CN113785467B - Bus voltage control method and system of uninterruptible power supply system and related components - Google Patents
Bus voltage control method and system of uninterruptible power supply system and related components Download PDFInfo
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- CN113785467B CN113785467B CN202180001976.9A CN202180001976A CN113785467B CN 113785467 B CN113785467 B CN 113785467B CN 202180001976 A CN202180001976 A CN 202180001976A CN 113785467 B CN113785467 B CN 113785467B
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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
- H02J9/062—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 AC powered loads
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The application discloses a bus voltage control method, a system and related components of an uninterruptible power supply system, which comprise the following steps: detecting the input voltage of the main circuit; determining a current bus voltage target value based on the main circuit input voltage; controlling the bus voltage target value of each parallel uninterrupted power supply in the uninterrupted power supply system to be the currently determined bus voltage target value; the uninterrupted power system at least comprises 2 uninterrupted power supplies connected in parallel. By the scheme, good dynamic response and overall efficiency can be guaranteed, and the situation that the direct-current bus voltage rises under uncontrolled conditions can be avoided.
Description
Technical Field
The invention relates to the technical field of alternating current power supplies, in particular to a bus voltage control method and system of an uninterruptible power supply system and related components.
Background
In a medium and high power online ups system, the main circuit typically includes a bypass/rectifier/inverter. The rectifier may rectify an ac commercial power voltage into a dc bus voltage, and the inverter may convert the dc bus voltage into an ac voltage to output the ac voltage to the load.
Generally, the control target value of the dc bus voltage is selected in advance according to the requirement specification, and is generally set to be higher than the voltage peak value of the ac input, and also considers factors such as bus capacitance cost, dynamic response and efficiency.
However, if the bus voltage target value is fixed, good dynamic response and efficiency index may not be achieved. Therefore, in the existing scheme, the target value of the bus voltage is set to dynamically change according to the load, generally, the bus voltage is higher when the load is empty, and the bus voltage is lower when the load is full, so that both the dynamic response and the overall efficiency are taken into consideration. However, in practical applications, the dc bus voltage is often not controlled by the rectifier and rises, which may cause overvoltage protection and even device damage.
In summary, how to avoid the situation that the dc bus voltage is not controlled while considering both the dynamic response and the overall efficiency is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a bus voltage control method, a bus voltage control system and related components of an uninterruptible power supply system, so as to avoid the situation that the direct-current bus voltage is not controlled when dynamic response and the efficiency of the whole machine are considered.
In order to solve the technical problems, the invention provides the following technical scheme:
a bus voltage control method of an uninterruptible power supply system comprises the following steps:
detecting the input voltage of the main circuit;
determining a current bus voltage target value based on the main circuit input voltage;
controlling the bus voltage target value of each parallel uninterrupted power supply in the uninterrupted power supply system to be the currently determined bus voltage target value;
the uninterrupted power system at least comprises 2 uninterrupted power supplies connected in parallel.
Preferably, the method further comprises the following steps:
judging whether at least one uninterrupted power supply is in a bypass switching preparation state;
if yes, detecting the bypass input voltage;
correspondingly, the determining a current bus voltage target value based on the main circuit input voltage includes:
and determining a current bus voltage target value based on the main circuit input voltage and the bypass input voltage.
Preferably, the determining a current bus voltage target value based on the main circuit input voltage and the bypass input voltage includes:
determining a first bus voltage target value corresponding to the input voltage of the main circuit according to a preset first corresponding relation;
determining a second bus voltage target value corresponding to the bypass input voltage according to a preset second corresponding relation;
taking the maximum value of the first bus voltage target value and the second bus voltage target value as the determined current bus voltage target value;
wherein in the first correspondence the main circuit input voltage is positively correlated with the first bus voltage target value, and in the second correspondence the bypass input voltage is positively correlated with the second bus voltage target value.
Preferably, the first corresponding relationship includes:
when the input voltage of the main circuit is less than or equal to a preset first input threshold value, the value of the corresponding first bus voltage target value is a preset first numerical value;
when the main circuit input voltage is greater than the first input threshold value, the value of the corresponding first bus voltage target value is a preset second numerical value, and the second numerical value is greater than the first numerical value;
the second correspondence includes:
when the bypass input voltage is less than or equal to a preset second input threshold value, the value of the corresponding second bus voltage target value is the first numerical value;
and when the bypass input voltage is greater than the second input threshold value, the value of the corresponding second bus voltage target value is the second numerical value.
