179results about How to "Low real-time" patented technology

The invention discloses a driver fatigue monitoring device based on multivariate information fusion and a monitoring method thereof. The device comprises a digital signal processor, a camera head with a filter, a rectangular ultrared LED light source module mounted on a car windshield, a speaker module and a sensor module comprising an angular sensor and a pressure sensor, wherein the camera head, the rectangular ultrared LED light source module, the speaker module and the sensor module are respectively connected with the digital signal processor. The monitoring method comprises four procedures, namely eye characteristic identification, view line track, driving activity monitoring and fatigue characteristic judgment which merges the fatigue judgment results of the eye characteristic identification, the view line track and the driving activity monitoring to accurately judge the fatigue states of a driver. The invention utilizes an information merging technology to further develop and improve a fatigue driving detection technology, can objectively, rapidly and accurately judge the fatigue state of the driver in real time and avoids traffic accidents caused by fatigue driving.

The invention discloses a storage battery state of charge estimation method based on self-adaptive unscented Kalman filtering. The method comprises that: performance of a storage battery is tested via an HPPC test so that HPPC test data of the storage battery are acquired; parameter identification is performed on the basis of the acquired HPPC test data of the storage battery so that storage battery model parameters are acquired; and an SOC of the storage battery is estimated on the basis of the acquired storage battery model parameters via an AUKF algorithm. According to the storage battery state of charge estimation method based on the self-adaptive unscented Kalman filtering, defects in the prior art that manual amount of labor is large, real-time performance is poor, operation difficulty is high, test and calculation accuracy is low, etc. can be overcome so that advantages of being small in manual amount of labor, great in real-time performance, low in operation difficulty and high in test and calculation accuracy can be realized.

The invention provides wearable equipment, an air conditioner control device, an air conditioner control method and an air conditioner. The wearable equipment comprises a detection unit, a calculation unit, a conversion unit and a sending unit, wherein the detection unit is used for detecting the breathing frequency, body temperature and / or infrared heat generating amount of a user, the calculation unit is connected with the detection unit, and is used for converting the infrared heat generating amount into the heat radiating amount of the user, and calculating the difference between the heat radiating amount and the standard heat radiating amount, the conversion unit is connected with the detection unit and the calculation unit, and is used for converting the difference value into a heat radiating signal, and converting the breathing frequency and / or body temperature into a body function signal, and the sending unit is connected with the conversion unit, and is used for sending the heat radiating signal and / or the body function signal to the outside. By adopting the technical scheme, the running temperature of the air conditioner is adjusted according to the detected body condition information of the user, so the temperature adjusting of the air conditioner is more accurate, and then the temperature is suitable for different populations with different body conditions.

The invention relates to an early warning method against vehicle collision based on an electronic map. The method comprises that 1) GPS data, which comprises movement station information and position information, of a vehicle is obtained, and the position information of the vehicle is converted by a coordinate system and mapped into a two-dimensional rectangular coordinate system; 2) according to historical GPS data of the vehicle, the present position information of the vehicle is optimized in a Kalman filtering algorithm to predict a first present position of the vehicle; 3) according to the historical GPS data of the vehicle, information of the electronic map is combined to predict a second present position of the vehicle; 4) the first present position and the second present position of the vehicle are combined to predict the optimal position of the vehicle; and 5) the predicted optimal position of the vehicle is combined with a TCC algorithm to make early warning against collision. Compared with the prior art, whether the vehicle possibly collides with vehicles in the surrounding is predicted in real time, early warning is given to a driver in real time, the driving safety and the vehicle positioning precision are effectively improved, and the method is practical and efficient.

The invention relates to the technical field of navigation systems, in particular to a portable blindman independent navigation system. The portable blindman independent navigation system is a main glasses body, which comprises a glasses framework, pinhole cameras arranged on both sides of the main glasses framework, a GPS (Global Position System) arranged in the middle of the main glasses body, earphones arranged at the tail ends of the glasses framework and embedded hardware systems arranged in lenses of the main glasses body; wherein the embedded hardware systems arranged in the lenses of the main glasses body comprise extension ports, ARM (Advanced RISC Machines, RISC is short for Reduced Instruction-Set Computer) systems, videos, ARM inner cores, DSP (Digital Signal Processor) inner cores, FPGs and Linux real-time operation systems. In the portable blindman independent navigation system, the embedded systems are used for carrying out three-dimensional information extraction on binocular images acquired by the pinhole cameras, a built-in navigation map and GPS information are used for comparison to acquire relevant information of positions, directions, front barriers and the like and converting results into voice signals to inform blindmen.

