351 results about "Secondary loop" patented technology

The present disclosure belongs to the technical field of health status assessment of secondary circuits in power systems, and specifically relates to an image recognition method for a secondary circuit terminal based on contrastive learning and an improved CRNN. The method includes: step 1: pre-training sample data of a secondary circuit terminal block of a power system through the contrastive learning; step 2: improving a feature extraction layer of a CRNN by using a residual neural network; and step 3: introducing an ECA-Net on the basis of the step 2 to construct a recognition model for the secondary circuit terminal based on the contrastive learning and the improved CRNN. In the method of the present disclosure, an image of the secondary circuit terminal block can be accurately recognized, and the accuracy of image recognition, detection accuracy and detection efficiency can be greatly improved.

The invention relates to the technical field of nuclear reactor safety, and particularly discloses a reactor waste heat export, recovery and comprehensive utilization system and method based on a heat pipe, and the system comprises a nuclear energy generation system, a secondary loop energy conversion system, a primary loop waste heat discharge system, a secondary loop waste heat discharge system, and a waste heat recovery and comprehensive utilization system. According to the waste heat recycling system, the heat pipe can be used for heat transfer and storage under the peak regulation operation condition, the nuclear heat use efficiency is remarkably improved, the requirements of various types of energy sources such as electricity and heat are met, and passive export of reactor core waste heat can be achieved through multi-natural-circulation coupling cooperative operation under the condition of a whole-field outage accident. By means of the efficient heat transfer characteristic and the modularization characteristic of the heat pipes, independent operation of the heat pipes can be achieved, the problem of single-point failure of the system can be avoided, meanwhile, separation of a reactor coolant and a cooling medium of a waste heat removal system can be achieved, the inherent safety of a nuclear reactor is remarkably improved, and the requirements of multi-purpose scenes are met; and the purpose of fully utilizing resources is achieved.

Embodiments of the invention provide a high density liquid cooling system including a rack, primary loop piping including a primary inlet, a primary outlet, a primary loop filter, and a primary bypass valve, and secondary loop piping including a secondary inlet, a secondary outlet, a first pump, a first filter downstream of the first pump, and a secondary bypass valve. The system includes a heat exchanger having a first side and a second side. When the primary bypass valve is open, at least a portion of the fluid in the primary loop piping flows through the primary inlet and the primary outlet without traversing the heat exchanger, and when the secondary bypass valve is open, at least a portion of the fluid in the secondary loop piping flows through the secondary inlet and the secondary outlet without traversing the heat exchanger.

A thermal conditioning system including a heat-transfer circuit, a refrigerant circuit including successively: a compressor, a first bi-fluid exchanger and a second bi-fluid exchanger arranged jointly on the refrigerant circuit and on a main loop of the heat-transfer circuit, a first expansion valve, a third bi-fluid exchanger arranged jointly on the refrigerant circuit and on a secondary loop of the heat-transfer circuit, a first branch of the heat-transfer circuit being configured so that the heat-transfer liquid leaving the first bi-fluid exchanger returns to the first bi-fluid exchanger without passing through the second bi-fluid exchanger, and including a second heat exchanger configured to exchange with a second air flow. A second branch connects the first branch to the main loop, and includes a third heat exchanger configured to exchange with the second air flow.

The invention discloses a cascade control method and system for the alum adding process of a waterworks. The cascade control method comprises the steps that preprocessed operation data of the waterworks are obtained; according to the preprocessed operation data, on the basis of a pre-trained LSTM-Transformer prediction model, an alum adding amount prediction value, an effluent turbidity prediction value and a sedimentation velocity prediction value at the current moment are obtained; segmenting the alumen ustum image based on an SAM algorithm, extracting features by adopting OpenCV, and calculating a settling velocity; based on feed-forward-feedback compound control, the feed-forward control adjusts the alum adding amount in time by monitoring the change of the quality of raw water, a main loop of cascade control predicts the water turbidity through MPC to calculate the optimal set value of the settling velocity, an auxiliary loop calculates the alum adding amount through the settling velocity, the feed-forward control and cascade control are subjected to decentralized summation, and the alum adding amount is calculated according to the optimal set value of the settling velocity. And calculating the final addition amount of the alum. According to the invention, the dosage of alum can be regulated and controlled more accurately.

