Redundant direct current power supply system, flexible switching method and electronic equipment

Abstract

The invention relates to the technical field of direct current power supply, and discloses a redundant direct current power supply system, a flexible switching method and electronic equipment, the system comprises a power grid power supply subsystem connected with a power grid, and the power grid power supply subsystem comprises an isolation transformer connected with the power grid and a phase control rectifying device connected with the isolation transformer; wherein the phase-controlled rectifying device is connected with an external direct-current load through a direct-current bus; the system further comprises a generator power supply subsystem, and the generator power supply subsystem comprises a power generation device and an uncontrolled rectifying device connected with the power generation device. Wherein the uncontrolled rectifying device is connected with an external direct-current load through a direct-current bus. The redundant power supply can be provided for the external direct current load, so that the requirement of uninterruptible power supply of the external direct current load is met; and flexible switching is realized while the requirement of uninterruptible power supply in external direct current load switching is met, and the problem of large voltage power fluctuation in the switching process is avoided.

Description

Technical Field

[0001] The present invention relates to the field of direct current power supply, and in particular to a redundant direct current power supply system, a flexible switching method and electronic equipment. Background Art

[0002] There are generally two ways of DC power supply at present. One is to use the power grid, and then supply it to the external DC load through phase-controlled rectification (or other AC / DC devices); the other way is to use a generator to generate three-phase AC power, rectify it into DC, and then provide it to the external DC load.

[0003] The method of using only generators for power supply has problems such as high noise, relatively high pollution, and low power generation efficiency. Although the method of using only grid power supply has high power generation efficiency, there are periods of grid maintenance or voltage fluctuations, and stable and reliable power supply cannot be guaranteed for key equipment.

[0004] Therefore, a new DC power supply method is urgently needed to solve the above-mentioned defects. Summary of the invention

[0005] In view of the above problems, the present invention provides a redundant DC power supply system, a flexible switching method and an electronic device, which can avoid the problem of large voltage and power fluctuations during the switching process and reduce the number of anti-reverse diodes used.

[0006] The present invention provides a redundant DC power supply system, comprising:

[0007] A power grid power supply subsystem connected to a power grid, the power grid power supply subsystem comprising an isolation transformer connected to the power grid and a phase-controlled rectifier connected to the isolation transformer; wherein the phase-controlled rectifier is connected to an external DC load via a DC bus, and when the power grid power supply subsystem is powered, a first AC power output from the power grid is input to the phase-controlled rectifier via the isolation transformer, so that the first AC power is converted by the phase-controlled rectifier into a first DC power, which is then input to the external DC load via the DC bus;

[0008] The generator power supply subsystem includes a power generation device and an uncontrolled rectifier connected to the power generation device; wherein the uncontrolled rectifier is connected to an external DC load via a DC bus, and when powered by the generator power supply subsystem, the power generation device outputs a second AC power to the uncontrolled rectifier, so that the uncontrolled rectifier converts the second AC power into a second DC power, which is then input to the external DC load via the DC bus.

[0009] Furthermore, the redundant DC power supply system further includes:

[0010] a first current sensor, a second current sensor, a third current sensor, a first voltage sensor, a second voltage sensor, and a third voltage sensor, wherein:

[0011] The first current sensor and the first voltage sensor are both connected to the output winding of the isolation transformer, and are used to detect the output current and output voltage of the isolation transformer respectively;

[0012] The second current sensor and the second voltage sensor are both connected to the DC bus and are used to detect the output current and output voltage of the DC bus respectively;

[0013] The third current sensor and the third voltage sensor are both connected to the output winding of the generator in the power generation device, and are used to detect the output current and output voltage of the generator respectively;

[0014] The power generation device is also connected to the second current sensor, the second voltage sensor, the third current sensor and the third voltage sensor respectively, so as to adjust the output power of the generator by obtaining the output current and output voltage of the DC bus, the output current and output voltage of the generator;

[0015] The phase-controlled rectifier device is also connected to the first current sensor, the first voltage sensor, the second current sensor and the second voltage sensor respectively, so as to adjust the output power of the phase-controlled rectifier device by obtaining the output current and output voltage of the isolation transformer and the output current and output voltage of the DC bus.