The invention discloses a forest fire positioning and alarming system based on a wireless sensor network, which relates to the field of wireless transmission and fire monitoring. The forest fire positioning and alarming system consists of a terminal node and a convergence node, wherein the terminal node consists of a coordinator node, a router node and an acquisition node. The invention further discloses a forest fire monitoring, finding, positioning and alarming method based on the wireless sensor network and a terminal node arrangement method. A sensor of the terminal node is used for monitoring a forest environment and a fire extinguishing point. The system has the advantages that: the wireless sensor network is applied to forest fire prevention, an origin of fire is positioned according to the characteristic of any terminal node in the wireless sensor network, and all nodes in the entire network have monitoring and positioning functions. According to the advantages of zigbee and embedding, a fire positioning and alarming system with low cost, low power consumption and high interference resitance is established.

The invention relates to an unmanned plane load device with a real-time wireless high-resolution image transmission function, which comprises a digital camera module, a control processing module, a power supply module, as well as a high-speed image acquisition and coding module and a data transmission transmitter module, wherein the digital camera module is used for photographing a region to be inspected or mapped; the control processing module is used for completing the management control, data processing and system configuration of each functional module; the power supply module is used for powering devices; the high-speed image acquisition and coding module is used for processing and transmitting high-resolution images, acquiring original image data via a high-speed LVDS (Low Voltage Differential Signaling) interface of the digital camera, compressing and coding images to form an image code stream via a wavelet compression unit, and packing, framing and transmitting to the transmitter module via the control processing module; and the data transmission transmitter module transmits the data processed by the control processing module by adopting microwave to a ground station to increase the bandwidth of data transmission. The device is low in cost, good in real time performance, high in reliability, flexible in configuration, visual and convenient.

The embodiment of the invention discloses a method and device for updating bus line data and relates to the technical field of information processing. The improvement on the real-time performance of updating the bus line data and the accuracy of updating station and line attribute information is realized. The method comprises the following steps: when a bus is positioned at a starting station, GPS (Global Positioning System) equipment on the bus receives and acquires the attribute information of a line of the bus, which is preset by acquisition personnel; when the bus starts to operate, the GPS equipment starts to acquire a running line track of the bus; when the bus arrives at a stop station, the GPS equipment receives and acquires the position and the name of the stop station, which are marked by the acquisition personnel; the GPS equipment generates a station number corresponding to the stop station, and a city and a compartment to which the stop station belongs; and when the bus arrives at a terminal station, the GPS equipment uploads a data packet of the line of the bus to a data processing server. The method and the device which are disclosed by the embodiment of the invention are mainly applied to processing of updating of the bus line data.

The invention relates to the technical field of data updating, and discloses a cold and hot data storage method and device and an electronic device. The method comprises the following steps: backing up hot data in a hot database to a cold database; wherein the hot database is used for storing hot data, and the cold database is used for storing cold data; wherein the hot data is data with the dataaccess frequency greater than or equal to the preset access frequency within the target time length, and the cold data is data with the data access frequency less than the preset access frequency within the target time length; judging whether target hot data converted into cold data exist in the hot database or not; and if the target hot data exists, deleting the target hot data from the hot database. According to the embodiment of the invention, the hot database with high real-time performance and high cost can store the hot data frequently accessed by the nodes, and the cold database with low real-time performance and low cost can store the cold data which are not frequently accessed, so that the storage cost is greatly saved, and the access utilization rate of the data is ensured to themaximum extent.

The invention discloses an automatic test method for a directional diagram of a short-wave large-scale antenna array. The method includes the following steps: (1) 2D<2> / Lambda is used as a minimum test distance, wherein R is a distance between a to-be-tested antenna and a signal source, D is a maximum aperture of the antenna array and Lambda is a work wavelength; a test track is concentric circles which rise gradually with radiuses being reduced gradually; (2) test field intensity data and space GPS orientation data are combined and interferences and noise signals are removed and then through an algorithm, an overall directional diagram is calculated in an inversion manner. In the automatic test method, the whole system adopts a radio communication means to carry out whole-journey remote control on a test process so that test efficiency is improved and a function which cannot be achieved by the prior manual tests is realized; and at the same time, intervention of an automation device reduces errors caused by the manual tests and the accuracy and precision are improved.

