CN111262336A - A flexible uninterruptible power supply device and its control method and system - Google Patents

Abstract

The application discloses a flexible uninterruptible power supply device comprising an AC bus, a DC bus, a first switch, a DC-AC converter, a battery pack, a first DC-DC converter, at least one second DC-DC converter, The second switch and the third switch. One end of the first switch is used to connect the mains network, and the other end is connected to the AC bus; both ends of the DC-AC converter are electrically connected to the DC bus and the AC bus respectively; the input end of the first DC-DC converter is connected to the The second switch is electrically connected to the battery pack, and the output terminal is electrically connected to the DC bus; the input terminal of the second DC-DC converter is used to connect the renewable resource power generation device, and the output terminal is electrically connected to the DC bus. One end of the third switch is electrically connected with the AC bus, and the other end is electrically connected with the internal combustion engine power generation device. The battery pack supplies power to the electrical load only for a limited time, thereby achieving the purpose of protecting the battery pack and reducing the use cost.

Description

A flexible uninterruptible power supply device and its control method and system

technical field

The present application relates to the field of power supply technology, and more particularly, to a flexible uninterruptible power supply device and a control method and system thereof.

Background technique

UPS (Uninterruptible Power Supply, uninterruptible power supply) is one of the commonly used devices for the current important load backup power supply. It has the characteristics of simple topology structure and single power supply. It has a wide range of applications in the market and is widely used in data centers, medical equipment, substations Important loads such as secondary protection equipment and railway core equipment.

UPS is generally composed of a battery bank, an inverter and a control circuit; one end of the UPS is connected to the distribution network, and the other end is connected to the electrical load. When the grid voltage is normal, the UPS uses the grid power to charge its own battery pack. When the grid is abnormal, The UPS releases the electric energy of the battery bank for the use of the electric load.

However, the current UPS access power supply is too simple, basically only the battery pack. If there is a large-scale power outage or frequent power outages in the mains, the configured battery pack will be over-discharged, resulting in a shorter battery pack replacement cycle, resulting in its use cost. higher.

SUMMARY OF THE INVENTION

In view of this, the present application provides a flexible uninterruptible power supply device and a control method and system thereof, which are used to solve the problem of high use cost caused by over-discharge of the current uninterruptible power supply.

In order to achieve the above purpose, the proposed scheme is as follows:

A flexible uninterruptible power supply device includes an AC bus, a DC bus, a first switch, a DC-AC converter, a battery pack, a first DC-DC converter, at least one second DC-DC converter, and a second switch and the third switch, where:

The AC bus is used for outputting electric energy to the electric load;

One end of the first switch is used for connecting to the mains network, and the other end is connected to the AC bus, and is configured to be closed when the power supply of the mains network is normal, and disconnected when the power supply is abnormal;

The input end of the DC-AC converter is electrically connected to the DC busbar, and the output end is electrically connected to the AC busbar, and is configured to use the DC voltage of the DC busbar to send the DC voltage to the AC bus when the mains network is abnormal. The AC busbar outputs AC power, and stops working when the power supply of the mains network is normal;

The input end of the first DC-DC converter is electrically connected to the battery pack, and the output end is electrically connected to the DC bus;

The input end of the second DC-DC converter is used to connect the renewable resource power generation device, and the output end is electrically connected to the DC bus.

The second switch is arranged on the wire for connecting the first DC-DC converter and the battery pack, and is configured to be disconnected when the mains network is powered normally, and is also configured to be disconnected when all the power is supplied. When the power supply of the mains network is abnormal and the power supply of the renewable resource power generation device to the DC bus is abnormal, it is also configured to be closed when the power supply of the mains network is abnormal and the power supply of the renewable resources power generation device to the DC bus is abnormal. Disconnect when the bus power supply is normal;

One end of the third switch is electrically connected to the AC bus, and the other end is electrically connected to the internal combustion engine power generation device, and is configured to be turned on when the mains network supplies power and the renewable resource power generation device operates abnormally.

Optionally, there are two second DC-DC converters, wherein:

An output end of one of the second DC-DC converters is electrically connected to the DC bus, and the other end is electrically connected to a solar power generating device;

Another output end of the second DC-DC converter is electrically connected to the DC bus, and the other end is electrically connected to the wind-driven DC power generation device.

A control method, applied to the above-mentioned flexible uninterruptible power supply device, the control method comprising:

obtaining the power supply status of the mains network;

When the power supply of the mains network is abnormal, the storage battery group, the renewable resource power generation device or the internal combustion generator group is controlled to supply power to the electricity load.

