240 results about "Digital substation" patented technology

The invention discloses a multi-parameter identification based secondary system fault diagnosing method for an intelligent substation. The multi-parameter identification based secondary system fault diagnosing method is mainly applicable to digital substation accordant with IEC61850 communication protocol. The method includes: comprehensively analyzing multi-dimensional parameters including various alarm information, telemeasuring data, telecommand states and the like of a process layer, a spacer layer, a station control layer through a network message recording and analyzing device, monitoring states of secondary devices in real time by utilizing original messages as analysis data and utilizing recording of transient state of device exception and long-term monitoring of operation states as means, and realizing fault diagnosis and state monitoring of the secondary system of the intelligent substation. The multi-parameter identification based secondary system fault diagnosing method for the intelligent substation has the advantages in two aspects including that normal states of the secondary device of the intelligent substation can be monitored, background data and maintenance reference are provided for state maintenance; exception states are identified, quick fault diagnosis is realized, effective instruction can be provided for transport maintenance, and convenience in maintenance of the substation is improved.

The present invention relates to a sampling value processing method of integrative device based on a sampling value interface, which is used for protecting and monitoring a digital substation. The method is characterized in that the sampling value interface module of the integrative device is used for real-time judgment on the effectiveness and rationality of sampling values which are transmitted from an incorporating unit; the secondary Lagrange interpolation are calculated for a small quantity of broken or lost sampling values; a window function is used for designing a high-order FIR digital filter which is used for filtering the sampling values; the on-line parameters of the threshold and the filter are regulated in a self-adapting way according to the parameters of conventional data sets transmitted by the sampling values; the protection function is resampled by adopting a secondary Lagrange algorithm of fixed frequency according to the requirements of protecting and monitoring functions; the monitoring function is first processed by iterative computation of frequency; the real-time resampling frequency s regulated according to the signal frequency; the sampling values are resampled by adopting the secondary Lagrange algorithm according to the novel sampling frequency, thus the processing method not only satisfies the requirements of protection and application, but also improves the measurement accuracy.

A comprehensive detecting and analyzing platform for performance of digital electric energy metering systems of intelligent transformer substations is provided with a detecting system and a background expert system. The detecting system comprises an electronic transformer detecting system, a digital / digital-value-input electric energy meter detecting system and a digital electric energy metering comprehensive performance detecting system. By the background expert system, real-time monitoring and value tracing can be simultaneously carried out for electronic / optical current transformers, electronic voltage transformers, digital / digital-value-input electric energy meters and the like, and electric energy data of analog systems and multiple digital systems can be compared and analyzed so that the comprehensive performance of each digital electric energy metering system is detected. Detection results are comprehensive owing to multiple signal acquisition channels and comprehensive consideration on metering risk points of the systems, and the comprehensive detecting and analyzing platform is beneficial to improving metering accuracy for the intelligent transformer substations and digital transformer substations, and provides a good technical support for constructing the intelligent transformer substations and the digital transformer substations.

The invention provides a server-side simulating system based on an IEC61850 and a method thereof, which are applied to digital substations adopting the IEC61850 for communication and traditional substations. The system consists of a simulator terminal and a simulator console. The method comprises the following steps: loading an SCD model at the simulator terminal for analyzing; breaking out a CID model file needed by an IED; carrying out man-machine interaction in a tree diagram and tabular form to allocate one data generator for each module data; generating state sequence through the data generator; downloading the state sequence to the simulator control table; loading the CID model broken out by the simulator terminal on the simulator console for analyzing; establishing an IEC61850 database, organizing the trackback path information of the IEC61850 model orderly; addressing the IEC61850 database according to the model trackback path corresponding the data generator; refreshing the IEC61850 database state in real time; and interactively communicating with a station monitor and control layer through the IEC61850, thereby finishing the simulation of the IED server terminal. The invention can carry out simulating preview on the whole substation IED, greatly saves project debugging time and has the characteristics of strong operability, high efficiency, flexible configuration and the like.