Preferably, each uninterruptible power supply is provided with a rectification controller and an inversion controller in communication connection with the rectification controller, and the inversion controllers of the uninterruptible power supplies are in communication connection with each other;
correspondingly, the detecting the main circuit input voltage comprises:
the rectification controller of each uninterrupted power supply receives the detected input voltage of the main circuit;
the determining a current bus voltage target value based on the main circuit input voltage includes:
each rectification controller determines a current bus voltage target value based on the main circuit input voltage and respectively sends the current bus voltage target value to an inversion controller in communication connection with the rectification controller;
the method for controlling the voltage target value of the bus of each parallel uninterrupted power supply in the uninterrupted power supply system is the currently determined voltage target value of the bus, and comprises the following steps:
any one inverter controller sends the bus voltage target value sent by the rectification controller in communication connection with the inverter controller to the other inverter controllers, and receives the bus voltage target values sent by the other inverter controllers;
and any one of the inverter controllers takes the bus voltage target value sent by the rectifying controller in communication connection with the inverter controller and the maximum value of the bus voltage target values sent by the other inverter controllers as the determined bus voltage target value, and feeds the determined bus voltage target value back to the rectifying controller in communication connection with the inverter controller, so that the bus voltage target value of the uninterruptible power supply controlled by each rectifying controller is the bus voltage target value received by the rectifying controller.
A bus voltage control system for an uninterruptible power supply system, comprising:
the main circuit input voltage detection module is used for detecting the main circuit input voltage;
the bus voltage target value determining module is used for determining a current bus voltage target value based on the main circuit input voltage;
the bus voltage target value synchronous control module is used for controlling the bus voltage target values of all the parallel uninterrupted power supplies in the uninterrupted power supply system to be the currently determined bus voltage target values;
the uninterrupted power system at least comprises 2 uninterrupted power supplies connected in parallel.
Preferably, the method further comprises the following steps:
the bypass switching preparation state judgment module is used for judging whether at least one uninterrupted power supply is in a bypass switching preparation state;
if yes, triggering a bypass input voltage detection module for detecting the bypass input voltage;
correspondingly, the bus voltage target value determining module is specifically configured to:
and determining a current bus voltage target value based on the main circuit input voltage and the bypass input voltage.
Preferably, the bus voltage target value determining module is specifically configured to:
determining a first bus voltage target value corresponding to the input voltage of the main circuit according to a preset first corresponding relation;
determining a second bus voltage target value corresponding to the bypass input voltage according to a preset second corresponding relation;
taking the maximum value of the first bus voltage target value and the second bus voltage target value as the determined current bus voltage target value;
wherein in the first correspondence the main circuit input voltage is positively correlated with the first bus voltage target value, and in the second correspondence the bypass input voltage is positively correlated with the second bus voltage target value.
A bus voltage control apparatus of an uninterruptible power supply system, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the bus voltage control method of the uninterruptible power supply system.
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of bus voltage control of an uninterruptible power supply system as described in any one of the above.
By applying the technical scheme provided by the embodiment of the invention, the applicant considers that in a parallel system, when the bus voltage target values of two uninterruptible power supplies are inconsistent, high-frequency circulation can easily occur, so that the direct-current bus voltage is not increased under the control of a rectifier, and overvoltage protection and even device damage are caused. Specifically, in order to take account of both dynamic response and overall efficiency, the scheme of the application detects the input voltage of the main circuit instead of setting a fixed bus voltage target value, and determines the current bus voltage target value based on the input voltage of the main circuit, so that the determined current bus voltage target value can ensure good dynamic response and overall efficiency. After the current bus voltage target value is determined, the bus voltage target values of all the parallel uninterrupted power supplies in the uninterrupted power supply system are controlled to be the currently determined bus voltage target values, namely, the synchronization of the bus voltage target values of all the parallel uninterrupted power supplies is realized, so that the situation that the direct-current bus voltage is increased without control due to high-frequency circulation can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating an exemplary method for controlling bus voltage of an ups system according to the present invention;
FIG. 2 is a schematic diagram of an uninterruptible power supply system with a bypass circuit according to an embodiment of the invention;
fig. 3 is a schematic diagram of communication structures of a rectification controller and an inversion controller of 2 parallel ups according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a bus voltage control system of an uninterruptible power supply system according to the present invention.
Detailed Description
The core of the invention is to provide a bus voltage control method of an uninterruptible power supply system, which can ensure good dynamic response and overall efficiency and avoid the situation that the direct current bus voltage is not controlled to rise.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a method for controlling a bus voltage of an ups system according to an embodiment of the present invention, where the method for controlling the bus voltage of the ups system includes the following steps:
step S101: the main circuit input voltage is detected.
