Power supply control device and phase-sensitive track system

Abstract

The application discloses a power supply control device and a phase-sensitive track system, and relates to the technical field of power supply control. The power supply control device comprises a conversion module, an isolation module, an inversion module and a main control module. The main control module controls signal conversion operation of the conversion module through conversion output voltage and preset first reference voltage and current data, controls isolation operation of the isolation module through isolation output voltage and preset second reference voltage and current data, and controls signal inversion operation of the inversion module through inversion input voltage, inversion output voltage, inversion output current and preset third reference voltage and current data. The power supply control device can sample zero-crossing signals of input and output signals of each module and external control devices through the main control module, feed back and adjust output signals, improve output voltage dynamic performance and voltage stabilization precision of the power supply control device, and reduce the volume and weight of the power supply control device.

Description

Technical Field

[0001] This invention relates to the field of power control technology, and in particular to a power control device and a phase-sensitive track system. Background Technology

[0002] Currently, in phase-sensitive track systems for railway transportation, power control equipment is used to supply power to the phase-sensitive track circuits. This power control equipment for the phase-sensitive track circuits consists of two sub-modules: a local side and a track side.

[0003] In related technologies, power control equipment requires isolation transformers for isolated power supply. However, the large size and weight of isolation transformers result in an excessively large size and weight for the entire phase-sensitive track system, hindering its functional expansion. Reducing the size and weight of the isolation transformer during design would decrease the dynamic performance and voltage regulation accuracy of the power control equipment's output voltage, thus failing to meet the performance specifications of the phase-sensitive track system. Therefore, providing a power control equipment that improves the dynamic performance and voltage regulation accuracy of the output voltage while maintaining a smaller size and weight has become an urgent technical problem to be solved. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a power control device that can improve the dynamic performance and voltage regulation accuracy of the output voltage while maintaining a small size and weight.

[0005] The present invention also proposes a phase-sensitive track system having the above-mentioned power control device.

[0006] According to a first aspect of the present invention, a power control device is applied to a phase-sensitive track system, the phase-sensitive track system including an external control device, the phase-sensitive track system being electrically connected to an AC signal source, the external control device being used to provide a zero-crossing signal; the power control device includes:

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

[0008] An isolation module is electrically connected to the conversion module; wherein the output voltage of the isolation module is an isolation output voltage.

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

[0010] The main control module is electrically connected to the conversion module, the isolation module, the inverter module, and the external control device. The main control module generates a conversion control signal based on the conversion output voltage and preset first reference voltage-current data; it also generates an isolation control signal based on the isolation output voltage and preset second reference voltage-current data; and it generates an inverter control signal based on the inverter input voltage, the inverter output voltage, the inverter output current, the zero-crossing signal, and preset third reference voltage-current data.

[0011] 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 isolate the initial DC signal according to the isolation control signal to obtain a target DC signal; and the inverter module is used to convert the target DC signal into a target AC signal according to the inverter control signal.

[0012] The power control device according to the embodiments of the present invention has at least the following beneficial effects: the main control module controls the signal conversion operation of the conversion module by changing the output voltage and the preset first reference voltage-current data, controls the isolation operation of the isolation module by the isolation output voltage and the preset second reference voltage-current data, and controls the signal inversion operation of the inverter module by the inverter input voltage, inverter output voltage, inverter output current and the preset third reference voltage-current data. That is, the power control device of this embodiment can sample the signals at the input and output terminals of the conversion module, the isolation module and the inverter module respectively, as well as the zero-crossing signals of other control devices in the phase-sensitive track system, through the main control module, and improve the dynamic performance and voltage regulation accuracy of the output voltage of the power control device through feedback adjustment, while reducing the size and weight of the power control device design.

[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] The first rectifier unit has its input terminal electrically connected to the AC signal source and is used to convert the initial AC signal into a preliminary DC signal.

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

[0016] The first inductor is electrically connected to the input terminals of the first rectifier unit, the isolation module, and the first current loop, respectively.

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

[0018] The second capacitor is connected in parallel with the switching terminal of the voltage control current element. The second capacitor is also electrically connected to the input terminal of the first voltage loop. The voltage across the second capacitor is the converted output voltage.

[0019] The first voltage loop is used to generate a correction difference voltage based on the first reference voltage-current data and the transformed output voltage. The multiplier is used to generate a first reference current based on the correction difference voltage and the voltage of the initial 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. The voltage-current control element is used to perform a power correction operation on the initial DC signal based on 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; the isolation module includes:

[0021] A first switching unit is connected in parallel with the voltage control current element, and the first switching unit is electrically connected to the output terminal of the second voltage loop;

[0022] Transformer unit, wherein the transformer unit is electrically connected to the first switch unit;

[0023] The second rectifier unit is electrically connected to the input terminals of the transformer unit and the second voltage loop, respectively, and the voltage at the output terminal of the second rectifier unit is the isolation output voltage.

[0024] 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 switching unit is used to convert the initial DC signal into a square wave signal based on the second pulse control signal; the transformer unit is used to generate a resonant output signal based on the square wave signal; and the second rectifier unit is used to generate the target DC signal based on 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. The loop control unit is electrically connected to the connection node of the downstream load and the output terminal of the inverter module, an external control device, and the input terminal of the third voltage loop. The output terminal of the third voltage loop is electrically connected to the input terminal of the second current loop, and the output terminal of the second current loop is electrically connected to the first input terminal of the divider. The external control device is also used to provide external current limiting control data. The inverter module includes:

[0026] The third capacitor is connected in parallel with the output terminal of the second rectifier unit and electrically connected to the second input terminal of the divider. The voltage across the third capacitor is the inverter input voltage.

[0027] The second switching unit is electrically connected to the third capacitor and the output terminal of the divider, respectively.

[0028] The second inductor has one end electrically connected to the first output terminal of the second switching unit, and the second inductor is also electrically connected to the input terminal of the second current loop.

[0029] The third inductor is electrically connected to the other end of the second inductor and the subsequent load.

[0030] The fourth capacitor has one end electrically connected to the connection node of the second inductor and the third inductor, and the other end electrically connected to the second output terminal of the second switching unit. The fourth capacitor is also electrically connected to the input terminal of the third voltage loop. The voltage across the fourth capacitor is the inverter output voltage, and the output current of the fourth capacitor is the inverter output current.

[0031] The loop control unit is used to generate a loop control voltage based on the zero-crossing signal, 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 differential 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 differential voltage, the inverter output voltage, and the inverter input voltage; and the second switching unit is used to convert the target DC signal into the target AC signal based on 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 effective value of the external current; the loop control voltage includes a droop reference voltage and a phase-locked loop reference voltage; the loop control unit includes:

[0033] A current limiting loop is electrically connected to the fourth capacitor and the external control device, respectively. The current limiting loop is used to generate a target current limiting compensation voltage based on the inverter output current and the external current limiting compensation voltage.

