Low-cost tandem type medium-voltage UPS (Uninterrupted Power Supply) control system and method

Abstract

The invention discloses a low-cost tandem type medium-voltage UPS control system and method, and belongs to the technical field of electrical control, the low-cost tandem type medium-voltage UPS control system comprises a main power supply, an uninterruptible power supply and a load end, the main power supply, the uninterruptible power supply and the load end are jointly connected with a power supply system, and the power supply system comprises an uninterruptible power supply module, a transformation shunt module, a rectifier module and an inverter module. The voltage transformation and shunting module receives current output by the uninterruptible power supply, reduces voltage and then shunts the current into a plurality of alternating currents, the rectification module receives the shunted alternating currents and converts the alternating currents into direct currents to be output, the inversion module converts the direct currents into the alternating currents, all the alternating currents are connected in parallel, and square waves of all the alternating currents are staggered and superposed to obtain waveforms approaching sine waves. The uninterruptible power supply has the advantages that the rectification and voltage stabilization of the uninterruptible power supply can be completed through a plurality of small rectifiers and inverters, and the cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of electrical control, and in particular to a low-cost series medium-voltage UPS control system and method. Background Art

[0002] Currently, uninterruptible power supplies (UPS), essential electrical equipment for industrial or specialized environments, come in a variety of styles. These typically feature several secondary power sources. When the primary power source (usually the mains) fails, the UPS immediately connects to the secondary power source to ensure normal power supply to the load. The UPS voltage must be consistent with the primary power source. Industrial power supplies are typically medium- to high-voltage, placing high demands on the UPS's rectification and voltage regulation capabilities. The UPS's voltage must quickly rise to the same level as the primary power source, and its current harmonics must also match those of the primary power source.

[0003] The above-mentioned existing technical solutions have the following defects: in order to adapt to medium and high voltages, the requirements for the rectifier and inverter of the UPS are high, and the corresponding costs are also high. How to reduce the cost of the uninterruptible power supply is an important issue for users. Summary of the Invention

[0004] In order to reduce the rectification and voltage stabilization cost of an uninterruptible power supply in a medium- and high-voltage environment, the present application provides a low-cost series medium-voltage UPS control system and method.

[0005] On the one hand, the present application provides a low-cost series medium-voltage UPS control system that adopts the following technical solutions: A low-cost series medium-voltage UPS control system includes a main power supply, an uninterruptible power supply, and a load terminal. The main power supply, the uninterruptible power supply, and the load terminal are connected to a power supply system. The power supply system includes an uninterruptible power supply module, a transformer and shunt module, a rectifier module, and an inverter module. The uninterruptible power supply module connects the uninterruptible power supply and the load end when the main power supply is cut off; The voltage transformation and shunting module is connected to the uninterruptible power supply, receives the current output by the uninterruptible power supply, reduces the voltage and shuns it into multiple alternating currents; The rectifier module is connected to the transformer and shunt module to receive the shunted AC power and convert it into DC power for output; The inverter module is connected to the rectifier module and the uninterruptible power supply module, receives each DC power and converts the DC power into AC power, connects all the AC power in parallel, and makes the square waves of each AC power interlaced and superimposed to obtain a waveform close to a sine wave, and transmits the combined AC power to the uninterruptible power supply module.

[0006] By adopting the above solution, the AC power output by a high-voltage uninterruptible power supply is divided into multiple currents through a transformer and shunt module. The voltage of each current is significantly reduced, allowing each current to be rectified and stabilized by passing through a small rectifier and inverter. This makes small rectifiers and inverters much less expensive than large rectifiers and inverters. The control system of this application can effectively reduce the processing cost of medium- and high-voltage uninterruptible power supplies. After the uninterruptible power supply output voltage is divided into multiple AC currents and combined, the system controls the AC waveform to make it as close to a sine wave as possible. Sine waves have better energy efficiency, lower distortion potential, and less electromagnetic interference than square waves.

[0007] Preferably, the power supply system also includes a power cache module, which is connected to the rectifier module and the inverter module. The power cache module is preset with a minimum voltage value. When the uninterruptible power supply module is not working, the power cache module receives and stores the DC power output by the rectifier module. When the uninterruptible power supply module connects the uninterruptible power supply and the load end, and the output voltage of the rectifier module is lower than the minimum voltage value, it discharges to the inverter module.

