High-voltage high-power shore power supply topology device

Abstract

The utility model discloses a high-voltage high-power shore power supply topology device, which comprises a wire inlet switch, a full-control rectifier filter cabinet, a cascade module inverter cabinet, an isolation transformer cabinet and a wire outlet switch, and is characterized in that the wire inlet switch is used for switching an output power supply according to requirements; the full-control rectifying and filtering cabinet is used for rectifying and filtering a power supply and outputting direct-current voltage; the cascade module inverter cabinet is used for converting the DC voltage into a three-phase adjustable AC voltage; the isolation transformer cabinet is used for electrically isolating the three-phase adjustable alternating-current voltage through an isolation transformer and outputting a three-phase alternating-current voltage; and the outgoing line switch is used for providing the three-phase AC voltage to the ship for power supply. According to the utility model, a starting cabinet is omitted, and the power module is slowly charged in a current mode by controlling the conduction time sequence of the thyristor of the full-control rectifier bridge; and although the isolation transformer is additionally arranged at the position of the cascade module, compared with the phase shift transformer, the size is sharply reduced, the cost is lower, the power density is higher, and the maintenance and replacement cost of the power module is more advantageous.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply and use, and more specifically to a high-voltage and high-power shore power supply topology device suitable for large ships docking at docks for ship equipment electricity and loading and unloading and daily life electricity; during the docking of oil tankers, oil tankers' daily life electricity and various facilities electricity; repair and testing electricity for ocean-going ships; the high-voltage and high-power shore power supply topology device in the above-mentioned power use fields is suitable for two application scenarios of the international mainstream high-voltage power use system 6Kv 50HZ and 6.6Kv 60HZ. Background Art

[0002] When repairing ships, a large number of equipment on board need 60Hz power supply to work properly. Since the power supply frequency standard of my country's power grid is 50Hz, these equipment that need 60Hz power supply cannot work properly when connected to my country's power grid before the generator on board is put into use normally. In the past, the traditional power supply method for shipbuilding and large ports was: the generator driven by a three-phase 6kV / 50Hz motor (synchronous or asynchronous) supplied power to the ship, which had the disadvantages of high noise, low efficiency, high failure rate, inconvenient maintenance, and had to be managed by a dedicated person. When the load was suddenly increased, the dynamic characteristics of the output voltage were poor, and the frequency was unstable. As a professional power supply equipment for the ship repair and shipbuilding industry, the marine static shore power supply came into being. Because it has the function of converting 50Hz to 60Hz power supply, it has a higher cost-effectiveness and can provide shore power to ships of different standards. Compared with generators, it saves more than 20% energy and eliminates the many inconveniences brought by generators, such as high noise, high operating costs, high losses, pollution, difficult maintenance, and the need for special personnel to manage. It has stronger applicability in terms of function and can monitor the operation of the power supply in real time. It is widely used by major domestic shipbuilding and ship repair companies.

[0003] At present, the conventional mainstream high-voltage shore power supply topology is composed of: incoming line switch, starting cabinet, phase shifter, power rectifier inverter, harmonic absorption, isolation transformer, outgoing line switch, control system, such as Figure 1 The power-on process is as follows: 10kV incoming line switch closing → current limiting through the resistor of the starter cabinet → phase shifting transformer secondary low-voltage side output 21 (also 21±3, hereinafter referred to as 21) 690V three-phase voltage → the internal diode rectifier bridge of the cascade module charges the cascade module (such as Figure 2 After charging is completed, the bypass switch of the starter cabinet is closed, the current limiting resistor is bypassed, the control sends an unlocking command, and the power module unlocks and outputs the required voltage.

