CN112557704A - Alternating current-direct current series-parallel connection power distribution network frame capable of being flexibly configured and true type test system - Google Patents
Alternating current-direct current series-parallel connection power distribution network frame capable of being flexibly configured and true type test system Download PDFInfo
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Abstract
The invention discloses an alternating current-direct current hybrid power distribution network frame capable of being flexibly configured and a true type test system, wherein the alternating current-direct current hybrid power distribution network frame comprises an alternating current power distribution network frame, a direct current power distribution network frame and an alternating current-direct current network frame flexible configuration control system; the direct current distribution network frame comprises a medium-voltage direct current bus and a low-voltage direct current bus; the medium-voltage alternating current bus, the low-voltage alternating current bus, the medium-voltage direct current bus and the low-voltage direct current bus are connected in an alternating current-direct current hybrid mode; the flexible configuration control system of alternating current-direct current includes: the system comprises a medium-low voltage alternating current and direct current comprehensive monitoring system, a data transmission device, a ring main unit, a switch cabinet, a configuration cabinet and a valve control cabinet. The invention provides an alternating current-direct current hybrid power distribution network frame capable of being flexibly configured, which is used for a true type test; based on the true test system of the alternating current-direct current hybrid power distribution network with different voltage grades, seamless connection from equipment test debugging to actual application in a production field can be realized, and full-function test research projects of various alternating current-direct current power distribution networks can be developed.
Description
Technical Field
The invention belongs to the technical field of alternating current and direct current hybrid power distribution networks and true type test systems, and particularly relates to an alternating current and direct current hybrid power distribution network frame capable of being flexibly configured and a true type test system.
Background
In recent years, the technology of power distribution networks is developed vigorously, and the new equipment of the current new technology is endlessly developed, so that the power distribution networks face a series of challenges:
(1) the form of the power distribution network is rapidly evolving; the traditional radiation type power distribution network is being developed into a multi-stage and multi-state complex power distribution network, the requirement on the reliability of power supply of users is continuously improved, the requirement on the quality of multi-load electric energy is more and more urgent, and higher requirements on the safety, the economy and the adaptability of the power distribution network are provided; distributed energy, electric vehicles and multi-load represented by stored energy are quickly connected to the grid in a large scale, and the intelligent interaction requirements of a power grid and users gradually appear.
(2) New technical equipment of the power distribution network continuously emerges; the power electronic technology is rapidly developed, the fusion of a physical system and an information system of a power distribution network is increasingly deepened, and the fusion application pace of a cloud mobility intelligent technology and the power distribution network is gradually accelerated; novel distribution network equipment such as intelligent switches, novel environment-friendly equipment and power electronic equipment are gradually applied in a large scale, but a systematic testing and evaluating method is still in short position.
(3) The problem of 'old and difficult' of the power distribution network is still outstanding; an effective ground fault studying and judging system is still lacked, and effective test verification is lacked in ground fault line selection and positioning processing methods under the coordination of various neutral point grounding modes and a power distribution automation technology; the traditional problems that the power supply reliability and the personal safety are seriously threatened by typhoon and lightning stroke are still outstanding, and a reliable and effective operation verification method is also lacked in technical measures.
The existing power grid test research means has great defects:
(1) in the application of dynamic simulation tests to power systems, an analog simulator is expensive, running cost is high, and a long time is often spent on researching a research project, so that test scale is limited, and test precision is often low due to subjective errors of operators, so that the dynamic simulation tests are not favored in the current world.
(2) In the application of the digital simulation modeling in the power system, the non-real-time simulation speed of the digital simulation modeling cannot meet the requirement of a real-time interactive test with external physical control equipment and a protection device, so the digital simulation physical modeling for the power system has higher difficulty and large limitation on grid-connected operation.
In summary, a new flexibly configurable ac/dc hybrid distribution network frame and a true test system are needed.
