module, is electrically connected with the processor module and is used for being connected with an intelligent terminal or a local route, so that the intelligent terminal (such as a computer) is connected to the control module through the Bluetooth module for operation during field maintenance or upgrading.
In the above embodiment, the first relay S1 is also abbreviated as S1, the second relay S2 is abbreviated as S2, the third relay S3 is abbreviated as S3, the fourth relay S2 is abbreviated as S4, the fifth relay S5 is abbreviated as S5, the sixth relay S6 is abbreviated as S6, the seventh relay S7 is abbreviated as S7, and the eighth relay S8 is abbreviated as S8.
In the present application, the terms "upper", "lower", "inside", "middle", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
The above embodiments are merely illustrative of the technical concepts and features of the present application, and the purpose of the embodiments is to enable those skilled in the art to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the present application are intended to be covered by the scope of the present application.
Claims (6)
1. An energy storage inverter, comprising: the body is provided with a plurality of grooves,
a control module arranged in the body, a first output port and a second output port,
the first delivery outlet configuration is incorporated into the power networks the delivery outlet, the second delivery outlet configuration is from the net delivery outlet, the control module group contains: the device comprises a sampling module, a processor module, a conversion circuit and a plurality of relay switches; the conversion circuit is electrically connected to the first output port and the second output port respectively, and outputs electric energy to the first output port or the second output port based on the instruction,
the plurality of relay switches are respectively and electrically connected with the processor module, act based on the instruction of the processor module, the sampling module is used for electrically connecting the electric network to sample the signal of the electric network and transmitting the sampled signal to the electrically connected processor module,
the processor module receives and responds to the sampling signal fed back by the sampling module to control the electric connection switching circuit and the relay which is electrically connected with the sampling module and trigger part of the relay, and the switching circuit receives and responds to the instruction operation of the processor module.
2. The energy storage inverter of claim 1,
the first outlet includes:
a first terminal (a) for electrically connecting to the L terminal of the utility power,
a second terminal (b) for electrically connecting to the N-terminal (Grid-N) of the utility power,
the conversion circuit is an inverter circuit, and a fifth relay S5 and a sixth relay S6 which are electrically connected in series are arranged between the conversion circuit and the first end (a), and a seventh relay S7 and an eighth relay S8 which are electrically connected in series are arranged between the conversion circuit and the second end (b).
3. The energy storage inverter of claim 2, wherein the second output port comprises:
a third terminal (c) for electrically connecting to the L terminal of the off-grid side,
a fourth terminal (d) for electrically connecting to the N terminal of the off-grid side,
and a first relay S1 and a second relay S2 which are electrically connected in series are arranged between the third end (c) and the inverter circuit, a third relay S3 and a fourth relay S4 which are electrically connected in series are arranged between the fourth end (d) and the inverter circuit, and the connection point of the third relay S3 and the fourth relay S4 is electrically grounded.
4. An energy storage inverter according to claim 3, wherein the first output port and the second output port are integrated into a connection terminal or are connected to a matching connection terminal by cable leads.
5. The energy storage inverter of claim 1, wherein the sampling module comprises a current sensor or a current transformer electrically connected to the utility power and the processor module.
6. The energy storage inverter of claim 1, wherein the control module comprises a bluetooth module, the bluetooth module is disposed on a circuit board of the control module, and the bluetooth module is electrically connected to the processor module and the bluetooth module is used for connecting to an intelligent terminal or a local router.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020201861333 | 2020-02-19 | ||
| CN202020186133 | 2020-02-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213717616U true CN213717616U (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022921499.3U Active CN213717616U (en) | 2020-02-19 | 2020-12-08 | Energy storage inverter |
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| Country | Link |
|---|---|
| CN (1) | CN213717616U (en) |
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2020
- 2020-12-08 CN CN202022921499.3U patent/CN213717616U/en active Active
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