177results about "Parameter calibration/setting" patented technology

The invention discloses a protection setting calculation and optimization method based on an intelligent power plant management platform, and relates to the technical field of power system protection. By constructing a platform and equipment communication link, integrally collecting and preprocessing internal and external parameters, and dynamically updating topology and model parameters in combination with a switch state, the problem that a traditional static model is difficult to adapt to operation changes is solved, the timeliness and accuracy of the model are improved, a multi-scene database is constructed in a classified mode, labels are labeled, and the efficiency is improved. Fault current distribution is accurately calculated, constant value adaptability verification is carried out, constant value optimization is carried out in combination with a multi-objective optimization algorithm and sensitivity analysis, limitation of single-scene constant values is avoided, constant value conflicts under different scenes are reduced, reliability of initial constant values is guaranteed, sensitivity analysis is superposed, it is ensured that the constant values are still reliable during parameter fluctuation, and the reliability of the constant values is improved. The risk of protection operation refusal and misoperation is reduced, a constant value is issued, the device state is monitored in real time, evaluation indexes are calculated, the constant value is controllable in the whole process, and stable operation of the device is guaranteed.

The invention is applicable to the technical field of electrical systems, and provides a new energy access-oriented real-time power grid dynamic constant value checking method, which comprises the following steps of: constructing a full model by acquiring multi-aspect data of a power grid, generating various research state operation modes, and calculating setting parameters by adopting an iterative algorithm considering a new energy short-circuit characteristic, so that the real-time dynamic constant value checking of the power grid is realized. The sensitivity and selectivity of the protection setting value can be accurately checked in real time. Compared with an existing static checking mode, the implementation mode of the invention can adapt to dynamic changes of a power grid operation mode after new energy access, timely discover potential problems of a protection constant value in a new energy environment, generate early warning information and a constant value recommendation interval, effectively avoid failure of the protection constant value, improve reliability and safety of a power grid protection system, and improve the safety of the power grid protection system. Stable operation of the power grid under the condition of new energy high-permeability grid connection is guaranteed, the problem that the prior art cannot adapt to new energy dynamic changes, and consequently a protection constant value may fail is solved, and powerful support is provided for safe operation of the power grid.

The invention discloses an AC-DC power grid intelligent scheduling and protection control method, system and device and a medium, and belongs to the technical field of intelligent power grid operation control, and the method comprises the steps: constructing an AC-DC cooperative scheduling model, dynamically predicting new energy output and load demands, and generating a coordination instruction; establishing a multi-stage linkage protection framework based on a scheduling result, and defining alternating current and direct current system protection collaborative logic; integrating the heterogeneous operation data of the AC / DC system to construct a unified analysis model; a dynamic power flow distribution strategy is optimized in a rolling mode through a deep reinforcement learning algorithm; according to the real-time operation state, dynamically correcting protection parameters and triggering edge side fault quick response; and a closed-loop technical link is formed, and a preorder result drives a subsequent action, so that self-adaptive coordination of scheduling, protection and control is realized. According to the invention, through an AC / DC cooperative scheduling and multi-stage protection architecture, in combination with a deep reinforcement learning algorithm and a dynamic protection mechanism, a "scheduling-protection-control" three-dimensional decision-making system is constructed, and the stability of a power grid is improved.

This invention provides a bimetallic strip circuit disconnection control method and system, relating to the field of circuit protection technology. By acquiring the bimetallic strip deformation signal and calculating the difference, and combining different thresholds and durations for judgment, it distinguishes between instantaneous large fluctuations and continuous small faults, achieving accurate tripping and early warning. It has the advantages of effectively distinguishing between normal instantaneous fluctuations and continuous electrical faults, avoiding false tripping, and providing early warning, thereby improving the accuracy and reliability of circuit protection.

This invention provides an arc light unit, comprising a control circuit, a photoelectric conversion circuit, and a potential adjustment circuit. The key feature is the inclusion of a potential comparison circuit. This potential comparison circuit obtains an adjustable potential threshold from the potential adjustment circuit. It also obtains the arc light signal potential from the photoelectric conversion circuit, with each photoelectric conversion circuit corresponding to a potential adjustment circuit. When the arc light signal potential does not meet a comparison condition, the potential comparison circuit sends a suppression signal to the control circuit. When the arc light signal potential meets the comparison condition, the potential comparison circuit sends an arc light signal to the control circuit. The comparison condition is that the arc light signal potential obtained by the potential comparison circuit from the photoelectric conversion circuit is greater than the adjustable potential threshold. The arc light unit provided by this invention sends an arc light signal to the control circuit by determining whether the arc light signal potential meets the comparison condition. This arc light unit can be used to adjust the photosensitivity.

