Power supply system
By dynamically adjusting the number of power generation components using control modules and isolation devices in the power supply system, the problem of insufficient flexibility of power supply systems in the prior art is solved, and the power generation guarantee during peak power consumption of the power grid and energy saving during low-level power consumption are achieved. , improving user experience and system flexibility.
Patent Information
- Application Number
- CN202310801311.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-30
- Publication Date
- 2024-12-31
AI Technical Summary
The existing power supply systems are less flexible, resulting in insufficient power generation during peak electricity consumption, which leads to poor user experience, or excessive power generation during low electricity consumption, which leads to waste of energy.
By introducing control modules and isolation devices into the power supply system, the number of power generation components is dynamically adjusted according to the electricity consumption demand in different time periods of the target power grid, ensuring that more power generation components are used during peak electricity consumption and reducing power generation during low electricity consumption periods components to increase flexibility of power supply systems.
It improves the flexibility of the power supply system over different time periods, reduces energy waste and improves user experience, ensuring the stability of power demand in the power grid.
Smart Images
Figure CN119231615A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of power generation, and specifically relates to a power supply system. Background Art
[0002] Taking photovoltaic power generation as an example, existing photovoltaic power generation components can continuously generate electricity to power electrical equipment in the power grid. However, since users' electricity consumption is concentrated in time, peak and trough electricity consumption may occur in a short period of time. Therefore, when the existing power generation components are used to supply power to the grid, the power supply method may be less flexible, resulting in insufficient power generation during peak power consumption periods, causing poor user experience, or excessive power generation during low power consumption periods, causing energy waste. Summary of the invention
[0003] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of poor flexibility of the existing power supply system, in a first aspect, the present application provides a power supply system, which includes: a power generation device, and an isolation device; the power generation device includes: a control module, and M power generation components; the first end of the control module is connected to the first end of the power generation component, the second end of the control module is connected to the first end of the isolation device, the second end of the power generation component is connected to the second end of the isolation device, and the third end of the isolation device is connected to the target power grid;
[0004] The control module is used to control the M power generation components to supply power to the target power grid through the isolation device during a first time period; and to control N of the M power generation components to stop supplying power to the target power grid through the isolation device during a second time period; wherein N is less than M, and the power demand of the target power grid during the second time period is less than the power demand during the first time period.
[0005] Optionally, the power supply system also includes: an energy storage device, the power generation component is connected to the energy storage device, and when the control module controls the N power generation components to stop supplying power to the target power grid through the isolation device, the N power generation components store the generated electric energy in the energy storage device.
[0006] Optionally, the control module is further used for:
[0007] Acquire the historical power demand of the target power grid in multiple time periods; the multiple time periods include: the first time period and the second time period;
[0008] The first time period, the second time period, and the value of N are determined according to the historical electricity demand in the multiple time periods.
[0009] Optionally, the isolation device includes: a first switch module, a voltage detection module, and a second switch module;
[0010] The second end of the control module is connected to the first end of the voltage detection module, the first end of the first switch module, and the first end of the second switch module; the output end of the power generation component is connected to the second end of the first switch module, and the second end of the second switch module is connected to the input end of the target power grid; the third end of the first switch module and the third end of the second switch module are both connected to the second end of the voltage detection module, and the fourth end of the first switch module and the fourth end of the second switch module are both connected to the third end of the voltage detection module;
[0011] The control module is configured to receive the voltage value on both sides of the target power grid detected by the voltage detection module within the first time period; when the voltage value is greater than or equal to the grid-connected voltage threshold, control the first switch module to conduct the first connection between the M power generation components and the first switch module, and control the second switch module to conduct the second connection between the target power grid and the second switch module;
[0012] In the second time period, the first switch module is controlled to disconnect the first connection between the N power generation components and the first switch module, so that the N power generation components stop supplying power to the target power grid.
[0013] In some embodiments, the control module is further configured to:
[0014] When the voltage value is less than the grid-connected voltage threshold, the first switch module is controlled to disconnect the first connection, and the second switch module is controlled to connect the second connection.
[0015] In some embodiments, the control module is further configured to:
[0016] When the M power generation components are not generating electricity, the first switch module is controlled to disconnect the first connection, and the second switch module is controlled to disconnect the second connection.
[0017] In some embodiments, the first switch module includes: a first switch and a second switch, wherein a first end of the first switch is connected to the positive electrode of the output end of the power generation component, and a second end of the first switch is connected to a first end of the voltage detection module; a first end of the second switch is connected to a negative electrode of the output end of the power generation component, and a second end of the second switch is connected to a second end of the voltage detection module; the first switch module disconnects the first connection, including: disconnecting both the first switch and the second switch;
[0018] and / or,
[0019] The second switch module includes: a third switch and a fourth switch, wherein a first end of the third switch is connected to a positive pole of an input end of the target power grid, and a second end of the third switch is connected to a first end of the voltage detection module; a first end of the fourth switch is connected to a negative pole of an input end of the target power grid, and a second end of the fourth switch is connected to a second end of the voltage detection module; disconnecting the second connection by the second switch module includes: both the third switch and the fourth switch are disconnected; and connecting the second connection by the second switch module includes: both the third switch and the fourth switch are closed.