The invention discloses an anti-interference method of a satellite navigation receiver. The method includes: firstly, setting an array for lineup; receiving signals through an array antenna and processing the signals; conducting delay processing to the signals; obtaining a reference channel and a surplus reception channel; setting a weight parameter for filtering; conducting error estimation to obtain an error parameter; selecting a step length factor for weight updating; repeating until an algorithm enters a steady state convergence point to obtain a weight of the steady state convergence point; utilizing the weight to filter the signals so as to obtain the signals after anti-interference; sending digital signals after anti-interference processing to a rear-end for processing, or sending the digital signals to a DA (digital to analog) converter to be converted to analog signals for outputting. The anti-interference method of the satellite navigation receiver is small in calculation amount, is favorable for a project to be realized, and is small in data processing capacity, and fine in instantaneity, steady state and anti-interference effect.

The invention discloses a fuzzy fusion method for force feedback of a vascular intervention surgical robot, belonging to the technical field of medical devices. The fuzzy fusion method comprises the following steps: selecting fuzzy linguistic variables; constructing a membership function and calculating a quantifying factor and a scale factor; establishing an assigned table; drawing up a fusion rule table; and performing the step of fuzzy reasoning. According to the fuzzy fusion method disclosed by the invention, fuzzy control is applied, and the non-linear relationship between the two can be well reflected by applying a logical relation between the fuzzy variables; and the linguistic variables are defined according to the personal understandings of a doctor, the input variables are used for reflecting the collision state, the output is of feedback force, and the actual relation can be reflected by the two more realistically by combining with the existing experience of the doctor.

The invention discloses a redundancy switching method among redundancy process control stations in a distributed control system, comprising the following steps of: implementing data synchronism among the redundancy process control stations via a redundancy network; respectively connecting each process control station and each engineer station to a switchboard via a network; sending heartbeat signals to the process control station in a standby state by the process control station in an activate state; setting up a system variable by the process control station; modifying the data of the system variable by the process control station in the activate state whenever executing a control logic; synchronizing the data of the system variable to the process control station in the standby state via a private network by the process control station in the activate state when synchronizing data to the process control station in the standby state; and judging whether the data of the variable in the synchronized data is the same with the last received one or not by the process control station in the standby state and judging whether the process control station in the standby state is activated. Through the method disclosed by the invention, the reliability of switching process control stations is improved.

The invention discloses a motion trajectory planning method and device, a robot and a storage medium. The method comprises the following steps: a previous operation time length and a previous set transition time corresponding to a previous target trajectory point are obtained; if the previous operation time length is different from the previous set transition time, a continuous next target trajectory point is determined after the previous target trajectory point; and a motion trajectory of the robot moving to the next target trajectory point is planned according to motion information corresponding to the previous target trajectory point and the next target trajectory point. The method can effectively join the motion trajectories of the robot moving among continuous trajectory points to effectively guarantee smooth transition of the motion trajectories of the robot moving among the continuous trajectory points under the precondition of guaranteeing low calculation quantity and instantaneity, so that the working efficiency and the stability of the robot in the working process are improved.

The invention relates to a thrust allocation method and device for a miniature underwater robot vector layout thruster. The method comprises the following steps of: taking a thrust allocation energy consumption matrix of the vector layout thruster as a basis for calculating thrust; calculating a thrust allocation result with the minimum energy consumption through a extreme value theory; removing abnormal data through a peak value removal method and obtaining a control voltage for the thruster in a normal range; and converting the allocation result obtained through calculating into an actual control voltage by a thrust / voltage conversion method. The device comprises a control signal generation unit, a microcontroller and a voltage output unit; the control signal generation unit generates a voltage control signal and outputs the voltage control signal to the microcontroller; the microcontroller processes the voltage control signal, generates an actual voltage control signal, and outputs the actual voltage control signal to the voltage output unit; and the voltage output unit applies the actual voltage control signal to the robot vector layout thruster. With the adoption of the thrust allocation method and device for the miniature underwater robot vector layout thruster, the safe operation of a system is ensured, and the energy consumption of the system can be effectively lowered under the condition that the control effect is ensured.

