53 results about "Double loop network" patented technology

The invention discloses a double loop network-based protection device free of a main in-situ transformer and a protection method. The double loop network-based protection device free of the main in-situ transformer comprises in-situ protection sub-machines, which are arranged at a high-voltage side, a medium-voltage side and a low-voltage side of a transformer respectively; the protection sub-machines are in hand-in-hand connection through double loop networks; each protection sub-machine collects the analogue quantity and the switch quantity of the side in situ, and is in bidirectional communication with the other protection sub-machines through the double loop networks to share data; each protection sub-machine comprises the same main and backup protection-integrated protection module for the transformer; a circuit breaker is arranged between each protection sub-machine and the side of the transformer; and each protection module trips off the corresponding circuit breaker according to the set backup protection action conditions and differential protection action conditions. By the double loop network-based protection device free of the main in-situ transformer and the protection method, the problem that a host of an existing protection device with the main transformer cannot be installed in situ is solved; and furthermore, multiple sets of differential 'conjunction gate' logics are adopted by the protection device, so that the protection reliability is improved.

The invention discloses a wind-field communication network with double-loop redundancy, which includes a communication and monitoring station of the fan controller, wherein the wind-field looped network is comprised among the fans. The wind-field looped network applies the optical fiber looped network of the topological structure with the double-loop self-healing policy, which comprises the following parts: a fiber channel data code, a communication protocol, an MCU hardware module, an Ethernet hardware module, a fiber interface module, a CAN module, the other communication interface module and a power module, wherein the monitoring station remotely accesses the operation state of every fan directly by the Ethernet hardware module, the communication controller of every fan is connected with the fiber network of the wind field by the fiber interface module and communicates with the other fans and the master communication controller, CAN module communicates with the other controller of the fan provided double CAN by the interior of MCU hardware module, MCU hardware module sends the data and the order to the wind-field looped network by the fiber interface module according to the corresponding communication protocol or the other controller in the fan by CAN module after calculating and judging the received communication data and the data of the sensor. The topology network structure of the invention is provided with the short cable, which is fit for fiber and error transmission; the fiber network transmission media of the invention is provided with the high transmission efficient, the long distance, the strong electromagnetic anti-interference ability; the double-loop network structure of the invention achieves the self-healing function of the network; the DNP 3.0 regulation in the total wind-field communication dissolves the broadcast storm problem.

The invention discloses a drilling machine integrated double-loop network coupling control system based on an IPC and a PLC. The system comprises a main operation platform connected with a client, wherein the main operation platform is connected with a main operation platform PLC station, and the client, a CCTV controller and a first server are all connected with a network NET2. The network NET2 is connected with a network NET1 which is connected with a first remote monitoring station. The first server and the main operation platform PLC station are respectively connected with a network NET3 and a network NET4. The network NET3 is connected with the network NET4. The network NET3 and the network NET4 are respectively and correspondingly connected with a first PLC station, an intelligent anti-collision control station and a redundant PLC control station. According to the system, the control system becomes automatic, intelligent and networked, and quick responding and remote concentrated operation and maintenance are achieved.

The invention discloses a BAS control system of urban railway system and a method thereof. The BAS control system comprises a station level integrated monitoring system network and a BAS field level network, wherein the station level integrated monitoring system network is provided with a redundancy scheduling module, the BAS field level network is in a double loop network structure and comprises at least two redundancy PLCs and a redundancy scheduling module, the redundancy PLCs are divided into a main PLC and a spare PLC and are connected to the station level integrated monitoring system network through the loop network, and the redundancy scheduling module is used for detecting communication states so as to be switched to the spare PLC; the method comprises the following steps: detecting whether the communication between the station level integrated monitoring system network and the main PLC is interrupted through the redundancy scheduling module, and if so, then switching the spare PLC into the main PLC by the redundancy scheduling module. The invention is favorable for lowering the construction cost of the BAS system and reducing the difficulty in integrating a BAS subsystem by an ISCS, and can ensure the uninterrupted and undisturbed automatic switching operation of controlled equipment and modes when a fault appears in any single node.

