256results about How to "Safe and reliable power supply" patented technology

The invention relates to a local discharge electroacoustic united detection positioning system and a positioning method thereof in the technical field of electric power systems. The local discharge electroacoustic united detection positioning system comprises a plurality of sensing and amplifying modules, a front end detection module and an industrial control module, wherein the sensing and amplifying modules are arranged on a GIS casing cavity body to be tested and are connected with the front end detection module for outputting amplifying signals, the front end detection module carries out synchronous signal collection on a plurality of paths of input amplifying signals and outputs the amplifying signals to the industrial control module, and the industrial control module outputs a control command to the front end detection module. The invention concentrates the advantages of an ultrahigh frequency detection method and an ultrasonic detection method, discovers the defects of insulation matching and the like possibly existing in the installation process of the GIS in time, enhances the acceptance check accuracy and ensures the safe and reliable power supply of an electric power system.

The invention relates to an optical storage alternating current and direct current hybrid micro-grid system and a control method of the system. The system and the method are characterized in that a hybrid micro-grid comprises an alternating current micro-grid subsystem, a direct current micro-grid subsystem and a power exchange control system; the alternating current micro-grid subsystem comprises an alternating current side photovoltaic power generation unit, an alternating current load and a grid-connected interface; the direct current micro-grid subsystem comprises a direct current side photovoltaic power generation unit, a storage battery energy storage unit and a high/low voltage direct current load; the power exchange control system comprises a two-way AC/DC power converter, a transformer, a micro-grid controller and a communication system, the storage battery energy storage unit is used for controlling direct current bus voltages, and P/Q control is adopted in the two-way AC/DC power converter. Under the stabilizing effect of direct current side energy storage, the direct current micro-grid subsystem conducts photovoltaic power generation and is connected to a large power grid through the alternating current micro-grid subsystem at constant power, and the photovoltaic utilization rate is increased. By means of the control method, the power supply reliability and economical efficiency of the hybrid micro-grid are effectively improved.

The invention discloses a high-precision Ethernet timing device which is characterized in that hardware comprises a time processing module CPU (central processing unit), the time processing module CPU is connected with a time processing field programmable gate array (FPGA) through a BUS and is connected with a GPS (global position system) receiving module through a serial port as well as connected with an IEEE1588 (Institute of Electrical and Electronic Engineers 1588) ground synchronization network module through a timing signal; the IEEE1588 ground synchronization network module comprises an IXP425 processor and an IEEE1588 FPGA port, a low-temperature drift crystal oscillator is used as a crystal oscillator source to be accessed into an FPGA phase-locked loop, and a time clock port FPGA, the IEEE1588 ground synchronization network module and the time processing module CPU are provided with timing signal output ports. The invention can be used for building an IEEE1588 ground time synchronization network and supporting clock mutual automatic switching, and can achieve timing precision of 100us in an electric system II region Ethernet under the condition of not supporting IEEE1588 by a router switch and the like.

The invention relates to the field of electric power system monitoring, in particular to a cable 10kV high voltage ring main unit remote monitoring and control system which is used for conducting real-time monitoring of operation conditions of power distribution facilities and distribution cable lines, realizing early warning and alarming of abnormal and failure states and postmortem analysis after accidents, and controlling and regulating the operating environment of equipment through remote operation. According to the cable 10kV high voltage ring main unit remote monitoring and control system, grid smart operation management serves as the target, various on-line monitoring techniques are integrated, and monitoring cameras, a fan and solar equipment are installed in a switching station; the system can be used for checking the information of the monitoring cameras in the switching station in real time, monitoring the operating state of the fan, realizing the early warning and alarming of the abnormal and failure states and the postmortem analysis after the accidents, realizing dynamic evaluation of health conditions of the equipment, and realizing remote operation control over monitoring of the equipment; a multi-dimensional display technology is combined, safe and reliable operation capacity of a distribution network is enhanced, trouble shooting efficiency and maintenance efficiency are improved, and therefore a complete set of grid visual monitoring system is formed.

