CN114337336B - Electromagnetic transient simulation experiment platform for cable constant-voltage submarine observation network power supply system - Google Patents
Electromagnetic transient simulation experiment platform for cable constant-voltage submarine observation network power supply system Download PDFInfo
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Abstract
The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system comprises a shore base station power model and a power transmission and distribution model, wherein the shore base station power model is connected with the power transmission and distribution model, and the power transmission and distribution model is formed by sequentially connecting a main photoelectric composite submarine cable equivalent model, a branch unit model, a branch photoelectric composite submarine cable equivalent model, a submarine connection box power model and a load model. The invention can accurately and reliably simulate the electromagnetic transient process of the cable system constant voltage submarine observation network power supply system in normal operation state and fault.
Description
Technical Field
The invention relates to the technical field of modeling of power electronic power systems, in particular to an electromagnetic transient simulation experiment platform of a cable constant-voltage submarine observation network power supply system.
Background
The cable system submarine observation network is a 'national weight' for ocean resource development and ocean national defense construction, and is the leading edge and the high point of the development of the global ocean scientific exploration technology. Compared with the constant-current submarine observation network, the constant-voltage submarine observation network gradually becomes the main stream construction direction of each country due to the advantages of strong system expansibility and high power conversion efficiency. The research and construction of the submarine constant-voltage observation network are still in a starting stage, so that an accurate and reliable simulation experiment platform for the cable constant-voltage submarine observation network power supply system is necessary to be invented.
The current submarine observation network power supply system simulation experiment platform adopts a single technical means, the design of each module in the simulation experiment platform is not accurate enough, and the parameter structures of each module and the actual engineering are also in and out. Specifically, for example, CN201810471797 discloses an experimental platform of a cable-system power system of a submarine observation network, where a plurality of pi-type equivalent circuits are used to represent power supply submarine cables in the submarine observation network, and actually the frequency-variable characteristics of the power supply direct-current submarine cables are obvious, and if pi-type equivalent circuits are used, the electromagnetic transient characteristics of the direct-current submarine cables in a fault scene cannot be accurately reflected; in addition, the modeling of the shore-based power supply and the submarine junction box of the experimental platform is simpler, and a converter module and a corresponding control strategy are not given in detail, so that the technical problem that the shore-based power supply control process cannot be simulated exists. Zeng Xiangjun et al also propose a fault location method of an observation network based on multi-terminal fault traveling wave time difference, which is used for simulating and verifying that an experimental platform of the method does not accurately model an observation network branch unit and does not record the traveling wave distortion effect of a zener diode in the branch unit, so that the fault location method has larger error in precision.
Disclosure of Invention
The invention aims to solve the technical problems and overcome the defects of the background technology, and provides the electromagnetic transient simulation experiment platform for the cable constant-voltage submarine observation network power supply system, which can accurately and reliably simulate the electromagnetic transient process of the cable constant-voltage submarine observation network power supply system in normal operation state and fault.
The technical scheme adopted by the invention for solving the technical problems is that the electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system comprises a shore base station power model and a power transmission and distribution model, wherein the shore base station power model is connected with the power transmission and distribution model, the power transmission and distribution model is formed by sequentially connecting a main photoelectric composite submarine cable equivalent model, a branch unit model, a branch photoelectric composite submarine cable equivalent model, a submarine connection box power model and a load model, and the connection mode of the shore base station power model and the power transmission and distribution model is any one of the following modes;
the first way is: the system comprises a shore base station power model, a first power transmission and distribution model, a second power transmission and distribution model and a third power transmission and distribution model, wherein the shore base station power model comprises three power transmission and distribution models, the three power transmission and distribution models are respectively a first power transmission and distribution model, a second power transmission and distribution model and a third power transmission and distribution model, a trunk photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected with an output interface of the shore base station power model, and the second power transmission and distribution model and the third power transmission and distribution model share the same topological structure formed by sequentially connecting the trunk photoelectric composite sea cable equivalent model and a branch unit model; the main photoelectric composite submarine cable equivalent model shared by the second power transmission and distribution model and the third power transmission and distribution model is connected to the branch unit model of the first power transmission and distribution model;
the second way is: the two shore base station power models are a first shore base station power model and a second shore base station power model respectively, the two power transmission and distribution models are a first power transmission and distribution model and a second power transmission and distribution model respectively, a main photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected with an output interface of the first shore base station power model, a main photoelectric composite sea cable equivalent model of the second power transmission and distribution model is connected with an output interface of the second shore base station power model, and a branch unit model of the first power transmission and distribution model is connected with a branch unit model of the second power transmission and distribution model through the main photoelectric composite sea cable equivalent model;
third mode: the shore base station power models are two, namely a first shore base station power model and a second shore base station power model, four power transmission and distribution models are respectively a first power transmission and distribution model, a second power transmission and distribution model, a third power transmission and distribution model and a fourth power transmission and distribution model, a main photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected to an output interface of the first shore base station power model, a main photoelectric composite sea cable equivalent model of the second power transmission and distribution model is connected to an output interface of the second shore base station power model, the third power transmission and distribution model and the fourth power transmission and distribution model share the same topological structure formed by sequentially connecting a branch unit model, a branch photoelectric composite sea cable equivalent model, a submarine connection box power model and a load model, the shared branch unit model is respectively connected to a main photoelectric composite sea cable equivalent model of the third power transmission and distribution model, the main photoelectric composite sea cable equivalent model of the third power transmission and distribution model is connected to a branch unit model of the first power transmission and distribution model, and the fourth power transmission and distribution model is connected to a branch unit of the second power transmission and distribution model.