In practical applications, the magnitude of the input voltage of the main circuit may change due to a change in power consumption environment and the like. The detection of the input voltage of the main circuit can be realized through devices such as a voltage sensor, real-time detection can be realized, and detection can also be carried out according to a preset detection period.
Step S102: a current bus voltage target value is determined based on the main circuit input voltage.
The utility model provides a corresponding relation between main circuit input voltage and the busbar voltage target value can be predetermine to this application, and concrete content can be set for and adjust according to actual need, for example can be linear corresponding relation, be favorable to accurately determining required busbar voltage target value, like can be the corresponding relation of sectional type again for when main circuit input voltage undulant little, need not to carry out the adjustment of busbar voltage target value, can avoid appearing too frequently, the condition of adjustment meaninglessly.
It is understood that the determined current bus voltage target value should have a positive correlation with the detected input voltage of the main circuit, thereby being beneficial to ensuring the system efficiency and stability.
Step S103: and controlling the bus voltage target value of each parallel uninterrupted power supply in the uninterrupted power supply system to be the currently determined bus voltage target value.
The UPS system at least comprises 2 paralleled UPS.
The utility model provides a parallel operation system, including 2 uninterrupted power source that connect in parallel at least in the uninterrupted power source system promptly, after having determined current bus voltage target value, this application can carry out the synchronization of this bus voltage target value, and this application can control the bus voltage target value of each uninterrupted power source that connects in parallel in the uninterrupted power source system promptly and be the bus voltage target value of present determination.
Due to the fact that the bus voltage target values are synchronized, the problem caused by inconsistency of the bus voltage target values can be avoided while efficiency and stability are considered.
In an embodiment of the present invention, the method may further include:
judging whether at least one uninterrupted power supply is in a bypass switching preparation state;
if yes, detecting the bypass input voltage;
correspondingly, step S102 may specifically be: and determining the current bus voltage target value based on the main circuit input voltage and the bypass input voltage.
In the foregoing embodiment, the current bus voltage target value is determined based on the main circuit input voltage, so as to effectively ensure the efficiency and stability of the system, and in this embodiment, it is further considered that a bypass circuit exists in some cases, for example, fig. 2 is a schematic structural diagram of an uninterruptible power supply system having a bypass circuit in a specific case. If a certain uninterruptible power supply needs to be switched from a bypass to an inverter or from the inverter to the bypass, in order to ensure that the output voltage is uninterrupted during switching, the output voltage of the inverter needs to be adjusted in magnitude and phase so as to completely track the bypass. However, if the bypass input voltage is high and the target value of the bus voltage is low, the output voltage of the inverter may be clipped, that is, the output voltage of the inverter cannot track the bypass well, which is not beneficial to ensuring the stability of the system.
In such an embodiment, a determination is made as to whether at least one ups is in a bypass switch ready state. For any ups, it is considered to be in a bypass switch ready state if the ups is to be switched from bypass to inverter, or vice versa.
When at least one uninterrupted power supply is in a bypass switching preparation state, the method and the device can detect the bypass input voltage, and determine the current bus voltage target value based on the main circuit input voltage and the bypass input voltage.
That is, in this embodiment, when determining the current bus voltage target value, not only the factor of the main circuit input voltage but also the factor of the bypass input voltage are taken into consideration, so that the stability of the system can be effectively guaranteed when performing the bypass switching.
In practical application, when the bypass switching is completed, that is, any uninterruptible power supply is not in a bypass switching preparation state, whether at least one bypass works at present can be judged, and if the at least one bypass works, the current bus voltage target value can be determined continuously based on the main circuit input voltage and the bypass input voltage. If not, i.e., each ups is voltage output using an inverter, then a return can be made to determining the current bus voltage target based on the main circuit input voltage.
The specific operation of determining the current bus voltage target value based on the main circuit input voltage and the bypass input voltage can be set according to actual conditions, and a simpler and more convenient scheme is to set according to the maximum value of the required bus voltage target value, so that the determined bus voltage target value can be suitable for the current main circuit input voltage and the bypass input voltage.
