AC voltage stabilization equipment and signal power supply system

Abstract

The present invention discloses an AC voltage stabilizing device and a signal power supply system, and the present invention relates to the field of power supply control technology. The AC voltage stabilizing device includes: a conversion module, an isolation module, an inverter module, and a main control module. The main control module controls the signal conversion operation of the conversion module by converting the output voltage and a preset first reference voltage-current data, controls the isolation operation of the isolation module by isolating the output voltage and a preset second reference voltage-current data, and controls the signal inversion operation of the inverter module by inverting the input voltage, inverting the output voltage, inverting the output current, and a preset third reference voltage-current data. That is, the AC voltage stabilizing device of this embodiment can sample the signals of the input and output ends of the conversion module, the isolation module, and the inverter module respectively through the main control module, and adjust the output signals of each module through feedback regulation, thereby improving the overall voltage stabilization performance of the AC voltage stabilizing device.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply control, and in particular to an AC voltage stabilizing device and a signal power supply system. Background Art

[0002] Currently, in signal power supply systems such as railway transportation, AC voltage stabilization equipment is used to power resistive loads and reference nonlinear loads such as computers.

[0003] In related technologies, AC voltage stabilization equipment requires an isolation transformer for isolated power supply. However, because isolation transformers cannot meet the required tolerance for input signal voltage variations, the output signal's voltage and frequency are easily affected by input signal voltage variations, resulting in poor voltage stabilization performance. Therefore, improving the voltage stabilization performance of AC voltage stabilization equipment has become a pressing technical issue. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an AC voltage stabilizing device that can improve the voltage stabilizing performance of the AC voltage stabilizing device.

[0005] The present invention also provides a signal power supply system having the above-mentioned AC voltage stabilizing device.

[0006] According to an embodiment of the first aspect of the present invention, an AC voltage stabilizing device is applied to a signal power supply system, wherein the signal power supply system is electrically connected to an AC signal source; the AC voltage stabilizing device comprises:

[0007] a conversion module, the conversion module being electrically connected to the AC signal source; wherein the AC signal source is used to provide an initial AC signal, and the output terminal voltage of the conversion module is a conversion output voltage;

[0008] an isolation module, the isolation module being electrically connected to the conversion module; wherein the output terminal voltage of the isolation module is an isolated output voltage;

[0009] An inverter module, the inverter module being electrically connected to the isolation module and the subsequent load, respectively; wherein the input terminal voltage of the inverter module is an inverter input voltage, the output terminal voltage of the inverter module is an inverter output voltage, and the output terminal current of the inverter module is an inverter output current;

[0010] A main control module, the main control module is electrically connected to the conversion module, the isolation module, and the inverter module respectively; the main control module is used to generate a conversion control signal according to the conversion output voltage and a preset first reference voltage and current data, the main control module is used to generate an isolation control signal according to the isolated output voltage and a preset second reference voltage and current data, and the main control module is used to generate an inverter control signal according to the inverter input voltage, the inverter output voltage, the inverter output current, and a preset third reference voltage and current data;

[0011] Among them, the conversion module is used to convert the initial AC signal into an initial DC signal according to the conversion control signal; the isolation module is used to perform an isolation operation on the initial DC signal according to the isolation control signal to obtain a target DC signal; and the inversion module is used to convert the target DC signal into a target AC signal according to the inversion control signal.

[0012] According to the AC voltage stabilizing device of the embodiment of the present invention, there are at least the following beneficial effects: the main control module controls the signal conversion operation of the conversion module by converting the output voltage and the preset first reference voltage-current data, controls the isolation operation of the isolation module by isolating the output voltage and the preset second reference voltage-current data, and controls the signal inversion operation of the inverter module by inverting the input voltage, the inverter output voltage, the inverter output current, and the preset third reference voltage-current data. That is, the AC voltage stabilizing device of this embodiment can sample the signals at the input and output ends of the conversion module, the isolation module, and the inverter module respectively through the main control module, and adjust the output signals of each module through feedback regulation, thereby improving the overall voltage stabilization performance of the AC voltage stabilizing device.

[0013] According to some embodiments of the present invention, the main control module includes: a first voltage loop, a first current loop, and a multiplier, wherein the first input terminal of the multiplier is electrically connected to the output terminal of the first voltage loop, and the output terminal of the multiplier is electrically connected to the first input terminal of the first current loop; the conversion module includes:

[0014] a first rectifier unit, wherein an input end of the first rectifier unit is electrically connected to the AC signal source, and the first rectifier unit is used to convert the initial AC signal into a preliminary DC signal;

[0015] a first capacitor connected in parallel with the output terminal of the first rectifier unit, and electrically connected to the second input terminal of the multiplier;

[0016] a first inductor, the first inductor being electrically connected to the first rectifier unit, the isolation module, and an input end of the first current loop respectively;

[0017] a voltage-controlled current element, wherein a control end of the voltage-controlled current element is electrically connected to the output end of the first current loop, and a switch end of the voltage-controlled current element is electrically connected to a connection node between the first inductor and the first rectifier unit, and the first capacitor respectively;

[0018] a second capacitor connected in parallel with the switch end of the voltage-controlled current element, the second capacitor being also electrically connected to the input end of the first voltage loop, the voltage across the second capacitor being the converted output voltage;

[0019] Among them, the first voltage loop is used to generate a correction difference voltage based on the first reference voltage-current data and the converted output voltage, the multiplier is used to generate a first reference current based on the correction difference voltage and the voltage of the preliminary DC signal, the first current loop is used to generate a first pulse control signal based on the first reference current and the current of the first inductor, and the voltage-controlled current element is used to perform a power correction operation on the preliminary DC signal according to the first pulse control signal to obtain the initial DC signal.

[0020] According to some embodiments of the present invention, the main control module further includes: a second voltage loop; and the isolation module includes:

[0021] a first switch unit, the first switch unit being connected in parallel with the voltage-controlled current element, and the first switch unit being electrically connected to an output end of the second voltage loop;

[0022] a transformer unit, the transformer unit being electrically connected to the first switch unit;

[0023] a second rectifier unit, the second rectifier unit being electrically connected to the transformer unit and the input end of the second voltage loop, respectively, and the voltage at the output end of the second rectifier unit being the isolated output voltage;

[0024] In which, the second voltage loop is used to generate a second pulse control signal based on the second reference voltage-current data and the isolated output voltage; the first switch unit is used to convert the initial DC signal into a square wave signal according to the second pulse control signal, the transformer unit is used to generate a resonant output signal according to the square wave signal, and the second rectifier unit is used to generate the target DC signal according to the resonant output signal.

