Distributed power supply control system for high-power laboratory

Abstract

The invention relates to a distributed power supply control system for a high-power laboratory. The distributed power supply control system comprises a power distribution combination, a plurality of power supply combinations and a plurality of direct current output units, the power distribution combination, the plurality of power supply combinations and the plurality of direct current output units communicate with one another through a CAN (Controller Area Network) bus; the power distribution combination and the plurality of power supply combinations are connected through an alternating current bus; the output ends of the plurality of power supply combinations are connected through a direct current bus; each power supply combination is correspondingly connected with one direct current output unit; the power distribution combination is used for converting input power supply of the power supply source into 220V alternating current power supply and supplying power to the power supply combination through an alternating current bus; wherein the power supply source comprises a mains supply, a generator and a standby power supply; the power supply combination is used for converting alternating current into 26V-29V direct current to supply power to the direct current output unit; the direct current output unit adopts a bidirectional Buck-Boost power supply module to realize one-path direct current input to multi-path direct current output to supply power to electric equipment, energy is effectively saved, the service life of the power supply is prolonged, and centralized power supply or distributed power supply can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of power supply control, and in particular relates to a distributed power supply control system used in a high-power laboratory. Background Art

[0002] In modern laboratories, especially in environments where magnetic resonance imaging (MRI) equipment is used, the stability and reliability of power supply are extremely important. MRI equipment has very high requirements for power supply, and any voltage fluctuations or frequency changes may affect the imaging quality and data accuracy. Traditional centralized power supply methods have obvious shortcomings when facing MRI equipment. For example, the high instantaneous power demand during MRI operation may cause power grid fluctuations, affecting the normal operation of equipment and other precision instruments. In addition, traditional systems lack sufficient redundancy design. Once the main power supply fails, the process of switching to the backup power supply may cause MRI operation to be interrupted.

[0003] To solve these problems, modern laboratories often use advanced power solutions such as UPS, voltage stabilizers and independent power distribution units to reduce the impact of external power fluctuations and ensure the stable operation of MRI equipment. Reasonable power planning is also critical and helps to improve the reliability and efficiency of the entire system. Patent No. CN116960786A discloses an intelligent power distribution combination dual power supply system, which ensures the uninterrupted operation of the internal components of the power distribution combination body through the set power supply combination, main power supply, dual power supply automatic transfer switch, auxiliary power supply, power supply monitoring sensor and controller.

[0004] Patent No. CN118630597A discloses a multi-channel redundant configuration and live pluggable intelligent high-voltage power distribution combination and its control system. Each high voltage is controlled by a power module. The faulty module can be automatically isolated and can be isolated, plugged in and repaired in a live state. The repair can be completed by replacing the faulty module. The combination structure can be configured with corresponding functional devices in the module combination as needed, and the combination is coordinated with the internal connector, so the structure is versatile and strong.

[0005] However, in the implementation of relevant technologies, it is difficult to achieve refined energy consumption management by deploying a centralized power supply system, which easily leads to waste of resources. In the face of emergencies such as natural disasters or power grid failures, the centralized power supply has a slow recovery speed and cannot quickly guarantee the uninterrupted operation of laboratory equipment. With the expansion of laboratory scale and the advancement of technology, the centralized power supply system lacks scalability and flexibility and is difficult to adapt to future changes. Summary of the invention

[0006] In order to solve the problems existing in the background technology, the present invention provides a distributed power supply control system for a high-power laboratory, comprising:

[0007] A power distribution assembly, multiple power supply assemblies and multiple DC output units; the power distribution assembly, multiple power supply assemblies and multiple DC output units communicate with each other via a CAN bus; the power distribution assembly and multiple power supply assemblies are connected via an AC bus; the output ends of the multiple power supply assemblies are connected via a DC bus; each power supply assembly is connected to a corresponding DC output unit;

[0008] The power distribution assembly is used to convert the input power of the power supply source into 220V AC power supply, and supply power to the power supply assembly through the AC bus; wherein the power supply source includes: mains power, generator and backup power supply;

[0009] The power supply assembly is used to convert AC power into 26V to 29V DC power to supply power to the DC output unit;

[0010] The DC output unit uses a bidirectional Buck-Boost power module to realize one DC input to multiple DC outputs to supply power to the electrical equipment;

[0011] The input power supply of the power distribution combination includes:

