17results about How to "Frequency stability" patented technology

A kind of power device parallel type power module and capacitor charging and discharging method, power module includes two or more than pressure type power device, the two or more than pressure type power device adopts the physical form of half bridge group string upper and lower parallel;The half bridge group string of the pressure type power device is connected in parallel by silicon pile composite busbar;Each power module is provided with pneumatic short-circuit switch, in the case of multiple power module series connection, the pneumatic short-circuit switch is connected in series with all DC capacitors, and charging and discharging is carried out through the ground loop of flexible AC transmission equipment AC, DC valve side;The pneumatic short-circuit switch is connected with gas driving pipeline, and the gas driving pipeline is connected with valve-based gas pressurizing device.The power module can effectively improve the capacity of flexible AC transmission equipment, so that it has short-time frequency modulation capacity output, provides technical scheme support for new power system construction, and guarantees system safety and stability;The provided capacitor charging and discharging method can improve maintenance efficiency and enhance product reliability.

The application provides a multifunctional static synchronous compensator system, comprising: a plurality of three-phase converter valves, input ends of each three-phase converter valve being connected to a common DC bus; an energy storage valve, being connected in parallel with the three-phase converter valve, and the plurality of three-phase converter valves sharing the energy storage valve through the common DC bus; a switch breaker device, being arranged between the three-phase converter valve and the energy storage valve; and a control unit, being connected with the plurality of three-phase converter valves, the energy storage valve and the switch breaker device respectively. The application also provides a method for operating the multifunctional static synchronous compensator system. The multifunctional static synchronous compensator system provided by the application adopts back-to-back converter valves, shares energy storage elements through a common DC bus, and connects two AC buses to the two sides of the converter valve, so that the system can support the two AC power grids, greatly save the installation capacity of the energy storage elements in the energy storage valve, and provide power interconnection between the two AC power grids and play a role in tidal flow control.

The invention discloses a control method and system for a variable frequency air conditioner with a humidity sensor, and the method comprises the following steps: S1, temperature and humidity data collection: collecting environment humidity data in real time at the frequency of 1-5Hz through the humidity sensor arranged on an indoor air return side, synchronously collecting indoor environment temperature data, and sending the indoor environment temperature data to a server; filtering, denoising and abnormal value removing processing are carried out on the collected temperature and humidity data, and the processed temperature and humidity data are transmitted to a control center. The humidity sensor collects data in real time and is combined with the temperature and humidity adaptive model, so that temperature and humidity collaborative precise adjustment is achieved, the comfort degree problems of high humidity, stuffiness, low humidity, dryness and the like caused by only temperature control of a traditional air conditioner are solved, dependence on an independent dehumidification module is not needed, operation energy consumption is effectively reduced, and the humidity adjustment response speed is effectively increased; meanwhile, fixed parameter control limitation is broken through, and the operation efficiency of the variable-frequency driving system is effectively improved.

The present application relates to a resonator and a manufacturing method thereof. The resonator comprises an interdigital transducer. The interdigital transducer comprises a bus bar unit and an interdigital electrode unit. The bus bar unit comprises two bus bars opposite in a first direction. The interdigital electrode unit is located between the two adjacent bus bars. In the first direction, the area between the two bus bars is configured as a plurality of acoustic channels based on the interdigital electrode unit. The part of the interdigital electrode unit located in each acoustic channel constitutes an interdigital electrode group. Wherein, the structure of any two adjacent interdigital electrode groups is different. And the resonant frequency of the main mode in the plurality of acoustic channels is the same. The working performance of the resonator is stable, and the excitation position and strength of the spurious wave generated in the working process of the resonator are dispersed, so that the out-of-band suppression performance of the resonator is effectively improved. And the structure of the interdigital electrode in the resonator and the structure of the interdigital electrode group can be flexibly adjusted based on actual needs. The manufacturing method is simple and easy to implement.

