Power supply automatic conversion method and device based on time management, and storage medium

Abstract

The invention relates to a power supply automatic conversion method and system based on time management, which can effectively avoid the problems of power supply damage and power failure, ensure the reliable operation of a power system, reduce the power failure time and improve the user satisfaction. The method comprises the following steps: monitoring and calculating parameter values of a power supply; a power supply fault condition is determined based on comparison of a power supply parameter value and a corresponding threshold value through an automatic conversion and time interval return algorithm; and switching the switching position to different switching states for the determined condition of the power supply fault based on a time management algorithm by an automatic transition and a return over time interval algorithm.

Description

Technical Field

[0001] The present disclosure relates to the field of power systems, and more particularly, to a power supply automatic conversion method based on time management, an apparatus for performing the power supply automatic conversion method based on time management, and a storage medium. Background Art

[0002] With the development of modern society, power systems have become increasingly complex, and the management and control of power supplies have become increasingly important. Currently, the mainstream power distribution design for newly built residential buildings in urban areas is a two-incoming line and one bus-coupler design. When a power supply fails, the power supply automatic conversion system automatically disconnects the faulty power supply incoming switch and closes the bus-coupler switch. At this time, a single power supply supplies two busbars, and the power load rate increases. If the load rate exceeds the allowable capacity of the single power supply for a certain period of time, the power supply will be damaged, resulting in a power outage of both busbars. Such a power distribution design has some problems, such as power supply damage and power outage problems caused by excessive load rates, high manual intervention costs, instability and reliability that affect residents' electricity consumption. Therefore, the prior art still needs to be improved. Summary of the Invention

[0003] In view of the deficiencies of the above prior art, the present disclosure relates to a power supply automatic conversion method based on time management, which can achieve power supply automatic conversion based on time management, and when the single power supply is in operation, immediately cut off the bus-coupler switch and lock the conversion system after the load rate exceeds the set value for a certain period of time, and then return to the automatic conversion control after a period of time, so as to effectively avoid power supply damage and power outage problems. When the faulty power supply is restored, the power supply automatic conversion system will disconnect the bus-coupler switch and close the incoming switch, and return to the split operation state. This will cause a power outage, which will cause trouble to residents' electricity consumption if the conversion occurs during the day. Therefore, the algorithm involved in the present disclosure can also set the time interval for returning to the split operation state (for example, the operation of the power supply automatic conversion system returning from single busbar power supply to split operation can only occur within the set time period (such as early morning), and no operation occurs at other times), so as to reduce the impact of power outages.

[0004] According to one aspect of the present disclosure, there is provided a power supply automatic conversion method based on time management, the method comprising: monitoring and calculating parameter values of a power supply; determining a power supply fault condition based on a comparison of the power supply parameter values with corresponding thresholds by an automatic conversion and return-by-time-interval algorithm; and switching a switch position to different switch states based on a time management algorithm for the determined power supply fault condition by the automatic conversion and return-by-time-interval algorithm.

[0005] According to another aspect of the present disclosure, there is provided an apparatus for performing the power supply automatic conversion method based on time management, the apparatus being configured to perform the method.

[0006] According to another aspect of the present disclosure, there is provided a computer storage medium having instructions stored thereon, the instructions being configured to execute the method.

[0007] According to embodiments of the present disclosure, these algorithms can be implemented by programming and integrated into a power automatic conversion system using the algorithms. The system can monitor the power status in real time and automatically execute conversion operations according to a predetermined logic. Through the application of this combined algorithm, the reliable operation of the power system can be ensured, while reducing the power outage time and improving user satisfaction, avoiding secondary power outages during peak electricity consumption and single busbar overload problems. The problem that the automatic conversion cannot be automatically returned after overload is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] As the following description of the embodiments in conjunction with the drawings, aspects, features and advantages of the present disclosure will become clearer and easier to understand. In the drawings:

[0009] Figure 1 A simplified diagram of two inlets and one bus tie according to an embodiment of the present disclosure is shown;

[0010] Figure 2 A flowchart of a power parameter monitoring algorithm according to an embodiment of the present disclosure is shown;

[0011] Figure 3 A flowchart of an implementation time management algorithm according to an embodiment of the present disclosure is shown;

[0012] Figure 4 A flowchart of an implementation of an automatic conversion and return algorithm according to time intervals according to an embodiment of the present disclosure is shown;

[0013] Figure 5 A flowchart of an implementation of an overload disconnection of the bus tie and return algorithm according to an embodiment of the present disclosure is shown; and

[0014] Figure 6 A schematic diagram of the operation relationship of each sub-algorithm according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present disclosure will be described in detail below with reference to exemplary embodiments of the present disclosure. However, the present disclosure is not limited to the embodiments described herein and can be implemented in many different forms. The described embodiments are only used to make the present disclosure thorough and complete and to fully convey the concept of the present disclosure to those skilled in the art. The features of the described embodiments can be combined or replaced with each other, unless explicitly excluded or should be excluded according to the context.

[0016] In the embodiments of the present invention, unless otherwise clearly stated, "connection" and "switching on" do not necessarily mean "direct connection" or "direct contact", but only require electrical connection. In addition, expressions such as "first", "second", etc. or similar expressions in this article are only used for descriptive and differentiating purposes, and do not represent any priority or order, and cannot be understood as indicating or implying the relative importance of the corresponding components, nor does it represent whether the described parameter values are the same or different.

[0017] Figure 1 A simplified diagram of two incoming lines and one bus tie according to an embodiment of the present disclosure is shown.

[0018] In Figure 1 it, the two incoming lines refer to two independent power source incoming lines in the power system, and each incoming line can independently supply power to the system. The one bus tie means that the two incoming lines respectively carry a busbar, and single busbar operation is realized when the bus tie switch is closed, that is, when one incoming line fails, the other incoming line can continue to supply power to the system through the bus tie. Under normal circumstances, the two power sources are normal, the bus tie switch is in the off state, and the two incoming line switches are closed, that is, the No. 1 incoming line switch and the No. 2 incoming line switch are closed, and the two are operated separately; in the case of a failure of one power source, the incoming line switch of the faulty line is disconnected, and the bus tie switch is closed, so that the system operates in a state where one incoming line supplies two busbars.

[0019] Figure 2 A flowchart for implementing a power parameter monitoring algorithm according to an embodiment of the present disclosure is shown.

[0020] The power parameters of the power automatic conversion device include voltage value and current value. The voltage value is the basis for the judgment of the automatic conversion logic, and the current value is the basis for the judgment of the load rate during single busbar power supply. The power parameter monitoring algorithm according to an embodiment of the present disclosure is designed to monitor the sampling algorithms of the above two parameters to calculate the voltage value and current value.

[0021] According to an embodiment of the present disclosure, in step S210, an AD acquisition is used to acquire voltage and current signals. Optionally, to ensure the accuracy of sampling, the sampling rate is 64 points per 20 milliseconds. In step S210, every time the 20ms / 64 timing arrives, a sampling will be triggered and enter step S220 to store the data in the current buffer. In step S230, it is judged whether 64 pieces of data are stored in the storage area. If the buffer is full of 64 pieces of data, step S240 is executed to perform buffer switching, that is, automatically swap the No. 2 buffer to the current buffer; if the buffer is not full of 64 pieces of data, return to execute step S210. Optionally, in order to ensure the smoothness of data and guarantee the real-time calculation, a double-buffer storage method is adopted here. Specifically, as Figure 1As shown, the sampling algorithm has two buffers, Buffer 1 and Buffer 2. By default, Buffer 1 is the current buffer. Sampling is triggered every 20 ms / 64 timing arrival, and the data is stored in the current buffer. When the buffer is full with 64 pieces of data, Buffer 2 is automatically swapped to be the current buffer. In step S250, a semaphore is sent to notify the calculation module that the data is ready. In step S260, the calculation module waits to receive the semaphore. After receiving the semaphore, the calculation module immediately executes step S270 to immediately calculate the voltage and current values and store them in the shared buffer (buffer). Optionally, the calculation is performed using the root mean square method.

