38 results about "Power reliability" patented technology

The invention discloses a microgrid running optimization system and method based on power and heat combined dispatching. Running restrains such as the output force characteristic, start, stop and climbing of a distributed type generator set and the charge and discharge characteristics of power and heat energy storage are comprehensively considered, a microgrid power and heat combined dispatching model containing a fan, a photovoltaic cell, a combined heat and power generation system, an electric boiler, a fuel cell and an energy storage (electrical energy storage and heat energy storage) is built, the 0-1 mixed integer nonlinear programming method is adopted for solving the optimal output force and total running cost of all units in the network, and power and heat dispatching contrastive analysis is carried out on the system and a traditional separated generation and combined generation optimization model. In addition, the influences of the heat and power reliability difference on the running are analyzed and discussed, and therefore the heat and power dispatching module is more reasonable, comprehensive and universal.

The invention discloses a resident intelligent energy management system suitable for an intelligent power grid. Due to the adoption of the resident intelligent energy management system, peak and off peak load regulation of a power load is realized, and the power quality and power reliability are improved. An intelligent energy management controller and an intelligent electric meter are arranged in the home of each resident; a control terminal is arranged on each controllable domestic appliance and a user switch respectively; a distributed power supply accessing device is arranged on each distributed power supply; the controller is connected with the control terminal and the distributed power accessing device through a Zigbee wireless communication network; the intelligent electric meter is connected with the distributed power supply accessing device and the controllable domestic appliance; the controller is communicated with the intelligent electric meter through a bus; the intelligent electric meter is further connected with the secondary sides of a voltage mutual inductor and a current mutual inductor; the controller undergoes information interaction with a high-level measuring system AMI (Advanced Metering Infrastructure) of a main station through Ethernet communication; the controller is used for controlling switching of the control terminal and the distributed power supply accessing device; the control terminal is used for submitting the state of the switch to the controller; the controller is used for monitoring the state of the switch.

The invention discloses a loudspeaker diaphragm which comprises a ball top part (20) in the center and a folding part (10) at the rim. The folding part (10) is a single layer structure made from a TPEE (thermoplastic polyester elastomer) material layer (2) or is a composite structure provided with at least one TPEE material layer (2). Compared with diaphragms made from TPU materials, the diaphragm of the invention has good toughness and strength, can effectively reduce the vibration frequency, and expand the bandwidth of a product. Further, the diaphragm is also stable in structure and reliable in withstanding power and provides good stability of vibration frequency.

The invention relates to a wind-farm reliability evaluation method, and particularly to a wind-farm reliability evaluation method of considering wind-turbine transmission system fatigue. The method solves the problem that risks cannot be accurately evaluated by existing evaluation methods, and includes the steps of: 1, generating a historical fatigue load time sequence and a fatigue load spectrumof turbines; 2, generating a shafting material performance S-N curve; 3, carrying out fatigue analysis on turbine shafting; 4, establishing a shafting fatigue failure rate model; 5, establishing a Markov model of considering the transmission system fatigue; and 6, using a Monte Carlo method for reliability analysis. The method of the invention has the advantage that possibility that fatigue damageof traditional turbine shafting causes a turbines outage and occurrence probability and caused consequences thereof are considered when it is determined that the turbines are in running or outage status, thus a more accurate turbine outage probability model according with reality is provided in turbine reliability modeling, then accuracy of wind-power reliability evaluation is significantly improved, and an analysis result can be indirectly used for guiding of wind-farm overhaul plans and running plans.

