CN110912255B - Power supply switching method and power supply switching system - Google Patents
Power supply switching method and power supply switching system Download PDFInfo
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- CN110912255B CN110912255B CN201911316462.3A CN201911316462A CN110912255B CN 110912255 B CN110912255 B CN 110912255B CN 201911316462 A CN201911316462 A CN 201911316462A CN 110912255 B CN110912255 B CN 110912255B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The application discloses a power supply switching method and a power supply switching system, the method firstly determines the state information of an intermediate power supply according to the state information of a main power supply and the state information of a power supply to be switched, then provides the intermediate power supply for a load when a multi-power supply switching device switches the main power supply to the power supply to be switched, acquires the current state information of the power supply to be switched, adjusts the state information of the intermediate power supply to the current state information of the power supply to be switched, finally utilizes the power supply to be switched to supply power to the load when the adjusted state information of the intermediate power supply meets the switching condition, a dynamic voltage restorer quits compensation to complete the power supply switching, and in the process, because the phase and the frequency of the intermediate power supply are between the main power supply and the power supply to be switched, the phase and the frequency change degree of the power supply provided for the load can be reduced when the power supply is switched, the problem that when the dynamic voltage restorer exits compensation, the load is shut down due to overlarge difference of the main power supply and the standby power supply is solved.
Description
Technical Field
The present disclosure relates to the field of power supply devices, and more particularly, to a power switching method and a power switching system.
Background
The application places of the power supply switching system are very wide, and most places with higher power supply stability, such as hospitals, markets, laboratories, cells and the like, are provided with the power supply switching system so as to be quickly switched to a standby power supply for supplying power when a main power supply fails.
Because the power switching system needs a long time to switch the main power and the standby power, when the power switching system is applied to power sensitive loads, a Dynamic Voltage Restorer (DVR) is usually added at the front end of the load, and the seamless switching of the dual power is protected by the combination of the power switching system with the main power and the standby power and the Dynamic voltage restorer.
However, in the practical application process, it is found that since the requirement of the power switching system for the main and standby power supplies is a same source power supply, and the main and standby power supplies for actual power supply are usually different sources of commercial power, it is difficult to meet the requirement that the same source power supply is used as the main and standby power supplies at the same time, which causes the combination of the power switching system and the dynamic voltage restorer to still cause the load to be shut down due to the overlarge difference between the main and standby power supplies when the dynamic voltage restorer exits from compensation.
Disclosure of Invention
In order to solve the technical problem, the application provides a power supply switching method and a power supply switching system, so as to reduce the degree of change of the phase and the frequency of a power supply provided for a load when a main power supply and a power supply to be switched are switched, and solve the problem that the load is shut down due to overlarge difference between a main power supply and a standby power supply when a dynamic voltage restorer exits compensation.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a power supply switching method is applied to a power supply switching system composed of multiple power supply switching devices and a dynamic voltage restorer, and comprises the following steps:
acquiring main power supply state information and to-be-switched power supply state information of multi-power supply switching equipment, wherein the main power supply state information comprises phase and frequency information of a main power supply, and the to-be-switched power supply state information comprises phase and frequency information of the to-be-switched power supply;
determining state information of an intermediate state power supply according to the state information of the main power supply and the state information of the power supply to be switched, wherein the state information of the intermediate state power supply comprises the phase and the frequency of the intermediate state power supply, the phase of the intermediate state power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate state power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
judging whether the multi-power supply switching equipment switches a main power supply into a power supply to be switched for supplying power, if so, providing the intermediate power supply for a load, acquiring the current state information of the power supply to be switched, adjusting the state information of the intermediate power supply to the current state information of the power supply to be switched, and supplying power to the load by using the power supply to be switched when the adjusted state information of the intermediate power supply meets the switching condition;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
Optionally, the power switching system further includes: a power grid separator connected between the multi-power switching device and the dynamic voltage restorer;
the judging whether the multi-power supply switching equipment switches the main power supply into the power supply to be switched includes:
when the main power supply of the multi-power supply switching equipment is abnormal and the power grid separator cuts off the connection between the main power supply and the load, the multi-power supply switching equipment is judged to switch the main power supply to be switched.
Optionally, the providing the intermediate-state power supply to the load includes:
and providing an initial power supply consistent with the main power supply state information to the load, and adjusting the phase and the frequency of the initial power supply to the phase and the frequency of the intermediate power supply until the phase and the frequency of the initial power supply are consistent with the phase and the frequency of the intermediate power supply.
