11 results about "Resonance problem" patented technology

The present application relates to the technical field of resonance suppression, and particularly relates to a resonance suppression method, system and equipment for distributed energy storage network construction control. By acquiring stable integral gain and stable differential gain, it can ensure that the PID controller is more agile in the control process, optimize the dynamic performance of the system, and appropriate stable integral gain helps to eliminate steady-state error. By acquiring the response characteristic curve in real time, it helps to dynamically adjust the gain, quickly respond to changes, and reduce the risk of resonance. The amplitude-frequency characteristic curve and the phase-frequency characteristic curve provide an intuitive evaluation of the stability and response speed of the energy storage system, thereby effectively improving the performance of the PID control and reducing the risk of resonance. By judging the stability margin, the stability of the energy storage system can be evaluated in real time, potential problems can be found in time, and resonance can be avoided. According to the judgment result of the stability margin, a lag compensator or a phase compensator is selected for adjustment to solve the resonance problem in the energy storage system.

The present application relates to a kind of distribution network user side loop resonance active suppression method and system, by real-time monitoring and calculating harmonic distortion rate and key frequency point amplitude, whether the system is in resonance state is intelligently judged.When potential resonance risk is detected, actively start resonance suppression device work, actively destroy resonance occurrence condition, the resonance suppression device has two control modes: damping enhancement mode is by input resistor to improve system damping, effectively suppress resonance energy accumulation;Damping enhancement and frequency offset collaborative mode, in combination with damping enhancement mode, then by adjusting capacitor switching capacity, change system inherent resonance frequency, make it deviate from current harmonic frequency, to avoid resonance, the control algorithm of resonance active suppression device is realized by PID algorithm.The present application is suitable for the low-frequency harmonic resonance problem caused by nonlinear load in user side low-voltage distribution network, and is suitable for the comprehensive treatment of resonance problem in industrial, commercial and civil power system.

The invention relates to a fan system resonance detection method and an intelligent electric appliance. The fan system resonance detection method comprises the steps that a plurality of sensors are arranged on a fan system; constructing a simulation model of the fan system, importing the vibration signals collected by each A-type sensor into the simulation model, and obtaining vibration data of the whole fan system by using a modal extension method; establishing a digital twinborn model, and importing the simulation model, vibration data of the whole fan system and vibration signals acquired by each A-type sensor into the digital twinborn model to obtain a result output by the digital twinborn model; comparing a result output by the digital twin model with a detection result of the B-type sensor, and updating the simulation model; and judging whether the current fan system resonates or not according to the ratio of the maximum amplitude Smax of all the vibration signals of the fan system to S. According to the method, the resonance problem of the fan system can be recognized in real time, then adjustment measures are triggered, abnormal noise is reduced, and resonance generation nodes are recognized.

The invention belongs to the technical field of converter resonance suppression, and particularly relates to an energy storage system converter resonance suppression method and system. According to the method, the resonance problem can be quickly positioned, targeted measures can be taken, the fluctuation time of the energy storage system is shortened, the regulation and control precision is improved, the dynamic change of the energy storage system and the power grid can be adapted by utilizing historical data of the evaluation time period and dynamic coefficient adjustment of the power grid operation state, and the method has relatively high adaptive capacity; the coupling effect of the internal resonance characteristics of the energy storage system and the external power grid state is comprehensively considered, and through fusion of two regulation and control coefficients, internal and external collaborative optimization of the energy storage system is realized, the resonance occurrence probability is reduced, a resonance suppression strategy can be continuously optimized, and the reliability and stability of long-term operation of the energy storage system are improved. By effectively inhibiting the resonance phenomenon, energy loss and equipment damage caused by resonance are reduced, the service life of the energy storage system is prolonged, stable operation of a power grid is guaranteed, and efficient utilization of the energy storage system is promoted.

The application discloses a kind of self-adaptive damping multi-resonance suppression methods of large-scale off-grid light hydrogen storage system, comprising:1.Sampling bridge arm side inductance current, error signal is obtained by subtracting given signal from bridge arm side inductance current;2.Error signal is obtained after sliding mode control;3.Output signal is obtained after damping adjustment unit;4.According to the difference of multi-machine parallel working condition, the adaptive adjustment of damping is carried out;5.The modulated signal is sent into space vector modulation unit, and the pulse driving signal of each switching device is output.The application can solve the multi-resonance problem of grid-connected inverter current loop, ensure the stable operation of system while improving dynamic response, and has important theoretical significance and practical value.

