72results about "Apparent power measurement" patented technology

The invention discloses a method and device for the recognition of power load and electric appliance types and the statistics of electric quantities of different electric appliances. The method comprises the steps: carrying out the sampling of a high-voltage signal and a large-current signal of one side of a power grid, carrying out the analysis of the employed data, recognizing an electric appliance in use in the power grid, monitoring the electric quantity of each type of electric appliance in real time, finding the electric appliance which wastes the electric energy according to the monitoring result, and taking the further measures to achieve the energy saving and emission reduction.

The invention provides a portable ring network cabinet data tour inspection acquisition method based on internet of things information integration. The portable ring network cabinet data tour inspection acquisition method is characterized by comprising the steps of data acquisition, data inquiring and downloading and data analysis. Signals are transmitted to a portable handheld terminal by utilizing a wifi network environment based on an existing data acquisition module and an uploading module of electrical parameter monitoring equipment and an intelligent switch cabinet, a temperature sensing device of a ring network cabinet electrical equipment temperature monitoring device and an acquisition device, a central processor device and a heating / heat-radiating device of an electrical equipment operation environment regulation and control method and system, and then the portable handheld terminal performs setting and control so as to meet the tour inspection requirements of a ring network cabinet and thus the portable ring network cabinet data tour inspection acquisition method based on internet of things information integration has advantages of being scientific and reasonable, high in applicability and excellent in effect.

Aiming at problems that cost of a traditional relay protection device is high, acquisition precision is not high, measurement data is not complete and measured electric energy precision is low, the invention provides a relay protection device based on a 12-bit AD in a SOC chip. A technical scheme is characterized in that a power grid frequency is stored in a CPU module; the CPU module reads a frequency value and makes an acquisition frequency of an AD module which collects data in a period be consistent with a frequency of one period in a power grid; an ADC port in the AD module works under a multi-loop acquisition mode; a pulse counting method is used to accumulate electric energy and time 10ms is taken as a statistics period; an accumulation result is divided into two integers which are stored in an RAM; and one integer stores a pulse value and another integer stores an integer electrical degree. In the invention, a hardware circuit is simplified; under the condition that CT is measured, measured values of active power, reactive power, apparent power, a power factor and four-quadrant electric energy can be provided, and electric energy precision can reach a 0.5S grade.

The invention provides a bidirectional measurement device of electric quantity parameters of a distributed photovoltaic grid-connected system. The bidirectional measurement device comprises a single chip microcomputer, an alternating-current electric energy measurement circuit and a serial communication interface, wherein the single chip microcomputer is connected with the alternating-current electric energy measurement circuit and the serial communication interface respectively; the alternating-current electric energy measurement circuit comprises an electric energy metering chip CS5463, an alternating-current voltage acquisition unit and an alternating-current current acquisition unit; the alternating-current voltage acquisition unit is connected between a power distribution network and a power utilization network; the alternating-current current acquisition unit is connected between the power distribution network and the power utilization network; the electric energy metering chip CS5463 is connected with the alternating-current voltage acquisition unit and the alternating-current current acquisition unit respectively; the single chip microcomputer adopts a chip STC12C5A60S2, and is further connected with output voltage and output current of a photovoltaic module.

A power level identification circuit includes a power interface, a voltage conversion unit, a waveform detection unit, a signal pre-processing unit and a processing unit. The power interface receives electrical power and first signals indicating a level of the power. The voltage conversion unit receives the power from the power interface and converts the power. The waveform detection unit filters the power and obtains the first signals indicating power level. The signal pre-processing unit shapes the waveform of the first signals indicating power level and thereby generates second signals indicating power level. The processing unit identifies a level of the second signals indicating power level and switches to one of modes of the power level identification circuit corresponding to the identified level of the second signals indicating power level. A power level flag circuit and a power level supply system are also provided.

Methods and systems for measuring and / or managing power consumption by power units connected to an electricity distribution network are disclosed. Power flow to and / or from a power unit connected to an electricity distribution network is controlled in accordance with a control sequence, such that the consumption and / or provision of power by the power unit results in a power flow having a predefined flow pattern, and having a characteristic, such as an amplitude, which can be remotely measured. This measurement may be performed using a method in which a signal indicative of power flowing at a measurement node is measured and correlated with a predefined pattern, and a characteristic of the correlated signal is measured. Thus, power flow characteristics resulting from a group of one or more power flow devices can be remotely detected and measured.