[0034] A current sharing loop is electrically connected to the fourth capacitor and the external control device, respectively. The current sharing loop is used to generate a target current sharing compensation voltage based on the inverter output current and the effective value of the external current.

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

[0036] A drooping loop is electrically connected to the fourth capacitor, the input terminal of the third voltage loop, the output terminal of the adder, and the external control device. The drooping loop is used to generate the drooping reference voltage based on the zero-crossing signal, the effective value of the target reference voltage, the inverter output voltage, the inverter output current, and the frequency of the target AC signal.

[0037] A phase-locked loop (PLL) is electrically connected to the fourth capacitor, the input terminal of the third voltage loop, the output terminal of the adder, and the external control device. The PLL is used to generate the PLL reference voltage based on the zero-crossing signal, the inverter output voltage, and the frequency of the target AC signal.

[0038] According to some embodiments of the present invention, the drooping loop includes:

[0039] A first integrator is electrically connected to the fourth capacitor and is used to generate a first phase difference voltage pair based on the inverter output voltage.

[0040] The second integrator is electrically connected to the fourth capacitor and is used to generate a phase difference current pair based on the inverter output current.

[0041] A power calculation subunit is electrically connected to the first integrator and the second integrator, respectively. The power calculation subunit is used 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 is used to calculate first phase angle reference data based on the zero-crossing signal, the active power, and the frequency of the target AC signal.

[0043] An amplitude droop subunit is used to calculate first amplitude reference data based on the reactive power and the effective value of the target reference voltage.

[0044] A drooping synthesis subunit is used to generate the drooping reference voltage based on 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, which is electrically connected to the fourth capacitor, is used to generate a second phase difference voltage pair based on the inverter output voltage;

[0047] A coordinate system transformation subunit is electrically connected to the third integrator. The coordinate system transformation subunit is used to generate a first rotating coordinate axis voltage and a second rotating coordinate axis voltage based on the second phase difference voltage.

[0048] A low-pass filter subunit is electrically connected to the coordinate system transformation subunit. The low-pass filter subunit is used to perform a low-pass filter operation on the voltage of the first rotating coordinate axis to generate second amplitude reference data.

[0049] A phase-locked judgment subunit is electrically connected to the coordinate system transformation subunit. The phase-locked judgment subunit is used to perform a phase-locked judgment operation on the voltage of the second rotating coordinate axis based on the frequency of the zero-crossing signal and the target AC signal to obtain the second phase angle reference data.

[0050] A phase-locked synthesis subunit is provided, which is electrically connected to the low-pass filter subunit and the phase-locked judgment subunit, respectively. The phase-locked synthesis subunit is used to generate the phase-locked reference voltage based on 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] The third current loop is electrically connected to the fourth capacitor. The third current loop 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.

[0053] A current-limiting voltage processing subunit is used to adjust 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, which is electrically connected to the fourth capacitor, 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.

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

[0057] A phase-sensitive orbital system according to a second aspect of the present invention includes:

[0058] The track-side control group includes at least two first control devices; wherein the first control devices are power control devices as described in the first aspect embodiment above, the first control devices are electrically connected to an AC signal source, the first control devices are electrically connected to the downstream load through a first output bus, the phase-consistent communication ports of any two first control devices communicate with phase-consistent zero-crossing signals through a first phase-consistent bus, and the data ports of any two first control devices communicate with data through a first communication data bus.

[0059] A local side control group includes at least two second control devices; wherein the second control devices are power control devices as described in the first aspect embodiment above, the second control devices are electrically connected to an AC signal source, the second control devices are electrically connected to the downstream load through a second output bus, the phase-consistent communication ports of any two second control devices communicate with phase-consistent zero-crossing signals through a second phase-consistent bus, and the data ports of any two second control devices communicate with data through a second communication data bus;

[0060] The phase difference communication port of the second control device communicates with the phase difference communication port of the first control device via a phase difference bus to exchange phase difference zero-crossing signals.

[0061] The phase-sensitive track system according to the embodiments of the present invention has at least the following beneficial effects: by adopting the above-mentioned power control device, the phase-sensitive track system improves the dynamic performance and voltage regulation accuracy of the output voltage of the power control device, while reducing the size and weight of the power control device design.

[0062] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0063] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0064] Figure 1 This is a module block diagram of a specific embodiment of the power control device of the present invention;

[0065] Figure 2 This is a schematic diagram of a specific embodiment of the phase-sensitive orbital system of the present invention;

[0066] Figure 3 This is a circuit schematic diagram of a specific embodiment of the transformation module of the present invention;

[0067] Figure 4 This is a circuit schematic diagram of a specific embodiment of the isolation module of the present invention;

[0068] Figure 5 This is a circuit diagram of a specific embodiment of the inverter module of the present invention;

[0069] Figure 6 This is a circuit diagram of a specific embodiment of the drooping loop of the present invention;

[0070] Figure 7 This is a circuit diagram of a specific embodiment of the phase-locked loop of the present invention;

[0071] Figure 8 This is a circuit diagram of a specific embodiment of the current-limiting loop of the present invention;

[0072] Figure 9 This is a circuit diagram of a specific embodiment of the current sharing loop of the present invention.

[0073] Figure label:

[0074] 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, downstream load 500, main control module 600, loop control unit 610, power calculation subunit 621, frequency droop subunit 622, amplitude droop subunit 623, droop synthesis subunit 624, coordinate system transformation subunit 631, low-pass filter subunit 632, phase-locked loop judgment subunit 633, phase-locked loop synthesis subunit 634, current limiting voltage processing subunit 641, current sharing voltage processing subunit 651. Detailed Implementation

[0075] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0076] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0077] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0078] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Currently, in phase-sensitive track systems for railway transportation, power control equipment is used to supply power to the phase-sensitive track circuits. This power control equipment for the phase-sensitive track circuits consists of two sub-modules: a local side and a track side.

[0080] In related technologies, power control equipment requires isolation transformers for isolated power supply. However, the large size and weight of isolation transformers result in an excessively large size and weight for the entire phase-sensitive track system, hindering its functional expansion. Reducing the size and weight of the isolation transformer during design would decrease the dynamic performance and voltage regulation accuracy of the power control equipment's output voltage, thus failing to meet the performance specifications of the phase-sensitive track system. Therefore, providing a power control equipment that improves the dynamic performance and voltage regulation accuracy of the output voltage while maintaining a smaller size and weight has become an urgent technical problem to be solved.