[0025] According to some embodiments of the present invention, the main control module further includes: a loop control unit, a third voltage loop, a second current loop, and a divider, wherein the loop control unit is electrically connected to a connection node between the subsequent load and the output end of the inverter module, an external communication bus, and an input end of the third voltage loop, the output end of the third voltage loop is electrically connected to the input end of the second current loop, the output end of the second current loop is electrically connected to the first input end of the divider, the external communication bus is further electrically connected to an external voltage stabilizing device, and the external voltage stabilizing device is used to provide external current limiting control data; the inverter module includes:

[0026] a third capacitor, the third capacitor being connected in parallel to the output terminal of the second rectifier unit, the third capacitor being electrically connected to the second input terminal of the divider, and the voltage across the third capacitor being the inverter input voltage;

[0027] a second switch unit, the second switch unit being electrically connected to the third capacitor and the output end of the divider respectively;

[0028] a second inductor, one end of the second inductor being electrically connected to the first output end of the second switch unit, and the second inductor being further electrically connected to the input end of the second current loop;

[0029] a third inductor, the third inductor being electrically connected to the other end of the second inductor and the subsequent load respectively;

[0030] a fourth capacitor, one end of the fourth capacitor being electrically connected to a connection node between the second inductor and the third inductor, the other end of the fourth capacitor being electrically connected to the second output end of the second switching unit, the fourth capacitor being further electrically connected to the input end of the third voltage loop, the voltage across the fourth capacitor being the inverter output voltage, and the output current of the fourth capacitor being the inverter output current;

[0031] Among them, the loop control unit is used to generate a loop control voltage based on the external current limiting control data, the third reference voltage-current data, and the inverter output current; the third voltage loop is used to generate a second reference current based on the loop control voltage, the inverter output current, and the inverter output voltage; the second current loop is used to generate an inverter difference voltage based on the second reference current and the current of the second inductor; the divider is used to generate a third pulse control signal based on the inverter difference voltage, the inverter output voltage, and the inverter input voltage; the second switch unit is used to convert the target DC signal into the target AC signal according to the third pulse control signal.

[0032] According to some embodiments of the present invention, the external current limiting control data includes an external current limiting compensation voltage and an external current effective value, and the loop control voltage includes a droop reference voltage and a phase-locked reference voltage; the loop control unit includes:

[0033] a current limiting loop, the current limiting loop being electrically connected to the fourth capacitor and the external communication bus, respectively, and configured to generate a target current limiting compensation voltage according to the inverter output current and the external current limiting compensation voltage;

[0034] a current sharing loop, the current sharing loop being electrically connected to the fourth capacitor and the external communication bus, respectively, and configured to generate a target current sharing compensation voltage according to the inverter output current and the effective value of the external current;

[0035] an adder, wherein a first input end of the adder is electrically connected to the current limiting loop, a second input end of the adder is electrically connected to the current sharing loop, and the adder is used to generate a target reference voltage effective value according to the target current limiting compensation voltage, the target current sharing compensation voltage, and the third reference voltage-current data;

[0036] a droop loop, the droop loop being electrically connected to the fourth capacitor, the input end of the third voltage loop, and the output end of the adder, respectively, the droop loop being configured to generate the droop reference voltage according to the target reference voltage effective value, the inverter output voltage, the inverter output current, and the frequency of the target AC signal;

[0037] A phase-locked loop is electrically connected to the fourth capacitor, the input end of the third voltage loop, and the output end of the adder respectively, and the phase-locked loop is used to generate the phase-locked reference voltage according to the inverter output voltage and the frequency of the target AC signal.

[0038] According to some embodiments of the present invention, the droop loop comprises:

[0039] a first integrator, the first integrator being electrically connected to the fourth capacitor, and the first integrator being configured to generate a first phase difference voltage pair according to the inverter output voltage;

[0040] a second integrator, the second integrator being electrically connected to the fourth capacitor, and the second integrator being configured to generate a phase difference current pair according to the inverter output current;

[0041] a power operation subunit, the power operation subunit being electrically connected to the first integrator and the second integrator respectively, and configured to perform power calculation based on the first phase difference voltage pair and the phase difference current pair to obtain active power and reactive power;

[0042] a frequency droop subunit, configured to calculate first phase angle reference data according to the active power and the frequency of the target AC signal;

[0043] an amplitude droop subunit, the amplitude droop subunit being configured to calculate and obtain first amplitude reference data according to the reactive power and the effective value of the target reference voltage;

[0044] A droop synthesis subunit is configured to generate the droop reference voltage according to the first phase angle reference data and the first amplitude reference data.

[0045] According to some embodiments of the present invention, the phase-locked loop includes:

[0046] a third integrator, the third integrator being electrically connected to the fourth capacitor, and configured to generate a second phase difference voltage pair according to the inverter output voltage;

[0047] a coordinate system conversion subunit, the coordinate system conversion subunit being electrically connected to the third integrator, and configured to generate a first rotating coordinate axis voltage and a second rotating coordinate axis voltage according to the second phase difference voltage pair;

[0048] a low-pass filtering subunit, the low-pass filtering subunit being electrically connected to the coordinate system conversion subunit, and configured to perform a low-pass filtering operation on the first rotating coordinate axis voltage to generate second amplitude reference data;

[0049] a phase-lock determination subunit, the phase-lock determination subunit being electrically connected to the coordinate system conversion subunit, and configured to perform a phase-lock determination operation on the second rotating coordinate axis voltage according to the frequency of the target AC signal to obtain second phase angle reference data;

[0050] A phase-locked synthesis subunit is electrically connected to the low-pass filtering subunit and the phase-locked judgment subunit respectively, and is used to generate the phase-locked reference voltage according to the second amplitude reference data and the second phase angle reference data.

[0051] According to some embodiments of the present invention, the current limiting loop includes:

[0052] a third current loop, the third current loop being electrically connected to the fourth capacitor, and the third current loop being configured to generate an initial current limiting compensation voltage according to the effective value of the inverter output current and a preset reference current limiting value;

[0053] A current limiting voltage processing subunit is configured to adjust a voltage value of the initial current limiting compensation voltage according to the external current limiting compensation voltage to obtain the target current limiting compensation voltage.

[0054] According to some embodiments of the present invention, the current sharing loop includes:

[0055] a subtractor electrically connected to the fourth capacitor, the subtractor configured to generate an initial current sharing compensation voltage according to an average value between the effective value of the inverter output current and the effective value of the external current and the effective value of the inverter output current;

[0056] A current sharing voltage processing subunit is electrically connected to the subtractor, and is used to limit the voltage value of the initial current sharing compensation voltage to obtain the target current sharing compensation voltage.

[0057] A signal power supply system according to a second aspect of an embodiment of the present invention includes:

[0058] N AC voltage stabilizing devices as described in the first aspect embodiment above, the AC voltage stabilizing devices are electrically connected to the AC signal source and the subsequent load, and any two of the AC voltage stabilizing devices are communicatively connected through an external communication bus; wherein N is a positive integer greater than or equal to 2.

[0059] The signal power supply system according to the embodiment of the present invention has at least the following beneficial effects: by adopting the above-mentioned AC voltage stabilizing device, the signal power supply system improves the overall voltage stabilizing performance of the AC voltage stabilizing device.

[0060] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0062] Figure 1 A block diagram of a specific embodiment of an AC voltage stabilizing device according to an embodiment of the present invention;

[0063] Figure 2 A circuit diagram of a specific embodiment of a conversion module according to an embodiment of the present invention;

[0064] Figure 3 A circuit schematic diagram of a specific embodiment of the isolation module according to an embodiment of the present invention;

[0065] Figure 4 This is a circuit diagram of a specific embodiment of the inverter module according to the present invention;

[0066] Figure 5 A circuit diagram of a specific embodiment of a droop loop according to an embodiment of the present invention;

[0067] Figure 6 A circuit diagram of a specific embodiment of a phase-locked loop according to an embodiment of the present invention;

[0068] Figure 7 A circuit diagram of a specific embodiment of a current limiting loop according to an embodiment of the present invention;

[0069] Figure 8 This is a circuit diagram of a specific embodiment of the current sharing loop according to an embodiment of the present invention;

[0070] Figure 9 FIG. 1 is a structural diagram of a specific embodiment of a signal power supply system according to an embodiment of the present invention.

