253results about How to "Ensure safe and stable operation" patented technology

The invention discloses a novel primary frequency-modulation compensation control method of a unit thermal generator set, comprising the following steps of: 1) adding upper and lower limit values according to an instantaneous generation load instruction and primary frequency modulation of the generator set; automatically calculating a primary frequency-modulation theoretical compensation load limited amplitude according to an algorithm module and setting high and low limited amplitudes of an H/L amplitude limiting module; 2) calculating a primary frequency-modulation theoretical compensation load value through a set function F1(x) according to a power grid operation frequency fluctuation difference value or a turbine rotating fluctuation value; and limiting a primary frequency-modulation compensation instruction of the generator set in a range from minus delta P to delta P through guaranteeing that the frequency modulation motion does not exceed the normal adjusting range of the generator set through the H/L amplitude limiting module; and 3) revising primary frequency-modulation compensation and operating a real-time adjusting-grade pressure, a main steam pressure and a main air temperature parameter according to the generator set; and calculating and revising a primary frequency-modulation instruction through a F2(x) to be output. The novel primary frequency-modulation compensation control method of the unit thermal generator set guarantees that the primary frequency-modulation motion of the generator set meets the design requirements and stabilizes a power supply frequency of a power grid.

The invention provides a simulation verification method for low voltage ride through (LVRT) of a wind farm. The method comprises the following steps of: analyzing operating characteristics of a wind generation set according to a verified wind generation set electric simulation model; establishing a wind farm electric simulation model, and verifying whether the wind farm has LVRT or not; and establishing a regional power system simulation model comprising the wind farm electric simulation model, and verifying influence of wind farm grid connection on secure and stable operation of a power system. The invention provides a complete and effective method for verifying the LVRT of the wind farm; and the method has positive significance on judging whether the wind farm meets the grid connection requirement or not, avoiding large-scale wind power off-line accidents and ensuring secure and stable operation of a power grid, and lays a foundation for establishing and perfecting a wind power grid-connected authentication system in China.

The invention relates to a method for preparing butanediol by carrying out two-stage bed catalytic hydrogenation on butynediol. Aiming at the requirements on the suitability for a reaction system which contains water or fluctuating water content in a process for preparing the butanediol by carrying out two-step hydrogenation on the butynediol, and the inhibition on the generation of carbon deposit, the inventor proposes that: a hydrogenation catalyst A and a hydrogenation catalyst B in a two-stage bed respectively contains a carrier, a metal active component and silane groups, further, the silane groups are grafted through a silylanizing treatment, wherein the content of the silane groups in the total weight of the hydrogenation catalysts is 0.1-12 wt%. Compared with the prior art, under the premise of ensuring that the hydrogenation catalysts have better activity and better selectivity, the method provided by the invention has obvious raw material suitability, and the presence of water hardly influences on the catalytic performance of the hydrogenation catalysts; and meanwhile, the generation of the carbon deposit on the surfaces of the catalysts can be obviously inhibited, and the service life of the catalysts is prolonged, so that the hydrogenation reaction system can have a longer stable running cycle.

The invention provides an ultrasonic guided wave testing method aiming at the angle steel of an electric steel tower, which belongs to the field of ultrasonic guided wave testing. The testing method is mainly and technically characterized by comprising the steps of: selecting an ultrasonic flaw detector, an ultrasonic guided wave probe and a reference block, and manufacturing an artificial defective groove on the reference block; manufacturing a distance-amplitude curve by the reference block; polishing a smooth probe movement area on the surface of the angle steel to be tested and coating a coupling agent; using the ultrasonic guided wave probe to transversely move along the probe movement area for scanning; and judging whether the angle steel to be tested is qualified or not according to the relationship between the echo signal amplitude and the distance-amplitude curve. The testing method uses the ultrasonic detector by matching with the special ultrasonic guided wave probe for exciting the ultrasonic guided wave with designated mode, is used for the nondestructive testing of the angle steel of the electric steel tower, is characterized by simpleness, fastness, safety and reliability, and has great significance in ensuring the safe and stable operation of the electric steel tower and power transmission lines.

A reverse detection method and device of an air conditioner compressor. The method comprises: determining that an air conditioner runs in a heating non-defrosting mode, a refrigeration mode, or a dehumidifying mode; collecting compressor air discharging temperature (Tt) and an air conditioner running current (It); calculating an air discharging temperature difference (ΔΤ); and determining whether the air discharging temperature difference (ΔΤ) is higher then a preset temperature difference and whether the air conditioner running current (It) is within a preset current range, and if yes, determining that the compressor runs in reverse. Also provided is a reverse detection device of an air conditioner compressor. The method and the device ensure safe and stable running of a compressor, and therefore ensure safe and stable running of an air conditioning system.