[0081] Based on this, the present disclosure provides a power control device and a phase-sensitive track system, which can improve the dynamic performance of the output voltage and the voltage regulation accuracy of the power control device while keeping the size and weight small.

[0082] like Figure 1As shown, this embodiment of the invention provides a power control device, which includes: a conversion module 200, an isolation module 300, an inverter module 400, and a main control module 600. This power control device is applied to a phase-sensitive track system, which includes an external control device. The phase-sensitive track system is electrically connected to an AC signal source 100, and the external control device is used to provide a zero-crossing signal. The conversion module 200 is electrically connected to the AC signal source 100, which provides the initial AC signal. The output voltage of the conversion module 200 is the converted output voltage. The isolation module 300 is electrically connected to the conversion module 200, and its output voltage is the isolation output voltage. The inverter module 400 is electrically connected to both the isolation module 300 and the downstream load 500. Its input voltage is the inverter input voltage, its output voltage is the inverter output voltage, and its output current is the 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. Block 600 is used to generate a conversion control signal based on the converted output voltage and preset first reference voltage-current data. Main control module 600 is used to generate an isolation control signal based on the isolated output voltage and preset second reference voltage-current data. Main control module 600 is used to generate an inverter control signal based on the inverter input voltage, inverter output voltage, inverter output current, zero-crossing signal, and preset third reference voltage-current data. Conversion module 200 is used to convert the initial AC signal into an initial DC signal based on the conversion control signal. Isolation module 300 is used to perform isolation operations on the initial DC signal based on the isolation control signal to obtain the target DC signal. Inverter module 400 is used to convert the target DC signal into a target AC signal based on the inverter control signal.

[0083] Specifically, the phase-sensitive track system includes an external control device, which can be the power control device of this embodiment, and this external control device is capable of providing a zero-crossing signal. The zero-crossing signal is a signal generated when the level of the AC signal output by the external control device is zero. The following embodiments use any power control device in the phase-sensitive track system as an example. The AC signal source 100 can be a mains AC power supply, which provides an initial AC signal to the power control device through a neutral wire and a live wire. The initial AC signal is a single-phase AC power supply with a voltage range of 176V to 253V. (Refer to...) Figure 1 The AC signal source 100 is electrically connected to the input terminal of the conversion module 200, the input terminal of the isolation module 300 is electrically connected to the output terminal of the conversion module 200, the input terminal of the inverter module 400 is electrically connected to the output terminal of the isolation module 300, and the output terminal of the inverter module 400 is electrically connected to the downstream load 500. The switch S can be a relay or a controllable switching device such as a thyristor, and the switch S is used for parallel current sharing.

[0084] The conversion module 200, isolation module 300, and inverter module 400 are electrically connected to the main control module 600. The main control module 600 can sample the voltage and current signals at the input and output terminals of the conversion module 200, isolation module 300, and inverter module 400 respectively.

[0085] The main control module 600 acquires the converted output voltage from the output terminal of the conversion module 200, and combines this converted output voltage with preset first reference voltage-current data to generate a conversion control signal. This conversion control signal enables feedback control of the conversion module 200. The conversion module 200 converts the initial AC signal into an initial DC signal according to the conversion control signal, and this initial DC signal is subject to real-time feedback regulation by the conversion control signal. The initial DC signal is 400V DC.

[0086] The main control module 600 acquires the isolation output voltage from the output terminal of the isolation module 300, and combines this isolation output voltage with preset second reference voltage-current data to generate an isolation control signal. The isolation control signal enables feedback control of the isolation module 300. The isolation module 300 performs isolation operations on the initial DC signal according to the isolation control signal to obtain the target DC signal, and this target DC signal is subject to real-time feedback regulation by the isolation control signal.

[0087] The main control module 600 acquires the inverter input voltage and inverter output voltage from the inverter module 400, and obtains the zero-crossing signal from the external control device from the zero-crossing signal bus. It combines the inverter input voltage, inverter output voltage, and zero-crossing signal with preset third reference voltage-current data to generate an inverter control signal. This inverter control signal enables feedback control of the inverter module 400. The inverter module 400 performs an inverter operation on the target DC signal according to the inverter control signal to obtain a target AC signal, and this target AC signal is subject to real-time feedback regulation by the inverter control signal.

[0088] According to the power control device of the present invention, the main control module 600 can sample the zero-crossing signals of other control devices in the phase-sensitive track system and the signals at the input and output terminals of the inverter module 400, respectively. The power control device can improve the dynamic performance of the output voltage and the voltage regulation accuracy through feedback adjustment, while reducing the size and weight of the power control device design.

[0089] The phase-sensitive orbital system is described below. For example... Figure 2As shown, this embodiment of the invention also provides a phase-sensitive track system, which includes: a track-side control group and a local-side control group. The track-side control group includes at least two first control devices. The first control devices employ power control devices as described in any of the above embodiments. The first control devices are electrically connected to an AC signal source 100 and to a downstream load 500 via a first output bus. The phase-consistent communication ports of any two first control devices communicate using phase-consistent zero-crossing signals via a first phase-consistent bus, and the data ports of any two first control devices communicate using data via a first communication data bus. The local control device... The side control group includes at least two second control devices; wherein, the second control devices are power control devices as described in any of the above embodiments, the second control devices are electrically connected to the AC signal source 100, the second control devices are electrically connected to the downstream load 500 through the second output bus, the phase-consistent communication ports of any two second control devices communicate phase-consistent zero-crossing signals through the second phase-consistent bus, and the data ports of any two second control devices communicate data through the second communication data bus; wherein, the phase difference communication port of the second control device and the phase difference communication port of the first control device communicate phase difference zero-crossing signals through the phase difference bus.

[0090] Specifically, the phase-sensitive track system consists of a local side and a track side. The local side needs to output 110V AC at 25Hz, and the track side needs to output 220V AC at 25Hz. Simultaneously, the phase of the local side output needs to lead the track side by 90°±5°. The phase-sensitive track system as a whole has two sub-beams, both using the same phase-sensitive track circuit power module, but their output buses are not connected together and their phases must remain consistent. Zero-crossing signals are divided into phase-consistent zero-crossing signals and phase-difference zero-crossing signals. A phase-consistent zero-crossing signal indicates that when the phase of the target AC signal for communication is the same (e.g., when the power control devices for communication are both the first control device on the track side), the signal triggered by the power control device is zero. Conversely, a phase-difference zero-crossing signal indicates that when the phase of the target AC signal for communication differs by 90°±5° (e.g., when the power control devices for communication are the first control device on the track side and the second control device on the local side), the signal triggered by the power control device is zero. The target AC signal output by the first control device of the track-side control group is 220V AC, while the target AC signal output by the second control device of the local-side control group is 110V AC.