That is, in an embodiment of the present invention, determining the current bus voltage target value based on the main circuit input voltage and the bypass input voltage may specifically include the following steps:
the method comprises the following steps: determining a first bus voltage target value corresponding to the input voltage of the main circuit according to a preset first corresponding relation;
step two: determining a second bus voltage target value corresponding to the bypass input voltage according to a preset second corresponding relation;
step three: taking the maximum value of the first bus voltage target value and the second bus voltage target value as the determined current bus voltage target value;
wherein in the first correspondence, the main circuit input voltage is positively correlated with the first bus voltage target value, and in the second correspondence, the bypass input voltage is positively correlated with the second bus voltage target value.
It will be appreciated that the first bus voltage target value corresponding to the main circuit input voltage, which is determined according to the preset first corresponding relationship, can be applied to the current main circuit input voltage, that is, the bus voltage target value finally determined in step three, and should not be lower than the first bus voltage target value in general, so as to avoid the situation that the bus voltage target value is lower than the peak value of the main circuit input voltage.
Similarly, the second bus voltage target value corresponding to the bypass input voltage is determined according to the preset second corresponding relationship, and the second bus voltage target value can be applied to the current bypass input voltage, that is, the bus voltage target value finally determined in the third step, and should not be lower than the second bus voltage target value in general, so as to avoid the occurrence of output voltage topping when performing bypass switching.
Therefore, in this embodiment, the maximum value between the first bus voltage target value and the second bus voltage target value is directly used as the determined current bus voltage target value, which is simple and convenient, and the bus voltage target value is not lower than the peak value of the main circuit input voltage, and the output voltage top-cutting when the bypass switching is performed is not caused.
The specific contents of the first corresponding relationship and the second corresponding relationship may be set according to actual needs, for example, in combination with the above description, the first corresponding relationship may be a linear corresponding relationship or a sectional corresponding relationship, but since the higher the main circuit input voltage is, the higher the required bus voltage target value is, the higher the bus voltage target value is, in the first corresponding relationship, the main circuit input voltage and the first bus voltage target value need to be in a positive correlation. Similarly, the higher the bypass input voltage, the higher the desired bus voltage target value, and therefore, in the second correspondence, the bypass input voltage needs to be positively correlated with the second bus voltage target value.
In one embodiment of the present invention, the first correspondence relationship comprises:
when the input voltage of the main circuit is less than or equal to a preset first input threshold value, the value of the corresponding first bus voltage target value is a preset first numerical value;
when the input voltage of the main circuit is greater than a first input threshold value, the value of the corresponding first bus voltage target value is a preset second numerical value, and the second numerical value is greater than the first numerical value;
the second correspondence includes:
when the bypass input voltage is less than or equal to a preset second input threshold value, the value of the corresponding second bus voltage target value is a first numerical value;
and when the bypass input voltage is greater than the second input threshold value, the value of the corresponding second bus voltage target value is a second numerical value.
The specific values of the first input threshold and the second input threshold can be set and adjusted according to actual needs. In this embodiment, the first corresponding relationship and the second corresponding relationship are both segmented corresponding relationships, and in this embodiment, the first bus voltage target value has only 2 possible values: the first value or the second value, similarly, the value of the second bus voltage target value is only 2 possible: the first value or the second value, so that the finally determined bus voltage target value is only possible in the following 2 types: the first value or the second value, namely the bus voltage target value, is only selectable by 2 gears.
According to the implementation mode, on one hand, the contents of the first corresponding relation and the second corresponding relation are simple and convenient to set, and on the other hand, data transmission is very easy. Specifically, when the scheme of the present application is executed, each step of the present application may be implemented by a single controller, but the requirement for the single controller is high, in practical applications, it is more common that each uninterruptible power supply has its own rectification controller and an inverter controller in communication connection with its own rectification controller, at this time, in order to implement synchronization of the bus voltage target values between the uninterruptible power supplies, it is necessary to transmit information of the current bus voltage target value, for example, when the first corresponding relationship and the second corresponding relationship are linear corresponding relationships, it is necessary to transmit a value of a specific bus voltage target value, the data size is large, and interference is easily caused. In the embodiment, the target value of the bus voltage is only selectable by 2 gears, and the information of which gear needs to be selected currently is transmitted, so that the transmission process is very convenient and is not easily interfered.