Disclosure of Invention
The invention aims to provide an alternating current-direct current hybrid power distribution network frame capable of being flexibly configured and a true test system, so as to solve one or more technical problems. The invention provides an alternating current-direct current hybrid power distribution network frame capable of being flexibly configured, which is used for a true type test; based on the true test system of the alternating current-direct current hybrid power distribution network with different voltage grades, seamless connection from equipment test debugging to actual application in a production field can be realized, and full-function test research projects of various alternating current-direct current power distribution networks can be developed.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses an alternating current-direct current hybrid power distribution network frame capable of being flexibly configured, which is used for a true type test and comprises the following components: the system comprises an alternating current power distribution net rack, a direct current power distribution net rack and an alternating current and direct current net rack flexible configuration control system;
the alternating current distribution network frame comprises a medium-voltage alternating current bus and a low-voltage alternating current bus; the direct-current power distribution network frame comprises a medium-voltage direct-current bus and a low-voltage direct-current bus; the medium-voltage alternating current bus, the low-voltage alternating current bus, the medium-voltage direct current bus and the low-voltage direct current bus are connected in an alternating current-direct current hybrid mode;
the alternating current-direct current flexible configuration control system comprises: the system comprises a medium-low voltage alternating current and direct current comprehensive monitoring system, a data transmission device, a ring main unit, a switch cabinet, a configuration cabinet and a valve control cabinet; the medium-low voltage alternating current and direct current comprehensive monitoring system comprises a medium-voltage alternating current distribution monitoring system, a low-voltage alternating current distribution monitoring system, a medium-voltage direct current distribution monitoring system and a low-voltage direct current distribution monitoring system, is used as a man-machine interface device for running and debugging of a medium-low voltage alternating current and direct current distribution network system, and has the functions of remote control and local control of the system, monitoring of the running state of the system and recording and displaying of event information; the looped netowrk cabinet disposes in the cable run of interchange distribution rack and direct current distribution rack, includes: a traditional ring main unit and an intelligent ring main unit; the traditional ring main unit is provided with a centralized data transmission device, the intelligent ring main unit is a secondary fusion ring main unit, and the intelligent ring main unit is provided with a distributed data transmission device; the cubical switchboard is disposed in the overhead line of AC distribution rack and DC distribution rack, includes: a section switch and a tie switch; the section switch and the interconnection switch are both primary and secondary fusion intelligent switches; the configuration cabinet is used for realizing the unified remote control of each device by the central controller and has the function of automatically switching the experimental topological structure; the valve control case is used for coordinating and controlling the bridge arm, receiving and executing the issued control instruction, and uploading the running state information, the alarm information and the trip information of the valve control system.
The invention is further improved in that the medium-voltage alternating-current bus, the low-voltage alternating-current bus, the medium-voltage direct-current bus and the low-voltage direct-current bus realize alternating-current and direct-current series-parallel connection through a modular multilevel converter topological structure, a bidirectional active bridge, a bidirectional isolation type direct-current and alternating-current inverter, a voltage source type converter and a distribution transformer.
The invention has the further improvement that the medium-voltage alternating current bus and the medium-voltage direct current bus are connected through a cascade H-bridge type MMC current converter; the medium-voltage alternating-current bus and the medium-voltage direct-current bus are connected through the VSC;
the low-voltage alternating current bus is respectively connected with the direct current output port of the MMC converter station through a bidirectional isolation type DC/AC inverter to form a low-voltage interconnection alternating current bus; the low-voltage direct current bus is respectively connected with a medium-voltage direct current output port of a cascade H bridge in the MMC converter station through DAB to form a low-voltage connection direct current bus;
the primary side of the distribution transformer is connected with a medium-voltage alternating-current bus, and the secondary side of the distribution transformer is connected with a low-voltage alternating-current bus.
The invention is further improved in that the voltage grade of the medium-voltage alternating-current bus is 10kV, the voltage grade of the low-voltage alternating-current bus is 380V, the voltage grade of the medium-voltage direct-current bus is +/-20 kV, and the voltage grade of the low-voltage direct-current bus is +/-750V.
The invention has the further improvement that the medium and low voltage alternating current and direct current integrated monitoring system adopts IEC 61850 standard communication.
