An uninterruptible power supply, a method of controlling an uninterruptible power supply, and a control device

Abstract

The application discloses an uninterrupted power supply, a method and a control device for controlling the uninterrupted power supply, and relates to the technical field of power electronics and smart grid. In the system operation, the correlation judgment mechanism between power supply states is constructed through continuous sensing of multi-source power supply states, energy storage operation states and load operation characteristics, and the power supply channel and power conversion process are progressively controlled based on the correlation judgment mechanism, so that the uninterrupted power supply can maintain continuous and stable power supply output in different operation stages such as normal power supply, abnormal power supply and power supply recovery. In the above manner, the impact on the load during the power supply state switching process is reduced, and the adaptability and operation reliability of the system in the smart grid environment are improved.

Description

Technical Field

[0001] This invention relates to the field of power electronics and smart grid technology, specifically to an uninterruptible power supply, a method for controlling an uninterruptible power supply, and a control device. Background Technology

[0002] With the continuous development of information technology, power electronics technology, and smart grid technology, electricity has become a crucial basic resource supporting the operation of modern society. In many critical application scenarios, electrical equipment is increasingly reliant on the continuity and quality of power supply. Once a power outage or fluctuation occurs, it can easily lead to equipment shutdown, data loss, or system anomalies.

[0003] Uninterruptible power supplies (UPS) are widely used in the aforementioned scenarios as crucial devices for ensuring the continuous operation of critical loads. Existing UPS systems typically combine external power supply with energy storage. When the external power supply fails, the energy storage supplies power to the load, and then switches back to external power supply once it is restored. However, in practical applications, the external power supply status is often not simply "normal" or "interrupted," but rather involves various complex situations such as fluctuations, intermittent anomalies, and gradual recovery.

[0004] Existing uninterruptible power supply (UPS) control methods often rely on fixed thresholds or single-state judgments as the basis for control. When an external power supply anomaly is detected, the system immediately switches to energy storage power supply; when external power supply is restored, it immediately switches back to external power supply. This control method is prone to frequent switching of power supply modes when power supply conditions change drastically or frequently, resulting in significant power supply fluctuations on the load side. Furthermore, traditional control methods often neglect the load's own response characteristics to power supply changes, failing to incorporate load operating requirements into the power supply control logic.

[0005] In a smart grid environment, the grid's operating state is more complex, with electricity loads exhibiting distributed and diversified characteristics, and power supply status changes more frequently. Traditional uninterruptible power supply (UPS) control methods are ill-suited to these changes and are prone to causing unnecessary shocks during power supply status transitions. Therefore, it is necessary to propose a new control approach that enables UPS to continuously and smoothly regulate the power supply process based on the relationships between various operating states. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an uninterruptible power supply, a method for controlling an uninterruptible power supply, and a control device, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an uninterruptible power supply (UPS) and a method for controlling the UPS. The UPS includes an external power supply unit, an energy storage unit, a power conversion unit, a load output unit, and a control device. The external power supply unit provides basic electrical energy input to the UPS system. The energy storage unit provides compensation energy to the load output unit when the external power supply status changes. The power conversion unit is located between the external power supply unit, the energy storage unit, and the load output unit, and is used to adjust the energy transmission relationship of different power supply paths. The control device monitors the operating status of the UPS system and controls the power conversion unit.

[0008] During the operation of the uninterruptible power supply system, the control device is used to continuously acquire the power supply continuity status and power supply stability changes of the external power supply unit, and at the same time acquire the availability status information of the energy storage unit and the operating demand information of the load output unit, and comprehensively perceive the above-mentioned multiple operating states.

[0009] Preferably, the power supply continuity status is used to characterize the continuous power supply capability of the external power supply during operation, and the power supply stability change status is used to reflect the trend characteristics of the external power supply status changing over time, so that the control device can distinguish different power supply operation stages.

[0010] Preferably, the availability status information of the energy storage unit is used to reflect the changes in the energy storage unit's ability to participate in power supply, so that the energy storage unit can cooperate with the external power supply unit to complete the power supply task at different times with different levels of participation.

