CN114337336A - Electromagnetic transient simulation experiment platform for cable system constant-voltage submarine observation network power supply system - Google Patents
Electromagnetic transient simulation experiment platform for cable system constant-voltage submarine observation network power supply system Download PDFInfo
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Abstract
The electromagnetic transient simulation experiment platform 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 junction box power model and a load model, and the shore base station power model and the power transmission and distribution model are connected in three modes. The simulation method can accurately and reliably simulate the electromagnetic transient process of the cable system constant-voltage submarine observation network power supply system in the normal operation state and the fault.
Description
Technical Field
The invention relates to the technical field of power system modeling of power electronics, in particular to an electromagnetic transient simulation experiment platform of a cable system constant-voltage submarine observation network power supply system.
Background
The cable system seabed observation network is a national repeater for ocean resource development and ocean national defense construction, and is the leading edge and the highest 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 mainstream construction direction of each country due to the advantages of strong system expansibility and high power conversion efficiency. The research and construction of the seabed constant-voltage observation network are still in a starting stage, so that an accurate and reliable simulation experiment platform for the cable system constant-voltage seabed observation network power supply system is needed to be invented.
The technical means adopted by the current power supply system simulation experiment platform of the seabed observation network is single, the design of each module in the simulation experiment platform is not detailed and accurate enough, and the parameter structures of each module and the actual engineering are in and out. Specifically, for example, CN201810471797 discloses an experiment platform of a cable-system submarine observation network power system, where the experiment platform uses a plurality of pi-type equivalent circuits to represent a power supply submarine cable in a submarine observation network, and actually, the frequency-dependent characteristics of the power supply direct-current submarine cable are obvious, and if the pi-type equivalent circuits are used, the electromagnetic transient characteristics of the direct-current submarine cable in a fault scene cannot be accurately reflected; in addition, the modeling of the shore-based power supply and the seabed connection box of the experimental platform is simple, and a current conversion 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 provides an observation network fault positioning method based on multi-terminal fault traveling wave time difference, and an experimental platform for simulation verification of the method does not accurately model a branch unit of an observation network and does not remember the traveling wave distortion effect of a voltage stabilizing diode in the branch unit, so that the fault positioning method has large errors in precision.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide an electromagnetic transient simulation experiment platform for a cable system constant-voltage submarine observation network power supply system, which can accurately and reliably simulate the electromagnetic transient process of the cable system constant-voltage submarine observation network power supply system in a normal operation state and a fault.
The electromagnetic transient simulation experiment platform 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 junction box power model and a load model, and the shore base station power model and the power transmission and distribution model are connected in any one of the following manners;
the first mode is as follows: the shore base station power model comprises three transmission and distribution models, namely a first transmission and distribution model, a second transmission and distribution model and a third transmission and distribution model, wherein a trunk photoelectric composite submarine cable equivalent model of the first transmission and distribution model is connected to an output interface of the shore base station power model, and the second transmission and distribution model and the third transmission and distribution model share the same topological structure formed by sequentially connecting the trunk photoelectric composite submarine cable equivalent model and a branch unit model; a 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;
the second mode is as follows: the shore base station power models comprise a first shore base station power model and a second shore base station power model, the transmission and distribution models comprise two, namely a first transmission and distribution model and a second transmission and distribution model, a trunk photoelectric composite submarine cable equivalent model of the first transmission and distribution model is connected to an output interface of the first shore base station power model, a trunk photoelectric composite submarine cable equivalent model of the second transmission and distribution model is connected to an output interface of the second shore base station power model, and a branch unit model of the first transmission and distribution model is connected with a branch unit model of the second transmission and distribution model through the trunk photoelectric composite submarine cable equivalent model;
the third mode is as follows: the shore base station power models are respectively a first shore base station power model and a second shore base station power model, the transmission and distribution model is four, the transmission and distribution model is respectively a first transmission and distribution model, a second transmission and distribution model, a third transmission and distribution model and a fourth transmission and distribution model, a trunk photoelectric composite submarine cable equivalent model of the first transmission and distribution model is connected to an output interface of the first shore base station power model, a trunk photoelectric composite submarine cable equivalent model of the second transmission and distribution model is connected to an output interface of the second shore base station power model, the third transmission and distribution model and the fourth transmission and distribution model share the same topological structure formed by sequentially connecting a branch unit model, a branch photoelectric composite submarine cable equivalent model, a submarine junction box power model and a load model, the shared branch unit models are respectively connected to trunk photoelectric composite submarine cable equivalent models of the third transmission and distribution model and the fourth transmission and distribution model, the trunk photoelectric composite submarine cable equivalent model of the third power transmission and distribution model is connected to the branch unit model of the first power transmission and distribution model, and the trunk photoelectric composite submarine cable equivalent model of the fourth power transmission and distribution model is connected to the branch unit model 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 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 commercial power; 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 commercial power; the input protection circuit judges whether overvoltage or undervoltage phenomena exist or not according to 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 a land commercial power 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 phenomena exist 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 converter transformer delta/Yn wiring, and the output side adopts a single-pole 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 conducting 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, a fourth measuring unit, a first relay switch, a second relay switch, a third relay switch and a fourth relay switch; the first control unit is connected with the first power taking unit, the first power taking unit is connected with the first measuring unit, the second control unit is connected with the second power taking unit, the second power 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, the third measuring unit and the third relay switch are sequentially connected onto 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 the fourth measuring unit and the fourth relay switch are connected onto the right branch in turn; the first power taking unit is connected to a trunk photoelectric composite submarine 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 submarine cable equivalent model of the same power transmission and distribution model, and the second power taking unit is connected to a trunk photoelectric composite submarine cable equivalent model of the other power transmission and distribution model.
