A method for automatically balancing current, a method for controlling faults and a system

Abstract

The present invention relates to a current automatic balancing control method, a fault control method and a system. The current automatic balancing control method comprises: obtaining the maximum output power of each power supply and the highest voltage allowed by the load, setting the initial current given value of each power supply; calculating the threshold voltage and voltage adjustment width of each power supply; powering on the equipment, obtaining the real-time voltage of each power supply; establishing a current automatic balancing model for each power supply, obtaining the respective current given value; adjusting the current output of each power supply to the respective current given value obtained and outputting it. The present invention adopts an independent working structure of each power supply, each power supply is provided with a balancing control algorithm, collects the respective current and voltage data, and calculates the current given value to achieve the current balancing effect between the power supplies, does not need to set the master-slave mode, and does not need the coordinated control of the third-party detection circuit, effectively reduces the use cost, and can be applied to any load, with a wide range of applications and improved use compatibility.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply systems, and in particular to a current automatic balancing control method, a fault control method and a system. Background Art

[0002] High-voltage power grid-connected power supply can increase the output current of the power supply system to meet the needs of high-load equipment. However, due to the different internal resistance of each power supply, some power supplies will output at full load, and some power supplies will output 0 or very small current, thus losing the meaning of grid-connected power supply. There are many existing technologies and solutions. One is the master-slave control method, that is, one of them is selected as the host and the rest are slaves, and the host distributes the current of each one to achieve balance. The disadvantage of this method is that once the host is damaged, the system will not work, and the subsequent maintenance is troublesome. When the power supply is damaged and needs to be replaced, it is necessary to confirm the master-slave identity of each unit and set it. And the main control of the slave requires the establishment of additional hardware circuits, such as 485 communication, or feedback regulation circuits, etc., which increases the cost. Another method is to use a third-party hardware control circuit to coordinate and control the output current of each power supply to make it balanced. This solution solves the problem of setting the power supply in the master-slave mode and is set by a third-party circuit instead, but the disadvantage is that the control cost is increased, because the third party needs to control the working current of each power supply, that is, to establish a circuit connection with each power supply, and once the third-party detection circuit is damaged or fails, it means that the system will lose the balancing function.

[0003] Therefore, it is necessary to provide a current automatic balancing control method, a fault control method and a system that do not require setting a master-slave mode, each power supply works independently, and does not require coordinated control by a third-party detection circuit. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a current automatic balancing control method, a fault control method and a system.

[0005] The technical solution of the present invention is as follows:

[0006] A current automatic balancing control method, a fault control method and a system, the control method comprising:

[0007] S1: Get the maximum output power of each power supply and the maximum voltage allowed by the load , set the initial current setpoint for each power supply ;

[0008] S2: Calculate the threshold voltage of each power supply and voltage regulation width :

[0009] ;

[0010] S3: Power on the device and collect the real-time voltage of each power supply ;

[0011] S4: Each power supply establishes its own current automatic balancing model to obtain its own current given value :

[0012] ;

[0013] S5: Adjust the current output of each power supply to the current set value obtained by each And output.

[0014] As a further improvement of the present invention, the maximum output power of each of the power supplies are the same, the initial current given value of each power supply are the same.

[0015] As a further improvement of the present invention, the initial current given value The calculation is:

[0016] ,

[0017] in, is the rated current required by the load, and n is the number of power supplies in parallel.

[0018] As a further improvement of the present invention, the rated current of the power supply is ,satisfy:

[0019] .

[0020] A control system based on the above-mentioned current automatic balancing control method comprises a load and a plurality of power supplies for supplying power to the load, wherein the plurality of power supplies are connected in parallel to supply power to the load, wherein the power supply comprises an output terminal electrically connected to the load and a current balancing component electrically connected to the output terminal, wherein the current balancing component realizes a current given value output by each of the power supplies same.

[0021] As a further improvement of the present invention, the current balancing component includes a sampling module, a current balancing algorithm module and a control module. The sampling module is electrically connected to the current balancing algorithm module and the control module. The current balancing algorithm module is electrically connected to the control module, and the control module is electrically connected to the output end.

[0022] As a further improvement of the present invention, the control module is a closed-loop controller.

[0023] As a further improvement of the present invention, the sampling module includes a current sampling circuit and a voltage sampling circuit, and the voltage sampling circuit collects the real-time voltage of the output end. The current sampling circuit collects the real-time current of the output end and feeds it back to the control module.