Optionally, when the state information of the adjusted intermediate power supply meets a switching condition, the supplying power to the load by using the power supply to be switched includes:
and when the difference value between the frequency of the intermediate power supply and the current frequency of the power supply to be switched is smaller than a first preset threshold value, and the difference value between the phase of the intermediate power supply and the current phase of the power supply to be switched is smaller than a second preset threshold value, the power supply to be switched is utilized to supply power for the load.
Optionally, when the multi-power switching device is a dual-power switching device, the power to be switched is a standby power in the dual-power switching device;
when the multi-power supply switching equipment comprises a plurality of paths of standby power supplies, the power supply to be switched is one path of standby power supply randomly determined from the plurality of paths of standby power supplies or one path of standby power supply with the minimum phase and frequency difference value with the main power supply.
Optionally, the determining the state information of the intermediate power supply according to the main power supply state information and the state information of the power supply to be switched includes:
taking the average value of the frequency of the main power supply and the frequency of the power supply to be switched as the frequency of the intermediate power supply;
and taking the average value of the phase of the main power supply and the phase of the power supply to be switched as the phase of the intermediate power supply.
A power switching system, comprising: a multi-power switching device and a dynamic voltage restorer.
The dynamic voltage restorer is used for acquiring main power supply state information of the multi-power supply switching equipment and state information of a power supply to be switched, the main power supply state information comprises phase and frequency information of a main power supply, and the state information of the power supply to be switched comprises the phase and frequency information of the power supply to be switched;
determining state information of an intermediate state power supply according to the state information of the main power supply and the state information of the power supply to be switched, wherein the state information of the intermediate state power supply comprises the phase and the frequency of the intermediate state power supply, the phase of the intermediate state power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate state power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
judging whether the multi-power supply switching equipment switches a main power supply into a power supply to be switched for supplying power, if so, providing the intermediate power supply for a load, acquiring the current state information of the power supply to be switched, adjusting the state information of the intermediate power supply to the current state information of the power supply to be switched, and supplying power to the load by using the power supply to be switched when the adjusted state information of the intermediate power supply meets the switching condition;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
Optionally, the power switching system further includes: a power grid separator connected between the multi-power switching device and the dynamic voltage restorer;
the dynamic voltage restorer judges whether the multi-power supply switching equipment switches a main power supply to a power supply to be switched, and particularly judges that the multi-power supply switching equipment switches the main power supply to the power supply to be switched when the main power supply of the multi-power supply switching equipment is abnormal and the power grid separator cuts off the connection between the main power supply and the load.
Optionally, the dynamic voltage restorer is configured to provide the intermediate-state power supply to the load, and is specifically configured to provide an initial power supply consistent with the main power supply state information to the load, and adjust the phase and frequency of the initial power supply to the phase and frequency of the intermediate-state power supply until the phase and frequency of the initial power supply are consistent with the phase and frequency of the intermediate-state power supply.
Optionally, the power switching system further includes: a state adjustment device;
and the state adjusting equipment is used for adjusting the state information of the power supply to be switched and then transmitting the adjusted state information as a new power supply to be switched to the dynamic voltage restorer when the multi-power supply switching equipment switches the main power supply to the power supply to be switched.
It can be seen from the above technical solutions that the present application provides a power switching method and a power switching system, where the power switching method first obtains state information of a main power source and state information of a power source to be switched, determines state information of an intermediate power source according to the state information of the main power source and the state information of the power source to be switched, then provides the intermediate power source to a load when the multi-power-source switching device switches the main power source to the power source to be switched, obtains current state information of the power source to be switched, adjusts the state information of the intermediate power source to the current state information of the power source to be switched, and finally supplies power to the load by using the power source to be switched when the adjusted state information of the intermediate power source meets a switching condition, and the dynamic voltage restorer quits compensation to complete switching of the main power source to the power source to be switched, in the process, because the phase and the frequency of the intermediate power supply are both between the phase and the frequency of the main power supply and the power supply to be switched, the change degree of the phase and the frequency of the power supply provided for the load when the main power supply and the power supply to be switched are switched can be reduced, and the problem that the load is stopped due to overlarge difference between the main power supply and the standby power supply when the dynamic voltage restorer quits compensation is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a dual power switching device in the prior art;
fig. 2 is a schematic structural diagram of a power switching system according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a power switching method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a power switching system according to another embodiment of the present application;
fig. 5 is a schematic flowchart of a power switching method according to another embodiment of the present application;
fig. 6 is a schematic flowchart of a power switching method according to another embodiment of the present application.
