97results about How to "Improve security and stability" patented technology

Provided is a low voltage microgrid group independent coordination control system, employing a layered control structure, i.e., an equipment layer, a grid control layer and a group control layer. A microgrid group controller receives a scheduling instruction of a group level energy management system; based on the safety and reliability of a control target of the microgrid group and sub microgrids, the microgrid group controller controls exchanging power between a microgrid group and a power distribution network and each sub microgrid, grid disconnection or grid connection of the microgrid group, and grid connection or grid disconnection of the sub microgrids, realizes interface control between the sub microgrids and the microgrid group, and meanwhile issues a control instruction to a grid level controller. The grid level controller works out optimal control strategies of distributed power supply, energy storage and load, and realizes stable operation and smooth transition among states of the sub microgrids in a grid connection state, and information communication with the microgrid group controller. A supply or energy storage local controller completes primary regulation of frequency and voltage of distributed power supply and energy storage; a load controller completes load grading control.

The invention discloses an energy storage power station battery compartment battery fault pre-judgment and positioning method, which comprises the steps of conducting single battery health degree analysis, battery performance change trend prediction and battery fault accurate pre-judgment and positioning, and obtaining battery operation parameter upper and lower limit thresholds and a battery health state in a current state by analyzing the single battery health degree; and predicting a battery performance change trend in a future period of time based on historical data in the past period of time, and pre-judging and positioning possible faults in the future in combination with upper and lower limit thresholds. Meanwhile, if it is detected that a certain or some properties of a single battery, a battery pack or a battery cluster may change suddenly in an extremely short time, possible faults in a short time can be predicted through a battery fault accurate pre-judgment and positioning function, and corresponding faults are positioned and identified through a fault expert database. Through comprehensive implementation of the method, the operation and maintenance technical support level and the system safety and stability level of the energy storage power station can be obviously improved.

The invention relates to the wireless network field and discloses a method for rapidly accessing to a wireless local area network and a mobile terminal thereof. By using the method for rapidly accessing to the wireless local area network, the mobile terminal can conveniently access to the wireless local area network. Simultaneously, network privacy information can be protected and network safety stabilization can be strengthened. The method for rapidly accessing to the wireless local area network of the invention comprises the following steps: shooting a barcode photo which stores wireless local area network information, wherein the wireless local area network information comprises a service set identifier (SSID) and a password; analyzing the wireless local area network information from the barcode photo; using the wireless local area network information to access to the wireless local area network.

To provide a cosmetic composition having excellent ultraviolet protection against both UVB and UVA, causing neither unpleasant whitening to the applied skin nor skin irritation, and ensuring good feeling on use and high safety and high stability without causing decomposition of the ingredients blended in the cosmetic material, such as organic ultraviolet absorber. A cosmetic composition obtained by using fine particulate titanium oxide and fine particulate zinc oxide each surface-treated with silica, alumina or alumina/silica and having a primary particle size of 0.01 to 0.2 mum in combination and blending titanium oxide and zinc oxide at a mass ratio of 1:4 to 2:3, wherein SPF is maintained as compared with the case where the mass ratio of titanium oxide to zinc oxide is 1:0, and when applied to a thickness of 10 mum, the whiteness W value measured using the CIE color specification system is 20 or less.

The invention relates to a power network model-based wind power field automatic voltage control method which comprises the following steps of: 1, reading original data and building a wind power field power network mathematical model; 2, reading a wind power field real-time running working condition and a voltage target value released by the power grid dispatching; 3, carrying out load flow calculation to obtain initial load flow distribution on the basis of the former two steps; 4, distributing and releasing the reactive power reference value of a wind driven generator according to a sensitivity ordering strategy; 5, distributing and issuing the reactive power reference value of a dynamic reactive compensation device according to the sequence; and 6, confirming and releasing the tapping point gear reference value of an on-load tap changing transformer according to a step-by step adjustment strategy. According to the power network model-based wind power field automatic voltage control method, the unified coordination control among the reactive power of the wind power field wind driven generator, the reactive power of the dynamic reactive compensation device and the tapping joint of the on load tap changing transformer can be realized.

The invention discloses a cloud control navigator system for reporting road conditions in real time. The system comprises a navigator which carries a positioning module, positions position information of a current vehicle through satellite navigation and transmits the position information to a base station; and the base station which is provided with a cloud road condition service system for receiving the real-time position information of the current vehicle, carrying out big data statistical analysis and transmitting road congestion conditions to the navigator. The navigator combines the received real-time road congestion conditions with an electronic map to form a real-time road condition map, gives a prompt to a car owner, and at the same time, analyzes a current vehicle speed and congestion conditions of a destination route set by the car owner and carries out route planning according to instruction conditions. The navigator is also provided with a query module, a speed measurement module, a sensing module, a prompt module and a communication module, and at the same time, also carries a voice operation system and a traditional button operation system, and a monitoring pick-up head capable of 360-degree rotation is also arranged in the vehicle. An automobile safety protection system can be improved.