Further, the contact B of the first relay switch and the contact A of the second relay switch are connected together with the contact A of the third relay switch, the contact A of the first relay switch and the contact A of the second relay switch are connected together with the contact A of the fourth relay switch, and the contact B of the third relay switch is connected together with the contact B of the fourth relay switch.
Furthermore, the first power taking unit and the second power taking unit respectively comprise two groups of anti-parallel diodes and a bridge rectifier circuit, one group of anti-parallel diodes is reversely connected with the other group of anti-parallel diodes in series, 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 of the bridge rectifier circuit 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, and the filter circuit is connected with the output end of the bridge rectifier circuit.
Further, the seabed junction 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 the input voltage and current of the synchronous rectification converter based on module stacking; the input protection circuit judges whether overvoltage or undervoltage phenomena exist or not according to 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 phenomena exist 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 of series input stage connection and parallel output stage connection, and the N low-voltage low-power DC/DC isolation conversion modules share one input filter circuit.
Further, the module stack based synchronous rectifier converter 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 seabed connection box power model have detailed internal current conversion modules, clear control strategy, novel power electronic topological structure adopted by the branch unit, accurate photoelectric composite submarine cable equivalent model and transmission and distribution mode according with the practical engineering condition of seabed power supply; the method can accurately and reliably simulate the normal operation state and the electromagnetic transient process of the cable system constant-voltage submarine observation network power supply system during fault, thereby laying a good foundation for the safety and stability analysis, the protection strategy and the study of the 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 structural diagram of a shore-based station power model of the embodiment shown in fig. 1.
Fig. 3 is a schematic structural diagram of the full-bridge modular multilevel converter of the embodiment shown in fig. 1.
Fig. 4 is a schematic structural diagram of the trunk photoelectric composite submarine cable equivalent model and the branch photoelectric composite submarine cable equivalent model according to the embodiment shown in fig. 1.
Fig. 5 is a schematic structural diagram of the branching 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 structural diagram of a subsea junction box power model of the embodiment shown in fig. 1.
Fig. 8 is a schematic structural diagram of the synchronous rectification converter based on module stacking according to 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 shows an output voltage U of a shore-based station power model in embodiment 3 of the present inventiondcOutput current IdcA simulation schematic of (a).
FIG. 12 shows a branch unit model measuring unit for measuring voltage U according to embodiment 3 of the present inventionBR、UBI、USPA simulation schematic of (a).
FIG. 13 shows a branch unit model measuring unit measuring current I according to embodiment 3 of the present inventionBR、IBI、ISPA simulation schematic of (a).
FIG. 14 shows an input voltage U of the power model of the subsea connection box in embodiment 3 of the present inventionJBOutput voltage UJB-OA simulation schematic of (a).