The present invention provides an AHP-based method for natural disaster risk assessment of a power grid. The method comprises: performing statistical analysis on historical disasters and historical weather forecast information in a region in which an assessed power grid is located, and constructing a risk assessment indicator system through harm identification and vulnerability analysis; constructing a natural disaster risk estimation model of the assessed power grid by using an improved analytic hierarchy process; determining a relative weight of each assessment indicator by using the analytic hierarchy process; determining a risk value the of each assessment indicator based on a preset risk assessment standard; calculating a comprehensive risk value by using the risk value of each assessment indicator and the relative weight of each assessment indicator as an input value of the natural disaster risk assessment model; and establishing a risk level standard so as to obtain a final risk level of the assessed power grid. Impacts from the natural environment and the social environment are comprehensively considered, and comprehensive assessment that combines qualitative and quantitative assessment is performed on the natural disasters of a power grid, thereby providing a theoretical basis for ensuring safe and stable operation of the power grid and for reducing economic loss.

The invention provides a multi-region cooperative joint frequency modulation control method based on a dual-layer model predictive structure. The method realizes the steady-state power optimized application of cross-regional AGC units under the multi-constraint condition on the basis of the economic model predictive control in the upper layer; and the dynamic frequency optimization control of themulti-region AGC units on the basis of the distributed model predictive control is realized in the lower layer. On the slow time scale (minutes), the steady-state power optimized allocation of the cross-regional AGC units considering the safety constraints of tie line sections is realized. On the short time scale (seconds), the dynamic frequency optimization control of the AGC units in each regionis realized.

The invention relates to a non-phosphate anti-incrustation corrosion inhibitor and a preparation process thereof. The non-phosphate anti-incrustation corrosion inhibitor is prepared from anti-incrustation ingredients, corrosion inhibition ingredients, fluorescent indicators, sodium hydroxide and deionized water, wherein the anti-incrustation ingredients comprise polyepoxysuccinic acid, hydrolytic polymaleic anhydride, and crylic acid/ethyl acrylate/2-acrylamide-2-methyl propane sulfonic acid copolymer; and the corrosion inhibition ingredients comprise methylbenzotriazole, sodium gluconate, sodium tungstate and corrosion inhibitor-imidazoline quaternary ammonium salt. The preparation process comprises the following steps: alkalizing the raw materials by utilizing solvent, stirring, mixing, warming up for dissolving, cooling for mixing, carrying out fluorescer formulation, filtering and packaging, thus obtaining the finished product non-phosphate anti-incrustation corrosion inhibitor. The components of raw materials in the invention does not contain substances such as phosphor and the like which are harmful to human body and environment, and the non-phosphate anti-incrustation corrosion inhibitor belongs to a non-toxic nuisanceless product, has good anti-incrustation corrosion inhibition effect, is beneficial to recycling of recirculating water and discharging water, does not cause drug dirt blocking to a recovery system, is biodegradable, does not cause secondary pollution, and has the function of inhibiting the bacterium growth, thus the cost for recirculating water treatment is low and the on-line monitoring control and automatic feed of the drugs can be realized.

The invention discloses a wide-area distance protecting method for transformer substations. The wide-area distance protecting method for the transformer substations comprises the steps that a master station-substation protection control system comprising a master station and multiple substations is established in a regional power grid; on-site judgment of wide-area distance protection is completed by the substations with the transformer substation with secondary direct-current power supply disappearing and a line connected with the transformer substation as protection targets, and the information is uploaded to the master station; after the master judges that a certain transformer substation loses power, wide-area distance protection of the power-losing area of the transformer substation is completed according to the on-site information uploaded by the substations, and then faults in the power-losing area of the transformer substation are isolated rapidly. According to the wide-area distance protecting method for the transformer substations, when the serious accident that the secondary direct-current power supply of the transformer substation in the power grid disappear, the faults in the power-losing area in the transformer substation can isolated rapidly, and safe and stable operation of the power grid is guaranteed.

The invention relates to a method for optimizing electricity network output power in the technical field of electrical engineering, comprising the following steps: calling real-time data and net rack basic parameters of an SCADA database to form tidal data cross-section files; then calling load prediction system data and obtaining load growth mode of the next stage; converting the format of the tidal data cross-section files and the load prediction data to generate output mode optimized format data of the exertion mode of the generator; then carrying out optimization process on the exertion mode of the generator and outputting an optimum proposal; formulating an exertion plan of the generator according to the optimum proposal and implementing the generation exertion mode plan. In the invention, with the optimum proposal of the invention, the purpose of fast and effectively improving transmittable capacity of the power system and strengthening stability level of network voltage can be achieved for the power system transmission.