[0020] In some embodiments, the voltage detection module includes: a voltage sampling unit, and an isolation unit;
[0021] The third end of the first switch module and the third end of the second switch module are both connected to the first end of the voltage sampling unit, and the fourth end of the first switch module and the fourth end of the second switch module are both connected to the second end of the voltage sampling unit; the third end of the voltage sampling unit is connected to the first end of the isolation unit; the second end of the isolation unit is connected to the control module;
[0022] The voltage sampling unit is used to sample the voltages at both sides of the target power grid to obtain the initial voltages at both sides of the target power grid;
[0023] The isolation unit is used to isolate the target power grid from the control module when the initial voltage is zero, and determine voltage values at both sides of the target power grid according to the initial voltage.
[0024] In some embodiments, the voltage sampling unit includes: a first resistor, a second resistor, and a first amplifying subunit;
[0025] The third end of the first switch module and the third end of the second switch module are both connected to the first end of the first resistor; the second end of the first resistor and the first end of the second resistor are both connected to the first end of the first amplifying subunit; the second end of the first amplifying subunit is connected to the first end of the isolation unit; the fourth end of the first switch module and the fourth end of the second switch module are both connected to the second end of the second resistor;
[0026] The first amplifying subunit is used to amplify the voltage obtained by sampling the voltages at both sides of the target power grid to obtain the initial voltage.
[0027] In some embodiments, the isolation unit includes: a first photocoupler diode, a second photocoupler diode, and a third photocoupler diode;
[0028] The second end of the first amplifying subunit is connected to the cathode of the first optocoupler diode, and the anode of the first optocoupler diode is connected to the first output end of the target power grid; the first end of the first amplifying subunit is connected to the cathode of the second optocoupler diode; the anode of the second optocoupler diode and the anode of the third optocoupler diode are both grounded; the cathode of the third optocoupler diode is connected to the control module.
[0029] In some embodiments, the power generation component is a photovoltaic power generation component; the photovoltaic power generation component outputs direct current, and the target power grid is a direct current power grid.
[0030] It can be understood by those skilled in the art that the power supply system provided by the present application uses M power generation components to supply power to the target power grid during the first time period when the power demand of the target power grid is relatively large, that is, during the peak power consumption period of the target power grid, thereby reducing the possibility of insufficient power generation during the peak power consumption period of the target power grid and improving the user experience. During the second time period when the power demand of the target power grid is relatively small, N power generation components can be stopped from supplying power to the target power grid, thereby realizing that during the low power consumption period of the target power grid, the target power grid is supplied with power by MN power generation components, thereby reducing energy waste. Through the above method, the power supply system can use different numbers of power generation components to supply power to the target power grid during different time periods, thereby improving the flexibility of the power supply system, thereby reducing energy waste and improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The following describes the preferred implementation of the power supply system of the present application with reference to the accompanying drawings and in combination with the power supply system. The accompanying drawings are:
[0032] Figure 1 A schematic diagram of the structure of a power supply system provided for this application;
[0033] Figure 2 A schematic diagram of the structure of another power supply system provided for this application;
[0034] Figure 3 A schematic diagram of the structure of another power supply system provided in this application;
[0035] Figure 4 A schematic diagram of the structure of another power supply system provided in this application;
[0036] Figure 5 A schematic diagram of the structure of a voltage detection module provided in this application;
[0037] Figure 6 A schematic diagram of the structure of a voltage sampling unit provided in this application;
[0038] Figure 7 A schematic diagram of the structure of an isolation unit provided in this application;
[0039] Figure 8 A schematic diagram of the structure of an isolation device provided in this application. DETAILED DESCRIPTION
[0040] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.
[0041] Secondly, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.
[0042] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0043] Green renewable energy generation methods such as solar photovoltaic power generation (abbreviated as photovoltaic power generation) and wind power generation are gaining more and more attention. These power generation methods can supply power to electrical equipment in the power grid. With the continuous improvement of living standards, the proportion of user electricity consumption in the total load of the power grid is also increasing.
[0044] Taking photovoltaic power generation as an example, existing photovoltaic power generation components can continuously generate electricity to power electrical equipment in the power grid. However, since users' electricity consumption is concentrated in time, the load on the power grid may fluctuate drastically in a short period of time, resulting in peak and valley power consumption. Therefore, when the existing photovoltaic power generation components are used to power the power grid, the power supply method may have poor flexibility, resulting in insufficient power generation during peak power consumption periods, causing poor user experience, or excessive power generation during valley power consumption, causing energy waste.
[0045] Considering that the reason why the above-mentioned problems exist in the existing power supply method is that the power supply system has poor flexibility, the present application proposes a method of using different numbers of power generation components to power the target power grid in different time periods, so as to improve the flexibility of the power supply system, thereby reducing energy waste and improving user experience.