The invention provides a maintenance risk based power equipment operation and maintenance schedule optimizing method. The method includes a step S1 of collecting history operation and maintenance data; a step S2 of establishing an equipment operation and maintenance schedule optimizing target model according to the history operation and maintenance data; a step S3 of setting constraint conditionsfor operation of the equipment operation and maintenance schedule optimizing target model; a step S4 of grouping prior operation and maintenance schedules and adopting a dynamic planning method for solving the equipment operation and maintenance schedule optimizing target model; a step S5 of comparing the minimal costs of operation and maintenance work of each group and taking the operation and maintenance work of the group with the minimum cost as the optimal schedule scheme and executing the scheme. According to the invention, the optimal operation and maintenance schedule plan can be obtained, so that the operation and maintenance scheduling efficiency is improved, the scheduling practicability is ensured, safety and stability of a power grid is enhanced and operation and maintenance cost is reduced.

The invention relates to an online evaluation system for secondary equipment of an intelligent substation. The system comprises a master-station evaluation level and a transformer substation evaluation level, wherein the master-station evaluation level comprises an evaluation master station, the transformer substation evaluation level comprises a plurality of evaluation sub-stations which are arranged in all transformer substations respectively and multiple evaluation objects, corresponding to the evaluation sub-stations, of the relevant secondary equipment, the evaluation sub-stations are in communication with the corresponding multiple evaluation objects respectively through three-in-one network interchangers and communication lines, so that the evaluation parameters of the evaluation objects are collected, and the master station is in communication with the evaluation sub-stations through communication networks respectively so as to obtain the evaluation results of the evaluation sub-stations. The online evaluation system for the secondary equipment of the intelligent substation has the advantages that due to the fact that the online monitoring function of a monitoring system in the intelligent secondary equipment in the intelligent substation is used, in this way, excessive maintenance can be avoided, the workload of maintenance personnel is reduced, maintenance cost is reduced, and evaluation accuracy is extremely high.

The invention discloses a peak regulating control system of wide area wind power in an electric power system, which comprises a system architecture of the peak regulating control system of wide area wind power unified in the whole network based on wide area measurement system (WAMS), a control signal selection of the peak regulating control system of wide area wind power, a control strategy of the peak regulating control system of wide area wind power and a controlling communication interfacing technology of the peak regulating control system of wide area wind power. The method belongs to the technical field of electric power system wide area control; a technical proposal of the invention can be used for solving the difficult problem that the electric system lacks the peak regulating control system of wide area wind power unified in the whole network; the constructed system is used as a new method of peak regulation when the peak regulating capacity of hydroelectric generating units and thermal power generating units is exhausted, can increase the peak regulating ability of grid and promote the security and stability level of the power grid.

The invention discloses a transient stability strongly-correlated power transmission section identification method for a power grid, and belongs to the technical field of power systems and automation thereof. Different regulation modes are determined based on a transient stability quantification theory for a power system, rules of changes of the transient stability limit of a section along with the power transmission power of another section in different regulation modes are calculated, and transient stability limit influence indexes between different sections are further calculated to identify transient stability strongly-correlated sections in the power grid. The method is favorable for power system scheduling and running staff to master the intrinsic running rules of the system and make a power grid scheduling and running control decision, and the safety, stability and automation level of the system are improved.

The invention discloses an electric power frequency modulation market transaction clearing and settlement method, device and system, and the method comprises the steps of optimizing a frequency modulation auxiliary service, electric energy and a standby auxiliary service based on the frequency modulation information, frequency modulation capacity demands and frequency modulation mileage demands declared by all market main bodies, and obtaining a day-ahead frequency modulation plan; clearing the frequency modulation auxiliary service to obtain a rolling frequency modulation plan based on the day-ahead frequency modulation plan and the frequency modulation information of rolling updating of the market main body participating in frequency modulation in the day-ahead frequency modulation plan;clearing the electric energy and the standby auxiliary service, and clearing the frequency modulation auxiliary service to obtain a real-time frequency modulation plan according to the real-time market demand and the frequency modulation information of rolling updating of the market main body participating in frequency modulation in the rolling frequency modulation plan; and settling frequency modulation income based on the real-time frequency modulation plan. Rolling frequency modulation is introduced so that the scheduling mechanism is enabled to properly adjust the day-ahead frequency modulation plan, the rolling frequency modulation plan can be generated, the real-time frequency modulation plan can be acquired based on the rolling frequency modulation plan, and safety and stability ofthe power grid can be enhanced.