[0071] Reference numerals:

[0072] AC signal source 100, conversion module 200, first rectifier unit 210, isolation module 300, first switch unit 310, first switch subunit 311, second switch subunit 312, third switch subunit 313, transformer unit 320, second rectifier unit 330, first rectifier subunit 331, second rectifier subunit 332, third rectifier subunit 333, inverter module 400, second switch unit 410, post-stage load 500, main control module 600, loop control unit 610, power operation subunit 621, frequency droop subunit 622, amplitude droop subunit 623, droop synthesis subunit 624, coordinate system conversion subunit 631, low-pass filter subunit 632, phase-locked judgment subunit 633, phase-locked synthesis subunit 634, current limiting voltage processing subunit 641, and current sharing voltage processing subunit 651. DETAILED DESCRIPTION

[0073] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0074] In the description of the present invention, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0075] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0076] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0077] Currently, in signal power supply systems such as railway transportation, AC voltage stabilization equipment is used to power resistive loads and reference nonlinear loads such as computers.

[0078] In related technologies, AC voltage stabilization equipment requires an isolation transformer for isolated power supply. However, because isolation transformers cannot meet the required tolerance for input signal voltage variations, the output signal's voltage and frequency are easily affected by input signal voltage variations, resulting in poor voltage stabilization performance. Therefore, improving the voltage stabilization performance of AC voltage stabilization equipment has become a pressing technical issue.

[0079] Based on this, the embodiments of the present disclosure provide an AC voltage stabilizing device and a signal power supply system, which can improve the voltage stabilizing performance of the AC voltage stabilizing device.

[0080] like Figure 1As shown, an embodiment of the present invention provides an AC voltage stabilizing device, which is applied to a signal power supply system, and the signal power supply system is electrically connected to an AC signal source 100. The AC voltage stabilizing device includes: a conversion module 200, an isolation module 300, an inverter module 400, and a main control module 600. The conversion module 200 is electrically connected to the AC signal source 100, wherein the AC signal source 100 is used to provide an initial AC signal, and the output terminal voltage of the conversion module 200 is a conversion output voltage; the isolation module 300 is electrically connected to the conversion module 200, wherein the output terminal voltage of the isolation module 300 is an isolation output voltage; the inverter module 400 is electrically connected to the isolation module 300 and the subsequent load 500, respectively, wherein the input terminal voltage of the inverter module 400 is an inverter input voltage, the output terminal voltage of the inverter module 400 is an inverter output voltage, and the output terminal current of the inverter module 400 is an inverter output current; the main control module 600 is electrically connected to the conversion module 200, the isolation module 300, and the inverter module 400, respectively; the main The control module 600 is used to generate a conversion control signal according to the conversion output voltage and the preset first reference voltage-current data. The main control module 600 is used to generate an isolation control signal according to the isolated output voltage and the preset second reference voltage-current data. The main control module 600 is used to generate an inverter control signal according to the inverter input voltage, the inverter output voltage, the inverter output current, and the preset third reference voltage-current data. Among them, the conversion module 200 is used to convert the initial AC signal into an initial DC signal according to the conversion control signal; the isolation module 300 is used to isolate the initial DC signal according to the isolation control signal to obtain the target DC signal; the inverter module 400 is used to convert the target DC signal into a target AC signal according to the inverter control signal.

[0081] Specifically, a plurality of AC voltage stabilizing devices can be configured in the signal power supply system. In the following embodiments, any one of the AC voltage stabilizing devices in the signal power supply system is used as an example for description. The AC signal source 100 can be a mains AC power supply, which provides an initial AC signal to the AC voltage stabilizing device in the form of a neutral line and a live line. The initial AC signal is a single-phase AC with a voltage range of 176V to 253V. Figure 1 The AC signal source 100 is electrically connected to the input of the conversion module 200, the input of the isolation module 300 is electrically connected to the output of the conversion module 200, the input of the inverter module 400 is electrically connected to the output of the isolation module 300, and the output of the inverter module 400 is electrically connected to the subsequent load 500. The controllable switch S can be a controllable switching device such as a relay or a thyristor, and is used for parallel current sharing.

[0082] The conversion module 200 , the isolation module 300 , and the inverter module 400 are electrically connected to the main control module 600 , respectively. The main control module 600 can sample the voltage and current signals at the input and output ends of the conversion module 200 , the isolation module 300 , and the inverter module 400 , respectively.

[0083] The main control module 600 obtains the converted output voltage at the output of the conversion module 200 and combines it with preset first reference voltage-current data to generate a conversion control signal. This conversion control signal provides feedback control over the conversion module 200. Based on the conversion control signal, the conversion module 200 converts the initial AC signal into an initial DC signal, which is then regulated in real time by feedback from the conversion control signal. The initial DC signal is 400V DC.

[0084] The main control module 600 obtains the isolated output voltage from the output terminal of the isolation module 300 and combines it with a preset second reference voltage-current data to generate an isolation control signal. This isolation control signal provides feedback control over the isolation module 300. Based on the isolation control signal, the isolation module 300 isolates the initial DC signal to generate a target DC signal, which is then regulated in real time by the feedback of the isolation control signal.

[0085] The main control module 600 obtains the inverter input voltage at the input of the inverter module 400 and the inverter output voltage at the output of the inverter module 400. It combines this voltage with a preset third reference voltage-current data to generate an inverter control signal. The inverter control signal provides feedback control over the inverter module 400. The inverter module 400 inverts the target DC signal based on the inverter control signal to generate a target AC signal. This target AC signal is regulated in real time by the feedback of the inverter control signal. The target AC signal is 220V AC.

[0086] According to the AC voltage stabilizing device of the embodiment of the present invention, the main control module 600 can sample the signals at the input and output ends of the conversion module 200, the isolation module 300, and the inverter module 400 respectively, and adjust the output signals of each module through feedback regulation, thereby improving the overall voltage stabilization performance of the AC voltage stabilizing device.

[0087] like Figure 2As shown, in some specific embodiments of the present invention, the main control module 600 includes: a first voltage loop VC1, a first current loop IC1, and a multiplier M1. The first input terminal of the multiplier M1 is electrically connected to the output terminal of the first voltage loop VC1, and the output terminal of the multiplier M1 is electrically connected to the first input terminal of the first current loop IC1. The conversion module 200 includes: a first rectifier unit 210, a first capacitor C1, a first inductor L1, a voltage control element Q0, and a second capacitor C2. The input end of the first rectifier unit 210 is electrically connected to the AC signal source 100, and the first rectifier unit 210 is used to convert the initial AC signal into a preliminary DC signal; the first capacitor C1 is connected in parallel to the output end of the first rectifier unit 210, and the first capacitor C1 is electrically connected to the second input end of the multiplier M1; the first inductor L1 is electrically connected to the first rectifier unit 210, the isolation module 300, and the input end of the first current loop IC1 respectively; the control end of the voltage control flow element Q0 is electrically connected to the output end of the first current loop IC1, and the switch end of the voltage control flow element Q0 is electrically connected to the connection node of the first inductor L1 and the first rectifier unit 210, and the first capacitor C1 respectively. The second capacitor C2 is connected in parallel with the switch end of the voltage-controlled current element Q0, and the second capacitor C2 is also electrically connected to the input end of the first voltage loop VC1. The voltage across the second capacitor C2 is the converted output voltage. The first voltage loop VC1 is used to generate a correction difference voltage based on the first reference voltage-current data and the converted output voltage. The multiplier M1 is used to generate a first reference current based on the correction difference voltage and the voltage of the preliminary DC signal. The first current loop IC1 is used to generate a first pulse control signal based on the first reference current and the current of the first inductor L1. The voltage-controlled current element Q0 is used to perform a power correction operation on the preliminary DC signal to obtain an initial DC signal.