[0046] The technical solution of the present application is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
[0047] Figure 1 This is a schematic diagram of the structure of a power supply system provided in this application. Figure 1 As shown, the power supply system may include: a power generation device, and an isolation device. The power generation device may include: a control module, and M power generation components. The above M may be an integer greater than 1. It should be understood that Figure 1 The power supply system is merely described by taking two power generation components as an example, and the present application does not limit the number of power generation components included in the above power supply system.
[0048] The first end of the control module may be connected to the first end of the power generation component. The second end of the control module may be connected to the first end of the isolation device. The second end of the power generation component may be connected to the second end of the isolation device. The third end of the isolation device may be connected to the target power grid.
[0049] It should be understood that the present application does not limit the type of the above-mentioned power generation component. Exemplarily, the power generation component can be, for example, a photovoltaic power generation component, or any existing power generation component such as a wind power generation component. In some embodiments, the power generation component can provide an operating voltage for the above-mentioned control module. It should be understood that the present application does not limit the number of electrical devices included in the target power grid, as well as the types of electrical devices (such as air conditioners, water heaters, etc.).
[0050] Optionally, taking the above-mentioned power generation component as a photovoltaic power generation component as an example, the output of the photovoltaic power generation component can be direct current. The corresponding above-mentioned target power grid can be a direct current power grid. When the target power grid is a direct current power grid, the power-consuming equipment in the direct current power grid can be direct current power-consuming equipment. Exemplarily, the direct current power-consuming equipment can be any power-consuming equipment such as a water heater, an air conditioner, etc., and this application does not limit this. In this implementation, the power generation component can be directly connected in parallel to both sides of the direct current power grid without the need for inversion or rectification, thereby reducing power loss.
[0051] Alternatively, in some embodiments, the target power grid may also be an AC power grid. In this implementation, taking the output of DC power by the power generation component as an example, the power supply system may also include an inverter circuit "for inverting DC power into AC power" so that the AC power-consuming devices in the target power grid can use the AC power obtained by the inversion.
[0052] The above control module can be used to control M power generation components to supply power to the target power grid through the isolation device during the first time period; and to control N power generation components among the M power generation components to stop supplying power to the target power grid through the isolation device during the second time period.
[0053] Among them, the above-mentioned N can be an integer less than M and greater than or equal to 0. The electricity demand of the target power grid in the second time period is less than the electricity demand in the first time period. In other words, the target power grid is at peak power consumption in the first time period (compared to the second time period). The target power grid is at a low power consumption in the second time period (compared to the first time period). Through the above method, the power supply system can use M power generation components to supply power to the target power grid during the peak power consumption period of the target power grid, reducing the possibility of insufficient power generation during the peak power consumption period of the target power grid and improving the user experience. During the low power consumption period of the target power grid, the power supply system can reduce N power generation components and supply power to the target power grid through MN power generation components, reducing energy waste.
[0054] Optionally, the first time period, the second time period, and the value of N may be pre-stored in the control module. Alternatively, in some embodiments, the control module may determine the first time period, the second time period, and the value of N according to the historical power demand of the target power grid in multiple time periods. Alternatively, the first time period and the second time period may be pre-stored in the control module, and the value of N may be determined by the control module according to the historical power demand of the target power grid in multiple time periods.
[0055] It should be understood that, taking a year (or a month, a week, a day, etc.) as an example, the year may include at least one first time period and at least one second time period. Optionally, the durations of different first time periods may be the same or different. The durations of different second time periods may be the same or different. In addition, optionally, the values of N corresponding to different second time periods may be the same or different. Exemplarily, the value of the above-mentioned N may, for example, be negatively correlated with the electricity demand in the second time period. In other words, the value of N corresponding to the second time period with more electricity demand may be smaller, so that the power supply system can supply power to the target power grid through more power generation components. The value of N corresponding to the second time period with less electricity demand may be larger, so that the power supply system can supply power to the target power grid through fewer power generation components. Through the above method, the flexibility of the power supply system is further improved.
[0056] In this embodiment, during the first time period when the power demand of the target power grid is relatively large, that is, during the peak power consumption period of the target power grid, M power generation components are used to supply power to the target power grid, thereby reducing the possibility of insufficient power generation during the peak power consumption period of the target power grid and improving the user experience. During the second time period when the power demand of the target power grid is relatively small, N power generation components can be stopped from supplying power to the target power grid, thereby realizing that during the low power consumption period of the target power grid, MN power generation components are used to supply power to the target power grid, thereby reducing energy waste. Through the above method, the power supply system can use different numbers of power generation components to supply power to the target power grid in different time periods, thereby improving the flexibility of the power supply system, thereby reducing energy waste and improving user experience.
[0057] Figure 2 This is a schematic diagram of another power supply system provided in this application. Figure 2 As shown, as a possible implementation, the power supply system may further include: an energy storage device. For any power generation component, the power generation component may be connected to the energy storage device.
[0058] In this implementation, when the control module controls the N power generation components to stop supplying power to the target power grid through the isolation device, the N power generation components can store the generated electric energy in the energy storage device. By storing the electric energy generated by the N power generation components in the energy storage device, when the N power generation components do not supply power to the target power grid, the generated electric energy can be stored for subsequent use, further improving the flexibility of the power supply system and reducing energy waste.