[0024] As a further improvement of the present invention, the current balancing algorithm module is a computer or an industrial computer.

[0025] As a further improvement of the present invention, a circuit breaker is provided between the power supply and the load.

[0026] A fault control method based on the above-mentioned current automatic balancing control method, the fault control method comprising:

[0027] T1: Get the maximum output power of each power supply , get the maximum voltage allowed by the load , get the minimum load voltage value when the system has no power failure , get the lowest threshold voltage after a power failure occurs in the system , get the maximum output current value of each power supply , set the initial current setpoint for each power supply ;

[0028] T2: Power on the device and collect the real-time voltage of each power supply ;

[0029] T3: Each power supply establishes its own current compensation model to obtain its own given maximum current :

[0030] ;

[0031] T4: Calculate the threshold voltage of each power supply and voltage regulation width :

[0032] ;

[0033] T5: Each power supply establishes its own current automatic balancing model to obtain its own current given value :

[0034] ;

[0035] T6: Adjust the current output of each power supply to the current set value obtained by each And output.

[0036] A fault control system based on the above fault control method comprises a load and a plurality of power supplies for supplying power to the load, wherein the plurality of power supplies are connected in parallel to supply power to the load, wherein the power supply comprises an output terminal electrically connected to the load and a current sharing control algorithm component electrically connected to the output terminal, wherein the current sharing control algorithm component realizes a current given value output by each of the power supplies same.

[0037] As a further improvement of the present invention, the current equalization control algorithm component includes a sampling module, a current compensation algorithm module, a current balancing algorithm module and a control module. The sampling module is electrically connected to the current compensation algorithm module, the current balancing algorithm module and the control module. The current compensation algorithm module is electrically connected to the current balancing algorithm module, the current balancing algorithm module is electrically connected to the control module, and the control module is electrically connected to the output end.

[0038] As a further improvement of the present invention, the sampling module includes a current sampling circuit and a voltage sampling circuit, and the voltage sampling circuit collects the real-time voltage of the output end. And feed back to the current compensation algorithm module and the current balancing algorithm module, the current sampling circuit collects the real-time current of the output end and feeds back to the control module.

[0039] According to the present invention of the above scheme, the beneficial effects of the present invention are:

[0040] The present invention provides a current automatic balancing control method, a fault control method and a system. Each power supply is provided with a balancing control algorithm to collect respective current and voltage data and calculate respective current given values. To achieve the current balancing effect between the power supplies, each power supply works independently, there is no need to set the master-slave mode, and no third-party detection circuit coordination control is required, which effectively reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a flow chart of the current automatic balancing control method of the present invention;

[0042] Figure 2 It is a schematic diagram of the structure of the present invention;

[0043] Figure 3 It is a schematic diagram of the structure inside the power supply of the control system of the present invention;

[0044] Figure 4 is a flow chart of the fault control method of the present invention;

[0045] Figure 5 It is a schematic diagram of the structure inside the power supply of the fault control system of the present invention. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] See also Figure 1 The present invention provides a current automatic balancing control method, the control method comprising:

[0050] S1: Get the maximum output power of each power supply and the maximum voltage allowed by the load , set the initial current setpoint for each power supply , preferably, the maximum output power of each power supply The specifications of each power supply are the same, which can avoid collecting information for each power supply and calculating their respective initial current given values. , effectively simplifying the overall workflow and reducing the overall workload, and effectively improving the control of automatic current balancing control and the effect of current balancing control; since each power supply is connected in parallel to supply power to the load, the voltage of each power supply is the same, and the voltage of each power supply is the same as the voltage across the load, that is, the maximum operating voltage allowed by each power supply is the maximum voltage allowed by the load The rated current of different loads determines the initial current setting value of the power supply. Because it is a current sharing system, the output current of each power supply should be the same, that is, the initial current setting value of each power supply are the same, so the rated current of the load is the initial current given value of the power supply The product of the number of parallel power supplies, the initial current given value The calculation is:

[0051] ,

[0052] in, is the rated current required by the load, n is the number of power supplies in parallel; the rated current of the load For example, if the current is 100mA and five power supplies are connected in parallel, the initial current setting value of each power supply is 20mA;

[0053] In order for each power supply to work properly, the rated current of each power supply must be met. Both are greater than or equal to the initial current setting value , that is, satisfying:

[0054] .