The invention provides a power distribution network overall planning method and system. The power distribution network overall planning method includes the steps: 1) dividing power supply areas; 2) determining the power supply area attribute and the planning strategy; 3) carding the present situation of grids; 4) predicting load; 5) determining the planning target; 6) dividing the power supply grids; 7) planning a power supply grid present situation wiring diagram and a target wiring diagram; 8) determining the planning scheme and the transitional scheme; 9) forming concrete implementation projects; and 10) compiling the line channel planning. The power distribution network overall planning method and system can systematically guide planning and construct a medium voltage power distribution network rack so as to guarantee reliability and firmness of the medium voltage power distribution network. The power distribution network overall planning method and system can construct a power distribution network with necessary capacity margin, proper load transferring capability, certain self-healing capability and emergency processing capability, and reasonable distributed power supply admission capability, and can safely, reliably and economically supply power for the user.

The invention discloses a method for sorting degree of self-discharging of lithium ion batteries. The method comprises the following steps: Step I, a plurality of batteries to be sorted are placed at the room temperature and respectively are discharged to a preset charge state, and the first test voltage of the batteries are respectively measured; Step II, preset time of the plurality of batteries is continuously set at a preset temperature, and the second test voltage of the plurality of batteries is respectively measured; and Step III, a value difference between the first test voltage and the second test voltage of each battery is compared with the range of a preset battery value difference, batteries within the preset battery value difference are sorted, and the sorted batteries are batteries with the same self-discharging performance. The method for sorting the degree of the self-discharging of the lithium ion battery can accurately and reliably sort the batteries with coincident self-discharging performance, so as to effectively match the batteries with the same self-discharging performance to form battery groups.

The invention relates to an analyzing and processing method for power user demand side, in particular to a power demand side optimization method combining market demand response with physical demand response. The power demand side optimization method combining market demand response with physical demand response comprises the following steps of constructing an optimization model for an interruptible load, then constructing an optimization model for a real-time electricity price, and finally obtaining a combined optimization model; and setting an optimal price at 24-t by only considering the real-time electricity price according to the combined optimization model, changing the electricity price at t+1, substituting the two prices into the combined optimization model under the condition of considering an interruptible electricity price, calculating whether a restraint is met, and finally calculating the benefit of a power supply company according to the optimal electricity price under the current interruptible load and real-time electricity price combined demand side management. The method has the effects that the market demand response and physical demand response common measure real-time electricity price and the interruptible load are combined, and the optimal combination acts on the power grid demand side, so that an obvious effect on management of the demand side is achieved; peak clipping and valley filling can be realized; the energy efficiency can be improved; and the power utilization mode can be optimized.

The invention discloses a STATCOM (static synchronous compensator) control system adopting a droop control strategy and a control method thereof. The STATCOM control system adopting the droop control strategy comprises a direct-current side capacitor, a three-phase inverter bridge and an inductance-capacitance filter, wherein the direct-current side capacitor and the three-phase inverter bridge are connected in parallel and then connected with the inductance-capacitance filter, and the inductance-capacitance filter is connected to a PCC (Point of Common Coupling) of a power grid by a three-phase switch K through a coupling transformer T. The control method disclosed by the invention comprises the steps of real-time signal collection, computation of active power reference value P*, computation of reactive power reference value Q*, computation of frequency reference value omega* and voltage modulation amplitude reference value E*, computation of phase reference value Delta* and computation of voltage modulation signals; and only one PI (proportional integral) regulator and two droop control coefficients need to be regulated, thus the whole control method is easy to realize, and further the power system can better supply power to users safely, excellently and economically.