Optionally, the controlling the battery pack, the renewable resource power generating device or the internal combustion power generating set to supply power to the electricity load according to the operating state includes:

When the operating state of the renewable resource power generation device is normal, the first switch is controlled to be turned off, and the second DC-DC converter is controlled to work, so that the electrical energy output by the renewable resource power generation device is delivered to the DC bus;

When the operating state of the renewable resource power generation device is abnormal, controlling the third switch to be closed, so that the internal combustion power generation device transmits electric energy to the AC bus;

When both the operation state of the renewable resource power generation device and the operation state of the internal combustion power generation device are abnormal, the second switch is controlled to be closed.

Optionally, also include:

When the power supply of the mains network is normal, the renewable resource power generation device is controlled to charge the battery pack.

Optionally, the controlling the renewable resource power generation device to charge the battery pack includes:

controlling the second switch to be closed;

The first DC-DC conversion device is controlled to obtain electrical energy from the DC bus and output it to the battery pack.

A control system, applied to the above-mentioned flexible uninterruptible power supply device, wherein the control system includes:

a state detection module for detecting the power supply state of the mains network;

The switching control module is configured to control the battery pack, the renewable resource power generation device or the internal combustion generator set to supply power to the electricity load when the power supply of the mains network is abnormal.

Optionally, the switching control system includes:

a first control unit, configured to control the first switch to turn off and control the second DC-DC converter to work when the operating state of the renewable resource power generation device is normal, so as to make the renewable resource The electrical energy output by the power generating device is delivered to the DC bus;

a second control unit, configured to control the third switch to be closed when the operating state of the renewable resource power generation device is abnormal, so that the internal combustion power generation device transmits electrical energy to the AC bus;

A third control unit, configured to control the second switch to be closed when both the operation state of the renewable resource power generation device and the operation state of the internal combustion power generation device are abnormal.

Optionally, also include:

The charging control module is configured to control the renewable resource power generation device to charge the battery pack when the power supply of the mains network is normal.

Optionally, the charging control module includes:

a fourth control unit, configured to control the second switch to be closed;

A fifth control unit, configured to control the first DC-DC conversion device to obtain electrical energy from the DC bus and output it to the battery pack.

It can be seen from the above technical solutions that the present application discloses a flexible uninterruptible power supply device comprising an AC bus, a DC bus, a first switch, a DC-AC converter, a battery pack, a first DC-DC converter, at least A second DC-DC converter, second switch and third switch. One end of the first switch is used to connect the mains network, and the other end is connected to the AC bus; the input end of the DC-AC converter is electrically connected to the DC bus, and the output end is electrically connected to the AC bus; The input terminal is electrically connected to the battery pack through the second switch, and the output terminal is electrically connected to the DC bus; the input terminal of the second DC-DC converter is used to connect the renewable resource power generation device, and the output terminal is electrically connected to the DC bus. One end of the third switch is electrically connected with the AC bus, and the other end is electrically connected with the internal combustion engine power generation device. The battery pack only supplies power to the electrical load through the DC-AC converter when the renewable resource power generation device fails to work normally, thereby reducing the use time and intensity of the battery pack, thus achieving the purpose of protecting the battery pack and extending the It prolongs the working life of the battery pack and effectively reduces the cost of use.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is a block diagram of a flexible uninterruptible power supply according to an embodiment of the application;

2 is a block diagram of another flexible uninterruptible power supply according to an embodiment of the application;

3 is a block diagram of another flexible uninterruptible power supply according to an embodiment of the application;

4 is a flowchart of a control method according to an embodiment of the present application;

5 is a flowchart of another control method according to an embodiment of the present application;

6 is a block diagram of a control system according to an embodiment of the application;

FIG. 7 is a block diagram of another control system according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Example 1

FIG. 1 is a block diagram of a flexible uninterruptible power supply device according to an embodiment of the present application.

As shown in FIG. 1 , the flexible uninterruptible power supply device provided in this embodiment is used to supply power to the electrical load by using the battery pack and the renewable resource power generation device when the power supply of the mains network is abnormal. The device specifically includes a first switch k1, a The second switch k2 , the third switch k3 , the AC bus 10 , the DC bus 20 , the DC-AC converter 30 , the first DC-DC converter 40 , at least one second DC-DC converter 50 and the battery pack 60 .