[0059] Optionally, the energy storage device can be any existing energy storage device capable of storing electrical energy, which is not described in detail in this application. In addition, it should be understood that this application does not limit how the power generation component stores electrical energy in the energy storage device, and any existing electrical energy storage method can be referred to, which is not described in detail in this application.
[0060] As another possible implementation, when the control module controls the N power generation components to stop supplying power to the target power grid through the isolation device, the N power generation components may also stop generating electricity to reduce the waste of “resources used for power generation”.
[0061] The following is a detailed description of how the control module determines the first time period, the second time period, and the value of N:
[0062] As a possible implementation, the control module can also be used to obtain the historical power demand of the target power grid in multiple time periods. The multiple time periods may include: the first time period and the second time period. Then, the control module can determine the values of the first time period, the second time period, and N according to the historical power demand in the multiple time periods.
[0063] Optionally, the power supply system may further include, for example, a power demand detection device. The control module may be connected to the target power grid through the power demand detection device. The control module may, for example, obtain and store the power demand of the target power grid in each time period collected by the power demand detection device, so as to obtain the historical power demand in the above-mentioned multiple time periods. Optionally, the way in which the power demand detection device detects the power demand of the target power grid in a time period may refer to any existing power demand acquisition method, and this application will not go into details herein.
[0064] It should be understood that the present application does not limit the historical duration corresponding to the historical electricity demand in the above-mentioned multiple time periods. Exemplarily, taking the above-mentioned "historical electricity demand in multiple time periods" as an example: "When each hour in a day is regarded as a time period (that is, a total of 24 time periods), the historical electricity demand in each of the above time periods in the past 10 days" as an example, each of the above-mentioned 24 time periods can correspond to 10 historical electricity demands. Exemplarily, the control module can, for example, use the average value of the 10 historical electricity demands as the electricity demand for the time period. Then, for each time period, the control module can, for example, determine the value of N corresponding to the time period based on the electricity demand in the time period, and the mapping relationship between the preset electricity demand and the N value. Exemplarily, the value of N above can, for example, be negatively correlated with the electricity demand in the time period. When N is not equal to 0, the time period is the second time period. When N is equal to 0, the time period is the first time period.
[0065] In this embodiment, the first time period, the second time period, and the value of N are determined by the historical electricity demand of the target power grid in multiple time periods, so that the values of the first time period, the second time period, and N can change with time and change according to the changes in the historical electricity demand, thereby improving the accuracy of determining the first time period, the second time period, and the value of N, further reducing the energy waste of power supply through the power supply system, and further improving the user experience.
[0066] The structure of the above-mentioned isolation device is described in detail below:
[0067] Figure 3 This is a schematic diagram of the structure of another power supply system provided in this application. Figure 3 As shown, as a possible implementation, the isolation device may include: a first switch module, a voltage detection module, and a second switch module (it should be understood that Figure 3 The connection relationship between the control module and the power generation component is not shown).
[0068] Wherein, the second end of the control module can be connected to the first end of the voltage detection module, the first end of the first switch module, and the first end of the second switch module. The output end of the power generation component can be connected to the second end of the first switch module. The second end of the second switch module can be connected to the input end of the target power grid. The third end of the first switch module and the third end of the second switch module can both be connected to the second end of the voltage detection module. The fourth end of the first switch module and the fourth end of the second switch module can both be connected to the third end of the voltage detection module.
[0069] Exemplarily, for any power generation component, the connection between the second end of the first switch module and the output end of the power generation component may include, for example: the positive connection end of the first switch module is connected to the positive pole of the output end of the power generation component. The negative connection end of the second end of the first switch module is connected to the negative pole of the output end of the power generation component.
[0070] Exemplarily, the connection between the second end of the second switch module and the input end of the target power grid may include, for example: the positive connection end of the second end of the second switch module is connected to the positive pole of the input end of the target power grid. The negative connection end of the second end of the second switch module is connected to the negative pole of the input end of the target power grid.
[0071] The voltage detection module can be used to detect the voltage values on both sides of the target power grid. The control module can be used to receive the voltage values on both sides of the target power grid detected by the voltage detection module within a first time period. Then, when the voltage value is greater than or equal to the grid-connected voltage threshold, the control module can control the first switch module to conduct the first connection between the M power generation components and the first switch module, and control the second switch module to conduct the second connection between the target power grid and the second switch module. The control module can control the first switch module to disconnect the first connection between N of the M power generation components and the first switch module within a second time period, so that the N power generation components stop supplying power to the target power grid.
[0072] If the voltage value is greater than or equal to the grid-connected voltage threshold, it means that the target grid voltage has reached the grid-connected condition. Then, by the first connection and the second connection corresponding to the M power generation components, the target grid is powered by the M power generation components. Through the above method, the power supply system can determine that the target grid has reached the grid-connected condition and start to supply power to the target grid. While supplying power to the target grid, the safety of power supply is guaranteed. Exemplarily, the grid-connected voltage threshold can be, for example, pre-stored in the control module.
