24 results about "Reactive load" patented technology

The invention discloses a power semiconductor board-level test system and method, and belongs to the technical field of power semiconductor device test. According to the system, a reactive aging test and a dynamic characteristic test are creatively integrated on a single test platform, and the problems of low efficiency and high cost of a traditional substation test are solved through modular design. The system comprises a multifunctional test head arranged at a test station and capable of being connected with a power terminal and a signal terminal of a power module at the same time; the reactive load loop is formed by a three-phase adjustable reactor; the high-precision signal acquisition module comprises a flexible current probe and a differential voltage probe; the oscilloscope realizes multi-channel synchronous acquisition; and accurate control is realized based on the main control board card of the FPGA. According to the testing method, Vge, Vce, Ic and other parameters are collected in real time in the reactive aging process, online monitoring of dynamic characteristics is achieved through a current triggering mechanism, and a fault recording function is achieved.

The invention relates to the technical field of switch cabinets, in particular to an intelligent low-voltage switch cabinet which comprises a cabinet body. The execution unit comprises a circuit breaker handcart used for disconnecting the current of the load circuit and a plurality of contactors used for switching the load circuit; the detection unit is used for detecting the instantaneous reduction voltage of the load, the current harmonic phase difference of the phase current signal of the main bus, the current harmonic signal proportion and the environment temperature in the cabinet body; the control unit is used for determining a load protection grade according to the instantaneous reduction voltage of the load, and determining the interval duration of starting the circuit breaker handcart and the contactor in the inrush current impact compensation mode according to the load protection grade and the duration of the instantaneous reduction voltage; the asynchronous action starting mode of the contactors is adjusted according to the harmonic wave phase difference, and the access proportion of the reactive load is adjusted according to the harmonic wave signal proportion and the progressive increase node similarity of the environment temperature in the cabinet body in the time sequence. According to the invention, the load stability is improved.

An antenna of a communication device includes a first antenna element operatively coupled to a transmitter of the communication device, the first antenna element configured to radiate a first signal generated by the transmitter; a second antenna element operatively coupled to a receiver of the communication device, the second antenna element configured to receive signals; and at least one third antenna element operatively coupled to at least one first reactive load, the at least one third antenna element configured to radiate a second signal modified in accordance with the at least one first reactive load, the second signal being induced at the at least one third antenna element by the first signal, and the at least one first reactive load being configured to modify the second signal to destructively cancel with a third signal induced at the second antenna element by the first signal.

According to one embodiment, a power amplifier includes a plurality of switches and an output tank network. One or more of the switches are configured to generate one or more first intermediate waveforms having one or more first fundamental frequency components, and one or more of the switches are configured to generate one or more second intermediate waveforms by chopping the one or more first intermediate waveforms with controllable timing. The second intermediate waveforms have one or more second fundamental frequency components that are controllably reduced from those of the one or more first intermediate waveforms. The output tank network is configured to filter the one or more second intermediate waveforms to provide an output waveform to a load, the output waveform having one or more third fundamental frequency components. In some cases, all switches achieve zero voltage switching under different power and load conditions with resistive and reactive loads.

A working machine (100) using a DC power system (700) that isolates reactive loads is described herein. A work machine (100) uses a machine power distribution unit (712) that receives direct current power from two or more battery packs of a power unit, where each of the battery packs delivers power on a separate direct current bus. A machine power distribution unit (712) of the work machine (100) receives power from the battery and is used to isolate power using the bus connector. One of the battery packs supplies power to one DC bus of the work machine (100), and the other battery pack supplies power to the other DC bus of the work machine (100). A reactive load powered by one of the battery packs is electrically disconnected from another reactive load powered by another battery pack.

The invention discloses a power system operation mode generation method and device, terminal equipment and a storage medium, and belongs to the technical field of operation mode generation, and the method comprises the steps: obtaining active power data, a preset network topology model and a reactive load of a first node of a power system in a preset long-scale time period, carrying out direct-current power flow calculation and reactive compensation to obtain operation mode data of a long-scale time period; performing frequency simulation on the operation mode data in the long-scale time period, and generating a power simulation curve; and extracting a minute-level active power value from the power simulation curve, calculating a reactive load of a second node and a second reactive injection amount according to the minute-level active power value, and then generating minute-level power system operation mode data. Through the implementation of the method and the device, the problem that in the prior art, due to the fact that a minute-level short-time-scale operation mode cannot be generated, safety and stability analysis is difficult to carry out on the electric power system more accurately can be solved.