[0091] Reference Figure 2The first bundle includes a track-side control group and a local-side control group. Each track-side control group includes two first control devices, and each local-side control group includes two second control devices. The composition and connection method of the second bundle are the same as the first bundle. The first control devices in different track-side control groups (e.g., ...) are connected... Figure 2 The first control device 1 and the first control device 2 communicate signal data via a first communication data bus, and the second control devices in different local side control groups communicate signal data via a second communication data bus. Each first and second control device can communicate using the Controller Area Network (CAN) bus protocol. The first control devices in the same track-side control group or the same local side control group are connected to the same output bus via the live wire L and the neutral wire N, through which the target AC signal can be sent to the aforementioned downstream load 500.

[0092] All first control devices in all track-side control groups are connected to the same first phase-alignment bus A, and communicate phase-alignment zero-crossing signals through the first phase-alignment bus A. All second control devices in all local-side control groups are connected to the same second phase-alignment bus B, and communicate phase-alignment zero-crossing signals through the second phase-alignment bus B. The first control devices on the track side and the second control devices on the local side communicate phase-difference zero-crossing signals through a phase-difference bus C. This phase-difference bus C ensures that the zero-crossing signal communication between the second control devices on the local side and the first control devices on the track side meets a phase difference of 90° ± 5°. Here, ZCHO is the phase-alignment zero-crossing signal output terminal, ZCHI is the phase-alignment zero-crossing signal input terminal, ZCSO is the phase-difference zero-crossing signal output terminal, and ZCSI is the phase-difference zero-crossing signal output terminal. It can be understood that... Figure 1 The zero-crossing signal bus in the middle is Figure 2 The first phase-consistent bus, the second phase-consistent bus, or the phase difference bus in the system.

[0093] It is evident that the contents of the above power control device embodiments are all applicable to the embodiments of this phase-sensitive track system. The specific functions implemented by this phase-sensitive track system embodiment are the same as those of the above power control device embodiments, and the beneficial effects achieved are also the same as those achieved by the above power control device embodiments.

[0094] like Figure 3As 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-current control element Q0, and a second capacitor C2. The input terminal of the first rectifier unit 210 is electrically connected to the AC signal source 100. 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 with the output terminal of the first rectifier unit 210 and is electrically connected to the second input terminal of the multiplier M1. The first inductor L1 is electrically connected to the input terminals of the first rectifier unit 210, the isolation module 300, and the first current loop IC1, respectively. The control terminal of the voltage-controlled current element Q0 is electrically connected to the output terminal of the first current loop IC1, and the switching terminal of the voltage-controlled current 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 switching terminal of the voltage-current control element Q0. The second capacitor C2 is also electrically connected to the input terminal 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 initial 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-current control element Q0 is used to perform a power correction operation on the initial DC signal to obtain the initial DC signal.

[0095] Specifically, refer to Figure 3 The first rectifier unit 210 is a rectifier circuit composed of four diodes. Specifically, 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 of the first diode D1 and the second diode D2 is the first input terminal of the first rectifier unit 210, the connection node of the third diode D3 and the fourth diode D4 is the second input terminal of the first rectifier unit 210, the connection node of the first diode D1 and the third diode D3 is the first output terminal of the first rectifier unit 210, and the connection node of the second diode D2 and the fourth diode D4 is the second output terminal of the first rectifier unit 210.

[0096] 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-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.

[0097] The two ends of the first capacitor C1 are connected in parallel with the two output terminals of the first rectifier unit 210. The first inductor L1 is electrically connected to the isolation module 300 and the first output terminal of the first rectifier unit 210, respectively. The first switching terminal of the voltage-controlled current element Q0 is electrically connected to the connection node of the first inductor L1 and the isolation module 300, and the second switching terminal of the voltage-controlled current element Q0 is electrically connected to the second output terminal of the first rectifier unit 210. The two ends of the second capacitor C2 are connected in parallel with the two switching terminals of the voltage-controlled current element Q0.

[0098] Both the first voltage loop VC1 and the first current loop IC1 are controlled by 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 the voltage reference value Vref_pfc, which is preset according to requirements. Before being input to the first voltage loop VC1, the target converted output voltage and the preset first reference voltage-current data are subtracted, so that the first voltage loop VC1 performs proportional-integral control based on the result of the subtraction operation, and outputs a correction difference voltage to the first input terminal of the multiplier M1.

[0099] Multiplier M1 performs signal multiplication based on the correction difference voltage received at its first input terminal and the initial conversion output voltage received at its second input terminal to obtain the first reference current Iref_pfc. Before being input to the first current loop IC1, the first reference current and the current Il_pfc of the first inductor L1 are subtracted, causing the first current loop IC1 to perform proportional-integral control based on the result of the subtraction operation, thereby outputting a first pulse control signal PWM1 to the control terminal of the voltage-controlled current element Q0. The duty cycle of the first pulse control signal PWM1 changes according to the result of the 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 initial DC signal to obtain the initial DC signal. The voltage of the initial DC signal finally output from the conversion module 200 can be 400V.

[0100] By implementing dual closed-loop control of the voltage loop and current loop as described above, the output dynamic performance of the converter module 200 can be improved.

[0101] like Figure 4As 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 switching unit 310, a transformer unit, and a second rectifier unit 330. The first switching unit 310 is connected in parallel with the voltage-current control element Q0, and the first switching unit 310 is electrically connected to the output terminal of the second voltage loop VC2; the transformer unit is electrically connected to the first switching unit 310; the second rectifier unit 330 is electrically connected to the input terminals of the transformer unit and the second voltage loop VC2 respectively, and the voltage at the output terminal of the second rectifier unit 330 is an 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 switching 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 is used to generate a resonant output signal based on the square wave signal, and the second rectifier unit 330 is used to generate a target DC signal based on the resonant output signal.

[0102] Specifically, refer to Figure 4 The isolation module 300 consists of a three-phase LLC resonant circuit. The first switching unit 310 consists of six switching transistors, three inductors, and three capacitors, wherein two switching transistors, one inductor, and one capacitor can form a one-phase resonant switching subunit (e.g., Figure 4 The first switching subunit 311, the second switching subunit 312, and the third switching subunit 313 are included, and the switching transistors mentioned above can all be field-effect transistors. The transformer unit includes three transformers: the first transformer T1 is electrically connected to the first switching subunit 311, the second transformer T2 is electrically connected to the second switching subunit 312, and the third transformer T3 is electrically connected to the third switching subunit 313. The second rectifier unit 330 includes six diodes, where a pair of diodes forms a rectifier subunit by electrically connecting the anode of one diode to the cathode of another (e.g., ...). Figure 4 The isolation module 300 includes a first rectifier subunit 331, a second rectifier subunit 332, and a third rectifier subunit 333. An input capacitor Cin can be set at the input terminal of the isolation module 300, and an output capacitor Cout can be set at the output terminal of the isolation module 300. The voltage across the output capacitor Cout is the isolation output voltage.