[0016] Furthermore, the power generation device includes a battery, an excitation controller and a generator, wherein:

[0017] A battery connected to the excitation controller to provide excitation power to the excitation controller;

[0018] The excitation controller is respectively connected to the generator, the second current sensor, the second voltage sensor, the third current sensor, and the third voltage sensor, and is used to control the generator to perform an excitation operation; and is used to obtain the output current and output voltage of the DC bus, the output current and output voltage of the generator, and adjust the excitation current according to the output current and output voltage of the DC bus, the output current and output voltage of the generator, so as to adjust the output power of the generator;

[0019] The excitation controller is connected to the DC bus through a power line, so as to provide excitation power to the excitation controller through the DC bus after the generator completes the excitation operation;

[0020] The generator is connected to the uncontrolled rectifier device and is used for outputting the second alternating current.

[0021] Furthermore, in the case where the generator is a brushless excitation generator, the excitation controller is connected to the DC bus through a power line, and is replaced by connecting the excitation controller to the output winding of the generator, so that after the generator completes the excitation operation, the excitation power is provided to the excitation controller through the generator.

[0022] Furthermore, if the power supply mode of the power grid is single-phase power supply, the phase-controlled rectifier circuit in the phase-controlled rectifier device includes a single-phase half-controlled bridge rectifier circuit; if the power supply mode of the power grid is three-phase power supply, the phase-controlled rectifier circuit in the phase-controlled rectifier device includes a three-phase half-controlled bridge rectifier circuit or a three-phase full-controlled bridge rectifier circuit.

[0023] The present invention provides a flexible switching method for a redundant DC power supply system. The method is implemented based on the above-mentioned redundant DC power supply system and is used to switch power supply from a power grid to power supply from a generator. The method comprises:

[0024] In response to receiving a generator power supply instruction, controlling the power generation device to start and adjusting the output power of the generator in the power generation device according to a preset first adjustment strategy;

[0025] When the output power of the generator is not less than a preset power threshold, the phase-controlled rectifier device is controlled to block the output pulse of the controllable rectifier element;

[0026] And, when the output power of the generator is equal to the external DC load power, the power generation device is controlled to stop adjusting the output power of the generator to complete the flexible switching.

[0027] Furthermore, the power generation device includes a battery, an excitation controller and a generator, and the steps of controlling the start-up of the power generation device include:

[0028] The excitation controller is charged through the battery;

[0029] After the excitation controller completes charging, the excitation controller controls the generator to perform the excitation starting operation. After the output voltage of the generator reaches the preset excitation target value voltage, it is determined that the generator has completed the excitation starting operation and the power generation device has completed starting.

[0030] Further, adjusting the output power of the generator in the power generation device according to the preset first adjustment strategy includes:

[0031] Determine the target output voltage of the generator according to the current output voltage of the DC bus;

[0032] The output voltage of the generator is adjusted according to the target output voltage of the generator through a preset adjustment method to adjust the output power of the generator.

[0033] The present invention also provides a flexible switching method for a redundant DC power supply system. The method is implemented based on the above-mentioned redundant DC power supply system and is used to switch the generator power supply to the grid power supply. The method includes:

[0034] In response to receiving a power supply instruction from a power grid, adjusting the output power of the phase-controlled rectifier device according to a preset second adjustment strategy;

[0035] When the output power of the phase-controlled rectifier device is not less than a preset power threshold, the power generation device is controlled to block the excitation output of the excitation controller;

[0036] And, when the output power of the phase-controlled rectifier device is equal to the external DC load power, the phase-controlled rectifier device is controlled to stop adjusting the output power to complete the flexible switching.

[0037] Further, adjusting the output power of the phase-controlled rectifier device according to a preset second adjustment strategy includes:

[0038] The phase control target voltage is set according to the current output voltage of the DC bus;

[0039] The output voltage of the phase-controlled rectifier device is adjusted according to the phase-control target voltage through a preset adjustment method to adjust the output power of the phase-controlled rectifier device.

[0040] The present invention also provides a computer-readable storage medium, wherein the computer program stored in the computer-readable storage medium implements the steps of the above method when executed by one or more processors.

[0041] The present invention also provides an electronic device, comprising a memory and one or more processors, wherein a computer program is stored in the memory, and when the computer program is executed by the one or more processors, the steps of the above method are executed.

[0042] The redundant DC power supply system, flexible switching method and electronic device provided by the present invention have at least the following features:

[0043] Beneficial effects:

[0044] (1) The system includes a grid power supply subsystem and a generator power supply subsystem, which can provide redundant power for external DC loads, thereby meeting the external DC load's demand for uninterrupted power supply; the grid power supply subsystem adopts a phase-controlled rectifier for rectification, which can ensure the stability of the voltage output of the phase-controlled rectifier through phase shift control. At the same time, compared with the four-quadrant rectification method, the phase-controlled rectification has the advantages of providing high power, high voltage, fewer components, and high reliability; in addition, the system adopts both phase-controlled rectification and uncontrolled rectification for DC grid connection, which can reduce the number of anti-reverse diodes.

