Active filtering system
AssigneeSchneider Electric Industries SAS
InventorRoger Franchino
Life of this patent
Estimating the term…
Abstract
An active filtering system designed to be connected in parallel with an electric power supply network providing a main power supply current including a disturbing current, the system including at least one capacitor, a controlled current generator including an electric power supply intended to generate a positive determined voltage or a negative determined voltage and connected in series with the capacitor, a device for controlling the controlled current generator, designed to generate a compensation current to be applied to the main current in order to compensate the disturbing current while keeping a decoupling current measured at the connection point between the current generator and the capacitor at a value suitable for not saturating the current generator.
Claims6
An active filtering system designed to be connected in parallel with an electric power supply network providing a main power supply current including a disturbing current, said system comprising:
- at least one capacitor;
- a controlled current generator comprising an electric power supply configured to generate a positive determined voltage or a negative determined voltage and being connected in series with at least one the capacitor;
- and
- a control device configured to determine a control value for said controlled current generator so that the controlled current generator generates a compensation current to be applied to the main power supply current in order to compensate the disturbing current, said control value being determined by implementing:
- a first current loop designed to filter the main power supply current in order to obtain a first high-frequency current,
- a second control loop designed to correct the first high-frequency current with a second current that is proportional to a decoupling voltage measured at a connection point between the controlled current generator and said at least one capacitor,
- an adder designed to determine a control parameter by means of a difference between the first high-frequency current and the second current, and
- a hysteresis comparator designed to output said control value to be applied based on said control parameter, which is input.
Dependencies are inferred from the claim text.