In the figure, 21 is a cable core vacuum layer, 22 is a cable core conductor layer, 23 is an inner insulating layer, 24 is a conductive layer, and 25 is an outer insulating layer.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
Example 1
Referring to fig. 1, the electromagnetic transient simulation experiment platform of the constant-voltage submarine observation network power supply system of the cable system of the embodiment is 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 electromagnetic transient simulation experiment platform comprises: the power transmission and distribution model is formed by connecting a main photoelectric composite submarine cable equivalent model, a branch unit model, a branch photoelectric composite submarine cable equivalent model, a seabed connection box power model and a load model in sequence, and 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 model comprises three transmission and distribution models, namely a first transmission and distribution model, a second transmission and distribution model and a third transmission and distribution model, wherein a trunk photoelectric composite submarine cable equivalent model of the first transmission and distribution model is connected to an output interface of the shore base station power model, and the second transmission and distribution model and the third transmission and distribution model share the same topological structure formed by sequentially connecting the trunk photoelectric composite submarine cable equivalent model and a branch unit model; and a 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 a land commercial power, 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 transformation 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 commercial power; the input protection circuit judges whether overvoltage or undervoltage phenomenon 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 a land commercial power into required high-voltage direct current electric 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 phenomenon 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 converter transformer delta/Yn wiring, and the output side adopts a single-pole negative-polarity power transmission mode; the structure accords with the power transmission and distribution mode of the observation network power supply practical engineering. A full-bridge modular multilevel converter in a shore base station power model adopts a direct current control strategy. The full-bridge modular multilevel converter has the advantages of low requirement on dynamic voltage equalization triggered by devices in a consistent manner, 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 main 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 insulating layer 23, a conductive layer 24 and an outer insulating layer 25 from inside to outside, wherein the radiuses of the cable core vacuum layer 21, the cable core conductor layer 22, the inner insulating layer 23, the conductive layer 24 and the outer insulating layer 25 are R _ cv, R _ cc, R _ ii, R _ c and R _ io respectively, the resistivities of the cable core conductor layer 22 and the conductive layer 24 are R _ cc and R _ c respectively, the relative conductivities of the cable core conductor layer 22, the inner insulating layer 23, the conductive layer 24 and the outer insulating layer 25 are p _ cc, p _ ii, p _ c and p _ io respectively, and the photoelectric composite submarine cable equivalent model is used for simulating the electric quantity operation condition of the photoelectric composite submarine cable.
The equivalent model of the main photoelectric composite submarine cable between the shore base station electric power model and the branch unit model is a photoelectric composite submarine cable-main cable, and the equivalent model of the branch photoelectric composite submarine cable between the branch unit model and the submarine junction box electric power model is a photoelectric composite submarine cable-branch cable. The lengths of all the photoelectric composite submarine cables and main cables are the same and are L _ Bb; the lengths of all the photoelectric composite submarine cables and branch cables are the same and are L _ Spur.
Referring to fig. 5, the branch unit model includes 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 prn.1, the second relay switch prn.2, the third relay switch prn.3, and the fourth relay switch prn.4, the first control unit is connected with the first power taking unit, the first power taking unit is connected with the first measuring unit, the second control unit is connected with the second power taking unit, the second power taking unit is connected with the second measuring unit, the first measuring unit and the second measuring unit are connected through the first relay switch prn.1 and the second relay switch prn.2 arranged in parallel, a left branch is led out between the first relay switch prn.1 and the second relay switch prn.2 arranged in parallel, the third measuring unit and the third relay switch prn.3 are connected to the left branch in sequence, a right branch is led out between the second measuring unit and a first relay switch PRn.1 and a second relay switch PRn.2 which are arranged in parallel, and a fourth measuring unit and a fourth relay switch PRn.4 times are connected to the right branch; the first power taking unit is connected to a trunk photoelectric composite submarine 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 submarine cable equivalent model of the same power transmission and distribution model, and the second power taking unit is connected to a trunk photoelectric composite submarine cable equivalent model of the other power transmission and distribution model.
The contact points B of the first relay switch PR n.1 and the second relay switch PR n.2 are connected with the contact point A of the third relay switch PR n.3, the contact points A of the first relay switch PR n.1 and the second relay switch PR n.2 are connected with the contact point A of the fourth relay switch PR n.4, and the contact point B of the third relay switch PR n.3 is connected with the contact point B of the fourth relay switch PR n.4.
The first power taking unit is used for supplying power to the first control unit, the second power taking unit is used for supplying power to the second control unit, and each control unit is used for connecting or disconnecting a trunk photoelectric composite submarine cable equivalent model or a branch photoelectric composite submarine cable equivalent model connected with each branch unit model by controlling the on/off of each relay switch through a program, so that the submarine observation network topology structure can be changed, and a fault branch can be cut off when a line has a fault.
