WO2024041010A1

WO2024041010A1 - Energy router, control method, control apparatus and power system

Info

Publication number: WO2024041010A1
Application number: PCT/CN2023/090542
Authority: WO
Inventors: 孙雨欣; 黄猛; 黄颂儒; 崔宇; 刘永杰; 郭浩
Original assignee: 珠海格力电器股份有限公司; 国创能源互联网创新中心(广东)有限公司
Priority date: 2022-08-24
Filing date: 2023-04-25
Publication date: 2024-02-29
Also published as: CN115313373A

Abstract

Disclosed in the present application are an energy router, a control method, a control apparatus and a power system. The energy router comprises: a first terminal, which is used for connecting to a positive electrode of an energy storage battery; a second terminal, a third terminal and a fourth terminal, which are used for respectively connecting to three-phase input ends of an alternating-current power grid, or respectively connecting to positive electrodes of three photovoltaic power generation modules; a fifth terminal, which is used for connecting to one of a negative electrode of the energy storage battery, a neutral wire of the alternating-current power grid and a negative electrode of a photovoltaic power generation module; and a switching module, a first end of which is connected to a rectification module, and a second end of which is respectively connected to the first terminal, the second terminal, the third terminal and the fourth terminal and is used for controlling, according to a control instruction, whether to switch on the first terminal, the second terminal, the third terminal and the fourth terminal. The present application can realize the integration of a photovoltaic DC/DC conversion function, an energy storage DC/DC conversion function and a power grid conversion function by means of the same hardware, thereby reducing the hardware cost.

Description

Energy router, control method and control device, power system

Cross-references to related applications

This disclosure is based on the application with CN application number 202211021451.4 and the filing date is August 24, 2022, and claims its priority. The disclosure content of the CN application is hereby incorporated into this disclosure as a whole.

Technical field

The present disclosure relates to the field of electronic power technology, and specifically to an energy router, a control method and a control device, and a power system.

Background technique

At present, in the new power system with new energy as the main body, photovoltaic power generation, energy storage and backup, and grid coordinated power supply are very important components. Figure 1 shows the existing photovoltaic DC (Direct Current, DC)/DC converter Figure 2 is a structural diagram of an existing energy storage DC/DC converter. Figure 3 is a structural diagram of an existing converter. It can be seen that in the prior art, photovoltaic DC/DC converters, The three systems of energy storage DC/DC converter and grid converter adopt different hardware structures.

Contents of the invention

According to a first aspect of an embodiment of the present disclosure, an energy router is provided, wherein the energy router includes: a first terminal for connecting the positive electrode of the energy storage battery; a second terminal, a third terminal and a fourth terminal for connecting Connect to the three-phase input terminals of the AC power grid, or connect to the positive poles of three photovoltaic power generation modules respectively; the fifth terminal is used to connect the negative pole of the energy storage battery, the neutral line of the AC power grid, or the negative pole of the photovoltaic power generation module. The switching module has a first end connected to the rectifier module and a second end connected to the first terminal, the second terminal, the third terminal and the fourth terminal respectively, for controlling the third terminal according to the control instruction. Whether the first terminal, the second terminal, the third terminal, and the fourth terminal are conductive.

Further, the switching module includes: a first switch, the first end of which is connected between the upper and lower arms of the first rectifier bridge of the rectifier module, the second end is connected to the first terminal, and the third end is connected to all The second terminal; a second switch, a first end of which is connected between the upper and lower arms of the second rectifier bridge of the rectifier module, a second end of which is connected to the first terminal, and a third end of which is connected to the third terminal. ; The third switch has a first end connected between the upper and lower arms of the third rectifier bridge of the rectifier module, a second end connected to the first terminal, and a third end connected to the fourth terminal.

Further, the first switch, the second switch and the third switch are single pole double throw switches.

Further, when the function of the energy router is energy storage DC/DC conversion, the first terminal is turned on, and the second terminal, the third terminal and the fourth terminal are turned off; When the function of the energy router is photovoltaic DC/DC conversion, the first terminal is disconnected, and the second terminal, the third terminal and the fourth terminal are connected; when the energy router When the function of the router is to convert the power grid, the first terminal is disconnected, and the second terminal, the third terminal and the fourth terminal are connected.

Further, the energy router further includes: a fourth switch disposed between the negative terminal of the rectifier module and the fifth terminal.