[0022] According to an embodiment of the present disclosure, the 6-channel voltage values and 6-channel current values can be updated every 20 ms.

[0023] The power parameter monitoring algorithm of the embodiment of the present disclosure can achieve real-time monitoring of the power status.

[0024] Figure 3 A flowchart showing the implementation of the time management algorithm according to an embodiment of the present disclosure is shown.

[0025] According to an embodiment of the present disclosure, the power automatic conversion device calls the time management algorithm before each conversion of the system control switch action. The function of the time management algorithm is to detect whether the upcoming switch action meets the time condition requirements. If the time condition is met, a state conversion occurs; otherwise, the current state remains unchanged.

[0026] The time management algorithm has two types of time inputs. The first type is the "delay arrival" in step S310. It is judged whether the time input is a delay arrival. If the time input is "delay arrival", in step S320, a delay threshold is set, that is, a timer is started before each switch action. If the timer reaches the set time (delay threshold), delayFlg is set to true. The second type is the "whether time interval" in step S315. If the time input is "whether time interval", in step S325, an interval threshold is set, that is, it is judged whether the current time is within the set range (interval threshold) before each switch action. If it is within the set range, tframeFlg is set to true.

[0027] After setting the thresholds for the two types of time inputs, in step S330, one of the "delay mode", "interval mode", and "delay + interval mode" can be selected as the time management mode according to needs, which is a prerequisite for the switch operation. If the "delay mode" is selected, step S331 is executed. In step S331, the switch operation can be executed as long as delayFlg is true. If the "interval mode" is selected, step S332 is executed. In step S332, the switch operation can be executed as long as tframeFlg is true. If the "delay + interval mode" is selected, step S333 is executed. In step S333, the switch operation can be executed only when both delayFlg and tframeFlg are true. According to an embodiment of the present disclosure, the time management algorithm can provide different time management according to different requirements, thereby meeting different automatic conversion requirements, increasing flexibility, and ensuring automatic conversion at the best time point, reducing the impact on users.

[0028] According to an embodiment of the present disclosure, the time management algorithm can be implemented by a time management module.

[0029] Figure 4 The flowchart showing the implementation of the automatic conversion and the algorithm for returning according to time intervals according to an embodiment of the present disclosure is shown. Figure 4 The algorithm showing the automatic conversion of the switch state of the power supply automatic conversion system to achieve single bus operation and return to sectionalized operation when one of the power supplies fails based on the time management algorithm is shown.

[0030] The automatic conversion is triggered by the switch state and the power supply voltage. When the current power supply voltage is within the set range, it represents that the power supply is normal, and when the voltage exceeds the set range, it represents that the power supply has failed.

[0031] In step S410, return Figure 1 to the simplified diagram of two inlets and one bus tie shown in. The initial state is that both the No. 1 power supply and the No. 2 power supply are normal, the No. 1 incoming line switch is closed, the No. 2 incoming line switch is closed, the bus tie switch is open, and the two incoming lines are operating in a sectionalized manner. At this time, the switch state is represented by 101.