[0055] S2: Calculate the threshold voltage of each power supply and voltage regulation width :

[0056] ;

[0057] Since the maximum output power of the power supply and the initial current given value has been determined and is a fixed value, so the threshold voltage of the power supply It is also possible to determine the voltage regulation width The maximum operating voltage allowed by the power supply The threshold voltage of the power supply The difference voltage between

[0058] S3: Power on the device and collect the real-time voltage of each power supply ;

[0059] S4: Each power supply establishes its own current automatic balancing model to obtain its own current given value :

[0060] ;

[0061] After the power supply is powered on, the current closed-loop controller of the high-voltage power supply starts to work, increasing the output current, initially according to The current closed loop controller will work, the output current of the high voltage power supply will increase, and the output voltage will also increase. The high voltage power supply detects the actual voltage value in real time. If it does not reach the threshold value, When the given amount given by the equilibrium algorithm is Keep the initial value unchanged, and let the current closed-loop controller close the output current to At this time, each power supply is working in a current closed loop state, and the current of each is balanced, and the balance value is ;

[0062] Once the actual voltage is detected Exceed When the current closed-loop controller is not working, the result is that the current value of each unit will be uncertain. Because it is grid-connected, the current allocated to each unit is uneven and depends on the internal resistance of the power supply. At this time, the given amount must be adjusted immediately, that is, to reduce , to make the current closed-loop controller work, so that the high-voltage power supply works in the current closed-loop state. According to the formula, the given quantity , it can be seen Always below ;

[0063] S5: Adjust the current output of each power supply to the current set value obtained by each And output, because the power supply is connected in parallel, the real-time voltage collected by each power supply are the same, the calculated current given value It is also the same, that is, it can ensure that the output current of each power supply is the same, realizing the balanced control of the power supply current of the power grid. Of course, the established current automatic balancing model can be applied to any load and has a wide range of applications.

[0064] The present invention adopts an independent working structure of each power supply, and each power supply is equipped with a balanced control algorithm to collect the current and voltage data of each power supply and calculate the current given value of each power supply. To achieve the current balancing effect between the power supplies, there is no need to set the master-slave mode, and no need for third-party detection circuit coordination control, which effectively reduces the cost of use, can be applied to any load, has a wide range of applications, and improves compatibility.

[0065] The present invention provides a first embodiment, where five power supplies power the same load and the specifications of each power supply are the same. According to the load characteristics, the parameters are set as follows:

[0066] Rated current of load =100mA;

[0067] Initial current setting value of power supply =20mA;

[0068] Maximum output power of the power supply =980W;

[0069] The maximum operating voltage allowed by the power supply =50KV;

[0070] Power supply threshold voltage =49KV;

[0071] Voltage regulation width =1KV;

[0072] After powering on, the initial detection found that the output current of each power supply is , that is, 20mA, real-time voltage It is 47KV, which does not reach the power supply threshold voltage At 49KV, each power supply is in a current balance state, but as the working conditions change, the load characteristics change, and the voltage will continue to rise. When the power supply threshold voltage is reached, Previously, the power supply was still in a current balancing state because the output capacity of the power supply was sufficient. However, once the voltage exceeded 49KV, the output capacity of the power supply would not be sufficient, resulting in different currents for each power supply. At this time, the current given value was calculated based on the current automatic balancing model. , mainly to reduce To make the power supply work within the allowable power range, because all power supplies are connected in parallel, the real-time voltage detected by each power supply are the same, so the current given value calculated by the current automatic balancing model is It is the same, realizing automatic current balancing control.

[0073] The present invention provides a second embodiment, where five power supplies power the same load and the specifications of each power supply are different. According to the load characteristics, the parameters are set as follows:

[0074] Rated current of load =100mA;

[0075] Initial current setting value of power supply =20mA;

[0076] Maximum output power of power supply 1 =980W;

[0077] Maximum output power of power supply 2 =1000W;

[0078] Maximum output power of power supply 3 =1100W;

[0079] Maximum output power of power supply 4 =1250W;

[0080] Maximum output power of power supply 5 =1400W;

[0081] The maximum operating voltage allowed by the power supply =50KV;

[0082] Since the maximum output power of the five power supplies are different, so the smallest maximum output power is selected To calculate the power supply threshold voltage , the power supply threshold voltage is calculated =49KV;

[0083] Voltage regulation width =1KV.