Further, the shore base station power model is formed by sequentially connecting a three-phase alternating current power supply, a converter transformer, an input protection circuit, an input voltage and current detection circuit, a full-bridge type modularized multi-level converter, an output voltage and current detection circuit and an output protection circuit; the three-phase alternating current power supply is used for representing land mains supply; the converter transformer is used for converting low-voltage alternating current into high-voltage alternating current which can be used by the full-bridge modular multilevel converter; the input voltage and current detection circuit is used for detecting input voltage and current provided by the land mains supply; the input protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the input voltage and current detection circuit; the full-bridge modular multilevel converter is used for converting power frequency alternating current electric energy provided by land mains supply into required high-voltage direct current electric energy; the output voltage and current detection circuit is used for detecting the output voltage and current of the full-bridge modular multilevel converter; the output protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the output voltage and current detection circuit.
Furthermore, the shore base station power model grounding mode adopts a converter transformer delta/Yn wiring, and the output side adopts a monopole negative polarity power transmission mode.
Further, the main photoelectric composite submarine cable equivalent model and the branch photoelectric composite submarine cable equivalent model comprise a cable core vacuum layer, a cable core conductor layer, an inner insulating layer, a conductive layer and an outer insulating layer from inside to outside.
Further, the branch unit model comprises a first control unit, a first power taking unit, a first measuring unit, a second control unit, a second power taking unit, a second measuring unit, a third measuring unit and a fourth measuring unit, wherein the first relay switch, the second relay switch, the third relay switch and the fourth relay switch; the first control unit is connected with the first electricity taking unit, the first electricity taking unit is connected with the first measuring unit, the second control unit is connected with the second electricity taking unit, the second electricity taking unit is connected with the second measuring unit, the first measuring unit is connected with the second measuring unit through a first relay switch and a second relay switch which are arranged in parallel, a left branch is led out between the first measuring unit and the first relay switch and the second relay switch which are arranged in parallel, a third measuring unit and a third relay switch are sequentially connected to the left branch, a right branch is led out between the second measuring unit and the first relay switch and the second relay switch which are arranged in parallel, and a fourth measuring unit and a fourth relay switch are connected to the right branch; the first electricity taking unit is connected to a main photoelectric composite sea cable equivalent model of one power transmission and distribution model, the third relay switch and the fourth relay switch are connected to a branch photoelectric composite sea cable equivalent model of the same power transmission and distribution model, and the second electricity taking unit is connected to a main photoelectric composite sea cable equivalent model of the other power transmission and distribution model.
Further, the contacts B and A of the first relay switch, the second relay switch and the third relay switch are connected together, the contacts A and A of the first relay switch, the second relay switch and the fourth relay switch are connected together, and the contacts B and B of the third relay switch and the fourth relay switch are connected together.
Further, the first power taking unit and the second power taking unit comprise two groups of anti-parallel diodes and a bridge rectifier circuit, one group of anti-parallel diodes are connected in reverse series with the other group of anti-parallel diodes, one input end of the bridge rectifier circuit is connected with one end of one group of anti-parallel diodes, and the other input end is connected with one end of the other group of anti-parallel diodes; the first control unit and the second control unit comprise a filter circuit and a controller, the controller is connected with the filter circuit, and the filter circuit is connected with the output end of the bridge rectifier circuit.