In a specific embodiment of the present invention, each uninterruptible power supply has its own rectification controller and an inverter controller communicatively connected to the own rectification controller, and the inverter controllers of the uninterruptible power supplies are communicatively connected to each other;
correspondingly, step S101 may specifically include:
the rectification controller of each uninterrupted power supply receives the detected input voltage of the main circuit;
step S102 may specifically include:
each rectification controller determines a current bus voltage target value based on the main circuit input voltage and respectively sends the current bus voltage target value to an inversion controller in communication connection with the rectification controller;
step S103 may specifically include:
any one inverter controller transmits the bus voltage target value transmitted by the rectification controller in communication connection with the inverter controller to the rest inverter controllers, and receives the bus voltage target values transmitted by the rest inverter controllers;
and any one of the inverter controllers takes the bus voltage target value sent by the rectifying controller in communication connection with the inverter controller and the maximum value of the bus voltage target values sent by the other inverter controllers as the determined bus voltage target value, and feeds the determined bus voltage target value back to the rectifying controller in communication connection with the inverter controller, so that the bus voltage target value of the uninterrupted power supply controlled by each rectifying controller is the bus voltage target value received by the rectifying controller.
In this embodiment, each ups has its own rectifier controller and an inverter controller communicatively connected to the own rectifier controller, and the inverter controllers of the upss are communicatively connected to each other, which is also a commonly used scheme at present, for example, fig. 3 is a schematic diagram of a communication structure of the respective rectifier controller and the inverter controller of each of 2 parallel upss in a specific situation.
Specifically, a single sensor may detect the input voltage of the main circuit and send the detection result to the rectifier controllers of the uninterruptible power supplies, or the rectifier controllers of the uninterruptible power supplies may each detect the input voltage of the main circuit, without affecting the implementation of the present invention. Of course, in practical applications, if the detected values differ too much when the respective rectifier controllers of the uninterruptible power supplies detect the input voltages of the main circuits, measures such as alarm prompt may be implemented.
And each rectification controller determines a current bus voltage target value based on the main circuit input voltage and respectively sends the current bus voltage target value to the inversion controller in communication connection with the rectification controller.
For example, in a specific case, when the main circuit input voltage is less than or equal to the preset first input threshold value of 250V, the rectification controller may determine that the current bus voltage target value is the preset first value of 360V. When the main circuit input voltage is greater than 250V, the rectification controller may determine that the current bus voltage target value is a preset second value of 400V. Taking the rectifier controller 1 in fig. 3 as an example, for example, when the rectifier controller 1 determines that the current bus voltage target value is 400V, this information may be sent to the inverter controller 1 communicatively connected to itself.
It should be noted that, when the bus voltage target value is selectable only in a plurality of gears, the information transmission can be realized by a plurality of electrical signals instead of the specific value of the bus voltage target value. For example, in the above example, if the rectification controller 1 determines that the current bus voltage target value is 360V, an electrical signal 0 may be sent to the inverter controller 1 to indicate that the rectification controller 1 determines that the current bus voltage target value is 360V. If the rectification controller 1 determines that the current bus voltage target value is 400V, an electrical signal 1 may be sent to the inverter controller 1 to indicate that the rectification controller 1 determines that the current bus voltage target value is 400V.
Any one of the inverter controllers transmits the bus voltage target value transmitted by the rectification controller in communication connection with the inverter controller to each of the other inverter controllers, and receives the bus voltage target value transmitted by each of the other inverter controllers, for example, in fig. 3, the inverter controller 1 transmits an electric signal 1 to the inverter controller 2, and receives the bus voltage target value transmitted by the inverter controller 2, for example, an electric signal 0 is transmitted by the inverter controller 2, which indicates that the rectification controller 2 determines that the current bus voltage target value is 360V.
Then, the inverter controller 1 determines the maximum value of the bus voltage target value 400V transmitted from the rectification controller 1 and the bus voltage target value 360V transmitted from the inverter controller 2 as 400V, and feeds the determined bus voltage target value back to the rectification controller 1. In this example, the electric signal 1 is fed back to the rectifier controller 1, so that the rectifier controller 1 controls the bus voltage target value of the corresponding uninterruptible power supply 1 to be 400V.
Similarly, the inverter controller 2 determines the maximum value of the bus voltage target value 360V transmitted from the rectifier controller 2 and the bus voltage target value 400V transmitted from the inverter controller 1, which is 400V, as the determined bus voltage target value, and feeds back the determined bus voltage target value to the rectifier controller 2. In this example, the electric signal 1 is fed back to the rectification controller 2, so that the rectification controller 2 controls the bus voltage target value of the corresponding uninterruptible power supply 2 to be 400V.
Furthermore, in the foregoing embodiment, it is described that when determining the bus voltage target value, not only the main circuit input voltage but also the bypass input voltage are taken into consideration, and applied to this embodiment, the current bus voltage target value may be determined by each inverter controller based on the main circuit input voltage and the bypass input voltage. When each inverter controller determines the current bus voltage target value, the maximum value is determined through communication connection with other inverter controllers, so that each uninterruptible power supply controls the bus voltage target value according to the maximum value.