The invention discloses a monitoring device for temperature rise and vibration of a motor and a realizing method thereof, solving the problems of the present monitoring device that the motor vibration monitoring is defective, the monitoring data is incomplete and the like. The monitoring device for temperature rise and vibration comprises a microprocessor, a power supply processing module, a motor current collecting module, a motor vibration and temperature rise collecting module, a man-machine interaction module and a communication data transmission module, wherein the microprocessor is used for receiving and processing the data information; the power supply processing module is used for supplying power for the operation of the device; the motor current collecting module is used for collecting and converting a voltage signal which is converted from the current acquired by a current transformer; the motor vibration and temperature rise collecting module is used for collecting the motor vibration and temperature data information; the man-machine interaction module is used for realizing man-machine interaction; the communication data transmission module is used for uploading the monitored condition of the motor to a detection system. The monitoring device provided by the invention has a current detection function and can be used for comprehensively monitoring the abnormal overload, abnormal temperature rise and abnormal vibration of the motor.

The invention provides a method, a device and a system for performing video monitoring on an outdoor ring main unit. The method provided by the invention comprises the following steps: receiving and storing video images collected through a camera video and transmitted after being digitally processed in the ring main unit; performing image identification on the video images to judge whether the insulating surfaces of ring main cables have discharging trace or condensation; and if so, automatically generating alarm information and informing maintenance staffs. According to the method, the device and the system for performing the video monitoring on the outdoor ring main unit, whether the insulating surfaces of the cables in cable chambers of a plurality of ring main units have discharging trace or condensation can be judged, so that unnecessary power outage times caused by site detection are effectively reduced, the ring main unit is enabled to more safely and reliably supply power for users, and the requirements of the users on continuous power supply are met.

The invention disclose an online capacitor monitoring system based on a partial discharge monitoring, and the system provided by the invention comprises a plurality of sensors, amplifiers and signal processing units, an AD (Analog-to-Digital) conversion unit, and a control process and display unit. A series of operations comprising amplification, filter, following, AD conversion, data analysis, data process and storage are carried out on sensing signals so that an automatic alarm is turned on when the fault of a capacitor is detected; and meanwhile, all operation data is sent to a remote monitoring computer. Based on the partial discharge monitoring, the invention provides a combined acoustic-electric detection system based on the partial discharge by combining the advantages of two detection methods, namely a partial discharge electric detection method and an acoustic detection method; the combined acoustic-electric detection system can be used for continuously monitoring the operation condition of the capacitor and diagnosing abnormalities in an early stage, so that the safety and reliability of electricity supply of an electric power system are guaranteed.

The invention discloses a method for predicting the wind speed of a wind power plant at a short term. The method includes the following steps that wind speed data in a period of time are acquired and reduced into a time sequence for analytical prediction; a carpet traversal search method is adopted, and based on a dynamic cubic exponential smoothing prediction method, dynamic smoothing coefficients are determined according to the criterion of the minimum error sum of squares; the determined dynamic smoothing coefficients and the dynamic cubic exponential smoothing method are utilized to conduct one-step or multi-step prediction; the rest is conducted in the same way, new historical data are acquired, the smoothing coefficients are updated, and the later wind speed prediction continues to be conducted. According to the method for predicting the wind speed of the wind power plant at the short term, the characteristics of local historical wind speed are comprehensively considered, and the prediction effect is good.

The invention discloses a small-current single-phase earth fault line selection method based on spiking neural P systems. The method comprises the following steps: extracting zero sequence characteristics, comprising steady state and transient characteristics, of each line of a power distribution network at the fault moment, and establishing a fault measurement function of each line; obtaining theline selection criterion weight and line selection decision rule based on an information gain degree and a rough set theory; and performing fuzzy reasoning on the spiking neural P systems to obtain the fused fault measures, and determining the faulty line. According to the method disclosed by the invention, the fault information is fully utilized, the acquired steady state zero sequence current amplitude, steady state zero sequence current phase angle, zero sequence reactive power amplitude, zero sequence admittance amplitude, transient zero sequence current energy value and transient zero sequence current effective value are taken as the line selection criterions, the maximal fault measure is obtained by performing fuzzy reasoning on the spiking neural P systems, line selection results can be accurately obtained, the defect that a single line selection criterion cannot adapt to a complex fault condition is overcome, the small-current fault line selection precision is improved, and safe and reliable power supply of the power system is ensured.