The invention discloses a method for realizing seamless communication between a master scheduling station and a substation of a power grid. The method comprises: a model configuration step of establishing an international electrotechnical commission (IEC)-61850-standard-format-based whole-station unified configuration model file comprising a primary equipment model and a second equipment model in the substation; a secure file transfer protocol (sFTP) file transmission step of uploading data comprising the whole-station unified configuration model file to the master scheduling station through sFTP connection by using a telecontrol workstation in the substation; a model conversion step of converting the whole-station unified configuration model file into an IEC-61970-standard-format-based common information model comprising communication information; and a seamless communication step of establishing seamless communication connection between the master scheduling station and the substation. The invention also discloses a corresponding system for realizing the seamless communication between the master scheduling station and substation of the power grid. By the method and the system, the seamless communication between the digital substation and the master scheduling station can be realized under the condition of avoiding influence on the conventional substation and the master scheduling station as much as possible.

The invention relates to an on-site debugging method for a digital substation. The on-site debugging method includes steps of firstly, debugging protection single bodies of the substation; secondly, basically debugging primary equipment of the substation; and thirdly, debugging a system of the substation. Compared with the prior art, the on-site debugging method has the advantages of simplicity, convenience in use, high testing accuracy and the like.

The invention relates to a novel method for protecting a bus with voltage level of 35 kV and below 35 kV. The bus protection is performed by all measurement and control devices for outgoing line protection on the relevant bus segment, measurement and control devices of section breaker protection and measurement and control devices of incoming line protection (comprising interface units at the low-voltage side of the transformer). The method is characterized in that when a failure happens to the electric grid, the flow direction of the failure current can be judged by the dispersed protection units (measurement and control devices) so as to detect whether the failure happens to the bus. The interlocking trip information adopts GOOSE signals in accordance with the IEC61850 standard. The switching quantity is transmitted by adopting GOOSE channels. The collected analog quantity is transmitted by adopting an SMV service message in accordance with the IEC61850 standard. The method can be directly applied into the digital substations which are built based on the IEC61850 standard.

The invention relates to a nuclear phase method for a digital transformer substation, comprising the following steps: 1) in a digital transformer substation realized in a point-to-point mode, a nuclear phase device accesses high-speed serial communication data from different interval merging units, and sends the received communication data to a personal computer (PC), and the PC randomly selects one phase voltage as a standard and respectively and intuitively inspects the correctness of the amplitude and phase relation of each phase voltage of the same voltage class or different voltage classes, thereby completing secondary nuclear phase in the process of starting the digital transformer substation; and 2) in a digital transformer substation realized in a networking mode, the nuclear phase device accesses Ethernet communication data from different interval merging units by means of an IEC61850 switched network device, and then sends the communication data to the PC, and when carrying out voltage nuclear phase, the PC randomly selects one phase voltage as a standard and respectively inspects the correctness of the amplitude and phase relation of voltages of the same voltage class or different voltage classes.

The invention relates to a method for measuring the signal frequency and harmonic parameters of an electric power system. The frequency, the amplitude and the phase of harmonics are acquired through modifying two maximum spectrum lines close to real frequency points in FFT data acquired by applying seven term Rife-Vincent (I) window to sampling data, wherein the seven term Rife-Vincent W(n)=sigma<k>(i=0)(-1)bicos(2pi / Nin), n=0, 1,.. N-1, wherein b0=1, b1=12 / 7, b2=15 / 14, b3=10 / 21, b4=1 / 7, b5=2 / 77 and b6=1 / 462. The method provided by the invention is simple to implement and can achieve very high precision in harmonic analysis applications of a digital substation, and the calculation is smaller than a general cosine window.

The invention relates to a GOOSE mode networking spare power automatic switching method based on a digital transmission network, whole spare power automatic switching function is jointly completed by interval layers of different protected objects, various dispersed measurement and control units take charge of distinguishing whether has voltage, current and TV wire break and the like, discrimination results are transmitted to a main logic treatment unit in a mode of GOOSE signals through the digital transmission network, output results are also transmitted to the dispersed measurement and control units in the mode of the GOOSE signals through the digital transmission network to drive an intelligent switch to complete the whole logic function. Analog quantity is collected through using IEC61850 standard SMV service message and is transported to the measurement and control units, and a switching value and the logic discrimination results are transported by using a GOOSE channel. The whole spare power automatic switching function can be directly used for a digital substation which is built based on an IEC61850 protocol.