By applying the technical scheme provided by the embodiment of the invention, the applicant considers that in a parallel system, when the bus voltage target values of two uninterruptible power supplies are inconsistent, high-frequency circulating current is easy to occur, so that the direct current bus voltage is not increased under the control of a rectifier, and overvoltage protection and even device damage are caused. Specifically, in order to take account of both dynamic response and overall efficiency, the scheme of the application detects the input voltage of the main circuit instead of setting a fixed bus voltage target value, and determines the current bus voltage target value based on the input voltage of the main circuit, so that the determined current bus voltage target value can ensure good dynamic response and overall efficiency. After the current bus voltage target value is determined, the bus voltage target values of all the parallel uninterruptible power supplies in the uninterruptible power supply system are controlled to be the currently determined bus voltage target values, namely, the bus voltage target values of all the parallel uninterruptible power supplies are synchronized, so that the situation that the direct-current bus voltage is increased due to high-frequency circulation cannot occur.
Corresponding to the above method embodiments, embodiments of the present invention further provide a bus voltage control system of an uninterruptible power supply system, which can be referred to in correspondence with the above.
Referring to fig. 4, a schematic structural diagram of a bus voltage control system of an uninterruptible power supply system according to the present invention is shown, including:
a main circuit input voltage detection module 401, configured to detect a main circuit input voltage;
a bus voltage target value determining module 402, configured to determine a current bus voltage target value based on the main circuit input voltage;
a bus voltage target value synchronous control module 403, configured to control that the bus voltage target values of all parallel uninterruptible power supplies in the uninterruptible power supply system are the currently determined bus voltage target values;
the UPS system at least comprises 2 paralleled UPS.
In an embodiment of the present invention, the method further comprises:
the bypass switching preparation state judgment module is used for judging whether at least one uninterrupted power supply is in a bypass switching preparation state;
if yes, triggering a bypass input voltage detection module for detecting the bypass input voltage;
correspondingly, the bus voltage target value determining module 402 is specifically configured to:
and determining a current bus voltage target value based on the main circuit input voltage and the bypass input voltage.
In an embodiment of the present invention, the bus voltage target value determining module 402 is specifically configured to:
determining a first bus voltage target value corresponding to the input voltage of the main circuit according to a preset first corresponding relation;
determining a second bus voltage target value corresponding to the bypass input voltage according to a preset second corresponding relation;
taking the maximum value of the first bus voltage target value and the second bus voltage target value as the determined current bus voltage target value;
wherein in the first correspondence, the main circuit input voltage is positively correlated with the first bus voltage target value, and in the second correspondence, the bypass input voltage is positively correlated with the second bus voltage target value.
In one embodiment of the present invention, the first correspondence relationship comprises:
when the input voltage of the main circuit is less than or equal to a preset first input threshold value, the value of the corresponding first bus voltage target value is a preset first numerical value;
when the input voltage of the main circuit is greater than a first input threshold value, the value of the corresponding first bus voltage target value is a preset second numerical value, and the second numerical value is greater than the first numerical value;
the second correspondence includes:
when the bypass input voltage is less than or equal to a preset second input threshold value, the value of the corresponding second bus voltage target value is a first numerical value;
and when the bypass input voltage is greater than the second input threshold value, the value of the corresponding second bus voltage target value is a second numerical value.
In a specific embodiment of the present invention, each uninterruptible power supply has its own rectification controller and an inversion controller communicatively connected to its own rectification controller, and the inversion controllers of the uninterruptible power supplies are communicatively connected to each other;
accordingly, detecting a main circuit input voltage comprises:
receiving the detected input voltage of the main circuit by a rectification controller of each uninterrupted power supply;
determining a current bus voltage target value based on the main circuit input voltage, including:
each rectification controller determines a current bus voltage target value based on the input voltage of the main circuit and respectively sends the current bus voltage target value to an inversion controller in communication connection with the rectification controller;
the method for controlling the bus voltage target value of each parallel uninterrupted power supply in the uninterrupted power supply system is the currently determined bus voltage target value, and comprises the following steps:
any one inverter controller sends the bus voltage target value sent by the rectification controller in communication connection with the inverter controller to the other inverter controllers, and receives the bus voltage target values sent by the other inverter controllers;
and any one of the inverter controllers takes the bus voltage target value sent by the rectifying controller in communication connection with the inverter controller and the maximum value of the bus voltage target values sent by the other inverter controllers as the determined bus voltage target value, and feeds the determined bus voltage target value back to the rectifying controller in communication connection with the inverter controller, so that the bus voltage target value of the uninterrupted power supply controlled by each rectifying controller is the bus voltage target value received by the rectifying controller.