[0004] However, the secondary side of the above-mentioned phase-shift transformer usually has 21 windings to power the cascade module. Although the output of each winding is only 690V, it needs to be designed according to the 6.6kV voltage insulation level of the cascade module, which will significantly increase the size of the transformer and the material cost will be very high. At the same time, the multi-channel output and high-voltage potential design will increase the failure rate in the harsh environment of the seaside. The failure of a single group of outputs may cause the failure of the entire transformer, and the maintenance and replacement costs are very high. At the same time, the current limiting resistor of the starting cabinet plays a role in limiting the current of the power module when the incoming line switch is closed. After the power module is charged, the switch in the starting cabinet needs to bypass the current limiting resistor, and the bypass switch only plays a role in passing large currents at this time. It is of little use and will increase the size and cost of the equipment. Summary of the invention

[0005] In view of this, in order to solve the above technical problems, the utility model provides a high-voltage and high-power shore power supply topology device, which reduces the size of the equipment and reduces the cost.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A high-voltage and high-power shore power supply topology device comprises an incoming line switch, a fully-controlled rectifier filter cabinet, a cascade module inverter cabinet, an isolation transformer cabinet and an outgoing line switch, wherein the incoming line switch, the fully-controlled rectifier filter cabinet, the cascade module inverter cabinet, the isolation transformer cabinet and the outgoing line switch are connected in sequence;

[0008] The incoming line switch is used to switch the output power supply according to requirements;

[0009] The fully controlled rectifier and filter cabinet is used to rectify and filter the power supply to output a DC voltage;

[0010] The cascade module inverter cabinet is used to convert the DC voltage into a three-phase adjustable AC voltage;

[0011] The isolation transformer cabinet is used to electrically isolate the three-phase adjustable AC voltage through the isolation transformer and output the three-phase AC voltage;

[0012] The outgoing line switch is used to provide three-phase AC voltage to the ship for power supply.

[0013] Preferably, the fully-controlled rectifier and filter cabinet includes a fifth-order single-tuned filter circuit and a six-pulse fully-controlled rectifier bridge circuit, the three-phase AC side of the six-pulse fully-controlled rectifier bridge circuit is respectively connected to the fifth-order single-tuned filter circuit and the incoming line switch, the fifth-order single-tuned filter circuit is used to absorb odd harmonics during the operation of the six-pulse fully-controlled rectifier bridge circuit, and the six-pulse fully-controlled rectifier bridge circuit is used to output DC voltage.

[0014] Preferably, the cascade module inverter cabinet includes a three-phase inverter bridge arm, the DC side of the three-phase inverter bridge arm is connected to the output DC side of the six-pulse full-controlled rectifier bridge circuit, each inverter bridge arm includes eight cascade modules, and the eight cascade modules are connected in sequence.

[0015] Preferably, each of the cascade modules comprises a high-voltage DC side unit, a transformer module and a high-voltage AC side unit, and the high-voltage DC side unit, the transformer module and the high-voltage AC side unit are connected in sequence;

[0016] The high-voltage DC side unit is used to invert the DC voltage into an AC voltage;

[0017] The transformer module is used for electrical isolation;

[0018] The high-voltage AC side unit is used to invert the AC voltage into a three-phase adjustable AC voltage.

[0019] Preferably, the high-voltage DC side unit comprises a resistor R1, a capacitor C1, a capacitor C11 and a first H-bridge circuit, and the resistor R1, the capacitor C1, the capacitor C11 and the first H-bridge circuit are connected in parallel;

[0020] The first H-bridge circuit includes two half-bridge IGBT modules connected in parallel.

[0021] Preferably, the high-voltage AC side unit includes a diode rectifier bridge, an inductor L1, a resistor R2, a capacitor C2, a capacitor C21, a capacitor C22 and a second H-bridge circuit, and the diode rectifier bridge and the inductor L1 are connected in parallel with the resistor R2, the capacitor C2, the capacitor C21, the capacitor C22 and the second H-bridge circuit respectively;

[0022] The second H-bridge circuit includes two half-bridge IGBT modules connected in parallel.

[0023] Preferably, the isolation transformer cabinet includes an LRC filter unit and an isolation transformer. The LRC filter unit is used to filter out harmonics during inversion of the cascade module and output them to the primary side of the isolation transformer. The isolation transformer outputs a three-phase AC voltage after isolation transformation.

[0024] Preferably, the six-pulse fully-controlled rectifier bridge circuit includes a three-phase bridge arm circuit, and each phase bridge arm circuit is composed of four thyristors connected in series.