[0012] When the sum of the current output powers of all power supply combinations is greater than the rated output power of the AC power, the distribution combination is simultaneously connected to the AC power and the generator as input power; when the sum of the current output powers of all power supply combinations is greater than the sum of the rated output powers of the AC power and the generator, the distribution combination is simultaneously connected to the AC power, the generator and the backup power supply as input power; when the sum of the current output powers of all power supply combinations is less than the rated output power of the input power supply of the distribution combination, and when the output power required by the DC output unit corresponding to a certain power supply combination is greater than the rated output power of the power supply combination, the output voltage of the remaining power supply combinations is adjusted in the range of 27-29V, so that the remaining power supply combinations balance energy to the power supply combination through the DC bus until the output power requirement of the power supply combination is met.

[0013] Preferably, the power distribution combination includes: a power detection circuit, a state estimation unit, a mode control unit and a communication unit; the power detection circuit is used to collect output power information of the power distribution combination from the AC bus; the state estimation unit is used to calculate the difference between the output power of the power distribution combination and its rated power; the mode control unit is used to control the power distribution combination to access one or more of the mains, generator and backup power supply as a power supply source according to the difference calculated by the state estimation unit; the communication unit communicates with the state estimation unit, the mode control unit and the CAN bus to transmit relevant instructions and data.

[0014] Preferably, the backup power supply is a DC power supply source. When the power distribution assembly needs to be connected to the backup power supply as a power supply source, the DC power output by the backup power supply must first be converted into AC power through the following current conversion module; the current conversion module includes: an inverter, an SPWM module, a DAC converter, a current loop, a voltage loop, an ADC converter, a single-chip microcomputer, a CAN unit and a power acquisition module;

[0015] The input end of the inverter is connected to the output end of the backup power supply, which is used to convert direct current into alternating current; the output end of the inverter is connected to the AC bus; the ADC converter is used to collect the instantaneous voltage of the AC bus; the power acquisition module is used to collect power information of the AC bus; the single-chip microcomputer is used to calculate the effective voltage of the AC bus according to the power of the AC bus collected by the power acquisition module; the single-chip microcomputer is used to calculate the voltage difference between the effective voltage and the instantaneous voltage of the AC bus, and calculate the current difference according to the voltage difference and the expected power value, the expected power value is the sum of the current output power of all power supply combinations minus the sum of the rated output power of the mains and the generator, and the calculated voltage difference and current difference are sent to the voltage loop and the current loop respectively; the voltage loop generates a feedback signal based on the voltage difference and transmits it to the current loop; the output end of the current loop is connected to the input end of the DAC converter; the output end of the SPWM module is connected to the control end of the inverter, which is used to control the inverter; the single-chip microcomputer is connected to the CAN bus through the CAN unit, which is used to transmit relevant instructions and data.

[0016] Preferably, the power supply combination includes: an AC filter module, N PFC modules, N DC / DC modules, an output filter module, an output detection module, a power adjustment unit, a compensation control unit, an auxiliary power supply, a single chip microcomputer and a CAN communication module;

[0017] The AC filter module is used to filter the input AC power, and the output end of the AC filter module is connected to the input end of the auxiliary power supply and the input end of N PFC modules; the output end of the auxiliary power supply is connected to the power regulation unit and the single-chip microcomputer for providing power; the power regulation unit is connected to the compensation control unit and the N PFC modules respectively; the N PFC modules and the N DC / DC modules together constitute N AC / DC modules for converting AC power into DC power; the output ends of the N DC / DC modules are connected to the input end of the output filter module for filtering the output DC power, and the output end of the output filter module is connected to the DC bus; the output detection module is used to detect the power of the DC bus; the output end of the output detection module is connected to the compensation control unit; the compensation control unit is connected to the power regulation unit; the power compensation unit is connected to the N DC / DC modules; the single-chip microcomputer is connected to the power regulation unit and the compensation control unit; the CAN communication module is connected to the auxiliary power supply, the power regulation unit, the Hall sensor, the single-chip microcomputer and the compensation control unit for transmitting related instructions and data.