[0008] By adopting the above solution, when the uninterruptible power supply is not supplying power to the load end, it will also release a certain amount of current. If clean energy is used as the uninterruptible power supply, the power also needs to be cached. The power cache module can cache the rectified DC power, which has higher storage efficiency than AC power and does not need to be rectified when used.

[0009] Preferably, the uninterruptible power supply module is provided with a warning time, a warning voltage value and an alarm voltage value. The uninterruptible power supply module detects the main power supply output voltage. When the voltage value of the main power supply output voltage drops within the warning time and exceeds the warning voltage value, or the voltage value of the main power supply output voltage is lower than the alarm voltage value, the uninterruptible power supply and the load end are connected.

[0010] By adopting the above solution, the uninterruptible power supply will automatically start when the main power voltage drops rapidly or the main power voltage is very low. Whether the main power is directly cut off or the main power is lost slowly, the uninterruptible power supply can respond quickly to ensure the power supply to the load end.

[0011] Preferably, the power supply system further includes a data storage module and a model building module, the inverter module includes a plurality of inverters, the inverters convert direct current into alternating current, the inverter module records setting data of each inverter, the inverter module detects waveform information of the received direct current, and transmits the waveform information and the inverter setting data to the data storage module; The data storage module receives and stores information; The model building module is preset with a convolutional neural network. The model building module calls the waveform information and inverter setting data stored in the data storage module, randomly selects the waveform information and inverter setting data as a test data group, tests the AC waveforms obtained after converting different direct currents into alternating currents under different test data groups, imports the test results into the convolutional neural network training to obtain a first training model, superimposes the AC waveforms corresponding to the same group of test data groups to obtain a merged waveform, screens the merged waveform to be a data group with a waveform close to a sine wave, imports the test process into a new convolutional neural network training to obtain a second training model, combines the first training model and the second training model to obtain a waveform calculation model, and the model building module transmits the waveform calculation model to the inverter module. The inverter module calculates the inverter setting data with a waveform close to a sine wave by interleaving and superimposing the square waves of each AC according to the waveform information of the direct current obtained in real time through the waveform calculation model.

[0012] By adopting the above solution, when integrating multiple AC power lines into one AC power line, the system can first calculate the possible AC power models based on the waveform information of the input DC power through a waveform calculation model, and obtain the AC power waveform closest to the sine wave in the screening results. Finally, the system infers the setting data of the inverter based on the obtained AC power waveform and the calculation process, and then configures the inverter according to the inverter setting data. This can ensure that the AC power waveform ultimately output by the uninterruptible power supply can be as close to the sine wave as possible. After the installation of a new medium or high voltage uninterruptible power supply or after a major overhaul, the inverter setting can be completed quickly, which is faster and less error-prone than manual calculation.

[0013] Preferably, after the inverter module calculates the setting data of each inverter through the waveform calculation model, it obtains the superimposed AC waveform calculated during the calculation process of the waveform calculation model, divides the AC waveform into multiple bands according to the flat wave, and adjusts the setting data of the inverter to make the lengths of adjacent bands uniform.

[0014] By adopting the above solution, after the waveform calculation model calculates the AC waveform, the system will also adjust the calculation result to ensure that the waveform of the AC power ultimately output by the uninterruptible power supply is as close to a sine wave as possible.

[0015] On the other hand, the present application provides a low-cost series medium-voltage UPS control method using the following technical solutions: A low-cost series medium-voltage UPS control method further includes the following steps: The main power supply supplies power to the load end, and the uninterruptible power supply supplies power to the load end when the main power supply is cut off; When the UPS supplies power to the load, the current output by the UPS is divided into multiple AC currents after voltage reduction. Rectify the divided AC power into DC power; Convert DC into AC and connect all AC in parallel so that the square waves of each AC are interleaved and superimposed to obtain a waveform close to a sine wave. The combined AC power is transmitted to the uninterruptible power supply module.

[0016] By adopting the above solution, the AC power output by a high-voltage uninterruptible power supply is divided into multiple currents through a transformer and shunt module. The voltage of each current is significantly reduced, allowing each current to be rectified and stabilized by passing through a small rectifier and inverter. This makes small rectifiers and inverters much less expensive than large rectifiers and inverters. The control system of this application can effectively reduce the processing cost of medium- and high-voltage uninterruptible power supplies. After the uninterruptible power supply output voltage is divided into multiple AC currents and combined, the system controls the AC waveform to make it as close to a sine wave as possible. Sine waves have better energy efficiency, lower distortion potential, and less electromagnetic interference than square waves.