[0073] In this embodiment, during the first time period when the power demand of the target power grid is relatively large, when the voltage value on both sides of the target power grid is greater than or equal to the grid-connected voltage threshold, the first connection between the M power generation components and the first switch module can be turned on, and the second connection between the target power grid and the second switch module can be turned on, so that the power supply system can use the M power generation components to supply power to the target power grid during the peak power consumption period of the target power grid after determining that the target power grid has reached the grid-connected conditions, thereby reducing the possibility of insufficient power generation during the peak power consumption period of the target power grid and ensuring the safety of power supply to the target power grid. During the second time period when the power demand of the target power grid is relatively small, the first switch module can be controlled to disconnect the first connection with the N power generation components, so that the N power generation components stop supplying power to the target power grid, thereby realizing that during the low power consumption period of the target power grid, the target power grid is supplied by MN power generation components, thereby reducing energy waste.
[0074] As a possible implementation manner, the control module may also be configured to control the first switch module to disconnect the first connection and control the second switch module to conduct the second connection when the voltage value is less than a grid-connected voltage threshold.
[0075] Optionally, if the above voltage value is less than the grid-connected voltage threshold, it means that the target grid has no electricity or the voltage does not meet the grid-connected conditions (for example, the target grid loses power or is powered off for maintenance, etc.). Therefore, by controlling the first switch module to disconnect the above first connection when the voltage value on both sides of the target grid is less than the grid-connected voltage threshold, the power generation component is isolated from the target grid, thereby avoiding the problem that the power generation component is still connected to the target grid when the target grid loses power, thereby avoiding the risk of electric shock to the user and improving the safety of the power supply system. By controlling the second switch module to conduct the above second connection, the control module can continue to determine whether the voltage value on both sides of the target grid is less than the grid-connected voltage threshold, continue to monitor the voltage on both sides of the target grid, and promptly supply power to the target grid when the target grid meets the grid-connected conditions, thereby improving the user experience.
[0076] As a possible implementation manner, the control module may also be used to control the first switch module to disconnect the first connection, and control the second switch module to disconnect the second connection when none of the M power generation components generate electricity.
[0077] Exemplarily, taking the above-mentioned power generation component providing the control module with a working voltage as an example, when each power generation component is not generating electricity, the above-mentioned control module is powered off. After the control module is powered off, the first switch module and the second switch module can, for example, be restored to an initial state. Among them, the initial state can be that the above-mentioned first connection is disconnected, and the above-mentioned second connection is disconnected. Through the above-mentioned method, it is achieved that regardless of whether the target power grid has electricity, as long as the power generation component is not generating electricity, the target power grid will be physically disconnected from the power generation component and the control module. Through the above-mentioned method, it is avoided that when each power generation component is not generating electricity, there is still current in the circuit between the target power grid and the power generation component, thereby improving the safety of the power supply system.
[0078] The structure of the first switch module and the structure of the second switch module are described in detail below:
[0079] Figure 4 This is a schematic diagram of the structure of another power supply system provided in this application. Figure 4 As shown (it should be understood Figure 4 Only one power generation assembly is shown, and Figure 4 As a possible implementation, the first switch module may include: a first switch, and a second switch. For any power generation component, the first end of the first switch may be connected to the positive output terminal of the power generation component. The second end of the first switch may be connected to the first end of the voltage detection module. The first end of the second switch may be connected to the negative output terminal of the power generation component. The second end of the second switch may be connected to the second end of the voltage detection module.
[0080] In this implementation, the first switch module disconnecting the first connection may include: both the first switch and the second switch are disconnected. The first switch and the second switch in the first switch module lay the foundation for disconnecting the first connection and conducting the first connection, thereby laying the foundation for improving the flexibility of the power supply system.
[0081] As a possible implementation, Figure 4 As shown, the second switch module may include: a third switch, and a fourth switch. The first end of the third switch may be connected to the positive pole of the input end of the target power grid. The second end of the third switch may be connected to the first end of the voltage detection module. The first end of the fourth switch may be connected to the negative pole of the input end of the target power grid. The second end of the fourth switch may be connected to the second end of the voltage detection module.
[0082] In this implementation, the second switch module disconnecting the second connection may include: both the third switch and the fourth switch are disconnected. The second switch module conducting the second connection may include: both the third switch and the fourth switch are closed. The third switch and the fourth switch in the second switch module lay the foundation for disconnecting the second connection and conducting the second connection, thus laying the foundation for improving the flexibility of the power supply system.
[0083] The structure of the voltage detection module is described in detail below:
[0084] Figure 5 This is a schematic diagram of the structure of a voltage detection module provided in this application. Figure 5 As shown, as a possible implementation, the voltage detection module may include: a voltage sampling unit, and an isolation unit.
[0085] Wherein, the third end of the first switch module and the third end of the second switch module may be connected to the first end of the voltage sampling unit. The fourth end of the first switch module and the fourth end of the second switch module may be connected to the second end of the voltage sampling unit. The third end of the voltage sampling unit may be connected to the first end of the isolation unit. The second end of the isolation unit may be connected to the control module.