The invention relates to a true model test system, which comprises: the device comprises a medium-voltage alternating current true test system, a low-voltage alternating current true test system, a medium-voltage direct current true test system and a low-voltage direct current true test system;
the medium-voltage alternating current true test system, the low-voltage alternating current true test system, the medium-voltage direct current true test system and the low-voltage direct current true test system are all built based on the flexibly configurable alternating current-direct current hybrid power distribution network frame;
the medium-voltage alternating-current true test system and the low-voltage alternating-current true test system are used for providing a true test scene of a typical grid structure and an operation mode of the alternating-current power distribution network in a mode of flexible switch configuration presetting; the system is used for developing one or more tests of primary and secondary fusion equipment, single-phase earth fault line selection and section selection, power distribution automation system and power distribution terminal function tests, distribution network relay protection operation tests, neutral point equipment function verification tests, intelligent power distribution equipment inspection and power distribution network lightning protection;
the medium-voltage direct-current true test system and the low-voltage direct-current true test system are used for establishing a typical topological structure of flexible direct-current transmission and distribution demonstration engineering through flexible configuration of a direct-current bus distribution device and researching the operation characteristics and performance indexes of a direct-current distribution network in different application scenes.
In a further development of the invention, the medium voltage ac true test system comprises: the system comprises an isolation transformer, a ring main unit, a switch cabinet and neutral point equipment; the isolation transformer is used for being connected between a power grid 10kV incoming line and a medium-voltage alternating-current bus; the ring main unit is used for connecting different medium-voltage alternating-current buses and isolation transformers; the neutral point equipment is connected with the medium voltage alternating current bus through a switch cabinet.
In a further development of the invention, the low voltage ac true test system comprises: the system comprises a distribution transformer, a low-voltage incoming and outgoing line switch cabinet, a hybrid energy storage device, an intelligent capacitor bank, an intelligent phase-change switch system, a static reactive power compensation generator, a wind generating set, a photovoltaic power generation device and a programmable alternating current PLC analog load; the distribution transformer is connected between the medium-voltage alternating-current bus and the low-voltage alternating-current bus, and other equipment or devices are connected to the low-voltage alternating-current bus.
In a further improvement of the present invention, the medium voltage dc true test system comprises: the system comprises an MMC converter, a starting cabinet, a bridge arm reactor and a bridge arm current sensor; the front end AC end of the MMC converter is connected with a medium-voltage alternating current bus, and the DC end of the MMC converter is connected with a medium-voltage direct current bus; and the bridge arm reactors and the bridge arm current sensors are connected to the bridge arms of the MMC current converter.
In a further improvement of the present invention, the low voltage dc true test system comprises: the system comprises a direct current ring network system, a hybrid energy storage device, a wind generating set, a photovoltaic power generation device and a programmable direct current PLC analog load; the direct current ring network system is formed by connecting a medium-voltage direct current bus and a low-voltage direct current bus to form a ring network through DAB; the rest of the equipment or devices are connected to the low-voltage direct-current bus.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a real physical environment, an operation environment and various real faults of the power distribution network can be approached to the maximum extent by constructing and restoring a real alternating current-direct current hybrid regional power distribution network; the comprehensive research and panoramic test verification can be carried out on the aspects of distribution network primary equipment, secondary equipment, intelligent operation and inspection equipment, distribution internet of things and the like, the whole system can completely reproduce the actual working conditions, has full-voltage and full-current power level test capability, and covers a complete 'station line to user' distribution network system, wherein 'station' refers to a transformer substation; "line" refers to a transmission line; "variable" refers to a transformer; "user" means a user.
The multi-voltage-level alternating current and direct current hybrid network frame built based on the MMC converter station and the bidirectional active bridge DAB can facilitate the access of different types of distributed energy, alternating current and direct current loads, hybrid energy storage and the like to a regional power distribution network, and can effectively meet increasingly complex environmental transformation of the power distribution network.