[0045] (2) During the switching process between generator power supply and grid power supply, flexible switching is achieved while ensuring that the external DC load is powered on without interruption. During switching, the DC power supply load power and the output voltage of the DC bus can be tracked in real time, and the generator output target voltage or phase control target voltage can be set by increasing or decreasing the difference according to the output voltage of the DC bus. It has the characteristics of adaptive control and can avoid the problem of large voltage and power fluctuations during the switching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A schematic diagram of the structure of a redundant DC power supply system provided in one embodiment of the present invention;

[0048] Figure 2 A redundant DC power supply system circuit principle provided in one embodiment of the present invention Figure 1 ;

[0049] Figure 3 A redundant DC power supply system circuit principle provided in one embodiment of the present invention Figure 2 ;

[0050] Figure 4 A flowchart of a flexible switching method for a redundant DC power supply system provided in one embodiment of the present invention;

[0051] Figure 5 A flowchart of a flexible switching method for a redundant DC power supply system provided in another embodiment of the present invention;

[0052] Figure 6 A schematic diagram of the structure of an electronic device provided in one embodiment of the present invention;

[0053] Reference numerals:

[0054] Figures 1 to 3 In: 1-grid power supply subsystem, 101-isolation transformer, 102-phase-controlled rectifier, 2-generator power supply subsystem, 201-generator, 2011-battery, 2012-excitation controller, 20121-rectifier, 2013-generator, 202-uncontrolled rectifier, 3-DC bus, 4-external DC load, 5-first current sensor, 6-second current sensor, 7-third current sensor, 8-first voltage sensor, 9-second voltage sensor, 10-third voltage sensor;

[0055] Figure 6 In it: 600 - electronic device, 601 - processor, 602 - communication bus, 603 - user interface, 604 - communication interface, 605 - memory. DETAILED DESCRIPTION

[0056] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention. The "first", "second" and "third" used in the claims and description of the present invention are only for the purpose of convenience of distinction, have no special meaning, and are not intended to limit the present invention.

[0057] In one embodiment of the present invention, a redundant DC power supply system is provided. Figure 1 , the system includes:

[0058] A power grid power supply subsystem 1 connected to a power grid, the power grid power supply subsystem comprising an isolation transformer 101 connected to the power grid and a phase-controlled rectifier 102 connected to the isolation transformer 101; wherein the phase-controlled rectifier 102 is connected to an external DC load 4 via a DC bus 3, and when the power grid power supply subsystem 1 is powered, a first AC power output from the power grid is input to the phase-controlled rectifier 102 via the isolation transformer 101, so that the first AC power is converted into a first DC power by the phase-controlled rectifier 102 and then input to the external DC load 4 via the DC bus 3;

[0059] The generator power supply subsystem 2 includes a power generation device 201 and an uncontrolled rectifier device 202 connected to the power generation device 201, wherein the uncontrolled rectifier device 202 is connected to the external DC load 4 via a DC bus. When powered by the generator power supply subsystem, the power generation device 201 outputs a second AC power to the uncontrolled rectifier device 202, so that the uncontrolled rectifier device 202 converts the second AC power into a second DC power, which is then input to the external DC load 4 via the DC bus 3.

[0060] Specifically, the power grid refers to a power supply network consisting of substations, distribution stations, power lines (including cables) and other power supply facilities.

[0061] The redundant DC power supply system provided in this embodiment includes a grid power supply subsystem and a generator power supply subsystem, which can provide redundant power for external DC loads to meet the demand for uninterrupted power supply of external DC loads; a phase-controlled rectifier device is used for rectification in the grid power supply subsystem, and the voltage output stability of the phase-controlled rectifier device can be ensured through phase shift control. At the same time, compared with the four-quadrant rectification method, the phase-controlled rectification has the advantages of providing high power, high voltage, fewer devices, and high reliability; in addition, the system adopts the solution of phase-controlled rectification and uncontrolled rectification for DC grid connection at the same time, which can reduce the number of anti-reverse diodes.