[0017] Preferably, after the step of “rectifying the shunted AC power into DC power”, the following steps are further included: Preset minimum voltage value; When the UPS is not supplying power to the load, it receives and stores DC power; When the uninterruptible power supply supplies power to the load and the DC power voltage is lower than the minimum voltage value, the stored DC power is released.

[0018] By adopting the above solution, when the uninterruptible power supply is not supplying power to the load end, it will also release a certain amount of current. If clean energy is used as the uninterruptible power supply, the power also needs to be cached. The power cache module can cache the rectified DC power, which has higher storage efficiency than AC power and does not need to be rectified when used.

[0019] Preferably, the method further comprises the following steps: Set the warning time, warning voltage value and alarm voltage value; Detect the main power supply output voltage; When the voltage value of the main power supply output voltage drops within the warning time and exceeds the warning voltage value, or the voltage value of the main power supply output voltage is lower than the alarm voltage value, the uninterruptible power supply and the load end are connected.

[0020] By adopting the above solution, the uninterruptible power supply will automatically start when the main power voltage drops rapidly or the main power voltage is very low. Whether the main power is directly cut off or the main power is lost slowly, the uninterruptible power supply can respond quickly to ensure the power supply to the load end.

[0021] Preferably, the step of "converting direct current into alternating current" further comprises: A plurality of inverters are provided, which convert direct current into alternating current; Record the setting data of each inverter and detect the waveform information of DC power; A preset database stores the setting data of each inverter and the DC waveform information at each moment; Convolutional neural network is preset; Recalling waveform information and inverter setting data stored in a database, randomly selecting waveform information and inverter setting data as a test data group, and testing AC waveforms obtained after converting different DC power into AC power under different test data groups; The test results are introduced into a convolutional neural network training to obtain a first training model, the AC waveforms corresponding to the same test data group are superimposed to obtain a merged waveform, and the data group whose merged waveform is close to a sine wave is selected. The test process is introduced into a new convolutional neural network training to obtain a second training model, and the first training model and the second training model are combined to obtain a waveform calculation model; After obtaining the waveform information of the DC power, the waveform calculation model is used to calculate the inverter setting data that can make the square waves of each AC power interleave and superimpose to obtain a waveform close to a sine wave, and the inverter is configured according to the calculated inverter setting data.

[0022] By adopting the above solution, when integrating multiple AC power lines into one AC power line, the system can first calculate the possible AC power models based on the waveform information of the input DC power through a waveform calculation model, and obtain the AC power waveform closest to the sine wave in the screening results. Finally, the system infers the setting data of the inverter based on the obtained AC power waveform and the calculation process, and then configures the inverter according to the inverter setting data. This can ensure that the AC power waveform ultimately output by the uninterruptible power supply can be as close to the sine wave as possible. After the installation of a new medium or high voltage uninterruptible power supply or after a major overhaul, the inverter setting can be completed quickly, which is faster and less error-prone than manual calculation.

[0023] Preferably, after the step of "calculating inverter setting data capable of obtaining a waveform close to a sine wave by interleaving and superimposing square waves of each alternating current through a waveform calculation model", the following steps are further included: Obtaining the superimposed alternating current waveform calculated during the waveform calculation model calculation process; The AC waveform is divided into multiple bands according to the flat wave, and the setting data of the inverter is adjusted to make the lengths of adjacent bands uniform.

[0024] By adopting the above solution, after the waveform calculation model calculates the AC waveform, the system will also adjust the calculation result to ensure that the waveform of the AC power ultimately output by the uninterruptible power supply is as close to a sine wave as possible.

[0025] In summary, the present invention has the following beneficial effects: 1. After the uninterruptible power supply output voltage is divided into multiple AC lines and combined, the system will control the AC waveform to make it as close to a sine wave as possible. Compared with square waves, sine waves have better energy efficiency, lower distortion and less electromagnetic interference.

[0026] 2. After a new medium or high voltage uninterruptible power supply is installed or after a major overhaul, the inverter settings can be quickly completed, which is faster and less error-prone than manual calculations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the overall system block diagram of Example 1 of the present application.

[0028] Figure 2 This is a circuit diagram of Example 1 of the present application.

[0029] Figure 3 This is the overall system block diagram of Example 2 of the present application.

