CN112350300B - Deepwater power supply device based on three-level inverter - Google Patents
Deepwater power supply device based on three-level inverter Download PDFInfo
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- CN112350300B CN112350300B CN202011252532.6A CN202011252532A CN112350300B CN 112350300 B CN112350300 B CN 112350300B CN 202011252532 A CN202011252532 A CN 202011252532A CN 112350300 B CN112350300 B CN 112350300B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Power Engineering (AREA)
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Abstract
The invention discloses a deepwater power supply device based on a three-level inverter, which is arranged in a seabed main base station and is used for converting high-voltage direct current transmitted from a shore-based power supply to the seabed main base station through a submarine cable into medium-voltage electric energy, and the deepwater power supply device comprises: the power conversion system comprises a direct current commutation module, a first main power conversion module, a second main power conversion module and a multifunctional load; the direct current reversing module is used for receiving bidirectional high-voltage direct current transmitted by a double-end shore-based power supply through a submarine cable, reversing the input current and then sequentially inputting the current to the first main power conversion module and the second main power conversion module; the first main power conversion module and the second main power conversion module are used for performing power conversion on input direct-current high voltage to output direct-current medium voltage, and are respectively input to the multi-functional load and the main base station control cabin; the multifunctional load is used for keeping the deepwater power supply device in constant power operation and is also used for self-checking the deepwater power supply device.
Description
Technical Field
The invention belongs to the technical field of submarine observation networks, and particularly relates to a deepwater power supply device based on a three-level inverter.
Background
The traditional ocean observation cannot carry out long-term, continuous, multi-factor and comprehensive observation on the ocean due to the restriction of energy and communication bandwidth, so that the ocean bottom observation network utilizing the modern ocean bottom communication technology is provided. The seabed observation network is upwards connected with shore-based power supply and communication equipment through equipment such as a shore base station, a submarine cable, a seabed main base station, a repeater and the like, and downwards connected with various seabed observation equipment, so that high-power continuous power supply and real-time online acquisition of observation data of the seabed observation equipment are realized. Therefore, the submarine observation network has the advantages of providing uninterrupted power supply, high-speed communication and high-precision clock synchronization, and can carry out long-term, continuous and real-time three-dimensional observation on the ocean.
The seabed main base station is one of core devices of a seabed observation network and comprises unit modules of a deepwater high-voltage high-power supply, a communication control module and the like. The deep water high-voltage high-power supply is an important constituent unit of a seabed main base station and is used for converting high-voltage direct current transmitted to the seabed main base station by a shore-based power supply through a submarine cable into medium-voltage electric energy.
The laying depth of the submarine cable can reach thousands of meters, and the laying length can reach thousands of kilometers, so that the construction difficulty is huge, the maintenance cost is extremely high, and the severe use environment requires a deep-water high-voltage high-power supply to have extremely high reliability. However, in order to reduce the loss on the line, the long-distance direct current transmission mostly adopts high-voltage and low-current transmission, and the ground common-mode voltage as high as 10-20kV provides a severe test for the withstand voltage performance of the underwater power supply. Along with the continuous expansion of the scale of a submarine observation network and the continuous increase of the distance, the power supply voltage is further increased, and along with the continuous development of submarine observation instruments, the power supply power requirement of a deep-water high-voltage high-power supply is continuously increased, a kilowatt-level main base station is already a basic requirement, a ten-kilowatt-level submarine main base station enters a development stage, and along with the increase of the power requirement, the power supply voltage is further increased.
Due to the limitation of the voltage-resisting capability of power devices, most of the existing deep-water high-voltage high-power supply solutions are in a multi-module cascade mode. The advantages are that the voltage resistance of a single module is low, the power is low, high voltage resistance and high power can be realized after cascading, and the disadvantages are that each module needs an independent transformer to realize high voltage isolation, the total volume of the power supply is large, the loss is large, and the power supply efficiency is low.