[0086] The voltage sampling unit can be used to sample the voltages on both sides of the target power grid to obtain the initial voltages on both sides of the target power grid.
[0087] Figure 6 This is a schematic diagram of the structure of a voltage sampling unit provided in this application. Figure 6 As shown, in some embodiments, the voltage sampling unit may include: a first resistor, a second resistor, and a first amplifying subunit.
[0088] Wherein, the third end of the first switch module and the third end of the second switch module may be connected to the first end of the first resistor. The second end of the first resistor and the first end of the second resistor may be connected to the first end of the first amplifying subunit. The second end of the first amplifying subunit may be connected to the first end of the isolation unit. The fourth end of the first switch module and the fourth end of the second switch module may be connected to the second end of the second resistor.
[0089] The first resistor and the second resistor may be used as sampling resistors for sampling voltages from both sides of the target power grid. The first amplifying subunit may be used to amplify the voltages obtained by sampling voltages from both sides of the target power grid to obtain the initial voltage.
[0090] Exemplarily, the first amplifying subunit may be any existing operational amplifier, which is not limited in the present application. The resistance value of the first resistor, the resistance value of the second resistor, the voltage amplification factor of the first amplifying subunit, etc. are not limited in the present application.
[0091] Through the first resistor and the second resistor, the power supply system can sample voltage from both sides of the target power grid. The sampled voltage can be amplified by the first amplifying subunit, and the initial voltage can be input to the isolation unit after being obtained, so that the isolation unit can determine whether to isolate the target power grid from the control module based on the magnitude of the initial voltage, further improving the flexibility of the power supply system.
[0092] The isolation unit can be used to isolate the target power grid from the control module when the initial voltage is zero, and determine the voltage values at both sides of the target power grid according to the initial voltage.
[0093] Figure 7 This is a schematic diagram of the structure of an isolation unit provided in this application. Figure 7 As shown, in some embodiments, the isolation unit may include: a first photocoupler diode, a second photocoupler diode, and a third photocoupler diode.
[0094] The second end of the first amplifying subunit may be connected to the cathode of the first optocoupler diode. The anode of the first optocoupler diode may be connected to the first output end of the target power grid. The first end of the first amplifying subunit may be connected to the cathode of the second optocoupler diode. The anode of the second optocoupler diode and the anode of the third optocoupler diode may both be grounded. The cathode of the third optocoupler diode may be connected to the control module.
[0095] The anode of the first optocoupler diode is connected to the first output terminal of the target power grid, so that the target power grid can provide a positive working voltage for the first optocoupler diode. In some embodiments, the anode of the first optocoupler diode can also be connected to the first output terminal of the target power grid through a voltage conversion module. The voltage conversion module can convert the voltage of the first output terminal of the target power grid into the working voltage required by the anode of the first optocoupler diode.
[0096] Through the above-mentioned isolation unit, the first optocoupler diode and the second optocoupler diode generate brightness of different intensities according to the voltage change on both sides of the target power grid. The third optocoupler diode can generate currents of different magnitudes according to the brightness, so that the magnitude of the voltage value input to the control module changes with the magnitude of the current. When the initial voltage is zero, the first optocoupler diode and the second optocoupler diode are both off, so that the voltage across the third optocoupler diode is zero, and therefore the magnitude of the voltage value input to the control module is zero, thereby isolating the target power grid from the control module (that is, isolating the target power grid from the control module when the target power grid loses power), while supplying power to the target power grid through the above-mentioned power supply system, further improving the safety of the power supply system.
[0097] It should be understood that the isolation unit can also achieve "isolating the target power grid from the control module when the initial voltage is zero, and determining the voltage values on both sides of the target power grid based on the initial voltage" through other existing circuits, for example, and the present application does not limit this.
[0098] In some embodiments, the voltage detection module may further include: a second amplifying unit, through which the cathode of the third photocoupler diode is connected to the control module. The second amplifying unit may be used to amplify the voltage across the third photocoupler diode to obtain the amplified voltage as the voltage value across the target power grid.
[0099] Through the above-mentioned second amplification unit, the voltage across the third optocoupler diode can be amplified and output to the control module as the voltage value on both sides of the target power grid, so that the control module can judge whether the voltage value is less than the grid-connected voltage threshold based on the amplified voltage, thereby improving the accuracy of the control module in making the judgment, and further improving the flexibility of the control module in supplying power to the target power grid based on the judgment result, further improving the user experience.
[0100] Alternatively, in some embodiments, the cathode of the third optocoupler diode of the isolation unit may also be directly connected to the control module, for example.
[0101] In some embodiments, the third terminal of the first amplifying subunit may be connected to the first output terminal of the target power grid. The target power grid may be used to provide the first amplifying subunit with an operating voltage of the first amplifying subunit. The second amplifying unit may also be connected to a control module. The control module may be used to provide the second amplifying unit with an operating voltage of the second amplifying unit.