The invention relates to a power supply system, in particular to a chain extension power supply system, which is applied to bar-shaped and zonal urban regions. In a set region, three power points distributed in a bar shape are provided, four feeder lines are formed between every two adjacent power points, each feeder line adopts a multi-segment connection mode, and power is supplied to the regionby feeder line units of a double-loop network. The chain extension power supply system initiatively put forwards a chain extension intermediate-voltage distribution network power supply mode suitablefor the standardization and differentiation of bar-shaped and zonal regional forms, has high symmetry and uniformity, optimizes the power distribution points of a high voltage distribution networks and reorganizes the network structure of an intermediate voltage distribution network, thereby improving the power supply reliability of the distribution network, shortening the power failure time of aser, enhancing the power supply transferring capability of the distribution network, gradually eliminating power supply 'bottlenecks' and weak links, enhancing the resistance of the distribution network to natural disasters and providing strong support for the construction of the distribution network. In a development process, the power supply system has relatively higher extensibility, and the reliability of the system is fully ensured.

The invention provides a comprehensive dispatching and control system of modern trams. The comprehensive dispatching and control system of modern trams comprises a control center, a plurality of station subsystems and a plurality of car depot systems. The control center comprises a center display unit, a database server, a real-time control module, a central communication module, an asset management module and a printing module, wherein the center display unit, the database server, the real-time control module, the central communication module, the asset management module and the printing module are connected through a center local area network. Each station subsystem comprises a station communication module, a station control module and a station display unit, wherein the station communication modules, the station control modules and the station display units are connected through a station local area network. Each car depot system comprises a car depot communication module, a car depot control module, a car depot display unit and a simulation experiment and test module, wherein the car depot communication modules, the car depot control modules, the car depot display units and the simulation experiment and test modules are connected through the station local area network. The central communication module is connected with the station communication modules and the car depot communication modules through a redundant optical fiber double-loop network. The comprehensive dispatching and control system of modern trams solves the problem that an existing train dispatching system is poor in linkage and is high in integration level and operation efficiency.

The invention relates to the technical field of network communication in a nuclear industry and provides a double-loop network bit error rate test method. According to the test method, an original data packet for a test and a test starting or ending signal are generated through a computer. The method comprises the steps of obtaining the original data packet for the test and the test starting or ending signal generated by the computer and storing original data; if the obtained signal is the test starting signal, sending the original data packet to at least two adjacent network nodes adjacent to a tested network, wherein a reverse double-loop network is formed between the at least two adjacent network nodes; after the original data packet passes the at least two adjacent network nodes along two different directions in the reverse double-loop network, generating a target test data packet; and receiving the target test data packet and judging a bit error rate of the reverse double-loop network according to a comparison result of the original data packet and the target test data packet. The problem of testing the bit error rate of the reverse double-loop network can be solved.

The invention relates to a ring network unit and a double-ring network type distribution network, comprising a plurality of spacing units; Each spacing unit correspondingly comprises a ring incoming line, a ring outgoing line or a feeder line, each spacing unit further comprises a spacing DTU and a current transformer arranged on the ring incoming line, the ring outgoing line or the feeder line corresponding to the spacing unit; The interval DTU is connected with a current transformer in the same interval unit and also connected with an actuator in the same interval unit. A loop network structure of a distribution network is divide into loop intervals, loop-out interval, feeder interval, by use of the Plug and Play, Based on the distributed DTU and optical fiber differential protection function of primary and secondary fusion, the fast cut-off and overcurrent protection function can realize the fault isolation of distribution network without relying on the master station, and avoid thetraditional fault isolation overstep trip problem of distribution network and the switch life shortening and impact problem caused by multiple closing switches.