Further, when the function of the energy router is energy storage DC/DC conversion or photovoltaic DC/DC conversion, the fifth terminal is turned on; when the function of the energy router is power grid conversion down, the fifth terminal is disconnected.

According to a second aspect of an embodiment of the present disclosure, a power system is provided, including the above energy router.

According to a third aspect of the embodiment of the present disclosure, a switching control method is provided, which is applied to the above-mentioned energy router. The method includes: detecting voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal; according to The voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal determine the function of the energy router; wherein the functions include: power grid conversion, photovoltaic DC/DC Conversion, energy storage DC/DC conversion; according to the function of the energy router, the conduction state of the switching module is controlled, and then the first terminal, the second terminal, the third terminal and the fourth terminal are controlled. Is the terminal conductive?

Further, determining the function of the energy router according to the voltage signal input by the first terminal, the second terminal, the third terminal and the fourth terminal includes: determining the function of the second terminal, the third terminal and the fourth terminal. Whether there are voltage signals input; if the judgment result is yes, determine whether the voltage signals input by the second terminal, the third terminal and the fourth terminal are AC signals or DC signals; if they are DC signals, determine The function of the energy router is photovoltaic DC/DC conversion.

Further, if it is an AC signal, it is determined that the function of the energy router is grid current conversion.

Further, if the determination result is no, it is determined whether the first terminal has a voltage signal input; if yes, it is determined that the function of the energy router is energy storage DC/DC conversion.

Further, controlling the conduction state of the switching module according to the function of the energy router, and then controlling whether the first terminal, the second terminal, the third terminal and the fourth terminal are conductive includes: if the energy The function of the router is energy storage DC/DC current conversion, then the switching module is controlled to switch to the first conduction state, and then the first terminal is controlled to be conductive, the second terminal, the third terminal and the The fourth terminal is disconnected.

Further, if the function of the energy router is energy storage DC/DC conversion, the fourth switch is controlled to be turned on, and then the fifth terminal is controlled to be turned on. The fourth switch is set between the negative terminal and the negative terminal of the rectifier module. between the fifth terminals.

Further, if the function of the energy router is photovoltaic DC/DC current conversion, the switching module is controlled to switch to the second conduction state, and then the first terminal is controlled to be disconnected, and the second terminal and the third terminal are controlled to be disconnected. The terminal and the fourth terminal are electrically connected.

Further, if the function of the energy router is photovoltaic DC/DC conversion, the fourth switch is controlled to be turned on, and then the fifth terminal is controlled to be turned on.

Further, if the function of the energy router is power grid current conversion, the switching module is controlled to switch to the second conduction state, and then the first terminal is controlled to be disconnected, and the second terminal, the third terminal, and the The fourth terminal is turned on.

Further, if the function of the energy router is power grid current conversion, the fifth terminal is controlled to be disconnected.

Further, after controlling the conduction state of the switching module according to the function of the energy router, and then controlling whether the first terminal, the second terminal, the third terminal and the fourth terminal are conductive, the The method also includes: switching the corresponding control strategy according to the function of the energy router.

According to a fourth aspect of an embodiment of the present disclosure, a switching control device is provided, including: a memory configured to store instructions; a processor coupled to the memory, and the processor is configured to execute any one of the above based on instructions stored in the memory methods described in the examples.

According to a fifth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, a computer program is stored thereon, and when the program is executed by a processor, the above switching control method is implemented.

Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with the description, serve to explain principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

Figure 1 is a structural diagram of an existing photovoltaic DC/DC converter;

Figure 2 is a structural diagram of an existing energy storage DC/DC converter;

Figure 3 is a structural diagram of an existing converter;

Figure 4 is a structural diagram of an energy router according to an embodiment of the present disclosure;

Figure 5 is a flow chart of a handover control method according to an embodiment of the present disclosure;

Figure 6 is a flow chart of a handover control method according to another embodiment of the present disclosure;

Figure 7 is a schematic structural diagram of a switching control device according to an embodiment of the present disclosure.

It should be understood that the dimensions of the various components shown in the drawings are not drawn to actual proportions. In addition, the same or similar reference numbers indicate the same or similar components.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be described in further detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present disclosure. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this disclosure.

The terminology used in the embodiments of the present disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. As used in the embodiments of this disclosure and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. Usually contains at least two kinds.