[0018] Preferably, the DC output unit comprises: a plurality of DC output branches; each DC output branch comprises: a DCDC module, a current loop n, a voltage loop n, a single-chip microcomputer and a sampling module; the input end of the DCDC module is connected to a DC bus; the output end of the DCDC module is connected to an output load; the sampling module is used to collect the instantaneous current at the output end of the DCDC module through a Hall sensor and calculate the output voltage at the output end of the DCDC module through a loss resistor;

[0019] The single-chip computer monitors and obtains the voltage value and current value of the output end of the DCDC module in real time, receives the output end voltage of the power supply combination and the target power of the power supply combination through the communication module, and the output end voltage of the power supply combination is used as the reference voltage; the difference between the reference voltage and the voltage of the output end of the DCDC module is calculated to obtain the difference voltage; the power value of the output end of the DCDC module is calculated by the voltage of the output end of the DCDC module and the current of the output end of the DCDC module; the difference power is calculated based on the power value of the output end of the DCDC module and the target power of the power supply combination; the difference current is calculated based on the difference power and the difference voltage, and the difference voltage and the difference current are respectively sent to the voltage loop n and the current loop n to control the DCDC module to achieve power stability and load balancing; the current loop n generates a feedback signal according to the difference current and sends it to the voltage loop n; the voltage loop n is used to generate a PWM signal to control the output end voltage of the DCDC module; the communication module and the single-chip computer are connected to the CAN communication bus for transmitting related instructions and data.

[0020] The present invention has at least the following beneficial effects

[0021] The present invention can realize real-time monitoring and control of power supply through the coordinated work of power distribution combination, power supply combination and DC output unit, ensuring stable and reliable power supply for various high-precision equipment in the laboratory; the power distribution combination can access the mains, generator and backup power supply as needed, and adjust the power supply source in real time to cope with the dynamic changes in the power demand of the power-consuming equipment; the power supply combination includes components such as AC filter module, PFC module, DC / DC module and output filter module, which can ensure that the output DC power is stable and reliable, and meet the high requirements of high-precision equipment for power quality; the distributed power supply and control system transmits control commands, status and data through a three-level control management architecture to achieve centralized control of the entire system. The power supply combinations are connected through a DC bus, which can achieve energy balance and power regulation, ensure the output power balance between each power supply combination, and can perform intelligent power regulation and energy distribution according to actual needs; the present invention effectively saves energy and improves the service life of the power supply, thereby realizing centralized power supply or distributed power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the distributed power supply control system of the present invention;

[0023] Figure 2 A bus relationship diagram of a distributed power supply control system of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the power distribution assembly of the present invention;

[0025] Figure 4 A structural diagram of the backup power supply converted to a power supply source of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the power supply combination of the present invention;

[0027] Figure 6 It is a structural schematic diagram of a DC output unit of the present invention;

[0028] Figure 7 This is a schematic diagram of a practical application scenario of the present invention. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] See also Figure 1 to Figure 7 , Example 1, please refer to Figure 1 and Figure 2 For scientific research institutions that conduct medical research, most of them are high-power laboratories that need to provide stable and reliable power supply for a variety of high-precision experimental equipment. These equipment have high requirements for power quality and different power requirements. In order to meet these requirements, this laboratory decided to adopt a distributed power control system for high-power laboratories, including:

[0031] The power distribution unit is deployed in the main power distribution room of the laboratory and is responsible for converting the input power from the mains, generators and backup power sources (such as battery packs) into 220V AC power.

[0032] The power distribution combination is equipped with a power detection circuit, a state estimation unit, a mode control unit and a communication unit to achieve real-time monitoring and control of the output power.

[0033] The power supply combinations are deployed in various areas of the laboratory, and each area is configured with a certain number of power supply combinations based on the power requirements of the equipment.

[0034] Each power supply combination includes components such as AC filter module, PFC module, DC / DC module, output filter module, etc. to ensure that the output DC power is stable and reliable.

[0035] The power supply combinations are connected via a DC bus to achieve energy balancing and power regulation.

[0036] The DC output unit is deployed close to the experimental equipment to facilitate the power supply to the equipment.

[0037] Each DC output unit includes components such as DCDC module, current loop, voltage loop, and effective value calculation module to ensure that the output DC power meets the power requirements of the equipment.

[0038] The DC output units communicate with the power distribution assembly and the power supply assembly via the CAN bus to achieve intelligent power regulation and energy balance.