[0062] In yet another embodiment of the present invention, see Figure 2The redundant DC power supply system further includes a first current sensor 5, a second current sensor 6, a third current sensor 7, a first voltage sensor 8, a second voltage sensor 9 and a third voltage sensor 10. Wherein:

[0063] The first current sensor 5 and the first voltage sensor 8 are both connected to the output winding of the isolation transformer 101, and are used to detect the output current and output voltage of the isolation transformer 101 respectively; the second current sensor 6 and the second voltage sensor 9 are both connected to the DC bus 3, and are used to detect the output current and output voltage of the DC bus 3 respectively; the third current sensor 7 and the third voltage sensor 10 are both connected to the output winding of the generator in the power generation device 201, and are used to detect the output current and output voltage of the generator respectively;

[0064] The power generation device 201 is also connected to the second current sensor 6, the second voltage sensor 9, the third current sensor 7 and the third voltage sensor 10 respectively. The power generation device 201 obtains the output current and output voltage of the DC bus 3, and the output current and output voltage of the generator from the second current sensor 6, the second voltage sensor 9, the third current sensor 7 and the third voltage sensor 10, so as to adjust the output power of the generator by the obtained output current and output voltage of the DC bus 3, and the output current and output voltage of the generator.

[0065] The phase-controlled rectifier device 102 is also connected to the first current sensor 5, the first voltage sensor 8, the second current sensor 6 and the second voltage sensor 9 respectively. The phase-controlled rectifier device 102 obtains the output current and output voltage of the isolation transformer 101 and the output current and output voltage of the DC bus 3 from the first current sensor 5, the first voltage sensor 8, the second current sensor 6 and the second voltage sensor 9, so as to adjust the output power of the phase-controlled rectifier device 102 by the obtained output current and output voltage of the isolation transformer 101 and the output current and output voltage of the DC bus 3.

[0066] It can be understood that the phase-controlled rectifier device 102 includes a controller and a phase-controlled rectifier circuit, and the phase-controlled rectifier circuit includes a controllable rectifier element (thyristor). If the power supply mode of the power grid is single-phase power supply, the phase-controlled rectifier circuit in the phase-controlled rectifier device 102 includes a single-phase half-controlled bridge rectifier circuit (see Figure 2 ); If the power supply mode of the power grid is three-phase power supply, the phase-controlled rectifier circuit in the phase-controlled rectifier device 102 includes a three-phase half-controlled bridge rectifier circuit or a three-phase full-controlled bridge rectifier circuit (see Figure 3). In addition, the controller is respectively connected to the first current sensor 5, the first voltage sensor 8, the second current sensor 6, the second voltage sensor 9 and the controllable rectifier element in the phase-controlled rectifier circuit, and is used to trigger and adjust the controllable rectifier element, control the phase angle of the controllable rectifier element at the moment of triggering and conducting, realize phase shift control, and ensure the output voltage stability of the phase-controlled rectifier device.

[0067] Furthermore, in one implementation, the power generation device 201 includes a battery 2011, an excitation controller 2012, and a generator 2013, wherein:

[0068] The storage battery 2011 is connected to the excitation controller 2012 for providing excitation power to the excitation controller 2012 .

[0069] The excitation controller 2012 is connected to the generator 2013, the second current sensor 6, the second voltage sensor 9, the third current sensor 7, and the third voltage sensor 10, respectively, and is used to control the generator to perform the excitation operation, and to obtain the output current and output voltage of the DC bus 3, the output current and output voltage of the generator 2013, and adjust the excitation current according to the output current and output voltage of the DC bus 3, the output current and output voltage of the generator 2013, so as to adjust the output power of the generator 2013. The excitation controller 2012 is connected to the DC bus 3 through the power line, so that the excitation power is provided to the excitation controller 2012 through the DC bus 3 after the generator 2013 completes the excitation operation (see Figure 2 ).

[0070] The generator 2013 is connected to the uncontrolled rectifier device 202 for outputting a second alternating current.

[0071] It is understandable that the excitation controller 2012 includes an excitation regulator and an excitation circuit, the excitation regulator is connected to a switch element in the excitation circuit, the excitation regulator controls the magnitude of the excitation current in the excitation circuit through the switch element, and the excitation circuit is connected to the excitation winding of the generator 2013. Specifically, the switch element may be an IGBT (Insulated Gate Bipolar Transistor) or a MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor), and technicians may select them according to actual needs, and the present invention does not limit this.

[0072] Furthermore, in the case where the generator is a brushless excitation generator, "the excitation controller is connected to the DC bus through the power line" can be replaced with "the excitation controller is connected to the output winding of the generator" so that the excitation power is provided to the excitation controller through the generator after the excitation operation of the generator is completed. Specifically, the excitation controller 2012 is provided with a rectifier 20121 and an isolation transformer T. The three-phase AC power output by the output winding of the generator first passes through the isolation transformer T, and then is input into the rectifier 20121 to be converted into DC power to supply the excitation circuit. For detailed connection relationship, see Figure 3 ,in, Figure 3 Emphasis is shown on Figure 2 The difference between Figure 2 The same components are omitted, such as the resistor R1, switch K, resistor R2, capacitor C and other components in the excitation controller 2012 Figure 3 More specifically, when the excitation power is provided to the excitation controller 2012 by the generator 2013, the switch element in the excitation circuit can be a MOS tube.

