96 results about "Shunt active power filter" patented technology
Filter
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
A shunt active filter senses the load current and injects a current into the system to compensate current harmonics or reactive load. In this paper a shunt filter is used to compensate the current harmonics of matrix converter here the shunt active filter acts as a current source.
The invention discloses an integral power qualityregulator. The integral power qualityregulator comprises series-connection and parallel-connection active power filter units, a measuring unit and a control unit, wherein the parallel-connection active power filter unit and a parallel-connection passive filter unit are serially connected to each other to form a parallel-connection unit and are connected to a system in parallel; the series-connection active power filter unit is controlled by a series-connection control unit, and outputs sine-wave current by driving switch tubes of a first inverter unit; the parallel-connection active filter unit is controlled by a parallel-connection control unit and outputs appointed voltage by driving various switch tubes of a second inverter; and the parallel-connection passive filter unit is an LC (liquid chromatography) filter circuit, and is used for providing low-impedance access for load harmonic current and compensating reactive power of a load. By the integral power qualityregulator, the shortcoming that the original parallel-connection active filter is high in capacity and high in manufacturing cost is overcome; a detection and control system is simple; an output tracking effect is high; a compensation effect is high; cost performance is also high; and hardware implementation is facilitated.
The invention discloses a double-resonance three-phase active power filter, and a control method and device, and solves the problems that in the prior art, the passive power filter is composed of an electric reactor, a capacitor and a resistor, while the compensation reactive power is achieved, the function of restraining the specific harmonic current is often taken into consideration, the passivepower filter is simple in structure and low in cost, but the influence of the frequency fluctuation of the power grid and other loads is large, and the technical problem that the performance of the filter is greatly influenced due to detuning of the filter is solved; the active power filter is a device for dynamically compensating harmonic current, all harmonic currents can be compensated, and specific harmonic currents can be compensated, but the active power filter is limited by the working voltage of the power electronic power device, and the cost is increased along with the increasing ofcapacity, and therefore the active power filter has the technical problem of being not suitable for a high-voltagesystem.