Abstract: The present invention relates to the technical field of power electronics converters and discloses a grid-forming energy storage converter on/off-grid switching control method and system, where the method includes the following steps: S1: using a single-loop power control strategy in an off-grid state when an on-grid relay of target energy storage drops out; S2: using a parallel virtual impedance loop-based power control strategy in a transient on-grid state when the on-grid relay of target energy storage pulls in; and S3: using a cascaded dual-loop power control strategy with a virtual admittance voltage loop and an inner current loop when a stable on-grid state is established. The present invention solves the problems of large current impact and unstable switching process state in the existing working strategy for on/off-grid switching in the prior art.

Abstract: A method for evaluating an aging state of a silicone rubber composite insulator includes: step 1: collecting samples from the silicone rubber composite insulator, and subjecting samples in a surface layer and a center layer successively to hydrophobicity, flexing resistance, hardness, color, and absorbance tests; step 2: determining relevant data of the samples in a natural evolution process according to the tests in step 1; step 3: subjecting the samples to thermo-oxidative aging; and after the thermo-oxidative aging is completed, subjecting the samples to a hardness test of artificial accelerated evolution, and calculating position coordinates (F1, F2) of the samples in an aging space; and step 4: classifying the samples in advance and solving an aging state centroid of each classified population, calculating a minimum aging distance based on the position coordinates in step 3, and evaluating the aging state of the silicone rubber composite insulator.

Abstract: A molecular probe-based safety prewarning and fault location system for an electrochemical energy storage station includes a molecular probe label, a camera, and a host. The present disclosure realizes real-time safety prewarning of a fault of an electrochemical energy storage device based on a color change of a gas sensing region of the molecular probe label, and locates an abnormal electrochemical energy storage device based on a position marker region of the molecular probe label or a position of the camera on a slide rail when the camera is facing the molecular probe label. Operation and maintenance personnel of an energy storage station can obtain a prewarning signal in time and take a corresponding safety measure. The molecular probe technology is a drive-free technology with advantages of high sensitivity, low costs, and anti-interference. It has important application value for operation safety of a large-scale energy storage station.

Abstract: Disclosed in the present application are a self-energy-taking hybrid direct-current circuit breaker and an application method therefor. In the self-energy-taking hybrid direct-current circuit breaker, a breaking branch is connected to a through-current branch in parallel, a first end of a grounding branch is connected to the breaking branch, and a second end of the grounding branch is grounded. When a direct-current system operates stably, the through-current branch conducts a steady-state running current of the direct-current system, and when the direct-current system breaks down, a self-energy-taking capacitor in the breaking branch assists a power electronic device in achieving the breaking of a fault current.

Abstract: A contribution identification method for noise at a boundary of an urban substation in the present disclosure includes the following steps: describing site elements and surrounding environmental elements of an urban substation; measuring and recording a background noise value at each boundary of the urban substation; determining an orientation of a specific sound source of the urban substation, and setting a corresponding measurement point at each boundary of the urban substation; obtaining a spectrum of each specific sound source; analyzing a contribution of each intra-substation sound source of the urban substation to noise at the boundary of the substation; analyzing a noise level of each sound source measurement point in the urban substation; recording measured data during noise measurement, and correcting a noise measurement result; and generating a test report.

Abstract: An operation control method suitable for a fire extinguishing system of an extra-high voltage converter station is provided. The method includes: after an upper computer control system receives a sound-light alarm signal, an alarm position signal, and a switch position dividing signal, starting a spray range prediction analysis subsystem for a fixed fire monitor; determining, by the spray range prediction analysis subsystem for the fixed fire monitor based on an external wind direction and an external wind speed, whether a range of a fire monitor effectively covers an entire area of a converter transformer; and if yes, automatically presetting a first fire monitor to which a first compressed air foam generation subsystem belongs and a second fire monitor to which a second compressed air foam generation subsystem belongs; or if no, replacing a fire monitor with a mobile fire-fighting robot to extinguish a fire.

Abstract: Provided are a method and device employing a smart contract to realize identity-based key management. The method comprises: running a smart contract, and executing a key management process, wherein the key management process comprises: when a key of a target user requires an update and the target user is not a supervised user, generating a master public key and a master private key pertaining to the target user; acquiring, from a blockchain, identity information of the target user; generating a first target private key according to the master public key and the master private key pertaining to the target user and the identity information of the target user; and replacing a current private key of the target user with the first target private key.