Detailed Description
Referring to fig. 1, fig. 1 shows a schematic circuit structure diagram of a dual power supply switching device, in fig. 1, L1, L2 and L3 are respectively used for accessing three-phase power supplies of a power supply a and a power supply B, the power supply a and the power supply B are respectively a main power supply and a standby power supply, reference numeral FU denotes a fuse, KM1 and KM2 denote auxiliary contacts of a contactor, KT1, KT2 and KT1-1 denote different control coils of the contactor, and HK denotes a main contact of the contactor, and specific connection relationships thereof refer to fig. 1. The dual-power switching equipment integrates switch and logic control into a whole, does not need an additional controller, really realizes an automatic transfer switch with electromechanical integration, has the functions of voltage detection, frequency detection, communication interface, electrical and mechanical interlocking and the like, and can realize automatic, electric remote and emergency manual control. The operation is that the logic control board manages the operation of the motor and the gear box by various logic commands to realize the acceleration mechanism that the motor drives the switch spring to store energy and instantly release, and quickly switch on or off the circuit or carry out circuit conversion.
However, since the switching time of the main power supply and the standby power supply of the dual power supply switching device is too long, a dynamic voltage restorer is usually added at the front end of a load during sensitive load protection, and the seamless switching of the dual power supplies is ensured in the form of the dual power supply switching device and the dynamic voltage restorer.
However, as described in the background art, the conventional voltage tracking technology of the dynamic voltage restorer cannot meet the requirements of simultaneous tracking of multiple power sources and phase angle adjustment during switching of the multiple power sources, and finally, the phase angle difference value of two power sources is too large, switching of the two power sources is completed, and when the dynamic voltage restorer exits from compensation, the load still stops due to abnormal voltage, and it is not guaranteed that a sensitive load under mutually backup non-homologous dual power sources can successfully pass through the intermediate state of dual power source switching. So that the technical combination of the dual power supply and the dynamic voltage restorer has no real practical application.
In view of this, an embodiment of the present application provides a power switching method, which is applied to a power switching system including multiple power switching devices and a dynamic voltage restorer, and the power switching method includes:
acquiring main power supply state information and to-be-switched power supply state information of multi-power supply switching equipment, wherein the main power supply state information comprises phase and frequency information of a main power supply, and the to-be-switched power supply state information comprises phase and frequency information of the to-be-switched power supply;
determining state information of an intermediate state power supply according to the state information of the main power supply and the state information of the power supply to be switched, wherein the state information of the intermediate state power supply comprises the phase and the frequency of the intermediate state power supply, the phase of the intermediate state power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate state power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
judging whether the multi-power supply switching equipment switches a main power supply into a power supply to be switched for supplying power, if so, providing the intermediate power supply for a load, acquiring the current state information of the power supply to be switched, adjusting the state information of the intermediate power supply to the current state information of the power supply to be switched, and supplying power to the load by using the power supply to be switched when the adjusted state information of the intermediate power supply meets the switching condition;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
The power supply switching method comprises the steps of firstly obtaining state information of a main power supply and state information of a power supply to be switched, determining state information of an intermediate power supply according to the state information of the main power supply and the state information of the power supply to be switched, then providing the intermediate power supply for a load when the multi-power supply switching equipment switches the main power supply to the power supply to be switched, obtaining current state information of the power supply to be switched, adjusting the state information of the intermediate power supply to the current state information of the power supply to be switched, and finally supplying power to the load by using the power supply to be switched when the adjusted state information of the intermediate power supply meets a switching condition, wherein the dynamic voltage restorer quits compensation to complete the switching from the main power supply to the power supply to be switched, and in the process, as the phase and the frequency of the intermediate power supply are both between the phase and the frequency of the main power supply to be switched, the change degree of the phase and the frequency of the power supply provided for the load when the main power supply and the power supply to be switched are switched can be reduced, and the problem that the load is shut down due to overlarge difference between the main power supply and the standby power supply when the dynamic voltage restorer exits compensation is solved.