The invention discloses an intelligent power supply control box. The intelligent power supply control box comprises an intelligent power distribution control module, an intelligent power distribution module, an I/O (Input/Output) extension board, a communication interface, a shell and an electric connector. According to the intelligent power supply control box, the operation state of electric equipment is monitored, managed and controlled by a microprocessor and information processing and communication techniques; the intelligent power supply control box serves as a power supply control and management center and has the functions of acquiring and monitoring data, managing power distribution operation and managing load operation. The control box and a method can be used for intelligently managing various paths of output and separating various paths of output switches, isolating fault, randomly grouping and starting in time sequence; the control box has the functions of protecting voltage, current and temperature and is capable of ensuring the important output as a priority; power supply management software is adapted to domestic operation environment and can be used for remotely monitoring and managing the various paths of output, quickly determining fault parts and reasons, resetting or repairing the fault output in time, improving the system maintainability and reducing the average fault recovery time.

The invention discloses a drying agent for an mine underground electric apparatus and a preparation method of the drying agent, belonging to the field of drying agent, wherein macromolecule water absorbent, compound of silicon or calcium and alkali halide or modified starch are mixed so as to prepare the powdery draying agent according to part by weight; the macromolecule water absorbent is 35-70 parts; the compound of silicon or calcium is 25-55 parts; the alkali halide or a mixture of the alkali halide and the modified starch is 10-15 parts; the grain size of the macromolecule water absorbent is 0.20-0.40mm; and the drying agent is powdery. According to the invention, raw material is wide in source and is purchased easily on the market; the drying agent is used for high/low-voltage power supply appliances worked on a mine underground high-humidity condition (RH=80-100%); the dry powder resists 6000V voltage or does not be broken down under voltage of 3000V; when moisture rate reaches to 1g/g, the dry powder resists 2500V voltage or does not be broken down under voltage of 1200V.

The invention discloses an electrothermal energy storage system. The electrothermal energy storage system comprises a heat pump system, a heat-storage and cold-storage system and a heat engine system, wherein the heat pump system comprises a motor, a compressor, a heat-storage heat exchanger and a cold-storage heat exchanger; and the heat-storage and cold-storage system comprises a low-temperature storage tank, a high-temperature storage tank and a normal-temperature storage tank. By the system, electric power can be stored. Moreover, the electrothermal energy storage system is small in occupied space, does not depend on petrochemical fuels, and has little influence on an ecological environment.

A lossless equalization controller and a control method belong to the technical field of battery equalization control. The controller comprises a battery pack formed by a plurality of cells, an equalization switch control module, an equalization power control module, an equalization power transformation module, an equalization charging control module, a system power supply module and a master control module, wherein the system power supply module supplies power to the equalization switch control module, the equalization charging control module and the master control module. The controller has the advantages of rapid equalization speed, safe and reliable equalization process, low cost and easy promotion and application. The control method includes detecting battery equalization degree, equalizing laggard cells in the battery pack when the battery equalization degree is equal to or greater than 0.3%, detecting system fault, clearing system fault and other detection steps. The equalization precision is high, and the equalization process is safe and reliable.

The invention discloses a state evaluation method of a cloud model and a genetic algorithm optimized support vector machine. The method comprises the following steps: firstly, preprocessing operationstate data acquired by an acquisition unit to form a sample database; selecting a radial basis kernel function as a kernel function of the support vector machine; a genetic algorithm is adopted to optimize kernel function parameters and error penalty factors of the support vector machine; A genetic algorithm optimized support vector machine state evaluation model is established, an evaluation problem is converted into a classification problem, the operation state of a protection device is evaluated, uncertainty mapping between the health degree and a comment domain is achieved through randomness and stable tendency of a cloud model, and an evaluation result better conforms to the actual situation. The method greatly improves the efficiency of state maintenance work, enables operation and personnel to master the operation state of the protection device in time, prevents safety accidents of equipment, guarantees the safety and reliability of power supply, and remarkably improves the evaluation accuracy.