The invention discloses a power line path optimization method adopting a genetic algorithm, which performs optimization on a cable loop network path by adopting the genetic algorithm. The power line path optimization method comprises the steps of encoding n cable single-loop network cabinets and / or cable double-loop network cabinets, randomly generating a random permutation of n integers with the interval being [1, n], and forming a chromosome; selecting a fitness function used for judging the fitness of the chromosome for a target, wherein the fitness function is shown in the description; determining the population number N, the maximum algebra Gmax, the crossover probability pc and the mutation probability pm; and selecting an individual with a high fitness value by adopting a roulette mode to act as a male parent, wherein the roulette is selected according to the fitness of individuals, individuals with a high fitness value are selected, individuals with a small fitness value are removed, evaluation is performed on each chromosome in the new population, optimal individuals are stored, and an optimal solution is outputted. Compared with manual wiring, the power line path optimization method not only reduces the labor cost, but also improves the design efficiency. In addition, the power line path optimization algorithm is flexible and reliable, and saves the enterprise cost.

The invention discloses a two-stage power distribution double-loop network system of a ship main power station, namely the system comprises a primary power distribution unit and secondary power distribution unit. The primary power distribution unit is a high-voltage power distribution unit, and the secondary power distribution unit is a low-voltage power distribution unit. A high-voltage power distribution line and a low-voltage power distribution line are loop lines. The two-stage power distribution double-loop network system performs functions of improving power supply reliability and improving power supply capability of the main power station in an emergency. In the second power distribution unit, a low-voltage power generator set is utilized for supplying a standby main power supply. When the primary power distribution unit fails caused by any reason, the secondary power distribution unit can satisfy an electric power consumption requirement in navigation of the ship, thereby ensuring high navigation safety. When high-voltage power generators in the primary power distribution unit fail totally, low-voltage main power generators in the secondary power distribution unit can supply standby high-voltage main power supply to a high-voltage power distribution cabinet through boosting by a main power distribution transformer, thereby sustaining normal equipment operation of the power distribution unit in each load area. Compared with a traditional low-voltage ship power supply line, the two-stage power distribution double-loop network system of the ship main power station has advantages of facilitating energy saving and emission reduction, improving voltage quality, reducing damage caused by shortcircuit and facilitating cable laying.

The invention discloses a method and a device for simulating a CRH2 train network. By arranging a node model including a central node and a terminal node, through mutual communication connection through a double-loop network bus, a network model is formed. The node model is achieved through a data generation module, a data control module, an ARCNET protocol achieving module and a looped network data receiving and sending port. The data control module is in communication connection with the data generation module, the data control module and the ARCNET protocol achieving module and the looped network data receiving and sending port. The technical effects are that compared with a traditional CRH2 network simulation method, the structure adopted by the provided network simulation method is consistent with the actual network structure, so the CRH2 train communication network can be quite precisely simulated, and quite persuasive data can be acquired.

The invention discloses a local unowned bus protection realization method. The method comprises the following steps: each internal protection son-machine adopts local protection device to realize thedistributed busbar differential protection based on a bi-directional ring network; each internal protection sub-machine locally collects the current, the voltage analog quantity and switch quantity atthis side, and bi-directionally communicates with other protection son-machines through the double-loop network to share the data; each interval protection son-machine realize the internal own protection function, for instance, the line protection son-machine realizes the line protection light equation, distance, overcurrent and like protection functions; the interval protection son-machine tripsoff the corresponding circuit breaker according to the own protection action condition and the bus difference protection action condition. Each interval local protection is used as the bus protectionson-machine, each interval local protection only collects the analog quantity and the switch quality of this side, and the data is shared through the double-loop network, so that the son-machine is small in volume and can be locally installed, and the original bus protection device is reduced.