In addition, with the increase of the power consumption of the underwater main base station, the influence of load change on the fluctuation of the underwater power supply network is gradually increased while the power supply voltage is gradually increased, and the stability of the whole power network is influenced by overlarge voltage fluctuation. The existing devices generally do not pay attention to the influence of load fluctuation on the stability of the whole power supply network.
In summary, due to the great difficulty in laying and maintaining devices such as an underwater power supply and the like, the existing deepwater high-voltage high-power supply scheme cannot adapt to the gradually increased performance requirement of a submarine observation network, and has the following disadvantages:
1. with the expansion of the scale of the submarine observation network and the increase of the power supply power demand, the power supply voltage is further improved, the voltage stress of a main power circuit switch device is insufficient, and the reliability of the deep-water high-voltage high-power supply is influenced.
2. The pressure-resistant problem can be solved by a cascade continuous expansion mode, but the volume of the main power conversion part is continuously increased and is limited by the volume of a pressure-resistant cabin of the submarine equipment, meanwhile, the total loss is increased, and the power efficiency is reduced.
3. With the continuous increase of the load power of the main base station, the dynamic change of the high-power load can cause serious fluctuation to the underwater high-voltage power supply network, seriously affect the power supply stability of equipment on the whole underwater power supply network and be not beneficial to the reliable work of the seabed observation network system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and discloses a deepwater power supply device based on a three-level inverter. The device can realize reliable high-voltage power conversion, small volume and high efficiency, and has bidirectional current input and high stability of an underwater power supply system.
In order to achieve the above object, the present invention provides a deep water power supply apparatus based on a three-level inverter, provided in a subsea main base station, for converting high-voltage direct current (hvdc) transmitted from a shore-based power supply to the subsea main base station via a sea cable into medium-voltage electric power, the deep water power supply apparatus comprising: the power conversion system comprises a direct current commutation module, a first main power conversion module, a second main power conversion module and a multifunctional load; wherein the content of the first and second substances,
the direct current reversing module is used for receiving bidirectional high-voltage direct current transmitted by the double-end shore-based power supply through a submarine cable, and sequentially inputting the bidirectional high-voltage direct current to the first main power conversion module and the second main power conversion module after reversing through input current;
the first main power conversion module is used for performing power conversion on the input direct current high voltage to output direct current medium voltage, and inputting the direct current medium voltage to the multi-functional load and the main base station control cabin respectively;
the second main power conversion module is used for performing power conversion on the input direct-current high voltage to output direct-current medium voltage, and inputting the direct-current medium voltage to the multi-functional load and the main base station control cabin respectively;
the multifunctional load is used for keeping the deepwater power supply device in constant power operation and is also used for self-checking the deepwater power supply device.
As an improvement of the deepwater power supply device, the dc reversing module comprises a first diode DI1, a second diode DI2, a third diode DI3 and a fourth diode DI 4; wherein the content of the first and second substances,
the anode of the first diode DI1 is connected with the positive input of the bidirectional high-voltage direct current, and the cathode of the first diode DI1 is connected with the positive input of the first main power conversion module;
the anode of the second diode DI2 is connected to the negative input of the bidirectional high-voltage direct current, and the cathode of the first diode DI1 is connected to the positive input of the first main power conversion module;
the anode of the third diode DI3 is connected with the negative input of the second main power conversion module, and the cathode of the third diode DI3 is connected with the negative input of the bidirectional high-voltage direct current;
the anode of the fourth diode DI4 is connected to the negative input of the second main power conversion module, and the cathode of the fourth diode DI4 is connected to the positive input of the bidirectional high-voltage direct current.
