Power supply terminal, power supply control method, control device, and storage medium

Abstract

The application relates to the technical field of power supply, and discloses a power supply terminal, a power supply control method, a control device and a storage medium. When the output of a commercial power unit is abnormal, the power supply terminal uses an energy unit and an energy storage unit to supply power to a load, thereby realizing uninterrupted power supply of multiple power sources. When the output of the commercial power unit is normal, if the running power of the load does not exceed a preset peak clipping power threshold, the power supply terminal uses a dynamic peak clipping mode to supply power to the load, that is, the power supply terminal uses the commercial power unit and the energy unit to supply power to the load. If the running power of the load exceeds the preset peak clipping power threshold, the power supply terminal uses a fixed peak clipping mode to supply power to the load, that is, the power supply terminal uses the commercial power unit, the energy unit and the energy storage unit to jointly supply power to the load. In the dynamic peak clipping mode and the fixed peak clipping mode, the energy unit and the energy storage unit serve as a supplement of the commercial power, realize peak clipping, improve the utilization rate of the commercial power, reduce the load of the power grid, and thus improve the power supply efficiency.

Description

Technical Field

[0001] The present invention relates to the field of power supply technology, and in particular to a power supply terminal, a power supply control method, a control device and a storage medium. Background Art

[0002] Internet data centers are complex facilities. They encompass not only computer systems and supporting equipment, but also a variety of infrastructure systems, including power distribution, cooling, fire protection, and monitoring. The cooling system is a major energy consumer in data centers, accounting for approximately 30-45% of the total energy consumption. Currently, data center cooling systems are typically powered by an uninterruptible power supply (UPS). A UPS not only connects to the mains but also contains its own energy storage battery. Normally, the UPS provides cooling power to the data center, but in the event of a mains failure, the energy storage battery is activated to provide uninterrupted power.

[0003] Generally, higher outdoor temperatures increase cooling load power consumption, while stronger sunlight also generates more electricity from photovoltaic power generation. Higher outdoor temperatures are essentially equivalent to maximum sunlight, making photovoltaic power generation ideal for powering cooling loads. However, prior art approaches to directly integrating photovoltaic power generation with a UPS (uninterrupted power supply) present difficulties in allocating power capacity across multiple power sources, resulting in low power supply efficiency and heavy grid loads. Summary of the Invention

[0004] The present invention provides a power supply terminal, a power supply control method, a control device and a storage medium, which can realize uninterrupted power supply of multiple power sources and improve power supply efficiency.

[0005] To solve the above technical problems, the present invention adopts a technical solution: providing a power supply control method, which is applied to a power supply system that provides uninterrupted power supply to a load, characterized in that the power supply system includes a power supply terminal, a power supply connected to the power supply terminal, and a load, and the power supply includes: a mains unit, an energy unit, and an energy storage unit; the power supply control method includes:

[0006] Determining whether the output of the mains power unit is normal;

[0007] If not, controlling the energy unit and the energy storage unit to jointly supply power to the load;

[0008] If so, determining whether the operating power of the load exceeds a preset peak-shaving power threshold;

[0009] If not, start the dynamic peak shaving mode to control the mains power unit and the energy unit to jointly supply power to the load;

[0010] If so, the fixed peak shaving mode is started when the capacity value of the energy storage unit is not lower than the preset first capacity threshold, and the mains unit, the energy unit and the energy storage unit are controlled to jointly supply power to the load.

[0011] According to one embodiment of the present invention, the power supply control method includes the step of determining whether the capacity value of the energy storage unit is lower than the preset first capacity threshold:

[0012] If not, start the fixed peak shaving mode to control the mains unit, the energy unit and the energy storage unit to jointly supply power to the load;

[0013] If so, the dynamic peak shaving mode is activated to control the mains power unit and the energy unit to jointly supply power to the load.

[0014] According to one embodiment of the present invention, before determining whether the output of the mains power unit is normal, the method further includes:

[0015] Obtain the output power of the mains unit, the operating power of the load, the generated power of the energy unit, the capacity value, the charging power and the discharging power of the energy storage unit.

[0016] According to one embodiment of the present invention, starting the dynamic peak shaving mode and controlling the mains power unit and the energy unit to jointly supply power to the load includes:

[0017] Determining whether the capacity value of the energy storage unit is higher than a preset second capacity threshold;

[0018] If so, determining whether the generated power is greater than the operating power;

[0019] If the generated power is greater than the operating power, controlling the energy unit to supply power to the load, and at the same time controlling the energy unit to feed power to the mains unit;

[0020] If the generated power is less than or equal to the operating power, the energy unit and the mains power unit are controlled to jointly supply power to the load.