The invention discloses a diamond type power distribution network. The diamond-type power distribution network comprises a plurality of transformer substations, a plurality of switching stations and aplurality of looped network stations, the diamond-type power distribution network adopts a layered and graded structure and is divided into a backbone network which is formed by a transformer substation and a switching station, takes the switching station as a core node, supplies power to four circuits of a bilateral power supply nearby, is connected with a double-loop network and operates in anopen-loop manner, and a secondary backbone network which is formed by the switching station and a looped network site, takes the looped network site as a node and takes the switching station; and a transformer substation in a backbone network is provided with self-healing devices according to 10kV outgoing line intervals, and a switching station is provided with a self-healing protection control device according to bus sections. According to the invention, the switching station double-loop network is used as the backbone network; and the diamond type power distribution network has good power supply and user access adaptive capacity, flexible inter-station load transfer and balance capacity and rapid network fault self-healing capacity, has good economy and implementability in central urbanpower distribution network construction and transformation, and lays a solid foundation for realizing high-quality development of a power distribution network and constructing a first-class energy internet.

The invention provides a medium voltage cable network networking method. The method comprises the steps that 1, a 10KV bus of two substations or different 10KV buses of the same substation in the same power supply area are used as a power supply, wherein lines contact with each other to form a looped network and carry out open-loop operation; 2, a contact normally open point is arranged at each looped network point; and 3, two contact normally open points of each line are arranged in different ring main units, and a contact normally open point in the middle of the line is arranged at the halving point of a line load. When a cable network provided by the invention is in normal operation, each line load is connected with the accessed bus. When a fault occurs, the contact normally open points of the looped network points on both sides of the fault point carry out fault isolation. A load in front of the fault point is connected with an originally accessed bus. A load behind the fault point is connected with a bus which accesses a group line. In a high-reliability power supply area, if a medium voltage cable network networking method is unable to transit to a standard double looped network, the power supply reliability can be improved through the networking method provided by the invention.

The invention discloses a composite grid structure with reliable power supply, and relates to the technical field of power distribution network grid structures and power distribution automation. The structure comprises a backbone network, a branch network and a power distribution switch monitoring terminal which are connected with one another, the backbone network is a double-petal type backbone network; the branch line network is a double-loop network which is composed of four power distribution rooms and comprises two branch loops. The number of the first-stage power distribution rooms in the four power distribution rooms is two; the number of the secondary power distribution rooms is two, the two branch loops are the same in structure and are respectively a first branch loop and a second branch loop, end points of the two branch loops at the side of each primary power distribution room are correspondingly connected with two sections of buses of one switching station in the backbonenetwork in a one-to-one correspondence manner, and the two secondary power distribution rooms are connected through a connection cable and operate in an open-loop manner; the power supply reliabilityof the distribution network is improved through the double-petal backbone network, the branch network of the double-loop network, the distribution switch monitoring terminal and the like.

The invention is a method for realizing protection switch in group two-ring net; it belongs to computer network technology field. After initializing, the invention sets the logic state and physical state by one side of the ring net joint; the side sends application to adjoining joint and side timely; the other side and joint receive the application form adjoining joint; then carries on process to the received application, and places the application which can't be process into the hang-up queue; finally, the invention completes the switch of logic state and physical state. The invention uses side as the base operation unit, but not joint, the invention is simple and convenient.

The invention discloses a distribution network automation communication system, which is characterized in that an optical fiber access device (1) is connected to four optical modems (4) and a wireless public network acquisition device (3) of a first feeder terminal unit (9), the optical modems (4) adopt a double-loop network connection mode, connected nodes are connected in series in a bidirectional closed-loop manner, one of the optical modems (4) is connected to a first network switch (5), the first network switch (5) is connected to a communication management machine (7) connected with a switch cabinet (8), one of the optical modems (4) is connected to a second network switch (6), the second network switch (6) is connected to a carrier acquisition device (2) connected with a second feeder terminal unit (10), and one of the optical modems (4) is connected to a transformer terminal unit (11). The distribution network automation communication system is stable and reliable in communication, wide in coverage range and high in self-healing capacity.