Compared with the network hanging test, the power distribution network true test system provided by the invention has the advantages that a true test field can reappear a large number of true operation and fault scenes in a short time, and complete test phenomena and data are recorded; finally, seamless connection from equipment test debugging to actual application in a production field can be realized, and full-function test research projects of various alternating current and direct current power distribution networks can be developed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of an ac/dc hybrid power distribution grid structure capable of being flexibly configured according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a topological structure of an MMC converter station in the embodiment of the present invention;
fig. 3 is a schematic diagram of the topology of the cascaded H-bridge and DAB in the embodiment of the present invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides an ac/dc hybrid distribution network frame capable of multi-state reconstruction, including an ac distribution network, a dc distribution network, and an ac/dc flexible configuration control system; the alternating current distribution network comprises a medium-voltage alternating current bus (10kV) and a low-voltage alternating current bus (380V); the direct current distribution network comprises a medium-voltage direct current bus (+ -20 kV) and a low-voltage direct current bus (+ -750V);
as shown in fig. 1, the medium voltage ac bus and the medium voltage dc bus are connected by a cascaded H-bridge MMC converter, and the medium voltage ac bus and the medium voltage dc bus are also connected by a VSC; the low-voltage alternating current bus is respectively connected with the direct current output port of the MMC converter station through a bidirectional isolation type DC/AC inverter to form a low-voltage interconnection alternating current bus; the low-voltage direct current bus is respectively connected with a medium-voltage direct current output port of a cascade H bridge in the MMC converter station through DAB to form a low-voltage connection direct current bus; the primary side of the distribution transformer is connected with a medium-voltage alternating-current bus, and the secondary side of the distribution transformer is connected with a low-voltage alternating-current bus.
The AC/DC flexible configuration control system adopts IEC 61850 standard communication to complete data interaction of monitoring, control and communication management between the medium and low voltage AC/DC power distribution systems; the communication manager adopts IEC 104 standard to complete interaction with the medium-voltage alternating-current true test system, the low-voltage alternating-current true test system, the medium-voltage direct-current true test system and the low-voltage direct-current true test system, and monitoring and control of the subsystem are realized; the electric energy parameter acquisition module, the remote control electric operator, the contactor, the configuration cabinet and the remote control device are used for realizing the unified remote control of each device by the central controller, realizing the storage, analysis and advanced application development of the state monitoring data information of each real test system functional module, and realizing the configuration setting and remote control of the grid structure and the running state of the real test system.
In the embodiment of the invention, the comprehensive monitoring system completes the data interaction of monitoring, control and communication management of a medium-voltage alternating-current power distribution system; the communication manager adopts IEC 104 or IEC 61850 standard to complete interaction with the low-voltage alternating current power distribution system, the medium-voltage direct current power distribution system and the low-voltage direct current power distribution system, and monitoring and control of the subsystem are realized. The configuration cabinet is used for realizing the unified remote control of each device by the central controller and realizing the function of automatically switching the experimental topological structure; the configured configuration type quick plugging port is used for accessing equipment such as various types of distributed power generation sources, energy storage systems and various types of analog loads, and wiring is in a downward wire inlet and downward wire outlet mode; and meanwhile, a remote control electric operator, a contactor, an electric energy parameter acquisition module and the like are arranged, so that remote operation can be realized. The valve control case is a core control unit of the valve control system and is responsible for coordination control of the bridge arm, receiving and executing the issued control instruction and uploading the running state information, alarm and trip information of the valve control system; and the data interaction between the upper control unit and the upper control unit is completed, and the interface and the control between the lower control unit and the sub-module are completed.
As shown in fig. 2 and 3, the cascaded H-bridge MMC current converter is formed by cascading a multi-unit H-bridge converter on the medium-voltage AC side of each phase to convert medium-voltage AC into medium-voltage DC, and an intermediate isolation DC-DC conversion link is implemented by using a bidirectional active bridge (DAB) to convert medium-voltage DC into low-voltage DC, and the H-bridge unit and the DAB link are connected by a medium-voltage DC bus capacitor to form a power module of the cascaded H-bridge MMC, and each MMC power module is connected in parallel on the output side to form a low-voltage DC port, and finally, the bidirectional isolation DC/AC inverter is used to convert low-voltage DC into low-voltage AC.
The AC/DC hybrid net rack provided by the invention can facilitate the access of different types of distributed energy, AC/DC loads, hybrid energy storage and the like to a regional power distribution network, and can effectively meet increasingly complex environmental transformation of the power distribution network; the power distribution network true test system avoids errors caused by model design and parameter setting of a traditional test method, and approaches to a real field environment to the maximum extent; meanwhile, compared with the on-line test, the true test field can reproduce a large number of true operation and fault scenes in a short time and record complete test phenomena and data; finally, seamless connection from equipment test debugging to actual application in a production field can be realized, and full-function test research projects of various alternating current and direct current power distribution networks can be developed.