[0011] Preferably, the operating demand information of the load output unit is used to reflect the load's sensitivity to power supply continuity and stability, and the control device uses the operating demand information as one of the constraints when generating the power supply control strategy.

[0012] Preferably, based on the acquired external power supply status, energy storage status, and load operating demand information, the control device constructs a correlation judgment result between power supply statuses to characterize the comprehensive relationship between multiple operating states under the current power supply conditions. This power supply status correlation result is used to guide the power supply control process, rather than directly triggering power supply mode switching based on a single operating state.

[0013] Preferably, the control device identifies the current power supply stage based on the power supply status association result and determines whether the power supply status has the conditions to evolve to other power supply stages, thereby avoiding frequent adjustments to the power supply control strategy due to short-term changes in local operating status.

[0014] In the specific control process, the control device performs progressive control on the power conversion unit based on the power supply status correlation results, so that the external power supply unit and the energy storage unit jointly participate in the load power supply in a progressive manner in different power supply stages.

[0015] Preferably, when the external power supply status changes abnormally, the control device guides the energy storage unit to gradually participate in the load power supply, and at the same time adjusts the degree of power supply participation of the external power supply unit accordingly, so that the power supply status continues to evolve during the abnormal phase.

[0016] Preferably, as the external power supply is gradually restored, the control device gradually increases the power supply participation of the external power supply unit based on the power supply status correlation results, and guides the energy storage unit to gradually reduce the power supply participation, so that the power supply status transitions smoothly during the recovery phase.

[0017] Preferably, the above control method enables the uninterruptible power supply to maintain the continuity and stability of load output in different operating stages, such as normal external power supply, abnormal external power supply, and restoration of external power supply.

[0018] An uninterruptible power supply (UPS) and a control device for controlling the UPS are disclosed. The control device includes a status acquisition unit, an information processing unit, a control decision unit, and an execution interface unit. The status acquisition unit is used to acquire the operating status information of an external power supply unit, an energy storage unit, and a load output unit. The information processing unit is used to perform correlation processing on the operating status information to form a power supply status correlation result. The control decision unit is used to generate a progressive power supply control strategy based on the power supply status correlation result. The execution interface unit is used to convert the power supply control strategy into control commands for the power conversion unit, thereby realizing the coordinated power supply control of the UPS system.

[0019] This invention provides an uninterruptible power supply, a method for controlling an uninterruptible power supply, and a control device, which have the following beneficial effects: (1) During system operation, the power supply continuity status, power supply stability changes, energy storage unit availability status information, and load output unit operation demand information of the external power supply unit are continuously acquired during the operation of the uninterruptible power supply system. The above-mentioned multiple operating states are comprehensively analyzed to construct the power supply status correlation results, which are used to guide the power supply control process. The power supply control no longer relies on a single state change or simple switching logic, but is based on the relationship between multiple operating states for judgment and adjustment. By identifying the current power supply stage and determining the evolution direction of the power supply status according to the power supply status correlation results, the participation degree of different power supply paths is gradually adjusted without triggering a sudden change in the power supply mode. This allows the external power supply unit and the energy storage unit to participate in the load power supply in a progressive manner, thereby effectively maintaining the continuity and stability of the load output during the power supply status change process, reducing the impact of power supply anomalies and power supply recovery stages on the load, and improving the adaptability and overall operational reliability of the uninterruptible power supply in the complex smart grid environment.

[0020] (2) This invention constructs a correlation judgment mechanism between power supply states by comprehensively sensing the external power supply state, energy storage state and load operation requirements. This makes the power supply control of the uninterruptible power supply no longer dependent on a single operating state or fixed switching conditions, but based on the comprehensive relationship between multiple states. This effectively avoids the problem of frequent power supply mode changes due to local state fluctuations, and improves the stability and continuity of the power supply control process.

[0021] (3) By introducing a progressive power supply control method, the present invention gradually adjusts the participation relationship between the external power supply unit and the energy storage unit in the power supply process, so that the power supply state can smoothly evolve between different operating stages, reducing the impact on the load during the power supply state change process, and effectively improving the power supply fluctuation problem that traditional uninterruptible power supplies are prone to during power supply anomalies and power supply recovery stages.