The invention discloses a zero-sequence current acquisition and analysis device and method for a power secondary circuit, and belongs to the field of power systems. The device comprises a current transformer, a temperature sensor, a front-end analog filter, an ADC, a rear-end digital filter, a self-adaptive wave trap, a processor and an alarm. Wherein the output end of the current transformer is connected to the processor through the front-end analog filter, the ADC and the rear-end digital filter in sequence; and the processor is also respectively connected with the temperature sensor and the alarm. According to the invention, real-time acquisition and early warning of the zero-sequence current are realized, and high precision and stability of an acquisition result in a full temperature range are ensured at the same time.

The invention relates to a secondary loop heat management control method and a vehicle. The secondary loop heat management control method and the vehicle are used for meeting different water inlet temperature requirements on the two sides as much as possible when a passenger compartment and a battery both have cooling requirements. The method comprises the steps that when it is recognized that a passenger compartment and a battery have refrigeration requirements at the same time, the target air outlet temperature of a cold air core, the battery cooling request temperature, the actual air outlet temperature of the cold air core and the actual temperature of a battery inlet are obtained; determining a compressor target rotating speed; according to the first temperature difference between the target air outlet temperature of the cold air core and the actual air outlet temperature of the cold air core, the opening change value of a first three-way valve is determined; determining an opening upper limit value of a first three-way valve and a target rotating speed of a first water pump according to a second temperature difference between the battery refrigeration request temperature and the actual water inlet temperature; the rotating speed of the compressor is controlled according to the target rotating speed of the compressor, the rotating speed of the first water pump is controlled according to the target rotating speed, the opening degree of the first three-way valve is adjusted according to the opening degree change value, and the adjusted opening degree is smaller than or equal to the opening degree upper limit value.

The invention discloses a method for determining the feed water flow of an evaporator of a nuclear power station and a related device, and relates to the technical field of thermoelectric conversion, and the method comprises the steps: obtaining the steam flow of an outlet of the evaporator, the secondary loop pressure of the evaporator, and the feed water temperature and nuclear power of an inlet of a main water supply pipe; the specific enthalpy coefficient is determined by looking up a table according to the secondary loop pressure of the evaporator and the feed water temperature, and the specific enthalpy coefficient is the ratio of the steam specific enthalpy to the feed water specific enthalpy; the nuclear power is converted into theoretical steam flow, the theoretical steam flow is used for verifying the steam flow of an evaporator outlet, and if verification passes, the steam flow of the evaporator outlet is used as one of the inputs of the feed water flow soft measurement model; and inputting the specific enthalpy coefficient, the steam flow at the outlet of the evaporator and the secondary loop pressure of the evaporator into a water flow soft measurement model to obtain the theoretical feed water flow. According to the method, high-precision dynamic measurement and calculation of the water supply flow of the evaporator are realized based on the water supply flow soft measurement model.

The invention discloses a switch cabinet partial discharge and temperature anomaly real-time monitoring method and system, and the method comprises the steps: S1, cooperating with a plurality of power enterprise nodes through a federated learning server, carrying out the combined training of a double-branch fault recognition model under the condition of protecting data privacy, and generating an initial strategy mapping library of related fault information and linkage strategies; s2, deploying the model in an edge computing device, performing cross-model fault identification on real-time monitoring data, and matching a corresponding linkage instruction from a strategy mapping library when the confidence coefficient meets a condition; s3, issuing the linkage instruction to the secondary loop equipment for execution, and collecting execution effect data as linkage feedback data; and S4, the linkage feedback data is processed and transmitted back for triggering iterative training of the fault identification model and strategy parameter updating of the strategy mapping library. According to the invention, closed-loop intelligent monitoring from fault identification and accurate linkage to strategy self-optimization is realized.