[0084] See also Figure 2 and Figure 3 The present invention provides a control system, including a load and a plurality of power supplies for supplying power to the load, wherein the plurality of power supplies are connected in parallel to supply power to the load, the power supply includes an output terminal electrically connected to the load and a current balancing component electrically connected to the output terminal, and the current balancing component realizes a current given value output by each power supply. Similarly, the current sharing components inside each power supply calculate their respective current setpoints The load is powered by the output terminal.

[0085] As an embodiment of the present invention, the current balancing component includes a sampling module, a current balancing algorithm module and a control module. The sampling module is electrically connected to the current balancing algorithm module and the control module. The current balancing algorithm module is electrically connected to the control module. The control module is electrically connected to the output end. The sampling module samples the system in real time and feeds back the sampling signal to the current balancing algorithm module and the control module. The current balancing algorithm module calculates the current given value according to the collected sampling signal. And set the current value The signal is transmitted to the control module, which obtains the output current value based on the signals fed back by the sampling module and the current balancing algorithm module, and supplies current to the load through the output end.

[0086] As an embodiment of the present invention, the control module is a closed-loop controller. Preferably, the control module adopts a software closed-loop controller, such as a PID controller. The sampling module includes a current sampling circuit and a voltage sampling circuit. The voltage sampling circuit collects the real-time voltage at the output end. And feed back to the current balancing algorithm module. The current sampling circuit collects the real-time current at the output end and feeds back to the control module. The current balancing algorithm module is a computer or industrial computer. It forms a feedback loop inside the power supply to realize current PID control, so that each power supply works in the current closed-loop mode, and finally provides balanced current to the load.

[0087] As an embodiment of the present invention, a circuit breaker is provided between the power supply and the load. When the load changes, the staff can reasonably increase or decrease the number of parallel power supplies by closing or disconnecting the circuit breaker between each power supply and the load according to the specific needs of the load, thereby improving the compatibility and practicality of the system. At the same time, when a power supply fails, the circuit breaker between the power supply and the load can be disconnected in time to make the power supply disconnected from the parallel state, thereby avoiding unnecessary impact on the overall power supply.

[0088] The existing automatic current balancing system for power supplies often fails to meet the expected output power requirements when one of the power supplies fails. For example, if a load has a rated current of 100mA and is driven by 5 power supplies, each of which receives 20mA, and if one of them fails, if the remaining 4 power supplies still output 20mA each, the output power requirements cannot be met, resulting in reduced system performance. The only option is to wait for maintenance personnel to replace the power supply. During this period of waiting for maintenance, this is fatal for some industries with high real-time requirements. The existing solution is usually to add a third-party detection circuit. When one of the power supplies is detected to fail, the third-party circuit calculates and finds that each of the remaining 4 power supplies should receive 100mA / 4=25mA, and then raises the current of the remaining 4 power supplies through communication or other interactive methods. This solution relies on third-party circuits, which increases costs, and does not help if the third-party detection circuit fails. Alternatively, some solutions are to set up a master-slave mode, set up a host and other slaves, to notify other power supplies to increase current, but the master-slave mode system relies on the host, and the power supply needs to be configured in master-slave mode, which is not conducive to maintenance, and once the host is damaged, it is useless.

[0089] See also Figure 4 The present invention provides a fault control method, the fault control method comprising:

[0090] T1: Get the maximum output power of each power supply , get the maximum voltage allowed by the load , get the minimum load voltage value when the system has no power failure , get the lowest threshold voltage after a power failure occurs in the system , get the maximum output current value of each power supply , set the initial current setpoint for each power supply , preferably, the maximum output power of each power supply The specifications of each power supply are the same, which can avoid collecting information for each power supply and calculating their respective initial current given values. , effectively simplifying the overall workflow and reducing the overall workload, and effectively improving the control of automatic current balancing control and the effect of current balancing control; since each power supply is connected in parallel to supply power to the load, the voltage of each power supply is the same, and the voltage of each power supply is the same as the voltage across the load, that is, the maximum operating voltage allowed by each power supply is the maximum voltage allowed by the load The rated current of different loads determines the initial current setting value of the power supply. Because it is a current sharing system, the output current of each power supply should be the same, that is, the initial current setting value of each power supply are the same, so the rated current of the load is the initial current given value of the power supply The product of the number of parallel power supplies, the initial current given value The calculation is:

[0091] ,

[0092] in, is the rated current required by the load, n is the number of power supplies in parallel; the rated current of the load For example, if the current is 100mA and five power supplies are connected in parallel, the initial current setting value of each power supply is 20mA;

[0093] In order for each power supply to work properly, the rated current of each power supply must be met. Both are greater than or equal to the initial current setting value , that is, satisfying:

[0094] .