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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the present application provides a power switching method, which is applied to a power switching system including multiple power switching devices and a dynamic voltage restorer as shown in fig. 2, and as shown in fig. 3, the power switching method includes:
s101: acquiring main power supply state information and to-be-switched power supply state information of multi-power supply switching equipment, wherein the main power supply state information comprises phase and frequency information of a main power supply, and the to-be-switched power supply state information comprises phase and frequency information of the to-be-switched power supply;
s102: determining state information of an intermediate state power supply according to the state information of the main power supply and the state information of the power supply to be switched, wherein the state information of the intermediate state power supply comprises the phase and the frequency of the intermediate state power supply, the phase of the intermediate state power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate state power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
s103: judging whether the multi-power supply switching equipment switches a main power supply into a power supply to be switched for supplying power, if so, providing the intermediate power supply for a load, acquiring the current state information of the power supply to be switched, adjusting the state information of the intermediate power supply to the current state information of the power supply to be switched, and supplying power to the load by using the power supply to be switched when the adjusted state information of the intermediate power supply meets the switching condition;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
In fig. 2, 10 denotes the multi power supply switching device, and 20 denotes the dynamic voltage restorer.
In this embodiment, the power switching method first obtains the state information of a main power source and the state information of a power source to be switched, determines the state information of an intermediate power source according to the state information of the main power source and the state information of the power source to be switched, then provides the intermediate power source to a load when the multi-power source switching device switches the main power source to the power source to be switched to supply power, obtains the current state information of the power source to be switched, adjusts the state information of the intermediate power source to the current state information of the power source to be switched, and finally supplies power to the load by using the power source to be switched when the adjusted state information of the intermediate power source meets the switching condition, the dynamic voltage restorer quits compensation, and completes the switching from the main power source to the power source to be switched, in this process, because the phase and the frequency of the intermediate power source are both between the phase and the frequency of the main power source and the power source to be switched, the change degree of the phase and the frequency of the power supply provided for the load when the main power supply and the power supply to be switched are switched can be reduced, and the problem that the load is shut down due to overlarge difference between the main power supply and the standby power supply when the dynamic voltage restorer exits compensation is solved.
On the basis of the above embodiments, in an embodiment of the present application, as shown in fig. 4, the power switching system further includes: a grid separator 30 connecting between the multi-power switching device and the dynamic voltage restorer;
as shown in fig. 5, the power switching method includes:
s201: acquiring main power supply state information and to-be-switched power supply state information of multi-power supply switching equipment, wherein the main power supply state information comprises phase and frequency information of a main power supply, and the to-be-switched power supply state information comprises phase and frequency information of the to-be-switched power supply;
s202: determining state information of an intermediate state power supply according to the state information of the main power supply and the state information of the power supply to be switched, wherein the state information of the intermediate state power supply comprises the phase and the frequency of the intermediate state power supply, the phase of the intermediate state power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate state power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
s203: when a main power supply of the multi-power supply switching equipment is abnormal and the power grid separator cuts off the connection between the main power supply and the load, judging that the multi-power supply switching equipment switches the main power supply to be switched to supply power to the power supply to be switched, providing an initial power supply consistent with main power supply state information for the load, and adjusting the phase and frequency of the initial power supply to the phase and frequency of the intermediate power supply until the phase and frequency of the initial power supply are consistent with those of the intermediate power supply;
s204: acquiring the current state information of the power supply to be switched, adjusting the state information of the intermediate state power supply to the current state information of the power supply to be switched, and supplying power to the load by using the power supply to be switched when the adjusted state information of the intermediate state power supply meets the switching condition;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
In the embodiment, a feasible method for judging whether the multi-power supply switching device switches the main power supply to the power supply to be switched or not and a feasible method for providing the intermediate-state power supply to the load are provided. Specifically, in this embodiment, a grid splitter is further included between the multi-power switching device and the dynamic voltage restorer, and when the main power supply is abnormal, a thyristor built in the grid splitter is turned off in a reverse direction to cut off the connection between the load and the main power supply, the load is switched to be supplied with power by the dynamic load restorer within 5ms, and at this time, the dynamic load restorer supplies an initial power supply to the load in accordance with the main power supply state information (i.e., the phase and frequency of the initial power supply at this time are in accordance with the main power supply state information), and adjusts the phase and frequency of the initial power supply to the phase and frequency of the intermediate power supply within a certain time (about two cycles), and at the same time, the multi-power switching device is switched from the main power supply to the power supply to be switched completely within 200 ms.