[0073] The redundant DC power supply system provided in this embodiment is provided with a voltage sensor and a current sensor. When the power is supplied by the power grid subsystem, the first DC power is output from the phase-controlled rectifier device for external DC load use. The phase-controlled rectifier device collects the output voltage and output current of the isolation transformer and the output voltage and output current of the DC bus at the same time, and can trigger and adjust the controllable rectifier element according to the synchronization signal. When the input power grid fluctuates, the output voltage of the phase-controlled rectifier device is ensured to be stable through phase shift control. When the power is supplied by the generator subsystem, the excitation controller controls the generator to perform the excitation operation, and the battery provides the excitation power. After the excitation operation is completed, the DC bus provides the excitation power. The excitation controller collects the output voltage and output current of the generator, and the output voltage and output current of the DC bus. When the load fluctuates, the DC bus voltage output is stabilized by adjusting the excitation current.

[0074] In another embodiment of the present invention, a flexible switching method for a redundant DC power supply system is provided. The method is implemented based on the above redundant DC power supply system and is used to switch power supply from the grid to power supply from a generator. Figure 4 As shown, the method comprises the following steps:

[0075] Step S401: in response to receiving a generator power supply instruction, controlling the power generation device to start and adjusting the output power of the generator in the power generation device according to a preset first adjustment strategy.

[0076] Specifically, the power generation device is connected to the host computer for communication, and in actual use, the host computer can send a generator power supply instruction to the power generation device.

[0077] In one implementation, the power generation device includes a battery, an excitation controller, and a generator.

[0078] The step of controlling the start-up of the power generation device in step S401 includes: charging the excitation controller through the battery, and after the excitation controller is charged, controlling the generator to perform the excitation operation through the excitation controller, and after the output voltage of the generator reaches the preset excitation target value voltage, determining that the generator has completed the excitation operation and the power generation device has completed the start-up.

[0079] Specifically, see Figure 2 , the capacitor C is charged by the battery. More specifically, the excitation controller includes a pre-charging resistor R1 and a switch K. When charging, the switch K is first opened, and the capacitor C is pre-charged through the pre-charging resistor R1, thereby reducing the impact current when powering on, and then the switch K is closed to continue charging. The technician can pre-set the charging time according to actual needs, and the present invention does not limit this.

[0080] It can be understood that the excitation controller controls the generator to perform an excitation operation, the excitation current gradually increases, and the generator output voltage gradually increases.

[0081] Furthermore, in this step, the excitation target voltage can be determined by the following formula:

[0082] U0= ac1 ×(100-Y)%

[0083] Among them, U ac1 is the rated output voltage of the generator, U0 is the excitation target voltage, and Y is a constant. Y is set by the technicians according to actual needs, and the present invention does not impose any limitation on this.

[0084] Furthermore, in one implementation, adjusting the output power of the generator in the power generation device according to the preset first adjustment strategy in step S401 includes the following steps:

[0085] Step S4011: determining the target output voltage of the generator according to the current output voltage of the DC bus;

[0086] Step S4012: adjusting the output voltage of the generator according to the target output voltage of the generator by a preset adjustment method to adjust the output power of the generator.

[0087] Specifically, the generator output target voltage is determined by the following formula:

[0088] U1= dc ×(100+X1)%

[0089] Among them, U1 is the target voltage of the generator output, U dcis the current output voltage of the DC bus, X1 is a constant, and X1 is set by technicians according to actual needs, and the present invention does not limit this.

[0090] The preset adjustment method includes: adjusting the output voltage of the generator through the PID (abbreviation of Proportional, Integral, Differential) adjustment method (also known as the proportional-integral-differential adjustment method), and controlling the output voltage rise rate of the generator to be no greater than the preset voltage rise rate threshold during adjustment, and controlling the output power rise rate of the generator to be no greater than the preset power rise rate threshold.

[0091] The preset voltage rise rate threshold value X2 and the preset power rise rate threshold value X3 are set by the technicians according to actual needs, and the present invention does not limit this. When performing PID adjustment, the generator output voltage rise rate (V / s) is set to be no greater than X2, and the generator output power rise rate (kW / s) is set to be no greater than X3.