Further, the submarine connection box power model is formed by sequentially connecting an input protection circuit, an input voltage and current detection circuit, a synchronous rectification converter based on module stacking, an output voltage and current detection circuit and an output protection circuit; the input voltage and current detection circuit is used for detecting input voltage and current of the synchronous rectification converter based on module stacking; the input protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the input voltage and current detection circuit; the output voltage and current detection circuit is used for detecting the output voltage and current of the synchronous rectification converter based on module stacking; the output protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the output voltage and current detection circuit.
Furthermore, the synchronous rectification converter based on module stacking is formed by stacking N low-voltage low-power DC/DC isolation conversion modules in a mode that input stages are connected in series and output stages are connected in parallel, and the N low-voltage low-power DC/DC isolation conversion modules share an input filter circuit.
Further, the synchronous rectification converter based on module stacking adopts a single control strategy based on peak current control.
Compared with the prior art, the invention has the following advantages:
the shore base station power model and the submarine junction box power model have detailed internal converter modules, clear control strategies and accurate photoelectric composite submarine cable equivalent models, and the power transmission and distribution mode accords with the actual engineering condition of submarine power supply; the electromagnetic transient process during normal operation state and fault of the cable constant-voltage submarine observation network power supply system can be accurately and reliably simulated, so that a good foundation can be laid for safety and stability analysis, protection strategy and research on complex transient characteristic subject direction of the submarine cable observation network power supply system.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the structure of the shore base station power model of the embodiment shown in fig. 1.
Fig. 3 is a schematic diagram of the structure of the full-bridge modular multilevel converter of the embodiment shown in fig. 1.
Fig. 4 is a schematic structural diagram of a trunk photoelectric composite submarine cable equivalent model and a branch photoelectric composite submarine cable equivalent model according to the embodiment shown in fig. 1.
Fig. 5 is a schematic diagram of the branch unit model of the embodiment shown in fig. 1.
Fig. 6 is a schematic structural diagram of the control unit and the power taking unit in the embodiment shown in fig. 1.
Fig. 7 is a schematic diagram of the configuration of the subsea junction box power model of the embodiment of fig. 1.
Fig. 8 is a schematic diagram of the structure of the synchronous rectifier converter based on the module stack of the embodiment shown in fig. 1.
Fig. 9 is a schematic structural view of embodiment 2 of the present invention.
Fig. 10 is a schematic structural view of embodiment 3 of the present invention.
FIG. 11 is a diagram showing the output voltage U of a power model of a base station on land according to embodiment 3 of the present invention dc Output current I dc Is a simulation diagram of (a).
FIG. 12 is a measurement voltage U of a branch unit model measurement unit according to embodiment 3 of the present invention BR 、U BI 、U SP Is a simulation diagram of (a).
FIG. 13 shows the measurement current I of the branch unit model measurement unit according to embodiment 3 of the present invention BR 、I BI 、I SP Is a simulation diagram of (a).
FIG. 14 is a diagram showing the input voltage U of the power model of the subsea connection box according to embodiment 3 of the present invention JB Output voltage U JB-O Is a simulation diagram of (a).
In the figure, 21-a cable core vacuum layer, 22-a cable core conductor layer, 23-an inner insulating layer, 24-a conductive layer and 25-an outer insulating layer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and specific examples.
Example 1
Referring to fig. 1, the electromagnetic transient simulation experiment platform of the cable constant-voltage submarine observation network power supply system of the embodiment is of a single-ended chain topology structure, and comprises a shore base station power model and a power transmission and distribution model, wherein the shore base station power model is connected with the power transmission and distribution model, and the power transmission and distribution model is as follows: the power transmission and distribution model is formed by sequentially connecting a main photoelectric composite submarine cable equivalent model, a branch unit model, a branch photoelectric composite submarine cable equivalent model, a submarine junction box power model and a load model, and the connection mode of the shore base station power model and the power transmission and distribution model is as follows: the system comprises a shore base station power model, a first power transmission and distribution model, a second power transmission and distribution model and a third power transmission and distribution model, wherein the shore base station power model comprises three power transmission and distribution models, the three power transmission and distribution models are respectively a first power transmission and distribution model, a second power transmission and distribution model and a third power transmission and distribution model, a trunk photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected with an output interface of the shore base station power model, and the second power transmission and distribution model and the third power transmission and distribution model share the same topological structure formed by sequentially connecting the trunk photoelectric composite sea cable equivalent model and a branch unit model; and the trunk photoelectric composite submarine cable equivalent model shared by the second power transmission and distribution model and the third power transmission and distribution model is connected to the branch unit model of the first power transmission and distribution model.