The invention discloses a method for optimizing parameters of a low-voltage current-limiting controller of a weak receiving terminal power network direct-current transmission system. The method comprises the following steps: establishing a simulated data platform; setting a running mode and a fault disturbance set; establishing an optimized model object function by adopting a particle swarm optimization algorithm; initializing a particle swarm, an optimum position of each particle and an optimum position of the particle swarm; starting iteration and updating the position and speed of each particle; calculating fitness of each particle; updating an optimum position through which each particle passes and an optimum position through which the particle swarm passes; and repeating the steps to obtain a parameter optimization result. According to the method disclosed by the invention, the establishment of the simulated data platform enables the optimized model object function to be able to accurately reflect the influence of VDCOL control parameters on safe and stable characteristics of an AC-DC power network, so that the parameters optimized by the method disclosed by the invention can achieve a better control effect under the condition with different running modes, faults and disturbance of a weak receiving terminal power network, thereby improving restoration characteristics of an AC-DC system, and promoting the safety and reliability levels of the system.

The invention discloses a net frame integral installation device and a construction method thereof. The net frame integral installation device comprises a self-balancing lifting device, a temporary supporting seat and a temporary supporting frame for additionally adding rods in high altitude in a net frame joint. The construction method comprises the steps that (1) an original structure supportingseat of the net frame is installed; (2) the temporary supporting seat for additionally adding the rods in high altitude in the net frame joint is manufactured; (3) a net frame structure is assembled;(4) a temporary balance supporting seat and a main balance supporting seat are installed; (5) a hydraulic cylinder for lifting is installed; (6) the net frame is lifted; (7) the rods are additionallyadded in high altitude in the net frame; (8) the temporary supporting seat for additionally adding the rods in high altitude in the net frame joint is dissembled; (9) a self-balancing adjusting shoulder pole beam is dissembled; (10) the temporary balance supporting seat and the main balance supporting seat are disassembled; and (11) the temporary supporting frame is dissembled. According to the net frame integral installation device and the construction method thereof, self balancing is achieved between symmetrical force points on the temporary supporting frame in the lifting process, the center of a lifting device and the center of the temporary supporting frame are in the same lead line to ensure that the axis of the temporary supporting frame is stressed, the rods are accurately addedon the net frame, and the safety of lifting of the net frame and the accuracy of the construction are improved.

The invention discloses an imprisoned object classification management system, and the system comprises a data collection module, a criminal penalty level evaluation module, a comprehensive quality evaluation module, a cell counting module, a separate control module, and a report output module. The system enables an imprisoned object to be distributed to a cell at a corresponding protection level according to the criminal penalty level, achieves the centralized management of serious criminals, facilitates the centralized distribution of prison resources, improves the utilization efficiency of prison resources, and improves the management safety of a prison. The system carries out further division of the distribution of an imprisoned object at the same criminal penalty level according to a danger coefficient, enables the imprisoned objects with the similar comprehensive quality to be managed in a centralized manner, facilitates the avoiding of unstable factors (fight and oppression), caused by strength difference, in the cells, and improves the prison management discipline sense and stability.

Disclosed is a novel method for online identification of coherent clusters of an electric power system. The method comprises: first of all, a PMU measuring real-time power-angle locus information of a generator set after a fault occurs; then, performing normalization processing on the PMU measurement information to generate standard data; and finally, classifying the standard data by use of an improved support vector machine algorithm to obtain a final consistent cluster online identification result. By using the method provided by the invention, for all the operation modes and passably generated fault types of the electric power system, online real-time data measurement is carried out through the PMU, and the improved support vector machine algorithm is employed, such that the problems of large computational complexity, long calculating time, easily caused dimensionality disasters and the like by use of a conventional method are solved, and on the basis of accurate and rapid consistency cluster online identification, the safety and stability level of the electric power system is improved.

The invention discloses a quantitative evaluation index system of an ultrahigh voltage connection mode and a comprehensive evaluation method. The method comprises the following steps: constructing anAC-DC system model based on engineering parameters, so as to obtain running parameters of the AC-DC system model; obtaining flow distribution indexes and safety stability indexes based on the engineering parameters and the running parameters; performing level analysis to obtain each index weight in the flow distribution indexes and the safety stability indexes; drawing a sector radar map based oneach index weight of the flow distribution indexes and the safety stability indexes; extracting the characteristic quantity of each index of the flow distribution indexes and the safety stability indexes; forming an evaluation function to obtain an evaluation function value; and determining that the connection mode of connecting an ultrahigh-voltage DC system into an ultrahigh-voltage AC system ina corresponding ultrahigh-voltage AC-DC combined system is the optimal in case that the evaluation function value is the maximum. With the adoption of the system and the method, advantages and disadvantages of a DC receiving end connection mode can be effectively and comprehensively evaluated, and moreover, the safety and stability level of the AC system at the receiving end can be increased.

