4results about How to "Improve harmonic performance" patented technology

The embodiment of the present invention discloses a small hybrid mode filter with two resonant cavities, belonging to the field of communication technology. The filter comprises: n resonant cavities connected in series, and a metal sheet is spaced between each two adjacent resonant cavities, n≥3; the first and last resonant cavities of the n resonant cavities are metal resonant cavities, and the remaining n‑2 resonant cavities are dielectric dual-mode resonant cavities; the n resonant cavities are coupled through the coupling window on the metal sheet. The filter provided by the embodiment of the present invention has the characteristics of compact size, low loss, large power capacity, high out-of-band suppression, and good harmonic performance, so as to effectively improve the anti-interference ability and spectrum utilization of the 5G communication system, reduce the power consumption of the 5G communication system, and improve the coverage of the 5G communication system.

The invention relates to the technical field of motor design, and particularly discloses a method for designing a high-torque permanent magnet motor based on modulation tooth editing and electronic equipment, and the method comprises the steps: analyzing a magnetic field path generated by a permanent magnet on a rotor in a no-load state of the motor, selecting a basic unit to represent the whole rotor structure, and establishing an expression of permanent magnet magnetomotive force according to the basic unit; the distribution characteristics of modulation teeth on a stator are analyzed, a basic unit is selected to represent the whole stator structure, a periodic air gap magnetic conductance mathematical model is established according to the basic unit, and an expression of an air gap magnetic conductance function is obtained. On the basis of an analytical expression of the output torque, the high-contribution-ratio magnetic field harmonic characteristics are associated with specific design parameters of the motor modulation teeth, the influence rule of the modulation tooth parameters on the high-contribution-ratio magnetic field harmonic and the nonlinear characteristics of the high-contribution-ratio magnetic field harmonic are analyzed in detail, and therefore the harmonic efficiency improved by editing the modulation tooth width and the high-contribution-ratio magnetic field harmonic characteristic improved by editing the modulation tooth width are innovated. And finally, the design method of the output torque is improved.

The embodiment of the invention discloses a new energy grid-connected harmonic suppression regulation and control method and device, electronic equipment and a medium. A specific embodiment of the method comprises the following steps: performing variable window Fourier transform on a power instantaneous value sequence set, and then performing impedance compensation to obtain a compensated power harmonic spectrum diagram set; performing critical point identification on the new energy grid-connected power region to obtain a harmonic resonance critical point set; performing early warning grade division on the harmonic resonance critical point set to obtain an early warning grade critical point set; performing harmonic time sequence prediction on the compensated power harmonic spectrogram and the inverter power information to obtain a harmonic prediction amplitude oscillogram; and performing harmonic suppression control on the early warning grade critical point to obtain grid-connected harmonic regulation and control information, and performing equipment regulation and control processing on the power equipment. According to the embodiment, the early warning accuracy of the harmonic resonance risk and the efficiency of suppressing the harmonic resonance can be improved, the equipment delay is reduced, the safety of the new energy grid-connected equipment is improved, and the power loss is reduced.

The invention relates to the technical field of electric energy storage, in particular to a discontinuous pulse width modulation method and device for a cascaded battery energy storage system, and the method comprises the following steps: obtaining a voltage modulation reference value, and calculating the minimum number of input submodules; dividing each phase of sub-module of the cascaded battery energy storage system into two groups; selecting a plurality of sub-modules from the two groups of sub-modules as clamping sub-modules; performing voltage reference clamping on the clamping sub-module modulation to obtain a clamping sub-module switching signal, and calculating a modulation reference value of a non-clamping sub-module to obtain a non-clamping sub-module switching signal; and the switching signals of the clamping sub-module and the non-clamping sub-module act on the corresponding power devices respectively. According to the method and the device provided by the invention, the equalization capability and the equalization rate of the charge state between the modules in the phase are improved, the number of times of switching actions of the system is reduced, the power loss of the system is reduced, and the harmonic performance is good.