[0103] The second voltage loop VC2 is controlled by a proportional-integral (PI) controller. The second reference voltage-current data is specifically the voltage reference value Vref_llc, which is preset according to requirements. Before being input to the second voltage loop VC2, the isolated output voltage and the preset second reference voltage-current data are subtracted. This allows the second voltage loop VC2 to perform proportional-integral control based on the result of the subtraction operation, outputting a second pulse control signal PWM2 to the control terminals of each switch in the first switching unit 310. The phase difference between each pair of the second pulse control signals PWM2 received by the first switching subunit 311, the second switching subunit 312, and the third switching subunit 313 is 120°, and the duty cycle is 50%. The frequency of the signals varies according to the result of the subtraction operation received by the second voltage loop VC2.

[0104] The first switching unit 310 converts the initial DC signal into a three-phase square wave signal according to the second pulse control signal PWM2. The transformer in the transformer unit resonates on the primary side according to the square wave signal, thereby outputting a three-phase resonant output signal to the second rectifier unit 330 on the secondary side. Finally, the second rectifier unit 330 rectifies the three-phase resonant output signal to obtain the target DC signal.

[0105] As can be seen, the isolation module 300 of this embodiment adopts the above-mentioned three-phase LLC resonant circuit topology, which can reduce the size and weight of the equipment while achieving isolation. It can meet industry standards in all aspects and achieve isolation while minimizing the weight and size of the equipment.

[0106] like Figure 5As 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 switching 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 of the downstream load 500 and the output terminal of the inverter module 400, an external control device, and the input terminal of the third voltage loop VC3. The output terminal of the third voltage loop VC3 is electrically connected to the input terminal of the second current loop IC2. The output terminal of the second current loop IC2 is electrically connected to the first input terminal of the divider M2. The external control device is also used to provide external current limiting control data. The third capacitor C3 is connected in parallel with the output terminal of the second rectifier unit 330, and is electrically connected to the second input terminal of the divider M2. The voltage across the third capacitor C3 is the inverter input voltage. The second switching unit 410 is electrically connected to the output terminals of the third capacitor C3 and the divider M2, respectively. One end of the second inductor L2 is electrically connected to the first output terminal of the second switching unit 410, and is also electrically connected to the input terminal 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 terminal of the second switching unit 410. The fourth capacitor C4 is also connected to the third voltage loop V. The input terminal of C3 is electrically connected, the voltage across the fourth capacitor C4 is the inverter output voltage, and the output current of the fourth capacitor C4 is the inverter output current. The loop control unit 610 generates the loop control voltage based on the zero-crossing signal, external current limiting control data, third reference voltage-current data, and inverter output current. The third voltage loop VC3 generates the second reference current based on the loop control voltage, inverter output current, and inverter output voltage. The second current loop IC2 generates the inverter differential voltage based on the second reference current and the current of the second inductor L2. The divider M2 generates the third pulse control signal based on the inverter differential voltage, inverter output voltage, and inverter input voltage. The second switching unit 410 converts the target DC signal into a target AC signal based on the third pulse control signal.

[0107] Specifically, refer to Figure 5The second switching 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 switching 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 switching 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 switching 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 switching unit 410. The third capacitor C3 is connected in parallel with the two input terminals of the second switching unit 410. The second inductor L2 is electrically connected to the first output terminal of the second switching unit 410. The third inductor L3 is electrically connected to the second inductor L2 and the subsequent load 500. The subsequent load 500 is also electrically connected to the second output terminal of the second switching 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 switching unit 410.

[0108] The third voltage loop VC3 employs a quasi-proportional resonant controller (G) with an N-fold fundamental frequency. PRN Control can be achieved using a quasi-proportional resonant controller with frequencies of 1, 3, 5, or 7 times the fundamental frequency (such as...). Figure 5 G in PR1 G PR3 G PR5 G PR7 The second current loop IC2 is controlled by a proportional controller (P).

[0109] The loop control unit 610 communicates with external control equipment in the phase-sensitive track system via a communication data bus and a zero-crossing signal bus. The loop control unit 610 obtains the zero-crossing signal and external current-limiting control data from the external control equipment, and obtains the inverter output current Io_inv from the fourth capacitor C4. Based on the zero-crossing signal, external current-limiting control data, inverter output current Io_inv, and preset third reference voltage-current data, the loop control unit 610 generates and sends the loop control voltage Vdroop / Vpll to the third voltage loop VC3. Specifically, the third reference voltage-current data is a pre-set voltage reference value Vrms_ref.

[0110] Before being input to the third voltage loop VC3, the inverter output current Io_inv is transformed using the virtual impedance transfer function Gvirtual. The transformation result is then subtracted from the loop control voltage Vdroop / Vpll. This allows the third voltage loop VC3 to perform quasi-proportional resonant control based on the received signal subtraction result, outputting the second reference current Iref_inv to the input of the second current loop IC2. The quasi-proportional resonant control can employ 1st, 3rd, 5th, or 7th harmonic frequencies to effectively suppress harmonics, ensuring that the output of the third voltage loop VC3 meets harmonic content requirements under different operating conditions. After completing the quasi-proportional resonant control at the four fundamental frequencies, the outputs of the four quasi-proportional resonant controllers are summed using a summer to obtain the aforementioned second reference current Iref_inv.

[0111] Before being input to the second current loop IC2, the current Il_inv of the second inductor L2 is subtracted from the second reference current Iref_inv. This allows the second current loop IC2 to perform proportional control based on the received subtraction result, outputting an inverter differential voltage. The inverter differential voltage is then added to the inverter output voltage Vc_inv, and the addition result is sent to the input of the divider M2. The divider M2 receives the addition result and the inverter input voltage Vi_inv across the third capacitor C3 from its input. It divides the addition result by the inverter input voltage Vi_inv to generate and send a third pulse control signal PWM3 to the four switches of the second switching unit 410. Upon receiving the third pulse control signal PWM3, the four switches alternately turn on and off according to PWM3, thereby achieving the inversion of the target DC signal to obtain the target AC signal.