[0092] Step S402: When the output power of the generator is not less than a preset power threshold, the phase-controlled rectifier device is controlled to block the output pulse of the controllable rectifier element; and when the output power of the generator is equal to the external DC load power, the power generation device is controlled to stop adjusting the output power of the generator to complete flexible switching.

[0093] Specifically, the preset power threshold is determined by the following formula:

[0094] P0= dc ×(100-Y)%

[0095] Among them, P0 is the preset power threshold, P dc is the external DC load power (the rated power of the external DC load), Y is a constant, and Y is set by the technicians according to actual needs, and the present invention does not impose any limitation on this.

[0096] More specifically, the phase-controlled rectifier device is controlled to block the output pulse of the controllable rectifier element, which can be achieved by controlling the controllable rectifier element (such as Figure 2 or Figure 3 This is achieved by changing the thyristor in the circuit from the on state to the off state.

[0097] The flexible switching method for a redundant DC power supply system provided in the present embodiment realizes flexible switching from grid power supply to generator power supply while ensuring uninterrupted power supply to external DC loads during the process of switching from grid power supply to generator power supply, thereby solving the problem of large voltage and power fluctuations during the switching process. During switching, the DC power supply load power and the output voltage of the DC bus can be tracked in real time, and the generator output target voltage is set by increasing or decreasing the difference according to the output voltage of the DC bus, thereby having the characteristics of adaptive control.

[0098] The present invention also provides a flexible switching method for a redundant DC power supply system, which is implemented based on the above redundant DC power supply system and is used to switch the generator power supply to the grid power supply, such as Figure 5 As shown, the method comprises the following steps:

[0099] Step S501: in response to receiving a power supply instruction from a power grid, adjusting the output power of the phase-controlled rectifier device according to a preset second adjustment strategy.

[0100] Specifically, the phase-controlled rectifier device is connected to the host computer for communication. In actual use, the host computer can issue a power supply instruction of the power grid to the phase-controlled rectifier device.

[0101] In one implementation, adjusting the output power of the phase-controlled rectifier device by presetting a second adjustment strategy includes the following steps:

[0102] Step S5011: setting a phase control target voltage according to the current output voltage of the DC bus;

[0103] Step S5012: adjusting the output voltage of the phase-controlled rectifier device according to the phase-control target voltage in a preset adjustment manner to adjust the output power of the phase-controlled rectifier device.

[0104] Specifically, the phase control target voltage is determined by the following formula:

[0105] U2= dc ×(100+X1)%

[0106] Among them, U2 is the phase control target voltage, dc is the current output voltage of the DC bus, X1 is a constant, and X1 is set by technicians according to actual needs, and the present invention does not limit this.

[0107] The preset adjustment method includes: adjusting the output voltage of the phase-controlled rectifier device through a PID (abbreviation of Proportional, Integral, Differential) adjustment method (that is, a proportional-integral-differential adjustment method), and controlling the output voltage rise rate of the phase-controlled rectifier device to be no greater than a preset voltage rise rate threshold during adjustment, and controlling the output power rise rate of the phase-controlled rectifier device to be no greater than a preset power rise rate threshold.

[0108] The preset voltage rise rate threshold value X2 and the preset power rise rate threshold value X3 are set by the technician according to actual needs, and the present invention does not limit this. When performing PID adjustment, the output voltage rise rate (V / s) of the phase-controlled rectifier device is set to be no greater than X2, and the output power rise rate (kW / s) of the phase-controlled rectifier device is set to be no greater than X3.

[0109] Step S502: When the output power of the phase-controlled rectifier device is not less than a preset power threshold, the power generation device is controlled to block the excitation output of the excitation controller; and when the output power of the phase-controlled rectifier device is equal to the external DC load power, the phase-controlled rectifier device is controlled to stop adjusting the output power to complete flexible switching.

[0110] Specifically, the preset power threshold is determined by the following formula:

[0111] P0= dc ×(100-Y)%

[0112] Among them, P0 is the preset power threshold, P dc is the external DC load power (the rated power of the external DC load), Y is a constant, and Y is set by the technicians according to actual needs, and the present invention does not impose any limitation on this.

[0113] More specifically, the control of the generator to block the excitation output of the excitation controller can be achieved by controlling the switch element (such as Figure 2 IGBT or Figure 3 The MOS tube in the circuit changes from the on state to the off state.