Abstract: A vertical thyristor switch for a controllable surge arrester includes an insulating sleeve and a vertical cylindrical switch core body encapsulated inside the insulating sleeve. The switch core body includes thyristor valve sections, a reactor, driving units, a voltage equalizing assembly section, a structural member and a connecting member; and after being connected to the driving units on one side of the thyristor valve sections, the thyristor valve sections are arranged, together with the voltage equalizing assembly section, in a space of a lower section of the structural member, an upper section of the structural member is provided with the reactor, and components inside the switch core body are electrically connected through the connecting member.

Abstract: A method for evaluating the mechanical state of a high-voltage shunt reactor based on vibration characteristics is disclosed, relating to the technical field of electrical equipment fault diagnosis. The method includes: based on historical state data and real-time vibration and noise signal data of the high-voltage shunt reactor and through an LSTM neural network time series prediction method, comparing deviation between predicted characteristic value and actual characteristic value, and determining whether the high-voltage shunt reactor has mechanical defects or failures. By using the historical state data and the real-time vibration and noise signal data of the high-voltage shunt reactor, an LSTM neural network time series prediction method, as well as comparison of the deviation between the predicted characteristic value and the actual characteristic value, etc., the evaluation of the mechanical state of the high-voltage shunt reactor is realized.

Abstract: A document classification method includes: obtaining a document; extracting document keywords and a document abstract from the document; determining, according to the document keywords and the document abstract, a first classification label of the document; receiving a second classification label of the document, the second classification label being determined according to the document keywords, the document abstract, and the first classification label; obtaining a classification efficiency value of the documents, the classification efficiency value indicating a confidence level of the second classification label; and determining the second classification label as a final classification label of the document if the classification efficiency value is greater than or equal to a first threshold. The document classification method described above may improve the speed of document classification by computer, thereby improving the efficiency of document classification.

Abstract: A method for predicting a day-ahead wind power of wind farms, comprising: constructing a raw data set based on a correlation between the to-be-predicted daily wind power, the numerical weather forecast meteorological feature and a historical daily wind power; obtaining a clustered data set and performing k-means clustering, obtaining a raw data set with cluster labels, and generating massive labeled scenes based on robust auxiliary classifier generative adversarial networks; determining the cluster label category of the to-be-predicted day based on the known historical daily wind power and numerical weather forecast meteorological feature, and screening out multiple scenes with high similarity to the to-be-predicted daily wind power based on the cluster label category; and obtaining the prediction results of the to-be-predicted daily wind power at a plurality of set times based on an average value, an upper limit value and a lower limit value of the to-be-predicted daily wind power.

Abstract: An operation control method suitable for a fire extinguishing system of an extra-high voltage converter station is provided. The method includes: after an upper computer control system receives a sound-light alarm signal, an alarm position signal, and a switch position dividing signal, starting a spray range prediction analysis subsystem for a fixed fire monitor; determining, by the spray range prediction analysis subsystem for the fixed fire monitor based on an external wind direction and an external wind speed, whether a range of a fire monitor effectively covers an entire area of a converter transformer; and if yes, automatically presetting a first fire monitor to which a first compressed air foam generation subsystem belongs and a second fire monitor to which a second compressed air foam generation subsystem belongs; or if no, replacing a fire monitor with a mobile fire-fighting robot to extinguish a fire.

Abstract: A multifunctional C4F7N/CO2 mixed gas preparation system is disclosed. The C4F7N heat exchanger is used to heat and vaporize C4F7N input through the C4F7N input port; the CO2 heat exchanger is used to heat and vaporize CO2 input through the CO2 input port; the C4F7N/CO2 mixing pipeline structure is used to mix the heated C4F7N and heated CO2, and the C4F7N/CO2 mixed gas output pipeline structure is used to output the C4F7N/CO2 mixed gas. The C4F7N/CO2 mixing pipeline structure comprises a C4F7N/CO2 dynamic gas preparation pipeline structure and a C4F7N/CO2 partial pressure mixing pipeline structure; the C4F7N/CO2 partial pressure mixing pipeline structure includes partial pressure mixing tanks for mixing the CO2 and the heated C4F7N of certain pressures; and a plurality of partial pressure mixing tanks are arranged in parallel. A multifunctional C4F7N/CO2 mixed gas preparation method is also disclosed.