The application provides a rotor slot wedge structure of a magnetically conductive and electrically conductive alloy material, and belongs to the technical field of double-shaft excited electric machines. The magnetically conductive and electrically conductive alloy is adopted, so that the rotor slot wedge structure has both electrical conductivity and magnetic conductivity, can guarantee the damping and oscillation suppression capability of the double-shaft excited electric machine, and can also run asynchronously at a large slip. The inertia support capability of the double-shaft excited electric machine is improved, and the frequency stability of the power system is guaranteed. Compared with a traditional slot wedge structure, a cross-shaped shallow groove is arranged on the surface of the slot wedge, so that the eddy current path can be blocked and the eddy current loss of the slot wedge can be reduced when the double-shaft excited electric machine runs asynchronously at a high slip. In addition, the shallow groove also increases the contact area between the surface of the slot wedge and the air in the air gap, and improves the heat dissipation capability. The double-ventilation groove setting of the air outlet of the slot wedge and the unequal outlet diameter setting are beneficial to balancing the air flow in each radial ventilation groove, reducing the axial thermal imbalance of the rotor winding, and reducing the insulation thermal stress.

The application discloses a high-power magnetron cathode working temperature detection and real-time control device, and relates to the technical field of magnetron temperature detection.The technical points of the application include a composite detection module, an intelligent control module, an execution adjustment module, an anti-interference module and an environment adaptation module.The composite detection module is used for collecting magnetron cathode working temperature signals and pre-processing.The intelligent control module is used for receiving temperature signals and outputting control instructions.The execution adjustment module is used for adjusting the cathode temperature according to the control instructions.The anti-interference module is used for inhibiting electromagnetic interference.The environment adaptation module is used for collecting working condition parameters and feeding back to the intelligent control module.The technical effect is that the application solves the problems of large detection error and unstable signals of the existing device in a high-power high-frequency environment, ensures the accuracy and reliability of temperature detection, realizes real-time and accurate control of the cathode temperature, and ensures the stability of the magnetron output power and frequency.

This invention relates to the field of control technology for hybrid compressed air and flywheel energy storage, and particularly to a method and system for coordinated power control of impulsive loads in an islanded microgrid. The method includes the following steps: real-time monitoring of the microgrid bus power and calculation of the bus power change rate; when the bus power change rate is greater than a first preset threshold, controlling the output power of the flywheel energy storage system to smooth power fluctuations caused by impulsive loads; when the bus power change rate is less than a second preset threshold, implementing a coordinated control strategy for the compressed air energy storage system and the flywheel energy storage system; when the bus power change rate is less than the first preset threshold but greater than the second preset threshold, controlling the compressed air energy storage system to handle normal load fluctuations, and controlling the flywheel energy storage system to operate continuously. This invention achieves smooth power switching through the balanced adjustment of the compressed air energy storage system and the flywheel energy storage system, effectively maintaining the stability of the microgrid bus voltage and frequency.

The invention discloses a photovoltaic energy storage system switching control method based on islanding effect pre-judgment, which comprises the following steps of: 1, acquiring various parameters of a power grid in real time, establishing a power grid state database, and continuously monitoring various electrical parameters of the power grid by adopting a sensor; step 2, a machine learning algorithm is utilized, data in the power grid state database is taken as a training sample, an islanding effect pre-judgment model is constructed, and the islanding effect pre-judgment model is used for predicting the probability of power failure caused by faults of the power grid in a period of time in the future; 3, setting a pre-judgment probability threshold value, and when the prediction probability of the island effect pre-judgment model exceeds the threshold value, sending a grid-connected and off-grid switching signal; and step 4, after the switching signal is received, calculating the required energy storage output adjustment amount according to the current load demand and the output power of the photovoltaic cell. The charging and discharging states of the energy storage system are adjusted by controlling the energy storage converter, so that the sum of the photovoltaic power and the energy storage output can be matched with the load requirement.

