TECHNICAL FIELD

The invention relates to the field of power distribution systems, in particular to a method for switching a power supply with a quick switching device, and to a quick switching device.

BACKGROUND ART

In many factories, a power distribution system generally has multiple power supplies, with one power supply that is currently supplying power used as a working power supply, and the remaining power supply used as a backup power supply. These power supplies are each connected to a higher level substation, e.g., they may be connected to the same higher level substation but connected to different busbars. In some cases, it is necessary to disconnect the working power supply. In order to ensure uninterrupted power consumption, it is necessary to switch power from a working power supply to a backup power supply as quickly as possible. In the prior art, a quick switching device is generally used to perform the operation of power supply switching.

In the currently available quick switching devices, there are several common activation modes that are set when they come out factories, such as manual activation, fault activation and self-test activation. Manual switching refers to manually triggering the quick switching device to initiate switching, fault switching refers to switching triggered by an external protection and control device (e.g., a relay protection device), and self-test switching refers to a power supply switching automatically triggered internally by the quick switching device, e.g., an operation of triggering power supply switching by a quick switching device in a case where all three-phase voltages on the busbars are lower than an adjusted value for a period of time greater than a threshold. DESCRIPTION OF THE INVENTION

In view of this, the present invention provides a method for switching a power supply with a quick switching device, wherein a power distribution system comprises a quick switching device and at least two power supplies, with one power supply that is currently supplying power used as a working power supply, and the remaining power supply used as a backup power supply, wherein the quick switching device is used to trigger switching between the working power supply and the backup power supply when it is confirmed that the power distribution system satisfies a condition, and the method comprises ■ receiving a target mode, wherein the target mode is used to trigger the quick switching device to start an operation of judging whether to perform power supply switching, and said target mode is determined according to a real-time working condition of the power distribution system! storing the target mode! and judging whether to perform an operation of power supply switching if it is recognized that the quick switching device has been activated in the target mode.

According to the method as described above, optionally, it further comprises ■ judging whether to perform the operation of power supply switching if it is recognized that the quick switching device has been activated in a preset activation mode, wherein the preset activation mode is: manual activation, fault activation, random-tripping activation or self-test activation! if the judgment result is Yes, switching between two power supplies will be triggered.

According to the above method, optionally, the condition for switching corresponding to the target mode comprises at least one of the following conditions: the input current of said working power supply is 0! the working power supply has a negative sequence quantity exceeding an allowable range; the working power supply has a zero sequence quantity exceeding an allowable range; the working power supply has a frequency change rate exceeding an allowable range; the working power supply has a voltage change rate exceeding an allowable range; and the working power supply has a reverse power.

According to the above method, optionally, receiving a target mode comprises ■ receiving, via a preset port, the target mode input by a user through an editing interface.

The present invention also provides a quick switching device that is located in a power system which further comprises at least two power supplies, with one power supply that is currently supplying power used as a working power supply, and the remaining power supply used as a backup power supply, wherein the quick switching device is used to trigger switching between the working power supply and the backup power supply when it is confirmed that the power distribution system satisfies the conditions, wherein, the quick switching device comprises^ a receiving unit for receiving a target mode, wherein the target mode is used to trigger the quick switching device to start an operation of judging whether to perform power supply switching, and said target mode is determined according to a real-time working condition of the power distribution system; a storage unit for storing the target mode; an identification unit, used to identify whether the quick switching device is activated in the target mode, and if the identification result is Yes, a judgment unit will be triggered; and a judgment unit, used to judge whether to perform a power supply switching operation.

According to the quick switching device as described above, optionally, the identification unit is also used to identify whether the quick switching device is activated in a preset activation mode, and the preset activation mode is: manual activation, fault activation, random-tripping activation or self-test activation; if the identification result is Yes, the judgment unit will be triggered.

According to the above quick switching device, optionally, the condition for switching corresponding to the target mode comprises at least one of the following conditions: the input current of said working power supply is 0; the working power supply has a negative sequence quantity exceeding an allowable range; the working power supply has a zero sequence quantity exceeding an allowable range; the working power supply has a frequency change rate exceeding an allowable range; the working power supply has a voltage change rate exceeding an allowable range; and the working power supply has a reverse power.