[0025] It can be seen from the above technical solution that compared with the prior art, the utility model discloses a high-voltage and high-power shore power supply topology device, which eliminates the starting cabinet and slowly charges the power module in current mode by controlling the conduction timing of the fully-controlled rectifier bridge thyristor; the phase-shifting transformer is eliminated, and although an isolation transformer is added at the position of the cascade module, compared with the phase-shifting transformer, the volume is drastically reduced and the cost is lower, the power density is higher, and the maintenance and replacement cost of the power module is more advantageous. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the existing conventional mainstream high-voltage shore power supply topology.

[0028] Figure 2 This is a schematic diagram of the topological structure of the power module of the existing conventional shore power supply.

[0029] Figure 3 The utility model is a schematic diagram of a high-voltage and high-power shore power supply topology device.

[0030] Figure 4 This is a topological diagram of the cascade module of the utility model. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The utility model embodiment discloses a high-voltage and high-power shore power supply topology device, such as Figure 1 As shown, it includes: an incoming switch, a fully controlled rectifier filter cabinet, a cascade module inverter cabinet, an isolation transformer cabinet and an outgoing switch, and the incoming switch, the fully controlled rectifier filter cabinet, the cascade module inverter cabinet, the isolation transformer cabinet and the outgoing switch are connected in sequence;

[0033] The incoming line switch is used to switch the output power supply according to requirements;

[0034] The fully controlled rectifier and filter cabinet is used to rectify and filter the power supply to output DC voltage;

[0035] The cascade module inverter cabinet is used to convert the DC voltage into a three-phase adjustable AC voltage;

[0036] The isolation transformer cabinet is used to electrically isolate the three-phase adjustable AC voltage through the isolation transformer and output the three-phase AC voltage;

[0037] The outgoing line switch is used to provide three-phase AC voltage to the ship's power supply.

[0038] Specifically, the fully controlled rectifier filter cabinet includes a fifth-order single-tuned filter circuit and a six-pulse fully controlled rectifier bridge circuit. The three-phase AC side of the six-pulse fully controlled rectifier bridge circuit is respectively connected to the fifth-order single-tuned filter circuit and the incoming line switch. The fifth-order single-tuned filter circuit is used to absorb odd harmonics during the operation of the six-pulse fully controlled rectifier bridge circuit. The six-pulse fully controlled rectifier bridge circuit is used to output DC voltage. The six-pulse fully controlled rectifier bridge circuit includes a three-phase bridge arm circuit, and each phase bridge arm circuit is composed of four thyristors connected in series. The six-pulse fully controlled rectifier bridge circuit is turned on according to the control system command to achieve the purpose of controllable DC voltage and current. When the cascade module of the cascade module inverter cabinet is started, the six-pulse fully controlled rectifier bridge circuit charges the DC side of the cascade module with constant current in constant current mode, allowing the DC side of the cascade module to soft-start.

[0039] The cascade module inverter cabinet includes a three-phase inverter bridge arm, the DC side of the three-phase inverter bridge arm is connected to the output DC side of the six-pulse fully controlled rectifier bridge circuit, and each inverter bridge arm includes eight cascade modules. Figure 2As shown, each cascade module includes a high-voltage DC side unit, a transformer module and a high-voltage AC side unit, and the high-voltage DC side unit, the transformer module and the high-voltage AC side unit are connected in sequence. The high-voltage DC side unit includes a resistor R1, a capacitor C1, a capacitor C11 and a first H-bridge circuit, and the resistor R1, the capacitor C1, the capacitor C11 and the first H-bridge circuit are connected in parallel; the first H-bridge circuit includes two parallel half-bridge IGBT modules, and the half-bridge IGBT modules S12 and S13 are composed of two upper and lower IGBT units. The high-voltage DC side unit HDC- and the next module HDC+ are connected in series to achieve the purpose of series voltage division of the cascade module on the DC side. Each module relies on R1 to balance the voltage, and the IGBT of the first H-bridge circuit inverts the AC voltage according to the instruction; the transformer module is connected between the high-voltage DC unit and The high-voltage AC side units play an electrical isolation role, and the transformer primary impedance can be used as the medium for ACL1, ACN1, and inversion; the high-voltage AC side unit includes a diode rectifier bridge, an inductor L1, a resistor R2, a capacitor C2, a capacitor C21, a capacitor C22, and a second H-bridge circuit. After the diode rectifier bridge and the inductor L1 are connected, they are respectively connected in parallel with the resistor R2, the capacitor C2, the capacitor C21, the capacitor C22, and the second H-bridge circuit; the second H-bridge circuit includes two parallel half-bridge IGBT modules, and the half-bridge IGBT modules S21 and S22 are composed of two upper and lower IGBT units. The high-voltage AC side unit rectifies the ACL2 and ACN2 AC voltages output by the isolation transformer through a diode rectifier bridge, and suppresses the rectified pulsating current through the inductor L1 to ensure that the voltage of the C2 support capacitor is relatively stable. The second H-bridge circuit composed of S21 and S22 inverts the output voltage waveform required according to the energy provided by C2, and the high-voltage AC side cascades the output target voltage.