[0021] According to one embodiment of the present invention, after determining whether the capacity value of the energy storage unit is higher than a preset second capacity threshold, the method further includes:

[0022] If not, it is determined that the generated power is greater than the charging power;

[0023] If not, the charging power is adjusted according to the generated power, and the energy unit is controlled to charge the energy storage unit according to the charging power.

[0024] According to one embodiment of the present invention, after determining that the generated power is greater than the charging power, the method further includes:

[0025] If so, control the energy unit to charge the energy storage unit according to the charging power, calculate the difference between the generated power and the charging power, and determine whether the calculated difference is greater than the operating power;

[0026] If so, controlling the energy unit to supply power to the load, and at the same time controlling the energy unit to feed power to the mains unit;

[0027] If not, the energy unit and the mains unit are controlled to jointly supply power to the load.

[0028] According to one embodiment of the present invention, starting the fixed peak shaving mode and controlling the mains unit, the energy unit, and the energy storage unit to jointly supply power to the load includes:

[0029] Calculating a difference between the operating power and the peak clipping power threshold;

[0030] Determining whether the generated power is greater than the difference calculation result;

[0031] If not, the mains unit, the energy unit and the energy storage unit are controlled to jointly supply power to the load.

[0032] To solve the above technical problems, another technical solution adopted by the present invention is to provide a power supply control device, comprising:

[0033] A judgment module is used to judge whether the output of the mains power unit is normal;

[0034] A first execution module is configured to control the energy unit and the energy storage unit to jointly supply power to the load if no;

[0035] A second execution module is configured to, if yes, determine whether the operating power of the load exceeds a preset peak-shaving power threshold;

[0036] a third execution module, configured to, if not, start a dynamic peak shaving mode to control the mains power unit and the energy unit to jointly supply power to the load;

[0037] The fourth execution module is used to start the fixed peak shaving mode when it is determined that the capacity value of the energy storage unit is not lower than the preset first capacity threshold, and control the AC power unit, the energy unit and the energy storage unit to jointly supply power to the load.

[0038] In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a power supply terminal, comprising:

[0039] An AC bus comprising an AC input end for connecting a utility unit and an AC output end for connecting a load;

[0040] A DC bus comprising a first DC input end for connecting an energy unit, a second DC input end for connecting an energy storage unit, and a DC output end;

[0041] A bidirectional inverter comprising a DC side and an AC side, the DC side being connected to the DC output end, and the AC side being connected to the AC output end;

[0042] A first current conversion unit connected to the first DC input end;

[0043] A second current conversion unit connected to the second DC input end;

[0044] A power supply control device connected to the bidirectional inverter, the first current conversion unit and the second current conversion unit, respectively, wherein the power supply control device is used to execute the power supply control method.

[0045] To solve the above technical problems, the present application adopts another technical scheme: a computer storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the power supply control method.

[0046] The present application has the following advantages: when the output of the utility unit is abnormal, the energy unit and the energy storage unit are used to supply power to the load, realizing uninterrupted power supply of multiple power sources; when the output of the utility unit is normal, if the running power of the load does not exceed the preset peak clipping power threshold, a dynamic peak clipping mode is used to supply power to the load, i.e., the utility unit and the energy unit are used to supply power to the load; if the running power of the load exceeds the preset peak clipping power threshold, a fixed peak clipping mode is used to supply power to the load, i.e., the utility unit, the energy unit and the energy storage unit are used to supply power to the load; in the dynamic peak clipping mode and the fixed peak clipping mode, the energy unit and the energy storage unit are used as a supplement to the utility unit, realizing peak clipping, improving the utilization rate of the utility unit, reducing the load of the power grid, and thus improving the power supply efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a structural schematic diagram of a power supply system of an embodiment of the present application;

[0048] Figure 2 is a structural schematic diagram of a power supply terminal of an embodiment of the present application;

[0049] Figure 3 is a structural schematic diagram of a power supply terminal of another embodiment of the present application;

[0050] Figure 4 is a flowchart of a power supply control method according to an embodiment of the present application;

[0051] Figure 5 is a flowchart of a power supply control method according to another embodiment of the present application;

[0052] Figure 6 is a flowchart of a power supply control method according to yet another embodiment of the present application;

[0053] Figure 7 is a flowchart of a dynamic peak clipping mode according to an embodiment of the present application;