This disclosure relates to systems and methods for configuration-less process bus. In one embodiment, the system includes at least one process interface unit (PIU). The PIU includes at least one pre-configured communication port defined by one of a factory setting or a product code order. The at least one PIU is operable to transmit and receive a data stream. The data stream includes at least one dataset. The dataset includes at least one field for sampled values measured at least at one source. The source includes one of a current transformer or a voltage transformer. The dataset can further include a timestamp and a unique identifier associated with the source. The system can include at least one intelligent electronic device (IED) communicatively coupled to the PIU. The IED can be operable to receive the data stream from the PIU and transform the sampled values based on user-defined transformation factors.

The invention provides an object-oriented implementation method for an intelligent electronic device of a digital substation. The method comprises the following steps of: a) defining data type of an object according to a capability description file of the intelligent electronic device, wherein the data type packages attribute and behavior of the intelligent electronic device and declares the object; b) performing system configuration, namely configuring the object according to an instance configuration file of the intelligent electronic device to generate a standardized object configuration interface file; and c) reading the instance configuration file by the intelligent electronic device to generate an IEC61850 communication real-time information base, guiding the standardized object configuration interface file into the information base, establishing and initializing the object and associating the attribute of the object with the corresponding IEC61850 communication real-time information base. By using the method, an object-oriented design is adopted at an information source to ensure that functional software of the intelligent electronic device is seamlessly interinfiltrated with an IEC61850 object-oriented information model without data mapping, flexible configuration of the intelligent electronic device can be performed, and the software maintainability is high.

The invention discloses a method for protecting a low-voltage bus of an intelligent substation. The method is achieved through a bus protection device and branch protection measuring and control devices connected with the bus protection device in a cooperation mode, the bus protection device is started through steady current overflowing elements and current variable quantity elements of the active branch protection measuring and control devices, action allowing signals are sent to the bus protection device through power direction elements or the current overflowing elements of branches, and bus composite voltage blocking elements are adopted as the open condition of a bus fault. Internal and external faults of a bus region are judged by the bus protection device in the mode of combining starting signals and the action allowing signals, when the three conditions are met at the same time, the bus fault is judged, the bus protection device acts to remove the faulted bus, and a fault of a segmentation dead region and a fault of a transformer low-voltage side dead region can be judged and isolated. The bus faults with voltage classes of 35 kV and below can be removed fast and accurately, and the method can be directly applied to a digital substation or the intelligent substation.

The invention provides a time-delay characteristic testing device and method of a digital substation secondary signal transmission system. The time-delay characteristic of the digital substation secondary signal transmission system, namely any node between output of a merging unit and an intelligent electric device, can be tested. According to the time-delay characteristic testing device and method, an Ethernet interface and an optical fiber interface are compatible, a time-delay test signal with periodically-changed amplitude and the stable frequency is generated through a three-phase controllable amplitude modulation power source, the cyclic wave position is calibrated through the amplitude, and interference of whole cyclic wave time delay in a time-delay test is eliminated; a self-generating synchronous clock signal is adopted, strict synchronization of inner sampling and signal circuit sampling is guaranteed, and the time-delay characteristic detecting accuracy is guaranteed; the corresponding relation between an inner sampling point and a signal circuit sampling point is determined through window comparison, the time difference of the corresponding sampling points is computed in a compared mode to obtain time-delay characteristic information, and transmission time difference shaking information of a system can be reflected.

An integration unit for electric energy quality monitoring comprises a clock pulse synchronizing module M1, a sampling pulse output module M2, a data receiving and decoding module M3, an interpolation moment calculating module M4, an interpolation data processing module M5 and an assembly line control module M6 which are implemented through field programmable gate array (FPGA). The invention further provides a synchronous sampling method of the integration unit. By combining the synchronous pulse method with the interpolation method, the problem about low synchronizing accuracy caused by the use of single synchronizing method is effectively solved. Secondly, the problem about instable sampling accuracy during long-term operating is solved by adopting the self-adaption adjustment interpolation moment algorithm, and the problem about low accuracy of ultraharmonics is solved by adopting the third-order newton interpolation algorithm. In addition, the integral system adopts assembly line control mode and is guaranteed to stably operate at high sampling speed. The integration unit creates conditions for an electric energy quality monitoring device to access a digital substation.