The invention relates to a performance evaluation device for an excitation regulator and a PSS (power system stabilizer) of the excitation regulator. The device has the following functions: acquired operating data of a generator and operating data of an excitation system are calculated and analyzed, according to control definite value parameters of a PID (proportion integration differentiation) control model of the excitation regulator and a PSS control model of the excitation regulator, PID and PSS evaluation models corresponding to the actual excitation system are established, and finally, the online monitoring and real-time performance evaluation are performed on the PID and PSS models of the excitation regulator. Under the condition that safe and stable operation of a generator set and a grid is not interfered, the device evaluates the performance of the PID and PSS models of the excitation regulator and solves the problem that the PID and PSS models are very difficult to predict and detect.

The invention discloses a crossing toll collection device based on visible light communication. The device comprises a visible light communication device, a controller, a snapshot device and a computer, wherein the visible light communication device is used for achieving data communication between vehicles and a toll station; the controller is used for controlling a lane handrail and a signal lamp; the snapshot device is used for taking candid photographs of the vehicles; the computer is connected with the visible light communication device, the controller and the snapshot device. The invention further discloses a toll collection system of the crossing toll collection device based on visible light communication. The toll collection system comprises a plurality of crossing toll collection devices based on visible light communication, the computers of the crossing toll collection devices based on visible light communication are connected with a switch of the toll station, and the switch is connected with a toll-station server and a database of an expressway system. Ground induction coils do not need to be buried in advance, the visible light communication technology is combined, headlamps of the current vehicles are used fully, erroneous judgment of the vehicles is avoided, and the number of communication dead zones is reduced.

The invention discloses a method for over-speed protection of a turbine under the load shedding working condition, which comprises the following steps that: (1) when the load of a unit is more than or equal to 30 percent of rated load and a generator oil switch is switched off, over-speed protection control (OPC) acts, and when the rotating speed of the turbine is less than the rated rotating speed, the OPC resets; and (2) when the rotating speed of the turbine is more than or equal to 103 percent of the rated rotating speed, the OPC acts, and when the rotating speed of the turbine is less than the rated rotating speed, the OPC resets. By the technical scheme, for a turbo generator unit with a fully opened intermediate regulating valve under the load shedding working condition, the OPC action frequency can be effectively reduced and secondary acceleration over-speed can be avoided under the load shedding working condition; and for a unit of which the intermediate regulating valve participates in regulating under the load shedding working condition, the rotating speed of the unit is stabilized as soon as possible. Therefore, the technical scheme has important significance for ensuring the safe and stable running of the turbo generator unit and safe power supply of a power grid.

The invention relates to a control method of overload load-shedding for a transformer or a circuit, which is characterized in that: a plurality of independent overload action levels are classified according to different power, current and overload time-lag of the transformer or the circuit, each overload action level is provided with an independent power starting and returning constant value, an independent current starting and returning constant value and an independent time-lag starting and returning constant value; after each overload action level acts, the load is shed in different turns of actions; time-lag exists between every two turns of shedding actions, if the load is decreased to a normal level for a certain time-lag after one turn of load shedding, the overload action level is returned, and the load shedding is ended; and otherwise the next turn of load shedding is continued after the time-lag. Due to the adoption of the control method, the safe and stable running of the transformer or the circuit can be guaranteed, and at the same time minimal over-shedding is guaranteed under the situation that the size of the shed load is unknown.

The invention relates to a high-permeability wind power primary and secondary backup coordination control method, and belongs to the technical field of electric power system control. According to the method, the principle that primary backup is used at first and secondary backup serves as transition is used, and then primary frequency modulation backup capacity is supplemented so that the quick frequency modulation capacity can be abundant; the fluctuation window principle is used for calculating the secondary frequency modulation backup capacity of a power grid so as to realize coordinate control of the primary frequency modulation backup and the secondary frequency modulation backup and guarantee safe and stable running of the power grid. During running of a high-permeability wind power grid, through coordinate matching of the first frequency modulation backup and the secondary frequency modulation backup, wind power intermittent disturbance can be handled, and the system frequency can be stabilized; when the fluctuation window principle is used for conducting secondary backup distribution, it can be guaranteed that a power generating unit can complete a secondary frequency modulation task, meanwhile, the modulation times can be obviously reduced and the secondary backup efficiency can be improved.