[0114] The flexible switching method of the redundant DC power supply system provided in the present embodiment realizes the flexible switching of the generator power supply to the grid power supply while ensuring the uninterrupted power supply to the external DC load during the process of switching the generator power supply to the grid power supply, solves the problem of large voltage and power fluctuations during the switching process, can track the DC power supply load power and the output voltage of the DC bus in real time during switching, and sets the phase control target voltage by increasing or decreasing the difference method according to the output voltage of the DC bus, and has the characteristics of adaptive control.

[0115] In another embodiment of the present invention, a computer program product is provided, which includes a computer program or instructions. When the computer program or instructions are executed by a processor, all or part of the steps of the method in the above method embodiment are implemented. This embodiment will not be repeated here.

[0116] Further, the computer program product may include one or more computer executable components configured to execute the embodiments when the program is run; the computer program product may also include a computer program tangibly contained on a readable medium, the computer program including program code for executing any method in the embodiments of the present invention. In such an embodiment, the computer program may be downloaded and installed from a network through a communication part, and / or installed from a removable medium.

[0117] In another embodiment of the present invention, a computer-readable storage medium is further provided. The computer program stored in the computer-readable storage medium, when executed by one or more processors, implements all or part of the steps of the method in the above method embodiment. This embodiment will not be repeated here.

[0118] In yet another embodiment of the present invention, an electronic device 600 is further provided. Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the electronic device 600 includes: at least one processor 601, at least one communication bus 602, a user interface 603, at least one external communication interface 604, and a memory 605. Among them, the communication bus 602 is configured to realize the connection and communication between these components. Among them, the user interface 603 may include a display screen, and the external communication interface 604 may include a standard wired interface and a wireless interface. A computer program is stored in the memory 605, and the memory 605 and one or more processors 601 are connected to each other in communication. When the computer program is executed by one or more processors, the processor 601 is configured to execute the computer program stored in the memory to implement all or part of the steps of the method in the above method embodiment, and this embodiment will not be repeated here.

[0119] The redundant DC power supply system, flexible switching method and electronic device provided by the present invention can provide redundant power supply for external DC loads, meet the demand of external DC loads for uninterrupted power supply, and realize flexible switching while meeting the demand of external DC loads for uninterrupted power supply. During switching, the power of DC power supply loads and the output voltage of DC bus can be tracked in real time, and the output target voltage of the generator or the phase control target voltage can be set by increasing or decreasing the difference according to the output voltage of the DC bus. The system has the characteristics of adaptive control and can avoid the problem of large voltage and power fluctuations during switching.

[0120] The various embodiments of the present invention are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0121] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A redundant DC power supply system, characterized in that: include: A power grid power supply subsystem connected to a power grid, the power grid power supply subsystem comprising an isolation transformer connected to the power grid and a phase-controlled rectifier connected to the isolation transformer; wherein the phase-controlled rectifier is connected to an external DC load via a DC bus, and when the power grid power supply subsystem is powered, a first AC power output by the power grid is input to the phase-controlled rectifier via the isolation transformer, so that the first AC power is converted by the phase-controlled rectifier into a first DC power, which is then input to the external DC load via the DC bus; A generator power supply subsystem, the generator power supply subsystem comprising a power generation device and an uncontrolled rectifier connected to the power generation device; wherein the uncontrolled rectifier is connected to the external DC load via the DC bus, and when powered by the generator power supply subsystem, the power generation device outputs a second AC power to the uncontrolled rectifier, so that the uncontrolled rectifier converts the second AC power into a second DC power, which is then input into the external DC load via the DC bus.

2. The redundant DC power supply system according to claim 1, characterized in that: Also includes: a first current sensor, a second current sensor, a third current sensor, a first voltage sensor, a second voltage sensor, and a third voltage sensor, wherein: The first current sensor and the first voltage sensor are both connected to the output winding of the isolation transformer, and are used to detect the output current and output voltage of the isolation transformer respectively; The second current sensor and the second voltage sensor are both connected to the DC bus, and are used to detect the output current and output voltage of the DC bus respectively; The third current sensor and the third voltage sensor are both connected to the output winding of the generator in the power generation device, and are used to detect the output current and output voltage of the generator respectively; The power generation device is further connected to the second current sensor, the second voltage sensor, the third current sensor and the third voltage sensor respectively, so as to adjust the output power of the generator by obtaining the output current and output voltage of the DC bus, the output current and output voltage of the generator; The phase-controlled rectifier device is also connected to the first current sensor, the first voltage sensor, the second current sensor and the second voltage sensor respectively, so as to adjust the output power of the phase-controlled rectifier device by obtaining the output current and output voltage of the isolation transformer and the output current and output voltage of the DC bus.

