49results about How to "Oscillation amplitude is small" patented technology

The invention discloses a multivariable feedback control type three-phase LCL networking converter and a method. The networking converter comprises a first summator, a second summator, a third summator, a fourth summator, a first controller, a second controller, a first compensator and a second compensator. An input end of the first controller is connected to an output end of the first summator, a first input end of the third summator is connected to an output end of the first controller, a second input end of the third summator is connected to an output end of the first compensator, and an input end of the first compensator is connected with a state quantity. The third summator outputs d-axis modulating signals. An input end of the second controller is connected to an output end of the second summator, a first input end of the fourth summator is connected to an output end of the second controller, a second input end of the fourth summator is connected to an output end of the second compensator, and an input end of the second compensator is connected with the state quantity. The fourth summator outputs q-axis modulating signals. The multivariable feedback control type three-phase LCL networking converter and the method have advantages of high stability, high steady state precision, low dynamic response fluctuation and high speed.

The invention provides a rolling mechanism of a wood working machine transmission shaft. A power mechanism is used for providing rotating force of the transmission shaft and assembled in a box. The box is connected with a stabilization bar in a pivoted manner, and the stabilization bar positions a stabilization plate. A thumb-index web is arranged on the stabilization plate, and a rolling mechanism body is connected to each of the two ends of the thumb-index web in a pivotal manner. At least one saw web and the transmission shaft are connected to the rolling mechanism bodies. The rolling mechanism is characterized in that the rolling mechanism body is connected to each of the two ends of the thumb-index web in the pivotal manner and comprises two sheet bars and a positioning ring, wherein the sheet bars are connected to the two ends of the thumb-index web in a pivotal manner, the positioning ring is combined to the transmission shaft and rotates along with the transmission shaft, at least one concave ring is arranged on the periphery of the positioning ring, the peripheral edges of the sheet bars enter and are clamped in the concave ring, and the transmission shaft is positioned in an inner ring of the positioning ring; and the positioning ring of the transmission shaft can smoothly rotate and be stably supported through the sheet bars of the stabilization plate, the sheet bars are arranged at the outer portion of the positioning ring, and assembling and disassembling are easy.

The invention provides an alternating current channel transmission capacity optimization method and device in an alternating current / direct current hybrid power system. The method comprises the stepsthat double-machine equivalence is carried out on a transmission-side alternating current system according to the dynamic response curve of an alternating current / direct current hybrid power grid, soas to acquire a leading generator group and a hysteresis generator group; Thevenin equivalence is carried out on the alternating current / direct current hybrid power grid from the direct current side according to the leading generator group and the hysteresis generator group; and finally the operation mode of the alternating current / direct current hybrid power grid is adjusted according to the Thevenin equivalence result of the alternating current / direct current hybrid power grid; and the alternating current channel transmission capacity is optimized in the direct current hybrid power grid. According to the invention, the problem that an alternating current channel is impacted by the collapse of the transmission power of a direct current transmission system during a recovery process and thevoltage drop of a direct current conversion bus after the generator group oscillating aroused by certain faults in the transmission-side alternating current system is solved; and reference is provided for a power grid operator to arrange the operation mode of the alternating current / direct current hybrid power grid reasonably to ensure safe and stable operation of the alternating current / direct current hybrid power grid.

The invention relates to fishing, in particular, artificial baits, namely, the oscillating lures, and can be used by amateur fishermen while fishing. The lure comprises the elongated body with a weight, an opening for attaching a fishing line and at least one hook. The front, lower or tail portion of the body is provided with a plate holder having a ring at the end, said ring passing with a gap through two openings which are divided by a crosspiece and are arranged in the middle part of the plate on the vertical or horizontal axis at equal proximity to the center of symmetry thereof. The lateral portions of the plate are symmetrically convex (curved) relative to the vertical axis. The plate is fastened in an articulated manner to the ring and can be inclined in different planes from a central position perpendicular to the longitudinal axis of the lure, with the convex (curved) lateral portions of the plate being pointed forward in the direction of the lure movement. The result is a lure that works very effectively and carries out its function at a minimal execution rate, with a wide range of oscillations, namely, from aggressively vibrating oscillations with a high frequency and low amplitude to the oscillations working more gently and at a low frequency with an increase in the oscillation amplitude and without tangling the fishing line around the hook, and which would have ability of providing effective oscillations under condition of changing direction and speed of movement.