[0102] Optionally, the third terminal of the first amplifying subunit may be directly connected to the first output terminal of the target power grid, for example. Alternatively, the third terminal of the first amplifying subunit may also be connected to the first output terminal of the target power grid via a voltage conversion module, etc. The voltage conversion module may convert the voltage value of the first output terminal of the target power grid into the operating voltage of the first amplifying subunit, so that the first amplifying subunit can operate.
[0103] Optionally, the second amplifying unit may be directly connected to the control module. Alternatively, the second amplifying unit may also be connected to the control module via a voltage conversion module, etc. The voltage conversion module may convert the voltage value of the control module into the operating voltage of the second amplifying unit, so that the second amplifying unit can operate.
[0104] In this embodiment, the voltage sampling unit in the voltage detection module can sample the voltage on both sides of the target power grid to obtain the initial voltage on both sides of the target power grid. The isolation unit can isolate the target power grid from the control module when the initial voltage is zero, further improving the safety of the power supply system. The voltage value on both sides of the target power grid is determined by the initial voltage, and the voltage value can be output to the control module to realize the monitoring of the target power grid in the isolated state.
[0105] For example, Figure 8 This is a schematic diagram of the structure of an isolation device provided in this application. Figure 8 As shown, taking the above target power grid as a DC power grid as an example, for any power generation component among the above M power generation components, DC+ represents the positive output terminal of the power generation component; DC- represents the negative output terminal of the power generation component. DC_O+ represents the positive pole of the DC power grid; DC_O- represents the negative pole of the DC power grid. V DC O is one end of the control module.
[0106] K1 represents the first switch; K2 represents the second switch; K3 represents the third switch; K4 represents the fourth switch. R4 represents the first resistor; R5 represents the second resistor. U2 represents the first amplifying subunit. U1 represents an isolation unit, which may be a linear optocoupler, and U3 may be used to represent a second amplifying unit.
[0107] like Figure 8 As shown, C1 is an anti-oscillation capacitor, R2 is a current limiting resistor (which can be used to protect the optocoupler diode in U1), and R3 is also a resistor that can be used to adjust the amplification factor of U3.
[0108] In addition, the Vcc' terminal of U2 is connected to the first output terminal of the target power grid. The target power grid can be used to provide the first amplifier subunit with the working voltage of the first amplifier subunit (or the DC power grid can be used as the primary working power supply of U3). The 5V interface of U1 is the positive electrode of the first optocoupler diode, which can be connected to the first output terminal of the target power grid. The Vcc terminal of U3 can be connected to the control module. The control module can be used to provide the working voltage for U3.
[0109] It should be understood that Figure 8 The control module and the connection relationship between each device and the control module are not shown. The connection relationship between different devices and the control module can refer to the structure described in any of the above embodiments, and will not be repeated here.
[0110] Based on Figure 8 The power supply circuit shown takes the photovoltaic cell assembly as an example. When the M photovoltaic cell assemblies are not generating electricity, the control system (that is, the aforementioned control module) has no power, and the initial states of K1 to K4 are all disconnected. Regardless of whether the external DC power grid has power or not, the photovoltaic cell assembly and the control system will be physically disconnected.
[0111] When the photovoltaic cell assembly starts to generate electricity, the control system starts to work, keeping K1 and K2 open and closing K3 and K4. The optocoupler primary of the linear optocoupler can work (the diode is on) or not work (the diode is not on) depending on whether there is power in the external DC grid.
[0112] If the external DC grid (that is, the DC grid) has no power or the voltage does not meet the grid-connected conditions (that is, the aforementioned voltage value is less than the grid-connected voltage threshold), K1 and K2 are disconnected, K3 and K4 are closed, and the control system continues to monitor the state of the external DC grid until the voltage values on both sides of the DC grid meet the grid-connected conditions.
[0113] If the voltage of the external DC grid meets the grid connection conditions, during the first time period when the power demand of the target grid is relatively large, when the voltage value on both sides of the target grid is greater than or equal to the grid connection voltage threshold, K1, K2, K3, and K4 can be controlled to be closed, and the DC power generated by the photovoltaic cell assembly is controlled by the control system and connected to the external DC grid. During the low power consumption period of the target grid, the power supply system can reduce N power generation assemblies and supply power to the target grid through MN power generation assemblies, reducing energy waste.
[0114] In this embodiment, through the above-mentioned four-switch isolation circuit topology, the power supply system can use different numbers of power generation components to power the target power grid in different time periods, thereby improving the flexibility and safety of the power supply system, thereby reducing energy waste and improving user experience.
[0115] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.
Claims
1. A power supply system, characterized in that: The power supply system comprises: a power generation device and an isolation device; the power generation device comprises: a control module and M power generation components; a first end of the control module is connected to a first end of the power generation component, a second end of the control module is connected to a first end of the isolation device, a second end of the power generation component is connected to a second end of the isolation device, and a third end of the isolation device is connected to a target power grid; The control module is used to control the M power generation components to supply power to the target power grid through the isolation device during a first time period; and to control N of the M power generation components to stop supplying power to the target power grid through the isolation device during a second time period; wherein N is less than M, and the power demand of the target power grid during the second time period is less than the power demand during the first time period.