One end of the first switch is used to connect the mains network through a cable, and the other end is connected to the AC bus, so that the AC of the mains network is output to the AC bus, and the electrical load is connected to the AC bus through the corresponding cable. connect.

In addition, the flexible uninterruptible power supply in this embodiment will be connected with the battery pack, the renewable resource power generation device 100 and the internal combustion power generation device 200, so as to use the battery pack, the renewable resource power generation device and/or The internal combustion power plant supplies power to the electrical load.

In order to achieve the above purpose, the input end of the first DC-DC converter is electrically connected to the DC bus, the output end is electrically connected to the battery pack, and the second switch is provided on the cable for connecting the input end and the battery pack.

The input end of the second DC-DC converter is connected to the renewable resource power generation device, and the output end is connected to the DC bus. When the second DC-DC converter is working, the electrical energy output by the renewable resource power generation device passes through the second The power conversion of the DC-DC converter is output to the DC bus.

One end of the third switch is connected with the AC bus, and the other end is electrically connected with the internal combustion power generation device.

The above-mentioned first switch is closed when the mains network is normal, and the DC-AC converter stops working. At this time, only the mains network supplies power to the electrical load through the AC bus. When the mains network is abnormal, in order to ensure the normal power consumption of the electrical load, the first switch is turned off at this time, the DC-foot force converter takes power from the DC bus, and outputs the converted AC to the AC bus.

The DC power on the DC bus comes from the battery pack or the renewable resource power generation device. In view of the fact that the second switch is arranged on the wire connecting the first DC-DC converter and the battery pack, when the renewable resource power generation device is normal, the second switch can be controlled to be turned off, so that the power generated by the renewable resource power generation device can be used to The power supply is supplied by the electric load, which can reduce the use time and intensity of the battery pack, so as to realize the protection of the battery pack.

The third switch is closed when neither the mains network nor the battery combined renewable resource power generation device can work. At this time, the energy generated by the internal combustion generator set can directly enter the AC bus through the third switch, so that the electric load can be used to continue to work.

It can be seen from the above technical solutions that this embodiment provides a flexible uninterruptible power supply device including an AC bus, a DC bus, a first switch, a DC-AC converter, a battery pack, a first DC-DC converter, at least A second DC-DC converter, second switch and third switch. One end of the first switch is used to connect the mains network, and the other end is connected to the AC bus; the input end of the DC-AC converter is electrically connected to the DC bus, and the output end is electrically connected to the AC bus; The input terminal is electrically connected to the battery pack through the second switch, and the output terminal is electrically connected to the DC bus; the input terminal of the second DC-DC converter is used to connect the renewable resource power generation device, and the output terminal is electrically connected to the DC bus. One end of the third switch is electrically connected with the AC bus, and the other end is electrically connected with the internal combustion engine power generation device. The battery pack only supplies power to the electrical load through the DC-AC converter when the renewable resource power generation device fails to work normally, thereby reducing the use time and intensity of the battery pack, thus achieving the purpose of protecting the battery pack and extending the It prolongs the working life of the battery pack and effectively reduces the cost of use.

In addition, renewable resources generally include wind energy and solar energy. In view of this, these two renewable resource power generation devices, namely photovoltaic power generation devices and wind energy power generation devices, can be connected to the flexible uninterruptible power supply, and the corresponding second DC-DC converter is Two, as shown in FIG. 2 , one of the second DC-DC converters is used to connect the photovoltaic power generation device 101 to the DC bus, and the other second DC-DC converter is used to connect the wind power generation device 102 to the DC bus.

In addition, the wind energy power generation device in Figure 2 is limited to the DC wind energy power generation device that emits DC power. For the AC wind energy power generation device that directly emits AC power, the wind energy power generation device can be connected to the AC busbar support to realize the power supply to the electrical load. As shown in Figure 3.

Embodiment 2

FIG. 4 is a flowchart of a control method according to an embodiment of the present application.

As shown in FIG. 4 , the control method provided in this embodiment is applied to the flexible uninterruptible power supply device shown in FIG. 1 , and the specific method includes the following steps:

S1. Obtain the power supply status of the mains network.

The power supply status here includes normal power supply and abnormal power supply. Normal power supply means that the mains network can normally transmit power to the flexible uninterruptible power supply in the previous embodiment, and power supply abnormality means that it has a power failure failure and cannot supply power. Obtaining the power supply status of the mains network here may be to detect the voltage of the mains network through a corresponding detection device, or to obtain the power supply status information of a transformer or substation upstream of the mains network through a data network.