This invention discloses a method, device, electronic equipment, and storage medium for real-time reactive power control in distribution networks based on co-simulation, belonging to the field of smart distribution network operation control. The method includes: acquiring real-time active power values ​​of each photovoltaic inverter in the distribution network, as well as real-time active load values ​​and real-time reactive load values ​​of each load node; generating an initial population containing multiple sets of reactive power control vectors based on the real-time active power values; determining a target reactive power control vector from the initial population through iterative optimization, and controlling each photovoltaic inverter to adjust its power according to the target reactive power control vector. By implementing this invention, the problems of cumbersome modeling and difficulty in adapting to complex distribution network topology changes caused by relying on the construction of explicit mathematical models in existing technologies, and difficulties in convergence or even no solution in optimization under severe source-load fluctuations due to the use of hard voltage constraints, can be solved.

The embodiment of the invention discloses an energy storage equipment installation method and device, electronic equipment and a computer readable medium. A specific embodiment of the method comprises the steps of obtaining node topological data, parameter data of each line, a new energy output matrix, an active load matrix and a reactive load matrix; generating an active net injection power matrix and a reactive net injection power matrix; generating voltage deviation average data, an out-of-limit node number set, a node out-of-limit voltage sensitivity matrix and a power sensitivity matrix; generating a time sequence out-of-limit voltage sensitivity matrix; generating a time sequence power sensitivity matrix; determining an energy storage access point data sequence of the energy storage equipment; and controlling the mechanical arm to mount the at least one energy storage device to the corresponding at least one mounting point. According to the embodiment, waste of installation resources during installation of the energy storage equipment can be reduced.

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.

This invention discloses a distributed AC optimal power flow solution method based on a multi-branch neural network, comprising: establishing an AC optimal power flow model; modeling the power system as a weighted graph based on complex network theory, and using the Louvain algorithm to perform community partitioning on this weighted graph; training a multi-branch DNN model for the entire power system, and using this model to learn the mapping relationship between input features and output features; using the trained DNN model to provide predicted voltages of non-zero injected nodes in the region using input features; calculating the voltages of ZigBs (Zones of Injection) using the Kron simplification method; obtaining predicted active and reactive load values ​​based on the voltages of the ZigBs and the provided load, and obtaining the demand load through the predicted load values. This invention can effectively reduce the network size, improve training efficiency, and enhance the accuracy of the solution. Furthermore, its flexibility and robustness make it more capable of handling future complex power system optimization tasks.

Antenna array system (1) comprising: - a powered main antenna (30) configured to emit a beam directed along a plurality of main directions, said powered main antenna operating in a first frequency band; - an array of parasitic antennas (10.1, 10.2, 10.3, 10.4) arranged to form a first envelope concentrically surrounding the main fed antenna (30), each antenna comprising a substrate of dielectric material (13.1, 13.2, 13.3, 13.4) having one face oriented outwards from the envelope provided with a parasitic radiating element (11.1, 11.2, 11.3, 11.4) and provided with a ground plane, the parasitic radiating element (11.1, 11.2, 11.3, 11.4) being connected to the ground plane via a reactive load (12.1, 12.2, 12.3, 12.4), each parasitic antenna being configured to emit a beam directed along a principal direction, the reactive loads (12.1, 12.2, 12.3, 12.4) being configured to selectively activate electromagnetic coupling between the main fed antenna and a pair of parasitic antennas to modify the directivity of the main fed antenna. Abstract figure: Figure 1.

The invention discloses an inverter switching time test method and device, equipment and a storage medium. The method comprises the following steps: acquiring a target power value, controlling the operation of electrical equipment based on the target power value, and putting a reactive load into work; respectively acquiring a first waveform and a second waveform of an alternating current input end and an alternating current output end of the inverter by utilizing acquisition equipment; after the contactor is disconnected, acquiring a third waveform and a fourth waveform of the alternating current input end and the alternating current output end of the inverter respectively by utilizing acquisition equipment; and obtaining an inverter input waveform based on the first waveform and the third waveform, obtaining an inverter output waveform based on the second waveform and the fourth waveform, and determining the switching time of the inverter according to the inverter input waveform and the inverter output waveform. According to the scheme, the dynamic characteristics of the switching process are precisely restored through dual-channel waveform acquisition, the response capability and the switching performance of the inverter in a power-off scene are effectively evaluated, and the method is suitable for performance testing of scenes such as a distributed optical storage system and household emergency power supply.