As an improvement of the deepwater power supply device, the first main power conversion module and the second main power conversion module both adopt a topological structure circuit of a diode clamping type three-level inverter, and the topological structure circuit comprises a three-level inverter, a resonance circuit, a high-voltage transformer, a rectifier and an LC filter circuit which are connected in sequence, wherein a negative input of the three-level inverter of the first main power conversion module is connected with a positive input of the three-level inverter of the second main power conversion module, and the LC filter circuit of the first main power conversion module is connected in parallel with the LC filter circuit of the second main power conversion module;
each bridge arm of the three-level inverter is provided with four switching tubes, four anti-parallel diodes and two clamping diodes, a first direct-current capacitor C1 and a second direct-current capacitor C2 are arranged on the direct-current side of the three-level inverter, the voltage of each direct-current capacitor is half of the voltage of a direct-current bus, and the voltage of each switching tube is half of the voltage of the direct-current bus;
the resonant circuit is used for realizing zero-current switching conversion of the three-level inverter, reducing the switching loss of the three-level inverter and further improving the energy conversion efficiency of the deep water power supply device;
the high-voltage transformer is used for converting the input high-voltage current into medium-voltage current and outputting the medium-voltage current;
the rectifier is used for converting the medium-voltage current output by the high-voltage transformer into direct current from alternating current;
and the LC filter circuit is used for filtering direct current and outputting the direct current to the main base station control cabin and the multifunctional load.
As an improvement of the deepwater power supply device, the multifunctional load comprises a constant-power chopper circuit and a pure-resistance high-power load which are connected in series; wherein the content of the first and second substances,
the constant-power chopper circuit is in a redundancy design and comprises a power switch and a diode which are connected in parallel, and the constant-power chopper circuit and the pure-resistance high-power load are used for sharing part of power to enable the total power consumed by the deep water power supply device to be equal to the rated power when the output power of the deep water power supply device is lower than the rated power; the pure-resistance high-power load is also used for self-checking the deep water power supply device.
As an improvement of the deepwater power supply device, the pure-resistance high-power load comprises a plurality of resistors connected in parallel, the number of the resistors connected in parallel is determined by a set resistance value, and the resistance value is determined according to the set multifunctional load power.
Compared with the prior art, the invention has the advantages that:
1. according to the deepwater power supply device based on the three-level inverter, the main power circuit realizes high-withstand-voltage and high-reliability power conversion through the three-level inverter, the high-voltage isolation transformer, the rectifier and the like, the voltage stress of a power device is reduced, and the reliability of a power supply is improved; the power switching loss is reduced through the soft switch, and the power supply efficiency is improved; the high-voltage isolation of input and output is realized through a high-voltage isolation transformer;
2. compared with a cascaded main power circuit, the three-level inverter main power circuit has the advantages that the number of components such as inductors, transformers, diode rectifier bridges and the like is reduced to half of that of the cascaded main power circuit, so that the total volume of an underwater power supply and the volume of a pressure-resistant cabin of submarine equipment are greatly reduced;
3. the deepwater power supply device based on the three-level inverter provided by the invention realizes the constant power state of an underwater power supply through the multifunctional load, so that the deepwater power supply device based on the three-level inverter can adapt to various working conditions such as full load, heavy load, light load and no load, the voltage stability of the whole underwater power supply network is ensured, the system reliability is enhanced, and in addition, the whole power supply system can be tested through the self-checking state of the multifunctional load;
4. according to the deepwater power supply device based on the three-level inverter, the direct current reversing module can adapt to the input of bidirectional direct current, the input of the first main power conversion module and the input of the second main power conversion module are both forward voltages, in addition, when double-end power supply is carried out, if a cable breakage fault occurs, the power supply polarity may be reversed, the direct current reversing module can guarantee the power supply to continuously and stably work, and the robustness of the system is enhanced.