S2. When the power supply of the mains network is abnormal, the power supply of the AC bus is switched.

When the power supply of the mains network is abnormal, the first switch is cut off first, that is, the AC bus is disconnected from the mains network. At this time, the battery pack or the renewable resource power generation device is controlled to supply power to the DC bus, or only the internal combustion generator set is controlled to supply power to the AC bus, so that the electrical load can be used to continuously obtain electrical energy. Specifically, the above objects are achieved by the following methods.

When the operating state of the renewable resource power generation device is normal, the first switch is controlled to be turned off, and the second DC-DC converter is controlled to work, so that the electric energy output by the renewable resource power generation device is transmitted to the DC bus; that is, only the use of The energy generated by the renewable resource power generation device to save fuel or reduce the use time of the battery pack.

When the operating state of the renewable resource power generation device is abnormal, the third switch is controlled to be closed, so that the internal combustion power generation device transmits electric energy to the AC bus;

The second switch is controlled to be closed only when the operating state of the renewable resource power generation device and the operating state of the internal combustion power generation device are abnormal, that is, the battery pack is used only when it is unavoidable, so as to maintain the continuity of power supply to the electrical load.

Through the above control, the use time and intensity of the battery pack can be reduced, so as to achieve the purpose of protecting the battery pack, thereby prolonging the working life of the battery pack and effectively reducing the use cost.

Embodiment 3

FIG. 5 is a flowchart of another control method according to an embodiment of the present application.

As shown in FIG. 5 , the control method provided in this embodiment is applied to the flexible uninterruptible power supply device shown in FIG. 1 , and the specific method includes the following steps:

S1. Obtain the power supply status of the mains network.

The power supply status here includes normal power supply and abnormal power supply. Normal power supply means that the mains network can normally transmit power to the flexible uninterruptible power supply in the previous embodiment, and power supply abnormality means that it has a power failure failure and cannot supply power. Obtaining the power supply status of the mains network here may be to detect the voltage of the mains network through a corresponding detection device, or to obtain the power supply status information of a transformer or substation upstream of the mains network through a data network.

S2. When the power supply of the mains network is abnormal, the power supply of the AC bus is switched.

When the power supply of the mains network is abnormal, the first switch is cut off first, that is, the AC bus is disconnected from the mains network. At this time, the battery pack or the renewable resource power generation device is controlled to supply power to the DC bus, or only the internal combustion generator set is controlled to supply power to the AC bus, so that the electrical load can be used to continuously obtain electrical energy. Specifically, the above objects are achieved by the following methods.

When the operating state of the renewable resource power generation device is normal, the first switch is controlled to be turned off, and the second DC-DC converter is controlled to work, so that the electric energy output by the renewable resource power generation device is transmitted to the DC bus; that is, only the use of The energy generated by the renewable resource power generation device to save fuel or reduce the use time of the battery pack.

When the operating state of the renewable resource power generation device is abnormal, the third switch is controlled to be closed, so that the internal combustion power generation device transmits electric energy to the AC bus;

The second switch is controlled to be closed only when the operating state of the renewable resource power generation device and the operating state of the internal combustion power generation device are abnormal, that is, the battery pack is used only when it is unavoidable, so as to maintain the continuity of power supply to the electrical load.

Through the above control, the use time and intensity of the battery pack can be reduced, so as to achieve the purpose of protecting the battery pack, thereby prolonging the working life of the battery pack and effectively reducing the use cost.

S3. When the mains network is normal, use the renewable resource power generation device to charge the battery pack.

That is, when the mains network is normal, the mains network is used to supply power to the electrical load, and the first switch is closed at this time;

In addition, the second switch is controlled to be closed, and the second DC-DC converter is controlled to work, so that the energy generated by the renewable resource power generation device continues to enter the DC bus, and at this time, the first DC-DC power generation device is controlled to output reversely, and the DC The electric energy on the bus is charged into the battery pack, so that the battery pack can be charged with the power generated by the free renewable resource power generation device, thereby saving costs.

Embodiment 4

FIG. 6 is a block diagram of a control system according to an embodiment of the present application.

As shown in FIG. 6 , the control system provided in this embodiment is applied to the flexible uninterruptible power supply device shown in FIG. 1 , and specifically includes a state detection module 70 and a switching control module 80 .

The state detection module is used to obtain the power supply state of the mains network.