[0112] like Figure 5As shown, in some specific embodiments of the present invention, the external current limiting control data includes the external current limiting compensation voltage and the effective value of the external current; the loop control voltage includes the droop reference voltage and the phase-locked loop 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 control device, respectively, and is used to generate a target current limiting compensation voltage based on the inverter output current and the external current limiting compensation voltage. The current sharing loop is also electrically connected to the fourth capacitor C4 and the external control device, and is used to generate a target current sharing compensation voltage based on the inverter output current and the effective value of the external current. 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. The adder M3 is used to generate a target current sharing compensation voltage based on the target current limiting compensation voltage, the target current sharing compensation voltage, and the third reference voltage-current data. The reference voltage RMS value; the droop loop is electrically connected to the input terminals of the fourth capacitor C4, the third voltage loop VC3, the output terminal of the adder M3, and the external control equipment, respectively. The droop loop is used to generate the droop reference voltage based on the zero-crossing signal, the target reference voltage RMS 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 input terminals of the fourth capacitor C4, the third voltage loop VC3, the output terminal of the adder M3, and the external control equipment, respectively. The phase-locked loop is used to generate the phase-locked reference voltage based on the zero-crossing signal, the inverter output voltage, and the frequency of the target AC signal.

[0113] Specifically, the current limiting loop obtains the external current limiting compensation voltage Volimit provided by the external control device through the communication data bus. Simultaneously, the inverter output current Io_inv is calculated 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 sends this target current limiting compensation voltage Vlimit to adder M3 and other power control devices in the phase-sensitive track system.

[0114] The current sharing loop obtains the external current effective value Iorms provided by the external control device through the communication data bus. The current sharing loop generates a target current sharing compensation voltage Vsharing based on the local current effective value Irms and the external current effective value Iorms, and sends the target current sharing compensation voltage Vsharing to adder M3.

[0115] 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 effective value of the target reference voltage Vrms_ref1. The droop loop performs droop reference calculation based on the received zero-crossing signal, the effective value of the target reference voltage Vrms_ref1, the inverter output voltage Vc_inv, the inverter output current Io_inv, and the frequency W of the target AC signal to obtain the droop reference voltage Vdroop. The phase-locked loop performs phase-locked reference calculation based on the received zero-crossing signal, the inverter output voltage Vc_inv, and the frequency W of the target AC signal to obtain the phase-locked reference voltage Vpll.

[0116] The parallel connection of multiple AC voltage regulators is based on the droop loop and phase-locked loop described in the above embodiment. The droop loop's function is to achieve power sharing, thereby achieving current sharing. The phase-locked loop's function is to obtain the amplitude and phase information of the output bus voltage when a device starts up first, and to use the information obtained from phase-locking as the voltage reference for the voltage and current dual closed loop. This is only used when the AC voltage regulator is starting up. After successful phase-locking, the AC voltage regulator will close the controllable switch S, and subsequent operation will be controlled by the droop loop.

[0117] The aforementioned phase-sensitive orbital system embodiment mentions that different beams need to meet the phase consistency condition. Since the output buses of different beams are not connected together, a drooping loop cannot be used to ensure phase consistency. Therefore, referring to... Figure 2 By sending the zero-crossing signals of the first control device on the track side or the second control device on the local side to the zero-crossing signal bus on the same side (such as the first phase-consistent bus on the track side or the second phase-consistent bus on the local side), after the droop loop and the phase-locked loop detect the zero-crossing signal through the zero-crossing signal bus, the droop loop will clear the phase angle of the droop reference voltage Vdroop to zero, and the phase-locked loop will clear the phase angle of the phase-locked reference voltage Vpll to zero. In this way, the phase of the output bus voltage of different bundles can be guaranteed to be consistent in at most one cycle.

[0118] like Figure 6As shown, in some specific embodiments of the present invention, the drooping loop includes: a first integrator SOGI1, a second integrator SOGI2, a power calculation subunit 621, a frequency drooping subunit 622, an amplitude drooping subunit 623, and a drooping synthesis subunit 624. The first integrator SOGI1 is electrically connected to the fourth capacitor C4. The first integrator SOGI1 is used to generate a first phase difference voltage pair based on the inverter output voltage. The second integrator SOGI2 is electrically connected to the fourth capacitor C4. The second integrator SOGI2 is used to generate a phase difference current pair based on the inverter output current. The power calculation subunit 621 is electrically connected to the first integrator SOGI1 and the second integrator SOGI2 respectively. The power calculation subunit 621 is used 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. The frequency droop subunit 622 is used to calculate the first phase angle reference data based on the zero-crossing signal, active power, and the frequency of the target AC signal. The amplitude droop subunit 623 is used to calculate the first amplitude reference data based on 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 based on the first phase angle reference data and the first amplitude reference data.

[0119] Specifically, after receiving the inverter output voltage Vc_inv, the first integrator SOGI1 integrates the inverter output voltage Vc_inv to obtain the first phase difference voltage pair Vα1 and Vβ1 along the αβ axis, which are 90° out of phase. After receiving the inverter output current Io_inv, the second integrator SOGI2 integrates the inverter output current Io_inv to obtain the phase difference current pair Iα and Iβ along the αβ axis, which are 90° out of phase.

[0120] The power calculation subunit 621 receives the first phase difference voltage pair Vα1 and Vβ1 and the phase difference current pair Iα and Iβ, and uses them to calculate active power and reactive power. The formula for calculating active power is Vα1*Iα + Vβ1*Iβ, and the formula for calculating reactive power is Vα1*Iα - Vβ1*Iβ. After completing the power calculation, the results are processed by a low-pass filter (LPF) to obtain the active power Q and reactive power P.

[0121] The frequency droop subunit 622 receives the active power Q and the frequency W of the target AC signal, and calculates the frequency droop using the formula Wn*Q (where n is the frequency droop coefficient). This calculated frequency droop result is then processed by integrator I to obtain the first phase angle reference data theta1. Simultaneously, if the frequency droop subunit 622 receives a zero-crossing signal via the zero-crossing signal bus, it clears the first phase angle reference data theta1 to zero. If the frequency droop subunit 622 does not detect a zero-crossing signal, it restores the first phase angle reference data theta1 using the aforementioned calculation method.

[0122] The droop subunit 623 receives the reactive power P and the effective value of the target reference voltage Vrms_ref1, and then uses the droop formula... (m is the amplitude droop coefficient) Calculate the first amplitude reference data Va_droop.

[0123] 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 the droop reference voltage Vdroop. The synthesis formula is Vdroop = Va_droop * sin(theta1).