The invention relates to a reliability analysis method in the field of accelerated degradation testing, and in particular to a method based on accelerated degradation electrical parameter for analyzing the reliability of a LED integrated driving power within a LED entire light life cycle based on luminous flux. The method aims at using an electrical parameter to analyze the reliability of the LED integrated driving power so as to obtain the result of influence on the lifecycle of the entire lamp by the driving power. The reliability research for the driving power is based on design perspective. According to the invention, the method aims at addressing the problem of reliability analysis of the integrated driving power within the entire life cycle of the LED lamp, establishes a Wiener-based statistic model in accordance with the accelerated degradation electrical parameter, and conducts model parameter identification in combination with the maximum likelihood method and the MCMC method. The improved identification method reduces sampling requirements with the proviso of better protecting the identification precision by improving the identification method. And eventually, the method can provide a reliability index of the LED integrated driving power within the life cycle of the entire lamp in accordance with the constraints of the life cycle of the entire LED lamp based on luminous flux.

The present invention discloses a reliability power outage event collection integrity analysis and automatic completion method, and belongs to the technical field of power reliability management. Themethod comprises: constructing a unified analysis model for power outage events of distribution networks; collecting the automatically collected discrete user power outage information to generate original power outage events; performing collection integrity analysis on the original power outage events, and searching and positioning incompletely collected power outage line segments and omissively collected users; determining and identifying whether the omissively collected users belongs to the users in real power outage; and automatically completing power outage information for the omissive users in real power outage, and uploading a final power outage event to a reliability service system. The method disclosed by the present invention has strong real-time performance, high accuracy, and asmall amount in calculating and processing data, can improve the integrity and accuracy of automatic integration of power outage data, and can provide strong support for reliability index analysis application and daily service management.

The invention discloses a first passage theory-based method for analyzing non-probability power reliability of a vibrating active control system. According to the method, the influences, caused by interval uncertainty of materials, on well-posedness of the active control system is comprehensively considered. The method comprises the following steps: deriving a power response expression of the active control system on the basis of a one-order state-space equation and a state feedback control theory; constructing a non-probability interval process model of controlled structure power response on the basis of an interval mathematic thought and a time varying uncertainty propagation analysis method; and defining a non-probability power reliability index of the vibrating active control system by utilizing a first passage theory and a structure control rate failure criterion, and exploring an efficient and steady solving method. When the method is used for carrying out reliability calculation, the comprehensive influences, caused by material dispersity, on controlled structure power response is embodied, so that necessary and feasible theoretical reference is provided for the fine design of controllers.

The invention discloses a novel parking AGV trolley. The novel parking AGV trolley consists of a bumper, a frame and two sets of symmetrical structures installed on the frame, wherein each set of structures comprises a driving system, a steering system, a vibration attenuation guiding mechanism and a clamping mechanism. The driving system is driven by four electric wheels, all-wheel omni-directional walking can be realized, the effect of bearing a balance car body is reached, and the driving system has relatively high dynamic property; the steering system realizes flexible steering through a swivel bearing and a stepping motor; the vibration attenuation guiding mechanism mainly consists of a spring and a guide rod, and the stability in the transportation process of the trolley is improved;the clamping mechanism comprises a clamping assembly and a clamping adjusting device, the clamping assembly realizes lifting of vehicles, the clamping adjusting mechanism realizes adjustment for thecenter distance of a front clamping device and a rear clamping device, and transportation for vehicles with different distances between shafts can be realized. Compared with the prior art, the novel parking AGV trolley has the advantages of power reliability, steering flexibility, stability in the transportation process and high applicability.

The invention provides a power maintenance operating platform. The power maintenance operating platform comprises a first hoop piece, a second hoop piece, a loading platform and a climbing device, wherein the first hoop piece and the second hoop piece are alternately arranged on a wire pole up and down, the first end of the loading platform is arranged on the first hoop piece, the first end of the climbing device is connected to the second hoop piece, and the second end of the climbing device is connected to the second end of the loading platform far away from the wire bar. The power maintenance operating platform can be used for stably supporting a repairer standing on the loading platform, however the wire pole is slippery in rainy days, therefore the repairer can climb the wire bar successfully to carry out power maintenance operation timely in rainy days, the power supply of the power faulty line can be restored timely, and the powering reliability of a circuit can be improved.