Drawings
Fig. 1 is a general block diagram of a deep water power supply device based on a three-level inverter of the invention;
FIG. 2 is a circuit schematic of the DC commutating module of FIG. 1;
FIG. 3 is a circuit schematic of the first and second main power conversion modules of FIG. 1;
fig. 4 is a circuit schematic of the multi-function load of fig. 1.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the invention provides a deep water power supply device based on a three-level inverter, which mainly comprises a direct current commutation module, a first main power conversion module, a second main power conversion module and a multifunctional load, and the composition structure is shown in fig. 1. The connection mode is as follows:
the direct-current high voltage transmitted by a shore-based power supply is connected with the input of a direct-current reversing module, the output of the direct-current reversing module is connected with the input of a main power conversion module, the main power conversion module comprises a first main power conversion module and a second main power conversion module, the input of the first main power conversion module is connected in series, the output of the first main power conversion module is connected in parallel, and the output of the main power conversion module is respectively connected with the input of a main base station control cabin and the input of a multifunctional load.
The direct-current reversing module is used for receiving bidirectional high-voltage direct current transmitted by a double-end shore-based power supply through a submarine cable, has an input current reversing function, and can supply power to the underwater main base station from the double ends.
The input sides of the main power conversion modules are connected in series, and the output sides of the main power conversion modules are connected in parallel. The main power conversion module isolates high voltage through a high voltage transformer and completes power conversion from direct current high voltage to direct current medium voltage.
The multifunctional load is formed by connecting a constant-power chopper circuit and a pure-resistive high-power load in series, and the constant-power running function and the self-checking function of the underwater power supply can be realized.
In the invention, the direct current commutation module is composed of diodes DI1, DI2, DI3 and DI4 which are connected in series and in parallel, DI1 and DI2 are connected with the positive input of the main circuit module, DI3 and DI4 are connected with the negative input of the main circuit module. As shown in fig. 2.
The input commutation process is as follows:
when the direct current input end A is positive and the end B is negative, current enters the main circuit module through the end A and the DI1 and returns to the end B through the DI3, and then the DI2 and the DI4 are in a cut-off state; similarly, when the dc input terminal B is positive and the terminal a is negative, the current enters the main circuit module through the terminal B and DI2, and returns to the terminal a through DI 4. At the moment, DI1 and DI3 are in an off state; therefore, no matter the current flows from the A end or the B end, the input of the main power circuit is positive voltage, and the deep water high-voltage high-power supply based on the three-level inverter can work normally.
In the present invention, the first and second main power conversion modules both adopt a topology structure of a diode-clamped three-level inverter, and as shown in fig. 3, each main power conversion module includes a diode-clamped three-level inverter, a resonant circuit, a high-voltage transformer, a diode rectifier bridge, and an LC filter circuit.
Three switching states of the three-level inverter are defined as P, O, N, and the a-arm of the first main power conversion module is taken as an example for explanation:
each bridge arm of the diode clamping type three-level inverter is provided with four switching tubes, four anti-parallel diodes and two clamping diodes. The dc side of the inverter has two dc capacitors (C1 and C2). The voltage on each DC capacitor is half (V) of the DC bus voltagedc/2)。
Switching state P: switch tube SA1And SA2Conduction, SA3And SA4The power is turned off and the power is turned off,
on-off state O: switch tube SA2And SA3Conduction, SA1And SA4Off, VAO＝0；
Switching state N: switch tube SA3And SA4Conduction, SA1And SA2The power is turned off and the power is turned off,
switch tube S regardless of the switch stateA1And SA3、SA2And SA4Is always opposite. Each leg has three switch states P, O, N, so there are 9 switch states for a two-phase three-level inverter. The voltage stress on each power switch is also half (V) of the DC bus voltagedcAnd/2), the requirement of the voltage-resistant grade of the power switch device is greatly reduced.
Compared with the cascading main power circuit, the three-level inverter reduces the number of power switching devices, reduces the number of components such as inductors, transformers, diode rectifier bridges and the like to half (1/2) of the cascading main power circuit, and greatly reduces the total volume of an underwater power supply and the volume of a pressure-resistant cabin of submarine equipment.