The first control unit controls the on and off of a first relay switch PRn.1, a second relay switch PRn.2 and a third relay switch PRn.3, the second control unit controls the on and off of the first relay switch PRn.1, the second relay switch PRn.2 and a fourth relay switch PRn.4, for example, a left fault, the first control unit controls the on and off of the first relay switch PRn.1, the second relay switch PRn.2 and the third relay switch PRn.3, and the right branch cable runs; when the right side has a 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 side is connected with a branch cable to operate; when the branch cable fails, the first control unit controls the third relay switch PRn.3 to be switched off, and the second control unit controls the fourth relay switch PRn.4 to be switched off.
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 in a disconnected state before being started.
Referring to fig. 6, each of the first power taking unit and the second power taking unit includes two sets of anti-parallel diodes and a bridge rectifier circuit, one set of anti-parallel diodes is connected in reverse series with the other set of anti-parallel diodes, one input end of the bridge rectifier circuit is connected to one end of one set of anti-parallel diodes, and the other input end of the bridge rectifier circuit is connected to one end of the other set 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 junction 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 phenomenon 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 the module stack; the output protection circuit judges whether overvoltage or undervoltage phenomenon exists or not through the voltage value detected by the output voltage and current detection circuit.
The rated capacity of the synchronous rectification converter based on the module stack is S _ src; referring to fig. 8, the synchronous rectification converter based on module stacking is formed by stacking N low-voltage low-power DC/DC isolation conversion modules in a manner of series input stage and parallel output stage, and the N low-voltage low-power DC/DC isolation conversion modules share one 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 in parallel at the output end, and shares the same output filter circuit. A synchronous rectification converter based on module stacking is adopted in the seabed connection box power model, a synchronous PWM signal is provided based on peak current control, and each low-voltage low-power double-tube forward converter is driven by the synchronous signal to realize natural current equalizing and voltage equalizing.
A synchronous rectifier converter based on module stacking in a submarine junction box power model adopts a single control strategy based on peak current control.
The load model is a constant impedance model and is used for simulating the submarine power load represented by a submarine scientific observation instrument.
The voltage detection and the current detection in 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 measurement unit of the branch unit respectively adopt a Hall voltage sensor and a Hall current sensor.
Example 2
Referring to fig. 9, the electromagnetic transient simulation experimental platform of the constant-voltage submarine observation network power supply system of the cable system of the present embodiment is a two-end ring two-node topology structure, and the difference from embodiment 1 is only: 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 respectively a first shore base station power model and a second shore base station power model, the power transmission and distribution models are two, respectively a first power transmission and distribution model and a second power transmission and distribution model, a trunk photoelectric composite submarine 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 trunk photoelectric composite submarine 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, 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 trunk photoelectric composite submarine cable equivalent model. The rest is the same as example 1.
Example 3
Referring to fig. 10, the electromagnetic transient simulation experimental platform of the constant-voltage submarine observation network power supply system of the cable system of the present embodiment is a double-end ring three-node topology, and the difference from embodiment 1 is only: 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 respectively a first shore base station power model and a second shore base station power model, the transmission and distribution model is four, the transmission and distribution model is respectively a first transmission and distribution model, a second transmission and distribution model, a third transmission and distribution model and a fourth transmission and distribution model, a trunk photoelectric composite submarine cable equivalent model of the first transmission and distribution model is connected to an output interface of the first shore base station power model, a trunk photoelectric composite submarine cable equivalent model of the second transmission and distribution model is connected to an output interface of the second shore base station power model, the third transmission and distribution model and the fourth transmission and distribution model share the same topological structure formed by sequentially connecting a branch unit model, a branch photoelectric composite submarine cable equivalent model, a submarine junction box power model and a load model, the shared branch unit models are respectively connected to trunk photoelectric composite submarine cable equivalent models of the third transmission and distribution model and the fourth transmission and distribution model, the trunk photoelectric composite submarine cable equivalent model of the third power transmission and distribution model is connected to the branch unit model of the first power transmission and distribution model, and the trunk photoelectric composite submarine cable equivalent model of the fourth power transmission and distribution model is connected to the branch unit model of the second power transmission and distribution model. The rest is the same as example 1.
The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system in the embodiment 3 is used for carrying out experiments, and 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 in the embodiment 3. Adjusting specific parameters of a shore base station power model, a main photoelectric composite submarine cable equivalent model, a branch photoelectric composite submarine cable equivalent model, a seabed connection box power model and a load model to achieve the aim of' shore base station power model transmissionThe output voltage and the output current respectively reach rated values UR、IRAnd the output current fluctuation rate is less than 3%, and the output voltage fluctuation rate is less than 5% ".
