TWM519355U - Grid-connected power supply system - Google Patents

Description

Grid-connected power supply system

This creation is about a grid-connected power supply system, especially a grid-connected power supply system that supplies a variety of power to the load.

As governments have gradually promoted the solar power industry, solar power inverters have been widely used in large-scale power stations or solar power systems for home use. The grid-connected power supply system includes a battery module with energy storage. Therefore, the grid-connected power supply system realizes the inversion of the solar energy during the day to supply power to the household. On the other hand, the energy of excess power is stored in the battery module. At night, the battery module can also store stored energy through the grid-connected power supply system to supply power to the household load.

However, conventional grid-connected power supply systems tend to preferentially supply the energy of solar power to the load, and the excess energy will be fed back to the utility grid, and the excess power cannot be stored in the battery module; or conventionally known The grid-connected power supply system often uses two or more inverter conversions to store excess power into the battery module, thereby causing loss or waste of power conversion; or the conventional battery inverter is hung in the mains On the power grid, the utility power is used to convert the inverter into power for charging the battery module, thereby causing waste of power or reducing the use efficiency of the power. As a result, the conventional grid-connected power supply system often causes inconvenience in people's use.

The present invention provides a grid-connected power supply system for converting solar power into power for charging a battery module or discharging a battery module through a DC conversion module. The power is converted to the inverter module for use, thereby improving the usability of the grid-connected power supply system.

The present invention provides a grid-connected power supply system, which is suitable for powering a solar power stored by a solar energy storage module, a battery power outputted by a battery module, and a utility power grid to supply power to a load. The grid-connected power supply system includes: an electric meter module, a continuous current conversion module and an inverter module. The meter module is electrically connected to the mains and the load. The DC conversion module is electrically connected to the battery module and the solar energy storage module. The inverter module is electrically connected to the solar energy storage module, the DC conversion module, the meter module and the load. Wherein, the DC conversion module detects the presence of solar power and detects that a surplus power flows through the meter module, and one of the first power of the solar power is inverted by the inverter module to supply power to the load, one of the solar power The second power is converted into a charging power by the DC conversion module to charge the battery module.

The specific means of this creation is to utilize a grid-connected power supply system in which solar power is charged through a DC conversion module to charge the battery module. Furthermore, since the position of the DC conversion module is the solar power terminal, the voltage of the solar power is detected to obtain the working information of the grid-connected portion, so that the automatic control of the entire system is realized. In this way, the embodiment does improve the usability of the grid-connected power supply system.

In order to further understand the features and technical contents of this creation, please refer to the following detailed description and drawings of this creation, but these descriptions and drawings are only used to illustrate this creation, not the right to this creation. The scope is subject to any restrictions.

1, 1a, 1b, 1c‧‧‧ grid-connected power supply system

10‧‧‧Electrical Module

100‧‧‧Detection circuit

12‧‧‧DC conversion module

120‧‧‧Control circuit

122‧‧‧ buck-boost conversion circuit

124‧‧‧Detection circuit

14‧‧‧Inverter Module

SP‧‧‧Solar power

P1‧‧‧First Power

P2‧‧‧second power

CP‧‧‧Charging power

DP‧‧‧Battery power

T1‧‧‧ transmission line

DL‧‧‧ DC load

IT‧‧‧Inverter

B1‧‧‧ battery module

E1‧‧‧Power

S1‧‧‧Solar power storage module

L1‧‧‧ load

FIG. 1 is a schematic diagram of a grid-connected power supply system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the operation of the grid-connected power supply system according to another embodiment of the present invention.

FIG. 3 is a schematic diagram of the operation of a grid-connected power supply system according to another embodiment of the present invention.

4 is a schematic diagram of a grid-connected power supply system according to another embodiment of the present invention.

FIG. 5 is a schematic diagram of a grid-connected power supply system according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of a grid-connected power supply system according to another embodiment of the present invention.

FIG. 1 is a schematic diagram of a grid-connected power supply system according to an embodiment of the present invention. Please refer to Figure 1. A grid-connected power supply system 1 is adapted to supply a solar power stored by a solar energy storage module S1, a battery power outputted by a battery module B1, and a utility power E1 to be connected to a load L1.