[0022] (4) In the power supply control process, the present invention incorporates the load operation requirements into the control logic. By adjusting the evolution mode of the power supply state according to the load’s sensitivity to the continuity and stability of power supply, the power supply control is better matched with the actual load operation characteristics, thereby improving the uninterruptible power supply’s adaptability to complex power supply state changes and overall operational reliability in the smart grid environment. Attached Figure Description

[0023] Figure 1 This is a structural framework diagram of an uninterruptible power supply and a method for controlling an uninterruptible power supply according to the present invention. Figure 2 This is a flowchart of an uninterruptible power supply and a method for controlling an uninterruptible power supply according to the present invention.

[0024] Figure 3This is a functional block diagram of an uninterruptible power supply and a control device for controlling an uninterruptible power supply according to the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1 This invention provides an uninterruptible power supply, a method for controlling the uninterruptible power supply, and a control device. Please refer to [link / reference]. Figure 1 This includes the following steps: During the operation of the uninterruptible power supply system, the control device continuously acquires the power supply continuity status and power supply stability changes of the external power supply unit, as well as the availability status information of the energy storage unit and the operating requirements information of the load output unit. Based on the acquired multi-type operating status information, the interrelationships between external power supply status, energy storage status and load operating status are comprehensively analyzed to construct a power supply status association result that characterizes the overall features of the current power supply conditions. Based on the power supply status association results, the current power supply stage is identified, and the evolution direction of the power supply status in subsequent operation is determined. Without triggering a sudden change in power supply mode, the power conversion unit is controlled to gradually adjust the participation level of different power supply paths, so that the external power supply unit and the energy storage unit participate in the load power supply in a progressive manner. Throughout the entire process of changes in power supply status, the continuity and stability of load output are maintained by continuously adjusting the participation relationship of power supply path, thereby realizing continuous power supply control of uninterruptible power supply in complex power grid environment.

[0027] This embodiment provides an overall structure for an uninterruptible power supply (UPS) system, used to achieve continuous power supply control in a smart grid environment. The system includes an external power supply unit, an energy storage unit, a power conversion unit, a load output unit, and a control device. These units are organically coordinated through power and information channels.

[0028] The external power supply unit is used to connect to the mains power or other public power grid. Its output status may be affected by changes in the grid's operating status, manifesting as voltage fluctuations, power supply intermittent periods, or phased interruptions. The energy storage unit provides backup power when the external power supply is unstable or interrupted. Its operating status is closely related to the external power supply status and load demand. The power conversion unit is located between the external power supply unit, the energy storage unit, and the load output unit, and is used to regulate the energy transfer relationship between different power supply paths.

[0029] The control device communicates with the external power supply unit, energy storage unit, power conversion unit, and load output unit via information channels to obtain the operating status information of each unit and issue control commands to the power conversion unit. In this embodiment, the control device does not regard the external power supply or energy storage as an absolute primary or absolute backup power supply, but dynamically adjusts the participation mode of each power supply unit in the power supply process based on the power supply status correlation results.

[0030] Through the above system structure, this embodiment can guide the power supply status to evolve gradually according to a predetermined logic when the external power supply status changes, rather than causing a sudden change, thereby providing a hardware foundation for the implementation of subsequent methods.

[0031] Example 2 This embodiment is an explanation based on Embodiment 1. Please refer to it. Figure 2 Specifically, this embodiment provides a method flow for controlling an uninterruptible power supply (UPS), illustrating how progressive power supply control is achieved based on power supply status correlation results during actual operation. After system startup, the method enters an initialization phase, where the control device confirms the initial operating status of each unit to ensure the system is in a controllable state.

[0032] The system then enters the power supply status sensing phase, where the control device continuously acquires information on the power supply continuity and stability changes of the external power supply unit, as well as the availability of the energy storage unit and the operational requirements of the load output unit. In this phase, the control device does not immediately respond to a single status change, but rather comprehensively senses multiple statuses.

[0033] During the state correlation judgment phase, the control device constructs a power supply state correlation result based on the aforementioned sensing results. This result reflects the comprehensive relationship between external power supply, energy storage, and load operating requirements. This correlation result is used to determine the current power supply stage and its potential development trend, rather than simply to determine whether a power supply mode switch is necessary.