It should be understood that the term "and/or" used in this article is only an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, and A and A exist simultaneously. B, there are three situations of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe switches in embodiments of the present disclosure, these switches should not be limited to these terms. These terms are only used to distinguish switches in different positions. For example, without departing from the scope of the embodiments of the present disclosure, the first switch may also be called a second switch, and similarly, the second switch may also be called a first switch.

Depending on the context, the words "if" or "if" as used herein may be interpreted as "when" or "when" or "in response to determination" or "in response to detection." Similarly, depending on the context, the phrase "if determined" or "if (stated condition or event) is detected" may be interpreted as "when determined" or "in response to determining" or "when (stated condition or event) is detected )" or "in response to detecting (a stated condition or event)".

It should also be noted that the terms "includes", "includes" or any other variation thereof are intended to cover non-exclusive inclusive, so that a good or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements that are inherent to such a good or device. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of other identical elements in the goods or devices including the stated element.

The inventor noticed that in the related technology, the three systems of photovoltaic DC/DC converter, energy storage DC/DC converter and grid converter adopt different hardware structures, resulting in the function of each system being completed after construction. Then it was determined that it could not be flexibly switched to other functions.

Accordingly, the present disclosure provides a switching solution that enables the energy router to flexibly switch between different functions.

Optional embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

As shown in Figure 1 mentioned above, the energy storage DC/DC converter includes high-voltage side DC input terminal VH+, output terminal VH-, high-voltage side main circuit contactor K3, high-voltage side charging circuit contactor K1, high-voltage side Charging resistor R1, high-voltage side bus capacitor C1, switching tubes S1~S6 and their anti-parallel diodes D1~D6, the emitter of switching tube S1 and the collector of switching tube S2 are connected to the inductor L1; the emitter of switching tube S3 Inductor L2 is connected to the collector of switch S4; inductor L3 is connected between the emitter of switch S5 and the collector of switch S6; low-voltage side bus capacitor C2, low-voltage side main circuit contactor K4, and low-voltage side charging circuit contactor K2, low-voltage side charging resistor R2; low-voltage side DC input terminal VL+, output terminal VL-.

As shown in Figure 2 mentioned above, the photovoltaic DC/DC converter includes high-voltage side DC input terminal VH+, output terminal VH-, high-voltage side main circuit contactor K3; high-voltage side charging circuit contactor K1, high-voltage side charging Resistor R1, high-voltage side bus capacitor C1, diodes D1, D3, D5, switching tubes S2, S4, S6 and diodes D2, D4, D6 connected in anti-parallel with them; the inductor is connected between the anode of diode D1 and the collector of switching tube S2 L1; the anode of diode D3 and the collector of switch tube S4 are connected to inductor L2; the anode of diode D5 and the collector of switch tube S6 are connected to inductor L3. It also includes three photovoltaic input interfaces PV1+, PV2+, PV3+ and output terminal PV. -.

As shown in Figure 3 mentioned above, the power grid converter includes a high-voltage side DC input terminal VH+, an output terminal VH-, a high-voltage side main circuit contactor K3, a high-voltage side charging circuit contactor K1, and a high-voltage side charging resistor R1; High-voltage side bus capacitor C1; switching tubes S1 to S6 and diodes D1 to D6 connected in reverse parallel with them; inductor L1 is connected between the emitter of switching tube S1 and the collector of switching tube S2; the emitter of switching tube S3 and switching tube S4 Inductor L2 is connected between the collector of switch tube S5; inductor L3 is connected between the emitter of switch tube S5 and the collector of switch tube S6; three-phase AC is connected to terminals R, S, and T.

As can be seen from Figures 1 to 3, there are three types of photovoltaic DC/DC converters, energy storage DC/DC converters, and grid converters. The system realizes different functions through different structures. Once the hardware structure of the converter in the power system is determined, its functions are determined. The problem of being unable to flexibly switch to other functions leads to a waste of hardware costs.

In order to solve the above problems, this embodiment provides an energy router. Figure 4 is a structural diagram of an energy router according to an embodiment of the present disclosure. As shown in Figure 4, the energy router includes: a first terminal VL+ for connecting to a storage device. The positive electrode of the energy battery; the second terminal PV1+/R, the third terminal PV2+/S and the fourth terminal PV3+/T are used to connect the three-phase input terminals of the AC power grid respectively, or to connect the positive electrodes of three photovoltaic power generation modules respectively; The five-terminal VL-/PV- is used to connect one of the above negative electrodes of the energy storage battery, the neutral line of the AC grid, and the negative electrode of the photovoltaic power generation module; the switching module 10 has its first end connected to the rectifier module 20 and its second end The first terminal VL+, the second terminal PV1+/R, the third terminal PV2+/S and the fourth terminal PV3+/T are connected respectively for receiving the control instruction of the control chip and controlling all the components according to the control instruction. Whether the first terminal VL+, the second terminal PV1+/R, the third terminal PV2+/S and the fourth terminal PV3+/T are conductive.