[0039] The distributed power supply and control system transmits control commands, status and data through a three-level control management architecture; the distribution combination transmits relevant status and data with the host computer and display panel through the CAN bus, and exchanges and summarizes information with each power supply combination through the CAN bus, thereby realizing centralized control of the entire distributed power supply; the display panel is used to monitor the AC output status of the mains, generator and backup power supply, as well as the DC output status of each power supply combination and the DC output status of the DC output unit, and transmits the monitored status information to the host computer; the host computer generates corresponding control instructions based on the received status information, and transmits them to the distribution combination and / or power supply combination through the CAN bus to realize centralized control of the entire distributed power supply.

[0040] The generator is a single-phase AC220V alternating current generator, and the output voltage of the DC generator is DC28V, high voltage DC360V or the voltage required by the user; the host computer (for operation, maintenance and management equipment, can be a PC, hereinafter referred to as the host computer).

[0041] See also Figure 3 , Embodiment 2, the power distribution combination comprises: a power detection circuit, a state estimation unit, a mode control unit and a communication unit;

[0042] The power detection circuit is directly connected to the AC bus, and the power information of the AC bus is collected in real time, including: current output power, voltage, current and other parameters, and the collected power information is transmitted to the state estimation unit;

[0043] The state estimation unit receives the power information transmitted by the power detection circuit and the sum of the current output powers of all power supply combinations, and calculates the difference between the rated output power of the AC bus and the sum of the current output powers of all power supply combinations. The mode control unit is used to evaluate whether the current power supply is sufficient and whether the power supply source needs to be adjusted according to the difference calculated by the state estimation unit; the mode control unit controls the power distribution combination to access one or more of the mains, generator and backup power supply as the power supply source according to the calculation result of the state estimation unit;

[0044] When the mains power supply is sufficient and stable, the mains power is connected first; when the mains power supply is insufficient or unstable, the generator is automatically connected as a supplement or substitute; when both the mains power and the generator cannot meet the demand, the backup power supply is connected to ensure the continuity of power supply; the connected power supply source is adjusted in real time to cope with the dynamic changes in the power demand of the power-consuming equipment; the communication unit communicates with the state estimation unit, the mode control unit and the CAN bus; the power difference calculated by the state estimation unit, the decision instructions of the mode control unit and the operating status information of the distribution combination are transmitted; feedback information from the power supply combination and the DC output unit is received to perform more accurate power distribution and regulation; and the CAN bus is used to communicate with other distribution combinations, power supply combinations and DC output units to achieve collaborative work and intelligent management of the entire system.

[0045] See also Figure 4 , Example 3, when the power distribution assembly needs to be connected to a backup power source (DC power supply source), the current conversion module realizes the conversion from DC to AC to ensure that the power distribution assembly can stably output AC power:

[0046] When the power distribution combination needs to be connected to the backup power supply, the inverter starts working and converts DC power into AC power; the ADC converter collects the instantaneous voltage of the AC bus in real time and converts it into a digital signal; the power acquisition module collects the power data of the AC bus and transmits it to the single-chip microcomputer; the single-chip microcomputer calculates the effective voltage of the AC bus based on the power of the AC bus collected by the power acquisition module; the single-chip microcomputer is used to calculate the voltage difference between the effective voltage and the instantaneous voltage of the AC bus, and calculate the current difference based on the voltage difference and the expected power value, that is, the current difference is obtained by multiplying the power by the voltage by the current, and the expected power value is the sum of the current output power of all power supply combinations minus the sum of the rated output power of the mains and the generator, and The calculated voltage difference and current difference are sent to the voltage loop and the current loop respectively; the voltage loop generates a feedback signal based on the voltage difference and transmits it to the current loop; the output end of the current loop is connected to the input end of the DAC converter; the output end of the SPWM module is connected to the control end of the inverter for controlling the inverter; the single-chip microcomputer is connected to the CAN bus through the CAN unit for transmitting relevant instructions and data; the DAC converter converts the digital feedback signal output by the current loop into an analog signal for use by the SPWM module; the SPWM module generates a PWM signal based on the analog signal provided by the DAC converter; the PWM signal will control the switching device of the inverter, thereby realizing precise adjustment of the output voltage and current.

[0047] See also Figure 5, Embodiment 4, the power supply combination includes: an AC filter module, N PFC modules, N DC / DC modules, an output filter module, an output detection module, a power regulation unit, a compensation control unit, an auxiliary power supply, a single chip microcomputer and a CAN communication module;

[0048] AC filter module: The main function of this module is to filter the input AC power to remove high-frequency noise and interference in the power grid and ensure the input stability of the subsequent power conversion module.