1. Name of the product in this design: High-voltage capacitor switching switch. 2. Application of this design: This design is used for the frequent switching on and off of high-voltage active or reactive loads. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

According to one embodiment, the power amplifier includes a plurality of switches and an output tank network. One or more of the plurality of switches are configured to generate one or more first intermediate waveforms having one or more first fundamental frequency components, and one or more of the plurality of switches are configured to generate one or more second intermediate waveforms by chopping one or more of the first intermediate waveforms at a controllable timing. The second intermediate waveforms have one or more second fundamental frequency components that are controllably reduced from the fundamental frequency components of one or more first intermediate waveforms. The output tank network is configured to filter one or more second intermediate waveforms to provide an output waveform having one or more third fundamental frequency components to the load. In some cases, all switches achieve zero-volt switching under different power and load conditions with resistive and reactive loads.

The utility model relates to the technical field of power distribution line ice melting, in particular to an on-load line ice melting structure and a control system based on a reactive compensation principle, which comprises a line load comprising N sections of sub-lines connected in sequence, and N is a natural number greater than or equal to 1; and the compensation module comprises a reactive power supply and a reactive load, the reactive power supply is connected to the front end of each section of sub-circuit, and the reactive load is connected to the tail end of each section of sub-circuit. The beneficial effects of the utility model are that the operation strategy is adjusted in real time according to the operation condition of the line, four control modes including a line protection mode, an ice melting mode, a voltage regulation mode and a standby mode are provided, the voltage stabilization characteristics of the capacitor and the reactance can be fully utilized, and the ice melting function of the line can be realized under the condition that the line is not stopped.

The invention discloses a power-traffic coupling system prevention and control method for toughness improvement. The method comprises the following steps: 1) obtaining network parameters and operation parameters of a power system and a traffic system; 2) acquiring scene data, including active load and reactive load of a power system, travel demands of different starting and ending points in a traffic system, and proportions of electric vehicles; 3) based on the acquired network parameters, the operating parameters and the scene data of the two systems, constructing an operating constraint under a conventional working condition and an operating constraint under a fault working condition; and 4) based on the constructed constraint, taking a price signal and distributed power supply output as regulation and control objects, and taking minimization of the operation cost of the two systems under a conventional working condition as a target function, establishing a power-traffic coupling system prevention and control model oriented to toughness improvement, and solving to obtain a prevention and control strategy for ensuring the operation safety of the power-traffic coupling system after the fault.

The invention relates to the technical field of vehicle gauge level power component detection, and discloses a reactive load vehicle gauge level power component test tool, which comprises a test cabinet, a sliding table and a mounting table, and is characterized in that the sliding table is mounted in the test cabinet through a horizontal sliding pair and can partially extend out of the test cabinet along the length direction of the sliding table, and a support box with a top opening is fixed at the upper end of the sliding table; the mounting table is fixedly embedded in the opening of the supporting box, a pair of mounting shafts is rotationally mounted on the mounting table, and the area between the mounting shafts is a placement station of the vehicle-specification-level power component; at least two clamps are uniformly mounted on the mounting shaft at intervals in the circumferential direction; the at least two clamps on the same clamping component are used for clamping the vehicle gauge-level power components with different sizes; the vehicle gauge-level power components with different sizes can be clamped and positioned, and the practicability is high; when the power is suddenly cut off, the spring can automatically slide the vehicle-gauge-level power component away from the test probe, so that negative effects on the vehicle-gauge-level power component caused by sudden power-on after the power is cut off are avoided.

The application relates to a kind of full-load test method and circuit of high-power H bridge power unit, which comprises: the output end of the H bridge power unit module to be tested is connected to a reactive load; the H bridge power unit module to be tested is driven by a PWM wave, the inverter output current and voltage of the H bridge power unit module to be tested are detected, so that the inverter output current of the H bridge power unit module to be tested is equal to the rated current value, the full-load current operation of the H bridge power unit module to be tested is realized; the inverter AC output voltage is compared with the rated voltage value, if the output voltage value is less than the rated value, the reactive load is reduced, and if the output voltage value is higher than the rated value, the reactive load is increased; when the H bridge power unit module to be tested reaches the voltage and current full-load operation state, it automatically enters the aging timing stage, and when the aging time reaches the set time, it automatically exits the full-load test. The application can perform full-load test on a single H bridge power unit module to be tested, has high test accuracy and low energy consumption.