[0088] Specifically, refer to Figure 2 The first rectifier unit 210 is a rectifier circuit consisting of four diodes. The anode of the first diode D1 is electrically connected to the cathode of the second diode D2, the cathode of the third diode D3 is electrically connected to the cathode of the first diode D1, the cathode of the fourth diode D4 is electrically connected to the anode of the third diode D3, and the anode of the fourth diode D4 is electrically connected to the anode of the second diode D2. The connection node between the first diode D1 and the second diode D2 is the first input terminal of the first rectifier unit 210, the connection node between the third diode D3 and the fourth diode D4 is the second input terminal of the first rectifier unit 210, the connection node between the first diode D1 and the third diode D3 is the first output terminal of the first rectifier unit 210, and the connection node between the second diode D2 and the fourth diode D4 is the second output terminal of the first rectifier unit 210.

[0089] The AC signal source 100 is electrically connected to the first input terminal and the second input terminal of the first rectifier unit 210. The first rectifier unit 210 performs a DC conversion operation on the received initial AC signal to convert the initial AC signal into a preliminary DC signal and outputs the preliminary DC signal to the subsequent stage.

[0090] The two ends of the first capacitor C1 are connected in parallel to the two output ends of the first rectifier unit 210. The first inductor L1 is electrically connected to the isolation module 300 and the first output end of the first rectifier unit 210, respectively. The first switch end of the voltage-controlled current element Q0 is electrically connected to the connection node between the first inductor L1 and the isolation module 300, and the second switch end of the voltage-controlled current element Q0 is electrically connected to the second output end of the first rectifier unit 210. The two ends of the second capacitor C2 are electrically connected in parallel to the two switch ends of the voltage-controlled current element Q0.

[0091] Both the first voltage loop VC1 and the first current loop IC1 are controlled using a proportional-integral (PI) controller. The converted output voltage includes the initial converted output voltage across the first capacitor C1 and the target converted output voltage across the second capacitor C2. The first reference voltage-current data is specifically a voltage reference value Vref_pfc, which is pre-set based on requirements. Before being input into the first voltage loop VC1, a signal subtraction operation is performed on the target converted output voltage and the preset first reference voltage-current data. This allows the first voltage loop VC1 to perform proportional-integral control based on the received signal subtraction result, outputting a corrected difference voltage to the first input of the multiplier M1.

[0092] Multiplier M1 performs a signal multiplication operation based on the corrected difference voltage received at its first input and the initial converted output voltage received at its second input to obtain a first reference current Iref_pfc. Before inputting the first reference current into the first current loop IC1, a signal subtraction operation is performed on the first reference current and the current Il_pfc of the first inductor L1. This allows the first current loop IC1 to perform proportional-integral control based on the result of the received signal subtraction operation, thereby outputting a first pulse control signal PWM1 to the control terminal of the voltage-controlled current element Q0. Specifically, the signal duty cycle of the first pulse control signal PWM1 varies with the result of the signal subtraction operation. After receiving the first pulse control signal PWM1, the voltage-controlled current element Q0 alternately turns on and off according to the first pulse control signal PWM1, thereby achieving power correction of the preliminary DC signal and obtaining the initial DC signal. The voltage of the initial DC signal ultimately output from the conversion module 200 can be 400V.

[0093] The output dynamic performance of the conversion module 200 can be improved through the dual closed-loop control of the voltage loop and the current loop.

[0094] like Figure 3As shown, in some specific embodiments of the present invention, the main control module 600 further includes: a second voltage loop VC2. The isolation module 300 includes: a first switch unit 310, a transformer unit 320, and a second rectifier unit 330. The first switch unit 310 is connected in parallel with the voltage-controlled current element Q0 and is electrically connected to the output end of the second voltage loop VC2. The transformer unit 320 is electrically connected to the first switch unit 310. The second rectifier unit 330 is electrically connected to the input ends of the transformer unit 320 and the second voltage loop VC2, respectively. The voltage at the output end of the second rectifier unit 330 is the isolated output voltage. The second voltage loop VC2 is used to generate a second pulse control signal based on the second reference voltage-current data and the isolated output voltage. The first switch unit 310 is used to convert the initial DC signal into a square wave signal based on the second pulse control signal. The transformer unit 320 is used to generate a resonant output signal based on the square wave signal. The second rectifier unit 330 is used to generate a target DC signal based on the resonant output signal.

[0095] Specifically, refer to Figure 3 The isolation module 300 is composed of a three-phase LLC resonant circuit. The first switch unit 310 is composed of six switch tubes, three inductors, and three capacitors, wherein two switch tubes, one inductor, and one capacitor can form a single-phase resonant switch subunit (such as Figure 3 The first switch subunit 311, the second switch subunit 312, and the third switch subunit 313 are all selected as field effect tubes. The transformer unit 320 includes three transformers, the first transformer T1 is electrically connected to the first switch subunit 311, the second transformer T2 is electrically connected to the second switch subunit 312, and the third transformer T3 is electrically connected to the third switch subunit 313. The second rectifier unit 330 includes six diodes, wherein a pair of diodes is electrically connected in the form of an anode of one diode and a cathode of another diode to form a rectifier unit (such as Figure 3 An input capacitor Cin may be provided at the input end of the isolation module 300, and an output capacitor Cout may be provided at the output end of the isolation module 300. The voltage across the output capacitor Cout is the isolated output voltage.

[0096] The second voltage loop VC2 is controlled using a proportional-integral controller (PI). The second reference voltage-current data is specifically a pre-set voltage reference value Vref_llc before being input into the second voltage loop VC2. A signal subtraction operation is performed on the isolated output voltage and the preset second reference voltage-current data. This allows the second voltage loop VC2 to perform proportional-integral control based on the result of the received signal subtraction operation, thereby outputting a second pulse control signal PWM2 to the control terminal of each switch in the first switching unit 310. The second pulse control signals PWM2 received by the first switching subunit 311, the second switching subunit 312, and the third switching subunit 313 have a phase difference of 120° and a duty cycle of 50%. The frequency of the signals varies with the result of the signal subtraction operation received by the second voltage loop VC2.

[0097] The first switching unit 310 converts the initial DC signal into a three-phase square wave signal based on the second pulse control signal PWM2. The transformer in the transformer unit 320 resonates on the primary side based on the square wave signal, thereby outputting a three-phase resonant output signal on the secondary side to the second rectifier unit 330. Finally, the second rectifier unit 330 rectifies the three-phase resonant output signals to obtain the target DC signal.

[0098] It can be seen that the isolation module 300 of this embodiment adopts the above-mentioned three-phase LLC resonant circuit topology structure, which can reduce the size and weight of the device while isolating it, and can meet industry standards in all aspects and achieve isolation while greatly reducing the weight and volume of the device.

