The invention relates to a GOOSE message subscription recognizing method, and realizes recognizing subscribed GOOSE messages by adopting a FPGA+PHY hardware architecture The method comprises the following steps: step 1, downloading related configurations of the GOOSE messages to FPGA; step 2, comparing the received message type codes and MAC address characteristics with the configurations which are downloaded to the FPGA and recognizing the GOOSE messages; and step 3, further carrying out verification treatment on the GOOSE messages recognized in the step 2 to check out non-subscripted messages in the recognized GOOSE messages and abandoning the non-subscripted messages The GOOSE message subscription recognizing hardware implementation method provided by the invention completely depends on the reconfiguration of a hardware circuit to execute the required functions, analyzes processing data in parallel, realizes an MAC function and filters the GOOSE messages at an MAC layer; by further adopting a CRC tagged word method, the character strings are converted into single bytes, so the storage space is saved, the logical time sequence is optimized, the real-time capability is improved, and the recognition efficiency of the GOOSE messages is also improved

GOOSE message subscription recognizing method

The invention relates to a programmable device-based GOOSE message receiving storm suppression method. According to the method, a programmable device is added between a received message and a CPU; temporal logic is constructed in the programmable device to extract the CRC (Cyclic Redundancy Check) code of the current received message; the CRC codes of three GOOSE messages received recently are stored; if it is detected that the current CRC code is identical with anyone in the recorded CRC codes of the three GOOSE messages, the current message is a storm message and is not received; if the current CRC code is different from any of the three recorded CRC codes, it is considered that the current message is not a storm message, and is received and stored; and the CRC code of the current message, adopted as the latest received CRC code, is updated into the three recorded CRC codes. With the method of the invention adopted, the interference of storm messages on receiving equipment can be effectively suppressed, and the resource consumption of the CPU can be greatly reduced. The method has the advantages of simplicity in realization and obvious storm suppression effect.

Programmable device-based GOOSE message receiving storm suppression method

The invention discloses a link detection method for a process-level switch of an intelligent substation and a switch. The link detection method comprises the steps of firstly reading and storing configuration Ethernet port and link related information; then receiving an Ethernet packet sent by a merging unit or an intelligent terminal, and performing CRC verification and data length verification; directly discarding the Ethernet packet if the Ethernet packet is not verified; otherwise, performing classification on the Ethernet packet, and judging whether the Ethernet packet is an SV packet or a GOOSE packet; and if the Ethernet packet is parsed to be an SV packet or a GOOSE packet, performing frame format verification on the SV or GOOSE packet according to a corresponding standard packet frame format definition, and alarming if the SV or GOOSE packet is not verified; and otherwise, performing node legality verification, and alarming if the SV or GOOSE packet is not verified. The link detection method performs detection on the process-level link state in a layer-to-layer progressive mode, and prevents occurrence of a circumstance that the link state and data transmission are disordered and incorrect, and thus reliable running of process-level equipment is ensured.

Link detection method for process-level switch of intelligent substation and switch

The invention discloses a method for achieving communication between a microprocessor and a touch screen based on an MODBUS-RTU protocol, and the method comprises the steps that S1, the microprocessor collects the data detected by a sensor system; S2, the microprocessor transmits the data to the touch screen through the MODBUS-RTU protocol. The method enables the communication between the processor and the touch screen to be smoother in a transmission mode through a specific MODBUS-RTU transmission data frame. Meanwhile, because all data received by the microprocessor is converted into a transmission format needed by the MODBUS-RTU protocol, the method is enabled to be better in expansibility and transportability.

Method for achieving communication between microprocessor and touch screen based on MODBUS-RTU protocol

The invention discloses an analysis method for the maintenance state of a protective relaying device of an intelligent transformer station. An optical coupler transmits the obtained input amount of a maintenance pressure plate to a CPU and an FPGA simultaneously; after receiving the input amount, the CPU sets a TEST bit by combining a present GOOSE message, generates a new GOOSE message and sends the new GOOSE message to the FPGA; and after receiving the new GOOSE message, the FPGA determines whether data of the TEST bit in the GOOSE message accords with the input amount received by the FPGA itself, and does not send out the new GOOSE message unless the data of the TEST bit accords with the input amount received by the FPGA itself. Thus, the FPGA determines a redundancy generating manner again, so that the reliability in determining the state of the maintenance pressure plate can be improved, and probabilities of failure or misjudgment are reduced. In addition, it is not required to replace the original structure and configuration of the GOOSE message.