The invention discloses a nuclear power plant distributed control system and control method, and relates to the technical field of nuclear power plant digital control, and the method comprises the steps: a global optimization layer generates a cross-unit general control strategy library based on a transfer learning algorithm according to the decision period of the global optimization layer; when the coordination control layer operates by using the transferable control strategy corresponding to the unit equipment where each two-loop subsystem is located, the corresponding two-loop subsystem control weight is dynamically allocated based on the multi-agent attention network according to the decision period of the coordination control layer; when the execution control layer operates by using the dynamically distributed two-loop subsystem control weight, the first-loop temperature, the first-loop pressure and the coolant flow are obtained according to the decision period of the control layer, a safety constraint matrix is calculated through a safety manifold projection module, and a quadratic programming problem with a relaxation factor is solved; and the corrected control weight of the two-loop subsystem is obtained and converted into a control instruction to be issued to a DCS field control station.

The invention provides a grain multi-group decoupling prediction method, a modeling method, equipment and a storage medium. The modeling method comprises the following steps: providing a training database; extracting a feature library; training a secondary loop model, and outputting a first component prediction result; training a main loop model; and iteratively training the secondary loop model and the main loop model to obtain a grain multi-group decoupling prediction model. The method not only corrects a spectral reflection value, but also constructs a closed-loop prediction mechanism based on a first component state, dynamically screens wavebands, establishes an internal and external double-closed-loop cascade architecture of a main loop and an auxiliary loop, continuously adjusts parameters and updates a feature library, thereby realizing systematic suppression of interference signals and enhancement of intrinsic features of a second component. An interpretable feature screening mechanism is introduced, the importance of each wave band is evaluated in real time, the combination of a data-driven model and spectral physical prior is realized, and the problem that the generalization performance is reduced due to the fact that the model depends on shortcut features in the training process is avoided.

The invention discloses a transformer substation secondary circuit drawing intelligent processing method and system, belongs to the technical field of electric power system digitization, and aims to solve the problems that the missing detection and false detection rate of old fuzzy drawings is high, a deep learning model lacks topological semantic understanding, full-process automation is insufficient, and structural management is lacked in conventional secondary circuit drawing processing. According to the core scheme, the method comprises the steps of segmenting an image through a U-Net network to generate masks, generating a structured topology table in combination with a primitive database, converting the structured topology table into nodes and directed edges with electrical attributes, constructing a queriable graph database integrating version management, rule check and a layout optimization algorithm, and finally generating a standard format drawing. According to the scheme, the primitive recognition and topology analysis precision is improved, deep mapping from images to electrical logic is achieved, full-process automation is achieved, version tracing and rule verification are supported, and standardized drawings are produced.

The invention discloses a complete-cycle health maintenance method, system and device for secondary circuit equipment and a medium, and the method comprises the steps: obtaining the operation data of the secondary circuit equipment, and dividing the operation data into an initial data set and an incremental data set; constructing an initial health prediction model by using the initial data set, and predicting the residual service life of the secondary circuit equipment; according to an incremental learning algorithm, updating the initial health prediction model by using an incremental data set to obtain an updated health prediction model; and performing health state evaluation and residual service life prediction on the secondary circuit equipment by using the updated health prediction model, thereby realizing complete-cycle health maintenance of the secondary circuit equipment, automatically adjusting an incremental learning strategy according to the change of an equipment operation environment, and improving the adaptability of the system.

The invention provides a CT secondary circuit verification system and method, and the system comprises an alternating current source which is used for injecting a test current into a CT secondary circuit; the at least one current measuring device is used for measuring current values of different branches in the CT secondary circuit; and judging the wiring correctness of the CT secondary circuit by comparing the current values of the different branches. According to the invention, the efficiency of acceptance inspection and regular verification of the relay protection loop can be greatly improved, and a powerful guarantee is provided for safe and reliable operation of a power system.

The invention relates to the technical field of data center heat management, and particularly discloses a double-loop heat recovery immersed data center cooling system, which comprises an immersion cooling cabin, a heat recovery module, a heat recovery module, a heat recovery module and a heat recovery module, wherein the immersion cooling cabin is used for installing a server circuit board in an immersion manner; the cooling liquid circulating system is used for removing core heat of the server; a main circulating loop is formed by a variable-frequency circulating pump, a precision filter, a cooling liquid conveying valve, a spraying device, an immersion cooling cabin, a cooling liquid return valve and a refrigerating unit which are connected in sequence; the waste heat recovery cooling system is independent of the main loop and is connected to the heat storage tank through a heat exchange pipe immersed in cooling liquid, a waste heat adjusting valve and a water pump to form a secondary loop for extracting medium and low temperature waste heat; and the intelligent regulation and control module is used for collecting data and outputting a control instruction. According to the system, through immersed direct heat exchange and independent double-loop design, cooperation of server core heat dissipation and waste heat recovery is achieved, and the heat dissipation efficiency and the energy comprehensive utilization level are improved.

