45 results about "Master equation" patented technology

The invention discloses an electric wireless private network channel access control method based on service classification. The method is characterized in that an electric wireless private network comprises a master station computer, a front-end machine, a base station and data collection terminals, the data collection terminals are used for achieving electric negative control information collection, the data collection terminals are connected with the base station in a wireless self-organization network mode, the base station is connected with the master station computer through a wired link, messages are divided into at least six kinds in a wireless self-organization network formed by the data collection terminals and the base station according to service types, the message of each type corresponds to one priority level, and different waiting time intervals exist between the messages of different types in the channel access process according to the sequence of the priority levels. According to the method, the information transmission capacity of the electric wireless private network can be improved, and the real-time performance and reliability of emergency messages can be guaranteed.

The invention discloses an optical fiber time frequency hybrid transmission method. The method comprises the following steps that: a master station normally transmits a 10MHz frequency signal to a slave station, a narrow negative pulse is interpolated into a previous periodic signal high level within a whole second, and the frequency signal is calibrated in the whole second; the slave station restores the frequency signal by employing combinational logic and restores a timing signal through a trigger after identifying special calibration; the slave station simultaneously returns the received time frequency hybrid transmission signal to the master station in an original sample mode, wherein the hybrid transmission signal is used for the loopback time delay measurement of the master station; the master station restores the timing signal from the returned signal according to the method of the slave station, dynamically measures the time delay of the restored timing signal and a local timing signal, and combines with the fixed time delay of the equipment to calculate the phase precompensation of a frequency scale signal in one second; and the master station realizes uniform phase compensation in the next second by utilizing the calculated phase compensation, so that the restored frequency and timing signal of the slave station are synchronous with those of the master station. The optical fiber time frequency hybrid transmission method has the advantages of time service precision, low cost, convenient cascade connection and plug and play function.

An electronic control unit includes a serial communication circuit capable of easily confirming presence or absence of communication error while regular transmission / regular report between master station and sub station are performed timely. First and second control circuit sections 200a (master station) and 200b (substation) communicate mutually via series-parallel converters 117, 127. The master station includes regular transmission device 201 and irregular transmission device 211. The substation includes regular report device 221, confirmation reply device 205 and report reply device 215 relative to transmission data from the master station, and unprocessed data table 204. The confirmation reply device 205 and report reply device 215 confirm whether or not downstream communication from the master station to sub station is normal. When any error is present in regular report data through upstream communication, the error is confirmed on the fact the irregular transmission device 211 makes retransmission readout request.

The invention discloses an automatic adjustment method based on a planned power utilization information collection terminal, relating to the field of electric system. Currently, the terminal installation and the electric energy meter replacement need to be adjusted manually, need more personnel allocation, are influenced by power off, and have high error rate. The method in the invention has the following steps: inputting the terminal to be installed and the electric energy meter information needing to be replaced to a management module of a master station; sending the completed event information to the master station by the terminal after the terminal is installed or the electric energy meter is replaced; testing the communication between the master station and the terminal, and between the terminal and the electric energy meter by an adjustment module of the master station; and calling the operation parameters of the management module by the adjustment module of the master station after the communication is normal, and sending the operation parameter to the terminal. After the adoption of the automatic adjustment, the manual adjustment process is simplified, the adjustment personnel number of the master station is reduced, the line-up waiting that multiple adjustment requests are launched simultaneously is avoided, the error is reduced, and the operating efficiency is improved.

In a method for temperature control in MR-guided administration of ultrasound, ultrasound therapy is administered to a patient at an in vivo site by emitting focused ultrasound into the site at multiple foci with a multi-focus ultrasound therapy device. The temperature is monitored in a localized region of an examination subject in which the site is located firing said therapy in real-time by MR thermometry. From the MR thermometry, characteristics of the temperature distribution in the monitored region of the examination subject are automatically identified. Temperature control is implemented by regulating the energy output of the ultrasound therapy device, according to a rapidly converging master equation.

