5results about How to "Improve attenuation characteristics" patented technology

A common mode noise filter is provided that can improve the attenuation characteristics of common mode noise in a wide frequency range. The common mode noise filter disclosed in the present invention comprises: two magnetic parts (11) and a magnetic part (12) comprising a magnetic body; and a non-magnetic part (13) sandwiched by the magnetic parts (11) and the magnetic parts (12) in the stacking direction and comprising a non-magnetic body. It also comprises: two coils (14) and a coil (15) facing each other and built into the non-magnetic part (13); and a metal layer (16) formed inside at least one of the two magnetic parts (11) and the magnetic part (12) and connected to the ground. The metal layer (16) is located closer to the lower surface than the upper surface of the magnetic part (11), and is located closer to the upper surface than the lower surface of the magnetic part (12).

The utility model belongs to the field of inverters, and specifically provides an inverter topological structure and a photovoltaic inverter wherein the inverter topological structure comprises a DC interface, a six-switch single-phase bridge inverter circuit, an LCL filter circuit and an AC interface; the direct current input side of the six-switch single-phase bridge type inverter circuit is electrically connected with the direct current interface; and the inversion output side of the six-switch single-phase bridge type inversion circuit is electrically connected with the AC interface after being filtered by the filter circuit. The LCL filter circuit is arranged to filter the output voltage of the inverter topological structure, the attenuation characteristic of the filter in a high frequency band is effectively improved, meanwhile, the good gain characteristic of a low frequency band is kept, compared with an L-shaped filter, the equipment cost and size are remarkably reduced, the harmonic wave filtering effect is improved, the output voltage is closer to a pure sinusoidal waveform, and the harmonic wave filtering effect is improved. And the generated reactive power is lower, the power loss is smaller, the voltage stress between the switches is reduced, and the service life of the inverter topological structure is prolonged.

The invention discloses an improved droop control method and system based on an energy storage converter and a medium, and relates to the technical field of power electronic micro-grid control. The system comprises an energy storage device port, a power conversion module, an LCL output filter, a power grid port, at least one load port and a system control module, the LCL output filter is connected with a power grid port through a common coupling point; the energy storage converter converts alternating current of the power grid port into direct current and transmits electric energy to the energy storage battery port and the load port; the system control module detects the difference value between the module output power and the reference power through the improved droop control module. The method has good active and reactive power tracking performance, and can provide inertia and damping links for the system, thereby improving the stability of the system. Meanwhile, the control method can realize smooth switching of the energy storage converter between an off-grid operation mode and a grid-connected operation mode.

This invention provides a vibration damper with excellent damping characteristics. A vibration damper is a vibration damper whose constituent component is a viscoelastic body composed of a rubber composition containing the following components (A) to (C), wherein the number of aggregates of three or more calcium carbonate particles connected together in any 1μm × 1μm square region of a scanning transmission electron microscope image of the viscoelastic body obtained by magnification at 150,000x is in the range of 3 to 15. (A) At least one of styrene-isoprene-styrene copolymer and styrene-butadiene-styrene copolymer. (B) One or more components selected from the group consisting of ethylene-propylene-diene terpolymer, ethylene-butene-diene terpolymer, and butadiene rubber. (C) Calcium carbonate.

A noise filter (1) comprises a first capacitor (16) and a second capacitor (17) as two line capacitors, wherein the currents flowing through the first capacitor (16) and the second capacitor (17) are made to be opposite to each other, and the currents flowing through the first connecting wiring (12) and the second connecting wiring (15) are made to be parallel and in the same direction, so that the connecting wiring and the line capacitors are magnetically coupled, and the residual inductance of the line capacitors themselves is reduced to further improve the attenuation characteristics for normal mode noise.