[0054] Figure 8 is a flowchart of a fixed peak clipping mode according to an embodiment of the present application;

[0055] Figure 9 is an effect curve diagram of a dynamic peak clipping mode according to an embodiment of the present application, wherein Fig. a is a running power curve diagram of a load, Fig. b is a power generation power curve diagram of an energy unit, and Fig. c is an output power curve diagram of a commercial power unit;

[0056] Figure 10 is an effect curve diagram of a fixed peak clipping mode according to an embodiment of the present application;

[0057] Figure 11 is a structural diagram of a power supply control device according to an embodiment of the present application;

[0058] Figure 12 is a structural diagram of a computer storage medium according to an embodiment of the present application. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0060] The terms "first", "second" and "third" in the present invention are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second" and "third" may explicitly or implicitly include at least one of such features. In the description of the present invention, "multiple" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0061] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0062] Figure 1 This is a power supply system according to an embodiment of the present invention. Figure 1 The power supply system 100 includes a power supply terminal 200 , a power supply 101 connected to the power supply terminal 200 , and a load 102 . The power supply 101 includes a mains unit 1011 , an energy unit 1012 , and an energy storage unit 1013 .

[0063] Specifically, the operating power of the load 102 of this embodiment can change according to changes in time and application environment. For example, the operating power of the refrigeration equipment load is relatively low in spring, autumn or winter due to the low outdoor temperature, and is relatively high in summer due to the high outdoor temperature.

[0064] The energy unit 1012 can be thermal energy, wind energy, electrical energy, light energy, etc., preferably a photovoltaic unit.

[0065] The energy storage unit 1013 may be an energy storage battery, and the number of the energy storage battery may be one or more, and the specific number is not limited here. The capacity of the energy storage unit 1013 may be configured according to the actual application environment.

[0066] The mains unit 1011 is a power grid that can provide alternating current. In one embodiment, the mains unit 1011 is connected to the power supply terminal 200 via a transformer.

[0067] Figure 2 This is a power supply terminal according to an embodiment of the present invention. Figure 2 The power supply terminal 200 includes an AC bus 10, a DC bus 20, a switch unit 30, a bidirectional inverter 40, a first converter unit 50, a second converter unit 60 and a power supply control device 70.

[0068] Among them, the AC bus 10 includes an AC input end for connecting the mains unit 1011 and an AC output end for connecting the load 102; the DC bus 20 includes a first DC input end for connecting the energy unit 1012 and a second DC input end and a DC output end for connecting the energy storage unit 1013; the switch unit 30 is arranged between the AC input end and the AC output end, and is used to control the on and off between the AC input end and the AC output end; the bidirectional inverter 40 includes a DC side and an AC side, the DC side is connected to the DC output end, and the AC side is connected to the AC output end; the first converter unit 50 is connected to the first DC input end; the second converter unit 60 is connected to the second DC input end; the power supply control device 70 is respectively connected to the switch unit 30, the bidirectional inverter 40, the first converter unit 50 and the second converter unit 60.

[0069] In one feasible embodiment, the switch unit 30 is a static switch (thyristor), a contactless switch composed of two thyristors connected in reverse parallel to form an AC switch, whose closing and opening are controlled by the power supply control device 70. This embodiment uses a static switch as the control switch for the AC input, which can reduce equipment costs. Generally, the load 102 is directly supplied by the mains. When the mains is directly supplied, the bidirectional inverter 40 can act as an active filter to reduce harmonics and compensate for reactive power. Compared with the double conversion of traditional UPS, it can increase system efficiency to over 99%, while also solving the harmonics generated by the load inverter.

[0070] In an achievable embodiment, the power supply control device 70 may be a controller, such as a single chip microcomputer or a PLC. Figure 4-6 .

[0071] In one feasible embodiment, the first converter unit 50 may be a DC / DC converter, which is provided corresponding to the energy unit 1012. The energy unit 1012 is connected to the first DC input terminal via the first converter unit 50. The first converter unit 50 converts the DC voltage generated by the energy unit 1012, which fluctuates within a certain range, into a stable output DC voltage through a voltage boosting effect.

[0072] In one feasible embodiment, the second converter unit 60 may be a bidirectional DC / DC converter, provided in correspondence with the energy storage unit 1013. The energy storage unit 1013 is connected to the second DC input terminal via the second converter unit 60. The function of the second converter unit 60 is to implement bidirectional DC voltage conversion, voltage stabilization, and charge-discharge conversion. If the energy storage unit 1013 includes multiple energy storage batteries, the number of bidirectional DC / DC converters included in the second converter unit 60 is the same as the number of energy storage batteries.

