Abstract: The present invention provides a polypropylene cable protective layer and a preparation method thereof. The polypropylene cable protective layer sequentially includes a dielectric layer, a buffer layer and an insulating layer from the inside to the outside, and the thickness of the dielectric layer accounts for 5%˜12% of the thickness of the polypropylene cable protective layer; the thickness of the buffer layer accounts for 17%˜25% of the thickness of the polypropylene cable protective layer; the dielectric layer, the buffer layer and the insulating layer are respectively obtained by the wrapping of a polypropylene film A, a polypropylene film B and a polypropylene film C. The polypropylene cable protective layer of the present invention forms a dielectric gradient, and realizes the improvement of the insulation strength and voltage level of the power cable, and the increase of the transmission capability.

Abstract: A non-transitory computer readable medium with instructions stored thereon, the instructions executable by one or more processors for calculating base swirl in a gas turbine; and calculating relative swirl in the gas turbine. Also, a method for gas turbine maintenance, comprising identifying a combustor in need of repair or replacement within a gas turbine; and repairing or replacing the combustor; wherein said identifying comprises calculating base swirl of the gas turbine and calculating relative swirl of the gas turbine in order to associate a gas path from a thermocouple to the combustor in need of repair or replacement.

Abstract: A trusted anonymous voting method includes: performing a hash operation on original voting content to obtain a hash output including a commitment value cvi; blinding the commitment value cvi based on information of other voters to obtain commitment value tuples {tilde over (c)} and {tilde over (x)}; signing the commitment value tuple {tilde over (c)} by using an ESDSA to obtain a signature tuple {tilde over (s)}; and establishing a vote tuple ({tilde over (c)}, {tilde over (s)}, {tilde over (d)}) based on the commitment value tuple {tilde over (c)}, the signature tuple {tilde over (s)} and a signature tuple {acute over (d)} of other voters, and uploading the vote tuple (?, ?, {acute over (d)}) and the commitment value tuple {tilde over (x)} to the blockchain, where signature tuple {tilde over (d)} is generated in a case that other voters verify the signature tuple {tilde over (s)} and the signature tuple {tilde over (s)} passes the verification, and the commitment value tuple {tilde over (x)} is used to decry

Abstract: A timestamp generation method and apparatus, and an electronic device and a storage medium, which are used for solving the technical problem of recorded information being easily leaked because a trusted third party is usually needed as a timestamp authority for recording in a traditional trusted timestamp generation method. In the present invention, the method comprises: acquiring a file record; calculating a hash value of the file record; sending the hash value to a random issuer, and receiving a signature result returned by the random issuer, wherein the signature result is generated after the random issuer signs the hash value and a receiving time, and the receiving time is the time when the random issuer receives the hash value; and storing the signature result in a blockchain as a timestamp of the file record.

Abstract: Disclosed are an emergency control method and system based on source-load-storage regulation and cutback. According to the method, output power of power generating sources is regulated according to a power regulating quantity and a frequency regulation requirement, an output power compensation and output frequency of each power generating source are maintained within permissible ranges, so that a balance between power supply and demand of a power distribution network is maintained; and standby energy-storage power stations are used to make up a power gap, and an external power supply system is used to assist in making up a power deficiency, so that large load disturbance can be handled make up the power gap.

Abstract: Disclosed are a voltage source converter based high voltage direct current (VSC-HVDC) high-frequency resonance suppression method, system, and device. The method includes: when an effective value of an actually input alternating current (AC) voltage is reduced from a normal value to meet a preset condition, making the virtual electrical quantity completely equal to the actual electrical quantity, and performing full real-time tracking for the actual electrical quantity to improve dynamic characteristics of a power system at the moment of a fault; and after performing the full tracking for a period of time, if the effective value of the actual AC voltage is less than a preset threshold, performing adaptive tracking until the actual electrical quantity recovers to a stable value. The present disclosure can reduce a risk of high-frequency resonance of a VSC-HVDC, avoid deteriorating dynamic characteristics of the VSC-HVDC, and improve safety of fault ride-through of the VSC-HVDC.