After the multi-power switching device completes the switching of the power to be switched, the dynamic voltage restorer starts to execute step S204 to perform dynamic switching from the intermediate power to the power to be switched.
On the basis of the foregoing embodiment, in an optional embodiment of the present application, as shown in fig. 6, the power supply switching method includes:
s301: acquiring main power supply state information and to-be-switched power supply state information of multi-power supply switching equipment, wherein the main power supply state information comprises phase and frequency information of a main power supply, and the to-be-switched power supply state information comprises phase and frequency information of the to-be-switched power supply;
s302: determining state information of an intermediate state power supply according to the state information of the main power supply and the state information of the power supply to be switched, wherein the state information of the intermediate state power supply comprises the phase and the frequency of the intermediate state power supply, the phase of the intermediate state power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate state power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
s303: when a main power supply of the multi-power supply switching equipment is abnormal and the power grid separator cuts off the connection between the main power supply and the load, judging that the multi-power supply switching equipment switches the main power supply to be switched to supply power to the power supply to be switched, providing an initial power supply consistent with main power supply state information for the load, and adjusting the phase and frequency of the initial power supply to the phase and frequency of the intermediate power supply until the phase and frequency of the initial power supply are consistent with those of the intermediate power supply;
s304: acquiring current state information of the power supply to be switched, adjusting the state information of the intermediate power supply to the current state information of the power supply to be switched, and supplying power to the load by using the power supply to be switched when the difference value between the frequency of the intermediate power supply and the current frequency of the power supply to be switched is smaller than a first preset threshold value and the difference value between the phase of the intermediate power supply and the current phase of the power supply to be switched is smaller than a second preset threshold value;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
In this embodiment, a method for determining whether the state information of the adjusted intermediate power supply meets a switching condition is provided, that is, when a difference between the frequency of the intermediate power supply and the current frequency of the power supply to be switched is smaller than a first preset threshold, and a difference between the phase of the intermediate power supply and the current phase of the power supply to be switched is smaller than a second preset threshold, the state information of the adjusted intermediate power supply is considered to meet the switching condition, and the intermediate power supply can be switched to the power supply to be switched, that is, the dynamic voltage restorer completes compensation, and exits the switching process.
Optionally, when the multi-power switching device is a dual-power switching device, the power to be switched is a standby power in the dual-power switching device;
when the multi-power supply switching equipment comprises a plurality of paths of standby power supplies, the power supply to be switched is one path of standby power supply randomly determined from the plurality of paths of standby power supplies or one path of standby power supply with the minimum phase and frequency difference value with the main power supply.
In this embodiment, in the multiple backup power sources, the one backup power source with the smallest phase and frequency difference value with respect to the main power source may be the backup power source with the smallest phase difference value and the smallest frequency difference value, or may be the backup power source with the smallest sum of the phase difference value and the frequency difference value, and when the sums of the phase difference value and the frequency difference value of the two or more backup power sources and the main power source are equal, one backup power source is randomly selected from the backup power sources with the same sum of the phase difference value and the frequency difference value as the power source to be switched.
Optionally, the determining the state information of the intermediate power supply according to the main power supply state information and the state information of the power supply to be switched includes:
taking the average value of the frequency of the main power supply and the frequency of the power supply to be switched as the frequency of the intermediate power supply;
and taking the average value of the phase of the main power supply and the phase of the power supply to be switched as the phase of the intermediate power supply.
In this embodiment, the average value of the frequency of the main power supply and the frequency of the power supply to be switched may be an average value of an instantaneous frequency of the main power supply and an instantaneous frequency of the power supply to be switched, or an average value of an average frequency of the main power supply over a period of time and an instantaneous frequency of the power supply to be switched over a period of time;
correspondingly, the average value of the phase of the main power supply and the phase of the power supply to be switched can be the average value of the instantaneous phase of the main power supply and the instantaneous phase of the power supply to be switched, or the average phase of the main power supply in a period of time and the instantaneous phase of the power supply to be switched in a period of time.
The following describes a power switching system provided in an embodiment of the present application, and the power switching system described below may be referred to in correspondence with the power switching method described above.
Correspondingly, an embodiment of the present application further provides a power switching system, with reference to fig. 2, including: a multi-power switching device 10 and a dynamic voltage restorer 20.