Based on the network frame, the embodiment of the invention also provides a power distribution network true type test system which comprises a power supply and neutral point system, a medium-voltage alternating current true type test system, a low-voltage alternating current true type test system, a medium-voltage direct current true type test system and a low-voltage direct current true type test system.
In the embodiment of the invention, the neutral point system mainly comprises an isolation transformer, an arc suppression coil complete system and a small resistor complete system; according to the simulation grounding mode listed by meeting the main wiring, a single-pole vacuum contactor is configured as a switching element, so that the flexible control of the grounding mode is realized, and the specific realization process is as follows: the method is characterized in that the method comprises the steps of leading in a grounding transformer from a 10kV bus, leading out the grounding transformer in a ZN mode, leading out a neutral point to a public bus control cabinet, wherein the neutral point grounding mode comprises 5 optional modes and reserving 2 spare intervals. Each grounding form is accessed to a common bus through a vacuum contactor, and the switching on and off of the load mode can be flexibly realized through remotely or locally controlling the vacuum contactor according to the grounding mode simulated by the experimental needs; the neutral point grounding mode includes "no grounding", "grounding via the arc suppression coil", "grounding via the small resistor", "grounding via the arc suppression coil and the medium and small resistors".
The medium-voltage alternating-current true test system comprises an isolation transformer, a ring main unit, a reactor, a switch cabinet and neutral point equipment; the method provides true test scenes of typical grid structures and operation modes of the alternating-current power distribution network in a mode of flexible switch configuration presetting, and test items such as primary and secondary fusion equipment, single-phase earth fault line selection and section selection, power distribution automation system and power distribution terminal function tests, distribution network relay protection operation tests, neutral point equipment function verification tests, intelligent power distribution equipment inspection, power distribution network lightning protection and the like are developed.
The low-voltage alternating current true type test system comprises a distribution transformer, a low-voltage incoming and outgoing line switch cabinet, a hybrid energy storage device, an intelligent capacitor bank, an intelligent phase-change switch system, a static reactive compensation generator, a wind generating set, a photovoltaic generating device and a programmable alternating current PLC analog load; the system is built based on a flexibly configured low-voltage distribution network, a low-voltage full-line running state simulation test of a transformer substation, a branch box, a user meter box and a user is designed, and test researches such as low-voltage topology identification, low-voltage fault study and judgment, line impedance calculation and analysis and the like are carried out on the basis; meanwhile, the test research on the aspects of reactive compensation, low/high voltage control and three-phase imbalance regulation of the transformer area and the validity test verification of the electric energy quality treatment equipment are carried out.
The medium-voltage direct-current true test system comprises a 10kV incoming line switch cabinet, an MMC converter, a starting cabinet, a direct-current interface cabinet, a bridge arm reactor and a bridge arm current sensor; by developing a true test of a topological structure and an operation mode of the direct current distribution system, the electrical stress characteristic of primary equipment of the direct current distribution system under different topological combinations and different operation working conditions and the fault protection, isolation and quick recovery technology of an alternating current and direct current hybrid system are fully researched, the performance index requirement is provided, the technical standards of product testing, operation and operation maintenance are formulated, and the compatibility and reliability of the direct current distribution technology and the alternating current distribution technology are improved.
The low-voltage direct current true type test system comprises a direct current ring network system, a high-low valve group series system, a hybrid energy storage device, a wind generating set, a photovoltaic power generation device and a programmable direct current PLC analog load; by means of the system platform, test research contents such as intelligent distribution area situation perception technology verification, intelligent distribution area low-voltage distribution automation technology verification, household photovoltaic island protection and monitoring technology verification, low-voltage distribution area autonomous power supply technology verification, intelligent distribution area loss statistical analysis method research and technology verification can be developed.