The invention relates to a single-phase double-boosting bridgeless five-level rectifier based on a bidirectional tube plug-in type structure. The single-phase double-boosting bridgeless five-level rectifier based on the bidirectional tube plug-in type structure comprises an alternating current power supply Ug, a double-coupling magnetic winding N1, a double-coupling magnetic winding N2, a capacitor C1, a capacitor C2, switching tubes Q1, Q2, Q3 and Q4, diodes D1, D2, D3 and D8 and a load R. According to the circuit of the single-phase double-boosting bridgeless five-level rectifier based on the bidirectional tube plug-in type structure of the invention, a bridgeless design idea is expanded to the five-level Boost type rectifier, and five levels are realized by adopting different combination modes of the switching tubes; and when a bidirectional tube is in a fault state, the circuit can still realize the power output of a direct current side. The circuit of the rectifier has the advantages of small harmonic content and high anti-electromagnetic interference performance. The voltage stress of the switching tubes is greatly reduced, so that the working reliability of the circuit is improved; power factor correction can be achieved, and reliable load power supply can be guaranteed.

The invention relates to an off-grid control method of a micro-grid energy storage device based on power prediction and adopts a double-loop control strategy. The control of the storage battery adopts voltage to control an external loop and adopts current to control the internal loop; the control of a super capacitor adopts power to control the external loop and adopts the current to control the internal loop. Photovoltaic output power PV and load power PL of different times in a day are determined according to a power prediction curve; a difference value signal P delta of the output power PV and the load power PL is calculated; a DB9 wavelet packet decomposition method is adopted to perform decomposition on the difference value signal P delta to obtain a high frequency part signals Phigh and low frequency part signals Plow; the low frequency part signals Plow is complimented by the output power of the storage battery; and the high frequency part signals Phigh is complimented by the super capacitor output power.

The invention discloses a two-AC and one-DC series-parallel microgrid structure suitable for multi-station integration. The series-parallel microgrid structure is formed by series-parallel connectionof an alternating-current sub-microgrid 1, an alternating-current sub-microgrid 2 and a direct-current sub-microgrid, wherein the alternating-current sub-microgrid 1 is connected with the direct-current sub-microgrid through a power conversion device and a connecting point 1, and the alternating-current sub-microgrid 2 is connected with the direct-current sub-microgrid through a connecting point2; the connecting point 1 and the connecting point 2 are DC/AC conversion devices, the connecting point 2 is a standby power supply point of the connecting point 1, the energy of the connecting point2 can only flow in one direction, and the voltage is rapidly supported for the direct-current sub-microgrid only when the connecting point 1 fails; the alternating-current sub-microgrid 2 comprises aNo.2 energy storage and station transformer, a 400V/380V isolation transformer, an energy storage battery and an AC/DC conversion device; the NO.2 energy storage and station transformer is connectedwith an external network, the 400V/380V isolation transformer and the AC/DC conversion device, and the AC/DC conversion device is connected with the energy storage battery. The series-parallel microgrid structure is high in reliability, wide in coverage, high in fusion degree and excellent in economy.

The invention relates to a cooling method for an oil-immersed transformer and a system thereof, and aims at providing a two-cycle cooling method for the oil-immersed transformer; the transformer oil of the oil-immersed transformer transmits heat to liquid evaporation cooling medium with low temperature by a heat exchanger, and the liquid evaporation cooling medium is vaporized after the temperature thereof rises; gaseous evaporation cooling medium is condensed into liquid by a condensing device, and the liquid reflows to the heat exchanger; another purpose of the invention is a cooling system of the oil-immersed transformer, and the oil-immersed transformer, the heat exchanger and the condensing device are connected together by a pipeline; the transformer oil is stored in the oil-immersed transformer and passes through the oil line part full of the heat exchangers of the pipelines, and the liquid evaporation cooling medium is stored in the evaporation cooling medium part of the heat exchanger; the adopted evaporation cooling medium is fluorocarbon. The cooling method and the system for the oil-immersed transformer solves the problem of large occupying field of the transformer cooling device and outside natural environmental impact and have the advantages of small occupy area, low noise, low energy consumption, safety and reliability.