The invention discloses a chicken flock optimization-based power distribution network distributed power supply adaptive protection coordination method, system and device, and a storage medium, and relates to the technical field of power system relay protection, and the method comprises the steps: collecting power grid operation data in real time through intelligent electronic equipment of each node, and judging whether the system state is changed or not; if the state is changed or a fault trigger signal is received, carrying out power flow and short circuit calculation to obtain a newest fault current; evaluating action coordination of the main relay and the backup relay, and determining whether to start parameter optimization or not according to a result; if starting, constructing a model, solving by using a chicken flock algorithm, and finally issuing optimization parameters to update a relay protection constant value; according to the invention, online adaptive setting of power distribution network protection is realized, the fault isolation precision and the system stability are improved, and the risk of protection maloperation is reduced.

Embodiments provide an Energy Reduction Maintenance Setting (ERMS) key that includes a data connector configured to communicatively couple to a data port of a target device. The ERMS key further includes an illumination device and an actuator mechanism having a base positional state and an actuated positional state. The ERMS key includes logic configured to, upon detecting the actuator mechanism has moved from the base positional state to the actuated positional state, generate and transmit a first data message to the target device through the data connector instructing the target device to enter a protected mode. The logic is further configured to, upon receiving a second data message from the target device over the data connector acknowledging that the target device has successfully entered the protected mode, cause the illumination device to illuminate.

The invention relates to an under-voltage protection circuit suitable for a neutron radiation environment. The circuit comprises NMOS (N-channel Metal Oxide Semiconductor) tubes Q1 and Q2, a voltage-regulator tube D1, diodes D2 and D3 and resistors R1-R5, the anode of the voltage-regulator tube D1 is connected with the anode of the diode D2; the cathode of the diode D2 is connected with the first end of the resistor R1 and the first end of the resistor R2 at the same time. The second end of the resistor R2 is connected with the first end of the resistor R5 and the grid electrode of the NMOS tube Q1 at the same time. The drain electrode of the NMOS tube Q1 is connected with the first end of the resistor R3 and the grid electrode of the NMOS tube Q2; the second end of the resistor R5, the first end of the resistor R4, the cathode of the diode D3 and the drain electrode of the NMOS tube Q2 are connected; the cathode of the diode D1, the second end of the resistor R3 and the second end of the resistor R4 are connected to a power supply VCC; the second end of the resistor R1, the source electrode of the NMOS tube Q1 and the source electrode of the NMOS tube Q2 are connected to a reference ground end GND. The device is realized based on a localized VDMOS, and has the characteristics of neutron displacement radiation resistance, simple design, easy realization, low cost and the like.

The invention discloses an input overvoltage protection circuit and a protection method thereof, and relates to the technical field of overvoltage protection, the input end of an overvoltage detection module is coupled to the output voltage of a power adapter, and the overvoltage detection module is configured to output a trigger signal when the output voltage exceeds a preset threshold; the input end of the switch driving module is coupled to the output end of the overvoltage detection module, and the switch driving module is configured to be switched on in response to a trigger signal; the protection execution module comprises a relay, a coil of the relay is controlled by the output end of the switch driving module, and a normally open contact of the relay is connected to the two output ends of the power adapter in parallel. When the switch driving module is switched on, the coil of the relay is powered on, the normally open contact is driven to be closed, and the output of the power adapter is short-circuited. The technical problem that in the prior art, the input overvoltage point is a fixed value and cannot meet the requirements of various devices is solved, and the technical effects of adapting to the overvoltage protection requirements of various devices and preventing the devices from being damaged due to overvoltage are achieved.

The invention discloses a residual current real-time remote protection method based on edge calculation, which relates to the technical field of power failure protection, and comprises the following steps: executing time sorting and differential calculation based on residual current signal data acquired by current sensors deployed on power distribution branches and corresponding acquisition timestamps; generating a residual current signal record containing the time interval value and the amplitude difference value; extracting a signal arrival delay value and a time jitter value of each record according to the residual current signal record and a locally stored model version number, and fitting the two types of data to generate a time drift compensation parameter; performing version consistency comparison based on the time drift compensation parameter and a cloud model version number returned by the cloud interface; according to the method, a synchronous verification and arbitration updating mechanism of the local and cloud residual current anomaly judgment result is constructed in an edge computing environment, so that the consistency of the judgment result can still be kept under the conditions that the network is unstable and the model is frequently updated.