The invention discloses a method for the safety protection of the intelligent reporting system of a power system safety automatic device. The method comprises the system architecture of the intelligent reporting system based on power system safety automatic device; safety strategies of the intelligent reporting system; and the safety technology for data interaction between the intelligent reporting system and the external data. The invention belongs to the technical field of power system safety and stability control. The technical scheme of the invention is used to solve the difficulty that the power system lacks for the safety protection of the intelligent reporting system of the safety automatic device, the established system is used as the protection means of the intelligent reporting system and the safety and stability level of the grid is improved.

The invention provides a safety tower crane and an implementation method thereof. Tower body standard sections are detachably connected from bottom to top to form a tower body, a rotary structure comprises an inner ring and an outer ring which are rotationally connected, and one tower body standard section is sleeved with the inner ring; and a cargo boom and a balance arm are fixedly connected with the outer ring, and the cargo boom, the balance arm and the rotary structure form a whole. The crane further comprises a lifting device, and overall lifting is achieved through the lifting device. According to the safety tower crane, the mutual influences of tower crane section increase and decrease operation and cargo boom and balance arm lifting operation are effectively reduced, and the safety of the tower crane is improved.

The invention discloses a rollover prevention device for an electric pole. The rollover prevention device is installed on the electric pole and the ground, and comprises a stay wire, a detector and acontrol center. The detector is arranged on the ground. One end of the stay wire is connected with the top of the electric pole, and the other end of the stay wire is connected with the detector. Thedetector comprises a resistance wire, a wire winding roller, a power source, a digital current device, a controller and a wireless module; one end of the resistance wire is fixed, and the other end ofthe resistance wire is wound around the wire winding roller; the wire winding roller is installed on a rotating shaft, and a spring is arranged between the wire winding roller and the rotating shaft;the stay wire is connected with the resistance wire, and a loop is formed by the resistance wire, between the fixing end of the resistance wire and a wire outlet of the wire winding roller, the powersource and the digital current device; and a data port of the digital current device is connected with the controller, the controller is connected with the wireless module, and the control center isprovided with a wireless data module corresponding to the wireless module. The rollover prevention device can detect inclination of the electric pole in time and remind maintainers to correct, so thatrollover of the electric pole is effectively prevented, and the safety and stability of a power transmission network are improved.

The invention discloses a concealed safety monitoring device convenient to install. The device comprises a monitoring unit; one side of the monitoring unit is provided with a connecting mechanism; the connecting mechanism comprises a fixing plate; the fixing plate is located on the surface of one side of the monitoring unit; the surface of one side of the monitoring unit is provided with a wall body; the surface of one side of the wall body is provided with a first empty slot and a second empty slot; the inner side of the first empty slot is connected with a clamping rod; the surface of the top end of the clamping rod is fixedly connected with a moving rod; a third empty slot is formed in the moving rod; the inner side of the third empty slot is fixedly connected with a spring; the surface of the top end of the spring is fixedly connected with a fixing block; the two sides of the fixing block are fixedly connected with the first empty slot; one end of the clamping rod penetrates through the wall body and the fixing plate and located inside the fixing plate; the surface of the bottom end of the clamping rod is connected with a clamping block; the clamping block is located on the inner side of the fixing plate and connected with a clamping groove; and the inner side of the fixing plate is provided with a magnet. The concealed safety monitoring device convenient to install can conveniently fix the monitoring unit on a mounting surface and improve the safety and the stability of the monitoring unit; and meanwhile, the monitoring unit can be mounted at a high position which is not easy to perceive or pick according to needs, so that the monitoring unit is prevented from being damaged. The application range and the safety of the device are improved, and the monitoring unit can be suitable for more different environments.

The invention discloses a circulating cold compress device for orthopedic nursing, and particularly relates to the technical field of orthopedic nursing instruments. The circulating cold compress device comprises a base; a cold compress seat is attached to the top of the base; connecting plates are fixedly connected to two sides of the cold compress seat; connecting blocks are fixedly connected tothe bottoms of the connecting plates on the two sides; a threaded cap is embedded in one side of the connecting block on one side; a threaded column is in threaded connection with the interior of thethreaded cap; rotating shafts are fixedly connected to the two ends of the threaded column; bearings are arranged on the outer side walls of the rotating shafts in a sleeving mode; first fixing plates are embedded in the outer side walls of the bearings; and handles are fixedly connected to one ends of the rotating shafts. By arranging an upper air bag and a lower air bag, cold air in the upper air bag and the lower air bag can be circularly input through circulating refrigeration of a refrigerating machine; and compared with the prior art, the duration time needed by cold compress is met, and extrusion cold compress and fitting cold compress of different affected parts can be effectively adapted, so that the cold compress comfort is remarkably improved.