The power supply status here includes normal power supply and abnormal power supply. Normal power supply means that the mains network can normally transmit power to the flexible uninterruptible power supply in the previous embodiment, and power supply abnormality means that it has a power failure failure and cannot supply power. The module may detect the voltage of the mains network through a corresponding detection device, or obtain the power supply status information of the transformer or substation upstream of the mains network through a data network.

The switching control module is used to switch the power supply of the AC bus when the power supply of the mains network is abnormal.

When the power supply of the mains network is abnormal, the first switch is cut off first, that is, the AC bus is disconnected from the mains network. At this time, the battery pack or the renewable resource power generation device is controlled to supply power to the DC bus, or only the internal combustion generator set is controlled to supply power to the AC bus, so that the electrical load can be used to continuously obtain electrical energy. Specifically, the module includes a first control unit, a second control unit and a third control unit.

The first control unit is used to control the opening of the first switch and control the operation of the second DC-DC converter when the operating state of the renewable resource power generation device is normal, so that the electrical energy output by the renewable resource power generation device is transmitted to the DC bus; that is, only the energy generated by the renewable resource power generation device is used to save fuel or reduce the use time of the battery pack.

The second control unit is configured to control the third switch to be closed when the operating state of the renewable resource power generation device is abnormal, so that the internal combustion power generation device transmits electric energy to the AC bus;

The third control unit is used to control the second switch to be closed only when the operating state of the renewable resource power generation device and the operating state of the internal combustion power generation device are abnormal, that is, the battery pack is only used when it is unavoidable, so as to maintain the power consumption Continuity of load power supply.

Through the control of the above-mentioned modules, the use time and intensity of the battery pack can be reduced, so as to achieve the purpose of protecting the battery pack, thereby prolonging the working life of the battery pack and effectively reducing the use cost.

Embodiment 5

FIG. 7 is a block diagram of another control system according to an embodiment of the present application.

As shown in FIG. 7 , in the control system provided in this embodiment, a charging control module 90 is added on the basis of the previous embodiment.

The charging control module is used to charge the battery pack using the renewable resource power generation device when the mains network is normal.

That is, when the mains network is normal, the mains network is used to supply power to the electrical load, and the first switch is closed at this time;

Additionally, the module includes a fourth control unit and a fifth control unit. The fourth control unit is used to control the closing of the second switch, and the fifth control unit is used to control the operation of the second DC-DC converter, so that the energy generated by the renewable resource power generation device continues to enter the DC bus, and at this time, the first DC-DC converter is controlled. The reverse output of the DC power generation device charges the electric energy on the DC bus into the battery pack, so that the battery pack can be charged by using the energy generated by the free renewable resource power generation device, thereby saving costs.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other.

Those skilled in the art should understand that the embodiments of the embodiments of the present application may be provided as methods, apparatuses, or computer program products. Accordingly, the embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The embodiments of the present application are described with reference to the flowcharts and/or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing terminal equipment to produce a machine that causes the instructions to be executed by the processor of the computer or other programmable data processing terminal equipment Means are created for implementing the functions specified in the flow or flows of the flowcharts and/or the blocks or blocks of the block diagrams.

These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing terminal equipment to operate in a particular manner, such that the instructions stored in the computer readable memory result in an article of manufacture comprising instruction means, the The instruction means implement the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing terminal equipment, so that a series of operational steps are performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby executing on the computer or other programmable terminal equipment The instructions executed on the above provide steps for implementing the functions specified in the flowchart or blocks and/or the block or blocks of the block diagrams.

Although the preferred embodiments of the embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the embodiments of the present application.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or terminal device comprising a list of elements includes not only those elements, but also a non-exclusive list of elements. other elements, or also include elements inherent to such a process, method, article or terminal equipment. Without further limitation, an element defined by the phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, article or terminal device comprising said element.

The technical solutions provided by the present application have been described in detail above, and specific examples are used to illustrate the principles and implementations of the present application. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application; At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific embodiments and application scope. To sum up, the content of this specification should not be construed as a limitation to the present application.