[0030] Description of reference numerals: 1. Main power supply; 2. Uninterruptible power supply; 3. Load end; 4. Power supply system; 41. Uninterruptible power supply module; 411. Connecting switch; 42. Transformer and shunt module; 42. Transformer; 43. Rectifier module; 431. Rectifier; 44. Inverter module; 441. Inverter; 45. Power cache module; 451. Large capacitor; 46. Data storage module; 47. Model building module. DETAILED DESCRIPTION

[0031] Example 1: This application embodiment discloses a low-cost series medium-voltage UPS control system, such as Figure 1 and Figure 2 As shown, it includes a main power supply 1, an uninterruptible power supply 2 and a load end 3. The main power supply 1, the uninterruptible power supply 2 and the load end 3 are commonly connected to a power supply system 4. The power supply system 4 includes an uninterruptible power supply module 41, a transformer and shunt module 42, a rectifier module 43, an inverter module 44 and a power cache module 45.

[0032] like Figure 1 and Figure 2 As shown, the uninterruptible power supply module 41 includes a connection switch 411. The uninterruptible power supply module 41 connects the uninterruptible power supply 2 and the load end 3 when the main power supply 1 is powered off.

[0033] like Figure 1 and Figure 2 As shown, the transformer 42 includes a transformer 42, which is connected in series to one end of the uninterruptible power supply 2. The transformer 42 receives the current output by the uninterruptible power supply 2 and then steps down the voltage and divides it into multiple alternating currents.

[0034] like Figure 1 and Figure 2 As shown, the rectifier module 43 includes multiple rectifiers 431, each rectifier 431 is connected in series to the transformer 42, the rectifier module 43 is connected to the transformer and shunt module 42, and the rectifier 431 receives the shunted AC power and converts it into DC power for output.

[0035] like Figure 1 and Figure 2 As shown, inverter module 44 includes multiple inverters 441. The number of inverters 441 is the same as the number of rectifiers 431. Each inverter 441 is connected in series to the end of rectifier 431 away from transformer 42. The other ends of all inverters 441 are connected in parallel to one end of connection switch 411. Inverter module 44 connects to rectifier module 43 and uninterruptible power supply module 41, receives each DC power line and converts it into AC power. It connects all AC power lines in parallel, interleaving and superimposing the square waves of each AC power line to produce a waveform close to a sine wave. The combined AC power is then transmitted to uninterruptible power supply module 41.

[0036] like Figure 1 and Figure 2 As shown, the power buffer module 45 includes multiple large capacitors 451, each of which is connected in parallel between the rectifier 431 and the inverter 441. The power buffer module 45 connects the rectifier module 43 and the inverter module 44. It has a preset minimum voltage. When the uninterruptible power supply module 41 is not operating, the power buffer module 45 receives and stores the DC power output by the rectifier module 43. When the uninterruptible power supply module 41 connects the uninterruptible power supply 2 and the load terminal 3, and the output voltage of the rectifier module 43 falls below the minimum voltage, the power buffer module 45 discharges the DC power to the inverter module 44. When the uninterruptible power supply 2 is not supplying power to the load terminal 3, it will also release a certain amount of current. If the uninterruptible power supply 2 is using clean energy, it also needs to cache power. The power buffer module 45 can cache rectified DC power, which has higher storage efficiency than AC power and does not require rectification before use.

[0037] The implementation principle of a low-cost series medium-voltage UPS control system and method in the present embodiment is as follows: the AC power output by the high-voltage uninterruptible power supply 2 is divided into multiple currents by the transformer and shunt module 42. The voltage of each current is significantly reduced, so that each current can be rectified and stabilized by passing through a small rectifier 431 and inverter 441. This makes the cost of small rectifiers 431 and inverters 441 much lower than that of large rectifiers 431 and inverters 441. The control system of the present application can effectively reduce the processing cost of the medium- and high-voltage uninterruptible power supply 2. After the output voltage of the uninterruptible power supply 2 is divided into multiple AC currents and combined, the system controls the AC waveform to make it as close to a sine wave as possible. Sine waves have better energy efficiency, lower distortion potential, and less electromagnetic interference than square waves.

[0038] Example 2: This application embodiment discloses a low-cost series medium-voltage UPS control system, such as Figure 3 As shown, the power supply system 4 further includes a data storage module 46 and a model building module 47 .