According to the integrated thermal management method for the secondary circuit of the new energy automobile, mechanical abrasion or electrical faults are accurately recognized by monitoring the rotating speed and the current signal of the main water pump in real time, and the standby water pump is rapidly switched to guarantee circulation continuity of cooling liquid; meanwhile, the opening degree of the electric control valve is dynamically adjusted to optimize flow distribution of each branch, and the temperature of the battery is maintained in a safe interval in combination with multi-point temperature data fusion processing; in addition, by means of branch isolation and bypass channel switching, local faults can be handled in time, and the overall cooling capacity is maintained. According to the invention, the stability and safety of the thermal management system in multiple scenes are obviously improved.

The device comprises a to-be-disassembled electric energy meter, an electric energy meter replacing module detection box and a junction box, the to-be-assembled electric energy meter is placed on one side of the to-be-disassembled electric energy meter, and electric energy meter wire inserting ends are arranged on the inner side of the to-be-disassembled electric energy meter; the inner side of the electric energy meter wire plugging end is provided with a connecting wire, and the bottom of the connecting wire is connected with a junction box. The top of the junction box is covered with an electric energy meter replacement module detection box; the electric energy meter replacement module detection box has auxiliary functions of voltage monitoring, current monitoring, contact temperature monitoring, contact pressure control, overvoltage protection, current loop open circuit prevention, reliable wiring detection and the like. By using the device, an old electric energy meter needing to be dismounted and a new electric energy meter to be replaced are simultaneously connected in a metering secondary loop, the two meters operate simultaneously, numerical values are combined for metering, the purpose of continuous electric quantity metering in the meter replacing process is achieved, and the problem of electric energy metering loss is effectively avoided.

The invention discloses a fault monitoring method and system for a primary and secondary fusion pole-mounted circuit breaker, and relates to the technical field of fault monitoring, and the method comprises the steps: collecting and obtaining an electrical data sequence and a control signal data sequence; traversing the electrical data sequence to perform primary loop original feature extraction, and determining a primary loop original feature set; performing secondary loop derivative feature extraction on the control signal data sequence to obtain a secondary loop derivative feature set; dual inconsistency synchronous verification is carried out on the primary loop original feature set and the secondary loop derivative feature set, a target fault monitoring result is obtained, and the dual inconsistency synchronous verification comprises synchronous verification of feature distribution inconsistency verification and control feedback inconsistency verification. According to the invention, the technical problems of characteristic inconsistency and inaccurate fault identification between the primary loop and the secondary loop in the prior art are solved, and the technical effect of improving the fault monitoring accuracy and real-time performance is achieved.

The invention discloses a regional heat supply system energy-saving optimization technology based on multi-dimensional intelligent prediction and cooperative regulation, which comprises the following steps: (1) establishing a heat consumer side mathematical model of a regional heat supply system, covering a heat exchanger, a secondary pipeline, a radiator and a building envelope structure, and obtaining an indoor temperature dynamic response model; (2) collecting multi-dimensional data such as primary and secondary loop temperature, pressure, flow, valve opening and indoor and outdoor environment in real time; (3) constructing an intelligent prediction model based on CNN and FCM, optimizing hyper-parameters by using BKA, and realizing high-precision short-term prediction of the water supply temperature of the secondary loop; (4) taking a prediction result as a target, and adopting a WOA regulated PID controller to accurately regulate a primary loop flow valve; and (5) dynamically adjusting the rotating speed of a secondary side water pump according to the temperature difference of supply water and return water of a secondary loop, optimizing system heat distribution and realizing real-time load adaptation. According to the invention, the problem of disjunction of regional heat supply prediction and regulation is solved, and a new method for realizing accurate temperature control and energy conservation is provided.