Claims (10)

1. A flexible uninterruptible power supply apparatus comprising an ac bus, a dc bus, a first switch, a dc-to-ac converter, a battery pack, a first dc-to-dc converter, at least one second dc-to-dc converter, a second switch, and a third switch, wherein:

the alternating current bus is used for outputting electric energy to an electric load;

one end of the first switch is used for connecting a mains supply network, and the other end of the first switch is connected with the alternating current bus and is configured to be closed when the mains supply network supplies power normally and be opened when the power supply is abnormal;

the input end of the DC-AC converter is electrically connected with the DC bus, the output end of the DC-AC converter is electrically connected with the AC bus, and the DC-AC converter is configured to utilize the DC voltage of the DC bus to output AC electric energy to the AC bus when the power supply of the commercial power network is abnormal, and stop working when the power supply of the commercial power network is normal;

the input end of the first direct current-direct current converter is electrically connected with the storage battery pack, and the output end of the first direct current-direct current converter is electrically connected with the direct current bus;

the input end of the second DC-DC converter is used for connecting a renewable resource power generation device, and the output end of the second DC-DC converter is electrically connected with the DC bus;

the second switch is arranged on a lead for connecting the first direct current-direct current converter and the storage battery pack, is configured to be opened when the mains network supplies power normally, is also configured to be closed when the mains network supplies power abnormally and the renewable resource power generation device supplies power to the direct current bus abnormally, and is also configured to be opened when the mains network supplies power abnormally and the renewable resource power generation device supplies power to the direct current bus normally;

and one end of the third switch is electrically connected with the alternating current bus, and the other end of the third switch is electrically connected with the internal combustion engine power generation device and is configured to be conducted when the power supply of the commercial power network and the renewable resource power generation device are abnormally operated.

2. The flexible uninterruptible power supply device of claim 1, wherein the second dc-dc converters are two, wherein:

the output end of the second direct current-direct current converter is electrically connected with the direct current bus, and the other end of the second direct current-direct current converter is electrically connected with the solar power generation device;

the output end of the other second direct current-direct current converter is electrically connected with the direct current bus, and the other end of the other second direct current-direct current converter is electrically connected with the wind power direct current power generation device.

3. A control method applied to the flexible uninterruptible power supply device according to claim 1, wherein the control method includes:

acquiring the power supply state of the commercial power network;

and when the power supply of the commercial power network is abnormal, controlling the storage battery pack, the renewable resource power generation device or the internal combustion generator set to supply power to the power load.

4. The control method according to claim 3, wherein said controlling the battery pack, the renewable resource power generation device, or the internal combustion generator set to supply power to the electrical load according to the operating state includes:

when the running state of the renewable resource power generation device is normal, controlling the first switch to be switched off, and controlling the second direct current-direct current converter to work, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus;

when the running state of the renewable resource power generation device is abnormal, controlling the third switch to be closed so that the internal combustion power generation device transmits electric energy to the alternating current bus;

and when the running state of the renewable resource power generation device and the running state of the internal combustion power generation device are both abnormal, controlling the second switch to be closed.

5. The control method according to claim 3, further comprising:

and when the power supply of the commercial power network is normal, controlling the renewable resource power generation device to charge the storage battery pack.

6. The control method of claim 5, wherein said controlling said renewable resource power generation device to charge said battery pack comprises:

controlling the second switch to close;

and controlling the first direct current-direct current conversion device to obtain electric energy from the direct current bus and output the electric energy to the storage battery pack.

7. A control system applied to the flexible uninterruptible power supply device according to claim 1, wherein the control system includes:

the state detection module is used for detecting the power supply state of the commercial power network;

and the switching control module is used for controlling the storage battery pack, the renewable resource power generation device or the internal combustion generator set to supply power to the power load when the power supply of the commercial power network is abnormal.

8. The control system of claim 7, wherein the switching control system comprises:

the first control unit is used for controlling the first switch to be switched off and controlling the second direct current-direct current converter to work when the running state of the renewable resource power generation device is normal, so that the electric energy output by the renewable resource power generation device is transmitted to the direct current bus;

the second control unit is used for controlling the third switch to be closed when the running state of the renewable resource power generation device is abnormal, so that the internal combustion power generation device can transmit electric energy to the alternating current bus;

and the third control unit is used for controlling the second switch to be closed when the running state of the renewable resource power generation device and the running state of the internal combustion power generation device are both abnormal.

9. The control system of claim 7, further comprising:

and the charging control module is used for controlling the renewable resource power generation device to charge the storage battery pack when the power supply of the commercial power network is normal.

10. The control system of claim 9, wherein the charge control module comprises:

the fourth control unit is used for controlling the second switch to be closed;

and the fifth control unit is used for controlling the first direct current-direct current conversion device to obtain electric energy from the direct current bus and output the electric energy to the storage battery pack.

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