[0124] like Figure 7 As shown, in some specific embodiments of the present invention, the phase-locked loop includes: a third integrator, a coordinate system transformation subunit 631, a low-pass filter subunit 632, a phase-locked judgment subunit 633, and a phase-locked synthesis subunit 634. The third integrator is electrically connected to the fourth capacitor C4. The third integrator is used to generate a second phase difference voltage pair based on the inverter output voltage. The coordinate system transformation subunit 631 is electrically connected to the third integrator. The coordinate system transformation 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 filter subunit 632 is electrically connected to the coordinate system transformation subunit 631. The low-pass filter subunit 632 is used to perform a low-pass filter 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 transformation subunit 631. 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 zero-crossing signal and 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 filter subunit 632 and the phase-locked judgment subunit 633 respectively. 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.

[0125] Specifically, after receiving the inverter output voltage Vc_inv, the third integrator integrates it to obtain a second phase difference voltage pair Vα2 and Vβ2 along the αβ axis, which are 90° out of phase. The coordinate system transformation subunit 631 receives the second phase difference voltage pair Vα2 and Vβ2, thereby converting the second phase difference voltage pair Vα2 and Vβ2 along the αβ axis of the two-phase stationary coordinate system into the dq axis 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.

[0126] The low-pass filter 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-locked loop (PLL) determination subunit 633 first tracks and determines the value of the second rotating coordinate axis voltage Vq using a proportional-integral (PI) controller. When Vq is determined to be zero, it indicates successful phase locking. Simultaneously, the result output by the PI controller is added to the frequency W of the target AC signal. The result of this addition is then integrated by the integrator I controller to obtain the second phase angle reference data theta2. If the PLL determination subunit 633 receives a zero-crossing signal via the zero-crossing signal bus, it clears the second phase angle reference data theta2. If the PLL determination subunit 633 does not detect a zero-crossing signal, it restores the second phase angle reference data theta2 using the aforementioned calculation method.

[0127] Phase-locked loop (PLL) synthesis subunit 634 receives the second phase angle reference data theta2 and the second amplitude reference data Va_pll, and synthesizes them to obtain the PLL reference voltage Vpll. The synthesis formula is Vpll = Va_pll * sin(theta2).

[0128] like Figure 8 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 initial current limiting compensation voltage based on the external current limiting compensation voltage to obtain the target current limiting compensation voltage.

[0129] Specifically, the third current loop IC3 is controlled by an integral controller (I). Before the input is sent to the third current loop IC3, the preset reference current limit value Ilimit is subtracted from the local current effective value Irms. This allows the third current loop IC3 to perform integral control based on the result of the subtraction operation, thereby obtaining the initial current limit compensation voltage.

[0130] The current limiting voltage processing subunit 641 limits the initial current limiting compensation voltage to a minimum value that is negative and a maximum value that is zero. This ensures that the local current effective value Irms will not affect the compensation voltage when it is less than the reference current limiting value Ilimit. After the local current effective value Irms is greater than the reference current limiting value Ilimit, the compensation voltage can begin to decrease smoothly.

[0131] After limiting the initial current-limiting compensation voltage, the external current-limiting compensation voltage Volimit provided by other power control devices in the phase-sensitive track system is obtained. The current initial current-limiting compensation voltage is compared with the external current-limiting compensation voltage Volimit, and the minimum value is taken as the target current-limiting compensation voltage Vlimit. By determining the minimum compensation voltage, the problem of inrush current caused by excessive differences in the effective voltage values ​​of the various power control devices in the phase-sensitive track system after compensation can be avoided.

[0132] like Figure 9 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 initial current sharing compensation voltage to obtain the target current sharing compensation voltage.

[0133] Specifically, before the input is sent to subtractor M4, the average value of the external current Iorms provided by the external control device and the local current Irms are calculated to obtain the average calculation result Iavr. Subtractor M4 performs a signal subtraction operation between the average calculation result Iavr and the local current Irms to obtain the initial current sharing compensation voltage.

[0134] After receiving the initial current sharing compensation voltage, the current sharing voltage processing subunit 651 applies an error limit to the initial current sharing compensation voltage, clearing any initial current sharing compensation voltage lower than the preset current sharing rate to zero, thereby avoiding continuous adjustment oscillations. Subsequently, the error-limited result is processed by a proportional-integral controller, and the output result of this proportional-integral processing is then limited to ensure the steady-state accuracy requirements, thus obtaining the target current sharing compensation voltage Vsharing.

[0135] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A power control device, characterized in that, Applied to a phase-sensitive track system, the phase-sensitive track system includes an external control device, the phase-sensitive track system is electrically connected to an AC signal source, and the external control device is used to provide a zero-crossing signal; The power control device includes: A conversion module is electrically connected to the AC signal source; wherein the AC signal source is used to provide an initial AC signal, and the output voltage of the conversion module is the converted output voltage; An isolation module is electrically connected to the conversion module; wherein the output voltage of the isolation module is an isolation output voltage. An inverter module is electrically connected to the isolation module and the downstream load, respectively; wherein, the input voltage of the inverter module is the inverter input voltage, the output voltage of the inverter module is the inverter output voltage, and the output current of the inverter module is the inverter output current; The main control module is electrically connected to the conversion module, the isolation module, the inverter module, and the external control device. The main control module generates a conversion control signal based on the conversion output voltage and preset first reference voltage-current data; it also generates an isolation control signal based on the isolation output voltage and preset second reference voltage-current data; and it generates an inverter control signal based on the inverter input voltage, the inverter output voltage, the inverter output current, the zero-crossing signal, and preset third reference voltage-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 isolate the initial DC signal according to the isolation control signal to obtain a target DC signal; and the inverter module is used to convert the target DC signal into a target AC signal according to the inverter control signal. 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 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 loop control unit is electrically connected to the connection node of the downstream load and the output terminal of the inverter module, an external control device, and the input terminal of the third voltage loop. The output terminal of the third voltage loop is electrically connected to the input terminal of the second current loop, and the output terminal of the second current loop is electrically connected to the first input terminal of the divider. The external control device is also used to provide external current limiting control data. The conversion module includes: a first rectifier unit, the input terminal of which 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, which is connected in parallel with the output terminal of the first rectifier unit and electrically connected to the second input terminal of the multiplier; a first inductor, which is electrically connected to the input terminals of the first rectifier unit, the isolation module, and the first current loop; and a voltage-controlled current element, the control terminal of which is electrically connected to the output terminal of the first current loop, and the switching terminal of which is electrically connected to the connection node of the first inductor and the first rectifier unit, and the first capacitor. A second capacitor is connected in parallel with the switching terminal of the voltage-current control element. The second capacitor is also electrically connected to the input terminal of the first voltage loop. The voltage across the second capacitor is the converted output voltage. 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 initial 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. The voltage-current control element is used to perform a power correction operation on the initial DC signal based on the first pulse control signal to obtain the initial DC signal. The isolation module includes: a first switching unit connected in parallel with the voltage-current control element and electrically connected to the output terminal of the second voltage loop; a transformer unit electrically connected to the first switching unit; and a second rectifier unit electrically connected to the input terminals of the transformer unit and the second voltage loop, respectively, with the voltage at the output terminal of the second rectifier unit being the isolation output voltage; the second voltage loop is used to generate a second pulse control signal based on the second reference voltage-current data and the isolation output voltage; the first switching unit is used to convert the initial DC signal into a square wave signal based on the second pulse control signal; the transformer unit is used to generate a resonant output signal based on the square wave signal; and the second rectifier unit is used to generate the target DC signal based on the resonant output signal. The inverter module includes: a third capacitor, which is connected in parallel with the output terminal of the second rectifier unit and electrically connected to the second input terminal of the divider, the voltage across the third capacitor being the inverter input voltage; a second switching unit, which is electrically connected to the third capacitor and the output terminal of the divider; a second inductor, one end of which is electrically connected to the first output terminal of the second switching unit and also electrically connected to the input terminal of the second current loop; a third inductor, the other end of which is electrically connected to the second inductor and the subsequent load; and a fourth capacitor, one end of which is electrically connected to the connection node of the second inductor and the third inductor, the other end of which is electrically connected to the second output terminal of the second switching unit and also electrically connected to the... The input terminal of the third voltage loop is electrically connected, the voltage across the fourth capacitor is the inverter output voltage, and the output current of the fourth capacitor is the inverter output current. The loop control unit is used to generate a loop control voltage based on the zero-crossing signal, 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 differential 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 differential voltage, the inverter output voltage, and the inverter input voltage. The second switching unit is used to convert the target DC signal into the target AC signal based on the third pulse control signal.