The invention relates to a double loop network distributing line fault handling method by means of cooperation of spare power automatic switching and distribution automation. The double loop network distributing line fault handling method by means of the cooperation of the spare power automatic switching and the distribution automation is characterized by firstly utilizing advantages of high movement speed and reliable movement of the spare power automatic switching when faults occur by means of cooperation of the spare power automatic switching and the distribution automation to quickly resume power supply of power-loss loads; then performing correction control by means of centralized intelligent distribution automation, optimizing and adjusting fault handling results on the basis of global information, and further generating a remedy when the spare power automatic switching handling fails to make up a limitation that a spare power automatic switching is only based on local information. The double loop network distributing line fault handling method by means of the cooperation of the spare power automatic switching and the distribution automation can well meet requirements of double loop network distributing line fault handling and improves fault handling performance and power supply reliability.

The invention relates to a fault-tolerant protecting technology for digital discrete software and hardware, comprising the discrete technology and the fault-tolerant technology; wherein, the discrete technology realizes the discreteness of protecting software and hardware by distributed protection of CPU system based on double-loop network structure. The fault-tolerant technology comprises that: the hardware fault tolerance is realized by parallel processing of multi-CPU; protecting principle algorithm fault tolerance is realized by smart ANN technology; based on the different digital filters employed by power frequency parameter protecting principle and the wavelet filters employed by transient protection of transient signal; the filter is designed with a view to the dynamic fault-tolerant performance index, to improve the dynamic fault-tolerant performance of digital filtering algorithm; bad data in the data protection is detected and rejected which realizes information fault tolerance. The invention adopts the structure of discrete software and hardware, and the hardware employs fault-tolerant design, and the software allocates the functions of hardware; thus the invention has the advantages of algorithm fault tolerance and information fault tolerance, which respectively take the hardware adventure of the protection unit and the software adventure of the protection unit and the reliability of protection unit is improved.

The invention provides an improved dual-loop DFIG low voltage ride through control strategy under the unbalanced voltage, aims to prevent a wind turbine off-line phenomenon caused by grid voltage dropand achieve low voltage ride through operation of a doubly-fed induction generator (DFIG). According to a mathematical model and control requirements of a grid-side converter, two types of control targets are designed, a corresponding current command is derived, flexibility of a voltage control link is improved by designing a BP neural network PID controller, the control structure is simplified,a current command value is transformed to a two-phase stationary coordinate system in combination with an improved proportion resonant (PR) controller, and positive and negative sequence simultaneouscontrol of the current part is achieved. An improved dual-loop network side control system is constructed, problems that DC bus voltage fluctuation is too large during low voltage crossing and the ACside current contains negative sequence components are solved, at the end of the paper, the proposed method is verified by simulation, and effectiveness and feasibility of the method are proved by theresult.

The invention discloses a high-low voltage dual-power double-loop network power supply system, which comprises a No.1 power distribution room and a No.2 power distribution room, and is characterized in that a high-voltage side trunk line of the No.1 power distribution room is connected with a power supply A and a power supply B through a high-voltage circuit breaker, and a trunk line of the powersupply A and a trunk line of the power supply B respectively penetrate through the No.1 power distribution room and are connected with the No.2 power distribution room; the main line of the power supply A and the main line of the power supply B in the No.1 power distribution room are connected through a DL1 circuit breaker, the DL1 circuit breaker is connected with a spare power automatic switching device, and the main line of the power supply A and the main line of the power supply B in the No.2 power distribution room are connected through a DL2 circuit breaker; the power supply A and the power supply B supply power together, and each power supply can form a closed-loop power supply loop. The technical problem that in the prior art, one main trunk line and the other main trunk line of each power supply are connected to form a loop network with multiple power supply inputs, and power failure is caused by open-loop operation when the power supplies are damaged is solved.