The invention relates to an automatic control system for preventing electric leakage, fire and harmonic pollution. The automatic control system is provided with a main station, a substation and a customer terminal, wherein the substation is provided with an equipment security monitor; and the customer terminal is provided with an equipment security monitor, an intelligent power monitoring instrument, a carrier electric meter and a multifunctional electric meter with harmonic monitoring function. Based on an integrated information platform created by a GIS, an equipment security tester detects the electric leakage and the multifunctional electric meter with the harmonic detection function monitors a harmonic component, so the automatic control system discovers the fault in time, is matched with the GIS system to accurately judge a fault point, solves the problem of large-area interruption maintenance when the conventional power grid accidents happen, and fulfills the purposes of secure, reliable, energy-saving and environment-friendly power supply and power utilization.

The invention discloses a power transmission tower deformation monitoring method based on Beidou III double-frequency non-combined RTK positioning. The method comprises the following steps: 1, a monitoring point receives a Beidou III satellite signal, and performs demodulation, despreading, decoding and resolving to obtain a pseudo-range and a carrier phase observation quantity; 2, a reference station receives the Beidou III satellite signal, performs demodulation, despreading, decoding and resolving to obtain the pseudo-range and the carrier phase observation quantity, performs positioning, and obtains differential correction data through an algorithm; 3, the reference station and the monitoring point perform differential positioning through a differential positioning algorithm; 4, deformation displacement data is transmitted to a server through a communication network, and a server calculates an offset according to change of a real-time positioning point; 5, offset data is recoded toa data center, and an early warning is given according to a preset safety threshold; and 6, user windows and an android client access the server to obtain historical change data and view real-time deformation data.

The invention discloses a low-voltage user loop impedance estimation method based on a unitary model, and belongs to the technical field of electric management. The method is characterized by defininga user loop impedance ZL on the basis of time series data for acquiring voltage and current through a user intelligent electric meter, and deducing and building a unitary linear model of a low-voltage user loop impedance by utilizing a KVL loop voltage equation. The loop impedance estimation method comprises the steps of firstly selecting a data acquisition time interval on the basis of a peak valley ordinary time frame statistics division at the area, observing a current step moment of a user at an interval of 5min within the time frame, and freezing voltage-current data before and after thestep; and then adopting one-day data as a sample, carrying out linear-regression analysis, and estimating the user loop impedance ZL, wherein the loop impedance value can be used for estimating and judging a health ageing degree of a low-voltage distributing network circuit and a user abnormal power utilization behavior.

The invention discloses a low-voltage user loop impedance binary linear model construction and solving method. The method belongs to the technical field of power management, and comprises the following steps: collecting time series data of voltage, current and power factors acquired by a user intelligent electric meter, deducing and constructing a binary linear model of low-voltage user loop impedance by utilizing a KVL loop voltage phasor equation on the basis of a low-voltage distribution network circuit model; in a loop impedance solving process, firstly, selecting a data acquisition time period on the basis of statistical division of peak and valley usual periods of the region, observing the current step moment of a user at an interval of 5 min in the time period, and freezing voltageand current data of the two moments before and after the step moment; and then performing linear regression analysis by taking multi-day data as samples, performing sample cleaning and multiple iterations according to residual analysis of regression results, accurately calculating user loop impedance, and using the loop impedance numerical value for estimating and judging the health aging degree of the low-voltage distribution network line and the abnormal power consumption behavior of a user.