Embodiments of the present disclosure disclose an energy storage device installation method, device, electronic device and computer readable medium. A specific embodiment of the method comprises: obtaining node topology data, various line parameter data, new energy output matrix, active load matrix and reactive load matrix; generating active net injection power matrix and reactive net injection power matrix; generating voltage deviation average data, out-of-limit node number set, node out-of-limit voltage sensitivity matrix and power sensitivity matrix; generating time-series out-of-limit voltage sensitivity matrix; generating time-series power sensitivity matrix; determining energy storage access point data sequence of the energy storage device; and controlling a mechanical arm to install at least one energy storage device to at least one corresponding installation point. The embodiment can reduce installation resource waste when installing the energy storage device.

There is a battery system configured to manage reactive energy transfer between a plurality of battery cell modules, where a switching circuit is configured to selectively connect any two or more battery cell modules with a reactive circuit, and configure the polarity of each battery cell module connected with the reactive circuit. A controller is configured to control the switching circuit to connect a first group of one or more battery cell modules to drive a reactive current through the reactive circuit. The controller also controls the switching circuit to connect a second group of one or more battery cell modules to the reactive current with a polarity opposite to that of the first cell group. The polarity connection of the second group is based on a determined phase angle of the reactive current.

The present disclosure relates to an antenna arrangement including a first antenna configured to operate within a first frequency band and a second antenna configured to operate within a second frequency band. The first frequency band is higher than the second frequency band. Further, the second antenna is at least partly arranged within an illumination-field of the first antenna. Furthermore, the second antenna includes a dipole structure segmented into a plurality of electrically conductive sections, wherein each electrically conductive section is coupled to an adjacent electrically conductive section by a reactive load section.

A power supply system for providing, powered by an external power source, a load power to one or more loads is provided. The power supply system includes a power supply bus connectable to the external power source, a first electric component, a first feed forward data link, and a first synchronous condenser configured to output reactive power to the power supply bus. The first electric component is arranged in a first electric supply line between the power supply bus and a first load. The first electric component has a first determining unit configured for determining a first operating characteristic having information about fluctuations in the load power, particularly fluctuations in a reactive load. The first synchronous condenser has a first synchronous condenser controller configured for receiving, through the first feed forward data link, a first reference set point, the first reference set point being based on the first operating characteristic, and configured for controlling an operation of the first synchronous condenser based on the first reference set point.

The application relates to the technical field of switch cabinets, in particular to an intelligent low-voltage switch cabinet, which comprises a cabinet body, an execution unit, a detection unit and a control unit; the execution unit comprises a circuit breaker trolley for disconnecting the current of a load circuit and a plurality of contactors for switching the load circuit; the detection unit is used for detecting the instantaneous reduced voltage of the load, the current harmonic phase difference of the phase current signal of a main bus, the current harmonic signal proportion and the environment temperature in the cabinet body; the control unit is used for determining the load protection level according to the instantaneous reduced voltage of the load, determining the interval duration of the start of the circuit breaker trolley and the contactor according to the duration of the instantaneous reduced voltage according to the load protection level, adjusting the asynchronous action start mode of the plurality of contactors according to the harmonic phase difference, and adjusting the access proportion of the reactive load according to the similarity of the increasing nodes in time sequence of the harmonic signal proportion and the environment temperature in the cabinet body. The application realizes the improvement of the load stability.

This invention provides a method for improving the circulating current stability of an off-grid parallel system. The method involves calculating the rotation angle of the converter output voltage using a phase-locked loop (PLL) and applying it to the dq transformation of the voltage-current loop and the average active power P. x and average reactive power Q x The calculation of the virtual inductive reactance and the negative-sequence d- and q-axis voltage drops is performed. When performing the d-q inverse transformation, the off-grid local oscillator angle of the converter is used as the rotation angle to distinguish it from the former, so that the control loop of the converter is no longer affected by the positive-sequence q-axis component of its output voltage, effectively suppressing the positive-sequence q-axis circulating current of the converter. At the same time, a virtual inductive reactance is added to the negative-sequence loop to suppress the negative-sequence circulating current of the converter, realizing the effective suppression of parallel circulating current, improving the circulating current stability of the off-grid parallel system, and eliminating the need for communication between converters, thus not affecting the converter's adaptability to reactive loads.