Referring to fig. 2, the shore base station power model is formed by sequentially connecting a three-phase alternating current power supply, a converter transformer, an input protection circuit, an input voltage and current detection circuit, a full-bridge modular multilevel converter, an output voltage and current detection circuit and an output protection circuit. The three-phase alternating current power supply is used for representing land mains supply, wherein the rated output voltage of the three-phase alternating current power supply is U_AC; the converter transformer is used for converting low-voltage alternating current into high-voltage alternating current which can be used by the full-bridge modular multilevel converter, wherein the conversion ratio of the converter transformer is TF_ra; the input voltage and current detection circuit is used for detecting input voltage and current provided by the land mains supply; the input protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the input voltage and current detection circuit; the full-bridge modular multilevel converter is used for converting power frequency alternating current energy provided by land mains supply into required high-voltage direct current energy, wherein the rated direct current voltage of the full-bridge modular multilevel converter is U_MMC, and the rated capacity of the full-bridge modular multilevel converter is S_MMC; the output voltage and current detection circuit is used for detecting the output voltage and current of the full-bridge modular multilevel converter; the output protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the output voltage and current detection circuit. The specific structure of the full-bridge modular multilevel converter is shown in fig. 3.
The shore base station power model grounding mode adopts a converter transformer delta/Yn wiring, and the output side adopts a monopole negative polarity power transmission mode; the structure accords with the power transmission and distribution mode of the observation network power supply actual engineering. The full-bridge modular multilevel converter in the shore base station power model adopts a direct current control strategy. The full-bridge modular multilevel converter has the advantages of low dynamic voltage equalizing requirement of consistent triggering of devices, high output voltage waveform quality and the like, and active and reactive power control and inner loop current decoupling can be realized by adopting a direct current control strategy.
Referring to fig. 4, the trunk photoelectric composite submarine cable equivalent model and the branch photoelectric composite submarine cable equivalent model comprise a cable core vacuum layer 21, a cable core conductor layer 22, an inner insulation layer 23, a conductive layer 24 and an outer insulation layer 25 from inside to outside, wherein the radiuses of the cable core vacuum layer 21, the cable core conductor layer 22, the inner insulation layer 23, the conductive layer 24 and the outer insulation layer 25 are respectively r_cv, r_cc, r_ii, r_c and r_io, the resistivities of the cable core conductor layer 22 and the conductive layer 24 are respectively r_cc and r_c, and the relative magnetic conductivities of the cable core conductor layer 22, the inner insulation layer 23, the conductive layer 24 and the outer insulation layer 25 are respectively p_cc, p_ii, p_c and p_io, and the photoelectric composite submarine cable equivalent model is used for simulating the electric quantity operation conditions of the photoelectric composite submarine cable.
The main photoelectric composite sea cable equivalent model between the shore base station power model and the branch unit model is a photoelectric composite sea cable-main cable, and the branch photoelectric composite sea cable equivalent model between the branch unit model and the submarine connection box power model is a photoelectric composite sea cable-branch cable. The lengths of the photoelectric composite submarine cables and the main cable are the same, and are L_Bb; the lengths of the photoelectric composite submarine cable and the branch cable are the same, and the lengths of the photoelectric composite submarine cable and the branch cable are L_Spur.
Referring to fig. 5, the branching unit model includes a first control unit, a first power taking unit, a first measurement unit, a second control unit, a second power taking unit, a second measurement unit, a third measurement unit, and a fourth measurement unit, a first relay switch prn.1, a second relay switch prn.2, a third relay switch prn.3, and a fourth relay switch prn.4, the first control unit is connected to the first power taking unit, the first power taking unit is connected to the first measurement unit, the second control unit is connected to the second power taking unit, the second power taking unit is connected to the second measurement unit, the first measurement unit is connected to the second measurement unit through a first relay switch prn.1 and a second relay switch prn.2 arranged in parallel, the first measurement unit is connected to a first relay switch prn.1 and a second relay switch prn.2 arranged in parallel, a left branch is led out between the third measurement unit and the third relay switch prn.3 is sequentially connected to a left branch, and the second measurement unit is connected to a right relay switch prn.2, and a third relay switch prn.3 arranged in parallel, and the second branch is led out from the first branch and the fourth relay switch prn.2; the first electricity taking unit is connected to a main photoelectric composite sea cable equivalent model of one power transmission and distribution model, the third relay switch PRn.3 and the fourth relay switch PRn.4 are connected to a branch photoelectric composite sea cable equivalent model of the same power transmission and distribution model, and the second electricity taking unit is connected to a main photoelectric composite sea cable equivalent model of another power transmission and distribution model.