[0039] like Figure 3 As shown, the uninterruptible power supply module 41 is configured with a warning time, a warning voltage value, and an alarm voltage value. The uninterruptible power supply module 41 detects the output voltage of the main power supply 1. When the output voltage of the main power supply 1 drops by a value exceeding the warning voltage value within the warning time, or when the output voltage of the main power supply 1 drops below the alarm voltage value, the uninterruptible power supply 2 is connected to the load end 3. The uninterruptible power supply 2 automatically activates when the voltage of the main power supply 1 drops rapidly or is very low. Whether the main power supply 1 loses power directly or gradually, the uninterruptible power supply 2 can react quickly to ensure power supply to the load end 3.

[0040] like Figure 3 As shown, the data storage module 46 receives and stores information. The inverter module 44 records the setting data of each inverter 441 . The inverter module 44 detects the waveform information of the received DC power and transmits the waveform information and the setting data of the inverter 441 to the data storage module 46 .

[0041] like Figure 3 As shown, the model building module 47 is preset with a convolutional neural network. The model building module 47 calls the waveform information and the setting data of the inverter 441 stored in the data storage module 46, randomly selects the waveform information and the setting data of the inverter 441 as the test data group, tests the AC waveform obtained after converting different DC power into AC power under different test data groups, imports the test results into the convolutional neural network training to obtain a first training model, superimposes the AC waveforms corresponding to the same group of test data groups to obtain a merged waveform, screens the merged waveform to be a data group with a waveform close to a sine wave, imports the test process into the new convolutional neural network training to obtain a second training model, combines the first training model and the second training model to obtain a waveform calculation model, and the model building module 47 transmits the waveform calculation model to the inverter module 44. The inverter module 44 calculates the setting data of the inverter 441 with a waveform close to a sine wave by interleaving and superimposing the square waves of each AC power according to the waveform information of the DC power obtained in real time through the waveform calculation model.

[0042] like Figure 3 As shown, after the inverter module 44 calculates the setting data of each inverter 441 through the waveform calculation model, it obtains the superimposed AC waveform calculated during the calculation process of the waveform calculation model, divides the AC waveform into multiple bands according to the flat wave, and adjusts the setting data of the inverter 441 to make the lengths of adjacent bands uniform.

[0043] When integrating multiple AC power lines into one AC power line, the system can first calculate the possible AC power models based on the waveform information of the input DC power through the waveform calculation model, and obtain the AC power waveform closest to the sine wave in the screening results. Finally, the system infers the setting data of the inverter 441 based on the obtained AC power waveform and the calculation process, and then configures the inverter 441 according to the setting data of the inverter 441, so as to ensure that the AC power waveform finally output by the uninterruptible power supply 2 can be as close to the sine wave as possible. After the new medium and high voltage uninterruptible power supply 2 is installed or after a major overhaul, the setting of the inverter 441 can be completed quickly, which is faster and less prone to errors than manual calculation.

[0044] Example 3: This embodiment of the present application discloses a low-cost series medium-voltage UPS control method, and the specific steps are as follows: Preset minimum voltage value.

[0045] The main power supply 1 supplies power to the load terminal 3 , and the uninterruptible power supply 2 supplies power to the load terminal 3 when the main power supply 1 is powered off.

[0046] When the uninterruptible power supply 2 supplies power to the load end 3, the current output by the uninterruptible power supply 2 is divided into multiple alternating currents after voltage reduction.

[0047] Rectify the divided AC power into DC power.

[0048] When the uninterruptible power supply 2 is not supplying power to the load terminal 3, it receives and stores DC power.

[0049] When the uninterruptible power supply 2 supplies power to the load terminal 3 and the voltage of the DC power is lower than the minimum voltage value, the stored DC power is released.

[0050] Convert direct current into alternating current, and connect all the alternating currents in parallel so that the square waves of each alternating current are interleaved and superimposed to obtain a waveform close to a sine wave.

[0051] The combined AC power is transmitted to the uninterruptible power supply module 41 .

[0052] Example 4: This embodiment of the present application discloses a low-cost series medium-voltage UPS control method, the specific steps of which are as follows: Set the warning time, warning voltage value and alarm voltage value, and preset the database and convolutional neural network.

[0053] Detect the output voltage of main power supply 1.

[0054] When the output voltage of main power supply 1 drops below the warning voltage within the warning time, or when the output voltage of main power supply 1 drops below the alarm voltage, UPS 2 is connected to load terminal 3. UPS 2 automatically activates when the voltage of main power supply 1 drops rapidly or becomes very low. Whether the main power supply 1 loses power directly or gradually, UPS 2 can react quickly to ensure power supply to load terminal 3.