The output of the three-level inverter is connected with the LC resonance network, so that the three-level inverter can realize zero current switching conversion (ZCS), the switching loss of the three-level inverter can be reduced, and the energy conversion efficiency of a power supply is improved.
The leakage inductance and the resonance inductance of the transformer play two functions of power transmission and soft switching of the main power switch device in operation. In addition, the transformer also plays a key role in high voltage isolation, and realizes the complete isolation of the input high voltage and the output medium voltage at the two sides of the transformer.
The rectifier bridge and the filter circuit convert alternating current output by the secondary side of the transformer into direct current, and the direct current is output to the main base station control cabin or the multifunctional load after being filtered by LC.
The main power conversion module works as follows:
the high-voltage direct current flowing in through the direct current commutation module is input into a three-level inverter after passing through an inductor L1, the three-level inverter converts the direct current into high-frequency alternating current and inputs the high-frequency alternating current into a resonance circuit, the output of the resonance circuit is connected with the primary side of an isolation transformer, the secondary side of the transformer is connected with a rectifier after the voltage reduction conversion of the transformer, the high-frequency alternating current is converted into the direct current, and the direct current is output to a main base station control cabin or a multifunctional load after passing through an LC filter circuit.
The multifunctional load is formed by connecting a constant-power chopper circuit and a pure-resistance high-power load in series,
wherein, the constant power chopper circuit adopts a redundancy design as shown in fig. 4, and comprises an input capacitor CO3Parallel power switch QO1、QO2And a parallel diode DO1、DO2Inductance LOAnd an output capacitor CO4。
The pure-resistance high-power load is formed by connecting a plurality of resistors in parallel to output a fixed resistance value, the number of the resistors in parallel and the resistance value of each resistor are determined by the fixed resistance value to be output, and the fixed resistance value is determined according to the required multifunctional load power.
The power supply works in a state that the output power is lower than the rated power, namely a constant power state, at the moment, the multifunctional load is used as a dissipation load, the total power consumed by the whole power supply is still the rated power, the constant power state can ensure that the power supply is still kept in a constant power output state when the switching of the load of the main base station is changed, the voltage and the current of the input end of the power supply are kept stable, the fluctuation of the high-power load change on an underwater high-voltage power supply network is favorably reduced, the voltage stability of the whole power supply network is kept, and the reliability is improved.
The working process under the constant power state is as follows:
when the power supply works in a state that the output power is lower than the rated power, the power supply works in a constant power state, and at the moment, the multifunctional load shares part of power, so that the total output power of the power supply is ensured to be a constant value, for example, the total output effective power is set to be 10kW, the control cabin needs 5kW power, and at the moment, the multifunctional load dissipates redundant 5kW power on the high-power load through a chopper circuit; if the required power of the control cabin is increased from 5kW to 7kW at a certain moment, the multifunctional load quickly adjusts the dissipated power of the high-power load through the high-frequency chopper circuit and reduces the power to 3kW, and the total output is continuously kept to 10 kW. The constant power working state ensures that the input voltage and the input current of the underwater power supply are basically kept unchanged and are maintained in a constant working state, so that the stable operation of the submarine power supply network is realized.