The energy router in this embodiment switches the conductive terminals in the energy router through the switching module, thereby controlling the energy router to flexibly switch between the three functions of photovoltaic DC/DC conversion, energy storage DC/DC conversion and power grid conversion. It can integrate the three functions of photovoltaic DC/DC converter, energy storage DC/DC converter and grid converter through the same hardware, saving hardware costs.

As shown in Figure 4, the switching module 10 includes: a first switch K5, the first end of which is connected between the upper and lower bridge arms of the first rectifier bridge of the rectifier module 20, and the second end is connected to the first terminal VL+, The third end is connected to the second terminal PV1+/R; the second switch K6 has a first end connected between the upper and lower arms of the second rectifier bridge of the rectifier module 20, a second end connected to the first terminal VL+, and a third end of the second switch K6. terminal is connected to the third terminal PV2+/S; the first terminal of the third switch K7 is connected to between the upper and lower bridge arms of the third rectifier bridge of the rectifier module 20, the second terminal is connected to the first terminal VL+, and the third terminal is connected to The fourth terminal PV3+/T.

In order to realize the switching function, the first switch K5, the second switch K6, and the third switch are single-pole double-throw switches, specifically single-pole double-throw relays. The static contact of the first relay is connected to the third terminal of the rectifier module 20 through the inductor L1. Between the upper and lower arms of the rectifier bridge, the first movable contact 1 is connected to the first terminal VL+, and the second movable contact 2 is connected to the second terminal PV1+/R; the static contact of the second relay passes through the inductor L2 Between the upper and lower arms of the second rectifier bridge connected to the rectifier module 20, the first movable contact 1 is connected to the first terminal VL+, the second movable contact 2 is connected to the third terminal PV2+/S; the static contact of the third relay The inductor L3 is connected between the upper and lower arms of the third rectifier bridge of the rectifier module 20 , the first movable contact 1 is connected to the first terminal VL+, and the second movable contact 2 is connected to the fourth terminal PV3+/T.

In order to control whether the fifth terminal is conductive, the energy router also includes: a fourth switch K8, which is set at between the negative terminal of the flow module 20 and the fifth terminal VL-/PV-.

To sum up, the energy router of this embodiment includes: the high-voltage side DC input terminal VH+, the output terminal VH-, the switch tubes S1 to S6 and their anti-parallel diodes D1 to D6, the emitter of the switch tube S1 and the switch tube. The inductor L1 is connected between the collector of S2; the inductor L2 is connected between the emitter of the switch S3 and the collector of the switch S4; the inductor L3 is connected between the emitter of the switch S5 and the collector of the switch S6; the right side of the inductor L1~L3 Connect the static contacts of the first switch K5, the second switch K6, and the second switch K7 respectively; the fourth switch K8 is connected to the common emitter of the switch tubes S2, S4, and S6; the low-voltage side DC terminal includes: the first terminal VL+, with It is used to connect the positive electrode of the energy storage battery; the second terminal PV1+/R, the third terminal PV2+/S and the fourth terminal PV3+/T are used to connect the three-phase input terminals of the AC power grid respectively, or to connect the three-phase input terminals of the three photovoltaic power generation modules respectively. Positive electrode; the fifth terminal VL-/PV- is used to connect the negative electrode of the energy storage battery, the neutral line of the AC power grid, and the negative electrode of the photovoltaic power generation module. Among them, the first switch K5, the second switch K6, the second Switch K7 is a single pole double throw relay.

In some embodiments, the present disclosure provides a power system, including the energy router in the above embodiment, for integrating photovoltaic DC/DC conversion, energy storage DC/DC conversion and grid conversion through the same hardware. function, saving hardware costs.

In some embodiments, the present disclosure provides a switching control method, which is applied to the energy router in the above embodiments. Figure 5 is a flow chart of a switching control method according to an embodiment of the present disclosure. As shown in Figure 5, the method include:

S101. Detect the voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal.