This application discloses a method, device, and medium for setting the zero-sequence current compensation coefficient in a mixed cable line, belonging to the field of relay protection technology for mixed transmission lines. It includes: obtaining the power frequency impedance and length parameters of an N-segment mixed cable line; and obtaining the comprehensive zero-sequence current compensation coefficient K at each connection point of the N-segment mixed cable line. i 1≤i≤N and i is an integer; obtain the comprehensive zero-sequence compensation coefficient K of the fault point. ’ j 1≤j≤N and j is an integer; obtain the comprehensive zero-sequence current compensation coefficient K0 at the end of the operating range of the grounding distance I protection; determine K ’ j The monotonicity of K0; based on monotonicity, compare K0 with N K's. i The value of the zero-sequence current compensation coefficient K is obtained by considering the magnitude of the zero-sequence current compensation coefficient; N≥2 and N is an integer. This application improves the accuracy of the zero-sequence current compensation coefficient setting, which can ensure the reliability of the grounding distance I-stage protection operation and avoid overshooting and false operation when there is a fault at the end of a mixed line.

The disclosure relates to an arc fault circuit interrupt capable of detecting an arc fault and a method of controlling the device. The arc fault circuit interrupt according to the disclosure is shipped in a factory reset state in which all functions are initialized after a test to check for functional abnormalities, and when receiving an update instruction from an authorized administrator after being installed in the field, receives an update file from a management device such as an energy management system to proceed with a firmware update and activates an arc fault detection function, thereby having the effect of preemptively preventing unauthorized copying of the arc fault circuit interrupt.

The embodiment of the invention provides a low-voltage ride-through protection threshold value setting method and device. The method comprises the steps that the power grid strength and equivalent impedance of an alternating current power grid connected with a grid-connected point in a power system are determined; obtaining grid-connected impedance and equivalent transmission power of an energy system connected to a new energy side in the power system; determining the new energy permeability in the power system; constructing a voltage stability analysis model according to the actual power grid parameters of the power system and a preset interface equation; and processing the power grid strength, the equivalent impedance, the grid-connected impedance, the equivalent transmission power and the new energy permeability by using the voltage stability analysis model to obtain a low voltage ride through protection threshold setting value. The method provided by the invention comprehensively considers the power grid strength and the new energy permeability, and is suitable for most new energy grid-connected scenes.

A device or system for use with an electric power system is provided. The electric power system has a first bus, a second bus, a third bus, a first line between the first and second buses, and a second line between the third bus and one of the first and second buses. The device or system is operative to determine, responsive to at least one trip event, one or several updated impedances of an equivalent model across a line.

The invention relates to the technical field of high-low voltage electrical equipment, and discloses a high-low voltage switchgear assembly with adaptive protection parameters and an online fault diagnosis method. The equipment comprises a parameter acquisition module, a core control module, an execution module and a wireless communication module, wherein a self-adaptive protection parameter adjustment and fault diagnosis unit is arranged in the core control module; the method comprises the steps of parameter preprocessing, feature extraction, hierarchical diagnosis and fault positioning. The protection parameters are dynamically adapted by innovatively adopting a multi-dimensional parameter weighted iterative correction algorithm, and the weight is optimized in combination with parameter self-learning; a whole-process online hierarchical diagnosis system is constructed, and 5G-LoRa dual-mode communication and dual-parameter backup are matched. The method solves the problems of fixed protection parameters of existing equipment, misjudgment and missing judgment of fault diagnosis, unstable communication and the like, improves protection adaptation precision and diagnosis reliability, guarantees continuous power supply, and is suitable for complex power grid scenes such as new energy grid connection.

Apparatuses and methods for implementing contactor opening and fusing strategies in a power distribution unit are disclosed, including a power distribution unit comprising: one or more contactors coupled to one or more charging systems; one or more active fuses in a circuit connecting the one or more contactors to a battery system; and a microcontroller configured to: receive one or more current values; determine whether the one or more current values meet a first set of predetermined current thresholds; in response to determining that the one or more current values meet the first set of predetermined current thresholds, trigger the one or more active fuses; determine whether the one or more current values meet a second set of predetermined current thresholds; and in response to determining that the one or more current values meet the second set of predetermined current thresholds, signal the one or more contactors to open.

A semiconductor device, including: a semiconductor element configured to generate an output current that varies with a change in a temperature of the semiconductor element; a temperature detection circuit that detects the temperature and outputs a temperature detection signal based on the detected temperature; and a correction circuit that causes the output current of the semiconductor element to change based on the temperature detection signal.

