A high voltage power supply device

Abstract

The utility model relates to a kind of high-voltage power supply equipment, including switch group, filter module, control module, power module and isolation module, the switch group is connected with 380V input power supply, control module, power module and isolation module respectively;The input end of the filter module is connected with switch group, and the output of the filter module is connected with power module and control module respectively;The control module is connected with switch group and power module respectively;The input end of the power module is connected with filter module and control module, and the output of the power module is connected with isolation module through switch group;The output of the isolation module is connected with load through switch group.The utility model effectively reduces the peak interference and harmonic of power supply, improves system reliability.

Description

Technical Field

[0001] This utility model belongs to the field of high voltage power supply technology, and specifically relates to a high voltage power supply device. Background Technology

[0002] In railway platform power supply systems, due to frequent train starts and stops and changes in traction load, the power grid faces typical power quality problems such as harmonic pollution and voltage dips. Traditional power supply schemes have the following technical problems: (1) The 3rd / 5th / 7th characteristic harmonics generated by the train inverter are injected into the power grid through the common coupling point, resulting in THDv exceeding the limit; (2) The start and stop of high-power equipment causes instantaneous voltage drops, affecting the operation of precision instruments. Utility Model Content

[0003] To address the reliability issues of power supply systems at railway stations, this invention provides a high-voltage power supply device in its first aspect. The device includes a switch assembly, a filter module, a control module, a power supply module, and an isolation module. The switch assembly is connected to a 380V input power supply, the control module, the power supply module, and the isolation module. The input terminal of the filter module is connected to the switch assembly, and its output terminal is connected to both the power supply module and the control module. The control module is connected to both the switch assembly and the power supply module. The input terminal of the power supply module is connected to both the filter module and the control module, and its output terminal is connected to the isolation module via the switch assembly. The output terminal of the isolation module is connected to the load via the switch assembly.

[0004] In some embodiments of this utility model, the switch group includes: an input switch connected to a 380V input power supply and a control module respectively; a bypass switch connected to a 380V input power supply and a static switch respectively; a static switch connected to the bypass switch, the power module, the control module, and the isolation module respectively; an output switch connected to the isolation module and the load respectively; and a maintenance switch connected to the 380V input power supply and the load respectively.

[0005] In some embodiments of this utility model, the control module includes a sampling circuit, a control circuit, and a display screen, and both the sampling circuit and the control circuit are connected to the power supply module.

[0006] In some embodiments of this utility model, the power module includes multiple integrated DC-AC converters.

[0007] Furthermore, the multiple AC-DC integrated converters are connected to each other via CAN cables.

[0008] Furthermore, the power module includes 11 integrated DC-AC converters.

[0009] Preferably, each AC-DC integrated converter includes an AC-DC converter and a DC-AC converter connected in sequence.

[0010] More preferably, each AC-DC integrated converter includes an AC-DC converter and a DC-AC converter connected in sequence.

[0011] More preferably, the DC-AC converter includes a T-type three-level topology inverter circuit.

[0012] The beneficial effects of this utility model are:

[0013] This invention addresses the unique environment of railway platforms, where train entry and exit can easily generate harmonic interference and voltage drops. EMI filtering and RC absorption devices are installed on the input side to effectively reduce power supply spikes and harmonics, minimizing environmental interference. Since it supplies power to numerous devices in the area, load imbalance is common. Therefore, a 660KVA isolation transformer is added at the output end, employing a delta-* three-phase four-wire output. To ensure stable load operation, a fast-switching static switch is added, allowing for rapid switching to bypass operation in case of equipment failure, thus improving system reliability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the basic structure of the high-voltage power supply equipment in some embodiments of this utility model;

[0015] Figure 2 This is a schematic diagram of the specific structure of the high-voltage power supply equipment in some embodiments of this utility model;

[0016] Figure 3 This is a schematic diagram of the AC / DC rectifier circuit in some embodiments of the present invention;

[0017] Figure 4 This is a schematic diagram of a DC-AC inverter circuit in some embodiments of the present invention;

[0018] Figure Labels

[0019] 1. Switch group; 2. Filtering module; 3. Control module; 4. Power supply module; 5. Isolation module. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] refer to Figure 1 and Figure 2In a first aspect, this utility model provides a high-voltage power supply device, including a switch group 1, a filter module 2, a control module 3, a power module 4, and an isolation module 5. The switch group 1 is connected to a 380V input power supply, the control module 3, the power module 4, and the isolation module 5, respectively. The input terminal of the filter module 2 is connected to the switch group 1, and the output terminal of the filter module 2 is connected to the power module 4 and the control module 3, respectively. The control module 3 is connected to the switch group 1 and the power module 4, respectively. The input terminal of the power module 4 is connected to the filter module 2 and the control module 3, and the output terminal of the power module 4 is connected to the isolation module 5 through the switch group 1. The output terminal of the isolation module 5 is connected to a load through the switch group 1.