Embodiments of an electric power measuring system capable of computing accurate electric power information using a low voltage measuring instrument in a small-scale electric power system are provided. The electric power measuring system may include a first measuring instrument for measuring and detecting a current and a zero-cross point from a distribution line and for generating and outputting current information of the distribution line from the current and the zero-cross point, and a second measuring instrument for computing electric power information of the distribution line according to a voltage thereof and the current information output from the first measuring instrument.

A power vector analyzer to analyze power from a device under test (DUT) includes one or more channels to measure a reference voltage signal from a power line connected to the DUT, one or more channels to measure a reference current signal from the power line, a user interface comprising a display and one or more controls, and a quadrature synchronous detector (QSD) for each phase of apparent power being measured, the QSD configured to use a reference voltage signal from the one or more channels and a reference current signal from the one or more channels to determine the apparent power for each phase of power being measured by the DUT and display the apparent power for each phase on the display.

The invention discloses a method for evaluating a small current variable by apparent power, and belongs to the technical field of electromagnetic measurement. The method comprises the steps of S1, detecting a small current on a line; S2, collecting the current detected in the step S1, and multiplying the current by a given apparent voltage to obtain apparent power; S3, accumulating the apparent power obtained in the step S2 in real time to obtain apparent electric quantity; and S4, reading the apparent electric quantity in the step S3 once at an interval T, calculating the variation of the apparent electric quantity in each time period, comparing the relative variation amplitude of the apparent electric quantity variations in two adjacent time periods, and making a decision of continuing to detect or report according to the relative variation amplitude. According to the judgment method, the change trend of the damage energy in the line is automatically judged according to the change amplitude of the apparent electric quantity in the adjacent same-length time periods, the development situation of the damage energy is mastered, and an early warning signal is given when the increase amplitude is large, so that workers are reminded to take security check measures, safe production is ensured, the waste of raw materials is avoided, and the loss is reduced.

The embodiment of the invention discloses a malignant load identification method. The method comprises the following steps: acquiring power utilization parameters of power utilization equipment at a plurality of moments; determining reactive power at each moment based on the power utilization parameters at each moment; and outputting a malignant load identification signal when the change of the reactive power at the plurality of moments does not meet a first change condition, wherein the malignant load identification signal is used for representing that the electric equipment is a malignant load. The embodiment of the invention also discloses a malignant load identification device, malignant load identification equipment and a storage medium.

The invention discloses a multiphase electric energy meter, a counting method thereof and a computer readable storage medium, and relates to the field of electric energy meters, and the counting method comprises the steps: obtaining a plurality of pulse interruptions transmitted by an external metering unit in a first time period; according to the multiple pulse interruptions, the number of active pulses, the number of reactive pulses and the number of apparent pulses are obtained through calculation; according to a power integral weight obtained by the external metering unit in a first time period, classifying the active pulse number, the reactive pulse number and the apparent pulse number according to phases of a preset phase information set to obtain a pulse distribution result; according to the pulse distribution result, active electric energy, reactive electric energy and apparent electric energy corresponding to the phase information set are obtained through calculation. Various types of electric energy calculation can be carried out internally through the pulse number, frequent access with an external metering unit is not needed, and loss of electric energy counting is reduced.

The invention relates to the technical field of power transformation equipment, in particular to a method for measuring frequency characteristics of an iron core of a dry-type voltage transformer. The signal generator applies voltage with constant amplitude and adjustable frequency to the iron core, current, active power, reactive power, apparent power and power factors under different frequencies are obtained from the power analyzer, and the purpose of measuring the frequency characteristic of the iron core is achieved. The obtained data is calculated and analyzed to obtain the influence of the frequency on the iron core loss and the iron core magnetic conductivity. The method has guiding significance in the aspect of researching the influence of harmonic waves on the measurement precision of the dry-type voltage transformer.

The invention provides a broadband oscillation in-situ monitoring and cooperative defense system, and relates to the technical field of power system control, and the system comprises a new energy substation which is used for obtaining the electrical parameters of a new energy station, calculating the oscillation characteristic quantity of the new energy station according to the electrical parameters, and achieving the evaluation, early warning and control removal functions of broadband oscillation; the regional master station is used for receiving the electrical parameters and the oscillation characteristic quantity sent by the new energy substation and positioning an oscillation source by using a broadband oscillation monitoring traceability technology so as to realize accurate control in turns; and the dispatching master station is used for monitoring the frequency and voltage level of the power system and the generator tripping quantity information of each regional master station in real time, carrying out system safety check by combining the frequency and voltage level of the system, the generator tripping quantity of each master station and the operation condition of the system, and sending a locking instruction to the related regional master station, thereby realizing effective prevention and control of broadband oscillation on the basis of ensuring the safety of a large power grid. According to the invention, accurate positioning and cooperative prevention and control of broadband oscillation of the novel power system are realized.