The invention relates to a power distribution network user side loop resonance active suppression method and system, which intelligently judges whether the system is in a resonance state or not by monitoring and calculating a harmonic distortion rate and a key frequency point amplitude in real time. When a potential resonance risk is detected, the resonance suppression device is actively started to work, resonance generation conditions are actively damaged, and the resonance suppression device has two control modes: a damping enhancement mode improves system damping by inputting a resistor, and resonance energy accumulation is effectively suppressed; a damping enhancement and frequency deviation cooperative mode is combined with a damping enhancement mode, and the natural resonant frequency of a system is changed by adjusting the switching capacity of a capacitor to deviate from the current harmonic frequency, so that resonance is avoided, and a control algorithm of the active resonance suppression device is realized by a PID algorithm. The method is suitable for the low-frequency harmonic resonance problem caused by the nonlinear load in the user-side low-voltage power distribution network, and is suitable for comprehensive treatment of the resonance problem in industrial, commercial and civil power systems.

To improve adhesive strength and resolve resonance issues. [Solution] The coil device 1 includes a wire 5, a bobbin 3 on which a winding portion 50 of the wire 5 is formed, cores 2a and 2b attached to the bobbin 3, and a cover 4 that protects the winding portion 50. The cover 4 has an opening 46 formed in a position that simultaneously opens at least a portion of the cores 2a and 2b and at least a portion of the bobbin 3 to the outside. The bobbin 3, cores 2a and 2b and the cover 4 are fixed together with adhesive 8a provided in the opening 46.

The low-noise compressor shell comprises a shell body, a plurality of craters are arranged on the surface of the shell body, and the craters enable the surface of the shell body to form a honeycomb pitted surface. The surface of the compressor shell is treated to form craters, so that the surface of the shell presents a honeycomb pitted surface effect, the reflection path of sound waves is increased, the penetration of noise is reduced, the inherent frequency of the whole machine is improved and the resonance problem can be effectively avoided through the characteristic that the surface of the shell is uneven.

The present invention discloses a method for preventing resonance in a non-sinusoidal vibration system of a continuous casting mold, which is applied to the control system of the continuous casting mold and includes the following steps: synchronous function calculation: calculating the frequency, amplitude, and skew factor of the vibration trajectory curve according to the vibration system parameters set by the continuous casting operator; calculating the range of exciting harmonic orders. Through the non-sinusoidal vibration system of the mold of the present invention, the exciting harmonic components of the vibration curve can be efficiently identified, and while maintaining the original vibration frequency, the exciting harmonic components can be effectively reduced, equipment resonance can be reduced, and the problems of severe jitter and large yaw of the vibration equipment can be effectively solved. When the non-sinusoidal vibration system of the mold detects that equipment resonance is about to be excited, it can automatically adjust the vibration curve parameters to reduce the exciting harmonic components and eliminate resonance without changing the natural frequency of the vibration equipment, greatly reducing the transformation cost of solving the resonance problem. The present invention is applicable to any form of non-sinusoidal vibration system of the mold.

The present application relates to the technical field of synchronous resonance suppression, and discloses a method and a system for suppressing synchronous resonance in a wind farm. The method includes: performing a group oscillation characteristic decomposition process on the system impedance characteristics and key frequency monitoring points to obtain the disturbance sensitivity index of the fan group and the oscillation source positioning result; performing an impedance reconstruction process on the disturbance sensitivity index and the hierarchical early warning threshold parameters to obtain the cooperative damping parameter of the fan group and the power dynamic distribution coefficient; performing a resonance link tracking process on the oscillation source positioning result, the disturbance sensitivity index of the fan group, and the power dynamic distribution coefficient to obtain the key branch impedance compensation value and the reactive power regulation coefficient, and performing a closed-loop correction process to obtain the suppression control instruction and the dynamic correction parameter. The present application realizes the accurate identification and effective suppression of resonance problems within the scope of the wind farm by establishing a complete technical solution for resonance characteristic identification, risk assessment, group oscillation analysis, and cooperative control.

This utility model discloses a resonance suppression device and electrical equipment, relating to the field of conductive connection technology for filter structures. The resonance suppression device includes a conductive busbar, a conductive connector, and a capacitor. The conductive connector is electrically connected to the conductive busbar. The capacitor is electrically connected to the conductive busbar through the conductive connector. The capacitor is electrically connected to the filter housing through a grounding component and the conductive connector. The conductive busbar, conductive connector, capacitor, and grounding component form a filter circuit, and a damping resistor is connected in series in the filter circuit. The technical solution provided by this utility model can solve the EMI resonance problem of existing filters.