The medium-voltage flexible direct four-terminal test system is complete in function, flexible and various in operation mode, and capable of achieving operation modes including four-terminal direct current ring network operation, two-terminal symmetrical double poles, high-low valve group series operation and the like. And a typical direct current distribution network topological structure can be formed, and the running characteristics, performance indexes and the like of the direct current distribution network under different application scenes are researched.
In summary, the invention discloses an alternating current and direct current hybrid power distribution network frame capable of being flexibly configured and a true type test system, wherein the true type test system comprises an alternating current power distribution network, a direct current power distribution network, an alternating current and direct current flexible configuration control system and a power distribution network true type test system; the alternating current-direct current flexible configuration control system can realize configuration setting and remote control of the grid structure and the running state of the true test system through a configuration cabinet, a telecontrol device and the like; the multi-state reconstruction of the AC/DC hybrid net rack is realized by cascading an H-bridge type MMC converter, a bidirectional active bridge, a bidirectional isolation type inverter and the like, and a complete station line-to-user distribution network system is covered; by building a real medium-low voltage AC/DC power distribution network true test scene, full-function test research projects of various AC/DC power distribution networks can be developed, so that rapid iteration and practical application of advanced technologies of the power distribution networks are promoted, seamless connection of new equipment from comprehensive verification and evaluation to production application is realized, and construction and development of a new generation intelligent power distribution network with safety, reliability, high quality, high efficiency, greenness, low carbon and intelligent interaction are vigorously supported.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (10)
1. The utility model provides an alternating current-direct current series-parallel connection distribution rack that can nimble configuration for true type is experimental, its characterized in that includes: the system comprises an alternating current power distribution net rack, a direct current power distribution net rack and an alternating current and direct current net rack flexible configuration control system;
the alternating current distribution network frame comprises a medium-voltage alternating current bus and a low-voltage alternating current bus; the direct-current power distribution network frame comprises a medium-voltage direct-current bus and a low-voltage direct-current bus; the medium-voltage alternating current bus, the low-voltage alternating current bus, the medium-voltage direct current bus and the low-voltage direct current bus are connected in an alternating current-direct current hybrid mode;
the alternating current-direct current flexible configuration control system comprises: the system comprises a medium-low voltage alternating current and direct current comprehensive monitoring system, a data transmission device, a ring main unit, a switch cabinet, a configuration cabinet and a valve control cabinet; the medium-low voltage alternating current and direct current comprehensive monitoring system comprises a medium-voltage alternating current distribution monitoring system, a low-voltage alternating current distribution monitoring system, a medium-voltage direct current distribution monitoring system and a low-voltage direct current distribution monitoring system, is used as a man-machine interface device for running and debugging of a medium-low voltage alternating current and direct current distribution network system, and has the functions of remote control and local control of the system, monitoring of the running state of the system and recording and displaying of event information; the looped netowrk cabinet disposes in the cable run of interchange distribution rack and direct current distribution rack, includes: a traditional ring main unit and an intelligent ring main unit; the traditional ring main unit is provided with a centralized data transmission device, the intelligent ring main unit is a secondary fusion ring main unit, and the intelligent ring main unit is provided with a distributed data transmission device; the cubical switchboard is disposed in the overhead line of AC distribution rack and DC distribution rack, includes: a section switch and a tie switch; the section switch and the interconnection switch are both primary and secondary fusion intelligent switches; the configuration cabinet is used for realizing the unified remote control of each device by the central controller and has the function of automatically switching the experimental topological structure; the valve control case is used for coordinating and controlling the bridge arm, receiving and executing the issued control instruction, and uploading the running state information, the alarm information and the trip information of the valve control system.
2. The flexibly configurable AC/DC hybrid power distribution network frame of claim 1, wherein the medium voltage AC bus, the low voltage AC bus, the medium voltage DC bus and the low voltage DC bus are connected in series and parallel by a modular multilevel converter topology, a bidirectional active bridge, a bidirectional isolated DC/AC inverter, a voltage source converter and a distribution transformer.