The invention relates to a non-linear power measurement and analysis recorder. The non-linear power measurement and analysis recorder comprises a signal sampling unit, a signal conditioning unit, a range selection unit, an analog-digital conversion unit, an electric isolation unit and a metering subsystem, wherein the signal sampling unit comprises multiple signal sampling circuits; the signal conditioning unit comprises multiple signal conditioning circuits; the range selection unit comprises multiple range switches; the metering subsystem is used for measurement to obtain a value of a sampled signal, controlling one range switch to be switched on according to the value and detecting whether the value of the sampled signal is in the current measuring range, when the value of the sampled signal is in the current measuring range, switching-on of the current range switch is kept, otherwise, the current range switch is controlled to be switched off, and another range switch is controlledto be switched on. Continuous rapid adjustment for the range is realized, and the recorder can be adaptive to non-linear waveform measurement, so that current or voltage measurement is more accurate.

To analyze power signals of a motor from a new perspective.SOLUTION: A power vector analyzer 130 for analyzing power from a DUT motor 120 comprises: one or more channels for measuring a reference voltage signal from a power line connected to the DUT 120; one or more channels for measuring a reference current signal from the power line; a user interface having a display and one or more operating units; and a quadrature synchronous detector (QSD) 46 for each phase of apparent power to be measured. The QSD 46 is configured to use the reference voltage signal and the reference current signal to determine the apparent power for each phase of the power to be measured by the DUT 120 and display the apparent power for each phase on the display 144.SELECTED DRAWING: Figure 14

The invention provides an intelligent electricity larceny prevention integrated management system and method. The device comprises a data collector arranged at a primary side incoming line of a transformer or on an overhead line or a drop-out switch. The data receiver is used for receiving the data; and a load monitoring system master station, the data collector collects primary side three-phase current data; the three-phase current data is sent to a data receiver through a wireless channel; the data receiver uploads power utilization information to the load monitoring system master station through a bus. The load monitoring system master station is configured to obtain uploaded primary side data, and screen out generated power consumption abnormity by comparing the primary side data of the special transformer with a load curve counted by an electric energy meter arranged at a terminal of a corresponding user so as to realize real-time monitoring of the power consumption state of the user.

The invention discloses an energy storage system and a method for correcting the collected power of an electric meter of the energy storage system. The method for correcting the collected power of the electric meter of the energy storage system comprises the following steps of S1, controlling the i-th phase independent output power of an inverter; s2, the ammeter collects the voltage, current, active power and apparent power of each phase of the power grid, and calculates the absolute value of the power factor of each phase of the power grid according to the active power and apparent power of each phase; s3, determining the CT wiring condition of the ammeter according to the absolute value of the power factor of each phase of the power grid; and S4, correcting to obtain the real apparent power and the real active power of the ith phase of the power grid by combining the voltage and the current of each phase of the power grid and the CT wiring condition of the electricity meter. According to the energy storage system and the ammeter acquisition power correction method thereof, the CT wiring condition is identified through the absolute value of the power factor, and correct power data can be directly recovered.

The present invention discloses a platform for monitoring small current with apparent power and real-time disposal, belonging to the technical field of electromagnetic measurement. Its current sensor is used to detect the current on the line; the current sampling circuit in the apparent power sensor collects the detected current; the arithmetic unit multiplies the collected current by the given apparent voltage to obtain the apparent power, and accumulates the apparent power in real time to obtain the apparent electric quantity; the central processing unit reads the apparent electric quantity at set time intervals, calculates the change amount of the apparent electric quantity in each time period, compares the relative change amplitude of the change amounts of the apparent electric quantity in two adjacent time periods, and makes a decision to continue detection or report to the host; the host gives an alarm after receiving the alarm signal. This platform judges the change trend of the destructive energy in the line according to the change amplitude of the apparent electric quantity in adjacent time periods of the same length. When the growth amplitude of the apparent electric quantity is relatively large, it can give a warning signal to remind the staff to take safety inspection measures.

