Charging an energy store

Abstract

The invention relates to a system for charging at least one energy storing cell (5) in a controllable energy store (2) that is used to control and supply electric energy to an n-phase electric machine (1), wherein n>=1. The controllable energy store (2) has n parallel energy supply branches (3-1, 3-2, 3-3), each of which has at least two serially connected energy storing modules (4), each said energy storing module comprising at least one electric energy storing cell (5) with a corresponding controllable coupling unit (6). The energy supply branches (3-1, 3-2, 3-3) can be connected to a reference bus (T-), and each energy supply branch can be connected to a phase (U, V, W) of the electric machine (1). The coupling units (6) bridge the respective corresponding energy storing cells (5) or connect same into the respective energy supply branch (3-1, 3-2, 3-3) dependent on control signals. The aim of the invention is to allow at least one energy storing cell (5) to be charged. This is achieved in that each energy supply branch (3-1, 3-2, 3-3) can be connected to and separated from a secondary side (9-1'; 9-1''; 9-2'; 9-2''; 9-3'; 9-3'') of a charging transformer (10'; 10-1''; 10-2''; 10-3'') by a respective controllable switching element (21-1; 21-2; 21-3), an additional charging inductor (20-1; 20-2; 20-3) being arranged in each connecting line between the energy supply branches (3-1, 3-2, 3-3) and the secondary sides (9-1'; 9-1''; 9-2'; 9-2''; 9-3'; 9-3'') of the charging transformer (10'; 10-1''; 10-2''; 10-3'').

Description

technical field [0001] The invention relates to a system for charging an energy store and a method for operating a charging system according to the invention. Background technique [0002] It has been shown that electronic systems combining new energy storage technology with electric drive technology will be increasingly used in the future both in stationary applications such as wind power plants and in vehicles such as hybrid or electric vehicles. In conventional applications, an electric machine, for example embodied as an induction machine, is controlled via a converter in the form of an inverter. Typical of such systems is a so-called direct voltage intermediate circuit via which an energy store, generally a battery, is connected to the direct voltage side of the inverter. In order to be able to meet the power and energy requirements given for the respective application, a plurality of battery cells are connected in series. Since the current provided by such an energy ...

AI Technical Summary

Problems solved by technology

In other applications, such as the adjustment of rotor blades in wind power plants, unfavorable frame conditions, such as strong winds, can even lead to safety-threatening situations

Images