[0073] Figure 3 This is another embodiment of the power supply terminal of the present invention, see Figure 3 The power supply terminal 200 includes an AC bus 10, a DC bus 20, a switch unit 30, a rectifier unit 80, a bidirectional inverter 40, a first converter unit 50, a second converter unit 60 and a power supply control device 70.

[0074] Among them, the AC bus 10 includes an AC input end for connecting to the mains unit 1011 and an AC output end for connecting to the load 102; the DC bus 20 includes a first DC input end for connecting to the energy unit 1012 and a second DC input end and a DC output end for connecting to the energy storage unit 1013; the switch unit 30 is provided between the AC input end and the AC output end, and is used to control the on-off between the AC input end and the AC output end; the rectifier unit 80 includes a DC side and an AC side, and the bidirectional inverter 40 includes a DC side and an AC side. The AC side of the rectifier unit 80 is connected to the AC input end, the DC side of the rectifier unit 80 is connected to the DC side of the bidirectional inverter 40, the AC side of the bidirectional inverter 40 is connected to the AC output end, and the DC side of the bidirectional inverter 40 is also connected to the DC output end; the first converter unit 50 is connected to the first DC input end; the second converter unit 60 is connected to the second DC input end; the power supply control device 70 is respectively connected to the switch unit 30, the bidirectional inverter 40, the rectifier unit 80, the first converter unit 50 and the second converter unit 60.

[0075] The rectifier unit 80 can limit the input current when in the dynamic peak clipping mode or the fixed peak clipping mode. Figure 4-8 .

[0076] Figure 4 It is a flow chart of a power supply control method according to an embodiment of the present invention. It should be noted that the method of the present invention is not limited to the method of FIG. Figure 4 The process sequence shown is limited. Figure 4 As shown, the method includes:

[0077] Step S401: Determine whether the output of the AC power unit is normal.

[0078] In step S401, an abnormality in the mains power unit may affect the output power, voltage, or current of the mains power unit. This embodiment can determine whether the output of the mains power unit is normal based on the output power, voltage, or current. Abnormal conditions of the mains power unit include, but are not limited to, power surges, high voltage breakthroughs, transient overvoltages, voltage sags, low voltages, mains power outages, noise interference, etc.

[0079] In one embodiment of the present invention, see Figure 5 , before step S401, further comprising:

[0080] Step S400: Obtain the output power of the mains unit, the operating power of the load, the generated power of the energy unit, the capacity value of the energy storage unit, the charging power, and the discharging power.

[0081] In step S400, the operating power of the load may vary according to time and application environment. For example, in the case of a refrigeration equipment load, the operating power of the load may be relatively low in spring, autumn, or winter due to low outdoor temperatures, and relatively high in summer due to high outdoor temperatures. The energy unit may be thermal energy, wind energy, electrical energy, light energy, etc., preferably a photovoltaic unit. The energy storage unit may be an energy storage battery, and the capacity value, i.e., the SOC (State of Charge) value, refers to the state of charge of the energy storage unit, and may represent the remaining capacity of the energy storage unit, i.e., the ratio of the remaining capacity after a period of use or long-term non-use to the capacity in its fully charged state.

[0082] Step S402: If not, control the energy unit and the energy storage unit to jointly supply power to the load.

[0083] In step S402, if the output of the mains power unit is abnormal, the switch unit is controlled to disconnect, and the energy unit and the energy storage unit are controlled to jointly supply power to the load. Generally, the voltage output by the energy unit to the DC bus is slightly higher than the voltage output by the energy storage unit to the DC bus. Specifically, the operating power and the generated power are compared. If the operating power is less than the generated power, the energy unit is controlled to supply power to the load. If the energy storage unit is not fully charged, the energy unit is controlled to charge the energy storage unit according to the charging power, or the energy unit adjusts the output voltage and power through the first converter unit to dynamically match the power required by the load. If the generated power is less than the operating power, the energy unit and the energy storage unit are controlled to jointly supply power to the load, and the discharge power of the energy storage unit is the difference between the generated power and the operating power.

[0084] In this embodiment, when the output of the mains power unit is abnormal, the energy unit and the energy storage unit are controlled to supply power to the load, thereby achieving uninterrupted power supply.

[0085] Step S403: If yes, it is judged whether the running power of the load exceeds the preset peak clipping power threshold.