[0032] In step S420, based on Figure 2 whether the voltage value calculated by the power parameter monitoring algorithm in is beyond the set range to determine whether the power supply has failed. If the voltage value of the No. 2 power supply is greater than the corresponding voltage threshold (i.e., the No. 2 power supply has failed), then step S430 is executed, the No. 2 power supply switch is opened, and the bus tie switch is closed, and the single - circuit power supply is provided by the No. 1 power supply. At this time, the switch state is represented by 110. When the switch state is 110, in step S435, continue to monitor the change of the power supply state. If based on Figure 2The voltage value calculated by the power parameter monitoring algorithm in [[]] does not exceed the set range, that is, if it is detected that the power supply No. 2 returns to normal, then close the power supply switch No. 2 and open the bus-tie switch. At this time, the switch position returns to the switch state 101; if it is detected that the power supply No. 2 returns to normal while the power supply No. 1 fails, then open the power supply switch No. 1 and close the power supply switch No. 2. At this time, the switch position returns to the switch state 011; otherwise, if no change in the power supply state is detected, keep the current switch state 110 unchanged.

[0033] Similarly, in step S420, based on Figure 2 whether the voltage value calculated by the power parameter monitoring algorithm in [[]] exceeds the set range to determine whether the power supply fails. If the voltage value of the power supply No. 1 is greater than the corresponding voltage threshold value (that is, the power supply No. 1 fails), then execute step S440, open the power supply switch No. 1 and close the bus-tie switch, and supply power by the power supply No. 2 alone. At this time, the switch state is represented by 011. When the switch state is 011, in step S445, continue to monitor the change of the power supply state. If based on Figure 2 the voltage value calculated by the power parameter monitoring algorithm in [[]] does not exceed the set range, that is, if it is detected that the power supply No. 1 returns to normal, then close the power supply switch No. 1 and open the bus-tie switch. At this time, the switch position returns to the switch state 101; if it is detected that the power supply No. 1 returns to normal while the power supply No. 2 fails, then open the power supply switch No. 2 and close the power supply switch No. 1. At this time, the switch position returns to the switch state 110; otherwise, if no change in the power supply state is detected, keep the current switch state 011 unchanged.

[0034] According to the embodiments of the present disclosure, the automatic conversion of the switch state is realized on the basis of detecting the change of the power supply state and by invoking the time management algorithm executed by the time management module. For example, in step S420, based on Figure 2 whether the voltage value calculated by the power parameter monitoring algorithm in [[]] exceeds the set range to determine whether the power supply fails. If the power supply No. 2 fails, invoke the time management algorithm executed by the time management module to detect whether the upcoming switch action meets the time condition requirements. If the time condition is met, a state conversion occurs (execute step S430, open the power supply switch No. 2 and close the bus-tie switch, and supply power by the power supply No. 1 alone. At this time, the switch state is represented by 110), otherwise keep the current state unchanged. When the switch state is 110, in step S435, continue to monitor the change of the power supply state. If based on Figure 2The voltage value calculated by the power parameter monitoring algorithm in [[]] does not exceed the set range, that is, it is detected that the power supply No. 2 has returned to normal. The time management algorithm executed by the time management module is called to detect whether the upcoming switch action meets the time condition requirements. If the time condition is met, a state transition occurs (then close the power supply switch No. 2 and open the bus tie switch. At this time, the switch position returns to the switch state 101); if it is detected that the power supply No. 1 has returned to normal and the power supply No. 2 has a fault, the time management algorithm executed by the time management module is called to detect whether the upcoming switch action meets the time condition requirements. If the time condition is met, a state transition occurs (then open the power supply switch No. 2 and close the power supply switch No. 1. At this time, the switch position returns to the switch state 110); otherwise, if no change in the power supply state is detected, the current switch state 011 remains unchanged.

[0035] According to an embodiment of the present disclosure, the automatic conversion and time interval return algorithm can realize automatic power conversion operations based on the time management algorithm under the condition of real-time monitoring of the power supply state, thereby ensuring the reliable operation of the power system, reducing the power outage time, improving user satisfaction, and avoiding secondary power outages during peak electricity consumption.

[0036] Figure 5 The flowchart showing the implementation of the overloading disconnect bus tie and return algorithm according to an embodiment of the present disclosure is shown. The load rate is judged by relying on the incoming line current. When the incoming line current is greater than the set value, it is judged as overloaded.