In practice, the solar energy storage module S1 is realized by, for example, one or a combination of a solar panel, a controller, and a solar energy storage device. Among them, the solar panel is used to receive light energy. Solar energy storage devices are used to convert light energy into electrical energy. The controller controls the energy output by the solar energy storage device to the inverter through maximum power tracking, wherein the maximum power tracking is to detect which time period of the sunlight or which angle has the maximum power storage efficiency. The battery module B1 includes, for example, at least one battery, a lead storage battery, a lithium battery, or a rechargeable battery. This embodiment does not limit the aspects of the solar energy storage module S1 and the battery module B1.

In detail, the grid-connected power supply system 1 includes an electric meter module 10, a continuous current conversion module 12, and an inverter module 14. In practice, the meter module 10 is electrically connected between the mains E1 and the load L1. The DC conversion module 12 is electrically connected between the battery module B1, the solar energy storage module S1, and the inverter module 14. The inverter module 14 is electrically connected to the DC conversion module 12, the solar energy storage module S1, the meter module 10, and the load L1.

The meter module 10 is electrically connected to the mains E1 and the load L1. In practice, the meter module 10 is realized, for example, by a mechanical electric meter, an electronic electric meter, a three-phase mechanical electric meter, a three-phase electronic electric meter, or a smart electric meter. Compared with electronic meters, smart meters have the functions of communication meter reading, real-time information, quality monitoring, remote control and remote firmware update. The meter module 10 measures the power, current, voltage and current directions on the mains E1 grid through a detection circuit. This embodiment does not limit the aspect of the meter module 10.

It is worth mentioning that the meter module 10 transmits a transmission line T1 and a DC conversion mode. Group 12 communication, transmission line T1 is a full-duplex or half-duplex communication line. In detail, the transmission line T1 has, for example, an RS-485 interface, thereby realizing half-duplex communication; or the transmission line T1 has, for example, a JAN interface, thereby realizing full-duplex communication. In other embodiments, the meter module 10 and the DC conversion module 12 can also be implemented by wireless communication. For example, the meter module 10 transmits information of excess power to the DC conversion module 12 through a GPRS communication system, a GSM communication system, wifi or other radio frequency communication. This embodiment does not limit the communication between the meter module 10 and the DC conversion module 12.

The DC conversion module 12 is electrically connected to the battery module B1 and the solar energy storage module S1. In practice, the DC conversion module 12 is implemented by, for example, one or a combination of a DC-DC conversion circuit, a buck-boost conversion circuit, a boost circuit, and a step-down circuit. The DC conversion module 12 is configured to convert the solar power into a power that can charge the battery module B1, or to convert the battery power into a power that can be supplied to the inverter module 14 for inverter use. This embodiment does not limit the aspect of the DC conversion module 12.

Generally, the conventional grid-connected power supply system is electrically connected between the meter module 10 and the load L1 by a battery inverter, and the battery inverter is not electrically connected to the solar power storage module S1 of the embodiment. And the inverter module 14. When the solar energy storage module S1 generates a large amount of solar power, the inverter module 14 inverts and supplies a large amount of power to the load L1. If the load L1 does not completely consume all the power inverted by the inverter module 14, the excess power will flow to the power grid of the mains E1 or flow to the meter module 10. Therefore, the conventional grid-connected power supply system inverts excess power into DC power through a battery inverter and charges the battery module B1.

Because the conventional grid-connected power supply system passes the secondary inverter conversion (primary inverter module 14 and primary battery inverter), the power conversion efficiency is not high, the power consumption is lost, the power is wasted, or the battery module is elongated. Group B1 charging time. However, in this embodiment, when the design of the DC conversion module 12 is substituted for the conventional battery inverter so that the meter module 10 detects excess power, a portion of the solar power will pass through the DC conversion module 12 . It is converted into charging power for charging the battery module B1. Therefore, this embodiment can reduce the excess power flow to the power grid of the mains E1, and reduce the power consumption loss and increase The efficiency of charging the battery module B1.