[0034] In the progressive power supply control phase, the control device gradually adjusts the energy transmission path of the power conversion unit based on the power supply status correlation results, enabling a smooth transition between different power supply states. Through the above process, this embodiment achieves continuous evolution control of the power supply status.

[0035] Example 3 This embodiment is an explanation based on Embodiment 1. Please refer to it. Figure 1 Specifically, the control device provided in this embodiment is used to execute the aforementioned method for controlling an uninterruptible power supply. The control device includes a status acquisition unit, an information processing unit, a control decision unit, and an execution interface unit, and each unit works collaboratively according to its function.

[0036] The status acquisition unit is used to acquire operating status information of the external power supply unit, energy storage unit, and load output unit. This information includes, but is not limited to, power supply continuity indication information, operating status change trend information, and load operation demand information. The information processing unit is used to organize the acquired status information and form correlation information that reflects the relationships between multiple statuses.

[0037] The control decision unit generates a power supply control strategy based on associated information and dynamically adjusts the control strategy according to changes in the power supply stage. In this embodiment, the control strategy generated by the control decision unit guides the power conversion unit to gradually change the power supply path participation mode, rather than directly triggering a power supply mode switch.

[0038] The execution interface unit sends the control commands generated by the control decision unit to the power conversion unit, causing the power conversion unit to perform corresponding adjustment actions according to the control commands. Through the above structural configuration, this embodiment can effectively support the implementation of the power supply state correlation and progressive control method.

[0039] Example 4 This embodiment is an explanation based on Embodiment 1. Please refer to it. Figure 1 Specifically, in this embodiment, if an abnormal power supply occurs in the external power supply unit, this abnormality may manifest as power fluctuations, power instability, or power interruption. After the control device detects a change in the continuity of the external power supply during the power supply status sensing phase, it does not immediately trigger a complete switch of the power supply mode.

[0040] The control device first determines the nature of the abnormal power supply phase based on the power supply status correlation results, such as whether there is a possibility of external power supply recovery, whether the energy storage unit has the conditions to participate in power supply, and the sensitivity of the load to power supply changes. Based on this, the control device guides the energy storage unit to gradually participate in load power supply, while coordinating and controlling the power conversion unit.

[0041] During abnormal power supply phases, the external power supply unit and the energy storage unit can simultaneously participate in power supply, with the power supply relationship gradually adjusted according to changes in the external power supply status. Through the above control method, the load output remains continuous as the external power supply gradually fails, thereby avoiding the impact of sudden power outages on the load.

[0042] Example 5 An uninterruptible power supply and a control device for controlling the uninterruptible power supply, please refer to Figure 3 Specifically, in this embodiment, the external power supply unit gradually recovers from an abnormal state to a normal power supply state. After detecting an improvement in the external power supply state, the control device does not immediately terminate the power supply participation of the energy storage unit, but rather performs progressive control on the power supply recovery process based on the power supply state correlation results.

[0043] In the initial stage of power restoration, external power supply units gradually participate in power supply to the load, while energy storage units maintain a certain level of power supply participation to buffer the state changes during the power restoration process. As the continuity and stability of external power supply gradually increase, the control device guides the power supply state to gradually evolve into a power supply mode that is mainly based on external power supply and supplemented by energy storage.

[0044] Through the aforementioned progressive recovery control, this embodiment can effectively avoid the impact on the load caused by sudden changes in power supply status during the power supply recovery process, thereby improving the operational reliability of the uninterruptible power supply in the smart grid environment.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An uninterruptible power supply and a method for controlling an uninterruptible power supply, characterized in that: A control method for an uninterruptible power supply (UPS) is applied to an UPS system in a smart grid environment. The UPS system includes at least an external power supply unit, an energy storage unit, a power conversion unit, a load output unit, and a control device. Includes the following steps: During the operation of the uninterruptible power supply system, the control device continuously acquires the power supply continuity status and power supply stability changes of the external power supply unit, as well as the availability status information of the energy storage unit and the operating requirements information of the load output unit. Based on the acquired multi-type operating status information, the interrelationships between external power supply status, energy storage status and load operating status are comprehensively analyzed to construct a power supply status association result that characterizes the overall features of the current power supply conditions. Based on the power supply status association results, the current power supply stage is identified, and the evolution direction of the power supply status in subsequent operation is determined. Without triggering a sudden change in power supply mode, the power conversion unit is controlled to gradually adjust the participation level of different power supply paths, so that the external power supply unit and the energy storage unit participate in the load power supply in a progressive manner. Throughout the entire process of changes in power supply status, the continuity and stability of load output are maintained by continuously adjusting the participation relationship of power supply path, thereby realizing continuous power supply control of uninterruptible power supply in complex power grid environment.