According to the quick switching device as described above, optionally, the receiving unit is used for: receiving, via a preset port, the target mode input by a user through an editing interface.

The present invention also provides a quick switching device, comprising: at least one memory, for storing an instruction; and at least one processor configured to execute the method for switching the power supply with the quick switching device according to any one of the items above based on instructions stored in the memory.

The present invention also provides a readable storage medium, wherein machine-readable instructions are stored in the readable storage medium, and when the machine-readable instructions are executed by a machine, the machine will execute the method for switching the power supply with the quick switching device according to any one of the items above.

As can be seen from the above solution, users can set the target method for determining the condition for switching between two power supplies by themselves, so that the users can realize personalized settings to satisfy their needs.

DESCRIPTION OF DRAWINGS

Preferred embodiments of the present invention are described in detail below with reference to the drawings, to give those skilled in the art a clearer understanding of the above-mentioned and other features and advantages of the present invention. In the figures^

Figure 1 is a schematic flowchart of a method for switching a power supply with a quick switching device according to an embodiment of the present invention.

Figure 2 is a schematic flowchart of a method for switching a power supply with a quick switching device according to another embodiment of the present invention.

Figure 3 is a schematic structural diagram of a quick switching device according to an embodiment of the present invention. SPECIFIC EMBODIMENTS

In order to make clearer the purposes, technical solutions, and advantages of the present invention, the present invention will be further described below in conjunction with embodiments.

After the quick switching device is triggered to start, it needs to judge whether to perform the power supply switching operation, that is, to judge whether the backup power supply meets the circuit-closing conditions, and after judging that the circuit-closing conditions are met, the backup power supply will be switched on to complete the power supply switching operation. With the increased complexity of the operating conditions of power distribution systems, several activation methods that are preset at factories can no longer meet the needs of customers. Based on this, the present application provides the following method for switching the power supplies with a quick switching device.

EMBODIMENT 1

This embodiment provides a method for switching a power supply with a quick switching device, and the object for executing the method is the quick switching device. The quick switching device is located in a power distribution system which comprises a plurality of power supplies in addition to the quick switching device, where the number of power supplies can be set according to the actual needs, for example, two, three or even more. One power supply that is currently supplying power is used as a working power supply, and the remaining power supply is used as a backup power supply, wherein the quick switching device is used to trigger the switching between the working power supply and the backup power supply when it is confirmed that the power distribution system satisfies the condition for switching corresponding to the activation mode.

Figure 1 is a schematic flowchart of a method for switching a power supply with a quick switching device according to this embodiment. The method comprises^ Step 101, receiving a target mode, wherein the target mode is used to trigger the quick switching device to start the operation of judging whether to perform power supply switching, and the target mode is determined according to a real-time working condition of the power distribution system.

The quick switching device is generally pre-stored with several common activation modes, such as manual activation, fault activation, self-test activation and random-tripping activation. In practice, users will choose one or more activation modes to trigger the quick switching device to start to judge whether to perform the power supply switching operation. If the switching condition is met, the circuit of the backup power supply will be closed to realize the switching between the two power supplies.

In addition, users can determine the desired activation mode, i.e., the target mode, according to the real-time working conditions of their power distribution system, which is the user's personalized need. The target mode may comprise at least one of the following conditions for switching: the input current of said working power supply is 0; the working power supply has a negative sequence quantity exceeding an allowable range; the working power supply has a zero sequence quantity exceeding an allowable range; the working power supply has a frequency change rate exceeding an allowable range; the working power supply has a voltage change rate exceeding an allowable range; and the working power supply has a reverse power.