[0022] It is understandable that isolation transformers are used to electrically isolate the inverter output from the load, ensuring load safety.

[0023] In some embodiments of this utility model, the switch group 1 includes: an input switch, which is connected to the 380V input power supply and the control module 3 respectively; a bypass switch, which is connected to the 380V input power supply and the static switch respectively; a static switch, which is connected to the bypass switch, the power module 4, the control module 3 and the isolation module 5 respectively; an output switch, which is connected to the isolation module 5 and the load respectively; and a maintenance switch, which is connected to the 380V input power supply and the load respectively.

[0024] Specifically, the input and output switches are used to supply power to the load when the power supply is working normally; the bypass switch is used to switch to bypass power supply when there is an internal fault in the regulated power supply; the static switch ensures a quick switch to bypass power supply in case of a fault; and the maintenance switch is used to shut down the power supply when it is under maintenance.

[0025] In some embodiments of this utility model, the control module 3 includes a sampling circuit, a control circuit, and a display screen, and both the sampling circuit and the control circuit are connected to the power supply module 4.

[0026] Specifically, it includes a sampling circuit, a control circuit, and a display screen. The control uses TI's TMS320F28XX series DSP+CPLD as the main control chip to collect and calculate grid electrical signal information in real time, and control the drive of rectifiers and inverters. The display part uses ARM7 series + Linux system communication.

[0027] refer to Figure 3 and Figure 4 In some embodiments of this utility model, the power module 4 includes multiple integrated DC-AC converters. These multiple integrated DC-AC converters are connected via CAN cables. The power module 4 includes 11 integrated DC-AC converters. Each integrated DC-AC converter includes an AC-DC converter and a DC-AC converter connected in sequence.

[0028] Preferably, each AC-DC integrated converter includes an AC-DC converter and a DC-AC converter connected in sequence.

[0029] Specifically, the rectifier section of the AC / DC converter adopts a Vienna-like rectifier topology, where each phase can be independently controlled and operated. Therefore, as long as one phase of the AC power supply is normal, the rectifier can work normally and provide the DC voltage required by the inverter; the capacity is only related to the number of input phases. This topology mainly uses BOOST boosting, and the PWM width of the BOOST can be modulated from 0% to 100%, thus ensuring that the DC voltage required by the inverter can still be output normally when the input AC voltage is in the range of -40% to 30%. The three-phase active rectifier controller can activate a soft-start function during startup via PWM to slowly charge the DC intermediate support capacitor, preventing the charging current from impacting the input grid.

[0030] Without loss of generality, three-phase input: powered by a three-phase AC power supply, the input voltage is e. a (t), e b (t) and e c (t). Three-phase inductors: One inductor L is connected in series at the input of each phase. a L b and L c The circuit is used for filtering and energy storage. Bidirectional switch: Each phase contains one bidirectional switch, consisting of two back-to-back MOSFETs, allowing current to flow in both directions. Clamping diodes: Each phase has two clamping diodes, D1 and D2, used to limit voltage stress on the switching transistors. DC-side capacitors: Two equalizing capacitors, C1 and C2, are used to filter output voltage ripple and stabilize the DC output. DC load: The DC side is connected to the load RL, providing a stable DC voltage output. In this invention, the three-phase inductors correspond to L1 to L9, the clamping diodes to D1 to D6 and Q1 to Q12, the DC bus capacitors to C1 to C3, and the filter capacitors to C4 and C5; the switching devices Q1-Q18 control the current flow, achieving rectification. These switching devices are typically IGBTs (Insulated Gate Bipolar Transistors) or MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors).

[0031] Its working principle: The Vienna rectifier achieves unity power factor operation by controlling the on / off state of a bidirectional switch to track the input voltage waveform. Further, the working process can be divided into the following stages: Switch on: When the bidirectional switch is on, the AC voltage source charges the inductor, increasing the input current. Switch off: When the bidirectional switch is off, the fast recovery diode on the corresponding bridge arm conducts freewheeling, decreasing the input current. Capacitor voltage equalization: By controlling the state of the bidirectional switch, the two DC-side capacitors are made to equalize their voltage, stabilizing the output voltage.

[0032] Accordingly, the DC / AC converter adopts a T-type three-level topology. The DC / AC inverter section adopts the currently mainstream T-type three-level topology. The voltage regulation accuracy of -40% to 30% is determined by the accuracy of the front-stage BOOST boost circuit. In the case of phase loss, since the front-stage BOOST rectifier circuit can still output the voltage value required by the inverter, as long as the DC bus voltage is normal on the inverter side, the inverter can output a stable three-phase AC voltage normally.