The invention provides an electric power line fault point location method and a detection terminal, a master station and a location system thereof. The detection terminal uses current, sound, shock wave, magnetic field, infrared ray, ultraviolet ray, visible light, air pressure and other sensors to detect physical quantity capable of reflecting electric power line short circuit fault characteristics and parameter data of the physical quantity related to the electric power line operation state and locally recognize the fault of the electric power line and determine fault time. After the detection terminal recognizes the fault of the related electric power line, the detected data are transmitted to the location master station. The location master station comprises a data receiving component, a data storage component, a data processing component and a human-computer interaction component. The position of the electric power line fault point is calculated according to the data provided by the detection terminal and the position of the detection terminal corresponding to the data so as to realize timely and accurate location of the electric power line fault and overcome the defects of the fault location system in the background technology.

The invention discloses a power distribution network self-healing control method combining master station and local control; the existing resources of local feeder line automation terminal informationcan be utilized, and self-healing control of automatic mutual cooperation of a power distribution network master station and a voltage time type feeder line is achieved, so that the method is suitable for fast positioning of faults suitable for various power distribution network topologies, and power distribution network fault positioning, fault isolation and post-failure power supply recovery combining the power distribution network master station and the local power distribution automation terminal control are realized.

A single-phase grounding fault locating method for a distribution network without a master station of the invention comprises the following steps: (1) each distribution terminal detects the zero sequence voltage value of a distribution network, and judges whether there is a single-phase grounding fault; (2) when there is a single-phase grounding fault, each distribution terminal takes the derivative of zero sequence voltage, compares the polarity of transient zero sequence current with the polarity of the derivative of zero sequence voltage, and identifies a single-phase grounding fault line; (3) a line meeting the condition that the polarity of transient zero sequence current and the polarity of the derivative of zero sequence voltage are opposite is selected as a fault line, and each distribution terminal sends a grounding fault locking signal containing level information to a higher-level line distribution terminal; (4) the distribution terminal at the fault point does not receive a grounding fault locking signal, and acts first to remove the grounding fault, and the distribution terminals upstream of the fault do not malfunction; and (5) if the distribution terminal at the fault point fails to remove the fault in time, the higher-level feeder distribution terminal delays the action exit gradually according to the received locking signal. Through the method, a grounding fault point can be located accurately even when a distribution terminal on a switch loses communication connection with a distribution monitoring master station system.

The invention discloses a unified modeling method of primary and secondary equipments for a substation and a dispatching master station. Foundation frame models of the primary and secondary equipments which conform to application needs of the dispatching master station and the substation can be built. The foundation frame models are expanded by the substation and the dispatching master station according to special needs of their applications, application models are formed, and finally, application model instances are changed into a relational two-dimensional table; and the integrated unified modeling of the foundation frame models of the primary and secondary equipments between the substation and the dispatching master station is realized by synchronously copying the model based on SOA (Semiconductor Optical Amplifier) service bus, and two model standards, i.e. IEC61970 and IEC61850, are fused, so that the progress of a power system technology and development of a smart grid can be promoted, and the unified modeling method has a good application prospect.

The invention provides a Bluetooth communication method of electric power metering on-site test data. The Bluetooth communication method is implemented by a mobile operation terminal serving as a master station and on-site test devices serving as slave stations. All on-site test devices are provided with address codes. A master-slave half-duplex communication method is adopted for communication between the master station and the slave stations for data exchange. Establishment and termination of communication links between the master station and the slave stations are controlled by information frames sent by the master station. An information frame is composed of seven fields: a frame start character, a slave address field, a control code, a data field length, a data field, a frame information longitudinal check code and a frame terminator. Each field of the information frame is composed of bytes. Data transmission and communication between the master station and the slave stations is performed according to set statutes. According to the method, data acquisition is simple, and communication statutes are concisely and clearly defined. The Bluetooth communication method can be implemented on site conveniently, can be used to automatically, quickly and accurately acquire electric metering on-site test data. The method is of strong applicability and good generality, and is convenient for promotion.

The present invention relates to a method for determining an edge profile of a volume of a photoresist after a development process. At first, the volume of the photoresist is divided into cells. A chemical master equation is set up which reflects the stochastic kinetics of chemical reactions proceeding in cells of the volume of the photoresist during the development process. The chemical master equation is solved for a given development time on the basis of a Gillespie algorithm in order to determine developed and non-developed cells of the volume of the photoresist at the end of the development process. Finally, the edge profile of the volume of the photoresist after the development process is determined on the basis of a cluster of non-developed cells.