In addition, the conventional battery inverter cannot know the information of the solar energy storage module S1. Therefore, the battery inverter cannot know whether the inverter module 14 is operating, and thus it is impossible to judge when the battery module B1 is charged and the battery module B1 is discharged. Therefore, the conventional grid-connected power supply system cannot fully realize automatic control. Moreover, the conventional battery inverter is hung on the power grid of the mains E1. Actually, the electric energy stored in the battery module B1 may be from the electric energy of the mains E1, not the excess electric power. However, the present embodiment can overcome the above problems through the DC conversion module 12, so as to achieve fully automatic control, and the unpredictable effect of charging the battery module B1 without using the mains E1.

The inverter module 14 is electrically connected to the solar energy storage module S1, the DC conversion module 12, the meter module 10, and the load L1. In practice, the inverter module 14 is implemented, for example, by a grid-connected inverter, a full-bridge inverter, or a half-bridge inverter. The inverter module 14 is configured to convert direct current into alternating current and provide alternating current power to the load L1. For example, the inverter module 14 is a grid-connected inverter, and the grid-connected inverter inverts the solar power to supply the load L1. When the power supply is greater than the power consumed by the load L1, the grid-connected inverter will overflow. Excess power to the grid of the mains E1. This embodiment does not limit the aspect of the inverter module 14.

Based on the above, when the inverter module 14 inverts power supply to the load L1 and overflows excess power to the power grid of the commercial power E1. That is, when the DC conversion module 12 detects the presence of solar power and detects that an excess power flows through the meter module 10, one of the first powers of the solar power is inverted via the inverter module 14 to supply power to the load. L1. One of the solar power, the second power, is converted into a charging power by the DC conversion module 12 to charge the battery module B1.

The DC conversion module 12 detects that the solar power cannot meet the operation of the inverter module 14, and when the battery module B1 meets the discharge condition, the battery power output by the battery module B1 and the battery power are converted into the DC power through the DC conversion module 12. The DC power is inverted via the inverter module 14 to supply power to the load L1. In other words, when there is no sunlight, the sunlight is weak, or the solar panel receives weak light energy, the battery module B1 and the straight The flow conversion module 12 will be in the discharge mode, and output DC power to the inverter module 14 via the DC conversion module 12, whereby the inverter module 14 can invert the output AC power to the load L1.

Next, the operation of the grid-connected power supply system 1 will be further explained.

FIG. 2 is a schematic diagram of the operation of the grid-connected power supply system according to another embodiment of the present invention. FIG. 3 is a schematic diagram of the operation of a grid-connected power supply system according to another embodiment of the present invention. Please refer to Figure 2 and Figure 3. FIG. 2 is a diagram showing the operation of the grid-connected power supply system 1 when the solar power SP is sufficient and the power of the mains E1 has excess power.

In detail, when the meter module 10 detects excess power, the meter module 10 transmits the transmission line T1 to notify the DC conversion module 12 so that the DC conversion module 12 and the battery module B1 are in the charging mode. Therefore, the solar power SP will be branched into the first power P1 and the second power P2. The first power P1 flows through the inverter module 14 and is inversely converted to supply power to the load L1. The second power P2 flows through the DC conversion module 12 and is converted to the battery module B1 by buck-boost conversion. Therefore, part of the solar power SP will be directly converted into the charging power CP for charging the battery module B1, thereby reducing the generation of excess power on the grid of the mains E1.

It is worth mentioning that when there is less excess power on the grid of the mains E1, the solar power SP can split the smaller second power P2 to charge the battery module B1. Similarly, when the power supply of the mains E1 has a large excess power, the solar power SP can split the larger second power P2 to charge the battery module B1. That is to say, when the excess power is larger, the second power P2 is larger, thereby reducing the generation of excess power on the power grid of the mains E1, or reducing the excess power to a predetermined value or less.

Next, FIG. 3 illustrates the operation of the grid-connected power supply system 1 when the solar power SP is insufficient or there is no solar power SP. When there is no sunlight, the sunlight is weak, or the solar panel receives weak light energy, the DC conversion module 12 detects that the solar power SP cannot satisfy the operation of the inverter module 14, and the battery module B1 satisfies the discharge condition. Therefore, the battery module B1 and the DC conversion module 12 are in the discharge mode, and output DC power to the inverter module 14 via the DC conversion module 12, whereby the inverter module 14 can invert the output AC power to the load L1. .