[0033] Without loss of generality, a T-type three-level topology consists of two half-bridge inverter units and a neutral point, forming a "T"-shaped circuit structure. Each half-bridge contains two switching elements (such as IGBTs or MOSFETs) and corresponding freewheeling diodes. Switching elements: Each phase circuit typically contains four switching transistors (such as IGBTs or MOSFETs) and four freewheeling diodes. The arrangement of the switching transistors resembles the letter "T," hence the name. DC-side capacitors: There are usually two capacitors on the DC side to balance the neutral point potential. These two capacitors are responsible for feeding all or an equal amount of DC voltage to the load. Output levels: By controlling the switching transistors to turn on and off, three output voltage levels can be achieved: positive level V_dc / 2, zero level, and negative level.

[0034] Its working principle is as follows: Positive level (V_dc / 2): When switch Q1 is on and Q2, Q3, and Q4 are simultaneously off, the output level relative to the DC-side zero-potential reference point is positive. Zero level: When switches Q2 and Q3 are on simultaneously and Q1 and Q4 are off simultaneously, the output level relative to the DC-side zero-potential reference point is zero. Negative level (-V_dc / 2): When switch Q4 is on and Q1, Q2, and Q3 are simultaneously off, the output level relative to the DC-side zero-potential reference point is negative. Modulation method: Typically, sinusoidal pulse width modulation (SPWM) with third harmonic injection using space vector modulation (SVM) is used to control the operating state of the switches.

[0035] In this invention, L10, L11, and L12 are energy storage inductors used to smooth current and voltage fluctuations, reduce current ripple, and improve the stability of the output voltage. C6 to C8 are DC bus capacitors used to smooth DC voltage, reduce voltage ripple, and provide instantaneous load current. RY1 and RY2 are gate resistors. Q19 to Q24 are power switching devices, typically MOSFETs or IGBTs, used to control the circuit's on / off state and achieve energy conversion. Q19, Q21, and Q23: These switches control the conduction of the upper bridge arm. Q20, Q22, and Q24: These switches control the conduction of the lower bridge arm. D27 to D30: These are freewheeling diodes used to provide a current path when the switching elements are turned off, preventing inductor current interruption and protecting the circuit.

[0036] It is understandable that multi-level output helps reduce output harmonics and improve power quality. Each switch withstands only half the voltage of the DC bus, reducing voltage stress on the switching devices. Compared to traditional two-level topologies, the T-type three-level topology has lower conduction losses and higher efficiency. Compared to other three-level topologies (such as NPC and FC), the T-type topology has a simpler structure and fewer components. Control strategies can effectively balance the neutral point potential, reducing neutral point voltage imbalance problems. After power is drawn from the contact network, it is stepped down and split, and the single-channel 380V power supply is regulated and purified by the equipment before being supplied to the downstream applications.

[0037] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-voltage power supply device, comprising a switchgear, a filter module, a control module, a power supply module, and an isolation module, characterized in that, The switch group is connected to the 380V input power supply, the control module, the power supply module, and the isolation module, respectively. The input terminal of the filtering module is connected to the switch group, and the output terminal of the filtering module is connected to the power supply module and the control module respectively. The control module is connected to the switch group and the power module respectively; The input terminal of the power supply module is connected to the filtering module and the control module, and the output terminal of the power supply module is connected to the isolation module through a switch group. The output of the isolation module is connected to the load via a switch group.

2. The high-voltage power supply equipment according to claim 1, characterized in that, The switch group includes: The input switches are connected to the 380V input power supply and the control module, respectively. The bypass switch is connected to the 380V input power supply and the static switch respectively; A static switch is connected to a bypass switch, a power module, a control module, and an isolation module, respectively. The output switches are connected to the isolation module and the load, respectively. The maintenance switch is connected to the 380V input power supply and the load, respectively.

3. The high-voltage power supply equipment according to claim 1, characterized in that, The control module includes a sampling circuit, a control circuit, and a display screen, and both the sampling circuit and the control circuit are connected to the power supply module.

4. The high-voltage power supply equipment according to claim 1, characterized in that, The power module includes multiple AC-DC integrated converters.

5. The high-voltage power supply equipment according to claim 4, characterized in that, The multiple DC-AC integrated converters are connected via CAN cables.

6. The high-voltage power supply equipment according to claim 4, characterized in that, The power module includes 11 DC-AC integrated converters.

7. The high-voltage power supply equipment according to claim 4, characterized in that, Each AC-DC integrated converter includes an AC-DC converter and a DC-AC converter connected in sequence.

8. The high-voltage power supply equipment according to claim 7, characterized in that, The AC / DC converter includes a Vienna-Like rectifier.

9. The high-voltage power supply equipment according to claim 7, characterized in that, The AC-DC converter includes a T-type three-level topology inverter circuit.

Images