[0099] like Figure 4As shown, in some specific embodiments of the present invention, the main control module 600 further includes: a loop control unit 610, a third voltage loop VC3, a second current loop IC2, and a divider M2; the inverter module 400 includes: a third capacitor C3, a second switch unit 410, a second inductor L2, a third inductor L3, and a fourth capacitor C4. The loop control unit 610 is electrically connected to the connection node between the subsequent load 500 and the output of the inverter module 400, an external communication bus, and the input of the third voltage loop VC3. The output of the third voltage loop VC3 is electrically connected to the input of the second current loop IC2, and the output of the second current loop IC2 is electrically connected to the first input of the divider M2. The external communication bus is also electrically connected to an external voltage stabilizing device, which is used to provide external current limiting control data. The third capacitor C3 is connected in parallel with the output end of the second rectifier unit 330, and the third capacitor C3 is electrically connected to the second input end of the divider M2. The voltage across the third capacitor C3 is the inverter input voltage. The second switch unit 410 is electrically connected to the third capacitor C3 and the output end of the divider M2, respectively. One end of the second inductor L2 is electrically connected to the first output end of the second switch unit 410, and the second inductor L2 is also electrically connected to the input end of the second current loop IC2. The third inductor L3 is electrically connected to the other end of the second inductor L2 and the subsequent load 500, respectively. One end of the fourth capacitor C4 is electrically connected to the connection node of the second inductor L2 and the third inductor L3, and the other end of the fourth capacitor C4 is electrically connected to the second output end of the second switch unit 410. The fourth capacitor C4 is also electrically connected to the third inductor L3. The input end of the pressure ring VC3 is electrically connected, the voltage across the four capacitors C4 is the inverter output voltage, and the output current of the four capacitors C4 is the inverter output current; wherein, the loop control unit 610 is used to generate a loop control voltage according to the external current limiting control data, the third reference voltage-current data, and the inverter output current; the third voltage loop VC3 is used to generate a second reference current according to the loop control voltage, the inverter output current, and the inverter output voltage; the second current loop IC2 is used to generate an inverter difference voltage according to the second reference current and the current of the second inductor L2; the divider M2 is used to generate a third pulse control signal according to the inverter difference voltage, the inverter output voltage, and the inverter input voltage; the second switch unit 410 is used to convert the target DC signal into a target AC signal according to the third pulse control signal.

[0100] Specifically, refer to Figure 4The second switch unit 410 consists of four switching transistors. The connection node between the first switching transistor Q21 and the second switching transistor Q22 serves as the first output terminal of the second switch unit 410. The connection node between the third switching transistor Q23 and the fourth switching transistor Q24 serves as the second output terminal of the second switch unit 410. The connection node between the first switching transistor Q21 and the third switching transistor Q23 serves as the first input terminal of the second switch unit 410. The connection node between the second switching transistor Q22 and the fourth switching transistor Q24 serves as the second input terminal of the second switch unit 410. The third capacitor C3 is connected in parallel with the two input terminals of the second switch unit 410. The second inductor L2 is electrically connected to the first output terminal of the second switch unit 410. The third inductor L3 is electrically connected to the second inductor L2 and the subsequent load 500 respectively. The subsequent load 500 is also electrically connected to the second output terminal of the second switch unit 410. One end of the fourth capacitor C4 is electrically connected to the connection node between the second inductor L2 and the third inductor L3. The other end of the fourth capacitor C4 is electrically connected to the second output terminal of the second switch unit 410.

[0101] The third voltage loop VC3 adopts a quasi-proportional resonant controller (G PRN ) for control, specifically, a quasi-proportional resonant controller with 1, 3, 5, or 7 times the fundamental frequency can be used (e.g. Figure 4 G in PR1 , G PR3 , G PR5 , G PR7 The second current loop IC2 is controlled by a proportional controller (P).

[0102] The loop control unit 610 communicates signal data with other AC voltage stabilizing devices (i.e., external voltage stabilizing devices) in the signal power system via an external communication bus. The loop control unit 610 obtains external current limiting control data from the external voltage stabilizing device and the inverter output current Io_inv from the fourth capacitor C4. Based on the external current limiting control data, the inverter output current Io_inv, and a preset third reference voltage-current data, the loop control unit 610 generates and transmits a loop control voltage Vdroop / Vpll to the third voltage loop VC3. The third reference voltage-current data is specifically a voltage reference value Vrms_ref that is pre-set based on requirements.

[0103] Before being input into the third voltage loop VC3, the inverter output current Io_inv is transformed using the virtual impedance transfer function Gvirtual, and a signal subtraction operation is performed on the transformation result and the loop control voltage Vdroop / Vpll. This causes the third voltage loop VC3 to perform quasi-proportional resonant control based on the result of the received signal subtraction operation, thereby outputting the second reference current Iref_inv to the input end of the second current loop IC2. Quasi-proportional resonant control can adopt quasi-proportional resonant control at 1, 3, 5, or 7 times the fundamental frequency to effectively suppress harmonics, thereby ensuring that the output results of the third voltage loop VC3 meet the harmonic content requirements under different operating conditions. After completing the quasi-proportional resonant control at the four fundamental frequencies, the output results of the four quasi-proportional resonant controllers can be summed through a summer to obtain the above-mentioned second reference current Iref_inv.

[0104] Before being input into the second current loop IC2, a signal subtraction operation is performed on the current Il_inv of the second inductor L2 and the second reference current Iref_inv, so that the second current loop IC2 performs proportional control based on the received signal subtraction result to output an inverted difference voltage. After the inverted difference voltage is added to the inverted output voltage Vc_inv, the signal addition result is sent to the input terminal of the divider M2. The divider M2 receives the above signal addition result and the inverted input voltage Vi_inv across the third capacitor C3 from its input terminal, and divides the signal addition result by the inverted input voltage Vi_inv to generate and send a third pulse control signal PWM3 to the four switching transistors of the second switching unit 410. After receiving the third pulse control signal PWM3, the four switching transistors alternately turn on and off according to the third pulse control signal PWM3, thereby achieving an inverting operation on the target DC signal, thereby obtaining the target AC signal.

[0105] like Figure 4As shown, in some specific embodiments of the present invention, the external current limiting control data includes an external current limiting compensation voltage and an external current effective value, the loop control voltage includes a droop reference voltage and a phase-locked reference voltage, and the loop control unit 610 includes: a current limiting loop, a current sharing loop, an adder M3, a droop loop, and a phase-locked loop. The current limiting loop is electrically connected to the fourth capacitor C4 and the external communication bus respectively, and the current limiting loop is used to generate a target current limiting compensation voltage according to the inverter output current and the external current limiting compensation voltage; the current sharing loop is electrically connected to the fourth capacitor C4 and the external communication bus respectively, and the current sharing loop is used to generate a target current sharing compensation voltage according to the inverter output current and the external current effective value; the first input terminal of the adder M3 is electrically connected to the current limiting loop, and the second input terminal of the adder M3 is electrically connected to the current sharing loop, and the adder M3 is used to generate a target current limiting compensation voltage, a target current sharing compensation voltage, The third reference voltage-current data generates a target reference voltage effective value; the droop loop is electrically connected to the fourth capacitor C4, the input end of the third voltage loop VC3, and the output end of the adder M3, respectively, and the droop loop is used to generate a droop reference voltage according to the target reference voltage effective value, the inverter output voltage, the inverter output current, and the frequency of the target AC signal; the phase-locked loop is electrically connected to the fourth capacitor C4, the input end of the third voltage loop VC3, and the output end of the adder M3, respectively, and the phase-locked loop is used to generate a phase-locked reference voltage according to the inverter output voltage and the frequency of the target AC signal.

[0106] Specifically, the current-limiting loop obtains the external current-limiting compensation voltage Volimit provided by an external voltage-stabilizing device via an external communication bus. Simultaneously, the inverter output current Io_inv is subjected to RMS calculation to obtain the local current RMS value Irms. The current-limiting loop generates a target current-limiting compensation voltage Vlimit based on the local current RMS value Irms and the external current-limiting compensation voltage Volimit, and transmits this target current-limiting compensation voltage Vlimit to the adder M3 and other AC voltage-stabilizing devices in the signal power system.