The invention discloses a method for acquiring network data and analyzing network performance for a digital substation, which comprises the following steps: acquiring station control layer network messages and process layer network messages of the digital substation by forcibly setting a network card working mode and adopting the network sniffing technology, carrying out statistical analysis on communication network messages, and then, evaluating the network performance. The invention does not need to change the original network topologic structure of the digital substation and finishes the capture of station control layer network data and process layer network data under the condition that the normal operation of the substation is not influenced, thereby realizing the purposes of testing and evaluating the communication network performance and realizing the high degree of integration between the communication network and the digital substation. The method of the invention is suitable for acquiring network data and analyzing network performance for a digital substation of an electric power system.

The invention relates to a fault locking method for relay protection in a digital substation. In the relay protection, a plurality of IED (Intelligent Electronic Device) distributed fault detection elements are integrated with various fault identification criterions to effectively identify faults of a power system; a protection device and intelligent unit double-fault locking mechanism is adopted, wherein a process layer communication CPU (Central Processing Unit) on the protection device only releases GOOSE (Generic Object Oriented Substation Event) trip locking and forwards a GOOSE trip signal to an intelligent unit on the premise that a trip command for protecting the CPU and a fault detection FD open command exist simultaneously; and the intelligent unit only releases locking and trips on the premise that the GOOSE trip command and the FD open command are received simultaneously. On the basis of network information sharing, the fault locking method provided by the invention is integrated with various fault identification criterions to effectively identify the fault of the power system by adopting the plurality of the IED detection elements, and prevents false tripping caused by IED abnormality so as to improve the reliability of the power system.

The invention discloses a back-up protection processing method of a digital substation transformer based on a GOOSE mode. When the inner part or the adjacent area of a digital substation has a fault, under the condition that the main protection information of a transformer is lacking, the invention provides a processing method in which different isolating layer protectors are used for sending and receiving fault direction information through GOOSE messages according to the relation between release and subscription and providing back-up protection for the transformer according to the logical judgment to together coordinately finish the back-up protection function of the transformer. The method of the invention can improve the reliability of relay protection of the digital substation and is beneficial to further development of the digital substation.

The invention discloses a method and a device for monitoring arrester resistance current by introducing unconventional PT. Firstly, the monitoring device accesses sampled value (SV) messages of merging units (MU), decodes the SV messages, detects the time of zero crossing point of busbar voltage, calculates the channel delay accurately by relying on an external synchronous clock, and restores sinusoidal waveform of the busbar voltage accurately. Secondly, the monitoring device collects leakage current sensor information mounted on a grounding wire of an arrester, and decomposes the leakage current of the arrester into resistance current and capacity current. Thirdly, the monitoring device determines the operation condition of the arrester based on the change rate of the resistance current and the ratio of the resistance current value in the arrester leakage current. According to the method and the device for monitoring arrester resistance current, the problem that some online monitoring devices cannot introduce busbar voltage signals for calculating the arrester resistance current when the busbar voltage is digital signals in intelligent substations or digital substations is solved effectively, defects of early aging, insulation hidden dangers and the like of arresters can be found earlier, and application prospect in the market is broad.

The invention provides a digital substation whole-substation power quality on-line monitoring device comprising a signal receiving module, a general message parsing module, a power quality analyzing and processing module and a signal output module. The signal receiving module is used for receiving a power quality signal of a digital substation, stamping a time mark on the power quality signal and sending the power quality signal to the general message parsing module. The general message parsing module is used for parsing the power quality signal sent by the signal receiving module and sending the parsed power quality signal to the power quality analyzing and processing module. The power quality analyzing and processing module is used for receiving and analyzing the parsed power quality signal sent by the general message parsing module to obtain an analysis result. The signal output module is used for outputting the analysis result obtained from the power quality analyzing and processing module. With the digital substation whole-substation power quality on-line monitoring device of the invention, the power quality operation condition in the digital substation can be monitored and pre-warned in real time so that whole-substation power quality monitoring, alarming and comprehensive-evaluation can be completed.