It can be seen that, compared with the conventional grid-connected power supply system, the solar power SP of the present embodiment is charged by the DC conversion module 12 to charge the battery module B1. Moreover, the conversion efficiency of the DC conversion module 12 can be made higher than that of the conventional battery inverter. Therefore, the overall efficiency of the grid-connected power supply system 1 of the present embodiment is improved.

The position of the DC conversion module 12 is between the solar energy storage module S1 and the inverter module 14. Therefore, by detecting the voltage of the solar power SP to obtain the working information of the grid-connected portion, automatic control of the entire system is realized. In addition, the DC conversion module 12 of the present embodiment is relative to a conventional DC-AC converted battery inverter. The DC conversion module 12 is simpler in design and lower in cost, thereby making the grid-connected power supply system 1 have a better competitive advantage.

Further, the detailed circuit of the grid-connected power supply system of the embodiment.

4 is a schematic diagram of a grid-connected power supply system according to another embodiment of the present invention. Please refer to Figure 4. The meter module 10 transmits a detection circuit 100 to detect excess power. In practice, the detection circuit 100 is, for example, a measurement circuit that measures the flow of current, electricity, voltage or current on the grid of the mains E1. This embodiment does not limit the aspect of the detecting circuit 100.

In addition, the DC conversion module 12 includes a control circuit 120, a buck-boost conversion circuit 122, and a detection circuit 124. In practice, the control circuit 120 is electrically connected to the buck-boost conversion circuit 122. The buck-boost conversion circuit 122 is electrically connected between the battery module B1, the solar energy storage module S1, and the inverter module 14. The detecting circuit 124 is electrically connected to the control circuit 120 and the solar power storage module S1. This embodiment does not limit the aspect of the DC conversion module 12.

The control circuit 120 is configured to control the buck-boost conversion circuit 122 and the battery module B1. Charging operation or discharge operation. That is, the control circuit 120 is used to control the on or off of the switches in the buck-boost conversion circuit 122 to enable the power to flow in both directions. For example, the electric power flows from the solar energy storage module S1 through the buck-boost conversion circuit 122, and then flows to the battery module B1; or the electric power flows from the battery module B1 through the buck-boost conversion circuit 122, and then flows to the solar energy storage module S1.

In addition, the detection circuit 124 is used to detect the presence of solar power or the voltage, current or other parameters of the solar power. The detection circuit 124 is, for example, a measurement circuit that detects the current, the amount of electricity, and the voltage of the solar energy storage module S1. The detecting circuit 124 detects that the solar power cannot satisfy the operation of the inverter module 14, and the battery module B1 outputs the battery power when the battery module B1 meets the discharging condition. The battery power is converted into DC power through the buck-boost conversion circuit 122 of the DC conversion module 12, and the DC power is inverted via the inverter module 14 to supply power to the load L1. This embodiment does not limit the aspects of the control circuit 120 and the detection circuit 124. The rest are the same and will not be repeated here.

FIG. 5 is a schematic diagram of a grid-connected power supply system according to another embodiment of the present invention. Please refer to Figure 5. 5 is similar to the grid-connected power supply system 1b, 1 in FIG. 1, and the same components that are included in the following are denoted by the same reference numerals. The difference between the grid-connected power supply systems 1b and 1 is that the grid-connected power supply system 1b further includes the DC load DL.

In practice, the DC load DL is electrically connected to the DC conversion module 12. The DC conversion module 12 is used to supply power to the DC load DL. The DC load DL, for example, consumes a DC load. The DC load DL is, for example, an LED lamp, a fan or other DC device. This embodiment does not limit the aspect of the DC load DL. The rest are the same and will not be repeated here.

FIG. 6 is a schematic diagram of a grid-connected power supply system according to another embodiment of the present invention. Please refer to Figure 6. 6 is similar to the grid-connected power supply system 1c, 1 in FIG. 1, and the same components as those included in the following are denoted by the same reference numerals. Grid-connected power supply The difference between the two systems 1c and 1 is that the grid-connected power supply system 1c further includes an inverter IT. In practice, the inverter IT is electrically connected to the DC conversion module 12. The DC conversion module 12 is configured to supply power to the inverter IT for power inverter conversion. The inverter IT is realized, for example, by a full bridge inverter or a half bridge inverter. This embodiment does not limit the aspect of the inverter IT.