The dynamic voltage restorer 20 is configured to obtain main power source state information and to-be-switched power source state information of the multi-power source switching device 10, where the main power source state information includes phase and frequency information of a main power source, and the to-be-switched power source state information includes phase and frequency information of the to-be-switched power source;
determining state information of an intermediate state power supply according to the state information of the main power supply and the state information of the power supply to be switched, wherein the state information of the intermediate state power supply comprises the phase and the frequency of the intermediate state power supply, the phase of the intermediate state power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate state power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
judging whether the multi-power supply switching equipment 10 switches a main power supply into a power supply to be switched for supplying power, if so, providing the intermediate power supply for a load, acquiring the current state information of the power supply to be switched, adjusting the state information of the intermediate power supply to the current state information of the power supply to be switched, and supplying power to the load by using the power supply to be switched when the adjusted state information of the intermediate power supply meets the switching condition;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
Optionally, the power switching system further includes: a grid separator connected between the multi-power switching device 10 and the dynamic voltage restorer 20;
the dynamic voltage restorer 20 determines whether the multi-power switching device 10 switches the main power supply to the power supply to be switched, and specifically determines that the multi-power switching device 10 switches the main power supply to the power supply to be switched when the main power supply of the multi-power switching device 10 is abnormal and the power grid separator cuts off the connection between the main power supply and the load.
Optionally, the dynamic voltage restorer 20 is configured to provide the intermediate state power supply to the load, and is specifically configured to provide the initial power supply to the load, where the initial power supply is consistent with the main power supply state information, and adjust the phase and frequency of the initial power supply to the phase and frequency of the intermediate state power supply until the phase and frequency of the initial power supply are consistent with the phase and frequency of the intermediate state power supply.
Optionally, the power switching system further includes: a state adjustment device;
the state adjusting device is configured to, when the multi-power switching device 10 switches a main power supply to a power supply to be switched, adjust state information of the power supply to be switched, and transmit the adjusted state information as a new power supply to be switched to the dynamic voltage restorer 20.
Optionally, the state adjustment device may be a transformer, a rectifier, or other devices capable of adjusting parameters such as a phase and a frequency of the power source to be switched.
In summary, the embodiment of the present application provides a power switching method and a power switching system, wherein the power switching method first obtains status information of a main power source and status information of a power source to be switched, determines status information of an intermediate power source according to the status information of the main power source and the status information of the power source to be switched, then provides the intermediate power source to a load when the multi-power-source switching device switches the main power source to the power source to be switched, obtains current status information of the power source to be switched, adjusts the status information of the intermediate power source to the current status information of the power source to be switched, and finally supplies power to the load by using the power source to be switched when the adjusted status information of the intermediate power source meets a switching condition, the dynamic voltage restorer quits compensation, and completes switching of the main power source to the power source to be switched, in the process, because the phase and the frequency of the intermediate power supply are both between the phase and the frequency of the main power supply and the power supply to be switched, the change degree of the phase and the frequency of the power supply provided for the load when the main power supply and the power supply to be switched are switched can be reduced, and the problem that the load is stopped due to overlarge difference between the main power supply and the standby power supply when the dynamic voltage restorer quits compensation is solved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power supply switching method is applied to a power supply switching system which comprises a plurality of power supply switching devices and a dynamic voltage restorer, and comprises the following steps:
the method comprises the steps that a dynamic voltage restorer obtains main power supply state information and to-be-switched power supply state information of multi-power supply switching equipment, wherein the main power supply state information comprises phase and frequency information of a main power supply, and the to-be-switched power supply state information comprises the phase and frequency information of the to-be-switched power supply;
the dynamic voltage restorer determines the state information of the intermediate power supply according to the state information of the main power supply and the state information of the power supply to be switched, the state information of the intermediate power supply comprises the phase and the frequency of the intermediate power supply, the phase of the intermediate power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
the dynamic voltage restorer judges whether the multi-power supply switching equipment switches a main power supply into a power supply to be switched for supplying power, if so, the dynamic voltage restorer provides the intermediate power supply for a load, acquires the current state information of the power supply to be switched, adjusts the state information of the intermediate power supply to the current state information of the power supply to be switched, and supplies power to the load by using the power supply to be switched when the adjusted state information of the intermediate power supply meets the switching condition;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
2. The power supply switching method according to claim 1, wherein the power supply switching system further comprises: a power grid separator connected between the multi-power switching device and the dynamic voltage restorer;
the dynamic voltage restorer judges whether the multi-power supply switching equipment switches the main power supply into the power supply to be switched or not, and the dynamic voltage restorer comprises:
and when the main power supply of the multi-power supply switching equipment is abnormal and the power grid separator cuts off the connection between the main power supply and the load, the dynamic voltage restorer judges that the multi-power supply switching equipment switches the main power supply to the power supply to be switched.