[0037] Return reference Figure 4 Steps S430 and S440 in [[]], when the switch position has been in the switch state 110 or 011 for a long time (that is, in Figure 5 Step S510 of [[]]), based on Figure 2 The current value calculated by the power parameter monitoring algorithm in [[]] is used to judge whether the incoming line current is greater than the set value (current threshold) (step S520). When the incoming line current is greater than the set value, overload occurs during single bus operation. When overload occurs during single bus operation, step S530 is executed, and the time management algorithm is called. Optionally, the time management algorithm delays for a period of time. After the delay ends, if it is still overloaded, step S540 is executed to open the bus tie switch, and then step S540 is executed to lock the power automatic conversion device. After a period of time delayed by the time management algorithm (step S560), step S570 is executed to unlock the power automatic conversion device. In step S580, the power supply state change is continuously monitored. If it is detected that the power supply No. 1 is normal and the power supply No. 2 has a fault, the switch is controlled to switch to the 110 state (step S581), and return Figure 4 Continue to execute in step S430 in [[]]; if it is detected that the power supply No. 1 is normal and the power supply No. 2 is normal, the switch is controlled to switch to the 101 state (step S582), and return Figure 4continue to execute in step S410 therein; if a power failure of power supply 1 is detected and power supply 2 is normal, then control the switch to switch to the 011 state (step S583), and return Figure 4 continue to execute in step S440 therein.

[0038] According to an embodiment of the present disclosure, the automatic conversion of the switch state is implemented based on detecting a change in the power supply state and on the basis of a time management algorithm executed by invoking a time management module. For example, before executing step S581, step S582, and step S583, the time management algorithm executed by invoking the time management module is used to detect whether the upcoming switch action meets the time condition requirements. If the time condition is met, a state conversion occurs.

[0039] According to an embodiment of the present disclosure, the overload-disconnecting bus-tie and returning algorithm can solve the problem of single-bus overload and the problem that automatic return and automatic conversion cannot be performed after overload under the condition of real-time monitoring of parameter states based on the time management algorithm, so as to effectively avoid power supply damage and power outage problems, thereby ensuring the reliable operation of the power system, and at the same time can reduce the power outage time and improve user satisfaction.

[0040] Figure 6 shows a schematic diagram of the running relationship of each sub-algorithm according to an embodiment of the present disclosure.

[0041] The power supply automatic conversion algorithm based on time management used by the power supply automatic conversion device is implemented based on the mutual cooperation of each sub-algorithm. For example Figure 6 As shown, the power supply automatic conversion algorithm based on time management uses a shared buffer as the data interaction area for each sub-algorithm, and a synchronous protection mechanism is adopted for data reading and writing to ensure the real-time performance and accuracy of the data. The power parameter monitoring algorithm runs periodically as a background task to monitor and calculate power parameters (such as voltage values and current values). The time management algorithm executed by the time management module is responsible for judging the time conditions before the switch action in all algorithms. The automatic conversion and return-by-time-interval algorithm and the overload-disconnecting bus-tie and returning algorithm run in independent threads and can cooperate with each other according to the power parameters and switch states to execute corresponding algorithms.

[0042] It should be noted that, for clarity and conciseness, only parts related to the embodiments of the present invention are shown in the drawings. However, those skilled in the art should understand that the devices or components shown in the drawings may include other necessary units.

[0043] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0044] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0045] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0046] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units. They can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0047] In addition, the functional units in each embodiment of the present invention can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0048] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention.

[0049] Those skilled in the art should understand that the above specific embodiments are merely examples rather than limitations, and various modifications, combinations, partial combinations, and substitutions can be made to the embodiments of the present disclosure according to design requirements and other factors, as long as they are within the scope of the appended claims or their equivalents, that is, they belong to the scope of rights to be protected by the present disclosure.