Specifically, the condition of the working power supply may be monitored directly or indirectly, such as monitoring the end of power supply connected to a substation of a higher level to determine the input current of the working power supply, or monitoring the stator or rotor of the working power supply to obtain the negative sequence quantity, the zero sequence quantity, the frequency change rate or the voltage change rate of the working power supply. The negative sequence quantity or zero sequence quantity of the working power supply may specifically be a negative sequence quantity or zero sequence quantity of the voltage. Both the frequency change rate and the voltage change rate of the working power supply can be realized through continuous monitoring with a sensor. The reverse power of the working power supply is also known as power direction protection, and when the working power supply has reverse power, the reverse power protection action circuit breaker will trip, which can specifically be realized by collecting the voltage and current of the three phases of the working power supply. In the target mode, by directly monitoring the working condition of the working power supply, it is possible to find out whether there is a problem with the working power supply as early as possible, and switch it in time.

As an exemplary illustration, after users have determined the target mode, they may send the target mode to the quick switching device through an editing interface. For example, the quick switching device may receive, via a preset port, the target mode input by a user through an editing interface.

Step 102, storing the target mode.

The quick switching device stores the target mode after receiving the target mode sent by the user. The specific storage method and storage location are not limited, for example, the target mode may be stored in a memory of the quick switching device for easy recall.

Step 103, judging whether to perform an operation of power supply switching if it is recognized that the quick switching device has been activated in the target mode.

After the quick switching device is activated in the target mode, the quick switching device will start to judge whether the circuit-closing condition of the backup power supply is satisfied, and if the judgment result is Yes, the backup power supply will be triggered to perform the circuit-closing operation. The circuit-closing condition of the backup power supply belongs to prior art, such as fast switching, synchronous capture switching, residual voltage switching, etc., all of which correspond to specific circuit-closing conditions of the backup power supply, and will not be elaborated herein.

According to the present embodiment, users can set the target mode for determining the condition for switching between two power supplies by themselves, so that the users can realize personalized settings to satisfy their needs.

EMBODIMENT 2

This embodiment provides a further supplementary description of the method for switching a power supply with the quick switching device of embodiment 1.

Figure 2 is a schematic flowchart of a method for switching a power supply with a quick switching device according to this embodiment. The method comprises^ Step 201, receiving a target mode, wherein the target mode is used to trigger the quick switching device to start the operation of judging whether to perform power supply switching, and the target mode is determined according to a real-time working condition of the power distribution system.

After determining the desired target mode, users enter the target mode through an editing interface, and the target mode is then sent to the quick switching device through a preset port on the quick switching device. The editing interface herein may be presented by software corresponding to the quick switching device. The preset port here may be

In addition, users may set a plurality of target modes and send all of the plurality of target modes to the quick switching device.

Step 202, storing the target mode.

For example, the one or more target modes are stored with other activation modes. The other activation modes are manual activation, fault activation and self-test activation. The preset activation mode is factory preset in the quick switching device.

Step 203, judging whether to perform an operation of power supply switching if it is recognized that the quick switching device has been activated in one activation mode, and performing step 204 if the judgment result is Yes.

The activation mode may be one of the preset activation modes or a target mode. After the quick switching device is activated, it starts to judge whether to execute the operation of power supply switching, i.e., to judge whether to switch on the backup power supply.

Step 204, triggering the switching between two power supplies.

In the case where the quick switching device judges that the condition for switching on the backup power supply is satisfied, it will trigger the switching on of the backup power supply, thereby realizing the switching between the two power supplies.

In the present embodiment, users can set the target mode for determining the conditions for switching between two power supplies by themselves, so that users can realize personalized settings to satisfy their needs.

EMBODIMENT 3

The present embodiment provides a quick switching device that is located in a power distribution system which further comprises at least two power supplies, with one power supply that is currently supplying power used as a working power supply, and the remaining power supply used as a backup power supply, wherein the quick switching device is used to trigger the switching between the working power supply and the backup power supply when it is confirmed that the power distribution system satisfies the conditions.

Figure 3 is a schematic structural diagram of a quick switching device according to the present embodiment. The quick switching device comprises a receiving unit 301, a storage unit 302, an identification unit 303, and a judgment unit 304.