S102, determine the function of the energy router according to the voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal; wherein, the above functions include: power grid conversion, photovoltaic DC/DC conversion, energy storage DC/DC Change flow.

S103: Control the conduction state of the switching module according to the function of the energy router, and then control whether the first terminal, the second terminal, the third terminal, the fourth terminal and the fifth terminal are conductive.

The switching control method of this embodiment determines the function of the energy router according to the voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal; controls the conduction state of the switching module according to the function of the energy router, and then By controlling whether the first terminal, the second terminal, the third terminal, the fourth terminal and the fifth terminal are connected, it is possible to control the energy router in photovoltaic DC/DC conversion and energy storage DC. Flexible switching between /DC converter and grid converter functions.

Since the voltage signal output by the energy storage battery has only one phase, the voltage signal output by the photovoltaic module and the grid voltage signal have three phases, and the voltage signal input by the photovoltaic module is a DC signal, and the three-phase voltage signal input by the grid is AC. signal, in order to accurately distinguish the voltage signals output by the energy storage battery, power grid and photovoltaic module, and then accurately determine the function that the energy converter will enter, it is determined based on the voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal. The function of the energy router includes: determining whether the second terminal, the third terminal and the fourth terminal all have voltage signal input; if the determination result is yes, then determining whether the second terminal, the Whether the voltage signal input by the third terminal and the fourth terminal is a DC signal or an AC signal; if it is a DC signal, it is determined that the function of the energy router is photovoltaic DC/DC conversion; if it is an AC signal, it is determined that the function of the energy router is for power grid current conversion; if the judgment result is no, it is judged whether there is a voltage signal input to the first terminal; if yes, it is determined that the function of the energy router is energy storage DC/DC converter; if not, it is considered that there is no power supply connection Enter and control the energy router to power off.

Control the conduction state of the switching module according to the function of the energy router, and then control whether the first terminal, the second terminal, the third terminal, the fourth terminal and the fifth terminal are conductive, Including: if the function of the energy router is energy storage DC/DC conversion, controlling the switching module to switch to the first conduction state, that is, controlling the conduction of the first switch, the second switch, and the first moving contact of the second switch. is turned on, and then controls the first terminal to be turned on, and controls the fourth switch to be turned on, and then controls the fifth terminal to be turned on; if the function of the energy router is photovoltaic DC/DC conversion, then the switching module is controlled to switch to The second conduction state is to control the conduction of the first switch, the second switch, and the second movable contact of the second switch, thereby controlling the conduction of the above-mentioned second terminal, the third terminal, and the fourth terminal, and The fourth switch is controlled to be turned on, and then the fifth terminal is controlled to be turned on.

If the function of the energy router is power grid current conversion, the switching module is controlled to switch to the second conduction state, that is, the first switch, the second switch, and the second movable contact of the second switch are controlled to be conductive, thereby controlling the above-mentioned third The two terminals, the third terminal, and the fourth terminal are electrically connected.

Since the control strategies under different functions are different, the conduction state of the switching module is controlled according to the function of the energy router, and then the first terminal, the second terminal, the third terminal, the fourth terminal and After whether the fifth terminal is turned on, the above method further includes: switching the corresponding control strategy according to the function of the energy router.

Figure 6 is a flow chart of a switching control method according to another embodiment of the present disclosure. As shown in Figure 5, the method includes the following preferred steps:

S1, system initialization.

S2, detects the voltage signal input by each terminal.

S3: Determine whether the second terminal, the third terminal and the fourth terminal all have voltage signals input. If yes, step S5 is executed. If not, step S4 is executed.

S4: Determine whether there is a voltage signal input to the first terminal. If yes, step S12 is executed. If not, step S11 is executed.

S5: Determine whether the voltage signal input by the second terminal, the third terminal and the fourth terminal is a DC signal or an AC signal. If it is an AC signal, step S6 is executed. If it is a DC signal, step S9 is executed.

S6 controls the second movable contacts of the first switch, the second switch, and the third switch to be conductive, thereby controlling the first terminal to be disconnected, and the second terminal, the third terminal, and the fourth terminal to be conductive.

The voltage signal input by the photovoltaic module is a DC signal, and the three-phase voltage signal input by the power grid is an AC signal. If the voltage signal input by the second terminal, the third terminal and the fourth terminal is a DC signal, it indicates the connected photovoltaic module, so , the function of the energy router should be switched to photovoltaic DC/DC conversion.