[0055] The setting data of each inverter 441 is recorded, and the waveform information of the DC power is detected.

[0056] The database stores the setting data of each inverter 441 and the waveform information of the DC power at each moment.

[0057] The waveform information and setting data of the inverter 441 stored in the database are called, and the waveform information and setting data of the inverter 441 are randomly selected as a test data group to test the AC waveform obtained after converting different DC power into AC power under different test data groups.

[0058] The test results are imported into the convolutional neural network training to obtain the first training model, the AC waveforms corresponding to the same group of test data groups are superimposed to obtain a merged waveform, the merged waveform is screened to be a data group with a waveform close to a sine wave, the test process is imported into the new convolutional neural network training to obtain the second training model, and the first training model and the second training model are combined to obtain a waveform calculation model.

[0059] After obtaining the waveform information of the direct current, the waveform calculation model is used to calculate the setting data of the inverter 441 so that the square waves of each alternating current can be interleaved and superimposed to obtain a waveform close to a sine wave.

[0060] Obtain the superimposed alternating current waveform calculated during the waveform calculation model calculation process.

[0061] The AC waveform is divided into multiple bands according to the flat wave, and the setting data of the inverter 441 is adjusted to make the lengths of adjacent bands uniform.

[0062] The inverter 441 is configured according to the calculated setting data of the inverter 441. After the waveform calculation model calculates the AC waveform, the system will also adjust the calculation result to ensure that the waveform of the AC power finally output by the uninterruptible power supply 2 is as close to a sine wave as possible.

[0063] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-cost series medium-voltage UPS control system, characterized by: The system comprises a main power supply (1), an uninterruptible power supply (2) and a load end (3); the main power supply (1), the uninterruptible power supply (2) and the load end (3) are connected to a power supply system (4); the power supply system (4) comprises an uninterruptible power supply module (41), a voltage transformation and shunt module (42), a rectifier module (43) and an inverter module (44); The uninterruptible power supply module (41) connects the uninterruptible power supply (2) and the load end (3) when the main power supply (1) is powered off; The voltage transformation and shunting module (42) is connected to the uninterruptible power supply (2), receives the current output by the uninterruptible power supply (2), reduces the voltage, and shuns the current into multiple alternating currents; The rectifier module (43) is connected to the transformer and shunt module (42), receives the shunted alternating current and converts it into direct current for output; The inverter module (44) is connected to the rectifier module (43) and the uninterruptible power supply module (41), receives each direct current and converts the direct current into alternating current, connects all the alternating currents in parallel, and makes the square waves of each alternating current overlap to obtain a waveform close to a sine wave, and transmits the combined alternating current to the uninterruptible power supply module (41).

2. A low-cost series medium-voltage UPS control system according to claim 1, characterized in that: The power supply system (4) further includes a power cache module (45), which is connected to the rectifier module (43) and the inverter module (44). The power cache module (45) is preset with a minimum voltage value. When the uninterruptible power supply module (41) is not working, the power cache module (45) receives and stores the direct current output by the rectifier module (43). When the uninterruptible power supply module (41) connects the uninterruptible power supply (2) and the load end (3), and the output voltage of the rectifier module (43) is lower than the minimum voltage value, the power cache module (45) discharges the direct current to the inverter module (44).

3. The low-cost series medium-voltage UPS control system according to claim 1, characterized in that: The uninterruptible power supply module (41) is provided with a warning time, a warning voltage value, and an alarm voltage value. The uninterruptible power supply module (41) detects the output voltage of the main power supply (1). When the voltage value of the output voltage of the main power supply (1) decreases within the warning time and exceeds the warning voltage value, or when the voltage value of the output voltage of the main power supply (1) is lower than the alarm voltage value, the uninterruptible power supply (2) and the load end (3) are connected.