Abstract: A blockchain-based interconnected vehicle authentication system and method. During message signature process, a registered vehicle verifies a driver, and broadcasts a message. During a message verification process, a registered vehicle checks the message authentication code from a received message based on the system key, and verifies the message based on a public key of a sender of the message. During a block generation and verification process, the first local trust authority broadcasts a block, and share the block to the second local trust authorities after the block passes verification. During a block confirmation process, second local trust authority makes confirmation with regard to the block and send a confirmation result to the root trust authority, to allow the root trust authority link the block into the blockchain in response to receiving confirmation results from second local trust authorities in a quantity exceeding a predetermined number.

Abstract: A method for identifying a dominant overvoltage of a high-proportion new energy power system includes the following operations. A voltage amplitude of a new energy terminal and a voltage amplitude of an alternating-current (AC) bus at any moment after faults of the new energy terminal and the AC bus are cleared, are determined. An overvoltage limit ratio is determined according to a ratio of the voltage amplitude of the new energy terminal to the voltage amplitude of the AC bus. A critical overvoltage limit ratio is determined. A maximum new energy terminal voltage value and a maximum AC bus voltage value bearable for the new energy terminal and the AC bus are determined respectively. Identification of a dominant voltage safety constraint is performed and an identification result is determined.

Abstract: A low-voltage user demand response interaction apparatus and an operation method therefor. The apparatus comprises an electrical loop, a mechanical switch, a protection module, a data collection module, a control processor, a power supply module, a communication module, a load identification module, a blockchain module and a demand response module, wherein the mechanical switch is connected to the electrical loop; the protection module is connected to the mechanical switch; the control processor is connected to the protection module; the load identification module, the blockchain module and the demand response module are respectively connected to the control processor; the data collection module is connected to the electrical loop, and transmits data to the control processor; and the communication module and the power supply module are respectively connected to the control processor.

Abstract: Provided is a monitoring device for the settlement of a transmission tower. The monitoring device includes a laser ranging sensor, an acceleration sensor, a central processing module, a battery, and a fixing plate. The laser ranging sensor is configured to measure the distance between the installation position of the monitoring device and the ground. The acceleration sensor is configured to measure the inclination angle of a tower leg. The central processing module is configured to process measurement data of the laser ranging sensor and the acceleration sensor. The battery is configured to supply power to the laser ranging sensor, the acceleration sensor, and the central processing module. The fixing plate is configured to fix the monitoring device to the tower leg of the transmission tower. A method for monitoring a settlement of a transmission tower is further provided.

Abstract: Disclosed are a coordinated control method and system for active support of a new energy power station containing a voltage-controlled source. The method includes: obtaining a working mode and a controlled target value of an external characteristic of a new energy power station, and setting internal parameters of a voltage-controlled source and a current-controlled source in the new energy power station; monitoring a power output state of a controlled unit of a voltage source, and calculating a regulation margin of the voltage source; setting power, inertia, and an objective function and a constraint of multi-source coordinated control of primary frequency modulation (FM)/voltage regulation for the new energy power station, and obtaining controlled allocation logic of a current source based on the objective function and the constraint of the multi-source coordinated control; and setting secondary control logic of each controlled unit and its allocation priority strategy.

Abstract: Disclosed are a three-dimensional wildfire monitoring and control system and method for a power transmission corridor. The system includes: a wildfire-induced trip risk assessment module, for assessing, when a wildfire is detected in a power transmission corridor, a wildfire-induced trip risk in real time so as to determine whether to issue a wildfire warning; an online wildfire monitoring device layout planning module, for generating an online wildfire monitoring device layout plan for transmission lines based on the wildfire-induced trip risk, a blind spot of satellite monitoring and importance levels of the transmission lines; and a three-dimensional power transmission corridor wildfire monitoring and warning module, adopting multi-source satellites and drones, and realizing three-dimensional wildfire monitoring of the power transmission corridor by monitoring through online wildfire monitoring devices provided according to the layout plan, the multi-source satellites and the drones.

Abstract: The present invention provides a polypropylene cable protective layer and a preparation method thereof. The polypropylene cable protective layer sequentially includes a dielectric layer, a buffer layer and an insulating layer from the inside to the outside, and the thickness of the dielectric layer accounts for 5%˜12% of the thickness of the polypropylene cable protective layer; the thickness of the buffer layer accounts for 17%˜25% of the thickness of the polypropylene cable protective layer; the dielectric layer, the buffer layer and the insulating layer are respectively obtained by the wrapping of a polypropylene film A, a polypropylene film B and a polypropylene film C. The polypropylene cable protective layer of the present invention forms a dielectric gradient, and realizes the improvement of the insulation strength and voltage level of the power cable, and the increase of the transmission capability.