2. The power control device according to claim 1, characterized in that, The external current limiting control data includes external current limiting compensation voltage and external current RMS value; the loop control voltage includes droop reference voltage and phase-locked loop reference voltage; the loop control unit includes: A current limiting loop is electrically connected to the fourth capacitor and the external control device, respectively. The current limiting loop is used to generate a target current limiting compensation voltage based on the inverter output current and the external current limiting compensation voltage. A current sharing loop is electrically connected to the fourth capacitor and the external control device, respectively. The current sharing loop is used to generate a target current sharing compensation voltage based on the inverter output current and the effective value of the external current. An adder, wherein the first input terminal of the adder is electrically connected to the current limiting loop, and the second input terminal of the adder is electrically connected to the current sharing loop, and the adder is used to generate a target reference voltage effective value based on the target current limiting compensation voltage, the target current sharing compensation voltage, and the third reference voltage-current data; A drooping loop is electrically connected to the fourth capacitor, the input terminal of the third voltage loop, the output terminal of the adder, and the external control device. The drooping loop is used to generate the drooping reference voltage based on the zero-crossing signal, the effective value of the target reference voltage, the inverter output voltage, the inverter output current, and the frequency of the target AC signal. A phase-locked loop (PLL) is electrically connected to the fourth capacitor, the input terminal of the third voltage loop, the output terminal of the adder, and the external control device. The PLL is used to generate the PLL reference voltage based on the zero-crossing signal, the inverter output voltage, and the frequency of the target AC signal.

3. The power control device according to claim 2, characterized in that, The drooping loop includes: A first integrator is electrically connected to the fourth capacitor and is used to generate a first phase difference voltage pair based on the inverter output voltage. The second integrator is electrically connected to the fourth capacitor and is used to generate a phase difference current pair based on the inverter output current. A power calculation subunit is electrically connected to the first integrator and the second integrator, respectively. The power calculation subunit is used 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 is used to calculate first phase angle reference data based on the zero-crossing signal, the active power, and the frequency of the target AC signal. An amplitude droop subunit is used to calculate first amplitude reference data based on the reactive power and the effective value of the target reference voltage. A drooping synthesis subunit is used to generate the drooping reference voltage based on the first phase angle reference data and the first amplitude reference data.

4. The power control device according to claim 2, characterized in that, The phase-locked loop includes: A third integrator, which is electrically connected to the fourth capacitor, is used to generate a second phase difference voltage pair based on the inverter output voltage; A coordinate system transformation subunit is electrically connected to the third integrator. The coordinate system transformation subunit is used to generate a first rotating coordinate axis voltage and a second rotating coordinate axis voltage based on the second phase difference voltage. A low-pass filter subunit is electrically connected to the coordinate system transformation subunit. The low-pass filter subunit is used to perform a low-pass filter operation on the voltage of the first rotating coordinate axis to generate second amplitude reference data. A phase-locked judgment subunit is electrically connected to the coordinate system transformation subunit. The phase-locked judgment subunit is used to perform a phase-locked judgment operation on the voltage of the second rotating coordinate axis based on the frequency of the zero-crossing signal and the target AC signal to obtain the second phase angle reference data. A phase-locked synthesis subunit is provided, which is electrically connected to the low-pass filter subunit and the phase-locked judgment subunit, respectively. The phase-locked synthesis subunit is used to generate the phase-locked reference voltage based on the second amplitude reference data and the second phase angle reference data.

5. The power control device according to claim 2, characterized in that, The current-limiting loop includes: The third current loop is electrically connected to the fourth capacitor. The third current loop 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. A current-limiting voltage processing subunit is used to adjust the initial current-limiting compensation voltage according to the external current-limiting compensation voltage to obtain the target current-limiting compensation voltage.

6. The power control device according to claim 2, characterized in that, The current sharing loop includes: A subtractor, which is electrically connected to the fourth capacitor, 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. A current-sharing voltage processing subunit is electrically connected to the subtractor. The current-sharing voltage processing subunit is used to limit the initial current-sharing compensation voltage to obtain the target current-sharing compensation voltage.

7. A phase-sensitive orbital system, characterized in that, include: A track-side control group, comprising at least two first control devices; wherein, the first control device is a power control device as described in any one of claims 1 to 6, the first control device is electrically connected to an AC signal source, the first control device is electrically connected to a downstream load via a first output bus, the phase-consistent communication ports of any two first control devices communicate with phase-consistent zero-crossing signals via a first phase-consistent bus, and the data ports of any two first control devices communicate with data via a first communication data bus; A local side control group, comprising at least two second control devices; wherein the second control devices are power control devices as described in any one of claims 1 to 6, the second control devices are electrically connected to an AC signal source, the second control devices are electrically connected to the downstream load via a second output bus, the phase-consistent communication ports of any two second control devices communicate phase-consistent zero-crossing signals via a second phase-consistent bus, and the data ports of any two second control devices communicate data via a second communication data bus; The phase difference communication port of the second control device communicates with the phase difference communication port of the first control device via a phase difference bus to exchange phase difference zero-crossing signals.

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