13 results about "Reactive energy" patented technology

The invention relates to the technical field of smart power grids, in particular to a detection signal design method and device for multi-injection-point and multi-load-node identification, and the method comprises the steps: calculating the static sensitivity of a plurality of to-be-identified load nodes corresponding to each target equipment injection node in a plurality of target equipment injection nodes based on steady-state operation data, establishing a detection signal optimization model taking a reactive detection signal as a decision variable by taking the total minimum load model parameter identification error of a plurality of to-be-identified load nodes as a target and combining static sensitivity, and introducing reactive energy constraints and signal structure constraints of a plurality of target equipment injection nodes and solving; generating an optimal reactive power detection signal waveform of each target equipment injection node, performing evaluation by using a target evaluation index, when an evaluation result meets a preset constraint condition, injecting the optimal reactive power detection signal waveform into the system, and after a response is generated, performing identification on a load model parameter by using the response, and obtaining an identification result of each load node to be identified.

The invention discloses an electric energy metering method and device based on harmonic self-adaptive observation and zero point tracking type SOGI-FLL. The electric energy metering method comprises the following steps: step 1, carrying out ADC sampling on voltage and current signals of a power grid; 2, performing frequency rapid estimation on the voltage signal based on a zero point tracking frequency-locked loop, and obtaining a fundamental wave angular frequency of a power grid in real time; step 3, constructing adaptive observers of voltage and current by using the fundamental wave angular frequency, and estimating parameters of fundamental waves, harmonic waves and direct current components in voltage and current signals in real time through an adaptive law based on Lyapunov stability; 4, according to the parameter estimation value, the amplitude and phase of the voltage and current are calculated; and step 5, calculating active power and reactive power of each harmonic based on the voltage and current amplitudes and phases obtained in the step 4, and summing to obtain total active power and total reactive power so as to realize metering of active electric energy and reactive electric energy. According to the invention, rapid and accurate metering of fundamental wave and harmonic wave electric energy under complex working conditions is realized.

The invention provides an intelligent network connection reactive power energy management system, which belongs to the technical field of power system energy conservation and comprises an original low-voltage power supply system in a power grid, and I-type reactive power difference compensation equipment, II-type reactive power difference compensation equipment and III-type reactive power difference compensation equipment which are connected with the original low-voltage power supply system, the difference compensation results of the three reactive difference compensation devices are transmitted to the intelligent network connection technology platform through the remote transmission terminal; the I-type reactive compensation equipment is used for low-load compensation in a system transformer and reactive compensation of excitation and copper loss of the transformer; the II-type reactive compensation equipment is used for high-load reactive compensation in the system transformer; and the III-type reactive power difference compensation equipment is connected with the single electric equipment of which the load reactive power is greater than a specific value, and is used for reactive power in-situ difference compensation of the single electric equipment. Layered precise energy compensation is realized from the transformer to the terminal equipment, extensibility of macroscopic compensation is avoided, and compensation precision is greatly improved. Compared with the traditional problem that missing compensation is not easy to perceive, equipment abnormity and a compensation gap can be found in time, a fault point can be rapidly positioned, the pain point that maintenance is difficult to carry out in time is solved, and compensation continuity and stability are guaranteed.

This application provides a monitoring system based on an intelligent drop-out fuse, including an insulating support, a fuse tube, a fuse wire, an upper contact mechanism, and a lower contact mechanism. The insulating support includes a skirt section and insulating ends located on the upper and lower sides of the skirt section. A secondary cavity is provided inside the upper insulating end. The skirt section includes two main skirts connected vertically, and a main cavity is located at the connection point of the two main skirts. A voltage and current sensor is installed in the secondary cavity. A metering chip and a wireless communication module are installed in the main cavity. Several communication ports are provided on the outside of the main cavity. The metering chip is electrically connected to the voltage and current sensor, the wireless communication module, and the communication ports. This application can collect voltage and current signals, calculate and output operating parameters through the metering chip, measure the active and reactive energy of each phase, and then transmit the data to a remote location via the wireless communication module. Through real-time monitoring, it can respond to faults more quickly, reduce the damage to equipment caused by faults, and reduce on-site maintenance work.

The invention relates to an electric energy meter which comprises an electric energy meter body and a reactive electric energy meter body state judgment system. The composition curve of the pattern occupied in the last-stage enhanced image obtained after targeted optimization processing of the reactive electric energy meter can be analyzed, the composition curve of the reference pattern corresponding to the reactive electric energy meter is obtained, and then whether the current shape of the reactive electric energy meter reaches the standard or not is judged; therefore, targeted visual identification of the distortion state of the reactive electric energy meter body is completed.