The first relay switch PR n.1, the contact B of the second relay switch PR n.2 and the contact a of the third relay switch PR n.3 are connected together, the first relay switch PR n.1, the contact a of the second relay switch PR n.2 and the contact a of the fourth relay switch PR n.4 are connected together, and the contact B of the third relay switch PR n.3 and the contact B of the fourth relay switch PR n.4 are connected together.
The first electricity taking unit is used for supplying power to the first control unit, the second electricity taking unit is used for supplying power to the second control unit, each control unit is connected or disconnected with a main photoelectric composite sea cable equivalent model or a branch photoelectric composite sea cable equivalent model connected with each branch unit model through program control on or off of each relay switch, and the main photoelectric composite sea cable equivalent model or the branch photoelectric composite sea cable equivalent model can be used for changing the topological structure of the submarine observation network and cutting off fault branches when line faults are realized.
The first control unit controls the first relay switch PRn.1, the second relay switch PRn.2 and the third relay switch PRn.3 to be closed and opened, the second control unit controls the first relay switch PRn.1, the second relay switch PRn.2 and the fourth relay switch PRn.4 to be closed and opened, for example, left faults, and the first control unit controls the first relay switch PRn.1, the second relay switch PRn.2 and the third relay switch PRn.3 to be opened, and the right connecting branch cable operates; the right fault, the second control unit controls the first relay switch PRn.1, the second relay switch PRn.2 and the fourth relay switch PRn.4 to be disconnected, and the left connection branch cable operates; and when the branch cable fails, the first control unit controls the third relay switch PRn.3 to be opened, and the second control unit controls the fourth relay switch PRn.4 to be opened.
The first relay switch PRn.1, the second relay switch PRn.2, the third relay switch PRn.3 and the fourth relay switch PRn.4 are all vacuum electromagnetic relays and are all in an off state before starting.
Referring to fig. 6, the first power taking unit and the second power taking unit each include two groups of anti-parallel diodes and a bridge rectifier circuit, wherein one group of anti-parallel diodes is in anti-series connection with the other group of anti-parallel diodes, one input end of the bridge rectifier circuit is connected to one end of one group of anti-parallel diodes, and the other input end is connected to one end of the other group of anti-parallel diodes; the first control unit and the second control unit both comprise a filter circuit and a controller, the controller is connected with the filter circuit, the filter circuit is connected with the output end of the bridge rectifier circuit, and the output of the bridge rectifier circuit is processed by the filter circuit and then supplies power to the controller.
Referring to fig. 7, the subsea connection box power model is formed by sequentially connecting an input protection circuit, an input voltage and current detection circuit, a synchronous rectification converter based on module stacking, an output voltage and current detection circuit and an output protection circuit, wherein the input voltage and current detection circuit is used for detecting the input voltage and current of the synchronous rectification converter based on module stacking; the input protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the input voltage and current detection circuit; the output voltage and current detection circuit is used for detecting the output voltage and current of the synchronous rectification converter based on module stacking; the output protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the output voltage and current detection circuit.
Wherein, the rated capacity of the synchronous rectification converter based on module stacking is S_src; referring to fig. 8, a synchronous rectification converter based on module stacking is formed by stacking N low-voltage low-power DC/DC isolation conversion modules in a mode that input stages are connected in series and output stages are connected in parallel, and the N low-voltage low-power DC/DC isolation conversion modules share an input filter circuit; in this embodiment, N is 5, and the low-voltage low-power DC/DC isolation conversion module is formed by connecting 2 double-tube forward converters in series at the input end and connecting the output ends in parallel, and shares the same output filter circuit. Synchronous rectification converters based on module stacking are adopted in the submarine connection box power model, synchronous PWM signals are provided based on peak current control, and each low-voltage low-power double-tube forward converter is driven by the synchronous signals to realize natural current sharing and voltage sharing.
Synchronous rectification converters based on module stacking in subsea junction box power models employ a single control strategy based on peak current control.
The load model is a constant impedance model and is used for simulating the seabed electricity load represented by a seabed scientific observation instrument.
The electric quantity detection unit of the input voltage and current detection circuit, the electric quantity detection unit of the output voltage and current detection circuit and the voltage detection and current detection in the measurement unit of the branch unit adopt a Hall voltage sensor and a Hall current sensor respectively.