The invention relates to the field of intelligent substation operating maintenance, in particular to a method for automatic examination of wiring correctness of an intelligent substation SCD configuration file virtual terminator. The method is suitable for digital substations and intelligent substations adopting the IEC 61850 standard. According to the method, various main-wiring-form intelligent station relay protection associated equipment virtual terminator wiring model bases and a virtual terminator standard template file are generated, and an SCD file to be examined is compared with the virtual terminator standard template file, so that whether wiring of the virtual terminator of a device to be examined is correct and complete is automatically judged. High manual operation workload and errors are avoided, and working efficiency is improved greatly.

The present invention relates to a method and device for generating an engineering topology of a digital substation. The method may include: generating, by a single line diagram generation module, a single line diagram of the digital substation based on input information regarding a plurality of substation component devices and connection relations therebetween; converting, by a topology conversion module, the single line diagram of the digital substation into an engineering topology conforming to international standards by use of conversion conditions stored in a topology component management module; verifying, by a topology verification module, whether the engineering topology is suitable for the digital substation based on the international standards; and generating, by an international standard file generation module, a single line diagram engineering file of the digital substation as a system specification description (SSS) by use of the verified engineering topology.

The invention relates to a configuration method for a database of a communication device in a digital substation. The configuration method comprises the following steps: forming an independent middle text, namely, a rule file, according to an IEC61850 standard and a mapping rule for the database of the communication device; automatically generating data of a measuring point according to an engineering requirement and inputting the data of the measuring point into the database of the communication device, for an imported ICD (Interface Control Document) of the device during the configuration process of the communication device; and configuring through configuration software. According to the configuration method, the middle text is supplied to the database of the communication device and the database of the communication device is statically generated according to the corresponding rule in the middle text after the configuration software is imported into the ICD of an IEC61850 device, wherein the rule in the middle text comprises three parts: a basic classifying rule, a prior rule and a shielding rule. According to the configuration method, the database for the measuring point can be flexibly and automatically generated for the imported ICD of the device according to the engineering requirement, so that the process of manually selecting the point by an engineering configuring person is omitted, the possibility of configuration fault is eliminated and the efficiency of engineering configuration is increased.

The invention discloses a time comparing device for a digital substation, comprising a core processing module and a PTP event processing module, an Ethernet communication interface module, a serial communication interface module and a discrete input / output module, which communicate with the core processing module. The device is characterized in that the core processing module comprises a central processing unit (CPU) AT91RM9200 which forms a basic embedded system with a synchronous dynamic random access memory, parallel flash, a real-time clock, a watchdog timer and a JTAG debug port, which are connected with the CPU AT91RM9200. The PTP event processing module, an Ethernet transceiver DP83640 and protocol stack software / hardware supporting the IEEE1588 standard are combined to realize thehigh-precision time comparing function of the substation device. The device realizes the high-precision time comparing supporting the IEEE1588 standard and the time synchronization requirement of thedigital substation device.

The invention relates to a detection method of digital substation PT secondary nuclear phase checking, which comprises nuclear phase checking in the same voltage class and nuclear phase checking in different voltage classes; for the nuclear phase checking in the same voltage class, a power transformer or a digital fault recorder are utilized to check nuclear phases at consolidators in the same voltage class; for the nuclear phase checking in different voltage classes, nuclear phase is checked at a protecting panel of a transformer which is utilized to measure and display the angular differences and amplitude differences between the high voltage side and the medium voltage side and between the high voltage side and the low voltage side after buses in different voltage classes are electrified, and the nuclear phase checking of the medium voltage side and the low voltage side thereof can be realized by step (1), therefore, the nuclear phase checking at the time of the whole digital substation being started can be completed. The invention can meet the detection requirement of digital substation PT secondary nuclear phase checking, and has the advantages of accurate detection and easy operation.