Systems / methods for managing a load center (200) uses a thermal model of an overcurrent protection device (204) to adjust the load center (200) energy level. The systems / methods provide an energy management system (212) that manages the amount of load energy (214) in the load center (200) to allow the load center (200) to operate in an overloaded state without inducing thermal tripping of the load center (200). The energy management system (212) determines a thermal shedding time that provides a margin or threshold against the thermal tripping, then determines, for a given load center (200) energy level, whether the load center (200) has been operating in an overloaded state for a time that equals or exceeds the thermal shedding time. The energy management system (212) thereafter determines any load (218) shedding that may be needed to reduce the load (218) energy level. This arrangement allows the load center (200) to remain in an overloaded state without thermal tripping.

A control method for an electronic fuse includes detecting current passing through the electronic fuse regularly at a time interval; storing a plurality of current values detected at a plurality of time points; determining a plurality of trip currents corresponding to a plurality of trip times based on the plurality of current values, including dividing the plurality of trip currents into two portions for determination, where the first portion is obtained by performing a plurality of arithmetic averaging operations on the stored current values, and the second portion is obtained by performing a plurality of arithmetic averaging operations on the current and previously calculated trip currents; comparing the plurality of trip currents with current values corresponding to the plurality of trip times in a trip current versus trip time curve, to generate a plurality of comparison results for controlling a state of the electronic fuse.

For a DC-overcurrent detector (1) comprising an electric line (2), a first current sensor (3), a current flow direction sensor (4) and a comparator unit (5) it is suggested, that the detector (1) further comprises a threshold criterion unit (6), with an input of the threshold criterion unit (6) being connected to the current flow direction sensor (4) for receiving an actual current flow direction, and with an output of the threshold criterion unit (6) being connected to the comparator unit (5), proving the comparator unit (5) with the threshold criterion, and that the threshold criterion unit (6) is adapted to determine a first threshold criterion in case the actual current flows in the first direction (14), and a second threshold criterion in case the actual current flows in the second direction (15).

The invention provides a low-voltage line fault self-adaptive protection method and system based on multi-frequency-point leakage current. The method comprises the following steps of 1, collecting leakage current and calculating judgment current in a specified protection area; step 2, pre-processing the leakage current; step 3, fault starting and preliminary mode judgment based on break variable detection; 4, calculating and judging the proportion Ep0 of the current power frequency signal in the total signal; 5, judging a multi-frequency-point protection mode; the network topology change is monitored in real time, if the topology change occurs, the relation matrix and the threshold value are dynamically updated, and the calculation parameters in the step 3 are synchronously updated; and 7, adaptively setting the threshold: dynamically calculating the threshold based on real-time operation parameters of the system instead of a fixed constant. According to the technical scheme, through multi-frequency-point analysis and a self-adaptive mechanism, the defects can be effectively overcome, and the protection sensitivity and reliability are improved.

A procedure for overcurrent shutdown is proposed, comprising the following steps: - Capturing and providing a current value as an analog output signal; - a conversion of the analog output signal by means of an analog-to-digital converter, which converts the analog output signal by means of sigma-delta modulation and provides it as a bitstream, characterized in that - the bitstream is converted using a first decimation filter and provided as a first data stream; and - Evaluating the first data stream, wherein a threshold value for a current is compared with the current value from the first data stream, and if at least one threshold value is exceeded, the overcurrent shutdown is triggered by means of a shutdown signal, wherein the shutdown signal is transmitted to at least one signal output and is used for opening a power switch. Furthermore, the invention relates to a device.

Disclosed are a batch verification method and system for protection setting values of a distribution automation terminal. The method comprises: presetting a first setting value sheet, and sending a first recall instruction to a first distribution network operation control system according to a preset first batch logic, wherein the first recall instruction is a setting value recall instruction corresponding to the first setting value sheet, and the first setting value sheet comprises in-service setting values; upon the first distribution network operation control system receiving the first recall instruction, returning field terminal setting values corresponding to the first recall instruction; and comparing the first setting value sheet with the field terminal setting values to determine an abnormal state or a non-abnormal state, thereby completing batch verification of the protection setting values of the distribution automation terminal. The present application has the characteristics of intelligence, high efficiency, stability, and precision, can significantly improve the operation efficiency and reliability of a distribution network automation system, and provides a strong guarantee for safe and stable operation of a power system.