Example 2
Referring to fig. 9, the electromagnetic transient simulation experiment platform of the cable constant-voltage submarine observation network power supply system of the embodiment is a double-end annular two-node topology structure, and the difference from embodiment 1 is that: the connection mode of the shore base station power model and the power transmission and distribution model is as follows: the shore base station power models are two, namely a first shore base station power model and a second shore base station power model, the power transmission and distribution models are two, namely a first power transmission and distribution model and a second power transmission and distribution model, the trunk photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected to the output interface of the first shore base station power model, the trunk photoelectric composite sea cable equivalent model of the second power transmission and distribution model is connected to the output interface of the second shore base station power model, and the branch unit model of the first power transmission and distribution model is connected with the branch unit model of the second power transmission and distribution model through the trunk photoelectric composite sea cable equivalent model. The procedure is as in example 1.
Example 3
Referring to fig. 10, the electromagnetic transient simulation experiment platform of the cable constant-voltage submarine observation network power supply system of the embodiment is a double-end annular three-node topology structure, and the difference from embodiment 1 is that: the connection mode of the shore base station power model and the power transmission and distribution model is as follows: the shore base station power models are two, namely a first shore base station power model and a second shore base station power model, four power transmission and distribution models are respectively a first power transmission and distribution model, a second power transmission and distribution model, a third power transmission and distribution model and a fourth power transmission and distribution model, a main photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected to an output interface of the first shore base station power model, a main photoelectric composite sea cable equivalent model of the second power transmission and distribution model is connected to an output interface of the second shore base station power model, the third power transmission and distribution model and the fourth power transmission and distribution model share the same topological structure formed by sequentially connecting a branch unit model, a branch photoelectric composite sea cable equivalent model, a submarine connection box power model and a load model, the shared branch unit model is respectively connected to a main photoelectric composite sea cable equivalent model of the third power transmission and distribution model, the main photoelectric composite sea cable equivalent model of the third power transmission and distribution model is connected to a branch unit model of the first power transmission and distribution model, and the fourth power transmission and distribution model is connected to a branch unit of the second power transmission and distribution model. The procedure is as in example 1.
The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system is built according to the double-end annular three-node topological structure of the embodiment 3. Specific parameters of a shore base station power model, a main photoelectric composite sea cable equivalent model, a branch photoelectric composite sea cable equivalent model, a submarine connection box power model and a load model are adjusted so as to achieve the aim that the output voltage and the output current of the shore base station power model respectively reach rated values U R 、I R And an output current ripple ratio of less than 3% and an output voltage ripple ratio of less than 5% ".
The simulation experiment platform is built in PSCAD/EMTDC software, and simulation experiment wave recording is given to verify the correctness of the simulation experiment platform shown in the invention.
The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system in the embodiment 3 of the invention is built on PSCAD/EMTDC software, wherein key parameters of the submarine observation network power supply system and parameters of a frequency-dependent parameter model of a photoelectric composite submarine cable equivalent model are shown in tables 1 and 2 respectively.
Table 1 key parameters of power supply system for submarine observation network
TABLE 2 frequency-dependent parameter model parameters of photoelectric composite sea cable equivalent model
| Parameters (parameters) | (symbol) | Numerical value | |
| Radius of cable core vacuum layer | r_cv | 1.145mm | |
| Radius of cable core conductor layer | r_cc | 2.560mm | |
| Radius of inner insulating layer | r_ii | 8.510mm | |
| Radius of conductive layer | r_c | 9.120mm | |
| Radius of outer insulating layer | r_io | 9.900mm | |
| Resistivity of conductor layer of cable core | R_cc | 6.4e -5 Ω·mm | |
| Resistivity of conductive layer | R_c | 2.2e -4 Ω·mm | |
| Relative permeability of cable core conductor layer | p_cc | 9.0788 | |
| Inner insulating layer | p_ii | 1 | |
| Relative permeability of | p_c | 1 | |
| Relative permeability of outer insulating | p_io | 1 |
Experimental recordings were simulated on PSCAD/EMTDC as shown in fig. 11-14, with a simulation step size of 25us. The invention selects 10s to 12s from the beginning of the simulationFor the schematic time period, the shore base station power model outputs the voltage U dc Output current I dc Is shown in fig. 11; measurement unit of branch unit model measures voltage U BR 、U BI 、U SP As shown in FIG. 12, the measurement unit of the branch unit model measures the current I BR 、I BI 、I SP The simulation diagram of (1) is shown in FIG. 13, wherein the first measuring unit measures the electric quantity U BR 、I BR The second measuring unit measures the electric quantity U BI 、I BI The third measuring unit and the fourth measuring unit measure the electric quantity U SP 、I SP The method comprises the steps of carrying out a first treatment on the surface of the Submarine junction box power model input voltage U of first power transmission and distribution model JB Output voltage U JB-O A simulated schematic of (2) is shown in figure 14.