The simulation experiment platform is set up in PSCAD/EMTDC software, and simulation experiment recording is given to verify the correctness of the simulation experiment platform disclosed by the invention.
An electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system in embodiment 3 of the invention is built on PSCAD/EMTDC software, wherein key parameters of the submarine observation network power supply system and frequency-dependent parameter model parameters of the photoelectric composite submarine cable equivalent model are respectively shown in tables 1 and 2.
TABLE 1 Critical parameters of power supply system of submarine observation network
TABLE 2 frequency-dependent parameter model parameters of photoelectric composite submarine cable equivalent model
| Parameter(s) | (symbol) | Numerical value | |
| Radius of cable core vacuum layer | r_cv | 1.145mm | |
| Radius of conductor layer of cable core | r_cc | 2.560mm | |
| Radius of inner insulation 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-5Ω·mm | |
| Resistivity of conductive layer | R_c | 2.2e-4Ω·mm | |
| Relative magnetic permeability of conductor layer of cable core | p_cc | 9.0788 | |
| Relative permeability of inner insulating | p_ii | 1 | |
| Relative permeability of | p_c | 1 | |
| Relative permeability of outer insulating | p_io | 1 |
The experimental recordings are simulated on PSCAD/EMTDC as shown in FIGS. 11-14, where the simulation step size is 25 us. According to the invention, the shore base station power model output voltage U is selected from 10s to 12s after the start of simulation as a schematic diagram time intervaldcOutput current IdcIs shown in fig. 11; measuring unit measuring voltage U of branch unit modelBR、UBI、USPAs shown in FIG. 12, the measurement unit of the branch unit model measures the current IBR、IBI、ISPIs shown in fig. 13, wherein the first measuring unit measures the electrical quantity UBR、IBRThe second measuring unit measures the electrical quantity UBI、IBIThe third measuring unit and the fourth measuring unit measure the electric quantity USP、ISP(ii) a Seabed connection box power model input voltage U of first power transmission and distribution modelJBOutput voltage UJB-OIs shown in fig. 14.
The invention discloses a simulation experiment platform of a power supply system of a cable system constant-voltage submarine observation network, 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 grounded by adopting a converter transformer delta/Yn connection mode, and the output side adopts a single-pole negative-polarity power transmission mode. In the aspect of control strategies, a direct current control strategy is adopted by a full-bridge modular multilevel converter in a shore-based station power model, a single control strategy based on peak current control is adopted by a synchronous rectification converter based on module stacking in a seabed junction box power model, and the two strategies are mutually cooperated.
The shore base station power model and the seabed connection box power model of the simulation experiment platform have detailed internal current conversion modules, the control strategy is clear, the branch unit adopts a novel power electronic topological structure, the photoelectric composite submarine cable equivalent model is accurate, and the power transmission and distribution mode conforms to the actual engineering condition of seabed power supply; the method can accurately and reliably simulate the normal operation state and the electromagnetic transient process of the cable system constant-voltage submarine observation network power supply system during fault, thereby laying a good foundation for the safety and stability analysis, the protection strategy and the study of the 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 they are also within the scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (10)
1. The utility model provides a cable system constant voltage seabed observation network power supply system electromagnetism transient state simulation experiment platform, includes bank base station electric power model and power transmission and distribution model, and bank base 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 submarine cable equivalent model, a branch unit model, a branch photoelectric composite submarine cable equivalent model, a seabed 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 any one of the following modes;
the first mode is as follows: the shore base station power model comprises three transmission and distribution models, namely a first transmission and distribution model, a second transmission and distribution model and a third transmission and distribution model, wherein a trunk photoelectric composite submarine cable equivalent model of the first transmission and distribution model is connected to an output interface of the shore base station power model, and the second transmission and distribution model and the third transmission and distribution model share the same topological structure formed by sequentially connecting the trunk photoelectric composite submarine cable equivalent model and a branch unit model; a 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;
the second mode is as follows: the shore base station power models comprise a first shore base station power model and a second shore base station power model, the transmission and distribution models comprise two, namely a first transmission and distribution model and a second transmission and distribution model, a trunk photoelectric composite submarine cable equivalent model of the first transmission and distribution model is connected to an output interface of the first shore base station power model, a trunk photoelectric composite submarine cable equivalent model of the second transmission and distribution model is connected to an output interface of the second shore base station power model, and a branch unit model of the first transmission and distribution model is connected with a branch unit model of the second transmission and distribution model through the trunk photoelectric composite submarine cable equivalent model;