2. The power supply system according to claim 1, characterized in that: The power supply system also includes: an energy storage device, the power generation component is connected to the energy storage device, and when the control module controls the N power generation components to stop supplying power to the target power grid through the isolation device, the N power generation components store the generated electric energy in the energy storage device.
3. The power supply system according to claim 1 or 2, characterized in that: The control module is also used for: Acquire the historical power demand of the target power grid in multiple time periods; the multiple time periods include: the first time period and the second time period; The first time period, the second time period, and the value of N are determined according to the historical electricity demand in the multiple time periods.
4. The power supply system according to claim 1 or 2, characterized in that: The isolation device comprises: a first switch module, a voltage detection module, and a second switch module; The second end of the control module is connected to the first end of the voltage detection module, the first end of the first switch module, and the first end of the second switch module; the output end of the power generation component is connected to the second end of the first switch module, and the second end of the second switch module is connected to the input end of the target power grid; the third end of the first switch module and the third end of the second switch module are both connected to the second end of the voltage detection module, and the fourth end of the first switch module and the fourth end of the second switch module are both connected to the third end of the voltage detection module; The control module is configured to receive the voltage value on both sides of the target power grid detected by the voltage detection module within the first time period; when the voltage value is greater than or equal to the grid-connected voltage threshold, control the first switch module to conduct the first connection between the M power generation components and the first switch module, and control the second switch module to conduct the second connection between the target power grid and the second switch module; In the second time period, the first switch module is controlled to disconnect the first connection between the N power generation components and the first switch module, so that the N power generation components stop supplying power to the target power grid.
5. The power supply system according to claim 4, characterized in that: The control module is also used for: When the voltage value is less than the grid-connected voltage threshold, the first switch module is controlled to disconnect the first connection, and the second switch module is controlled to connect the second connection.
6. The power supply system according to claim 4, characterized in that: The control module is also used for: When the M power generation components are not generating electricity, the first switch module is controlled to disconnect the first connection, and the second switch module is controlled to disconnect the second connection.
7. The power supply system according to claim 4, characterized in that: The first switch module includes: a first switch and a second switch, wherein a first end of the first switch is connected to the positive electrode of the output end of the power generation component, and a second end of the first switch is connected to the first end of the voltage detection module; a first end of the second switch is connected to the negative electrode of the output end of the power generation component, and a second end of the second switch is connected to the second end of the voltage detection module; the first switch module disconnects the first connection, including: both the first switch and the second switch are disconnected; and / or, The second switch module includes: a third switch and a fourth switch, wherein a first end of the third switch is connected to a positive pole of an input end of the target power grid, and a second end of the third switch is connected to a first end of the voltage detection module; a first end of the fourth switch is connected to a negative pole of an input end of the target power grid, and a second end of the fourth switch is connected to a second end of the voltage detection module; disconnecting the second connection by the second switch module includes: both the third switch and the fourth switch are disconnected; and connecting the second connection by the second switch module includes: both the third switch and the fourth switch are closed.
8. The power supply system according to claim 4, characterized in that: The voltage detection module includes: a voltage sampling unit, and an isolation unit; The third end of the first switch module and the third end of the second switch module are both connected to the first end of the voltage sampling unit, and the fourth end of the first switch module and the fourth end of the second switch module are both connected to the second end of the voltage sampling unit; the third end of the voltage sampling unit is connected to the first end of the isolation unit; the second end of the isolation unit is connected to the control module; The voltage sampling unit is used to sample the voltages at both sides of the target power grid to obtain the initial voltages at both sides of the target power grid; The isolation unit is used to isolate the target power grid from the control module when the initial voltage is zero, and determine voltage values at both sides of the target power grid according to the initial voltage.
9. The power supply system according to claim 8, characterized in that: The voltage sampling unit includes: a first resistor, a second resistor, and a first amplifying subunit; The third end of the first switch module and the third end of the second switch module are both connected to the first end of the first resistor; the second end of the first resistor and the first end of the second resistor are both connected to the first end of the first amplifying subunit; the second end of the first amplifying subunit is connected to the first end of the isolation unit; the fourth end of the first switch module and the fourth end of the second switch module are both connected to the second end of the second resistor; The first amplifying subunit is used to amplify the voltage obtained by sampling the voltages at both sides of the target power grid to obtain the initial voltage.
10. The power supply system according to claim 9, characterized in that: The isolation unit includes: a first photocoupler diode, a second photocoupler diode, and a third photocoupler diode; The second end of the first amplifying subunit is connected to the cathode of the first optocoupler diode, and the anode of the first optocoupler diode is connected to the first output end of the target power grid; the first end of the first amplifying subunit is connected to the cathode of the second optocoupler diode; the anode of the second optocoupler diode and the anode of the third optocoupler diode are both grounded; the cathode of the third optocoupler diode is connected to the control module.
11. The power supply system according to claim 1 or 2, characterized in that: The power generation component is a photovoltaic power generation component; the photovoltaic power generation component outputs direct current, and the target power grid is a direct current power grid.