41results about How to "Improve voltage waveform" patented technology

The invention discloses a microgrid inverter multi-loop control method based on a virtual synchronous generator, and the method comprises power control of an outer loop and voltage current control of an inner loop. The power control of the outer loop comprises the following steps: measuring the three-phase voltage and current of an output side of an inverter, calculating active power and reactive power according to the instantaneous power theory, carrying out calculation and regulation through an active power-frequency equation, a reactive frequency equation, a torque inertia equation and an electromagnetic transient equation of a synchronous motor, obtaining the amplitude of an output voltage and a phase angle given value, and then carrying out modulation through voltage and current double loops. The method can achieve the non-corresponding control of voltage size and frequency well, outputs active and reactive power, can achieve precise manual control, and has the characteristics of V / F and PQ control. When a fault happens to a power grid, the method can simulate the primary modulation, primary voltage regulation and inertia characteristics of the synchronous generator, participates in the power grid adjustment, provides frequency and voltage support, and facilitates the stabilization of the power grid.

The invention belongs to the technical field of harmonic treatment, and provides a harmonic suppression circuit for an electromagnetic compatibility laboratory and a compensation method thereof. The circuit and the method thereof adopt two-stage tandem type active power filters connected in series in the forward direction, and a dry-type iron core reactor is connected in parallel between the tandem type active power filters and the power source end of a load. The dry-type iron core reactor is mainly used for restraining high-frequency interference with a frequency higher than 10 KHz, cannot influence the filter performance of the tandem type active power filters, is the major support equipment of a reactive compensation device in an electric system, can effectively restrain higher harmonic, limits the switching-on flashy current and switching overvoltage, improves the voltage waveform of the system, increases the power factor, and plays a greater function for the safe operation of a power capacitor and other electric equipment. Therefore, the dry-type iron core reactor connected in parallel connection guarantees the safe operation of other equipment in the electromagnetic compatibility laboratory, voltage change of inlets of all loads can be compensated, the detection reliability and accuracy in electromagnetic compatibility of the product can be improved.

The invention discloses a mechanical energy storage type highway speed bump power generation device comprising a mechanical transmission part and an energy storage power generation part. The mechanical transmission part mainly comprises a speed bump, a supporting frame, a metal strip, a first crank, a second crank and a driving swing rod, wherein the first crank, the second crank and the driving swing rod are sequentially hinged; one end of the first crank is hinged to the metal strip, the other end of the first crank and the second crank are jointly hinged to a sliding block, the sliding block is mounted in a guiding groove in a supporting plate, and a return spring is mounted on the lower portion of the sliding block in the guiding groove; a driving pawl of a ratchet wheel structure andthe driving swing rod are fixed, a rotating shaft is fixedly connected with a first one-way clutch and a second one-way clutch which are opposite in linkage direction, and the outer circle of the first one-way clutch is fixedly connected with a ratchet wheel; the energy storage power generation part comprises a power generator and a spring-type elastic energy storage device, a mounting gear is arranged on a power generator shaft, and the mounting gear is engaged with an external gear at the outer circle of the second one-way clutch. According to the mechanical energy storage type highway speedbump power generation device, the multistage variable speed is set, the high transmission ratio is achieved as much as possible through the smallest space, mounting is convenient, and the power generation amount is large.