The invention belongs to the technical field of power system automation and relay protection, and particularly relates to a secondary circuit abnormity alarm reverse query method and system based on drawing recognition and virtual-real mapping. Millisecond-level reverse query and drawing second-level retrieval labeling of secondary circuit abnormal warning are achieved, GOOSE, SV and MMS virtual circuits and physical circuits such as cables, optical fibers and terminal strips in the IEC 61850 environment are covered, and the problems that in the prior art, warning positioning is slow, drawing retrieval is difficult, and labeling information is lagged are solved.

The application relates to a rectifying electric control device and method for an electric desalting system, which comprises a power supply, a device electric control loop, a rectifying controller module and an on-site manual controller module; the power supply is electrically connected with the device electric control loop, the rectifying controller module and the on-site manual controller module; wherein the device electric control loop comprises a device electric primary loop and a device electric secondary loop. The application has the beneficial effect that the EDI system can realize rapid emergency shutdown after receiving a system water interruption signal, avoids the occurrence of production accidents caused by the fact that the direct current cannot be cut off in the water interruption state, realizes long-term stability of water production resistivity of the system in the remote control state through the PID adjusting function of the PLC system, reduces the workload of the operation personnel and can realize unattended operation.

The utility model provides a kind of bus duct initial end box, including main circuit component, secondary circuit component and flange unit;Main circuit component includes initial end box shell, secondary circuit component includes secondary circuit shell and secondary circuit component, secondary circuit component is independently set on initial end box shell by secondary circuit shell, hoisting structure is also provided on initial end box shell.The utility model provides a kind of bus duct initial end box by independently setting secondary circuit component on the initial end box shell of main circuit component, can make main circuit component and secondary circuit component be arranged in different box, and by setting secondary circuit component in secondary circuit shell, the effect that secondary circuit component and main circuit component and flange unit are completely isolated can be realized, realize full physical isolation;And support maintenance secondary circuit under the condition that main circuit is not power off, satisfy the rigorous power demand of data center.

This invention discloses a substation secondary circuit design method based on equipment functional areas and template matching. The method includes assigning descriptions to secondary equipment based on voltage level or bay; constructing secondary circuit data templates; matching the data template library based on the connection relationships of local equipment functional areas within a bay; extracting functional area connection information through a typical template information flow table; and converting the functional area connection information into actual equipment terminal connections to complete the substation secondary circuit design. This invention mutually converts the functional areas of secondary equipment with the design of secondary circuits, constructing data templates for substation secondary circuits. By improving the VF2 graphical matching algorithm, it achieves digital storage of data templates and rapid matching of complete bay information using local information from data templates. After matching, the functional area connections of the data templates are reverse-converted into equipment terminal connections, realizing automatic secondary circuit design and improving the digital design level of secondary systems.

The invention relates to the technical field of data processing, in particular to a secondary circuit defect intelligent detection method based on infrared temperature measurement, which comprises the following steps of: acquiring a temperature data sequence of a secondary circuit, acquiring an initial detrending component in any internal loop iteration of STL decomposition on the temperature data sequence, and calculating the initial detrending component according to the initial detrending component; carrying out fast Fourier transform to obtain a frequency domain signal, and judging whether the initial detrending component has a clear periodic characteristic or not according to the energy distribution characteristic of the frequency domain signal; if the initial detrending component does not have a clear periodic characteristic, performing seasonal correction processing on the initial detrending component to obtain a corrected seasonal component, marking the initial detrending component as an uncorrected seasonal component, and obtaining a target residual component of any internal loop iteration according to the corrected seasonal component and the uncorrected seasonal component; and repeating the target residual component acquisition method to obtain the final residual component, thereby improving the accuracy of defect detection on the secondary loop.

Temperature control system for temperature-controlling a room, comprising: a primary circuit (11); a secondary circuit; a first heat exchanger (1) with a primary side (10) and a secondary side (12), wherein the first heat exchanger (1) is configured to couple the primary circuit (11) and the secondary circuit, and wherein the primary circuit (11) is configured to extract heat from the secondary side (12) of the first heat exchanger (1) via the primary side (10) of the first heat exchanger, wherein the secondary circuit comprises: the secondary side (12) of the first heat exchanger (1); a manifold (2) which, in operation of the temperature control system, is arranged below (60) the secondary side of the first heat exchanger (1); a pump (3) which is coupled to the manifold (2);and a second heat exchanger (4) which, during operation of the temperature control system, is arranged in thermal interaction with the space (5) to be temperature controlled and is located above the collector (2); and a secondary fluid (50) which, during operation of the temperature control system, is arranged in the secondary circuit and is pressurized such that a phase change from a liquid secondary fluid to a vaporous secondary fluid takes place in the second heat exchanger (4) and a phase change from the vaporous secondary fluid to the liquid secondary fluid takes place in the secondary side (12) of the first heat exchanger (1).