[0049] N PFC (power factor correction) modules, the PFC module is used to improve the power factor of the power supply system, reduce reactive power, and thus reduce grid losses; in this system, N PFC modules work in parallel, which can further improve the power handling capability and reliability of the system.

[0050] N DC / DC modules, the DC / DC module is used to further convert the DC power converted by the PFC module into the required DC voltage level; paired with the PFC module to form N AC / DC modules, together realizing the conversion from AC to DC.

[0051] Output filter module, which filters the DC power output by the DC / DC module to remove high-frequency noise and ripples to ensure the voltage stability on the DC bus.

[0052] Output detection module, which is used to detect power information on the DC bus.

[0053] The compensation control unit is used to calculate the compensation power according to the difference between the target power information of the power supply combination and the power information collected by the output detection module, and transmit it to the single-chip microcomputer; the target power information of the power supply combination is set by the host computer, and the user can input it in the host computer, and transmit it to the single-chip microcomputer via the CAN communication bus, and then the single-chip microcomputer transmits it to the compensation control unit;

[0054] The single-chip microcomputer is used to obtain the target power information of the power supply combination through the CAN communication unit, and transmit it to the compensation control unit, that is, the power information required by the power supply combination; and obtain the compensation power calculated by the compensation control unit; when the compensation power is greater than the set threshold, the compensation control unit is controlled to lower the output voltage of the DC / DC module, and the power regulation unit is controlled to increase the output current of the PFC module by using an open-loop control method; when the compensation power is less than the threshold, the power regulation unit is controlled to use a closed-loop adaptive control method to slowly adjust the output current according to the compensation power value, and the compensation control unit is controlled to restore the output voltage of the DC / DC module; when the output power of the power supply combination is stable and the output power of the power supply combination is less than the rated power, the power regulation unit enters a low power consumption mode.

[0055] Auxiliary power supply, the auxiliary power supply (battery pack) provides the required DC power for other modules in the system. At the same time, the auxiliary power supply can be connected to the DC bus and controlled by the host computer through the CAN communication bus.

[0056] The single-chip microcomputer port of the power supply combination realizes the parallel control of 4 AC / DC module power supplies. The AC / DC power module mainly completes the conversion from AC input to DC output, and is mainly composed of EMC filter circuit, PFC power factor correction (PFC) circuit, DC / DC isolation conversion circuit and control circuit, AC / DC structure. The AC / DC core module uses a full-brick AC / DC universal power supply module, whose rated output voltage is 28V, the output voltage is adjustable from 26V to 29V, and the maximum output current is 53A. In order to meet the power demand of the DC power supply combination output, the power supply combination of this embodiment uses 4 ACDC modules in parallel, the high-power power supply combination uses a 1.5KW AD / DC module, and the low-power power supply combination uses a 600WAD / DC module, which can achieve N+1 redundancy; in this embodiment, the PFC is controlled based on the power regulation unit to reduce the output voltage of the power supply combination to complete the energy balance between the power supply combinations. When each power supply combination completes the energy balance, the DC / DC conversion module of the power supply combination is controlled by the compensation control unit to restore its output voltage.

[0057] See also Figure 6 , Embodiment 5, the DC output unit includes: a plurality of DC output branches; each DC output branch includes: a DCDC module, a current loop n, a voltage loop n, a single-chip microcomputer and a sampling module; the input end of the DCDC module is connected to the DC bus; the output end of the DCDC module is connected to the output load; the sampling module is used to collect the instantaneous current at the output end of the DCDC module through the Hall sensor and calculate the output voltage at the output end of the DCDC module through the loss resistor;

[0058] The single-chip computer monitors and obtains the voltage value and current value of the output end of the DCDC module in real time, receives the output end voltage of the power supply combination and the target power of the power supply combination through the communication module, and the output end voltage of the power supply combination is used as the reference voltage; the difference between the reference voltage and the voltage of the output end of the DCDC module is calculated to obtain the difference voltage; the power value of the output end of the DCDC module is calculated by the voltage of the output end of the DCDC module and the current of the output end of the DCDC module; the difference power is calculated based on the power value of the output end of the DCDC module and the target power of the power supply combination; the difference current is calculated based on the difference power and the difference voltage, and the difference voltage and the difference current are respectively sent to the voltage loop n and the current loop n to control the DCDC module to achieve power stability and load balancing; the current loop n generates a feedback signal according to the difference current and sends it to the voltage loop n; the voltage loop n is used to generate a PWM signal to control the output end voltage of the DCDC module; the communication module and the single-chip computer are connected to the CAN communication bus for transmitting related instructions and data.