S7 controls the fourth switch to turn on, and then controls the fifth terminal to turn on.

S8, the control strategy is the photovoltaic DC/DC converter control strategy.

S9 controls the second movable contact of the first switch, the second switch, and the third switch to conduct, thereby controlling the first terminal to disconnect, the second terminal, the third terminal, and the fourth terminal to conduct, and controls the fourth switch. Disconnect to control the disconnection of the fifth terminal.

S10, the control strategy is the grid converter control strategy.

S11, control the energy router to power off.

If there is no voltage signal input to the first terminal, the second terminal, the third terminal, and the fourth terminal, it means there is no power supply. Just control the energy router to power off.

S12: Control the first movable contact of the first switch, the second switch, and the third switch to be turned on, and then control the first terminal to be turned on, and the second terminal, the third terminal, and the fourth terminal to be turned off.

S13, control the fourth switch to be turned on, and then control the fifth terminal to be turned on.

S14, the control strategy is switched to the energy storage DC/DC converter control strategy.

S15, control the normal operation of the energy router.

In some embodiments, the present disclosure provides a control device. As shown in FIG. 7 , the control device includes a memory 71 and a processor 72 .

The memory 71 is used to store instructions, and the processor 72 is coupled to the memory 71 . The processor 72 is configured to execute the method involved in any embodiment of FIG. 5 or FIG. 6 based on the instructions stored in the memory.

As shown in Figure 7, the control device also includes a communication interface 73 for information interaction with other devices. At the same time, the control device also includes a bus 74, through which the processor 72, the communication interface 73, and the memory 71 complete communication with each other.

The memory 71 may include high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 71 may also be a memory array. The memory 71 may also be divided into blocks, and the blocks may be combined into virtual volumes according to certain rules.

Additionally, processor 72 may be a central processing unit (CPU), or may be an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present disclosure.

In some embodiments, the present disclosure provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the switching control method of the above embodiments is implemented. For example, the computer-readable storage medium is a non-transitory computer-readable storage medium.

Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the part of the above technical solution that essentially contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., including a number of instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure, but not to limit it; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be Modifications may be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions may be made to some of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

An energy router including:

The first terminal is used to connect the positive electrode of the energy storage battery;

The second terminal, the third terminal and the fourth terminal are used to connect the three-phase input terminals of the AC power grid respectively, or to connect the positive poles of three photovoltaic power generation modules respectively;

The fifth terminal is used to connect the negative electrode of the energy storage battery, the neutral line of the AC power grid, or the negative electrode of the photovoltaic power generation module;

The switching module has a first end connected to the rectifier module and a second end connected to the first terminal, the second terminal, the third terminal and the fourth terminal respectively, for controlling the third terminal according to the control instruction. Whether the first terminal, the second terminal, the third terminal, and the fourth terminal are conductive.
The energy router according to claim 1, wherein the switching module includes:

A first switch, a first end of which is connected between the upper and lower arms of the first rectifier bridge of the rectifier module, a second end of which is connected to the first terminal, and a third end of which is connected to the second terminal;

A second switch has a first end connected between the upper and lower arms of the second rectifier bridge of the rectifier module, a second end connected to the first terminal, and a third end connected to the third terminal;

The third switch has a first end connected between the upper and lower arms of the third rectifier bridge of the rectifier module, a second end connected to the first terminal, and a third end connected to the fourth terminal.
The energy router according to claim 2, wherein the first switch, the second switch and the third switch are single pole double throw switches.
The energy router according to claim 1, wherein,

When the function of the energy router is energy storage DC/DC conversion, the first terminal is turned on, and the second terminal, the third terminal and the fourth terminal are turned off;

When the function of the energy router is photovoltaic DC/DC conversion, the first terminal is disconnected, and the second terminal, the third terminal and the fourth terminal are connected;

When the function of the energy router is power grid current conversion, the first terminal is disconnected, and the second terminal, the third terminal and the fourth terminal are connected.
The energy router according to claim 1, wherein the energy router further includes:

A fourth switch is provided between the negative terminal of the rectifier module and the fifth terminal.
The energy router according to claim 5, wherein,

When the function of the energy router is energy storage DC/DC conversion or photovoltaic DC/DC conversion, the fifth terminal is turned on;