The invention discloses a universal testing interface, which is characterized in that the universal testing interface comprises an interface testing device, hardware, a plurality of functional interfaces and upper computer analyzing software, wherein the interface testing device is applied in a universal secondary device in a digital substation; the hardware comprises a GOOSE module CPU plate, a sampling value module CPU plate and a sampling treatment FPGA plate, which are connected through a backplane bus; a plurality of functional interfaces comprise a conventional electric quantity interface, 9-1, 9-2, FT3 and GOOS communication interfaces, an Ethernet interface, a GPS electric pulse timing interface and an optical synchronization interface; the upper computer analyzing software is matched with the device; upper computer debugging software comprises 9-1, 9-2, FT3 and GOOS testing modules, sampling value input monitoring, message analysis and state sequence testing modules. The invention has the advantages that the universal testing interface can be used for testing, maintenance and field debugging of secondary devices with digital interfaces such as a protection testing device, a merging unit, an intelligent unit and the like in the digital substation; and the universal testing interface can be flexibly and rapidly configured, and improve the field engineering debugging rate of the digital substation.

The invention provides an on-line monitoring and evaluating system and method for a digital electric energy meter, and belongs to the technical field of electric energy measurement and test. The on-line monitoring and evaluating system comprises a merging unit, a switcher, an RS485 concentrator, a far-end computer, a data transmission unit and a local computer. The digital electric energy meter in actual running is monitored on line for a long time, sensitive factors affecting measurement errors and reliability of the event recording function of the digital electric energy meter are found out, a state evaluation model of a digital electric energy measurement system is set up, and application of new electric energy measurement devices such as an electronic mutual inductor and the digital electric energy meter to the digital substation electric energy measurement system is promoted.

The invention discloses a dynamic checking method of intelligent substation IED (intelligent electronic device) model configuration correctness based on SCD (security coding device) files. The dynamic checking method is adaptable to a digital substation or an intelligent substation communicated under IEC61850. The dynamic checking method includes firstly extracting relative IED model information to be detected from the SCD files, then mapping the relative IED model information to be detected into MMS (multimedia messaging service) named variables, and storing the MMS named variables as a data file 1; then communicating with the IED to be detected in a client terminal mode, reading information of each layer of the IED to be detected online through ACSI (abstract communication service interface) model reading service, and storing the information as a data file 2; and finally comparing the model information of the data file 1 to that of the data file 2 to determine whether the model information is identical or not. The dynamic checking method has the advantages that downloaded CID (character identifier) files in the intelligent substation IED and the SCD file information are checked automatically to determine whether the information is identical or not.

The invention relates to a verifying unit of a digital substation pass electric energy meter. The primary side of a standard voltage transformator and the primary side of a high-voltage standard current transformator are respectively connected with the secondary side of a high-voltage testing transformer and a high-voltage booster, and the secondary sides of the standard voltage transformator and the high-voltage standard current transformator are connected with a single-phase standard electric energy meter; the secondary sides of the high-voltage booster and the high-voltage testing transformer are connected with a current sensor and a voltage sensor of an electronic transformator; the electronic transformator also comprises a primary converter unit and a merging unit; the current sensor and the voltage sensor are connected in parallel and connected to the primary converter unit; the primary converter unit is connected with the merging unit; the outlet of the merging unit is connected with a network electric energy meter; and the network electric energy meter and the single-phase standard electric energy meter are together connected to an electric energy error calculator. Due to the adoption of the invention, the error of the digital substation pass electric energy meter can be obtained without paying attention to the error of the merging unit of the electronic transformator and the error of the network electric energy meter; in addition, the magnitude of error of the digital substation pass electric energy meter can reach the nation standard.

The invention discloses a method for fault inversion and communication inversion of a digital substation based on the IEC (International Electrotechnical Commission) 61850 standard. At present, the digital substation based on the IEC61850 standard is basically internally provided with network data recording devices only taking charge of intercepting and storing original communication messages andnot having the function of communication inversion. In the invention, the method for fault inversion and communication inversion of the digital substation based on the IEC61850 standard comprises thefollowing steps of: analyzing Comtrade recording files generated by a digital fault recorder, and repeatedly transmitting the acquired data on each recording time point according to the recorded frequencies so as to realize the inversion of the fault data; and analyzing recorded files generated by the recording devices in the substation, and reducing and transmitting the files according to the recording time corresponding sequence of each data in the recorded files so as to realize the inversion of the communication process. The invention realizes the fault inversion and the communication inversion by a simple manner, and the combination of the fault inversion and the communication inversion provides an excellent auxiliary effect for substation workers to find out the reason of faults.