The invention discloses a WAMS low-frequency oscillation identification function test system and a WAMS low-frequency oscillation identification function test method. The test system comprises an IEEE three-machine nine-node system which is built on a real-time digital simulator RTDS and used for simulating the running state of a power system under a preset low-frequency oscillation event, and a wide-area measurement system WAMS which includes multiple PMUs (Phasor Measurement Unit) and a master station system. The PMUs are connected with the three-machine nine-node system and the master station system, and are used for collecting dynamic phasor data of the simulated power system and uploading the dynamic phasor data to the master station system. The master station system is used for receiving the dynamic phasor data and analyzing the dynamic phasor data to identify the low-frequency oscillation event of the power system. The result of the master station system's analysis of the dynamic phasor data is collated with the preset low-frequency oscillation event to determine the performance of the low-frequency oscillation identification function of the WAMS. With the system and the method of the invention, the low-frequency oscillation identification function of the WAMS can be tested.

The invention discloses a power distribution dispatching master station integrated test framework. In an initial stage of development of a power distribution dispatching master station system, functions of all modules are verified, a development progress is accelerated, and errors are eliminated in time. In a later stage of the development, capacity testing, pressure testing and performance testing of the system are verified, and whether a CPU load meets design requirements or not is judged. A terminal data simulation generator provides up to thousand virtual terminal devices or hundreds of thousands of or even a million of remote signaling or telemetry data points according to user configuration data; and the verification matching correctness is changed through a small amount of data under the normal condition. Meanwhile, the performance simulation testing of a storm burst number to a complex networking environment is supported. The storm data testing is initiated; the main station system bears storm data impact to verify an interface change refreshing condition, a CPU performance condition and a computer server configuration requirement of the main station system; system multi-machine switching, historical curve and report verification can be realized; and the correctness and reliability of the main station power distribution system are tested as much as possible.

The present invention discloses a system and a method for test of a master station and a substation of an intelligent transformer substation phasor measurement unit (PMU). The system comprises a PMU tester, a PC substation client and a PC master station client. The PC substation client controls the PMU tester to send a current and a voltage which have time marks to a PMU collection unit, the PMU collection unit centrally stores the current and the voltage in the PMU collection unit and then sends the current and the voltage to a dispatching master station; data in the PMU collection unit are transmitted back to the PMU tester after being processed by the PMU collection unit; the PC master station client analyzes current and voltage signals, uploaded to the master station, of a PUM device to form a master station data file; and master station data and substation data are correspondingly compared through analysis of the PMU tester to complete error calculation of the current and voltagedata. The technical problem of master station and substation joint debugging testing in a current intelligent transformer substation PMU device test is solved, and validity and dependability of the test of intelligent transformer substation phasor measurement unit are improved.

The invention discloses a bidirectional allowable protection method employing a master station to identify a dynamic topology for a power distribution circuit. The method comprises the steps of firstly, dividing an FTU (Feeder Terminal Unit) into a boundary FTU and an intermediate FTU, and determining whether the boundary FTU is an initial-end FTU or a tail-end FTU or not by the master station through dynamic topology identification; judging whether an allowable signal is sent to an upper-level FTU and a lower-level FTU according to an overcurrent whether can be sensed by the FTU or not; controlling corresponding circuit breakers to do action according to the overcurrent whether can be sensed by the initial-end FTU, the tail-end FTU and the intermediate FTU and the allowable signal whether is received or not within a stipulated time; and outputting the actions of the circuit breakers if the overcurrent exists within time () after a fault to achieve fault protection between the initial-end FTU and an outgoing line circuit breaker. The method utilizes a network communication technology to complete action information exchange among adjacent levels of protection, the action delay brought by multi-level matching is effectively shortened, the fault is rapidly isolated, and the fault danger is reduced.