[0086] In step S403, if the output of the mains unit is normal, the switch unit is turned on, and the running power is compared with the preset peak clipping power threshold. The optimal peak clipping mode (dynamic peak clipping mode, fixed peak clipping mode) is selected according to the comparison result to realize power supply to the load, so as to improve the power supply efficiency and reduce the grid load. The preset peak clipping power threshold is the maximum output power of the mains unit.

[0087] Step S404: If no, the dynamic peak clipping mode is started, and the mains unit and the energy unit jointly supply power to the load.

[0088] In step S404, if the running power of the load is less than or equal to the preset peak clipping power threshold, the dynamic peak clipping mode is started. The dynamic peak clipping mode controls the mains unit and the energy unit to supply power to the load. The effect curve of the dynamic peak clipping mode is shown in FIG. 2b. Figure 9 (wherein, FIG. a is a running power curve of the load, FIG. b is a power generation curve of the energy unit, and FIG. c is an output power curve of the mains unit). In this embodiment, the energy unit is used as a supplement of the mains unit to realize dynamic peak clipping, so as to fully utilize the mains, improve the utilization rate of the mains, and reduce the load of the grid.

[0089] Step S405: If yes, the fixed peak clipping mode is started when the capacity value of the energy storage unit is not lower than the preset first capacity threshold, and the mains unit, the energy unit and the energy storage unit jointly supply power to the load.

[0090] In step S405, because the capacity value of the energy storage unit is too low and cannot be discharged, it is required that the capacity value of the energy storage unit cannot be too low. The preset first capacity threshold is the minimum capacity value that meets the discharge of the energy storage unit to the load when the mains unit fails.

[0091] When the running power of the load is greater than the preset peak clipping power threshold, if the capacity value is greater than or equal to the preset first capacity threshold, it indicates that the energy storage unit can supply power to the load, and the mains unit, the energy unit and the energy storage unit jointly supply power to the load. The effect curve of the fixed peak clipping mode is shown in FIG. 2c. Figure 10 In this embodiment, the mains unit, the energy unit and the energy storage unit jointly supply power to realize fixed peak clipping, so as to fully utilize the mains, improve the utilization rate of the mains, and reduce the load of the grid.

[0092] In an implementable embodiment, please refer to FIG. 3. Figure 6 When the running power of the load exceeds the preset peak clipping power threshold, the power supply control method further includes:

[0093] Step S406: Determine whether the capacity value of the energy storage unit is lower than a preset first capacity threshold.

[0094] In this step, if the capacity value of the energy storage unit is greater than or equal to the preset first capacity threshold, step S407 is executed; if the capacity value of the energy storage unit is less than the preset first capacity threshold, step S408 is executed.

[0095] Step S407: If not, start the fixed peak shaving mode to control the mains unit, the energy unit and the energy storage unit to jointly supply power to the load.

[0096] In step S407, if the capacity value of the energy storage unit is greater than or equal to the preset first capacity threshold, it means that the energy storage unit can supply power to the load, and the AC power unit, energy unit and energy storage unit are controlled to jointly supply power to the load.

[0097] Step S408: If yes, the dynamic peak shaving mode is started to control the mains unit and the energy unit to jointly supply power to the load.

[0098] In step S408, if the capacity value of the energy storage unit is less than the preset first capacity threshold, it means that the energy storage unit is not supplying power and the dynamic peak shaving mode needs to be activated. This step is similar to step S404.

[0099] In one possible embodiment, see Figure 7 , step S404 further includes the following steps:

[0100] Step S701: Determine whether the capacity value of the energy storage unit is higher than a preset second capacity threshold.

[0101] Specifically, the preset second capacity threshold is the capacity value of the energy storage unit in a fully charged state. The capacity value of the energy storage unit is compared with the second capacity threshold to determine whether the capacity value of the energy storage unit is higher than the second capacity threshold. If so, the energy storage unit does not need to be charged in subsequent steps. If not, the energy storage unit is allowed to be charged in subsequent steps.

[0102] Step S702: If yes, determine whether the generated power is greater than the operating power.

[0103] Specifically, if the capacity value of the energy storage unit is greater than the second capacity threshold, it indicates that the energy storage unit is fully charged. The generated power is compared with the operating power, and based on the comparison result, it can be determined whether the mains unit is needed to supply power to the load.

[0104] Step S703: If the generated power is greater than the operating power, the energy unit is controlled to supply power to the load, and at the same time, the energy unit is controlled to feed power to the mains unit.

[0105] Specifically, if the generated power is greater than the operating power, it means that the power of the energy unit is sufficient to supply power to the load, and there is still surplus power to feed the mains unit, where the feed power is the difference between the generated power and the operating power.

