53results 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.

The present invention provides a load controller for use in a hydrostatic transmission for a work vehicle that is free from control failure caused by deterioration of the constituent components, and that can be miniaturized and simplified in structure compared to conventional load controllers. In the work vehicle, power supplied from an engine (E) is branched to drive an implement system and a traveling system. A hydrostatic transmission (1) is provided in the traveling system. The hydrostatic transmission (1) connects, in an oil-hydraulic closed circuit, an oil-hydraulic pump (2) driven by the engine (E) and an oil-hydraulic motor (4) driven by the oil-hydraulic pump (2). The load controller is provided with a bypass oil line for bypassing an oil line that has high pressure during forward movement (3a) in the oil-hydraulic closed circuit to reach an oil line that has low pressure during forward movement (3b) or an oil tank (T); a first opening / closing valve for opening or closing the bypass oil line (8); and an opening / closing valve (9) controller that detects a load applied to the engine (E) while traveling during working and opens the first opening / closing valve (9) when the load exceeds a predetermined level.

The invention discloses an active power security correction method of considering coordination among multiple polymers. A correlation coordination relation between control functions among multiple polymer grids is researched in the aspect of active power security correction on the basis of forming observation point observation functions of the polymer grids. Selection of control nodes is carried out through the comprehensive sensitivity and output increasing nodes and output reducing nodes are determined; an active power security correction model of considering the control cost is built; whenactive power of a power transmission line among the polymer grids is overloaded, the power of an overload branch is quickly and effectively reduced and the overload is eliminated through coordinationof the observation point control functions at two ends of a power transmission section, and meanwhile, the condition that a normal branch and the corrected branch are not overloaded is ensured.

A system and method for controlling telephone voting in a digital mobile communication network that includes a plurality of mobile subscriber communication stations provides for automated, statistically-appropriate control of telephonic voting via such mobile stations. Using a polling server, a predetermined initial proportion of the mobile stations is authorized to concurrently transmit a vote by transmitting a voting authorization to the authorized mobile stations over a control channel from the polling server. A voting application stored in or associated with each mobile station monitors the control channel and enables transmission of a vote from a mobile station only after the authorization has been received by that mobile station. The invention thereby accommodates and assures the staggered transmission of votes in a telephonic poll so as to avoid overloading of the network.

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.

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.

Disclosed is a load controller for use in a hydrostatic transmission for a work vehicle. Power supplied from an engine is branched to drive an implement system and a traveling system. The hydrostatic transmission connects, in an oil-hydraulic closed circuit, an oil-hydraulic pump driven by the engine and an oil-hydraulic motor driven by the oil-hydraulic pump. The load controller includes a bypass oil line for bypassing an oil line that has high pressure during forward movement in the oil-hydraulic closed circuit to reach an oil line that has low pressure during forward movement or an oil tank; a first opening / closing valve for opening or closing the bypass oil line; and an opening / closing valve controller that detects a load applied to the engine while traveling during working and opens the first opening / closing valve when the load exceeds a predetermined level.

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 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 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.

A scroll compressor having a bypass is provided. The scroll compressor may include a casing, a discharge cover, a main frame, a first scroll supported by the main frame, and a second scroll that forms a suction chamber, an intermediate pressure chamber, and a discharge chamber together with the first scroll. The second scroll may include a bypass hole that communicates with the intermediate pressure chamber. The scroll compressor may also include a back pressure chamber assembly coupled to an upper portion of the second scroll by a fastening device and a bypass valve to open and close the bypass hole. The back pressure chamber assembly may include a discharge path by which the discharge chamber and the discharge space may communicate with each other and a bypass valve to open and close the bypass hole.

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 an overhead transmission line maximum temperature forecasting method based on an echo state network and belongs to the field of relay protection on power system transmission lines. The method comprises the steps of forecasting the maximum temperature difference deltaTmax(n) along the transmission line based on the echo state network, forecasting the temperature rise variation A (n) based on the echo state network, forecasting the temperature rise variation B (n) based on the echo state network, forecasting the local conductor temperature Tlocal(n) of a transformer substation by virtue of iteration according to the A (n) and the B (n) in combination with the environmental temperature data Ta acquired at the current moment, and adding the forecasted maximum temperature difference deltaTmax(n) along the line and the forecasted local conductor temperature Tlocal(n) to obtain the forecasted maximum temperature difference Tmax(n) along the line. According to the overhead transmission line maximum temperature forecasting method based on the echo state network, the potential current-carrying capability of the line is excavated as much as possible, the conductor temperature is pre-evaluated and the protection action time is adjusted adaptively, and therefore, more time is gained for scheduling and for the emergency control system to take measures to eliminate overload.