The invention discloses a vehicle-mounted wheel set flaw detection method and system. The wheel set flaw detection method comprises the steps that coupling water is sprayed between ultrasonic probes pre-installed on a locomotive and detected portions on wheels under control of wheel set flaw detection signals, the ultrasonic probes are controlled to emit ultrasonic signals and collect ultrasonic signals returned by the detected portions on the wheels, and flaw detection results of the wheels are determined according to the ultrasonic signals collected when the wheels revolve one round. The wheel set flaw detection system comprises a cab unit and a bogie unit; the cab unit comprises an ultrasonic detector and a flaw detection controller, the bogie unit comprises a coupling water spraying unit and an ultrasonic probe assembly, and the ultrasonic probe assembly comprises the ultrasonic probes. The vehicle-mounted wheel set flaw detection system can be pre-installed on the locomotive when a locomotive vehicle leaves a factory and has the advantages that detection is fast and efficient, later line construction is not needed, the flaw detection range is wide, all the portions, needing to be detected, of the wheels can be covered, the cost is lower, and the wheel set health state can be detected at any time in the running process of the locomotive.

The invention provides an SIFT image feature point extraction method based on the Canny operator and Hilbert-Huang transform, and relates to the field of image processing. The method is an improved method for SIFT image feature point extraction based on the Canny operator and Hilbert-Huang transform. The method employs a technical scheme of the fusion of the Canny operator and Hilbert-Huang transform, irons out the defects that a conventional SIFT algorithm is not good in instantaneity, the number of feature point is smaller sometimes and the feature points of a target with the smooth edge cannot be extracted, can effectively improve the anti-noise capability of the SIFT feature points, improves the stability of an algorithm, and provides a good basis for the three-dimensional reconstruction and target positioning.

The invention discloses a transformer substation operation field monitoring device based on deep learning. The transformer substation operation field monitoring method comprises enabling a field monitoring person and an operation person to enter a transformer substation operation field monitoring program; selecting and confirming the first operation step by the field monitoring personnel, and executing the monitoring work; enabling the camera to collect a field operation video file and convert the field operation video file into an RGB image; loading improved deep neural network YOLO-V3; inputting an image, automatically identifying the equipment and the identifier, and judging whether an operation behavior conforms to a safety specification or not; according to the recognition and judgment result, giving an alarm on site, and giving an evaluation result; visually displaying the identification and evaluation results to on-site monitoring personnel in real time; and enabling the field monitoring personnel to confirm the evaluation result and select to enter the next step or end the operation. Two deep neural network lightweight methods of model structure pruning and weight quantification are used, high-precision real-time inference of the deep neural network model in the embedded intelligent terminal is realized, and safety and efficiency are improved.

The invention belongs to the fire positioning field, particularly relates to a fire positioning method on the basis of smoke concentration, is on the basis of a wireless sensor network and carries out positioning estimation on a fire source point through utilizing smoke concentration acquired by the concentration sensor on the basis of a smoke diffusion model. The method comprises steps that 1, the smoke diffusion model under the no wind environment is established, and a relationship between gas concentration under the no wind condition and a distance is determined; 2, on the basis of weight fusion of the gas concentration and a least square method, a fire source zone is positioned; 3, on the basis of a K-means cluster method, cluster analysis on the fire source zone positioned in the step 2 is carried out, and a fire source point is determined. The positioning method is applicable to conditions that a fire is at an early stage, a roof is flat, a wind speed is relatively small, and only a single fire source point exists, a smoke flow is taken as a two-dimensional plane, through the fire positioning method, a place below the zone of a positioning result is taken as a fire generation zone. The fire positioning method has advantages of low energy consumption, timeliness, low cost, interference resistance and strong practicality.

The invention discloses an emergent vehicle brake early warning system which comprises a CAN bus, a central processor, a data fusion module, a GPS positioning module and a special short-distance communication transmitting-receiving end. The state information of a former vehicle can be actively acquired, and furthermore, with the combination of the state information of a vehicle of a user, a brake early warning signal can be judged and reminding can be output, so that collision accidents happening in emergent braking of vehicles can be avoided, and an active protection function for safe driving can be achieved. By adopting the emergent vehicle brake early warning system, the limits that a conventional distance detection sensor is short in measurement distance, small in detection angle and great in obstruction influence of a barrier can be broken through, the position information of the former vehicle and the vehicle of the user is acquired by using the GPS positioning module, real-time communication between vehicles is achieved by virtue of a DSRC special short-distance communication technique, a brake early warning signal can be judged, and a brake early warning function can be achieved.