3. The power switching method of claim 1, wherein the providing the intermediate state power to the load comprises:
and providing an initial power supply consistent with the main power supply state information to the load, and adjusting the phase and the frequency of the initial power supply to the phase and the frequency of the intermediate power supply until the phase and the frequency of the initial power supply are consistent with the phase and the frequency of the intermediate power supply.
4. The power switching method according to claim 1, wherein when the state information of the adjusted intermediate power supply satisfies a switching condition, the supplying power to the load by using the power supply to be switched comprises:
and when the difference value between the frequency of the intermediate power supply and the current frequency of the power supply to be switched is smaller than a first preset threshold value, and the difference value between the phase of the intermediate power supply and the current phase of the power supply to be switched is smaller than a second preset threshold value, the power supply to be switched is utilized to supply power for the load.
5. The power switching method according to claim 1, wherein when the multi-power switching device is a dual power switching device, the power to be switched is a standby power in the dual power switching device;
when the multi-power supply switching equipment comprises a plurality of paths of standby power supplies, the power supply to be switched is one path of standby power supply randomly determined from the plurality of paths of standby power supplies or one path of standby power supply with the minimum phase and frequency difference value with the main power supply.
6. The power switching method according to claim 1, wherein the determining, by the dynamic voltage restorer, the status information of the intermediate-state power supply according to the main power supply status information and the status information of the power supply to be switched comprises:
the dynamic voltage restorer takes the average value of the frequency of the main power supply and the frequency of the power supply to be switched as the frequency of the intermediate state power supply;
and the dynamic voltage restorer takes the average value of the phase of the main power supply and the phase of the power supply to be switched as the phase of the intermediate power supply.
7. A power switching system, comprising: a multi-power switching device and a dynamic voltage restorer, wherein,
the dynamic voltage restorer is used for acquiring main power supply state information of the multi-power supply switching equipment and state information of a power supply to be switched, the main power supply state information comprises phase and frequency information of a main power supply, and the state information of the power supply to be switched comprises the phase and frequency information of the power supply to be switched;
determining state information of an intermediate state power supply according to the state information of the main power supply and the state information of the power supply to be switched, wherein the state information of the intermediate state power supply comprises the phase and the frequency of the intermediate state power supply, the phase of the intermediate state power supply is between the phase of the main power supply and the phase of the power supply to be switched, and the frequency of the intermediate state power supply is between the frequency of the main power supply and the frequency of the power supply to be switched;
judging whether the multi-power supply switching equipment switches a main power supply into a power supply to be switched for supplying power, if so, providing the intermediate power supply for a load, acquiring the current state information of the power supply to be switched, adjusting the state information of the intermediate power supply to the current state information of the power supply to be switched, and supplying power to the load by using the power supply to be switched when the adjusted state information of the intermediate power supply meets the switching condition;
the current state information of the power supply to be switched comprises the current frequency and the current phase of the power supply to be switched.
8. The power switching system of claim 7, further comprising: a power grid separator connected between the multi-power switching device and the dynamic voltage restorer;
the dynamic voltage restorer judges whether the multi-power supply switching equipment switches a main power supply to a power supply to be switched, and particularly judges that the multi-power supply switching equipment switches the main power supply to the power supply to be switched when the main power supply of the multi-power supply switching equipment is abnormal and the power grid separator cuts off the connection between the main power supply and the load.
9. The power switching system of claim 7, wherein the dynamic voltage restorer is configured to provide the intermediate state power to a load, and to provide an initial power to the load consistent with the main power state information and to adjust the phase and frequency of the initial power to the phase and frequency of the intermediate state power until the phase and frequency of the initial power is consistent with the phase and frequency of the intermediate state power.
10. The power switching system of claim 7, further comprising: a state adjustment device;
and the state adjusting equipment is used for adjusting the state information of the power supply to be switched and then transmitting the adjusted state information as a new power supply to be switched to the dynamic voltage restorer when the multi-power supply switching equipment switches the main power supply to the power supply to be switched.
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