The invention discloses a temperature control method and device for a power module of a frequency converter. The temperature control method for the power module of the frequency converter comprises the following steps: detecting an outdoor environment temperature; determining maximum permissible running current of the power module according to the outdoor environment temperature; and detecting actual running current of the power module, adjusting the actual running current, and enabling the actual running current to run in a maximum permissible running current range. According to the temperature control method for the power module of the frequency converter, the circumstance that a system carries out protection detection action due to over-high inside temperature of the power module can be avoided effectively, and therefore, the system can run safely and stably.

The invention relates to a method for preparing cyclohexane by hydrogenating benzene. According to the requirements of adaptability to water content fluctuation of a reaction system and inhibition of carbon deposit in the process of hydrogenating the benzene at present, hydrogen/benzene mixed gas in a certain molar ratio is introduced into a reactor and contacted with a benzene hydrogenation catalyst to prepare the cyclohexane at the inlet temperature of between 100 and 320 DEG C under the reaction pressure of 0.1 to 4.0MPa, wherein the hydrogenation catalyst comprises a carrier, metal active ingredients and a silane group which is grafted by silylation and accounts for 0.1 to 15 weight percent of the catalyst. Compared with the prior art, the method has the advantages that: the method is high in raw material applicability on the premise of ensuring that the benzene hydrogenation catalyst has high activity and selectivity, and the catalytic performance of the benzene hydrogenation catalyst is almost not influenced by trace water; meanwhile, the carbon deposit on the surface of the catalyst can be obviously inhibited, the service life of the catalyst is prolonged, and the catalyst has a long stable operation period.

The invention discloses a device and a method for detecting sulfur hexafluoride gas in an oil immersed transformer. The device comprises a carrier gas generator, an oil absorption column connected with the carrier gas generator, an A chromatographic column (4) and a B chromatographic column (6) which are respectively connected with the oil absorption column, an FID (flame ionization detector) connected with the A chromatographic column, and a TCD (Thermal Conductivity Detector) connected with the B chromatographic column, wherein a sample inlet is formed between the carrier gas generator and the oil absorption column. If suspecting the sulfur hexafluoride gas leaks into the transformer, a user can know the leakage condition of the sulfur hexafluoride gas simultaneously when analyzing the dissolved gas in the conventional oil, by taking an oil sample or a gas sample from the transformer by the device according to the method, and therefore a chromatographic instrument for the dissolved gas in the oil of the transformer and a special chromatographic instrument for the sulfur hexafluoride are prevented from being damaged, and especially the timely confirmation of the sulfur hexafluoride leaking into the transformer has significance for ensuring the safe and stable operation of the transformer.

The invention relates to the technical field of power, and especially relates to an electric energy quality monitoring system. The system comprises an electric energy quality monitoring terminal, a monitoring center main station, and a work station. The monitoring center main station and the electric energy quality monitoring terminal are connected with an electric energy quality monitoring management application system through network lines. The system can be used for building the electric energy quality monitoring management application system which accords with a power grid system building standard and is opened in a unified manner, so as to build a power grid electric energy quality monitoring, estimation, hazard analysis and measure management system netweork. Through the analysis and enhancement of power grid electric energy quality supervision and management, the system can guarantee the safe and stable operation of a power grid. Through the analysis of monitoring data, the summarizing of causes and the proposing of corresponding rectification measures, the system carries out the comprehensive treatment of electric energy quality, improves the power supply quality, reduces the equipment faults and power failure time, reduces the energy consumption, and provides advices for the optimization of the power grid and fault analysis.

The invention relates to a method for removing phenylacetylene in the presence of styrene. According to the requirements of adaptability to water or water content fluctuation of a reaction system and inhibition of carbon deposit in the selective hydrogenation process of the phenylacetylene at present, a hydrogen/phenylacetylene hydrocarbon mixture in a certain molar ratio is introduced into a reactor and contacted with a hydrogenation catalyst to remove the phenylacetylene at the inlet temperature of between 10 and 120 DEG C under the pressure of 0.1 to 4.0MPa, wherein the hydrogenation catalyst comprises a carrier, metal active ingredients and a silane group which is grafted by silylation and accounts for 0.1 to 15 weight percent of the catalyst. Compared with the prior art, the method has the advantages that: the method is high in raw material applicability on the premise of ensuring that the catalyst in the method has high activity and selectivity, and the catalytic performance of the selective hydrogenation catalyst is almost not influenced by trace water; meanwhile, the carbon deposit on the surface of the catalyst can be obviously inhibited, the service life of the catalyst is prolonged, and the catalyst has a long stable operation period.