Provided is a web system development reusable method based on AnGo dynamic evolution model. The method comprises the steps of step1, establishing a dynamic evolution model based on the AnGo, step 2, conducting the web system development reusable method, which entails the following procedure of step 2.1, using meta Agent self-update mechanism to register the meta Agent with basic function to AgentCluster, or canceling the already-abandoned meta Agent from the AgentCluster, step 2.2, using the inert loading mechanism to load WRDLPooL configuration information, step 2.3, the front end sending a request, based on the configuration information, sieving and selecting corresponding meta Agent from AgentCluster, assembling in AgentChain, and executing decision Agent in order. The web system development method is reusable, thus being able to enhance software programming efficiency, greatly reducing manual coding of server end, and enhancing software development quality.

The invention relates to the technical field of water turbine runner blade defect detection, and particularly discloses a water turbine runner blade defect detection method based on a YoloV4-Lite network, and the method comprises the steps: S1, constructing a defect detection network based on the YoloV4-Lite network; S2, performing picture collection on different defect positions of the turbine runner blade to obtain thousand or more defect pictures; S3, preprocessing the defect picture acquired in the step S2 (processing by using LabelImg software according to a Pascal VOC 2012 format) to obtain a data set; and S4, training, testing and verifying the defect detection network by adopting the data set. According to the invention, the backbone extraction network CSPDarkNet53 network of YoloV4-Lite is replaced by the MobileNet network, and the MobileNet network is a real-time lightweight network, so that the network detection speed can be improved, and the network parameters can be greatly reduced. Experimental results show that the accuracy rate of the defect detection network can reach 97.48%, the network parameter quantity of the MobileNetV3 only needs 37.35 MB and is reduced by 206.94 MB compared with that of CSPDarkNet53, the FPS reaches 44.68, and the method has the advantages of being high in accuracy rate, low in memory storage and real-time.

The invention discloses an outdoor suspended automatic lifting telescopic clothes hanger which comprises a telescopic bracket, a fixed shell, a first clothes hanging rod, a second clothes hanging rod as well as a first motor, a second motor, a third motor, a main controller and a control device, wherein the fixed shell is fixed on an outdoor wall through the telescopic bracket; the first clothes hanging rod is positioned below the shell and is connected with the fixed shell through the lifting mechanism; the second clothes hanging rod is suspended on the first clothes hanging rod and is rotationally connected with the first clothes hanging rod; the first clothes hanging rod comprises a rotating groove and a sliding groove; a plurality of windproof clothes hanging rings and a power pulley are movably fixed on the sliding groove. The outdoor suspended automatic lifting telescopic clothes hanger is very well applicable to outdoor natural environments, is high in automation degree, is capable of bringing much convenience to people to hang and withdraw clothes and quilts through transverse stretching and withdrawing and longitudinal lifting of the clothes hanging rods and overall stretching and withdrawing of the windproof clothes hanging rings, and is wide in applicability.

The invention provides a circle detection method based on data stationarity. The method comprises the following steps of step1, through image preprocessing, acquiring an arc contour of a single pixel width; step2, using three different points on the arc contour of the single pixel width to determine a position of a theory circle center; step3, calculating distance data from each possible circle center to each pixel point on the arc contour of the single pixel width; step4, searching an actual circle center and an actual radius, wherein after the actual circle center is acquired, a mean value of the distance data corresponding to the actual circle is a radius of the circle. By using the method, an occupation memory is less and a calculated amount is less too; and real-time performance and algorithmic accuracy are high.

The invention relates to the technical field of data processing, in particular to a data migration method based on message-oriented middleware and related equipment, and the method comprises the steps: extracting to-be-migrated data from a source database, and writing the to-be-migrated data into first-stage message-oriented middleware of a message-oriented middleware cluster; carrying out streaming computation processing on the to-be-migrated data and then transmitting the to-be-migrated data to the secondary message middleware; judging whether a data asynchronous landing requirement exists or not according to the next-level connection of the secondary message middleware; when the secondary message middleware exists, transmitting the data to be migrated to an intermediate database connected with the secondary message middleware, and the data falling into a target database in an ETL mode; and when the to-be-migrated data does not exist, performing streaming computation processing on the to-be-migrated data, transmitting the to-be-migrated data to subsequent cascaded message middleware, and the to-be-migrated data falling into a target database. According to the method, the middleware is constructed to serve as an intermediate bridge of data migration, so that the data falls from the source database to the target database, and the method has the advantages of high real-time performance, low time delay and high transmission rate.