The application discloses a kind of data acquisition and association method and system of substation secondary circuit, belong to substation technical field, by establishing structure topological graph and generating data label for node, using event-driven mechanism to capture the data slice of state change moment.Based on the establishment of verification task based on theoretical connection relationship, the multi-dimensional response characteristics of the node are extracted, a multi-dimensional physical constraint model integrating time dimension, electrical logic dimension and signal quality dimension is constructed, and the confidence of node connection is quantified by calculating comprehensive verification indicators.When the connection is found to be untrustworthy, the system automatically scans all network nodes to establish a temporary verification task, locates and corrects the real connection nodes, and completes the topology update.The technical problems of static label unable to track physical connection changes, passive diagnosis unable to actively prevent, and unable to automatically repair after problem discovery are solved.

The invention relates to the technical field of power system automation, in particular to a circuit breaker operating mechanism secondary circuit system suitable for a 110kV intelligent substation and a control method, the system adopts a layered architecture of a primary equipment layer, a secondary equipment layer, a station control layer and a dual-network redundant communication network, and is configured with equipment such as a high-precision sensor and a dual protection device; and equipment compatibility and data intercommunication are realized by following the IEC61850 standard. The control method comprises the five steps of state information collection, intelligent diagnosis, misoperation prevention locking, programmed operation and remote maintenance, and the operation success rate is guaranteed to be 99.99% through a dual mechanism of electrical hard contact and networked soft locking and a two-stage diagnosis mode of edge calculation and station level fusion analysis in cooperation with triple verification of programmed operation. The system solves the problems of isolated island, high misoperation risk and the like of traditional loop information, realizes full-dimensional state monitoring and predictive maintenance, adapts to the automatic and intelligent requirements of an intelligent power grid, and improves the safety and reliability of a transformer substation.

The invention discloses a mutual inductor secondary circuit defect identification method and apparatus, a terminal device and a storage medium. The method comprises the steps of obtaining a secondary voltage waveform signal of a to-be-identified mutual inductor; performing Fourier transform according to the secondary voltage waveform signal to obtain a fundamental component and a harmonic component; judging whether a harmonic amplitude condition is met or not according to the harmonic component to obtain a first judgment result; according to the secondary voltage waveform signal, determining a corresponding waveform zero point and a wave crest; according to the secondary voltage waveform signal and the waveform zero point, judging whether a waveform abnormal condition is met or not, and obtaining a second judgment result; judging whether a fundamental wave amplitude condition is met or not according to the wave crest and the fundamental wave component to obtain a third judgment result; and obtaining a secondary circuit defect identification result of the mutual inductor to be identified according to the first judgment result, the second judgment result and the third judgment result. According to the invention, the monitoring efficiency of the power system is improved.

This invention belongs to the field of nuclear power unit control technology, and discloses a method and apparatus for peak shaving in a cogeneration nuclear power unit based on secondary loop adjustment. The method includes: collecting the heat balance diagram of the cogeneration nuclear power unit; establishing mass and energy balance equations for each stage of the heaters in the secondary loop of the nuclear power unit, wherein a heat storage tank is installed in the secondary loop; converting the mass and energy balance equations into steam-water distribution equations; obtaining the extraction steam amount for each stage of regeneration in the secondary loop of the nuclear power unit based on the steam-water distribution equations; calculating the minimum and maximum turbine power through the work equations of the secondary loop of the nuclear power unit; defining the electrical load adjustment range of the nuclear power unit as less than or equal to the maximum turbine power and greater than or equal to the minimum turbine power; and performing peak shaving based on the electrical load adjustment range. This invention avoids the safety hazards of traditional nuclear power peak shaving and helps to improve the flexibility and scope of cogeneration nuclear power unit heat and power load adjustment.