When the main power stops running, the power supply can independently utilize the multifunctional load to work, and the state is called a self-checking state. The multifunctional load is used as a self-checking load, and the working performance of each main power conversion module of the power supply can be tested and detected. The method is applied to the working conditions of self-checking, fault recovery, restart and the like.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A deep water power supply device based on a three-level inverter is arranged in a seabed main base station and used for converting high-voltage direct current transmitted from a shore-based power supply to the seabed main base station through a submarine cable into medium-voltage electric energy, and is characterized by comprising: the power conversion system comprises a direct current commutation module, a first main power conversion module, a second main power conversion module and a multifunctional load; wherein the content of the first and second substances,
the direct current reversing module is used for receiving bidirectional high-voltage direct current transmitted by the double-end shore-based power supply through a submarine cable, and sequentially inputting the bidirectional high-voltage direct current to the first main power conversion module and the second main power conversion module after reversing through input current;
the first main power conversion module is used for performing power conversion on the input direct current high voltage to output direct current medium voltage, and inputting the direct current medium voltage to the multi-functional load and the main base station control cabin respectively;
the second main power conversion module is used for performing power conversion on the input direct-current high voltage to output direct-current medium voltage, and inputting the direct-current medium voltage to the multi-functional load and the main base station control cabin respectively;
the multifunctional load is used for keeping the deep water power supply device to operate at constant power and is also used for self-checking the deep water power supply device;
the direct current commutation module comprises a first diode DI1, a second diode DI2, a third diode DI3 and a fourth diode DI 4; wherein the content of the first and second substances,
the anode of the first diode DI1 is connected with the positive input of the bidirectional high-voltage direct current, and the cathode of the first diode DI1 is connected with the positive input of the first main power conversion module;
the anode of the second diode DI2 is connected to the negative input of the bidirectional high-voltage direct current, and the cathode of the first diode DI1 is connected to the positive input of the first main power conversion module;
the anode of the third diode DI3 is connected with the negative input of the second main power conversion module, and the cathode of the third diode DI3 is connected with the negative input of the bidirectional high-voltage direct current;
the anode of the fourth diode DI4 is connected to the negative input of the second main power conversion module, and the cathode of the fourth diode DI4 is connected to the positive input of the bidirectional high-voltage direct current;
the first main power conversion module and the second main power conversion module both adopt topological structure circuits of diode clamping type three-level inverters, and each topological structure circuit comprises a three-level inverter, a resonance circuit, a high-voltage transformer, a rectifier and an LC (inductance-capacitance) filter circuit which are sequentially connected, wherein the negative input of the three-level inverter of the first main power conversion module is connected with the positive input of the three-level inverter of the second main power conversion module, and the LC filter circuit of the first main power conversion module is connected with the LC filter circuit of the second main power conversion module in parallel;
each bridge arm of the three-level inverter is provided with four switching tubes, four anti-parallel diodes and two clamping diodes, a first direct-current capacitor C1 and a second direct-current capacitor C2 are arranged on the direct-current side of the three-level inverter, the voltage of each direct-current capacitor is half of the voltage of a direct-current bus, and the voltage of each switching tube is half of the voltage of the direct-current bus;
the resonant circuit is used for realizing zero-current switching conversion of the three-level inverter, reducing the switching loss of the three-level inverter and further improving the energy conversion efficiency of the deep water power supply device;
the high-voltage transformer is used for converting the input high-voltage current into medium-voltage current and outputting the medium-voltage current;
the rectifier is used for converting the medium-voltage current output by the high-voltage transformer into direct current from alternating current;
the LC filter circuit is used for filtering direct current and outputting the direct current to the main base station control cabin and the multifunctional load;
the multifunctional load comprises a constant-power chopper circuit and a pure resistive high-power load which are connected in series; wherein the content of the first and second substances,
the constant-power chopper circuit is in a redundancy design and comprises a power switch and a diode which are connected in parallel, and the constant-power chopper circuit and the pure-resistance high-power load are used for sharing part of power to enable the total power consumed by the deep water power supply device to be equal to the rated power when the output power of the deep water power supply device is lower than the rated power; the pure-resistance high-power load is also used for self-checking the deep water power supply device.
2. The deep water power supply device based on the three-level inverter as claimed in claim 1, wherein the pure resistive high-power load comprises a plurality of resistors connected in parallel, the number of the resistors connected in parallel is determined by a set resistance value, and the resistance value is determined according to the set power of the multifunctional load.
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| EP3126182A1 (en) * | 2014-03-31 | 2017-02-08 | ThyssenKrupp Marine Systems GmbH | Circuit arrangement for electrically connecting at least one fuel cell system and at least one rechargeable battery to a propulsion network of an underwater vehicle |
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