Abstract: The present invention provides a super-hydrophobic anti-pollution flashover coating with hydrophobicity transference, which is prepared from the following raw materials: a silicone resin, an organic solvent, silicon oxide, a flame retardant, a cross-linking agent, a coupling agent, a dispersing agent, a defoaming agent, a leveling agent, and a silicone resin curing agent. The present invention also provides a preparation method of the super-hydrophobic anti-pollution flashover coating with hydrophobicity transference.

Abstract: A method for controlling peak saving by wind power grid. The method includes: S1: evaluating dispatchability of a cluster virtual wind power unit; S2: developing a method for calculating a dispatchability index of the cluster virtual wind power unit; S3: analyzing a source-load peak-shaving resource strategy; and S4: distributing a control strategy for tie-line peak shaving. The present disclosure has the following beneficial effects: In the present disclosure, real-time dispatchability of wind power participating in real-time power balance is first analyzed, specific evaluation indexes and calculation methods are provided, and calculation examples are given for verification. Then, an optimized real-time dispatch strategy is provided based on demand-side response resources, and DC and AC tie-lines are coordinated for operation. The peak shaving control method for emergent source-grid coordination when a sending-end power grid is faulty can ensure normal operation.

Abstract: A device for loop closing and breaking of a power distribution grid based on decoupled voltage regulation is provided. The device comprises a voltage-regulation phase shifter, a control system, a voltage acquisition device and a loop closing switch. The voltage acquisition device acquires voltage signals on two sides of the loop closing switch performing a loop closing or breaking operation and transmits the voltage signals to the control system. The control system calculates a compensating voltage amplitude and phase-angle according to the voltage signals, and sends an instruction to the voltage-regulation phase shifter according to the compensating voltage amplitude and phase-angle. The voltage-regulation phase shifter outputs the compensating voltage amplitude and phase-angle according to the instruction from the control system, to compensate for a voltage difference between the two sides of the loop closing switch.

Abstract: Disclosed are a method and system for determining the installation position of a thyristor controlled phase shifter, a medium and a computing device. The installation position of a thyristor controlled phase shifter can be determined according to the variation of the voltage stability index of a power system before and after the thyristor controlled phase shifter is installed, thus providing technical support for the selection of the installation position of the thyristor controlled phase shifter in a power grid.

Abstract: A soundproof door system includes a chute; a door body, where a bottom of the door body is inserted into the chute and able to slide along the chute; a first roller disposed on the bottom of the door body and supported on a bottom wall of the chute; a first soundproof plate provided with a first end connected to the door body and a second end abutting against an inner wall of the chute; a second soundproof plate provided with a third end connected to the door body and a fourth end abutting against the inner wall of the chute; and the first end and the third end are respectively located on two sides of the door body, and the second end and the fourth end are respectively located on both sides of the door body.

Abstract: Lithium ion batteries and battery modules are disclosed. The lithium ion battery includes a housing where a positive electrode, a negative electrode, and an electrolyte are provided. Some of the areas of the housing are made from the fusible material. When the temperature in the housing exceeds a set threshold, the area, made from the fusible material, on the housing is communicated, where the electrolyte flows out to separate from the positive electrode and the negative electrode. Timely separation of the electrolyte in the single lithium ion battery is achieved when the temperature thereof rises abnormally, the electrolyte is effectively protected from being ignited or decomposed, the single lithium ion battery is protected from being ignited and exploded, and damages to the rest surrounding single lithium ion batteries caused by a chain reaction brought by the single lithium ion battery of which the temperature rises abnormally are avoided.

Abstract: A method and a device for controlling grid configuration of a flexible direct current electric power transmission system, and a computer-readable storage medium are provided. The active power reference value is modified based on the frequency deviation of the alternating current grid. The reactive power reference value is modified based on the voltage deviation of the alternating current grid. The outputted active power and the outputted reactive power are controlled based on the active power reference value and the reactive power reference value, respectively. The grid voltage is further configured and controlled through power control, so that the system is capable of self-synchronization, frequency regulation and voltage regulation. In addition, the virtual synchronous machine technology is introduced into control of the reactive power, so that the system can provide inertia support for the grid voltage amplitude.