Claims

1. A power supply automatic conversion method based on time management, the method comprises: monitoring and calculating parameter values of the power supply; determining a power supply fault condition based on a comparison between the power supply parameter values and corresponding thresholds by an automatic conversion and time interval return algorithm; and switching the switch position to different switch states for the determined power supply fault condition based on a time management algorithm by the automatic conversion and time interval return algorithm.

2. The method according to claim 1, wherein, monitoring and calculating the power supply parameter values includes monitoring and calculating the voltage value and current value by a power supply parameter monitoring algorithm; wherein, the voltage value is the basis for judgment of the automatic conversion logic, and the current value is the basis for judgment of the load rate during single busbar power supply.

3. The method according to claim 2, wherein, determining the power supply fault condition based on the comparison between the power supply parameter values and corresponding thresholds further includes: if the voltage value of the first power supply is greater than the corresponding voltage threshold, the first power supply fails; and if the voltage value of the second power supply is greater than the corresponding voltage threshold, the second power supply fails.

4. The method according to claim 3, wherein, the switch state of the switch position can be one of a first switch state, a second switch state, and a third switch state; wherein, the first switch state is that the first incoming line switch is closed, the second incoming line switch is closed, and the bus-coupling switch is opened; wherein, the second switch state is that the first incoming line switch is closed, the second incoming line switch is opened, and the bus-coupling switch is opened; wherein, the third switch state is that the first incoming line switch is opened, the second incoming line switch is closed, and the bus-coupling switch is opened.

5. The method according to claim 4, wherein, switching the switch position to different switch states for the determined power supply fault condition based on the time management algorithm further includes: when both the first power supply and the second power supply are normal, the switch position is in the first switch state; when the second power supply fails, switching the switch position to the second switch state; and when the first power supply fails, switching the switch position to the third switch state.

6. The method according to claim 1 further includes the step of returning to monitoring and calculating the parameter values of the power supply after switching the switch position to different switch states.

7. The method according to claim 1, wherein, the time management algorithm selects one of a delay mode, an interval mode, and a combination of the delay mode and the interval mode as a precondition for switch operation according to requirements.

8. The method according to claim 7, wherein, the delay mode is to start a timer before each switch operation, and if the timer reaches the delay threshold, the switch operation can be executed; wherein, the interval mode is to judge whether the current time is within the interval threshold before each switch operation, and if the current time is within the interval threshold, the switch operation can be executed; wherein, the combination of the delay mode and the interval mode is that the delay threshold and the interval threshold are satisfied simultaneously before each switch operation, and the switch operation can be executed.

9. The method according to claim 5 further includes determining whether the single busbar operation is overloaded based on a comparison between the power supply parameter values and corresponding thresholds by an overload disconnect bus-coupling and return algorithm when the switch position is in the second switch state or the third switch state.

10. The method according to claim 9, wherein, when the switch position is in the second switch state or the third switch state, determining whether the single-bus operation is overloaded based on the comparison between the power supply parameter value and the corresponding threshold further includes: when the switch position is in the second switch state, if the first incoming line current is greater than the corresponding current threshold, the single-bus operation is overloaded; and when the switch position is in the third switch state, if the second incoming line current is greater than the corresponding current threshold, the single-bus operation is overloaded.

11. The method according to claim 9 further includes: when it is determined that the single-bus operation is overloaded, based on the time management algorithm, opening and locking the bus-tie switch; unlocking based on the time management algorithm.

12. The method according to claim 11 further includes, after unlocking: determining the power supply fault condition based on the comparison between the power supply parameter value and the corresponding threshold; and switching the switch position to a different switch state based on the time management algorithm for the determined power supply fault condition.

13. The method according to claim 12 further includes, after switching the switch position to a different switch state, returning to the step of monitoring and calculating the parameter values of the power supply.

14. An apparatus for performing a power automatic conversion method based on time management, the apparatus being configured to perform the method according to any one of claims 1-13.

15. A computer storage medium having instructions stored thereon, the instructions being configured to perform the method according to any one of claims 1-13.

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