2. The uninterruptible power supply and the method for controlling the uninterruptible power supply according to claim 1, characterized in that: The power supply continuity status includes the power supply status of the external power supply unit within a predetermined operating cycle and status information reflecting the risk of power outage. The power supply stability change status includes the trend characteristics of the external power supply status changing over time. Based on the above information, the control device determines that the external power supply is currently in any of the following stages: continuous power supply stage, fluctuating power supply stage, or abnormal power supply stage.

3. The uninterruptible power supply and the method for controlling the uninterruptible power supply according to claim 1, characterized in that: The process of constructing the power supply status association result includes: performing unified association processing on the operating status information of the external power supply unit, the available status information of the energy storage unit, and the operating demand information of the load output unit to form a comprehensive judgment result that can reflect the mutual constraints between multiple power supply conditions. The power supply status association result is used to guide the progressive adjustment behavior in the subsequent power supply control process.

4. The uninterruptible power supply and the method for controlling the uninterruptible power supply according to claim 1, characterized in that: When identifying the current power supply stage based on the power supply status correlation results, the control device does not use a single operating state as the basis for judgment, but rather judges whether the power supply status has the conditions for evolution based on the changing relationship between multiple types of status information, so as to avoid frequent adjustments to the power supply control strategy due to short-term fluctuations in local status.

5. The uninterruptible power supply and the method for controlling the uninterruptible power supply according to claim 1, characterized in that: The progressive approach includes: when a change in the external power supply status is detected, gradually guiding the energy storage unit to participate in load power supply, while adjusting the degree of power supply participation of the external power supply unit accordingly, so that the power supply structure transitions in a continuous evolution manner between different power supply stages.

6. The uninterruptible power supply and the method for controlling the uninterruptible power supply according to claim 5, characterized in that: During abnormal power supply phases, the external power supply unit and the energy storage unit simultaneously participate in load power supply according to a preset progressive control strategy. The progressive control strategy is used to limit the range of changes in the power supply path participation relationship to avoid adverse effects on load operation caused by sudden changes in power supply status.

7. The uninterruptible power supply and the method for controlling the uninterruptible power supply according to claim 1, characterized in that: During the power restoration phase, the control device gradually increases the power participation level of the external power supply unit based on the power supply status correlation results, and guides the energy storage unit to gradually reduce the power participation level until it exits the power supply process after the external power supply stability reaches the expected state.

8. The uninterruptible power supply and the method for controlling the uninterruptible power supply according to claim 1, characterized in that: The load operation demand information includes state information reflecting the load's sensitivity to power supply continuity. When generating a power supply control strategy, the control device uses the load operation demand information as a constraint to adjust the evolution of the power supply state.

9. The uninterruptible power supply and the method for controlling the uninterruptible power supply according to claim 1, characterized in that: The method is applicable to multi-power source collaborative power supply scenarios in smart grid environments. The control device dynamically adjusts the construction method and judgment logic of power supply status correlation results according to changes in grid operation characteristics, so as to improve the adaptability of uninterruptible power supply to grid fluctuations.

10. An uninterruptible power supply control device, applied in an uninterruptible power supply system, characterized in that, include: The status acquisition unit is used to acquire the operating status information of the external power supply unit, energy storage unit, and load output unit; An information processing unit is used to perform correlation processing on the operating status information to form a power supply status correlation result; A control decision unit is used to generate a progressive power supply control strategy based on the power supply status correlation results; The execution interface unit is used to convert the power supply control strategy into control commands for the power conversion unit, thereby realizing the coordinated power supply control of the external power supply unit and the energy storage unit.

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