[0106] Step S704: If the generated power is less than or equal to the operating power, the energy unit and the mains unit are controlled to jointly supply power to the load.

[0107] Specifically, if the generated power is less than or equal to the operating power, it means that the energy unit is short of power and needs to be combined with the mains unit to supply power to the load. The output power of the mains unit is the difference between the operating power and the generated power.

[0108] Further, see Figure 7 After step S701, the following steps are further included:

[0109] Step S705: If not, it is determined that the generated power is greater than the charging power.

[0110] Specifically, if the capacity value of the energy storage unit is less than or equal to the second capacity threshold, it means that the energy storage unit is not fully charged. The generated power is compared with the charging power, and based on the comparison result, it can be determined whether the energy unit can charge the energy storage unit.

[0111] Step S706: If not, adjust the charging power according to the generated power, and control the energy unit to charge the energy storage unit according to the charging power.

[0112] Specifically, because the first converter unit connected to the energy unit and the second converter unit connected to the energy storage unit are both on the same DC bus, after obtaining the generated power, the input voltage of the second converter unit can be adjusted to be lower than the output voltage of the first converter unit, and at the same time, the DC side voltage of the bidirectional inverter is increased, resulting in a lower voltage of the second converter unit. The energy unit charges the energy storage unit, and at the same time, the output voltage and current of the second converter unit are adjusted to control the energy unit to charge the energy storage unit according to the charging power.

[0113] Further, see Figure 7 After step S705, the following steps are further included:

[0114] Step S707: If yes, the energy unit is controlled to charge the energy storage unit according to the charging power, and the difference between the generated power and the charging power is calculated to determine whether the calculated difference is greater than the operating power.

[0115] Specifically, the DC side input voltage of the bidirectional inverter is adjusted according to the generated power and the charging power, so that the DC side input voltage is higher than the input voltage of the second conversion unit and lower than the output voltage of the first conversion unit, so as to realize that the energy unit preferentially charges the energy storage unit, and the remaining power is output to the AC bus through the bidirectional inverter to supply power to the load. By calculating the difference between the generated power and the charging power, the difference calculation result is compared with the operating power, and according to the comparison result, it can be judged whether the remaining power after the energy unit preferentially charges the energy storage unit is sufficient to supply power to the load.

[0116] Step S708: If yes, the energy unit is controlled to supply power to the load, and the energy unit is controlled to feed power to the utility unit.

[0117] Specifically, if the difference calculation result is greater than the operating power, it indicates that the remaining power after the energy unit preferentially charges the energy storage unit is sufficient to supply power to the load, and there is no need to jointly supply power to the load with the utility unit, and even the energy unit can feed power. The feeding power is the difference between the generated power and the charging power and the operating power.

[0118] Step S709: If no, the energy unit and the utility unit jointly supply power to the load.

[0119] Specifically, if the difference calculation result is less than or equal to the operating power, it indicates that the remaining power after the energy unit preferentially charges the energy storage unit is insufficient to supply power to the load, and the utility unit needs to jointly supply power to the load. At this time, the remaining power after the energy unit preferentially charges the energy storage unit, that is, the output power of the bidirectional inverter, is the difference between the generated power and the charging power, and the output power of the utility unit is the difference between the operating power of the load and the output power of the bidirectional inverter.

[0120] In an implementable embodiment, please refer to Figure 8 , step S406 further includes the following steps:

[0121] Step S801: calculating the difference between the operating power and the peak clipping power threshold;

[0122] Step S802: judging whether the generated power is greater than the difference calculation result;

[0123] Step S803: if no, the utility unit, the energy unit and the energy storage unit jointly supply power to the load.

[0124] Specifically, the output power of the utility unit is the peak clipping power threshold, and the discharging power of the energy storage unit is the difference between the operating power and the output power of the utility unit and the generated power of the energy unit.

[0125] In another implementable embodiment, please refer to Figure 8 , after step S802, further includes:

[0126] Step S804: If yes, the energy unit and the mains unit are controlled to jointly supply power to the load.

[0127] Specifically, the output power of the mains unit is the difference between the operating power and the generated power.