[0107] The current sharing loop obtains the external current RMS value Iorms provided by the external voltage regulator via the external communication bus. Based on the local current RMS value Irms and the external current RMS value Iorms, the current sharing loop generates the target current sharing compensation voltage Vsharing and sends it to the adder M3.

[0108] Adder M3 performs signal addition on the target current limiting compensation voltage Vlimit, the target current sharing compensation voltage Vsharing, and the third reference voltage-current data Vrms_ref to obtain the target reference voltage effective value Vrms_ref1. The droop loop performs a droop reference calculation based on the received target reference voltage effective value Vrms_ref1, the inverter output voltage Vc_inv, the inverter output current Io_inv, and the target AC signal frequency W, thereby obtaining the droop reference voltage Vdroop. The phase-locked loop performs a phase-locked reference calculation based on the received inverter output voltage Vc_inv and the target AC signal frequency W, thereby obtaining the phase-locked reference voltage Vpll.

[0109] like Figure 5 As shown, in some specific embodiments of the present invention, the droop loop includes: a first integrator SOGI1, a second integrator SOGI2, a power operation subunit 621, a frequency droop subunit 622, an amplitude droop subunit 623, and a droop synthesis subunit 624. The first integrator SOGI1 is electrically connected to the fourth capacitor C4, and the first integrator SOGI1 is used to generate a first phase difference voltage pair according to the inverter output voltage; the second integrator SOGI2 is electrically connected to the fourth capacitor C4, and the second integrator SOGI2 is used to generate a phase difference current pair according to the inverter output current; the power operation subunit 621 is electrically connected to the first integrator SOGI1 and the second integrator SOGI2 respectively, and the power operation subunit 621 is used to perform power calculation according to the first phase difference voltage pair and the phase difference current pair to obtain active power and reactive power; the frequency droop subunit 622 is used to obtain the first phase angle reference data according to the active power and the frequency of the target AC signal; the amplitude droop subunit 623 is used to obtain the first amplitude reference data according to the reactive power and the effective value of the target reference voltage; the droop synthesis subunit 624 is used to generate a droop reference voltage according to the first phase angle reference data and the first amplitude reference data.

[0110] Specifically, after receiving the inverter output voltage Vc_inv, the first integrator SOGI1 integrates the inverter output voltage Vc_inv to obtain a first phase difference voltage pair Vα1 and Vβ1 on the α and β axes with a phase difference of 90°. After receiving the inverter output current Io_inv, the second integrator SOGI2 integrates the inverter output current Io_inv to obtain a phase difference current pair Iα and Iβ on the α and β axes with a phase difference of 90°.

[0111] The power calculation subunit 621 receives the first phase difference voltage pair Vα1, Vβ1 and the phase difference current pair Iα, Iβ and calculates active power and reactive power. The active power calculation formula is Vα1*Iα+Vβ1*Iβ, and the reactive power calculation formula is Vα1*Iα-Vβ1*Iβ. After the power calculation is completed, the results are processed by a low-pass filter (LPF) to obtain the active power Q and reactive power P.

[0112] The frequency droop subunit 622 receives the active power Q and the frequency W of the target AC signal, and calculates the frequency droop calculation result through the frequency droop formula Wn*Q (n is the frequency droop coefficient). The frequency droop calculation result is then processed by the integrator I to obtain the first phase angle reference data theta1. The amplitude droop subunit 623 receives the reactive power P and the target reference voltage effective value Vrms_ref1, and calculates the frequency droop calculation result through the amplitude droop formula (m is the amplitude droop coefficient) calculate the first amplitude reference data Va_droop.

[0113] The droop synthesis subunit 624 receives the first phase angle reference data theta1 and the first amplitude reference data Va_droop, and synthesizes the first phase angle reference data theta1 and the first amplitude reference data Va_droop to obtain a droop reference voltage Vdroop, wherein the synthesis formula is Vdroop=Va_droop*sin(theta1).

[0114] like Figure 6 As shown, in some specific embodiments of the present invention, the phase-locked loop includes: a third integrator SOGI3, a coordinate system conversion subunit 631, a low-pass filtering subunit 632, a phase-locked judgment subunit 633, and a phase-locked synthesis subunit 634. The third integrator SOGI3 is electrically connected to the fourth capacitor C4, and the third integrator SOGI3 is used to generate a second phase difference voltage pair based on the inverter output voltage; the coordinate system conversion subunit 631 is electrically connected to the third integrator SOGI3, and the coordinate system conversion subunit 631 is used to generate a first rotating coordinate axis voltage and a second rotating coordinate axis voltage based on the second phase difference voltage pair; the low-pass filtering subunit 632 is electrically connected to the coordinate system conversion subunit 631, and the low-pass filtering subunit 632 is used to perform a low-pass filtering operation on the first rotating coordinate axis voltage to generate second amplitude reference data; the phase-locked judgment subunit 633 is electrically connected to the coordinate system conversion subunit 631, and the phase-locked judgment subunit 633 is used to perform a phase-locked judgment operation on the second rotating coordinate axis voltage based on the frequency of the target AC signal to obtain second phase angle reference data; the phase-locked synthesis subunit 634 is electrically connected to the low-pass filtering subunit 632 and the phase-locked judgment subunit 633 respectively, and the phase-locked synthesis subunit 634 is used to generate a phase-locked reference voltage based on the second amplitude reference data and the second phase angle reference data.

[0115] Specifically, after receiving the inverter output voltage Vc_inv, the third integrator SOGI3 integrates the inverter output voltage Vc_inv to obtain a second phase difference voltage pair Vα2 and Vβ2 on the α and β axes with a phase difference of 90°. The coordinate system conversion subunit 631 receives the second phase difference voltage pair Vα2 and Vβ2 and converts the second phase difference voltage pair Vα2 and Vβ2 on the α and β axes of the two-phase stationary coordinate system into the d and q axes of the two-phase rotating coordinate system. The voltage on the d axis is the first rotating coordinate axis voltage Vd, and the voltage on the q axis is the second rotating coordinate axis voltage Vq.

[0116] The low-pass filtering subunit 632 performs low-pass filtering on the first rotating coordinate axis voltage Vd using a low-pass filter (LPF) to obtain the second amplitude reference data Va_pll. The phase-lock determination subunit 633 first tracks and determines the value of the second rotating coordinate axis voltage Vq using a proportional-integral controller (PI). A determination that Vq is zero indicates successful phase lock. The output of the proportional-integral controller (PI) is then added to the frequency W of the target AC signal. The result of this addition is then integrated by the integral controller (I) to obtain the second phase angle reference data theta2.

[0117] The phase-locked synthesis subunit 634 receives the second phase angle reference data theta2 and the second amplitude reference data Va_pll, and synthesizes the second phase angle reference data theta2 and the second amplitude reference data Va_pll to obtain a phase-locked reference voltage Vpll, wherein the synthesis formula is Vpll=Va_pll*sin(theta2).

[0118] like Figure 7 As shown, in some specific embodiments of the present invention, the current limiting loop includes: a third current loop IC3 and a current limiting voltage processing subunit 641. The third current loop IC3 is electrically connected to the fourth capacitor C4. The third current loop IC3 is used to generate an initial current limiting compensation voltage based on the effective value of the inverter output current and a preset reference current limiting value; the current limiting voltage processing subunit 641 is used to adjust the voltage value of the initial current limiting compensation voltage based on the external current limiting compensation voltage to obtain a target current limiting compensation voltage.