The invention discloses a simulation experiment platform of a cable constant-voltage submarine observation network power supply system, which consists of a shore base station power model, a main photoelectric composite submarine cable equivalent model, a branch unit model, a branch photoelectric composite submarine cable equivalent model, a submarine connection box power model and a load model, wherein the shore base station power model is connected with a delta/Yn wire by a converter transformer in a grounding mode, and an output side is connected with a monopole negative polarity power transmission mode. In terms of control strategy, a full-bridge modular multilevel converter in a shore base station power model adopts a direct current control strategy, and a synchronous rectification converter based on module stacking in a submarine junction box power model adopts a single control strategy based on peak current control, which are mutually cooperated.
The shore base station power model and the submarine junction box power model of the simulation experiment platform are internally provided with a converter module in detail, a control strategy is clear, a branch unit adopts a novel power electronic topological structure, a photoelectric composite submarine cable equivalent model is accurate, and a power transmission and distribution mode accords with the actual engineering condition of submarine power supply; the electromagnetic transient process during normal operation state and fault of the cable constant-voltage submarine observation network power supply system can be accurately and reliably simulated, so that a good foundation can be laid for safety and stability analysis, protection strategy and research on complex transient characteristic subject direction of the submarine cable observation network power supply system.
Various modifications and variations of the present invention may be made by those skilled in the art, and, provided that they are within the scope of the appended claims and their equivalents, they are also within the scope of the present invention.
What is not described in detail in the specification is prior art known to those skilled in the art.
Claims (7)
1. The utility model provides a cable system constant voltage submarine observation network power supply system electromagnetism transient state simulation experiment platform, includes shore basic station electric power model and power transmission and distribution model, and shore basic station electric power model and power transmission and distribution model are connected, its characterized in that: the power transmission and distribution model is formed by sequentially connecting a main photoelectric composite sea cable equivalent model, a branch unit model, a branch photoelectric composite sea cable equivalent model, a submarine connection box power model and a load model, wherein the connection mode of a shore base station power model and the power transmission and distribution model is any one of the following modes;
the first way is: the system comprises a shore base station power model, a first power transmission and distribution model, a second power transmission and distribution model and a third power transmission and distribution model, wherein the shore base station power model comprises three power transmission and distribution models, the three power transmission and distribution models are respectively a first power transmission and distribution model, a second power transmission and distribution model and a third power transmission and distribution model, a trunk photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected with an output interface of the shore base station power model, and the second power transmission and distribution model and the third power transmission and distribution model share the same topological structure formed by sequentially connecting the trunk photoelectric composite sea cable equivalent model and a branch unit model; the main photoelectric composite submarine cable equivalent model shared by the second power transmission and distribution model and the third power transmission and distribution model is connected to the branch unit model of the first power transmission and distribution model;
the second way is: the two shore base station power models are a first shore base station power model and a second shore base station power model respectively, the two power transmission and distribution models are a first power transmission and distribution model and a second power transmission and distribution model respectively, a main photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected with an output interface of the first shore base station power model, a main photoelectric composite sea cable equivalent model of the second power transmission and distribution model is connected with an output interface of the second shore base station power model, and a branch unit model of the first power transmission and distribution model is connected with a branch unit model of the second power transmission and distribution model through the main photoelectric composite sea cable equivalent model;
third mode: the shore base station power models are two, namely a first shore base station power model and a second shore base station power model, four power transmission and distribution models are respectively a first power transmission and distribution model, a second power transmission and distribution model, a third power transmission and distribution model and a fourth power transmission and distribution model, a main photoelectric composite sea cable equivalent model of the first power transmission and distribution model is connected to an output interface of the first shore base station power model, a main photoelectric composite sea cable equivalent model of the second power transmission and distribution model is connected to an output interface of the second shore base station power model, the third power transmission and distribution model and the fourth power transmission and distribution model share the same topological structure formed by sequentially connecting a branch unit model, a branch photoelectric composite sea cable equivalent model, a submarine connection box power model and a load model, the shared branch unit model is respectively connected to a main photoelectric composite sea cable equivalent model of the third power transmission and distribution model, the main photoelectric composite sea cable equivalent model of the third power transmission and distribution model is connected to a branch unit model of the first power transmission and distribution model, and the fourth power transmission and distribution model is connected to a branch unit model of the second power transmission and distribution model;