The invention discloses an electric energy measurement method, a controller and a standard electric energy meter, and relates to the field of electric energy measurement. The method comprises the steps of determining a storage depth of a storage space according to a product relationship between a half-wave period data point number and a depth threshold value; based on the storage depth, the multiple half-wave period data are read from the storage space in a sliding and circulating mode, and according to the mean value of the multiple half-wave period data read in a sliding mode, the current and / or voltage effective value is determined; performing active calculation, reading the voltage data and the current data from the same address of the storage space, and determining active power; while reading the current data, reading voltage data after offset based on the preset address offset, and determining reactive power; and determining apparent power and a power factor according to the current effective value and the voltage effective value, and determining active electric energy and reactive electric energy according to the active power and the reactive power. The technical problems of high complexity and high cost of an electric energy metering system in the prior art are solved.

The utility model relates to an electric energy self-circulation system and device for a semiconductor device test, the test system comprises a first filter circuit, a first conversion circuit, a transformation circuit, a second conversion circuit and a second filter circuit, the input alternating current of an external power supply is subjected to primary filtering, rectification, transformation, inversion and secondary filtering, and finally returns to the external power supply. The input electric energy of the system is equal to the output electric energy, a reactive electric energy self-circulation system is formed, a circuit of the test system comprises a to-be-tested component, and the device further comprises a control circuit so as to simulate the operating environment of the actual working condition of the component and test the to-be-tested component. The test system of the utility model is an electric energy self-circulation system, and does not have other extra power consumption except for the loss generated by components, thereby effectively saving the energy consumption; the testing device of the utility model can simulate the actual operation condition of the component to be tested, test the qualified condition of the component, and effectively solve the technical problem of clamping in the semiconductor testing field.

A control device of the present invention is a control device that controls a distributed power source connected to a power system, and includes a range setting section that sets an allowable range of reactive power and active power to be output at normal times, an output control section that controls the reactive power and active power supplied from the distributed power source to the power system within the allowable range set by the range setting section, and a receiving section that receives an excess output instruction from an instruction device in the power system, the excess output instruction indicating that reactive power exceeding the allowable range is to be output, and the output control section outputs the reactive power outside the allowable range when the receiving section receives the excess output instruction.

A battery system configured to manage reactive energy transfer between battery cells, which includes a switching circuit configured to selectively connect any one or more the battery cell modules with the reactive circuit and configure the relative polarity of each battery cell module connected with the reactive circuit. A controller is configured to operate the switching circuit in a first mode and a second mode, where in the first mode, the controller is configured to connect one or more of the battery cell modules through the reactive circuit to an output for an external load, and in the second mode, the controller is configured to disconnect the battery cell modules from the output and drive a reactive current in the reactive circuit by alternately connecting selected one or more battery cell modules with the reactive circuit in a polarity that influences the reactive alternating cunent phase.

An example welding-type power supply includes: a transformer having a primary winding and first and second secondary windings; a first switching element coupled between the first secondary winding and a first output terminal; a second switching element coupled between the second secondary winding and the first output terminal; a third switching element coupled between the first secondary winding and a second output terminal; a fourth switching element coupled between the second secondary winding and the second output terminal; and a control circuit configured to: control the switching elements to selectively output a positive or negative output voltage without a separate rectifier stage by selectively controlling ones of the switching elements based on a commanded output voltage polarity and an input voltage polarity to the transformer; and controlling the switching elements to reverse the power flow to return reactive energy to an input circuit via the transformer.

The invention discloses a control method for thin-gauge energy-saving rolling of a steckel rolling line, and belongs to the technical field of metallurgical automation control. The method comprises the steps that an L1 system receives a roll gap set value and a speed set value of a finishing mill issued by an L2 system; when the roll gap set value is not smaller than the preset threshold value, the set value issued by the L2 system is executed; when the roll gap set value is smaller than the preset threshold value, the L1 system lifts the roll gap of the finishing mill and maintains the running of the finishing mill at the preset threshold value; the main transmission speed of the finishing mill is controlled to be smaller than the speed set value; when the steckel mill carries out rolling of the last Nth pass and is about to bite strip steel, the L1 system adjusts a roll gap of the finishing mill to a roll gap set value; and the speed of the finishing mill is increased to a speed set value. According to the method, by optimizing the roll gap and speed control in the no-load period, reactive power consumption is remarkably reduced, normal rolling is not affected, the energy-saving effect is remarkable, and implementation is easy.

The application relates to the technical field of electric energy metering and communication, and particularly discloses an intelligent mutual inductor supporting electric energy metering and communication. The application integrates a through-type current mutual inductor, voltage terminals, a metering module, a main processor, a communication interface and a communication module, so that three-phase current lines complete current and voltage signal collection in a disconnected-free state, generate electric energy metering data containing active electric energy and reactive electric energy through analog-digital conversion and digital signal processing, and realize Bluetooth mesh local networking and wireless remote communication with a master station through the communication module, thereby solving the problems of complicated installation of a traditional electric energy meter, increased line impedance and transmission loss caused by cutting off the current line, single communication mode, inability to directly connect to the master station, lack of multi-mode communication and high-precision metering support, improving electric energy metering precision and installation convenience, and enhancing the flexibility of power grid communication and the intelligent management level.