The application discloses a kind of photovoltaic inverter MPPT efficiency evaluation method, system and storage medium, respectively to measured voltage and measured current are evaluated, then using the result of respective independent evaluation to determine final MPPT efficiency result, compared with the way of traditional direct calculation power then evaluation, effectively reduce the degree of being influenced by output error.And, in the process of processing respectively, by respectively to measured voltage and maximum power point corresponding voltage, to measured current and maximum power point corresponding current are calculated deviation, then using deviation calculation result to carry out tracking efficiency calculation mode, can directly fundamentally guarantee that final calculated result will be less than 100%, i.e., it is in reasonable range, and evaluation result also has real meaning, can effectively reflect the work of photovoltaic inverter.

The invention relates to a traceability circuit, an equivalent apparent power value obtaining method and device and computer equipment. The method comprises the following steps: acquiring a measurement condition of a traceability circuit, operating the traceability circuit according to the measurement condition, acquiring a circuit parameter measurement value of the traceability circuit under the condition that the operation time length of the traceability circuit reaches a preset time length, acquiring a reference equivalent apparent power value according to the circuit parameter measurement value, and determining the traceability circuit according to the reference equivalent apparent power value. And performing uncertainty evaluation on the reference equivalent apparent power value according to the circuit parameter measurement value, and obtaining a target equivalent apparent power value according to an uncertainty evaluation result. By adopting the method, the traceability of the equivalent apparent power quantity value can be realized, so that the measurement accuracy of the equivalent apparent power is improved.

The present invention relates to the technical field of aircraft generators, and provides an adaptive loading control method and system for an aircraft generator load loading system. In an aircraft generator power component extraction test, a hardware system is constructed and software adopts a closed-loop control and segmented calibration method to achieve load adaptive voltage and frequency loading, thereby improving control accuracy and achieving rapid regulation.

The application discloses a low-rated capacity transformer identification method, device, equipment and medium, first, the nameplate capacity value, transformer short-circuit resistance, short-circuit reactance per unit value and historical operation data of the target transformer are acquired. Then, the estimated capacity value of the target transformer is calculated according to the historical operation data, and the voltage regulation rate of the target transformer is calculated according to the transformer short-circuit resistance, short-circuit reactance per unit value and historical operation data. Finally, whether the target transformer has the first low-rated capacity suspicion is judged according to the estimated capacity value and the nameplate capacity value, and whether the target transformer has the second low-rated capacity suspicion is judged according to the voltage regulation rate; if the target transformer has the first low-rated capacity suspicion and the second low-rated capacity suspicion, the target transformer is determined as a low-rated capacity transformer. In summary, the application can realize the automatic screening of the low-rated capacity transformer, and the double suspicion judgment is made by comprehensively considering the nameplate capacity value, the estimated capacity value and the voltage regulation rate, and the occurrence of misjudgment is also effectively reduced.

Embodiments of an electric power measuring system capable of computing accurate electric power information using a low voltage measuring instrument in a small-scale electric power system are provided. The electric power measuring system may include a first measuring instrument for measuring and detecting a current and a zero-cross point from a distribution line and for generating and outputting current information of the distribution line from the current and the zero-cross point, and a second measuring instrument for computing electric power information of the distribution line according to a voltage thereof and the current information output from the first measuring instrument.

The invention discloses a platform for monitoring low current by apparent power and processing in real time, and belongs to the technical field of electromagnetic measurement. The current on a line isdetected by a current sensor; a current sampling circuit in an apparent power sensor collects the detected current; an arithmetic unit multiplies the collected current by a given apparent voltage toobtain apparent power, and accumulates the apparent power in real time to obtain apparent electric quantity; a central processing unit reads the apparent electric quantity according to a set time interval, calculates the variation of the apparent electric quantity in each time period, compares the relative variation amplitude of the apparent electric quantity variations in two adjacent time periods, and makes a decision of continuing to detect or report to a host; and the host gives an alarm after receiving the alarm signal. The platform judges the change trend of damage energy in the line according to the change amplitude of the apparent electric quantity in the adjacent same-length time periods, and can give an early warning signal to remind a worker to take security check measures whenthe increase amplitude of the apparent electric quantity is large.