[0095] T2: Power on the device and collect the real-time voltage of each power supply ;

[0096] T3: Each power supply establishes its own current compensation model to obtain its own given maximum current :

[0097] ;

[0098] Among them, the lowest threshold voltage after a power failure occurs in the system It means that when a power failure occurs, the voltage on the load will decrease. The system allows the lowest threshold voltage after the voltage decreases. When it is lower than this value, the maintenance personnel must be notified to replace the power supply, and the system will give an alarm. After the system is powered on, when there is no power failure, the real-time voltage of the power supply detected is Exceeds the minimum load voltage value , then the current is given by the maximum value That is the initial current given value of the power supply When one of the power supplies fails, the load voltage decreases. At this time, the real-time voltage of the power supply detected is Will be lower than the minimum load voltage value At this time, the current compensation model can reasonably adjust the current given maximum value of the power supply , so that the system has a buffer time after a power failure occurs, so that the system will not stop working or work unsatisfactory. When the number of power failures is large, the detected power supply real-time voltage Below the minimum threshold voltage If the system fails to work, the maintenance personnel should be notified in time for repair and replacement.

[0099] T4: Calculate the threshold voltage of each power supply and voltage regulation width :

[0100] ;

[0101] Since the maximum output power of the power supply and current given maximum value has been determined, so the threshold voltage of the power supply It is also possible to determine the voltage regulation width The maximum operating voltage allowed by the power supply The threshold voltage of the power supply The difference voltage between

[0102] T5: Each power supply establishes its own current automatic balancing model to obtain its own current given value :

[0103] ;

[0104] After the power supply is powered on, the current closed-loop controller of the high-voltage power supply starts to work, increasing the output current, initially according to The current closed loop controller will work, the output current of the high voltage power supply will increase, and the output voltage will also increase. The high voltage power supply detects the actual voltage value in real time. If it does not reach the threshold value, When the given amount given by the equilibrium algorithm is Keep the maximum value unchanged, and let the current closed-loop controller close the output current to At this time, each power supply is working in a current closed loop state, and the current of each is balanced, and the balance value is .

[0105] Once the actual voltage is detected Exceed When the current closed-loop controller is not working, the result is that the current value of each unit will be uncertain. Because it is grid-connected, the current allocated to each unit is uneven and depends on the internal resistance of the power supply. At this time, the given amount must be adjusted immediately, that is, to reduce , to make the current closed-loop controller work, so that the high-voltage power supply works in the current closed-loop state. According to the formula, the given quantity , it can be seen Always below ;

[0106] T6: Adjust the current output of each power supply to the current set value obtained by each And output, because the power supply is connected in parallel, the real-time voltage collected by each power supply are the same, the calculated current given value It is also the same, that is, it can ensure that the output current of each power supply is the same, realizing the balanced control of the power supply current of the power grid. Of course, the established current automatic balancing model can be applied to any load and has a wide range of applications.

[0107] The present invention provides a third embodiment, in which five power supplies supply the same load and the specifications of each power supply are the same. A power failure occurs during operation. Before the power failure occurs, the parameters are set as follows according to the load characteristics:

[0108] Rated current of load =100mA;

[0109] Initial current setting value of power supply =20mA;

[0110] The maximum power supply current is given =20mA;

[0111] Maximum output current of power supply =33mA;

[0112] Maximum output power of the power supply =980W;

[0113] The maximum operating voltage allowed by the power supply =50KV;

[0114] Minimum load voltage value when the system has no power failure =39KV;

[0115] The lowest threshold voltage after a power failure in the system =26KV;

[0116] Power supply threshold voltage =49KV;

[0117] Voltage regulation width =1KV.