Herein, the receiving unit 301 is used to receive a target mode that is used to trigger the quick switching device to start the operation of judging whether to perform power supply switching, and the target mode is determined according to the real-time working conditions of the power distribution system! the storage unit 302 is used to store the target mode! the identification unit 303 is used to identify whether the quick switching device is activated in the target mode, and if the identification result is Yes, the judgment unit 304 will be triggered! the judgment unit 304 is used to determine whether to perform an operation of power supply switching.

Optionally, the identification unit 303 is also used to identify whether the quick switching device is activated in a preset activation mode, and the preset activation mode is: manual activation, fault activation, random-tripping activation or self-test activation! if the identification result is Yes, the judgment unit 304 will be triggered. Optionally, the conditions of the switching corresponding to the target mode comprise at least one of the following conditions: the input current of said working power supply is 0; the working power supply has a negative sequence quantity exceeding the allowable range; the working power supply has a zero sequence quantity exceeding the allowable range; the working power supply has a frequency change rate exceeding the allowable range; the working power supply has a voltage change rate exceeding the allowable range; and the working power supply has a reverse power.

Optionally, the receiving unit 301 is used to: receive, via a preset port, the target mode input by a user through an editing interface.

The methods of operations of these units in this embodiment are the same as those in the embodiments described above, so they are not described again here.

According to the present embodiment, users can set the target mode for determining the condition for switching between two power supplies by the quick switching device itself, so that the users can set the mode according to the actual working condition of the power distribution network, which satisfies the users’ needs.

The present invention also provides a quick switching device comprising at least one memory and at least one processor. The memory is used to store instructions. The processor is used to execute the method of switching a power supply with a quick switching device according to any of the preceding embodiments based on the instructions stored in the memory.

An embodiment of the present invention further provides a readable storage medium. The readable storage medium has machine-readable instructions stored therein, and when the machine-readable instructions are executed by a machine, the machine will execute the method for switching a power supply with a quick switching device according to any of the preceding embodiments.

The readable medium stores a machine-readable instruction that, when executed by a processor, causes the processor to execute any one of the above-described methods. Specifically, a system or device equipped with a readable storage medium may be provided; software program code realizing the function of any one of the embodiments above is stored on the readable storage medium, and a computer or processor of the system or device is caused to read and execute a machine-readable instruction stored in the readable storage medium.

In this case, the function of any one of the above embodiments may be performed by a program code read from the readable medium, so a machine-readable code and a readable storage medium for storing the machine-readable code constitute a part of the present invention.

Examples of readable storage media include floppy disks, hard disks, magnetooptical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD- RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards and ROM. Optionally, the program code may be downloaded from a server computer or a cloud via a communication network.

Those skilled in the art should understand that various changes in form and modifications may be made to the embodiments disclosed above without departing from the substance of the invention. Thus, the scope of protection of the present invention shall be defined by the appended claims.

It should be noted that not all steps and units in the above-described process flows and system structure diagrams are necessary, and some steps or units may be omitted according to actual needs. The sequence in which the steps are executed is not fixed, but may be adjusted as needed. The device structure described in the above embodiments may be either a physical structure or a logical structure, which means that some units may be implemented by the same physical entity, or some units may be implemented by a plurality of physical entities separately or by some parts of a plurality of independent devices jointly.

In the embodiments above, a hardware unit may be realized in a mechanical or an electrical manner. For example, a hardware unit or processor may comprise a permanently dedicated circuit or logic (for example, a specialized processor, FPGA, or ASIC) to complete corresponding operations. A hardware unit or processor may further comprise programmable logic or circuits (such as general- purpose processors or other programmable processors), which may be temporarily set by software to complete corresponding operations. Particular embodiments (mechanical, or dedicated permanent circuitry, or temporarily set circuitry) may be determined based on considerations of cost and time.

The embodiments above are merely preferred embodiments of the present invention, which are not intended to limit it. Any modifications, equivalent substitutions or improvements etc. made within the spirit and principles of the present invention shall be included in the scope of protection thereof.