Abstract: A biomimetic tower climbing robot and a tower climbing method thereof are provided. The robot mainly includes a main control body module and clamping and moving mechanism modules; two ends of the main control body module are connected to one clamping and moving mechanism module through an elastic universal joint respectively, two clamping and moving mechanism modules can alternately lock and unlock an anti-fall track of an iron tower, and the main control body module alternately pushes the clamping and moving mechanism module at its upper end upwards and pulls the clamping and moving mechanism module at its lower end upwards to achieve climbing of the robot along the anti-fall track.

Abstract: A biomimetic tower climbing robot and a tower climbing method thereof are provided. The robot mainly includes a main control body module and clamping and moving mechanism modules; two ends of the main control body module are connected to one clamping and moving mechanism module through an elastic universal joint respectively, two clamping and moving mechanism modules can alternately lock and unlock an anti-fall track of an iron tower, and the main control body module alternately pushes the clamping and moving mechanism module at its upper end upwards and pulls the clamping and moving mechanism module at its lower end upwards to achieve climbing of the robot along the anti-fall track.

Abstract: A monitoring system based on a digital converter station includes a first monitoring terminal deployed at a first-level monitoring side, a second monitoring terminal deployed at a second-level monitoring side, and a third monitoring terminal deployed at a third-level monitoring side; the monitoring terminal at each level includes a communication module, a human-machine interaction module, a device status monitoring module, a device alarm management module, a video fusion processing module, and a data transmission adjustment and control module.

Abstract: The present disclosure discloses a waterborne epoxy resin for an anti-corrosion coating, and a preparation method and use thereof. In the preparation method, a strongly-hydrophilic polyethylene glycol (PEG) branch is introduced into a molecular chain of epoxy resin to realize the self-emulsification function of epoxy resin. Moreover, due to the short molecular chain, a solid content can reach up to 66.7% under the action of PEG. In addition, the waterborne emulsion can be prepared without adding any additional alcohol-soluble solvents and other high-boiling-point organic solvents, and a production process and a product use process both are very environmentally friendly. The waterborne epoxy resin can be mixed with a waterborne ammonia curing agent to form a film for corrosion protection.

Abstract: A high-frequency transformer includes: an iron core, primary windings and secondary windings, wherein the iron core is of an integrated equilateral triangle structure, the primary windings and the secondary windings are uniformly wound around three sides of the iron core, and the primary windings and/or the secondary windings are symmetrically distributed on the three sides.

Abstract: The present disclosure provides a blockchain-based green power certification method, apparatus, and system, to pre-process obtained basic data to obtain proof-of-existence data, certify the proof-of-existence data from a production side and a consumption side by using a certification chain and a token chain respectively, and obtain a green power attribute certificate and a green power consumption label if the certification is passed; generate a unique digital identifier for the green power attribute certificate and the green power consumption label separately based on a non-fungible token (NFT), which realizes non-interchangeability, indivisibility, and other characteristics of the certificate and the identifier; and supervise and verify a certification process by using a chain of custody, and generate a corresponding unique blockchain identifier for the certification chain, the token chain, and the chain of custody separately through multi-chain interaction, so as to realize data interaction between blockcha

Abstract: Provided are a manned pole-climbing work platform and a pole-gripping mechanism thereof. The pole-gripping mechanism includes an arm and a distal pole-gripping mechanical hand. The distal pole-gripping mechanical hand includes a front jaw, a rear jaw, a forward-threaded rod, a reverse-threaded rod and a preloader. The front jaw and the rear jaw are articulated with the arm through pivots. The preloader is configured to drive the forward-threaded rod and the reverse-threaded rod to rotate synchronously. The forward-threaded rod and the front jaw are articulated with each other through a front thrust-nut composite pivot. The reverse-threaded rod and the rear jaw are articulated with each other through a rear thrust-nut composite pivot. The front jaw and the rear jaw are openable or closeable relative to each other.