The invention discloses a reasonable and effective user peak shaving potential analysis method based on data mining, and the method comprises the steps: firstly enabling power utilization customers tobe precisely classified into D categories through employing a K-means algorithm based on particle swarm improvement based on the power utilization collection data of C points of an intelligent electric meter every day; secondly, deeply mining the power consumption level of the user, the peak matching degree with the system and the power consumption characteristics of the vacancy condition of thehouse based on the data, and performing multi-dimensional analysis on factors related to the peak regulation potential of the user; performing pattern label identification on the user based on a BP neural network; and finally, building a peak shaving potential analysis model of the user by using an improved RBF network based on a genetic algorithm. The peak shaving potential of the user is reasonably analyzed, implementation of the demand response activity is effectively guided, and the effectiveness of the demand response activity is improved.

The invention discloses an improved additional frequency control method and system for a multi-terminal flexible DC power transmission system. The method comprises the steps of calculating the frequency deviation of an AC system, calculating a frequency droop coefficient actual value according to the AC system frequency deviation, calculating an error between the converter station active power actual value and a reference value according to the frequency droop coefficient actual value and the active power transmitted by the converter station, subtracting the DC side outlet voltage of the converter station from the DC voltage reference value of the converter station to obtain an error between the actual value of the DC side outlet voltage of the converter station and the reference value, calculating an actual value of a DC voltage droop coefficient according to the AC system frequency deviation, and calculating a converter station d-axis current reference value according to the error between the converter station active power actual value and the reference value, the error between the converter station DC side outlet voltage actual value and the reference value and the DC voltage droop coefficient actual value. By adopting the method and the system provided by the invention, the DC voltage can be prevented from being greatly reduced due to a large amount of unbalanced power, andthe frequency of a weak AC system can be prevented from greatly deviating.

The invention discloses a swinging concrete mixing device for construction, which comprises a tank body, a moving seat, a bottom plate, a base and a motor; several springs are installed between the bottom plate and the base; the upper end of the moving seat is provided with a downwardly concave arc Shaped groove, a moving wheel is installed at the bottom of the tank body, the moving wheel is in contact with the arc groove, and the limit wheel is fixedly installed on the upper end of the bracket; a push plate is fixed on the end of the piston rod of the cylinder; The stirring blade and the planetary gear mechanism include an outer ring, a planetary gear carrier, a sun gear, a planetary gear and internal teeth, and a vertical scraper is fixed on the end of the connecting rod. The tank body swings left and right under the push of the cylinder, changing the flow direction of the internal raw materials, so that the raw materials can be mixed in the longitudinal direction, and the mixing effect of the raw materials is improved. The swing is safe and stable, no manual operation is required, and the degree of automation is high; between the base and the bottom plate The provided spring acts as a shock absorber to prevent vibration from generating noise.

The invention discloses an alarm linkage video monitoring system and method for a cable terminal tower field. A wireless audio and video encoder is connected with an intelligent control terminal through a serial port; an upper computer respectively communicates with the intelligent control terminal and the wireless audio and video encoder, the intelligent control terminal communicates with an alarm signal input and output device, and the wireless audio and video encoder is respectively connected with an audio collection device and a tripod head controller; and a hybrid power supply apparatus is connected with the intelligent control terminal for supplying power to a cable terminal tower video monitoring system. The alarm linkage video monitoring system and method disclosed by the invention have the beneficial effects of completely solving the problem that single solar power supply is influenced by weather factors, controlling the security of onsite implementation periphery, carrying out linked alarm on abnormal invasion and snap shooting and recording dangerous point images of onsite electrical appliances, and a periodical and automatic image snap shooting and recording function of critical points guarantees the safe and reliable operation of the terminal tower, so as to guarantee the safety and stability of the entire power supply system.

The invention discloses a two-stage power distribution network post-disaster first-aid repair scheduling and load recovery collaborative optimization method and system. The method comprises the following steps: evaluating element damage conditions of a power distribution system; partitioning the fault points; carrying out preliminary recovery by using the distributed power supply, establishing a nonlinear programming model of the preliminary recovery, obtaining a linearized network reconstruction model, and solving to obtain a load recovery result of a first stage without considering a maintenance process as an initial recovery result; solving a collaborative optimization model of first-aid repair personnel allocation and load recovery by taking the maximum load recovery amount and the minimum recovery time as targets to obtain a network reconstruction time sequence change process, a first-aid repair personnel advancing line and a load recovery sequence result of a second stage considering maintenance scheduling; and as a final result for guiding the operation personnel to carry out post-disaster recovery, carrying out collaborative optimization. The post-disaster recovery capability of the power distribution network is improved, the downtime and the economic loss are reduced, and the recovery capability of the power distribution system is enhanced.