[0119] Specifically, the third current loop IC3 is controlled by an integral controller (I). Before inputting the signal into the third current loop IC3, a signal subtraction operation is performed between the preset reference current limit value Ilimit and the local current effective value Irms. This allows the third current loop IC3 to perform integral control based on the result of the received signal subtraction operation, thereby obtaining an initial current limit compensation voltage.

[0120] The current limiting voltage processing subunit 641 limits the initial current limiting compensation voltage to a minimum value that is a negative value and a maximum value that is zero, thereby ensuring that the local current effective value Irms does not affect the compensation voltage when it is less than the reference current limiting value Ilimit, and the local current effective value Irms can begin to smoothly reduce the compensation voltage after it exceeds the reference current limiting value Ilimit.

[0121] After limiting the initial current-limiting compensation voltage, the external current-limiting compensation voltage Volimit provided by other AC voltage-stabilizing devices in the signal power system is obtained. The current initial current-limiting compensation voltage and the external current-limiting compensation voltage Volimit are compared, and the minimum value is taken as the target current-limiting compensation voltage Vlimit. This determination of the minimum compensation voltage avoids the problem of inrush current caused by large differences in the effective values ​​of the compensated voltages of the various AC voltage-stabilizing devices in the signal power system.

[0122] like Figure 8 As shown, in some specific embodiments of the present invention, the current sharing loop includes: a subtractor M4 and a current sharing voltage processing subunit 651. The subtractor M4 is electrically connected to the fourth capacitor C4 and is used to generate an initial current sharing compensation voltage based on the average value between the effective value of the inverter output current and the effective value of the external current, and the effective value of the inverter output current; the current sharing voltage processing subunit 651 is electrically connected to the subtractor M4 and is used to limit the voltage value of the initial current sharing compensation voltage to obtain a target current sharing compensation voltage.

[0123] Specifically, before being input to subtractor M4, the external current RMS value Iorms provided by the external voltage regulator is averaged with the local current RMS value Irms to obtain the average calculation result Iavr. Subtractor M4 performs a signal subtraction operation on the average calculation result Iavr and the local current RMS value Irms to obtain the initial current sharing compensation voltage.

[0124] After receiving the initial current-sharing compensation voltage, the current-sharing voltage processing subunit 651 applies error limits to the initial current-sharing compensation voltage, clearing any initial current-sharing compensation voltage below the preset current-sharing degree to zero, thereby preventing continuous regulation oscillation. The error-limited result is then processed by a proportional-integral controller, which then outputs the result of this proportional-integral process to ensure steady-state accuracy, thereby obtaining the target current-sharing compensation voltage, Vsharing.

[0125] like Figure 9As shown, an embodiment of the present invention further provides a signal power supply system, which includes N AC voltage stabilizing devices as described in any of the above embodiments, the AC voltage stabilizing devices are electrically connected to the AC signal source 100 and the post-stage load 500, and any two AC voltage stabilizing devices are communicatively connected through an external communication bus; wherein N is a positive integer greater than or equal to 2.

[0126] Specifically, refer to Figure 9 Each AC voltage stabilizing device is connected to an external communication bus, thereby enabling signal and data communication between the AC voltage stabilizing devices. Each AC voltage stabilizing device can communicate using the Controller Area Network (CAN) bus protocol. Each AC voltage stabilizing device is connected to the same set of output busbars via a live wire l and a neutral wire n. The target AC signal can be transmitted to the subsequent load 500 via the output busbars.

[0127] The basis for parallel connection of multiple AC voltage stabilizing devices is the use of the droop loop and phase-locked loop described in the above-mentioned embodiment. The droop loop achieves power balancing, thereby achieving current sharing. The phase-locked loop obtains the amplitude and phase information of the output bus voltage when a device starts first, and uses this information as the voltage reference for the voltage and current dual closed-loop. This information is only used when the AC voltage stabilizing device starts up. After successful phase lock, the AC voltage stabilizing device closes the controllable switch S, and all subsequent control is based on droop control.

[0128] It can be seen that the contents of the above-mentioned AC voltage stabilizing device embodiment are all applicable to the embodiments of this signal power supply system. The functions specifically implemented by the embodiments of this signal power supply system are the same as those of the above-mentioned AC voltage stabilizing device embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned AC voltage stabilizing device embodiment.

[0129] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. AC voltage stabilizing equipment, characterized in that, Applicable to a signal power supply system, the signal power supply system is electrically connected to an AC signal source; the AC voltage stabilizing device includes: a conversion module, the conversion module being electrically connected to the AC signal source; wherein the AC signal source is used to provide an initial AC signal, and the output terminal voltage of the conversion module is a conversion output voltage; an isolation module, the isolation module being electrically connected to the conversion module; wherein the output terminal voltage of the isolation module is an isolated output voltage; An inverter module, the inverter module being electrically connected to the isolation module and the subsequent load, respectively; wherein the input terminal voltage of the inverter module is an inverter input voltage, the output terminal voltage of the inverter module is an inverter output voltage, and the output terminal current of the inverter module is an inverter output current; A main control module, the main control module is electrically connected to the conversion module, the isolation module, and the inverter module respectively; the main control module is used to generate a conversion control signal according to the conversion output voltage and a preset first reference voltage and current data, the main control module is used to generate an isolation control signal according to the isolated output voltage and a preset second reference voltage and current data, and the main control module is used to generate an inverter control signal according to the inverter input voltage, the inverter output voltage, the inverter output current, and a preset third reference voltage and current data; The conversion module is used to convert the initial AC signal into an initial DC signal according to the conversion control signal; the isolation module is used to perform an isolation operation on the initial DC signal according to the isolation control signal to obtain a target DC signal; and the inversion module is used to convert the target DC signal into a target AC signal according to the inversion control signal. Wherein, the main control module includes: a first voltage loop, a first current loop, a multiplier, a second voltage loop, a loop control unit, a third voltage loop, a second current loop and a divider, the first input end of the multiplier is electrically connected to the output end of the first voltage loop, and the output end of the multiplier is electrically connected to the first input end of the first current loop; the loop control unit is electrically connected to the connection node between the subsequent load and the output end of the inverter module, the external communication bus, and the input end of the third voltage loop, the output end of the third voltage loop is electrically connected to the input end of the second current loop, the output end of the second current loop is electrically connected to the first input end of the divider, the external communication bus is also electrically connected to an external voltage stabilizing device, and the external voltage stabilizing device is used to provide external current limiting control data; The conversion module includes: a first rectifier unit, the input end of the first rectifier unit is electrically connected to the AC signal source, and the first rectifier unit is used to convert the initial AC signal into a preliminary DC signal; a first capacitor, the first capacitor is connected in parallel with the output end of the first rectifier unit, and the first capacitor is electrically connected to the second input end of the multiplier; a first inductor, the first inductor is electrically connected to the first rectifier unit, the isolation module, and the input end of the first current loop respectively; a voltage control flow element, the control end of the voltage control flow element is electrically connected to the output end of the first current loop, and the switch end of the voltage control flow element is electrically connected to the first inductor and the first capacitor respectively; a second capacitor, the a second capacitor connected in parallel with the switch end of the voltage-controlled current element, and further electrically connected to the input end of the first voltage loop, and the voltage across the second capacitor being the converted output voltage; wherein the first voltage loop is configured to generate a correction difference voltage based on the first reference voltage-current data and the converted output voltage, the multiplier is configured to generate a first reference current based on the correction difference voltage and the voltage of the preliminary DC signal, the first current loop is configured to generate a first pulse control signal based on the first reference current and the current of the first inductor, and the voltage-controlled current element is configured to perform a power correction operation on the preliminary DC signal based on the first pulse control signal to obtain the initial DC signal; The isolation module includes: a first switch unit, the first switch unit is connected in parallel with the voltage-controlled current element, and the first switch unit is electrically connected to the output end of the second voltage loop; a transformer unit, the transformer unit is electrically connected to the first switch unit; a second rectifier unit, the second rectifier unit is electrically connected to the input ends of the transformer unit and the second voltage loop, respectively, and the voltage at the output end of the second rectifier unit is the isolated output voltage; wherein the second voltage loop is used to generate a second pulse control signal according to the second reference voltage-current data and the isolated output voltage; the first switch unit is used to convert the initial DC signal into a square wave signal according to the second pulse control signal, the transformer unit is used to generate a resonant output signal according to the square wave signal, and the second rectifier unit is used to generate the target DC signal according to the resonant output signal; The inverter module includes: a third capacitor, the third capacitor is connected in parallel with the output end of the second rectifier unit, the third capacitor is electrically connected to the second input end of the divider, and the voltage across the third capacitor is the inverter input voltage; a second switch unit, the second switch unit is electrically connected to the third capacitor and the output end of the divider respectively; a second inductor, one end of the second inductor is electrically connected to the first output end of the second switch unit, and the second inductor is also electrically connected to the input end of the second current loop; a third inductor, the third inductor is electrically connected to the other end of the second inductor and the subsequent load respectively; a fourth capacitor, one end of the fourth capacitor is electrically connected to the connection node of the second inductor and the third inductor, the other end of the fourth capacitor is electrically connected to the second output end of the second switch unit, and the fourth capacitor is also electrically connected to the input end of the second current loop. The input end of the third voltage loop is electrically connected, the voltage across the two ends of the fourth capacitor is the inverter output voltage, and the output current of the fourth capacitor is the inverter output current; wherein, the loop control unit is used to generate a loop control voltage according to the external current limiting control data, the third reference voltage-current data, and the inverter output current; the third voltage loop is used to generate a second reference current according to the loop control voltage, the inverter output current, and the inverter output voltage; the second current loop is used to generate an inverter difference voltage according to the second reference current and the current of the second inductor; the divider is used to generate a third pulse control signal according to the inverter difference voltage, the inverter output voltage, and the inverter input voltage; the second switch unit is used to convert the target DC signal into the target AC signal according to the third pulse control signal.