[0059] Applicable scenario 1: Figure 7 As shown in the figure, in the magnetic resonance and image processing laboratory, the magnetic resonance test area contains instruments (nuclear magnetic resonance instrument, high voltage generator, imaging equipment, etc.) with instantaneous high-power devices. The power system deployment is separated, and the distribution combination is deployed near the high-power area (magnetic resonance test area, data processing area). The distributed power supply system deploys three buses: "AC bus, DC bus, and CAN bus". The buses interconnect one 4KW, two 10KW power supply combination and distribution combination. Battery packs and auxiliary power supplies are equipped according to laboratory needs to achieve power supply capacity expansion. In terms of energy control, since instantaneous high-power devices are mainly distributed in the test area, during the power supply layout stage, the energy control balance initialization configuration of the power supply combination takes the test area power supply combination as the supply core, and the rated output power of the power supply combination 3 in the fire room area is controlled at 6KW through the host computer interface.

[0060] In summary, the present invention can realize real-time monitoring and control of power supply through the coordinated work of power distribution combination, power supply combination and DC output unit, ensuring stable and reliable power supply for various high-precision equipment in the laboratory; the power distribution combination can access the mains, generator and backup power supply as needed, and adjust the power supply source in real time to cope with the dynamic changes in the power demand of the power-consuming equipment; the power supply combination includes components such as AC filter module, PFC module, DC / DC module and output filter module, which can ensure that the output DC power is stable and reliable, and meet the high requirements of high-precision equipment for power quality; the distributed power supply and control system transmits control commands, status and data through a three-level control management architecture to achieve centralized control of the entire system. The power supply combinations are connected through a DC bus, which can achieve energy balance and power regulation, ensure the output power balance between each power supply combination, and can perform intelligent power regulation and energy distribution according to actual needs; the present invention effectively saves energy and improves the service life of the power supply, thereby realizing centralized power supply or distributed power supply.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A distributed power supply control system for a high-power laboratory, characterized in that: include: Power distribution combination, multiple power supply combination and multiple DC output units; The power distribution assembly, the multiple power supply assemblies and the multiple DC output units communicate with each other via a CAN bus; The power distribution assembly and the multiple power supply assemblies are connected via an AC bus; the output ends of the multiple power supply assemblies are connected via a DC bus; each power supply assembly is correspondingly connected to a DC output unit; The power distribution assembly is used to convert the input power of the power supply source into 220V AC power supply, and supply power to the power supply assembly through the AC bus; wherein the power supply source includes: mains power, generator and backup power supply; The power supply assembly is used to convert AC power into 26V to 29V DC power to supply power to the DC output unit; The DC output unit uses a bidirectional Buck-Boost power module to realize one DC input to multiple DC outputs to supply power to the electrical equipment; The input power supply of the power distribution combination includes: When the sum of the current output powers of all power supply combinations is greater than the rated output power of the AC power, the distribution combination is simultaneously connected to the AC power and the generator as input power; when the sum of the current output powers of all power supply combinations is greater than the sum of the rated output powers of the AC power and the generator, the distribution combination is simultaneously connected to the AC power, the generator and the backup power supply as input power; when the sum of the current output powers of all power supply combinations is less than the rated output power of the input power supply of the distribution combination, and when the output power required by the DC output unit corresponding to a certain power supply combination is greater than the rated output power of the power supply combination, the output voltage of the remaining power supply combinations is adjusted in the range of 26-29V, so that the remaining power supply combinations balance energy to the power supply combination through the DC bus until the output power requirement of the power supply combination is met.

2. A distributed power supply control system for a high-power laboratory according to claim 1, characterized in that: The power distribution combination includes: a power detection circuit, a state estimation unit, a mode control unit and a communication unit; the power detection circuit is used to collect output power information of the power distribution combination from the AC bus; the state estimation unit is used to calculate the difference between the output power of the power distribution combination and its rated power; the mode control unit is used to control the power distribution combination to access one or more of the mains, generator and backup power supply as a power supply source according to the difference calculated by the state estimation unit; the communication unit communicates with the state estimation unit, the mode control unit and the CAN bus to transmit relevant instructions and data.