[0118] When one power supply fails, only four power supplies are working. The load voltage will decrease. =34KV, calculate the maximum value of the power supply current according to the formula =25mA, it can be seen that it has exceeded the previously set 20mA. As the working conditions change, the voltage will fluctuate within a certain range, such as the voltage increases, but it will not be higher than , when the voltage increases, according to the formula will decrease moderately, but still be higher than =20mA, at this time Will float around 25mA, and then calculate Substitute the current automatic balancing model to obtain the current set value To achieve the current balancing effect between the power supplies;

[0119] When two power supplies fail, only three power supplies are working. The load voltage measured at this time is =26.5KV, calculate the maximum value of the power supply current according to the formula =32.5mA. Similarly, as the working conditions change, the voltage will also fluctuate within a certain range.

[0120] When three power supplies fail, the load voltage Lower than According to the formula, the maximum output current value of the power supply should be maintained =33mA current output, the system alarms and notifies the maintenance personnel to replace the power supply.

[0121] The present invention can set the corresponding , as well as , thus providing flexibility of use. Through the current compensation algorithm, the overall maximum output current can be increased after a power failure, thereby maintaining the output power without reduction, providing buffer time for system maintenance. Of course, even if one power supply is damaged, the power supply must be replaced according to system requirements to ensure the stability and reliability of the system.

[0122] See also Figure 2 and Figure 5The present invention provides a fault control system, comprising a load and a plurality of power supplies for supplying power to the load, wherein the plurality of power supplies are connected in parallel to supply power to the load, the power supply comprises an output terminal electrically connected to the load and a current sharing control algorithm component electrically connected to the output terminal, and the current sharing control algorithm component realizes a current given value output by each power supply Similarly, the current sharing control algorithm component inside each power supply calculates its own current set value The load is powered by the output terminal.

[0123] As an embodiment of the present invention, the current balancing control algorithm component includes a sampling module, a current compensation algorithm module, a current balancing algorithm module and a control module. The sampling module is electrically connected to the current balancing algorithm module and the control module. The current compensation algorithm module is electrically connected to the current balancing algorithm module, the current balancing algorithm module is electrically connected to the control module, and the control module is electrically connected to the output end. The sampling module samples the system in real time and feeds back the sampling signal to the current compensation algorithm module, the current balancing algorithm module and the control module. The current compensation algorithm module calculates the given maximum value of the power supply current based on the collected sampling signal. And the power supply current is given the maximum value Transmitted to the current balancing algorithm module, the current balancing algorithm module calculates the current given value based on the collected sampling signal And set the current value The signal is transmitted to the control module, which obtains the output current value based on the signals fed back by the sampling module and the current balancing algorithm module, and supplies current to the load through the output end.

[0124] As an embodiment of the present invention, the control module is a closed-loop controller. Preferably, the control module adopts a software closed-loop controller, such as a PID controller. The sampling module includes a current sampling circuit and a voltage sampling circuit. The voltage sampling circuit collects the real-time voltage at the output end. And feed back to the current balancing algorithm module, the current sampling circuit collects the real-time current at the output end and feeds back to the control module, the current compensation algorithm module is a computer or an industrial computer, and the current balancing algorithm module is a computer or an industrial computer. A feedback loop is formed inside the power supply to realize current PID control, so that each power supply works in the current closed-loop mode, and finally provides balanced current to the load.

[0125] As an embodiment of the present invention, a circuit breaker is provided between the power supply and the load. When the load changes, the staff can reasonably increase or decrease the number of parallel power supplies by closing or disconnecting the circuit breaker between each power supply and the load according to the specific needs of the load, thereby improving the compatibility and practicality of the system. At the same time, when a power supply fails, the circuit breaker between the power supply and the load can be disconnected in time to make the power supply disconnected from the parallel state, thereby avoiding unnecessary impact on the overall power supply.

[0126] In summary, the present invention provides a current automatic balancing control method, a fault control method and a system, which adopts an independent working structure of each power supply, and each power supply is provided with a balancing control algorithm to collect the current and voltage data of each power supply, and calculate the current given value of each power supply. To achieve the current balancing effect between the power supplies, there is no need to set the master-slave mode, and no need for third-party detection circuit coordination control, which effectively reduces the cost of use, and can be applied to any load, with a wide range of applications and improved compatibility; a feedback loop is formed inside the power supply to realize current PID control, so that each power supply works in the current closed-loop mode, and finally provides balanced current to the load; the staff can reasonably increase or decrease the number of parallel power supplies by closing or turning off the circuit breaker between each power supply and the load according to the specific needs of the load, thereby improving the compatibility and practicality of the system. At the same time, when a power supply fails, the circuit breaker between the power supply and the load can be turned off in time to make the power supply out of the parallel state, avoiding unnecessary impact on the overall power supply; through the current compensation algorithm, the overall maximum output current can be increased after the power supply fails, thereby maintaining the output power without reduction, providing buffer time for system maintenance, and improving the stability and reliability of the overall work.