2. The AC voltage stabilizing device according to claim 1, characterized in that: The external current limiting control data includes an external current limiting compensation voltage and an external current effective value; the loop control voltage includes a droop reference voltage and a phase-locked reference voltage; and the loop control unit includes: a current limiting loop, the current limiting loop being electrically connected to the fourth capacitor and the external communication bus, respectively, and configured to generate a target current limiting compensation voltage according to the inverter output current and the external current limiting compensation voltage; a current sharing loop, the current sharing loop being electrically connected to the fourth capacitor and the external communication bus, respectively, and configured to generate a target current sharing compensation voltage according to the inverter output current and the effective value of the external current; an adder, wherein a first input end of the adder is electrically connected to the current limiting loop, a second input end of the adder is electrically connected to the current sharing loop, and the adder is used to generate a target reference voltage effective value according to the target current limiting compensation voltage, the target current sharing compensation voltage, and the third reference voltage-current data; a droop loop, the droop loop being electrically connected to the fourth capacitor, the input end of the third voltage loop, and the output end of the adder, respectively, the droop loop being configured to generate the droop reference voltage according to the target reference voltage effective value, the inverter output voltage, the inverter output current, and the frequency of the target AC signal; A phase-locked loop is electrically connected to the fourth capacitor, the input end of the third voltage loop, and the output end of the adder respectively, and the phase-locked loop is used to generate the phase-locked reference voltage according to the inverter output voltage and the frequency of the target AC signal.

3. The AC voltage stabilizing device according to claim 2, characterized in that: The droop loop includes: a first integrator, the first integrator being electrically connected to the fourth capacitor, and the first integrator being configured to generate a first phase difference voltage pair according to the inverter output voltage; a second integrator, the second integrator being electrically connected to the fourth capacitor, and the second integrator being configured to generate a phase difference current pair according to the inverter output current; a power operation subunit, the power operation subunit being electrically connected to the first integrator and the second integrator respectively, and configured to perform power calculation based on the first phase difference voltage pair and the phase difference current pair to obtain active power and reactive power; a frequency droop subunit, configured to calculate first phase angle reference data according to the active power and the frequency of the target AC signal; an amplitude droop subunit, the amplitude droop subunit being configured to calculate and obtain first amplitude reference data according to the reactive power and the effective value of the target reference voltage; A droop synthesis subunit is configured to generate the droop reference voltage according to the first phase angle reference data and the first amplitude reference data.

4. The AC voltage stabilizing device according to claim 2, characterized in that: The phase-locked loop comprises: a third integrator, the third integrator being electrically connected to the fourth capacitor, and configured to generate a second phase difference voltage pair according to the inverter output voltage; a coordinate system conversion subunit, the coordinate system conversion subunit being electrically connected to the third integrator, and configured to generate a first rotating coordinate axis voltage and a second rotating coordinate axis voltage according to the second phase difference voltage pair; a low-pass filtering subunit, the low-pass filtering subunit being electrically connected to the coordinate system conversion subunit, and configured to perform a low-pass filtering operation on the first rotating coordinate axis voltage to generate second amplitude reference data; a phase-lock determination subunit, the phase-lock determination subunit being electrically connected to the coordinate system conversion subunit, and configured to perform a phase-lock determination operation on the second rotating coordinate axis voltage according to the frequency of the target AC signal to obtain second phase angle reference data; A phase-locked synthesis subunit is electrically connected to the low-pass filtering subunit and the phase-locked judgment subunit respectively, and is used to generate the phase-locked reference voltage according to the second amplitude reference data and the second phase angle reference data.

5. The AC voltage stabilizing device according to claim 2, characterized in that: The current limiting loop includes: a third current loop, the third current loop being electrically connected to the fourth capacitor, and the third current loop being configured to generate an initial current limiting compensation voltage according to the effective value of the inverter output current and a preset reference current limiting value; A current limiting voltage processing subunit is configured to adjust a voltage value of the initial current limiting compensation voltage according to the external current limiting compensation voltage to obtain the target current limiting compensation voltage.

6. The AC voltage stabilizing device according to claim 2, characterized in that: The current sharing loop includes: a subtractor electrically connected to the fourth capacitor, the subtractor configured to generate an initial current sharing compensation voltage according to an average value between the effective value of the inverter output current and the effective value of the external current and the effective value of the inverter output current; A current sharing voltage processing subunit is electrically connected to the subtractor, and is used to limit the voltage value of the initial current sharing compensation voltage to obtain the target current sharing compensation voltage.

7. Signal power supply system, characterized in that, include: N AC voltage stabilizing devices according to any one of claims 1 to 6, wherein the AC voltage stabilizing devices are electrically connected to an AC signal source and a subsequent load, and any two of the AC voltage stabilizing devices are communicatively connected via an external communication bus; wherein N is a positive integer greater than or equal to 2.

Images