The application provides a composite slot wedge structure for inhibiting rotor eddy current of a two-axis excitation phase modifier and a two-axis excitation motor, and belongs to the technical field of two-axis excitation motors. Compared with a traditional slot wedge structure, the two-axis excitation motor adopts a double-layer composite slot wedge structure of a hard bakelite slot wedge and an aluminum bronze slot wedge, so that the two-axis excitation motor has the damping capacity and the ability of reducing eddy current at the same time, can guarantee the damping and oscillation inhibition capacity of the two-axis excitation motor, and can also run asynchronously with a large slip. The inertia support capacity of the two-axis excitation motor is improved, and the frequency stability of a power system is guaranteed. A multi-branch path ventilation groove is alternately connected by single branches and double branches, the winding heat dissipation area is significantly increased, and the turn conductor heat dissipation coefficient is improved. The stepped auxiliary slot ventilation groove and the unequal outlet diameters of the hard bakelite slot wedge are beneficial to improving the air flow distribution uniformity in each radial ventilation groove and reducing the rotor winding axial thermal imbalance.

The invention discloses a bidirectional AC-DC and single-phase-three-phase converter and a control method thereof, and belongs to the field of power electronics, and the converter can be connected with various types of electrical equipment to realize conversion and bidirectional flow of electric energy between DC equipment and AC equipment and between a single-phase AC system and a three-phase AC system. Comprising a single-phase full-bridge module, a three-phase full-bridge module, a direct-current capacitor, switches B1 and B2, n direct-current chopping modules and n switches S1, S2,..., Sn. According to the invention, single-phase alternating current can be converted into three-phase alternating current to be output; bidirectional flow of energy can be realized, direct current can be inverted into alternating current, the alternating current can be rectified into direct current, and single-phase alternating current can be converted into three-phase alternating current; the system has multiple working modes, i.e., a direct current side is connected to a direct current load, energy storage equipment or a direct current power supply, and an alternating current side is connected to a single-phase, three-phase load or a power grid; the device has the capability of feeding power to a power grid, and can provide electric energy of an energy storage system, a direct-current power supply and an electric automobile to the power grid for use.

The application discloses a frequency stability quantitative discrimination method and system suitable for different scenes and belongs to the technical field of power systems. The method comprises the following steps: obtaining model parameters of a target frequency response physical model of a target power system; identifying the model parameters based on a discrimination model to obtain a frequency response curve of the target frequency response physical model for the target power system; and quantifying the frequency stability of the target power system by discriminating the frequency response curve. The application can identify the model parameters of the frequency response physical model to quickly discriminate the discrimination frequency response curve of the power system, thereby quantifying the frequency stability of the power system.

The invention belongs to the technical field of fuel cell testing, and particularly relates to an off-grid fuel cell testing device, a control method thereof and a medium. The method comprises the following steps: after a testing device reaches a stable state, when transient characteristic testing of the fuel cell is carried out, a DC / AC converter of the testing device adopts voltage closed-loop control; when a fuel cell long-term steady state test or a working condition change test is carried out, the DC / AC converter adopts open-loop control; in the voltage closed-loop control, the deviation between the actual voltage of a direct current bus at the direct current side of the DC / AC converter and the reference voltage of the direct current bus is input into a voltage closed-loop controller, and a d-axis voltage reference value used for generating a modulation wave is obtained; and in the open-loop control, obtaining the d-axis voltage reference value according to a modulation degree and a modulation coefficient. The technical problem that in the prior art, a single converter control strategy cannot meet the fuel cell test requirement is solved.

This utility model discloses a dispensing machine needle cleaning device, including an installation platform. A first and second cleanroom cloth rotating shaft groove are installed above the installation platform, with their axes both vertically aligned. A first shaft cylinder is also installed on the installation platform, with its axis parallel to the first cleanroom cloth rotating shaft groove. A first and second cylinder are installed below the installation platform, with the extension rod of the first cylinder facing the second cylinder and the extension rod of the second cylinder facing the first cylinder. A first sponge block is installed on the extension rod of the first cylinder, and a second sponge block is installed on the extension rod of the second cylinder. The first and second sponge blocks are located above the installation platform. This utility model effectively solves the problems of forgotten or incomplete cleaning of traditional needle cleaning methods, achieving higher automatic cleaning cleanliness, more stable frequency, and higher yield.