The invention relates to a method for accessing data to an IEC61850 fault recording master station from a converter station recording system. The method is characterized by comprising the steps that fault recording data areas of a professional fault recording device and all control and protection devices in a converter station are monitored by adopting a network directory mapping mode based on virtual modeling technologies, the professional fault recording device and all of the direct current transmission control and protection devices with a built-in fault recording function in the converter station are modeled into intelligent fault recording logic devices (LDs) conforming to IEC61850 standards, an intelligent gateway detects file generation of the fault recording data areas of all of the devices in real time and is responsible for real-time efficient communication with a fault recording master station system adopting the IEC61850 standards in a dispatching center, thereby ensuring the power grid dispatching center to acquire operational analysis data of key operations, abnormal situations and the like in the direct current transmission converter station timely and rapidly.

The invention provides a three-dimensional imaging tunnel geological advance forecaster and a forecasting method. The three-dimensional imaging tunnel geological advance forecaster comprises a host control terminal, a master station, an acquisition station and a triggering station; the master station is used as the management unit of a station, performs communication with the acquisition station, the triggering station and the host control terminal through wireless WiFi so as to transmit sampling data, and manages the triggering time of the triggering station and the acquisition state to be synchronous through a wireless communication manner; and a master station power management unit comprises a charging and discharging management module, a voltameter and a lithium ion battery. The three-dimensional imaging tunnel geological advance forecaster has the advantages that: all data interaction is carried out through wireless transmission, compared with the traditional wired data acquisition system needing a lot of cables and difficult in field wiring, the three-dimensional imaging tunnel geological advance forecaster does not need a lot of cables, and is convenient to install, small, portable and simple in field configuration; the synchronous sampling time error range of multiple acquirer is within 1-3 sampling points; and requirements of the tunnel geological advance forecaster on the time precision are satisfied.

The present invention discloses a wind farm single-ring network multi-point fault and poor contact / communication attenuation rapid positioning method. The method comprises the following steps that: a master station periodically sends heartbeat packets, after a sub-station receives the heartbeat packets, the sub station adds the state information of the sub station into the heartbeat packets and forwards the heartbeat packets to a sub station of a next level until the heartbeat packets of all sub station state information are returned to the master station, if the master station receives the heartbeat packets with all sub station state information, a network is normal, if the master station does not receive the heartbeat packets with all sub station state information, a single-ring network is failed, the last sub station which does not return the heartbeat packets is a first fault point, the heartbeat packet record recorded in the sub station is recorded at the first fault point, a next fault point is rapidly positioned, the steps are repeated to position multiple fault nodes, and according to the data loss packet number information in the heartbeat packets returned by the sub station, the sub station with poor contact / communication attenuation is positioned.

The invention provides a closed loop testing method of an integrated anti-mistake system of a master station and a substation and a closed loop testing system. The closed loop testing method includessteps that a master station anti-mistake system carries out an anti-mistake calibration on the basis of a preset testing case set, and sends a remote preset request to a preset simulation substation;the simulation substation responds a substation anti-mistake checking request sent by the master station and returns the checking result to the master station anti-mistake system through a preset power grid anti-mistake information collecting convention and interactive mode. Compared with the prior art, the method and the system can avoid many links from operation of regulators to correct responseof a substation device to the whole process through not interlinking with five-defense system of the actual substation system, thereby simplifying the structuring of the closed loop testing environment of the integrated anti-mistake system of the master station and the substation while also meeting the demand of function verification.

An information communication system which includes a master station and a plurality of slave stations and enables reduction of the processing time of the whole system. When the slave stations transmit response signals to the master station respectively, not only time slot numbers but also time delay numbers are generated. If a slave station detects that a second slave station transmits the response signal at a timing corresponding to the preceding time delay number in the same time slot, the former slave station is controlled not to transmit the response signal.

The invention provides a service data access and processing method and apparatus for a scheduling master station. The method comprises the steps of customizing a model data object set, a real-time data object set, a graphic data object set, a file data object set and a historical data object set, and performing model data, real-time data, graphic data, file data and historical data access on a substation; and processing model data, real-time data, graphic data, file data and historical data sent to the substation. An object-oriented service data interaction method is proposed; the bottleneck of interaction among the scheduling master station, communication and the substation is broken through; the restriction that the scheduling master station and the substation perform real-time data protocol transmission through a dot mark index table for a long time is broken through; the data on-demand acquisition is realized; and starting from real-time and historical data requirements for the substation, the interaction among the model data, the graphic data and the file data in addition to conventional 'four-remoteness' and alarm information is supported, so that the capability of interaction between the scheduling master station and the substation is greatly improved.