[0128] The power supply control method of the embodiment of the present invention realizes uninterrupted power supply from multiple power sources by utilizing the energy unit and the energy storage unit to power the load when the output of the mains unit is abnormal. When the output of the mains unit is normal, if the operating power of the load does not reach the preset peak-shaving power threshold, the dynamic peak-shaving mode is adopted to power the load, that is, the mains unit and the energy unit are used to power the load. If the operating power of the load reaches the preset peak-shaving power threshold, the fixed peak-shaving mode is adopted to power the load, that is, the mains unit, the energy unit and the energy storage unit are used to jointly power the load. In the dynamic peak-shaving mode and the fixed peak-shaving mode, the energy unit and the energy storage unit serve as a supplement to the mains to achieve peak shaving, improve the utilization rate of the mains, reduce the grid load, and thus improve the power supply efficiency.

[0129] Figure 11 FIG is a schematic diagram of the structure of the power supply control device according to an embodiment of the present invention. Figure 11 As shown, the device 110 includes a judgment module 111 , a first execution module 112 , a second execution module 113 , a third execution module 114 and a fourth execution module 115 .

[0130] The judging module 111 is used to judge whether the output of the mains power unit is normal;

[0131] The first execution module 112 is configured to control the energy unit and the energy storage unit to jointly supply power to the load if no;

[0132] The second execution module 113 is configured to determine whether the operating power of the load exceeds a preset peak-shaving power threshold if yes;

[0133] The third execution module 114 is configured to, if not, start the dynamic peak shaving mode to control the mains unit and the energy unit to jointly supply power to the load;

[0134] The fourth execution module 115 is configured to start the fixed peak shaving mode when the capacity value of the energy storage unit is not lower than the preset first capacity threshold, and control the mains unit, the energy unit and the energy storage unit to jointly supply power to the load.

[0135] In one embodiment, the fourth execution module 115 is further configured to determine whether the capacity value of the energy storage unit is lower than a preset first capacity threshold if yes;

[0136] If not, the fixed peak shaving mode is activated to control the mains unit, energy unit and energy storage unit to jointly supply power to the load;

[0137] If so, the dynamic peak shaving mode is activated to control the mains unit and the energy unit to jointly supply power to the load.

[0138] In another embodiment, the device 110 also includes an acquisition module for obtaining the output power of the AC power unit, the operating power of the load, the generated power of the energy unit, the capacity value of the energy storage unit, the charging power and the discharging power before determining whether the output of the AC power unit is normal.

[0139] Specifically, starting the dynamic peak shaving mode and controlling the mains unit and the energy unit to jointly supply power to the load includes:

[0140] Determining whether the capacity value of the energy storage unit is higher than a preset second capacity threshold;

[0141] If so, determine whether the generated power is greater than the operating power;

[0142] If the generated power is greater than the operating power, the energy unit is controlled to supply power to the load, and at the same time, the energy unit is controlled to feed power to the mains unit;

[0143] If the generated power is less than or equal to the operating power, the energy unit and the mains unit are controlled to jointly supply power to the load.

[0144] Furthermore, after determining whether the capacity value of the energy storage unit is higher than a preset second capacity threshold, the method further includes:

[0145] If not, it is determined that the power generation is greater than the charging power;

[0146] If not, the charging power is adjusted according to the generated power, and the energy unit is controlled to charge the energy storage unit according to the charging power.

[0147] Furthermore, after determining that the generated power is greater than the charging power, the method further includes:

[0148] If so, the energy unit is controlled to charge the energy storage unit according to the charging power, and the difference between the generated power and the charging power is calculated to determine whether the calculated difference is greater than the operating power;

[0149] If so, controlling the energy unit to supply power to the load and simultaneously controlling the energy unit to feed power to the mains unit;

[0150] If not, the energy unit and the mains unit are controlled to jointly supply power to the load.

[0151] Specifically, starting the fixed peak shaving mode and controlling the mains unit, energy unit, and energy storage unit to jointly supply power to the load includes:

[0152] Calculate the difference between the operating power and the peak power threshold;

[0153] Determine whether the generated power is greater than the difference calculation result;

[0154] If not, the mains unit, energy unit and energy storage unit are controlled to jointly supply power to the load.

[0155] See Figure 12 , Figure 12 Schematic diagram of the structure of the computer storage medium of the embodiment of the present invention. The computer storage medium of the embodiment of the present invention stores a program file 120 that can implement all the above methods, wherein the program file 120 can be stored in the above computer storage medium in the form of a software product, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned computer storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or terminal devices such as a computer, a server, a mobile phone, and a tablet.