The invention relates to a gas valve pit leakage monitoring terminal, which is characterized by mainly comprising an I / O (input / output) port, a 16-bit RISC (reduced instruction set computer) core, an RAM (random access memory) / ROM (read only memory), an A / D (analog / digital) converter, a temperature monitoring signal conditioning unit, a water level detecting probe, an equipment abnormality monitor, an infrared spectral component analyzer and a mounting area water level and gas sampling unit. The gas valve pit leakage monitoring terminal has the advantages that by combining with the wireless GPRS (general packet radio service) transmission technology, low-power-consumption control technology, anti-theft alarming technology and gas leakage detecting technology, manual polling manner for preventing gas leakage of pipelines is changed into a modern automatic manner of day-and-night real-time monitoring, and accordingly, preventing and alarming capacity for leakage of the gas network of the whole city can be perfected and improved, and harm caused by gas leakage accidents is reduced. Besides, the gas valve pit leakage monitoring terminal has the advantages of high automation degree, simplicity and convenience in maintenance and repair, low cost and the like.

The invention provides a decision-making potato late blight prevention and control system and method and relates to the field of decision-making potato late blight prevention and control. The decision-making potato late blight prevention and control system and method aims at solving the problems that pesticides are abused, planting species of potatoes are single, only the influence on late blight germs, of environmental factors, is considered during disease prevention and control and data acquisition, transmission and release are not in time. The decision-making potato late blight prevention and control system consists of a multi-point synchronous wireless acquisition and transmission module, a decision-making early warning module, a data browsing and issuing module, a user management module and an infection curve definition module. The decision-making potato late blight prevention and control method for the system comprises the following steps of 1 obtaining an available output signal of meteorological data; 2 monitoring and collecting images; 3 transmitting the data to a mobile phone browse monitoring system and a potato late blight Web decision-making supporting system sub-module; 4 obtaining a disease development curve and determining the potential severity degree of disease occurrence; 5 releasing decision-making early warning information; 6 releasing decision-making early warning result information; 7 performing data disposal and statistics. The decision-making potato late blight prevention and control system and method is applied to the field of decision-making potato late blight prevention and control.

The invention discloses a message real-time pushing method based on an MQTT protocol. The message real-time pushing method comprises the following steps of (1) subscribing and authenticating a clientand a pushing management end; (2) enabling the client to return the authentication certificate and the link address of the push server to the client, and enabling the client to establishe a message push link with the push server; (3) enabling the client to select a theme for subscription, and after receiving a subscription request, enabling the push management end to start or use an existing message release task for message filtering and cleaning to generate a to-be-pushed message of the client and store the to-be-pushed message into a to-be-pushed message pool; and (4) monitoring the messagepool to be pushed by the pushing server, and automatically pushing the new message conforming to the subscription theme of the client to the client to complete the real-time pushing of the message. According to the invention, the server is divided into the pushing management end and the pushing server according to the functions, so that the pressure of the pushing server is reduced while the client receives the message in time.

The invention relates to an excitation control method of a doubly-fed wind-driven generator. The doubly-fed wind-driven generator has a doubly-fed motor. The motor includes: a stator, which supplies power for a power grid having a voltage with a rated value; and a driving rotor, which is coupled with the stator. One end of the rotor is connected with a wind turbine by a change-speed gear. A rotor winding is a three-phase wound rotor winding. The power grid supplies power for the rotor by a current transformer; and a stator voltage and a stator linkage are deposed on an xsynchronization rotation dq coordinate axis; therefore, it can be realized that power output by the generator stator is controlled by adjusting the rotor current. According to the method provided in the invention, there is no need to carry out complex conversion and calculation like vector rotation changing and the like; active and reactive decoupling control can be realized; a current control module has low control sensitivity; a circuit parameter and measurement time delay of a current transformer system has a little influence on current control; and the control technology is simple and thus cost of the controller is reduced.

The invention relates to a control method of reactive power of a doubly fed wind power generator. The doubly fed wind power generator comprises a doubly fed motor, wherein the motor comprises a stator and a driving rotor, and the stator supplies power to a grid; the grid has rated voltage, and the driving rotor is coupled with the stator; one end of the rotor is connected to a wind turbine through a transmission gear, and a rotor winding is a three-phase wound rotor winding; and the grid supplies power to the rotor through a converter, and stator voltage and stator flux are decomposed onto a synchronously rotary dq coordinate axis to control the reactive power output by the generator stator by adjusting the current of the rotor. In the method, no complex transformation and calculation of vector rotation change and the like are needed, the control sensitivity of a current control module is lower, the circuit parameters and the measurement delay of a converter system have smaller impacton current control, and the control technology is simple, and thereby the cost of a controller is also reduced. The control method is suitable for application of a low-power wind power generator.