The monitoring system includes: a management server, and a transmission device which obtains, from the power storage system, first charged power index values indicating charged power of the power storage system and input / output power index values indicating input / output power from the power receiving point to which the power storage system is connected to a system, and transmits the index values to the management server via a network. The management server includes: a calculation part which calculates, based on the first charged power index values and the input / output power index values, second charged power index values indicating power charged by generated power of the power generation system connected to the power receiving point of charged power of the power storage system; and a diagnosis part which diagnoses presence or absence of abnormality of the power generation system based on the second charged power index values calculated by the calculation part.

The invention discloses an intelligent load monitoring system of a safety type electric energy metering box, which comprises a data acquisition layer, a data transmission layer, a data intelligent processing layer and an application layer, and is characterized in that the data acquisition layer is provided with an intelligent electric meter, a high-precision sensor and an electric energy quality analysis layer, and the data transmission layer comprises a protocol conversion module, an edge conversion module and a communication module; the intelligent data processing layer comprises data access, data processing, data storage, load analysis and intelligent processing, the application layer comprises real-time monitoring, alarm, management, energy efficiency analysis and report, and the electric energy metering box carries out real-time data monitoring on all components in the metering box, collects detailed energy consumption data in each time period, and carries out real-time monitoring on all the components in the metering box. And the collected real-time data is uploaded to the terminal, and is calculated, classified and counted into a table, so that the real-time load condition of each component in the electric energy metering box can be known in time, and the service life of the electric energy metering box is greatly prolonged under the condition that the long-time safe use of the electric energy metering box is ensured.

The embodiment of the invention provides a subsynchronous oscillation monitoring method and device. The subsynchronous oscillation monitoring method comprises the following steps: determining a subsynchronous component signal from a detected electric signal; calculating a subsynchronous comprehensive effective value according to the determined subsynchronous component signal; and judging whether subsynchronous oscillation occurs or not according to the calculated subsynchronous comprehensive effective value. According to the embodiment of the invention, whether subsynchronous oscillation occurs or not can be accurately monitored, so that subsequent targeted treatment is facilitated, and the safety operation and service life of a power grid and a generator set are prevented from being harmed.

The invention provides a method and device for improving the calibration precision of an electricity meter, and belongs to the technical field of electricity meter calibration. The method for improving the calibration precision of the electric meter comprises the following steps: S1, collecting a first real-time voltage and a first real-time current; s2, obtaining a first filtering voltage and a first filtering current; s3, obtaining a correction gain coefficient of the filter; s4, acquiring a voltage calibration coefficient and a current calibration coefficient; s5, collecting a second real-time voltage and a second real-time current; s6, obtaining a second filtering voltage and a second filtering current; s7, calculating and obtaining a voltage and current phase difference calculation value based on the second filtering voltage and the second filtering current; and S8, obtaining a power factor standard value, and calculating and obtaining a phase calibration coefficient based on the power factor standard value and the voltage and current phase difference. The method is simple in calibration process, short in period, high in precision and high in success rate, and production efficiency is greatly improved while product performance indexes are guaranteed.

The invention discloses a device for evaluating a small current variable by apparent power, and belongs to the technical field of electromagnetic measurement. The device comprises a current sensor, and is characterized in that the current sensor is used for detecting the current on a line; a current sampling circuit in an apparent power sensor collects the detected current; an arithmetic unit multiplies the collected current by a given apparent voltage to obtain apparent power, and accumulates the apparent power in real time to obtain apparent electric quantity; and a central processing unit reads the apparent electric quantity according to a set time interval, calculates the variation of the apparent electric quantity in each time period, compares the relative variation amplitude of the apparent electric quantity variations in two adjacent time periods, and makes a decision of continuing to detect or report the information. The judgment device judges the change trend of damage energyin the line according to the change amplitude of the apparent electric quantity in the adjacent same-length time periods, and can upload a signal when the increase amplitude of the apparent electric quantity is relatively large so as to remind a worker to take security check measures.

The invention relates to the field of transformer loss monitoring, in particular to a transformer loss monitoring system based on the Internet of Things, which comprises a transformation data acquisition module, a load analysis module, a loss analysis module, an early warning processing module and a remote monitoring module, the load analysis module evaluates transformer load loss from apparent power, abnormal power duration, iron core loss difference and load difference, calculates a load abnormal comprehensive coefficient and compares the load abnormal comprehensive coefficient with a threshold value to judge whether the load is abnormal, and the early warning processing module carries out early warning according to different set loss levels and corresponding threshold values. According to the method, the defects of a traditional monitoring mode can be effectively overcome, the transformer loss monitoring efficiency and precision are improved, and operation of a power system is guaranteed.