That is to say, the DC conversion module 12 can store electrical energy outside the battery module B1. At the same time, the design of the DC conversion module 12 can be extended to realize the DC voltage output to the DC load DL or the inverter IT, thereby meeting diverse energy storage requirements. The rest are the same and will not be repeated here.

In summary, the present invention provides a grid-connected power supply system that obtains the working information of the grid-connected portion through a DC conversion module located at the solar power terminal. Moreover, the DC conversion module is not hung on the mains power grid, and the solar power is charged by the DC conversion module to charge the battery module. That is to say, the grid-connected power supply system of the present embodiment overcomes the "incomplete automation control" of the conventional grid-connected power supply system, "charges the battery module using power from the utility power", and "cannot determine when the battery module is being used. Problems such as charging and timing of battery module discharge. In this way, the present embodiment achieves the unpredictable effects of "fully implementing automatic control", "reducing the loss of secondary power conversion", and "charging the battery module without using the commercial power."

The above description is only an embodiment of the present invention, and is not intended to limit the scope of patent protection of the present invention. Anyone who is familiar with the art of the artist, within the spirit and scope of the creation, the equivalent of the change and retouching is still within the scope of the patent protection of the creation.

1‧‧‧Grid-connected power supply system

10‧‧‧Electrical Module

12‧‧‧DC conversion module

14‧‧‧Inverter Module

T1‧‧‧ transmission line

B1‧‧‧ battery module

E1‧‧‧Power

S1‧‧‧Solar power storage module

L1‧‧‧ load

Claims (10)

The utility model relates to a grid-connected power supply system, which is suitable for connecting a solar power outputted by a solar energy storage module, a battery power outputted by a battery module and a utility power to a load, and the grid-connected power supply system comprises: An electric meter module electrically connecting the mains and the load; a DC conversion module electrically connecting the battery module and the solar storage module; and an inverter module electrically connected to the solar storage module a DC conversion module, the meter module and the load; wherein the DC conversion module detects the presence of the solar power and detects a surplus power flowing through the meter module, the first power of the solar power The inverter module is inverted to supply power to the load, and the second power of the solar power is converted into a charging power through the DC conversion module to charge the battery module. The grid-connected power supply system of claim 1, wherein the DC conversion module includes a detection circuit electrically connected to the solar energy storage module, the detection circuit is configured to detect the presence of the solar power and collect parameters of the solar power . The grid-connected power supply system of claim 2, wherein the detecting circuit detects that the solar power cannot meet the operation of the inverter module, and when the battery module meets a discharge condition, the battery module outputs the battery power. The battery power is converted into DC power through the DC conversion module, and the DC power is inverted via the inverter module to supply power to the load. The grid-connected power supply system of claim 2, wherein the DC conversion module further comprises a control circuit and a buck-boost conversion circuit, the control circuit is electrically connected to the buck-boost conversion circuit and the detection circuit, and the buck-boost conversion The circuit is electrically connected between the battery module, the solar energy storage module and the inverter module, and the control circuit is configured to control the charging and discharging circuit and the charging operation or discharging operation of the battery module. The grid-connected power supply system of claim 4, wherein the meter module has a detecting circuit for detecting the excess power, and the control circuit is in wired communication or wireless communication with the meter module. The grid-connected power supply system of claim 5, further comprising a transmission line electrically connected between the meter module and the DC conversion module, wherein the meter module communicates with the DC conversion module through the transmission line, The transmission line is a full-duplex or half-duplex communication line. The grid-connected power supply system of claim 1, 5 or 6, wherein the meter module is a mechanical meter, an electronic meter or a smart meter. The grid-connected power supply system of claim 1, wherein the inverter module is a grid-connected inverter, and the grid-connected inverter inverts the solar power to supply the load, and the power supply is greater than the load. When the power is consumed, the excess power will be drained to the utility grid. The grid-connected power supply system of claim 1 further includes a DC load, electrically connected to the DC conversion module, and the DC conversion module is configured to supply power to the DC load. The grid-connected power supply system of claim 1, further comprising an inverter electrically connected to the DC conversion module, wherein the DC conversion module is configured to supply power to the inverter.