[0156] In the several embodiments provided by the present invention, 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 units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0157] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0158] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A power supply control method, applied to a power supply system for providing uninterrupted power to a load, characterized in that: The power supply system includes a power supply terminal, a power supply connected to the power supply terminal, and a load, wherein the power supply includes: a mains unit, an energy unit, and an energy storage unit; the power supply control method includes: Determining whether the output of the mains power unit is normal; If not, controlling the energy unit and the energy storage unit to jointly supply power to the load; If so, determining whether the operating power of the load exceeds a preset peak-shaving power threshold, where the preset peak-shaving power threshold is the maximum output power of the mains unit; If not, start the dynamic peak shaving mode to control the mains power unit and the energy unit to jointly supply power to the load; If so, the fixed peak shaving mode is started when the capacity value of the energy storage unit is not lower than the preset first capacity threshold, and the mains unit, the energy unit and the energy storage unit are controlled to jointly supply power to the load.

2. The power supply control method according to claim 1, wherein: The power supply control method includes the steps of determining whether the capacity value of the energy storage unit is lower than the first preset capacity threshold: If not, start the fixed peak shaving mode to control the mains unit, the energy unit and the energy storage unit to jointly supply power to the load; If so, the dynamic peak shaving mode is activated to control the mains power unit and the energy unit to jointly supply power to the load.

3. The power supply control method according to claim 2, wherein: Before determining whether the output of the mains power unit is normal, the method further includes: Obtain the output power of the mains unit, the operating power of the load, the generated power of the energy unit, the capacity value, the charging power and the discharging power of the energy storage unit.

4. The power supply control method according to claim 3, wherein: The starting of the dynamic peak shaving mode and controlling the mains unit and the energy unit to jointly supply power to the load includes: Determining whether the capacity value of the energy storage unit is higher than a preset second capacity threshold; If so, determining whether the generated power is greater than the operating power; If the generated power is greater than the operating power, controlling the energy unit to supply power to the load, and at the same time controlling the energy unit to feed power to the mains unit; If the generated power is less than or equal to the operating power, the energy unit and the mains power unit are controlled to jointly supply power to the load.

5. The power supply control method according to claim 4, wherein: After determining whether the capacity value of the energy storage unit is higher than a preset second capacity threshold, the method further includes: If not, it is determined that the generated power is greater than the charging power; If not, the charging power is adjusted according to the generated power, and the energy unit is controlled to charge the energy storage unit according to the charging power.

6. The power supply control method according to claim 5, wherein: After determining that the generated power is greater than the charging power, the method further includes: If so, control the energy unit to charge the energy storage unit according to the charging power, calculate the difference between the generated power and the charging power, and determine whether the calculated difference is greater than the operating power; If so, controlling the energy unit to supply power to the load, and at the same time controlling the energy unit to feed power to the mains unit; If not, the energy unit and the mains unit are controlled to jointly supply power to the load.

7. The power supply control method according to claim 3, wherein: The starting of the fixed peak shaving mode and controlling the mains unit, the energy unit, and the energy storage unit to jointly supply power to the load includes: Calculating a difference between the operating power and the peak clipping power threshold; Determining whether the generated power is greater than the difference calculation result; If not, the mains unit, the energy unit and the energy storage unit are controlled to jointly supply power to the load.

8. A power supply control device, characterized in that: include: A judgment module is used to judge whether the output of the mains power unit is normal; A first execution module is used for controlling the energy unit and the energy storage unit to jointly supply power to the load if no; a second execution module, configured to, if yes, determine whether the operating power of the load exceeds a preset peak-shaving power threshold, where the preset peak-shaving power threshold is the maximum output power of the mains unit; a third execution module, configured to, if not, start a dynamic peak shaving mode to control the mains power unit and the energy unit to jointly supply power to the load; The fourth execution module is used to start the fixed peak shaving mode when the capacity value of the energy storage unit is not lower than the preset first capacity threshold, and control the mains unit, the energy unit and the energy storage unit to jointly supply power to the load.

9. A power supply terminal, characterized in that: include: An AC busbar, comprising an AC input terminal for connecting to a mains power unit and an AC output terminal for connecting to a load; A DC bus, comprising a first DC input terminal for connecting to an energy unit, a second DC input terminal for connecting to an energy storage unit, and a DC output terminal; A bidirectional inverter, the bidirectional inverter comprising a DC side and an AC side, the DC side being connected to the DC output terminal, and the AC side being connected to the AC output terminal; a first current conversion unit connected to the first DC input terminal; a second current conversion unit connected to the second DC input terminal; as well as A power supply control device is connected to the bidirectional inverter, the first converter unit, and the second converter unit respectively, wherein the power supply control device is used to execute the power supply control method according to any one of claims 1 to 7.

10. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the power supply control method according to any one of claims 1 to 7 is implemented.

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