The invention discloses conveying equipment capable of achieving goods delivery with a freely-bent track. The conveying equipment comprises a plurality of conveying sections. The conveying sections comprise turnable chain plate conveying mechanisms and underframe mechanisms. Bottom wheels are installed on the bottom faces of the underframe mechanisms. The turnable chain plate conveying mechanismscomprise chain plates, motors and driving wheels. The chain plates are sequentially connected in series end to end. The motors are connected with the corresponding driving wheels. The chain plates aremovably connected through T-shaped connectors. The underframe mechanisms comprise underframes and universal joint mechanisms. The underframes are movably connected through the universal joint mechanisms. The motors are installed on the corresponding underframes, and the driving wheels make contact with the T-shaped connectors to form driving structures of the corresponding chain plates. Accordingto the conveying equipment, the chain plates and the underframes are designed to be a circulation conveying structure capable of being bent left and right and further being bent up and down, the whole conveying mechanism is composed of the multiple conveying sections, the multiple motors can be installed at the head end and the tail end of each conveying section, and thus power reliability is improved; and meanwhile the defects that a conveying device is small in bending amplitude and prone to breaking down in the prior art are overcome.

The invention discloses an ultra-high-voltage direct-current fault scheduling method based on an aggregated constant-temperature control load, and belongs to the field of electric power system emergency circumstance scheduling. The method includes the steps: building an ultra-high-voltage transmission power reliability model based on ultra-high-voltage element fault probability; performing constant-temperature control load individual scheduling capacity modeling based on electric thermal characteristics; performing aggregation modeling on different constant-temperature control loads in the same area based on constant-temperature control load individual scheduling capacity modeling to determine total constant-temperature control load scheduling capacity; combining an aggregated constant-temperature control load scheduling model and a conventional unit scheduling model based on an optimal power flow module, acquiring an optimal scheduling scheme under the ultra-high-voltage direct-current fault scheduling condition, and assessing the scheduling participation degree of the constant-temperature control load. According to the method, the scheduling participation degree of the constant-temperature control load is assessed, total scheduling capability of a system is improved, the running reliability of a receiving end network of an ultra-high-voltage direct-current system is effectively improved, and the total scheduling cost of the system can be reduced.

The invention provides a method for monitoring and counting power supply reliability of the terminal of a power grid. The method is carried out through an electric energy meter arranged at the terminal of the low-voltage power grid. The electric energy meter comprises an electric energy metering unit, a main control unit, a human-machine interface unit, a storage unit, a real-time clock unit, a communication interface unit and a power module. The method includes the steps of 1, initialization of the electric energy meter; 2, power-on time recording; 3, power-down time recording; 4, power failure time counting; 5, power supply reliability counting. The method is simple, practical and reliable, the power supply reliability of the terminal of the low-voltage power grid can be effectively monitored and counted, the gap for monitoring and counting the power supply reliability of the terminal of the power grid in the prior art is filled in, and an effective information support is provided for a power supply department to improve the power supply quality of the terminal of the power grid.

The invention discloses a distributed power supply grid connection access system. The distributed power supply grid connection access system comprises a grid connection inverter, a distributed power supply access control unit, a mains supply transformer low-voltage wire outlet control unit, a low-voltage reactive power compensation control circuit and a multi-way low-voltage wire outlet circuit. The distributed power supply access control unit is connected with the grid connection inverter, the mains supply transformer low-voltage wire outlet control unit is connected between the distributed power supply access control unit and a mains supply transformer, and the low-voltage reactive power compensation control circuit and the multi-way low-voltage wire outlet circuit are connected with a low-voltage busbar. By means of conversion of new energy resources, failure rate of the system is decreased, and power quality is improved; the system can serve as a standby power supply to provide electric energy for users requiring uninterrupted power supply, power reliability is guaranteed while electric charge is reduced, and reliability of a power distribution network is improved. In addition, distributed generation is flexible in load regulation capability, only a few seconds are required for starting, and output is adjustable by the hour.