3. The redundant DC power supply system according to claim 2, characterized in that: The power generation device comprises a battery, an excitation controller and a generator, wherein: The storage battery is connected to the excitation controller and is used to provide excitation power to the excitation controller; The excitation controller is connected to the generator, the second current sensor, the second voltage sensor, the third current sensor, and the third voltage sensor, respectively, and is used to control the generator to perform an excitation operation; and is used to obtain the output current and output voltage of the DC bus, the output current and output voltage of the generator, and adjust the excitation current according to the output current and output voltage of the DC bus, the output current and output voltage of the generator, so as to adjust the output power of the generator; The excitation controller is connected to the DC bus through a power line, so as to provide excitation power to the excitation controller through the DC bus after the generator completes the excitation operation; The generator is connected to the uncontrolled rectifier device and is used to output the second alternating current.

4. The redundant DC power supply system according to claim 3, characterized in that: In the case where the generator is a brushless excitation generator, the excitation controller is connected to the DC bus through a power line, and is replaced by the excitation controller being connected to the output winding of the generator, so that the excitation power is provided to the excitation controller through the generator after the generator completes the excitation operation.

5. The redundant DC power supply system according to claim 1, characterized in that: If the power supply mode of the power grid is single-phase power supply, the phase-controlled rectifier circuit in the phase-controlled rectifier device includes a single-phase half-controlled bridge rectifier circuit; If the power supply mode of the power grid is three-phase power supply, the phase-controlled rectifier circuit in the phase-controlled rectifier device includes a three-phase half-controlled bridge rectifier circuit or a three-phase full-controlled bridge rectifier circuit.

6. A flexible switching method for a redundant DC power supply system, characterized in that: The method is implemented based on the redundant DC power supply system according to any one of claims 1 to 5, and is used to switch power supply from the grid to power supply from a generator, and the method comprises: In response to receiving a generator power supply instruction, controlling the generator to start and adjusting the output power of the generator in the generator according to a preset first adjustment strategy; When the output power of the generator is not less than a preset power threshold, controlling the phase-controlled rectifier device to block the output pulse of the controllable rectifier element; And, when the output power of the generator is equal to the external DC load power, the power generation device is controlled to stop regulating the output power of the generator to complete the flexible switching.

7. The flexible switching method of a redundant DC power supply system according to claim 6, characterized in that: The power generation device comprises a battery, an excitation controller and a generator, and the step of controlling the start-up of the power generation device comprises: Charging the excitation controller via the battery; After the excitation controller completes charging, the excitation controller controls the generator to perform an excitation starting operation. After the output voltage of the generator reaches a preset excitation target voltage, it is determined that the generator has completed the excitation starting operation and the power generation device has completed startup.

8. The flexible switching method of a redundant DC power supply system according to claim 6, characterized in that: The step of adjusting the output power of the generator in the power generation device according to the preset first adjustment strategy includes: Determine the target output voltage of the generator according to the current output voltage of the DC bus; The output voltage of the generator is adjusted according to the target output voltage of the generator in a preset adjustment manner to adjust the output power of the generator.

9. A flexible switching method for a redundant DC power supply system, characterized in that: The method is implemented based on the redundant DC power supply system according to any one of claims 1 to 5, and is used to switch power supply from a generator to power supply from a grid, and the method comprises: In response to receiving a power supply instruction from a power grid, adjusting the output power of the phase-controlled rectifier device according to a preset second adjustment strategy; When the output power of the phase-controlled rectifier device is not less than a preset power threshold, controlling the power generation device to block the excitation output of the excitation controller; And, when the output power of the phase-controlled rectifier device is equal to the external DC load power, the phase-controlled rectifier device is controlled to stop adjusting the output power to complete the flexible switching.

10. The flexible switching method of a redundant DC power supply system according to claim 9, characterized in that: The step of adjusting the output power of the phase-controlled rectifier device according to the preset second adjustment strategy includes: The phase control target voltage is set according to the current output voltage of the DC bus; The output voltage of the phase-controlled rectifier device is adjusted according to the phase-control target voltage in a preset adjustment manner to adjust the output power of the phase-controlled rectifier device.

11. A computer-readable storage medium, characterized in that: The computer program stored in the computer-readable storage medium, when executed by one or more processors, implements the steps of the method according to any one of claims 6 to 10.

12. An electronic device, characterized in that: The method comprises a memory and one or more processors, wherein a computer program is stored in the memory, and when the computer program is executed by the one or more processors, the steps of the method according to any one of claims 6 to 10 are performed.

Images