52results about How to "Eliminate overload" patented technology

A dynamic reconstruction method considering distributed power supply and soft switch access for a power distribution network comprises the steps of building a source-load stochastic model, and performing stochastic power flow analysis on the power distribution network, wherein source-load stochastic model comprises a wind power generation system stochastic model, a solar photovoltaic power generation system stochastic model and a load stochastic model, and the stochastic power flow analysis of the power distribution network is based on a cumulant method; building an intelligent soft switch running model and a dynamic network reconstruction model, wherein the intelligent soft switch running model is expressed by capacity constraint of an intelligent soft switch converter, and the dynamic network reconstruction mathematical model comprises a target function and a constraint condition; and solving the built models by employing a genetic algorithm. The network reconstruction problem of thepower distribution network containing a distributed power supply and an intelligent soft switch is solved, a load among feeders of the power distribution network is balanced, the integral power flowdistribution of the system is improved, the overload is eliminated, the voltage level is improved, the electric energy quality and the power supply reliability are improved, the network loss is effectively reduced, and the running economy of the power distribution network is improved.

A multi-cable suspended lift with tail cable for balancing is composed of drive drum, overhead pulley set for bearing all load of suspending steel cable and lift container, driving steel cable, lift contain and tail cable. The active load of driving steel cable and lift container is borne by drive drum.

A hypoid gear device is provided with a backlash eliminating unit arranged between a driven wheel and a driving pinion to be meshed with the driven wheel. The backlash eliminating unit includes a driven pinion mounted on the same shaft as that of the driving pinion so as to be meshed with the driven wheel, and an elastic member urging the driven pinion on the same shaft of the driving pinion in the direction reverse thereto.

An accessory towing apparatus that connects a towing vehicle to a gooseneck-type trailer. The accessory towing apparatus includes a chassis framework assembly mounted on an axle having two ground engaging wheels. The chassis assembly includes three linkage arms, which are attached to and extend from the framework. The ends of the three linkage arms are designed to engage and couple with three brackets attached to the main frame of the towing vehicle. When the respective coupling mechanism of the three linkage arms are each engaged, they are substantially parallel to one another and pivot about a substantially common axis. An automatic alignment and attachment system may also be included to greatly simplify the attachment process of the gooseneck-type trailer to the towing vehicle.

An accessory towing apparatus that connects a towing vehicle to a gooseneck type trailer. The accessory towing apparatus includes a chassis assembly mounted on an axle having two ground engaging wheels. The chassis assembly includes two linkage arms, which are attached to and extend from the axle. The ends of the two linkage arms are designed to engage two brackets attached to the main frame of the towing vehicle. The linkage arms may further include a pivot point near the axle attachment point that permits the arms to pivot and spread away from one another in order to facilitate the engagement of the linkage arms in their respective brackets. A novel clamping lever system may also be utilized to secure the two linkage arms into their respective brackets. An automatic alignment and attachment system may also be included to greatly simplify the attachment process of the gooseneck type trailer to the towing vehicle.

The invention discloses a power distribution network congestion management method based on a technical virtual power plant, and the method comprises the following steps: building a VPP economic dispatching model taking the maximum VPP profit as an optimization target according to original data, and solving the model to obtain a dispatching scheme of each aggregation unit; constructing a power flowcalculation optimization model, obtaining the voltage and phase angle of each node of the power distribution network, calculating the power flow of each line, and judging whether the power flow of each line exceeds the limit; and if out-of-limit occurs, establishing a VPP security correction optimization model by taking the minimum adjustment node number and the minimum system adjustment amount as optimization objectives, and converting a multi-objective optimization problem into a single-objective optimization problem with priorities by introducing weights and maximum values to obtain the correction amount of each aggregation unit. The method can effectively eliminate the line blocking problem.

The invention discloses an auxiliary decision-making calculation method for eliminating overload of near-zone equipment of a unified power flower controller (UPFC). A UPFC module and a network equation are alternatively iterated by power flow calculation on UPFC power flow control, an active power flow setting value of a series connection end of the UPFC is automatically adjusted according to a relative relation between control adjustment of active power flow of the series connection end in iteration and overload quantity of a controlled component when a controlled voltage source of the seriesend is not limited, the UPFC power flow is finally controlled within an adjustable range, and the static unsafety of the near-zone equipment of the UPFC is eliminated. By the auxiliary decision-making calculation method, a control strategy of the UPFC can be rapidly calculated on the premise that the effectiveness of eliminating the overload of the controlled component by UPFC power flow controlis ensured, the problem that an injection quantity perturbation method used for calculation of traditional static safety auxiliary decision making is not suitable for a strong non-linear controlled component such as the UPFC is solved, direct perturbation of a UPFC control target is also prevented, and the power flow calculation is short in time.

This invention provides a duo-two leading type drum brake device which simplifies a drum brake structure as well as improves a transmission efficiency of a application force from a shoe actuator to brake shoes. A pivot lever 60 has an intermediate portion pivotally supported on the brake shoes 40. A shoe-actuator 20 is positioned adjacent to the first anchors 30, 30 and being disposed between the ends 60a, 50a of the pivot lever 60 and the other brake shoe 50. A strut 70 is positioned between and functionally engaged with the other ends 60b, 50b of the pivot lever 60 and the other brake shoe 50. An application force of the shoe actuator 20 is transmitted to the brake shoe 40 via a pivot section of the pivot lever 70 and transmitted to the other brake shoe 50 directly from the shoe-actuator 20 and indirectly via the strut 70.