[0040] The specific process is: each cascade module HDC+, HDC- DC side is connected in series, and the inverter AC side ACL3, ACN3 is cascaded. For a single cascade module, the high-voltage DC side unit is symmetrically ...

[0041] In the embodiment, a 6kV 5MW shore power supply is taken as an example. The incoming switch adopts a 10kV switch cabinet, the switch model is KYN28-12 / 630, the switch cabinet has a rated voltage of 10kV (compatible with 6kV), a rated current of 630A, a current transformer ratio of 600 / 5 in the incoming switch, and outputs one measurement sampling current and one protection current.

[0042] The fundamental compensation capacity of the five-order single-tuned branch is 1Mvar, the installed capacity is 1.5Mvar, the resonance point is 0.99, and the 5th, 7th, 11th, and 13th harmonics output during the rectification process of the six-pulse rectifier bridge circuit are filtered out, while providing capacitive power to improve the power factor. The six-pulse thyristor rectifier bridge is composed of model KPD1000-65, with a rated voltage of 6.5kV and a rated current of 1000A. The single-phase bridge arm consists of 4 series, and the entire fully controlled rectifier bridge has a total of 12 thyristors. The anode reactance model connected after the six-pulse fully controlled rectifier bridge circuit is: DC smoothing chopper reactance L320A400uHx2-OPH, voltage 1kV, rated current 500A, inductance 3mH.

[0043] Capacitor C1 model is CBB9LNX-1200-600, rated voltage 1200V; the half-bridge IGBT module on the high-voltage DC side adopts model: 2MBI600XNG-17, rated voltage 1700V, rated current 600A, one H-bridge is composed of two half-bridge IGBT modules; the transformer module adopts model GPBG-600 / 1.2Z, rated voltage 1200V, rated current 600A; the diode rectifier bridge is a 1500V 630A conventional market model to rectify the output ACL2 and ACN2. Inductor L1 selects 1000V voltage 500A 3mH iron core inductor to suppress the pulsating current output by the diode. The S21 and S22 modules on the high-voltage AC side use the 2MBI600XNG-17 model for inversion, which is consistent with the DC side model.

[0044] The transformer cabinet is equipped with conventional LRC harmonic absorption devices. The isolation transformer adopts model SC10-5000 / 6.6, voltage level 6.6kV capacity 5000KVA, Dyn11 connection group, star type on the outgoing line switch side, and the neutral point is grounded through a resistor.

[0045] Outlet switch model: KYN 28-6.6 / 630, voltage level 6.6kV, rated current 630A, connect the ship load according to the instruction requirements.

[0046] The specific working process of this utility model is:

[0047] After the incoming switch is closed, the 10kV high voltage enters the six-pulse fully-controlled rectifier bridge circuit composed of thyristors. The five-order single-tuned filter circuit absorbs the 5th, 7th, 11th, and 13th characteristic harmonics during the rectification process of the fully-controlled rectifier bridge, and performs reactive power compensation at the same time. The six-pulse fully-controlled rectifier bridge circuit charges the DC side of the cascade module with a constant current during the startup phase of the cascade module according to the instructions of the controller. After the device is charged, it operates in constant voltage mode. The cascade module AC inverter side is cascaded, and the output voltage is 6.6kV / 6kV, 60HZ / 50HZ, which is transmitted to the upper port of the 6.6kV outgoing switch after LRC harmonic absorption and electrical isolation of the isolation transformer. The outgoing switch switches on and off the power supply according to the instructions of the controller.