The invention discloses a train and a control network structure thereof. The train control network structure comprises a first Ethernet ring network topology structure which is used for transmitting first train control data and train information service data, and the train information service data comprises video data and service data of a train information service network; and the second Ethernet ring network topology structure is used for transmitting second train control data, and part of the second train control data comprises train control data redundant with the first train control data. According to the invention, a double-loop network topological structure is adopted between the vehicles, and two communication nodes are provided in each vehicle, so that the redundant transmission of the train control data and the train information service data is effectively realized, and the requirement of transmitting a large amount of data is well met, thereby greatly improving the train network operation efficiency.

The invention discloses a rhombic power supply topological structure of a diamond-shaped power distribution network. The structure comprises transformer substations, and further comprises a switching station and a ring network station, wherein two adjacent transformer substations are connected through a backbone network cable, a plurality of main nodes are arranged on the backbone network cable, the main nodes are switching stations of which all incoming and outgoing lines are provided with circuit breakers, and the switching stations are powered by double-side power supply four loops and are of a double-loop network structure in open-loop operation. Each switching station is externally connected with a secondary trunk network cable, each secondary trunk network cable is provided with a plurality of secondary nodes, each secondary node is a ring network station in which all incoming and outgoing lines are provided with ring network switches, and the ring network station takes the switching station as a superior power supply to form a single-ring network powered by a single-side power supply or a double-ring network powered by a double-side power supply; and the backbone network cable and the secondary trunk network cable of two adjacent transformer substations form a diamond power distribution network covering the diamond-shaped area. According to the invention, the problem of insufficient inter-station load balance capability caused by different capacities of different substations can be solved.

The invention discloses an arc light data uploading method based on a fiber double-loop network. The method comprises the following steps of (1) making a plurality of arc light expanders and two arc light protecting devices inside an arc light protecting system connected through fibers and interconnected through an HSR protocol to form a fiber double-loop network structure; (2) uploading locally sampled arc light data through each arc light expander with a 0.5ms interval to achieve arc light data sharing between the two arc light protecting devices, wherein, the arc light data are HSR protocol messages; (3) transmitting and receiving arc light data by each node through the other fiber loop network when one fiber loop network is faulty. The arc light data uploading method based on the fiber double-loop network achieves high-speed and reliable communication among the arc light expanders and the arc light protecting devices and solves various problems in a conventional arc light protecting system. The method which further improves the arc light protecting motion speed and reliability has a great application prospect.

The invention discloses a 10 kilovolt double-loop self-healing system self-adaptive adjustment strategy based on dynamic topology identification, and belongs to the field of control. Firstly, all intelligent terminals are numbered and uploaded to a host, global topology generation is achieved in the host, and an initial topological structure of the self-healing system is obtained; furthermore, when a newly added switching station exists in the system or the position state of the circuit breaker is changed due to a fault, the self-healing system performs topology updating in real time to generate a new dynamic topology structure, and redefines the stage number of each switching station in the system; and finally, aiming at the change of the stage number of the switching stations, the backup protection setting value of each switching station and the segmented backup power automatic switching action time are adjusted according to an adaptive adjustment strategy to form a new protection strategy so as to adapt to the current topological structure. Therefore, effective protection and reasonable self-healing of the 10-kilovolt double-loop network in the flexible change process of the topological structure are realized. The method is suitable for the field of self-healing operation and self-adaptive operation management of a 10-kilovolt double-loop network power supply system.

The invention discloses a high and low voltage dual power supply double ring network power supply system, which includes No. 1 power distribution room and No. 2 power distribution room. The main line of power supply A and the main line of power supply B respectively pass through No. 1 power distribution room and are connected to the high-voltage side of No. 2 power distribution room through a high-voltage circuit breaker. In No. 1 power distribution room, the main line of power supply A and the power supply The B main lines are connected through the DL1 circuit breaker, and the DL1 circuit breaker is connected with a backup self-switching device. A and power supply B jointly supply power, and each power supply can form a closed-loop power supply loop, so as to solve the problem that in the prior art, one trunk line and another trunk line of each power supply are connected to form a power supply consisting of multiple The ring network of the power input is prone to technical problems of open-loop operation when the power supply is damaged, causing a power outage.