The application provides a silicon photon gyroscope stable control method and silicon photon gyroscope under a rapid temperature changing condition, and the stable control method comprises the following steps: setting a light source frequency control digital interval; controlling the light source temperature to make the light source center frequency enter a resonance valley, and recording the valley entering temperature; collecting the CW and CCW resonance signals output after the light source enters the resonance cavity, and calculating the sum of the clockwise and counterclockwise resonance frequency and the light source center frequency deviation; and calculating the feedback control light source current and temperature according to the light source frequency control digital interval where the sum of the frequency deviation is located. Through the adaptive control of the light source current and temperature, the light source center frequency can quickly track the resonance frequency of the resonance cavity under the rapid temperature changing condition, the stable control of the gyroscope is realized, and the gyroscope output accuracy is improved.

The application discloses a new energy electrolytic hydrogen production rectifier with off-grid adaptability and a control method, and the rectifier comprises an inverter with droop control, a transformer, a non-controlled rectifier, a DC / DC converter and a controller, can adapt to new energy fluctuation power supply environment, and supports off-grid operation.The control method comprises the following steps: S1, rectifying alternating current and inputting to the DC / DC converter; S2, collecting a real-time frequency value and calculating a frequency deviation value; S3, generating a direct current instruction value; S4, collecting an actual output current value; S5, generating a PWM control signal and adjusting the output current; and S6, realizing speed regulation of the output power of the non-controlled rectifier.The application can achieve the function of assisting in stabilizing the frequency of an off-grid micro-grid, can adapt to the working condition of off-grid new energy electrolytic hydrogen production in the scene of off-grid new energy electrolytic hydrogen production, and enables the hydrogen production load end to follow the high fluctuation of new energy power generation, and simultaneously assists in stabilizing the frequency of the off-grid system.

The invention provides a synchronous operation control method for a wind turbine group rectified and sent out through a diode. The method comprises the following steps: executing machine-side converter control and grid-side converter control on a wind turbine generator; in machine side converter control, decoupling control is carried out on active power and reactive power of a permanent magnet generator, so that the generator works in a maximum wind energy capture interval or a constant rotating speed control interval; in the control of the grid-side converter, a reactive power-frequency virtual rotor equation is constructed, the active power-frequency power angle characteristic of a synchronous generator is simulated, and synchronous operation of a plurality of wind turbine sets is carried out. The core pain point that a diode rectification sending-out system cannot provide stable phase reference is solved, auxiliary network construction equipment does not need to be additionally arranged or an existing network following type wind turbine generator does not need to be greatly improved, the system construction cost and the implementation difficulty are reduced, and the stability, the disturbance rejection capacity and the adaptability under the fault working condition of multi-machine parallel operation are improved.

The application discloses a network-constructing converter control method, system, device and medium, and belongs to the technical field of converter control. The method is as follows: determining a reference current according to real-time inductance current and real-time capacitance voltage of a linear virtual oscillator, and active power reference value and reactive power reference value of a target converter; obtaining real-time alternating current of the target converter to determine a given current; obtaining instantaneous inductance current and instantaneous capacitance voltage of the linear virtual oscillator according to the given current to determine a frequency locking direction; obtaining a target capacitance value according to the frequency locking direction and total current of the linear virtual oscillator to obtain adjusted inductance current and adjusted capacitance voltage of the linear virtual oscillator; and obtaining a voltage modulation reference value of the target converter to control the target converter. Therefore, the application can solve the technical problems of complex and unstable network-constructing converter control in the prior art, and realizes efficient control of the converter.