When the function of the energy router is power grid current conversion, the fifth terminal is disconnected.
A power system including the energy router according to any one of claims 1 to 6.
A switching control method applied to the energy router according to any one of claims 1 to 4, wherein the method includes:

detecting voltage signals input to the first terminal, the second terminal, the third terminal and the fourth terminal;

The function of the energy router is determined according to the voltage signal input by the first terminal, the second terminal, the third terminal and the fourth terminal; wherein the function includes: power grid conversion, photovoltaic DC/ DC converter, energy storage DC/DC converter;

According to the function of the energy router, the conduction state of the switching module is controlled, thereby controlling whether the first terminal, the second terminal, the third terminal and the fourth terminal are conductive.
The method according to claim 8, wherein determining the function of the energy router according to the voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal includes:

Determine whether the second terminal, the third terminal and the fourth terminal all have voltage signal input;

If the determination result is yes, determine whether the voltage signal input by the second terminal, the third terminal and the fourth terminal is an AC signal or a DC signal;

If it is a DC signal, determine that the function of the energy router is photovoltaic DC/DC conversion.
The method according to claim 9, wherein determining the function of the energy router according to the voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal includes:

If it is an AC signal, it is determined that the function of the energy router is grid current conversion.
The method according to claim 10, wherein determining the function of the energy router according to the voltage signals input by the first terminal, the second terminal, the third terminal and the fourth terminal includes:

If the judgment result is no, then judge whether the first terminal has a voltage signal input;

If yes, it is determined that the function of the energy router is energy storage DC/DC conversion.
The method according to claim 8, wherein the conduction state of the switching module is controlled according to the function of the energy router, thereby controlling the first terminal, the second terminal, the third terminal and the fourth terminal. Whether the terminals are connected includes:

If the function of the energy router is energy storage DC/DC current conversion, the switching module is controlled to switch to the first conduction state, and then the first terminal is controlled to be conductive, and the second terminal, the third terminal and The fourth terminal is disconnected.
The method according to claim 12, wherein the conduction state of the switching module is controlled according to the function of the energy router, thereby controlling the first terminal, the second terminal, the third terminal and the fourth terminal. Whether the terminals are connected includes:

If the function of the energy router is energy storage DC/DC conversion, the fourth switch is controlled to be turned on, and then the fifth terminal is controlled to be turned on. The fourth switch is set between the negative terminal of the rectifier module and the third between five terminals.
The method according to claim 13, wherein the conduction state of the switching module is controlled according to the function of the energy router, thereby controlling the first terminal, the second terminal, the third terminal and the fourth terminal. Whether the terminals are connected includes:

If the function of the energy router is photovoltaic DC/DC conversion, the switching module is controlled to switch to the second conduction state, and then the first terminal is controlled to be disconnected, and the second terminal, the third terminal, and the The fourth terminal is turned on.
The method of claim 14, wherein the conduction state of the switching module is controlled according to the function of the energy router, thereby controlling the first terminal, the second terminal, the third terminal and the fourth terminal. Whether the terminals are connected includes:

If the function of the energy router is photovoltaic DC/DC current conversion, the fourth switch is controlled to be turned on, and then the fifth terminal is controlled to be turned on.
The method according to claim 15, wherein the conduction state of the switching module is controlled according to the function of the energy router, thereby controlling the first terminal, the second terminal, the third terminal and the fourth terminal. Whether the terminals are connected includes:

If the function of the energy router is power grid current conversion, the switching module is controlled to switch to the second conduction state, and then the first terminal is controlled to be disconnected, and the second terminal, the third terminal, and the fourth terminal are conduction.
The method according to claim 16, wherein the conduction state of the switching module is controlled according to the function of the energy router, thereby controlling the first terminal, the second terminal, the third terminal and the fourth terminal. Whether the terminals are connected includes:

If the function of the energy router is power grid current conversion, the fifth terminal is controlled to be disconnected.
The method according to claim 8, wherein the conduction state of the switching module is controlled according to the function of the energy router, thereby controlling the first terminal, the second terminal, the third terminal and the fourth terminal. After checking whether the terminal is connected, the method further includes:

The corresponding control strategy is switched according to the function of the energy router.
A switching control device including:

memory configured to store instructions;

A processor, coupled to the memory, the processor being configured to execute the method according to any one of claims 8-18 based on instructions stored in the memory.
A computer-readable storage medium having a computer program stored thereon, which implements the method according to any one of claims 8 to 18 when executed by a processor.