4. The low-cost series medium voltage UPS control system and method according to claim 1, characterized in that: The power supply system (4) further includes a data storage module (46) and a model building module (47); the inverter module (44) includes a plurality of inverters (441); the inverters (441) convert direct current into alternating current; the inverter module (44) records setting data of each inverter (441); the inverter module (44) detects waveform information of the received direct current and transmits the waveform information and the setting data of the inverter (441) to the data storage module (46); The data storage module (46) receives and stores information; The model building module (47) is preset with a convolutional neural network. The model building module (47) calls the waveform information and the setting data of the inverter (441) stored in the data storage module (46), randomly selects the waveform information and the setting data of the inverter (441) as a test data group, tests the AC waveform obtained after converting different DC power into AC power under different test data groups, imports the test results into the convolutional neural network training to obtain a first training model, superimposes the AC waveforms corresponding to the same test data group to obtain a merged waveform, selects the merged waveform to be a data group with a waveform close to a sine wave, imports the test process into a new convolutional neural network training to obtain a second training model, combines the first training model and the second training model to obtain a waveform calculation model, and the model building module (47) transmits the waveform calculation model to the inverter module (44). The inverter module (44) calculates the inverter (441) setting data with a waveform close to a sine wave by interleaving and superimposing the square waves of each AC power according to the waveform information of the DC power obtained in real time through the waveform calculation model.

5. A low-cost series medium voltage UPS control system and method according to claim 4, characterized in that: After the inverter module (44) calculates the setting data of each inverter (441) through the waveform calculation model, it obtains the superimposed AC waveform calculated in the waveform calculation model calculation process, divides the AC waveform into multiple bands according to the flat wave, and adjusts the setting data of the inverter (441) to make the lengths of adjacent bands uniform.

6. A low-cost series medium-voltage UPS control method, characterized in that: The following steps are also included: The main power supply (1) supplies power to the load end (3), and the uninterruptible power supply (2) supplies power to the load end (3) when the main power supply (1) is powered off; When the uninterruptible power supply (2) supplies power to the load end (3), the current output by the uninterruptible power supply (2) is divided into multiple alternating currents after voltage reduction; Rectify the divided AC power into DC power; Convert DC into AC and connect all AC in parallel so that the square waves of each AC are interleaved and superimposed to obtain a waveform close to a sine wave. The combined AC power is transmitted to the uninterruptible power supply module (41).

7. A low-cost series medium voltage UPS control method according to claim 6, characterized in that: After the step of "rectifying the shunted alternating current into direct current", the following steps are further included: Preset minimum voltage value; When the uninterruptible power supply (2) does not supply power to the load end (3), receiving and storing direct current; When the uninterruptible power supply (2) supplies power to the load terminal (3) and the voltage of the direct current is lower than the minimum voltage value, the stored direct current is released.

8. The low-cost series medium voltage UPS control method according to claim 6, characterized in that: The following steps are also included: Set the warning time, warning voltage value and alarm voltage value; Detecting the output voltage of the main power supply (1); When the output voltage of the main power supply (1) decreases to a value exceeding the warning voltage value within the warning time, or when the output voltage of the main power supply (1) is lower than the alarm voltage value, the uninterruptible power supply (2) and the load end (3) are connected.

9. The low-cost series medium voltage UPS control method according to claim 6, characterized in that: The step of "converting direct current into alternating current" also includes: A plurality of inverters (441) are provided, and the inverters (441) convert direct current into alternating current; Recording the setting data of each inverter (441) and detecting the waveform information of the direct current; A preset database stores setting data of each inverter (441) and waveform information of direct current at each moment; Convolutional neural network is preset; Recalling waveform information and inverter (441) setting data stored in a database, randomly selecting the waveform information and inverter (441) setting data as a test data group, and testing AC waveforms obtained after converting different direct currents into alternating currents under different test data groups; The test results are introduced into a convolutional neural network training to obtain a first training model, the AC waveforms corresponding to the same test data group are superimposed to obtain a merged waveform, and the data group whose merged waveform is close to a sine wave is selected. The test process is introduced into a new convolutional neural network training to obtain a second training model, and the first training model and the second training model are combined to obtain a waveform calculation model; After obtaining the waveform information of the direct current, the waveform calculation model is used to calculate the inverter (441) setting data that can make the square waves of each alternating current interleave and superimpose to obtain a waveform close to a sine wave, and the inverter (441) is configured according to the calculated inverter (441) setting data.

10. A low-cost series medium voltage UPS control method according to claim 9, characterized in that: The step of "calculating the inverter (441) setting data so that each alternating current square wave can be interleaved and superimposed to obtain a waveform close to a sine wave through a waveform calculation model" also includes: Obtaining the superimposed alternating current waveform calculated during the waveform calculation model calculation process; The AC waveform is divided into a plurality of bands according to a flat wave, and the setting data of the inverter (441) is adjusted to make the lengths of adjacent bands uniform.

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