Analysis method for maintenance state of protective relaying device of intelligent transformer station

The invention discloses an SMV and GOOSE message filter method based on an FPGA, belongs to the technical field of power system automation. According to the method provided by the invention, after the FPGA receives a frame of SMW or GOOSE messages completely through an internal MAC, MAC address filter is carried out firstly; then APPID filter is carried out; then CRC check code filter is carried out; after passing through the processes, ASN.1 decoding is carried out to the messages; key fields of the messages are extracted; legality check is carried out; finally secure bandwidth filter is carried out; and the messages passing through all the filter items are sent to a CPU for follow-up processing. Through the method provided by the invention, the difficulty of testing SMV and GOOSE message network pressures in a power automation device is solved; the system efficiency is further improved; and the hardware cost is reduced.

SMV and GOOSE message filter method based on FPGA

The invention discloses a power grid security and stability control device and method for realizing man-machine interaction by utilizing an MODBUS communications protocol, and belongs to the technical fields of electrical power systems and automation thereof The device comprises a stability control function module and a man-machine interface module, wherein the stability control function module is used for achieving the function of power grid security and stability control, and the man-machine interface module is used for achieving all the functions of data display and data modification of a monitoring interface; the man-machine interface module is a touch screen supporting a serial port MODBUS communication protocol, the stability control function module and the touch screen are connected through RS485, and data transmission adopts a serial link MODBUS transmission mode The data transmission is realized through the three steps of initialization, data receiving and processing, and sending Compared with the prior art, the power grid security and stability control device, disclosed by the invention, overcomes the defects of the man-machine interface of a traditional stability control device, improves the aesthetic property and the operation convenience of the man-machine interface and effectively reduces the development cost and the maintenance cost

Power grid security and stability control device and method for realizing man-machine interaction by utilizing MODBUS communication protocol

The invention discloses a large-scale new energy base power grid subsynchronous oscillation control method and belongs to the field of power system automation. The method is characterized by, to begin with, collecting three-phase current and voltage of all lines at the high and low voltage sides of a substation or a new energy station, carrying out signal processing on each line and monitoring subsynchronous oscillation power phasor of each line; according to subsynchronous oscillation power characteristics of the high-voltage side line, determining whether to take a control measure, and calculating the sum of subsynchronous oscillation power phasors of all lines at the high-voltage side; and comparing contribution degree of each line at the low-voltage side to the high-voltage side subsynchronous oscillation amplitude, and determining whether to cut off the low-voltage side line, and if so, cut off the low-voltage side line according to the contribution degree. The method can make a decision only based on local information of the single substation or the new energy station, can realize subsynchronous oscillation monitoring in specific areas, can also realize hierarchical control of the whole grid based on wide-area information networking, and can realize flexible implementation according to practical engineering.

Large-scale new energy base power grid subsynchronous oscillation control method

With the construction of UHV grid and smart grid, the structure and scale of China's power grid has been greatly changed. So new requirements for frequency voltage emergency control device are presented. Architectures and features of the device is first introduced, followed by intelligent plug-management device is described, then the front end of correction algorithm based on DFT resampling is described. Additionally, the method for precise load shedding in smart substation, and the realization of standard human machine interface display and interactive method based on the C/S model are introduced. The engineering application of the device is introduced in the end.

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Development Of SSP510 Frequency Voltage Emergency Control Device

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SMV and GOOSE message filter method based on FPGA

Power grid security and stability control device and method for realizing man-machine interaction by utilizing MODBUS communication protocol

Large-scale new energy base power grid subsynchronous oscillation control method

Development Of SSP510 Frequency Voltage Emergency Control Device