The invention discloses a method and a system for processing the asset information of a communication unit by a master station of an acquisition system, which comprises the following steps: obtainingthe identification information of a communication unit which is qualified in detection, and establishing the asset information file of the communication unit; the associated terminal information of each communication unit in operation is bound with corresponding identity identification information to perform asset relationship binding, and an asset information database of the communication unit isestablished; issuing a read call instruction to obtain the identity information of each communication unit; determining whether each of the acquired communication units is a conforming product; comparing the identity information of each communication unit in the qualified product and the identity identification information in the asset relationship binding data in the asset information database of the communication unit according to the assigned terminal information, and obtaining a comparison result; Generating an identity information change event when the identity information is inconsistent; the asset relationship binding is performed by changing the identity information of the communication unit corresponding to the identity information changing event and the associated terminal information.

The invention provides an interaction method and system for a master station and sub-stations of an operation and maintenance system. The method includes the following steps: when the master station receives one or more requests for obtaining operation and maintenance signals sent by a request initiation sub-station, acquiring a signal providing sub-station respectively corresponding to each request according to a pre-generated forwarding table; and enabling the master station to feed back the operation and maintenance signals acquired from the signal providing sub-station to the correspondingrequest initiation sub-station, wherein the forwarding table includes a list of signals selected according to a transformer substation total station configuration description file sent from the sub-station. By adopting the method, the communication with the master station and the sub-stations of the system does not need to select a signal telecontrol data communication gateway forwarding table, artificial peer-to-peer is also not required between the master station and the sub-stations, the debugging efficiency that the operation and maintenance sub-stations access the master station can be greatly improved, and a plug and play function of the operation and maintenance system can be realized.

The invention discloses a simulation test method and system for massive measurement data. The method comprises a step of determining the number of virtual power distribution terminals and connecting all virtual power distribution terminals to a tested master station based on the quantity of measurement data to be generated, a step of grouping each virtual power distribution terminal and controlling the virtual power distribution terminals in each group to simulate distribution network operation data to generate the massive measurement data, and a step of allowing each virtual power distribution terminal to parallelly upload the massive measurement data to the tested master station and generating a performance analysis result of the tested master station. According to the invention, the distributed packet data management is applied to the virtual power distribution terminals, the massive measurement data is generated, the tested master station is parallelly visited through multiple threads, the test level of a master station system and test work efficiency can be greatly improved, and a standardized, scientific and real test result can be provided for test evaluation.

The present invention relates to the field of power grids, and particularly relates to an optimization method for active reporting of a power failure event concentrator in a transformer area. The method of the present invention uses a concentrator to monitor a voltage anomaly for screening effective power failure information. After the concentrator monitors the voltage abnormality, the concentrator collects a set of concentrator AC sampling voltage again. After a power failure event is determined initially, the power failure event is recorded and the total meter voltage in a transformer area is interrogated actively. After the power failure event in the transformer area is judged initially, the power failure event is reported to a master station. After a collecting master station receivesthe power failure event, the total meter voltage in the transformer area is copied for secondary judgment. If the power failure event in the transformer area is also determined in the secondary judgment, the master station sends the power failure event to a distribution network repair platform to arrange corresponding repair working personnel. The method of the present invention can improve the reliability of reporting the power failure event in the transformer area, save the resources of the master station, and strive for the time for the repair work of power failure.

The invention relates to a method for accurately judging an earth fault moment of a small current earthing system master station. The method comprises the steps of: 1, acquiring an earth fault waveform by using the system master station; 2, computing an initial difference gear I of the faulted waveform; 3, acquiring a current difference gear D of the faulted waveform; 4, finding suspicious fault moment points; 5, judging continuous transient mutation; and 6, calling back the suspicious fault moment points. From the technical scheme above, it can be known that the probability of finding the small current earth fault moment point can be improved, and thus the transient polarity, amplitude and similarity computed based on the found fault moment point are accurate and valid.