the shore base station power model is formed by sequentially connecting a three-phase alternating current power supply, a converter transformer, an input protection circuit, an input voltage and current detection circuit, a full-bridge modular multilevel converter, an output voltage and current detection circuit and an output protection circuit; the three-phase alternating current power supply is used for representing land mains supply; the converter transformer is used for converting low-voltage alternating current into high-voltage alternating current which can be used by the full-bridge modular multilevel converter; the input voltage and current detection circuit is used for detecting input voltage and current provided by the land mains supply; the input protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the input voltage and current detection circuit; the full-bridge modular multilevel converter is used for converting power frequency alternating current electric energy provided by land mains supply into required high-voltage direct current electric energy; the output voltage and current detection circuit is used for detecting the output voltage and current of the full-bridge modular multilevel converter; the output protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the output voltage and current detection circuit;
the branch unit model comprises a first control unit, a first power taking unit, a first measuring unit, a second control unit, a second power taking unit, a second measuring unit, a third measuring unit and a fourth measuring unit, wherein the first relay switch, the second relay switch, the third relay switch and the fourth relay switch; the first control unit is connected with the first electricity taking unit, the first electricity taking unit is connected with the first measuring unit, the second control unit is connected with the second electricity taking unit, the second electricity taking unit is connected with the second measuring unit, the first measuring unit is connected with the second measuring unit through a first relay switch and a second relay switch which are arranged in parallel, a left branch is led out between the first measuring unit and the first relay switch and the second relay switch which are arranged in parallel, a third measuring unit and a third relay switch are sequentially connected to the left branch, a right branch is led out between the second measuring unit and the first relay switch and the second relay switch which are arranged in parallel, and a fourth measuring unit and a fourth relay switch are connected to the right branch; the first power taking unit is connected to a main photoelectric composite sea cable equivalent model of one power transmission and distribution model, the third relay switch and the fourth relay switch are connected to a branch photoelectric composite sea cable equivalent model of the same power transmission and distribution model, and the second power taking unit is connected to a main photoelectric composite sea cable equivalent model of the other power transmission and distribution model;
the submarine connection box power model is formed by sequentially connecting an input protection circuit, an input voltage and current detection circuit, a synchronous rectification converter based on module stacking, an output voltage and current detection circuit and an output protection circuit; the input voltage and current detection circuit is used for detecting input voltage and current of the synchronous rectification converter based on module stacking; the input protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the input voltage and current detection circuit; the output voltage and current detection circuit is used for detecting the output voltage and current of the synchronous rectification converter based on module stacking; the output protection circuit judges whether overvoltage or undervoltage exists or not through the voltage value detected by the output voltage and current detection circuit.
2. The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system as claimed in claim 1, wherein: the shore base station power model grounding mode adopts a converter transformer delta/Yn wiring, and the output side adopts a monopole negative polarity power transmission mode.
3. The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system as claimed in claim 1 or 2, wherein the electromagnetic transient simulation experiment platform is characterized in that: the main photoelectric composite submarine cable equivalent model and the branch photoelectric composite submarine cable equivalent model comprise a cable core vacuum layer, a cable core conductor layer, an inner insulating layer, a conductive layer and an outer insulating layer from inside to outside.
4. The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system as claimed in claim 1, wherein: the contact B of the first relay switch, the contact B of the second relay switch and the contact A of the third relay switch are connected together, the contact A of the first relay switch, the contact A of the second relay switch and the contact A of the fourth relay switch are connected together, and the contact B of the third relay switch and the contact B of the fourth relay switch are connected together.
5. The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system as claimed in claim 1, wherein: the first power taking unit and the second power taking unit comprise two groups of anti-parallel diodes and a bridge rectifier circuit, wherein one group of anti-parallel diodes are connected in reverse series with the other group of anti-parallel diodes, one input end of the bridge rectifier circuit is connected with one end of one group of anti-parallel diodes, and the other input end is connected with one end of the other group of anti-parallel diodes; the first control unit and the second control unit comprise a filter circuit and a controller, the controller is connected with the filter circuit, and the filter circuit is connected with the output end of the bridge rectifier circuit.
6. The tethered constant pressure seafloor viewer of claim 1The electromagnetic transient simulation experiment platform of the network power supply system is characterized in that: the synchronous rectification converter based on the module stack is composed ofNThe low-voltage low-power DC/DC isolation conversion modules are stacked in a mode that input stages are connected in series and output stages are connected in parallel,Nthe low-voltage low-power DC/DC isolation conversion modules share an input filter circuit.
7. The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system as claimed in claim 1, wherein: the synchronous rectification converter based on module stacking adopts a single control strategy based on peak current control.
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