3. A distributed power supply control system for a high-power laboratory according to claim 2, characterized in that: The backup power supply is a DC power supply source. When the power distribution combination needs to be connected to the backup power supply as a power supply source, the DC power output by the backup power supply must first be converted into AC power through the following current conversion module; the current conversion module includes: an inverter, an SPWM module, a DAC converter, a current loop, a voltage loop, an ADC converter, a single-chip microcomputer, a CAN unit and a power acquisition module; The input end of the inverter is connected to the output end of the backup power supply, which is used to convert direct current into alternating current; the output end of the inverter is connected to the AC bus; the ADC converter is used to collect the instantaneous voltage of the AC bus; the power acquisition module is used to collect power information of the AC bus; the single-chip microcomputer is used to calculate the effective voltage of the AC bus according to the power of the AC bus collected by the power acquisition module; the single-chip microcomputer is used to calculate the voltage difference between the effective voltage and the instantaneous voltage of the AC bus, and calculate the current difference according to the voltage difference and the expected power value, the expected power value is the sum of the current output power of all power supply combinations minus the sum of the rated output power of the mains and the generator, and the calculated voltage difference and current difference are sent to the voltage loop and the current loop respectively; the voltage loop generates a feedback signal based on the voltage difference and transmits it to the current loop; the output end of the current loop is connected to the input end of the DAC converter; the output end of the SPWM module is connected to the control end of the inverter, which is used to control the inverter; the single-chip microcomputer is connected to the CAN bus through the CAN unit, which is used to transmit relevant instructions and data.

4. A distributed power supply control system for a high-power laboratory according to claim 1, characterized in that: The power supply combination includes: an AC filter module, N PFC modules, N DC / DC modules, an output filter module, an output detection module, a power adjustment unit, a compensation control unit, an auxiliary power supply, a single chip microcomputer and a CAN communication module; The AC filter module is used to filter the input AC power, and the output end of the AC filter module is connected to the input end of the auxiliary power supply and the input end of N PFC modules; the output end of the auxiliary power supply is connected to the power regulation unit and the single-chip microcomputer for providing power; the power regulation unit is connected to the compensation control unit and the N PFC modules respectively; the N PFC modules and the N DC / DC modules together constitute N AC / DC modules for converting AC power into DC power; the output ends of the N DC / DC modules are connected to the input end of the output filter module for filtering the output DC power, and the output end of the output filter module is connected to the DC bus; the output detection module is used to detect the power of the DC bus; the output end of the output detection module is connected to the compensation control unit; the compensation control unit is connected to the power regulation unit; the power compensation unit is connected to the N DC / DC modules; the single-chip microcomputer is connected to the power regulation unit and the compensation control unit; the CAN communication module is connected to the auxiliary power supply, the power regulation unit, the Hall sensor, the single-chip microcomputer and the compensation control unit for transmitting related instructions and data.

5. A distributed power supply control system for a high-power laboratory according to claim 1, characterized in that: The DC output unit comprises: a plurality of DC output branches; each DC output branch comprises: a DCDC module, a current loop n, a voltage loop n, a single-chip microcomputer and a sampling module; the input end of the DCDC module is connected to a DC bus; the output end of the DCDC module is connected to an output load; the sampling module is used to collect the instantaneous current at the output end of the DCDC module through a Hall sensor and calculate the output voltage at the output end of the DCDC module through a loss resistor; The single-chip computer monitors and obtains the voltage value and current value of the output end of the DCDC module in real time, receives the output end voltage of the power supply combination and the target power of the power supply combination through the communication module, and the output end voltage of the power supply combination is used as the reference voltage; the difference between the reference voltage and the voltage of the output end of the DCDC module is calculated to obtain the difference voltage; the power value of the output end of the DCDC module is calculated by the voltage of the output end of the DCDC module and the current of the output end of the DCDC module; the difference power is calculated based on the power value of the output end of the DCDC module and the target power of the power supply combination; the difference current is calculated based on the difference power and the difference voltage, and the difference voltage and the difference current are respectively sent to the voltage loop n and the current loop n to control the DCDC module to achieve power stability and load balancing; the current loop n generates a feedback signal according to the difference current and sends it to the voltage loop n; the voltage loop n is used to generate a PWM signal to control the output end voltage of the DCDC module; the communication module and the single-chip computer are connected to the CAN communication bus for transmitting related instructions and data.

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