Corresponding to the above method and system embodiments, the present invention further provides a bus voltage control apparatus of an uninterruptible power supply system and a computer readable storage medium, where the computer readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the bus voltage control method of the uninterruptible power supply system in any of the above embodiments. A computer-readable storage medium as referred to herein may include Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The bus voltage control apparatus of the uninterruptible power supply system may include:
a memory for storing a computer program;
and a processor for executing a computer program to implement the steps of the bus voltage control method of the uninterruptible power supply system in any of the above embodiments.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A bus voltage control method of an uninterruptible power supply system is characterized by comprising the following steps:
detecting the input voltage of a main circuit;
determining a current bus voltage target value based on the main circuit input voltage;
controlling the bus voltage target value of each parallel uninterrupted power supply in the uninterrupted power supply system to be the currently determined bus voltage target value;
the uninterruptible power supply system at least comprises 2 uninterruptible power supplies connected in parallel;
each uninterruptible power supply is provided with a rectification controller and an inversion controller in communication connection with the rectification controller, and the inversion controllers of the uninterruptible power supplies are in communication connection with each other;
correspondingly, the detecting the input voltage of the main circuit comprises the following steps:
receiving the detected input voltage of the main circuit by a rectification controller of each uninterrupted power supply;
the determining a current bus voltage target value based on the main circuit input voltage includes:
each rectification controller determines a current bus voltage target value based on the main circuit input voltage and respectively sends the current bus voltage target value to an inversion controller in communication connection with the rectification controller;
the method for controlling the bus voltage target value of each parallel uninterrupted power supply in the uninterrupted power supply system is the currently determined bus voltage target value, and comprises the following steps:
any one inverter controller transmits the bus voltage target value transmitted by the rectification controller in communication connection with the inverter controller to the rest inverter controllers, and receives the bus voltage target values transmitted by the rest inverter controllers;
and any one of the inverter controllers takes the bus voltage target value sent by the rectifying controller in communication connection with the inverter controller and the maximum value of the bus voltage target values sent by the other inverter controllers as the determined bus voltage target value, and feeds the determined bus voltage target value back to the rectifying controller in communication connection with the inverter controller, so that the bus voltage target value of the uninterruptible power supply controlled by each rectifying controller is the bus voltage target value received by the rectifying controller.
2. The method of claim 1, further comprising:
judging whether at least one uninterrupted power supply is in a bypass switching preparation state;
if yes, detecting the bypass input voltage;
correspondingly, the determining a current bus voltage target value based on the main circuit input voltage includes:
and determining a current bus voltage target value based on the main circuit input voltage and the bypass input voltage.
3. The method of claim 2, wherein determining a current bus voltage target value based on the main circuit input voltage and the bypass input voltage comprises:
determining a first bus voltage target value corresponding to the input voltage of the main circuit according to a preset first corresponding relation;
determining a second bus voltage target value corresponding to the bypass input voltage according to a preset second corresponding relation;
taking the maximum value of the first bus voltage target value and the second bus voltage target value as the determined current bus voltage target value;
wherein in the first correspondence the main circuit input voltage is positively correlated with the first bus voltage target value, and in the second correspondence the bypass input voltage is positively correlated with the second bus voltage target value.
4. The method of claim 3, wherein the first correspondence comprises:
when the input voltage of the main circuit is less than or equal to a preset first input threshold value, the value of the corresponding first bus voltage target value is a preset first numerical value;
when the main circuit input voltage is greater than the first input threshold value, the value of the corresponding first bus voltage target value is a preset second numerical value, and the second numerical value is greater than the first numerical value;
the second correspondence includes:
when the bypass input voltage is less than or equal to a preset second input threshold value, the value of the corresponding second bus voltage target value is the first numerical value;
and when the bypass input voltage is greater than the second input threshold value, the value of the corresponding second bus voltage target value is the second numerical value.