[0048] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-voltage and high-power shore power supply topology device, characterized in that: It includes an incoming line switch, a fully controlled rectifier filter cabinet, a cascade module inverter cabinet, an isolation transformer cabinet and an outgoing line switch, wherein the incoming line switch, the fully controlled rectifier filter cabinet, the cascade module inverter cabinet, the isolation transformer cabinet and the outgoing line switch are connected in sequence; The incoming line switch is used to switch the output power supply according to requirements; The fully controlled rectifier and filter cabinet is used to rectify and filter the power supply to output a DC voltage; The cascade module inverter cabinet is used to convert the DC voltage into a three-phase adjustable AC voltage; The isolation transformer cabinet is used to electrically isolate the three-phase adjustable AC voltage through the isolation transformer and output the three-phase AC voltage; The outgoing line switch is used to provide three-phase AC voltage to the ship for power supply.

2. A high-voltage and high-power shore power supply topology device according to claim 1, characterized in that: The fully-controlled rectifier and filter cabinet includes a fifth-order single-tuned filter circuit and a six-pulse fully-controlled rectifier bridge circuit. The three-phase AC side of the six-pulse fully-controlled rectifier bridge circuit is respectively connected to the fifth-order single-tuned filter circuit and the incoming line switch. The fifth-order single-tuned filter circuit is used to absorb odd harmonics during the operation of the six-pulse fully-controlled rectifier bridge circuit. The six-pulse fully-controlled rectifier bridge circuit is used to output a DC voltage.

3. A high-voltage and high-power shore power supply topology device according to claim 2, characterized in that: The cascade module inverter cabinet includes a three-phase inverter bridge arm, the DC side of the three-phase inverter bridge arm is connected to the output DC side of the six-pulse full-controlled rectifier bridge circuit, each inverter bridge arm includes eight cascade modules, and the eight cascade modules are connected in sequence.

4. A high-voltage and high-power shore power supply topology device according to claim 3, characterized in that: Each of the cascade modules comprises a high-voltage DC side unit, a transformer module and a high-voltage AC side unit, and the high-voltage DC side unit, the transformer module and the high-voltage AC side unit are connected in sequence; The high-voltage DC side unit is used to invert the DC voltage into an AC voltage; The transformer module is used for electrical isolation; The high-voltage AC side unit is used to invert the AC voltage into a three-phase adjustable AC voltage.

5. A high-voltage and high-power shore power supply topology device according to claim 4, characterized in that: The high-voltage DC side unit includes a resistor R1, a capacitor C1, a capacitor C11 and a first H-bridge circuit, and the resistor R1, the capacitor C1, the capacitor C11 and the first H-bridge circuit are connected in parallel; The first H-bridge circuit includes two half-bridge IGBT modules connected in parallel.

6. A high-voltage and high-power shore power supply topology device according to claim 4, characterized in that: The high-voltage AC side unit includes a diode rectifier bridge, an inductor L1, a resistor R2, a capacitor C2, a capacitor C21, a capacitor C22 and a second H-bridge circuit, and the diode rectifier bridge and the inductor L1 are connected in parallel with the resistor R2, the capacitor C2, the capacitor C21, the capacitor C22 and the second H-bridge circuit respectively; The second H-bridge circuit includes two half-bridge IGBT modules connected in parallel.

7. A high-voltage and high-power shore power supply topology device according to claim 3, characterized in that: The isolation transformer cabinet includes an LRC filter unit and an isolation transformer. The LRC filter unit is used to filter out harmonics during inversion of the cascade module and output them to the primary side of the isolation transformer. The isolation transformer outputs a three-phase AC voltage after isolation transformation.

8. A high-voltage and high-power shore power supply topology device according to claim 2, characterized in that: The six-pulse fully-controlled rectifier bridge circuit comprises a three-phase bridge arm circuit, and each phase bridge arm circuit is composed of four thyristors connected in series.

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