The invention provides an active distribution network optimization and reconstruction method. The method comprises the steps of obtaining new energy power generation prediction data and ultra-short-term load prediction data in the active distribution network within a period of time in the future; calculating the flow distribution of the active distribution network within the period of time in thefuture based on the new energy power generation prediction data and the ultra-short-term load prediction data to obtain the load balancing condition of a prediction feeder; judging whether the switching power of the prediction feeder is out of the limit or not based on the load balancing condition of the prediction feeder; carrying out network topology analysis on the out-of-limit feeder to obtainpossible network reconstruction schemes of the out-of-limit feeder; carrying out optimization analysis on the possible network reconstruction schemes; and selecting an optimal network reconstructionscheme based on the analysis result, and obtaining a reconstructed switch operation sequence and index comparison before and after the reconstruction. The active distribution network optimization andreconstruction method adjusts the network structure by using switch optimization and combination operations, realizes power coordinated control between feeders by load transfer under certain constraints, establishes a network reconstruction strategy, eliminates feeder overload and improves the distributed generation absorption ability.

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.

Disclosed is a differential microphone pre-amplifier circuit (120) for providing an amplified differential signal at a first (A) and a second (B) output terminal of the microphone pre- amplifier (120), including a first voltage controlled current generator (101), a second voltage controlled current generator (102) and a third voltage controlled current generator (103) all being configured to receive, amplify and convert a voltage signal generated by an associated microphone (110) to a current signal output.

The invention provides a power distribution network anti-error optimization method. The power distribution network anti-error optimization method is characterized by comprising the following steps: 1, dividing a power distribution network topological system into a plurality of independent units according to a current running state, wherein each unit is provided with only one off switch and the number of the units is equal to the number of switches with off states; 2, performing real number encoding on the on-off state of each unit by a switch exchange algorithm, and connecting all the units into a chromosome; and 3, through a set objective function and set constraints, calculating the network by a chaos genetic algorithm so as to obtain an optimal solution. The invention has the advantages as follows: the power distribution network anti-error optimization method has certain theoretical study value and certain practical value; on the premise of meeting security constraints, the running way of a distributing line is changed by a switch operating method and the like, so that branch circuit overload and voltage out-of-limit are eliminated, feeder load is balanced and network loss is minimum; and the power distribution network anti-error optimization method has an obvious advantage in network loss improvement and convergence rate and is more suitable for on-site real-time application.

To realize a highly reliable clutch mechanism and safe and sure in change-over operation with a simple configuration by eliminating overloading on a level driving means which is caused by defective engagement in a washing machine provided with an engagement clutch mechanism with the laver driving means such as a geared motor or a solenoid as a driving source. The machine is provided with the lever driving means for operating a clutch lever which vertically slides the slide member for changing-over the transmission of rotation by the driving motor to a dehydrating shaft or a washing shaft by vertical sliding. The clutch lever is connected to the lever driving means with an intermediary member having a spring structure part. Then the level driving means is not overloaded since the spring structure part is extended even the slide member does not move by a prescribed stroke so that a problem of breakage due to a abnormal heating is eliminated.

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.

The invention provides a power grid active power safety correction method and device, electronic equipment and a storage medium. The power grid active safety correction method comprises the following steps: when a target line is overloaded, inputting state information in a power grid into a trained power grid active safety correction enhancement model, and determining a target generator set needing output adjustment in the power grid; and based on the target sensitivity of the overloaded target line to the target generator set, calculating the target output adjusting quantity of the target generator set. When multi-line overload is processed, the output of the generator set can be adjusted on the basis of the current operation state information of the power grid and the target sensitivity of the overload line to the generator set and the calculated target output adjusting quantity of the generator set, the line overload is efficiently eliminated, and the output of the generator set is improved. And the elimination effect of the load flow distribution condition and the output regulating quantity of the current power grid on the line overload is comprehensively considered.

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 disclosed data transmission method for high-speed down grouping access business comprises: RNC data-process unit notifies the overload information to a MAC-d entity; the latter controls flow rate according to received information. This invention can release overload efficiently, ensures network circulation and system normal running.

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.