[0127] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A current automatic balancing control method, characterized in that: The control method comprises: S1: Multiple power supplies are connected in parallel and supply power to the load to obtain the maximum output power of each power supply and the maximum voltage allowed by the load , set the initial current setpoint for each power supply ; S2: Calculate the threshold voltage of each power supply and voltage regulation width : ； S3: Power on the device and collect the real-time voltage of each power supply , the real-time voltage of the power supply is equal to the real-time voltage across the load; S4: Each power supply establishes its own current automatic balancing model to obtain its own current given value : ； satisfy ,and ≤ ; S5: Adjust the current output of each power supply to the current set value obtained by each And output; The rated current of the power supply is ,satisfy: 。 2. The current automatic balancing control method according to claim 1, characterized in that: The maximum output power of each of the power supplies are the same, the initial current given value of each power supply are the same.

3. The current automatic balancing control method according to claim 2, characterized in that: The initial current given value The calculation is: ， in, is the rated current required by the load, and n is the number of power supplies in parallel.

4. A control system based on the current automatic balancing control method according to any one of claims 1 to 3, characterized in that: The invention comprises a load and a plurality of power supplies for supplying power to the load, wherein the plurality of power supplies are connected in parallel to supply power to the load, wherein the power supply comprises an output terminal electrically connected to the load and a current balancing component electrically connected to the output terminal, wherein the current balancing component realizes a given current value output by each of the power supplies. same.

5. The control system according to claim 4, characterized in that: The current balancing component includes a sampling module, a current balancing algorithm module and a control module. The sampling module is electrically connected to the current balancing algorithm module and the control module. The current balancing algorithm module is electrically connected to the control module. The control module is electrically connected to the output end.

6. The control system according to claim 5, characterized in that: The control module is a closed-loop controller.

7. The control system according to claim 5, characterized in that: The sampling module includes a current sampling circuit and a voltage sampling circuit. The voltage sampling circuit collects the real-time voltage of the output end. The current sampling circuit collects the real-time current of the output end and feeds it back to the control module.

8. The control system according to claim 5, characterized in that: The current balancing algorithm module is a computer or an industrial computer.

9. The control system according to claim 4, characterized in that: A circuit breaker is provided between the power source and the load.

10. A fault control method based on the current automatic balancing control method according to any one of claims 1 to 3, characterized in that: The fault control method comprises: T1: Get the maximum output power of each power supply , get the maximum voltage allowed by the load , get the minimum load voltage value when the system has no power failure , get the lowest threshold voltage after a power failure occurs in the system , get the maximum output current value of each power supply , set the initial current setpoint for each power supply ; T2: Power on the device and collect the real-time voltage of each power supply ; T3: Each power supply establishes its own current compensation model to obtain its own given maximum current : ； T4: Calculate the threshold voltage of each power supply and voltage regulation width : ； T5: Each power supply establishes its own current automatic balancing model to obtain its own current given value : ； T6: Adjust the current output of each power supply to the current set value obtained by each And output.

11. A fault control system based on the fault control method according to claim 10, characterized in that: The invention comprises a load and a plurality of power supplies for supplying power to the load, wherein the plurality of power supplies are connected in parallel to supply power to the load, wherein the power supply comprises an output terminal electrically connected to the load and a current sharing control algorithm component electrically connected to the output terminal, wherein the current sharing control algorithm component realizes a current given value output by each of the power supplies. same.

12. The fault control system according to claim 11, characterized in that: The current balancing control algorithm component includes a sampling module, a current compensation algorithm module, a current balancing algorithm module and a control module. The sampling module is electrically connected to the current compensation algorithm module, the current balancing algorithm module and the control module. The current compensation algorithm module is electrically connected to the current balancing algorithm module. The current balancing algorithm module is electrically connected to the control module. The control module is electrically connected to the output end.

13. The fault control system according to claim 12, characterized in that: The sampling module includes a current sampling circuit and a voltage sampling circuit. The voltage sampling circuit collects the real-time voltage of the output end. And feed back to the current compensation algorithm module and the current balancing algorithm module, the current sampling circuit collects the real-time current of the output end and feeds back to the control module.

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