A power supply control apparatus for a vehicle controls power supply to a load based on a result of a temperature estimation for an electric wire connected to the load. The power supply control apparatus includes: a change unit configured to change a parameter of the temperature estimation in accordance with the load; and an estimation unit configured to perform the temperature estimation using the changed parameter.

This invention provides a threshold voltage adjustment circuit that allows for easy adjustment of the threshold voltage. [Solution] The threshold voltage adjustment circuit 10 includes a reference current circuit 20 and a transimpedance circuit 30. The reference current circuit 20 outputs a reference current formed on the substrate. The transimpedance circuit 30 has multiple resistors on the substrate and the threshold voltage V is expressed as a function of the combined resistance of the multiple resistors and external resistors and the reference current. TH Outputs.

An Energy Reducing Maintenance Switch (ERMS) connected to an electrical circuit includes: a switch that activates the ERMS upon being closed or turned-on; a normally-open first contact that closes to activate an instantaneous trip setting of a relay upon activation of the ERMS; and a second contact. The instantaneous trip controls an arc flash in the electrical circuit, and the activated instantaneous trip setting of the relay reduces time of the arc flash in the electrical circuit. Upon activation of the ERMS, the second contact closes to initiate ERMS activation alert in two or more forms.

The invention discloses a power plant CT and circuit breaker cooperative dynamic constant value correction method and system, and belongs to the technical field of power system relay protection, and the method comprises the following steps: collecting CT operation parameters, circuit breaker operation state parameters, system operation parameters and environment measurement parameters of a power plant; calculating based on the CT operation parameters and the environment measurement parameters to obtain CT dynamic saturation limiting current, and evaluating based on the circuit breaker operation state parameters and the environment measurement parameters to obtain circuit breaker health state factors; according to the CT dynamic saturation limit current and the system operation parameters, current protection constant value correction is carried out, a corrected quick-break current constant value and a constant time-lag current constant value are obtained, CTI increment is obtained through calculation according to the circuit breaker health state factor, and finally, after dynamic simulation verification is carried out, a protection constant value collaborative correction result is determined and obtained. The method can solve the problem that the protection setting value in the existing power system cannot be dynamically adjusted.

The invention discloses a current transformer adaptive compensation and protection strategy dynamic adjustment method and system, which can accurately identify the saturation state of a current transformer, adaptively calculate a compensation current capable of suppressing the current saturation of the current transformer according to the real-time saturation state of the current transformer, and meanwhile, automatically adjust the protection strategy of the current transformer. A reliable current data source is provided for an external protection device according to the saturation state of the current transformer, and a corresponding protection strategy adjustment instruction sent to the external protection device is dynamically adjusted; therefore, it is ensured that the CT can still keep high measurement precision under the large fault current, the reliability, selectivity and adaptive capacity of an external protection device are comprehensively improved, and the development requirements for safe, flexible and efficient operation of a power grid in the future are met.

A control method (30) for an electronic fuse (26) includes detecting current (Ir) passing through the electronic fuse (26) regularly at a time interval (302); storing a plurality of current values detected at a plurality of time points (304); determining a plurality of trip currents corresponding to a plurality of trip times based on the plurality of current values (306), including dividing the plurality of trip currents into two portions for determination, where the first portion is obtained by performing arithmetic averaging operations on the stored current values, and the second portion is obtained by performing arithmetic averaging operations on the current and previously calculated trip currents; comparing the plurality of trip currents with current values corresponding to the plurality of trip times in a trip current versus trip time curve, to generate a plurality of comparison results (308) for controlling a state of the electronic fuse (310).

The invention relates to the field of distribution box operation state monitoring, and discloses a distribution box operation state monitoring system and method, and the method comprises the steps: collecting temperature, current and environment humidity signals, and constructing a dynamic operation feature matrix; forming an exclusive safety threshold library according to the dynamic operation characteristic matrix of each node in combination with line attenuation characteristics and switch contact aging states; the safety threshold value of each node is used as a constraint state parameter to be introduced into a loop analysis framework, and a multi-layer causal association structure is constructed; based on the multi-layer causal association structure and the historical operation features, constructing an extreme operation condition structure, executing set statistics and entropy feature evolution analysis on corresponding operation states, and generating a risk candidate list; according to the conduction result of the safety threshold constraint in the multi-layer causal association structure and the potential risk candidate list, the nodes on the key causal path are subjected to prospective adjustment of the output power, an operation regulation and control mechanism is formed, and the method has the advantage of improving the early risk identification capability.