The invention relates to a vehicle service brake and parking brake interlocking device and a control method thereof. The vehicle service brake and parking brake interlocking device comprises a service brake circuit, a load sensing proportion valve, a two-way check valve, a service brake chamber and a spring brake chamber, wherein the service brake circuit is connected to the load sensing proportion valve, the load sensing proportion valve is connected with the two-way check valve through a first pipeline, the two-way check valve is connected to the spring brake chamber, and the load sensing proportion valve is connected with the service brake chamber through a second pipeline. Regardless of any operation mode of a driver, a service brake device and a parking brake device work alternatively, brake overload caused by misoperation of the driver is eliminated, performance of brakes is improved, and the service life of the brakes is prolonged.

The invention discloses an adaptive equipment overload emergency control method based on automatic measure sensitivity identification and belongs to the electric power system safety emergency control technology field. For equipment overload emergency control causing no power grid splitting, e.g., single break or same-station parallel equipment total break, when equipment overload is determined for the first time, equipment overload emergency control measure combinations are calculated according to a measure sensitivity initial value, power grid control is carried out, integrated measure sensitivity is reckoned according to the control effect, the integrated measure sensitivity is utilized to update sensitivity of other measures of a station to which a recently-applied measure is accessed, the equipment overload emergency control measure combinations are calculated, through reckoning sensitivity-calculation control measure iteration, equipment overload is eliminated. The method is advantaged in that control precision, timeliness and reliability are comprehensively guaranteed.

The invention discloses a looped network control cabinet. The looped network control cabinet comprises an industrial computer, a PLC controller and a plurality of interconnection switches. The invention also discloses a power distribution network control system for controlling a power distribution network system, the power distribution network system comprises a plurality of transformers, each transformer comprises a plurality of leading-out loads, the leading-out loads comprise adjustable leading-out loads and unadjustable leading-out loads, and the power distribution network control system comprises a plurality of transformer measuring instruments, a plurality of load switches and the looped network control cabinet. The invention also discloses a power distribution network control method. According to the looped network control cabinet disclosed by the invention, electrical parameter data of the transformers are received and processed by the industrial computer, and transfer control for the adjustable leading-out loads is intelligently realized in combination with the PLC controller and the interconnection switches. According to the power distribution network control system and the power distribution network control method, the electrical parameter data of the transformers measured by the transformer measuring instruments are received by the industrial computer, the overload conditions of the transformers are judged, the interconnection switches and the load switches are controlled by the PLC controller, and the overload of the transformers is eliminated.

An embodiment of the invention discloses a precise load shedding method for eliminating element overload after a remote spare power automatic switching operation. The precise load shedding method is used for solving the technical problems that the existing detection element overload load shedding device can only eliminate overload through shedding load of home station, the sheddable load quantity of the home station is seriously insufficient when element overload quantity is large, and the centralized shedding of the load of a substation is not conducive to offering power supply guarantee according to the importance of user load orderly.

The invention discloses a constant volume method of an urban power grid multi-partition flexible interconnection converter station, which specifically comprises the following steps: firstly, proposing a definition of the maximum power supply capability of an interconnected partition 220kV power grid, and establishing an interconnected power grid power supply capability evaluation mathematical model; secondly, adopting the improved K-means clustering to obtain the typical load level of the interconnection partition, and improving the precision of solving the power supply capability by the successive approximation method; and finally, determining the active capacity of the converter station by taking the purposes of achieving the maximum power supply capacity of the interconnected partitions and eliminating the overload of partition elements as targets. The influence of the load proportion of an induction motor in a load model on the reactive capacity of the converter station is considered, and the reactive capacity of the converter station is determined with the purpose that the bus voltage recovers to the specified level after the transient fault occurs in the partition. The constant volume method can meet the requirements that an interconnected city power grid reaches the maximum power supply capacity and the reactive power requirements of induction motors with different proportions under transient faults.

The invention discloses a circuit overloading processing method used for a direct current transmission system. The circuit overloading processing method which is used for the direct current transmission system and is high in reliability and easy and convenient to use is obtained by building a direct current transmission system model equation and a circuit active power correlation coefficient. By means of the circuit overloading processing method, the tide after a network structure is changed can be rapidly obtained only through tide distribution of an electric system before the network structure is changed and the circuit active power correlation coefficient; when serious overloading occurs in the electric system, in order to prevent tripping, caused by long-time overloading, of a circuit, circuits capable of eliminating circuit overloading to the maximum degree can be rapidly determined to be closed through calculation with the circuit overloading processing method. The circuit overloading processing method can be used for guiding planning and constructing of the electric system and provides an effective tool for processing circuit overloading of the direct current transmission system; in addition, in practical operation, visual theoretical guidance can be given to scheduling, and the direct theoretical basis is provided for real-time scheduling.

According to an embodiment of the present invention, a backpack-type mobile base station system based on a TVWS and satellite backhaul comprises a mobile base station wirelessly matching, by a TVWS, any one of a backhaul donor and a backhaul bridge so as to perform an emergency disaster mobile communication service by means of a terminal. The mobile base station comprises: a backhaul wireless matching unit wirelessly matching, by a TVWS, any one of a backhaul donor and a backhaul bridge; a terminal wireless matching unit for wirelessly matching the terminal; and a base station signal processing unit for processing a signal of the mobile base station between the backhaul wireless matching unit and the terminal wireless matching unit. The backhaul donor, the backhaul bridge, and the mobile base station receive power from at least any one of a commercial power source, a battery, sunlight, wind power, and power equipment.