5. A bus voltage control system for an uninterruptible power supply system, comprising:
the main circuit input voltage detection module is used for detecting the main circuit input voltage;
the bus voltage target value determining module is used for determining a current bus voltage target value based on the main circuit input voltage;
the bus voltage target value synchronous control module is used for controlling the bus voltage target values of all the parallel uninterrupted power supplies in the uninterrupted power supply system to be the currently determined bus voltage target values;
the uninterruptible power supply system at least comprises 2 uninterruptible power supplies connected in parallel;
each uninterruptible power supply is provided with a rectification controller and an inversion controller in communication connection with the rectification controller, and the inversion controllers of the uninterruptible power supplies are in communication connection with each other;
accordingly, detecting a main circuit input voltage comprises:
receiving the detected input voltage of the main circuit by a rectification controller of each uninterrupted power supply;
determining a current bus voltage target value based on the main circuit input voltage, including:
each rectification controller determines a current bus voltage target value based on the input voltage of the main circuit and respectively sends the current bus voltage target value to an inversion controller in communication connection with the rectification controller;
the method for controlling the bus voltage target value of each parallel uninterrupted power supply in the uninterrupted power supply system is the currently determined bus voltage target value, and comprises the following steps:
any one inverter controller transmits the bus voltage target value transmitted by the rectification controller in communication connection with the inverter controller to the rest inverter controllers, and receives the bus voltage target values transmitted by the rest inverter controllers;
and any one of the inverter controllers takes the bus voltage target value sent by the rectifying controller in communication connection with the inverter controller and the maximum value of the bus voltage target values sent by the other inverter controllers as the determined bus voltage target value, and feeds the determined bus voltage target value back to the rectifying controller in communication connection with the inverter controller, so that the bus voltage target value of the uninterrupted power supply controlled by each rectifying controller is the bus voltage target value received by the rectifying controller.
6. The system of claim 5, further comprising:
the bypass switching preparation state judgment module is used for judging whether at least one uninterrupted power supply is in a bypass switching preparation state;
if yes, triggering a bypass input voltage detection module for detecting the bypass input voltage;
correspondingly, the bus voltage target value determining module is specifically configured to:
and determining a current bus voltage target value based on the main circuit input voltage and the bypass input voltage.
7. The system of claim 6, wherein the bus voltage target value determination module is specifically configured to:
determining a first bus voltage target value corresponding to the input voltage of the main circuit according to a preset first corresponding relation;
determining a second bus voltage target value corresponding to the bypass input voltage according to a preset second corresponding relation;
taking the maximum value of the first bus voltage target value and the second bus voltage target value as the determined current bus voltage target value;
wherein in the first correspondence the main circuit input voltage is positively correlated with the first bus voltage target value, and in the second correspondence the bypass input voltage is positively correlated with the second bus voltage target value.
8. A bus voltage control apparatus for an uninterruptible power supply system, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the bus voltage control method of the uninterruptible power supply system of any of claims 1 to 4.
9. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of bus voltage control of an uninterruptible power supply system as claimed in any of claims 1 to 4.
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| PCT/CN2021/108112 WO2023000297A1 (en) | 2021-07-23 | 2021-07-23 | Bus voltage control method and system for uninterruptible power supply system, and related component |
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| CN112751400A (en) * | 2020-12-28 | 2021-05-04 | 漳州科华技术有限责任公司 | Current-sharing control method for power supply parallel operation system and terminal equipment |
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| CN2591840Y (en) * | 2001-12-07 | 2003-12-10 | 广东志成冠军电子实业有限公司 | Bus controlled parallel uninterruption power source |
| US7492058B2 (en) * | 2006-11-17 | 2009-02-17 | Toshiba International Corp. | Modular uninterruptible power supply with loadsharing between modules |
| US7667351B2 (en) * | 2007-04-27 | 2010-02-23 | Liebert Corporation | Method for pulse width modulation synchronization in a parallel UPS system |
| JP5067211B2 (en) * | 2008-03-07 | 2012-11-07 | 富士電機株式会社 | Uninterruptible power supply parallel system and uninterruptible power supply |
| CN102231604A (en) * | 2011-07-06 | 2011-11-02 | 深圳市英威腾电源有限公司 | Rectifier and uninterruptible power system (UPS) |
| CN102497009A (en) * | 2011-12-19 | 2012-06-13 | 广东易事特电源股份有限公司 | Bus soft start circuit of uninterrupted power supply, and method for the same |
| WO2015111019A1 (en) * | 2014-01-27 | 2015-07-30 | Chloride Srl | System and method for detecting and correcting dc bus imbalances between parallel coupled ups systems sharing a common battery |
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| CN108631579B (en) * | 2018-06-12 | 2019-12-20 | 漳州科华技术有限责任公司 | UPS and method, system and equipment for adjusting DC bus voltage thereof |
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