3. The flexibly configurable AC/DC hybrid power distribution grid structure of claim 2, wherein the medium voltage AC bus and the medium voltage DC bus are connected by a cascaded H-bridge type MMC current converter; the medium-voltage alternating-current bus and the medium-voltage direct-current bus are connected through the VSC;
the low-voltage alternating current bus is respectively connected with the direct current output port of the MMC converter station through a bidirectional isolation type DC/AC inverter to form a low-voltage interconnection alternating current bus; the low-voltage direct current bus is respectively connected with a medium-voltage direct current output port of a cascade H bridge in the MMC converter station through DAB to form a low-voltage connection direct current bus;
the primary side of the distribution transformer is connected with a medium-voltage alternating-current bus, and the secondary side of the distribution transformer is connected with a low-voltage alternating-current bus.
4. The flexibly configurable AC/DC hybrid power distribution grid structure of claim 1, wherein the voltage class of the medium voltage AC bus is 10kV, the voltage class of the low voltage AC bus is 380V, the voltage class of the medium voltage DC bus is ± 20kV, and the voltage class of the low voltage DC bus is ± 750V.
5. The flexibly configurable alternating current-direct current hybrid power distribution grid structure according to claim 1, wherein the medium-low voltage alternating current-direct current integrated monitoring system adopts IEC 61850 standard communication.
6. A prototype testing system, comprising: the device comprises a medium-voltage alternating current true test system, a low-voltage alternating current true test system, a medium-voltage direct current true test system and a low-voltage direct current true test system;
the medium-voltage alternating current true test system, the low-voltage alternating current true test system, the medium-voltage direct current true test system and the low-voltage direct current true test system are all built based on the flexibly configurable alternating current-direct current hybrid power distribution network frame of claim 1;
the medium-voltage alternating-current true test system and the low-voltage alternating-current true test system are used for providing a true test scene of a typical grid structure and an operation mode of the alternating-current power distribution network in a mode of flexible switch configuration presetting; the system is used for developing one or more tests of primary and secondary fusion equipment, single-phase earth fault line selection and section selection, power distribution automation system and power distribution terminal function tests, distribution network relay protection operation tests, neutral point equipment function verification tests, intelligent power distribution equipment inspection and power distribution network lightning protection;
the medium-voltage direct-current true test system and the low-voltage direct-current true test system are used for establishing a typical topological structure of flexible direct-current transmission and distribution demonstration engineering through flexible configuration of a direct-current bus distribution device and researching the operation characteristics and performance indexes of a direct-current distribution network in different application scenes.
7. A vacuum testing system according to claim 6, wherein said medium voltage AC vacuum testing system comprises: the system comprises an isolation transformer, a ring main unit, a switch cabinet and neutral point equipment; the isolation transformer is used for being connected between a power grid 10kV incoming line and a medium-voltage alternating-current bus; the ring main unit is used for connecting different medium-voltage alternating-current buses and isolation transformers; the neutral point equipment is connected with the medium voltage alternating current bus through a switch cabinet.
8. A vacuum testing system according to claim 6, wherein said low voltage AC vacuum testing system comprises: the system comprises a distribution transformer, a low-voltage incoming and outgoing line switch cabinet, a hybrid energy storage device, an intelligent capacitor bank, an intelligent phase-change switch system, a static reactive power compensation generator, a wind generating set, a photovoltaic power generation device and a programmable alternating current PLC analog load; the distribution transformer is connected between the medium-voltage alternating-current bus and the low-voltage alternating-current bus, and other equipment or devices are connected to the low-voltage alternating-current bus.
9. A vacuum testing system according to claim 6, wherein said medium voltage DC vacuum testing system comprises: the system comprises an MMC converter, a starting cabinet, a bridge arm reactor and a bridge arm current sensor; the front end AC end of the MMC converter is connected with a medium-voltage alternating current bus, and the DC end of the MMC converter is connected with a medium-voltage direct current bus; and the bridge arm reactors and the bridge arm current sensors are connected to the bridge arms of the MMC current converter.
10. A vacuum testing system according to claim 6, wherein said low voltage DC vacuum testing system comprises: the system comprises a direct current ring network system, a hybrid energy storage device, a wind generating set, a photovoltaic power generation device and a programmable direct current PLC analog load; the direct current ring network system is formed by connecting a medium-voltage direct current bus and a low-voltage direct current bus to form a ring network through DAB; the rest of the equipment or devices are connected to the low-voltage direct-current bus.
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