the third mode is as follows: the shore base station power models are respectively a first shore base station power model and a second shore base station power model, the transmission and distribution model is four, the transmission and distribution model is respectively a first transmission and distribution model, a second transmission and distribution model, a third transmission and distribution model and a fourth transmission and distribution model, a trunk photoelectric composite submarine cable equivalent model of the first transmission and distribution model is connected to an output interface of the first shore base station power model, a trunk photoelectric composite submarine cable equivalent model of the second transmission and distribution model is connected to an output interface of the second shore base station power model, the third transmission and distribution model and the fourth transmission and distribution model share the same topological structure formed by sequentially connecting a branch unit model, a branch photoelectric composite submarine cable equivalent model, a submarine junction box power model and a load model, the shared branch unit models are respectively connected to trunk photoelectric composite submarine cable equivalent models of the third transmission and distribution model and the fourth transmission and distribution model, the trunk photoelectric composite submarine cable equivalent model of the third power transmission and distribution model is connected to the branch unit model of the first power transmission and distribution model, and the trunk photoelectric composite submarine cable equivalent model of the fourth power transmission and distribution model is connected to the branch unit model of the second power transmission and distribution model.
2. The electromagnetic transient simulation experiment platform for the cable system constant-voltage submarine observation network power supply system according to claim 1, characterized in that: 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 commercial power; 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 commercial power; the input protection circuit judges whether overvoltage or undervoltage phenomena exist or not according to 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 a land commercial power 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 phenomena exist or not through the voltage value detected by the output voltage and current detection circuit.
3. The electromagnetic transient simulation experiment platform for the cable system constant-voltage submarine observation network power supply system according to claim 1 or 2, wherein: the shore base station power model grounding mode adopts converter transformer delta/Yn wiring, and the output side adopts a single-pole negative-polarity power transmission mode.
4. The electromagnetic transient simulation experiment platform for the cable system constant-voltage submarine observation network power supply system according to claim 1 or 2, wherein: 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 conducting layer and an outer insulating layer from inside to outside.
5. The electromagnetic transient simulation experiment platform for the cable system constant-voltage submarine observation network power supply system according to claim 1 or 2, wherein: 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, a fourth measuring unit, a first relay switch, a second relay switch, a third relay switch and a fourth relay switch; the first control unit is connected with the first power taking unit, the first power taking unit is connected with the first measuring unit, the second control unit is connected with the second power taking unit, the second power 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, the third measuring unit and the third relay switch are sequentially connected onto 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 the fourth measuring unit and the fourth relay switch are connected onto the right branch in turn; the first power taking unit is connected to a trunk photoelectric composite submarine 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 submarine cable equivalent model of the same power transmission and distribution model, and the second power taking unit is connected to a trunk photoelectric composite submarine cable equivalent model of the other power transmission and distribution model.
6. The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system according to claim 5, characterized in that: 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.
7. The electromagnetic transient simulation experiment platform of the cable system constant-voltage submarine observation network power supply system according to claim 5, characterized in that: the first power taking unit and the second power taking unit respectively comprise two groups of anti-parallel diodes and a bridge rectifier circuit, wherein one group of anti-parallel diodes is reversely connected with the other group of anti-parallel diodes in series, 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 of the bridge rectifier circuit 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, and the filter circuit is connected with the output end of the bridge rectifier circuit.
8. The electromagnetic transient simulation experiment platform for the cable system constant-voltage submarine observation network power supply system according to claim 1 or 2, wherein: the seabed junction 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 the input voltage and current of the synchronous rectification converter based on module stacking; the input protection circuit judges whether overvoltage or undervoltage phenomena exist or not according to 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 phenomena exist or not through the voltage value detected by the output voltage and current detection circuit.
9. The electromagnetic transient simulation experiment platform for the cable system constant-voltage submarine observation network power supply system according to claim 8, wherein: 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 of serially connecting input stages and parallelly connecting output stages, and the N low-voltage low-power DC/DC isolation conversion modules share one input filter circuit.
10. The electromagnetic transient simulation experiment platform for the cable system constant-voltage submarine observation network power supply system according to claim 8, wherein: the module stack based synchronous rectifier converter adopts a single control strategy based on peak current control.
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