Converter arrangement having a filter
View Patent ↗A converter arrangement has at least one AC voltage connection, at which an alternating current can be fed in or drawn, and at least one DC voltage connection, at which a direct current can be fed in or drawn. The converter arrangement contains at least two series circuits connected in parallel. The external connections of the series circuits form the DC voltage connections of the converter arrangement. Each of the series circuits is connected in parallel and contains in each case at least two submodules connected in series, each of the submodules containing at least two switches and a capacitor. An energy store is to be connected to the capacitor of at least one of the submodules, wherein a filter is connected electrically between the capacitor and the energy store.
1. A converter configuration, comprising:
at least one AC voltage connection at which an alternating current can be fed in or drawn;
at least one DC voltage connection at which a direct current can be fed in or drawn;
at least two series circuits connected in parallel and having external connections forming said at least one DC voltage connection, each of said series circuits connected in parallel containing in each case at least two sub modules connected in series, each of said sub modules containing at least two switches and a capacitor;
an energy storage device coupled to said capacitor of at least one of said sub modules; and
a filter connected electrically between said capacitor and said energy storage device, said filter selected from the group consisting of a low-pass filter and a band-pass filter, said filter having at least one of a limit frequency or an upper limit frequency being lower than a fundamental frequency of an alternating voltage present at said at least one AC voltage connection, the limit frequency of said low-pass filter or the upper limit frequency of said band-pass filter is maximally as large as half of the fundamental frequency of the alternating voltage present at said at least one AC voltage connection.
2. The converter configuration according to claim 1 , wherein said filter attenuates at least the fundamental frequency of the alternating voltage present at said at least one AC voltage connection.
3. The converter configuration according to claim 1 , wherein said filter attenuates at least one of a first harmonic or a second harmonic of the alternating voltage present at said at least one AC voltage connection.
4. The converter configuration according to claim 1 , wherein said filter is selected from the group consisting of active filters and passive filters.
5. The converter configuration according to claim 1 , wherein said energy storage device has an energy storage capacitance being at least 100 times an energy storage capacitance of said capacitor.
6. The converter configuration according to claim 1 , wherein said energy storage device is selected from the group consisting of an electrochemical energy storage device and a rechargeable battery.
7. The converter configuration according to claim 1 , wherein the converter configuration operates in a multiphase fashion and includes, per phase, at least one said of said series circuits with in each instance at least two of said sub modules connected in series.
8. An energy distribution system for supplying a supply area with electrical energy, the energy distribution system comprising:
at least one connection for feeding in electrical energy;
a plurality of connections for drawing the electrical energy fed-in;
a converter configuration containing:
at least one AC voltage connection at which an alternating current can be fed in or drawn;
at least one DC voltage connection at which a direct current can be fed in or drawn;
at least two series circuits connected in parallel and having external connections forming said at least one DC voltage connection, each of said series circuits connected in parallel containing in each case at least two sub modules connected in series, each of said sub modules containing at least two switches and a capacitor;
an energy storage device coupled to said capacitor of at least one of said sub modules; and
a filter connected electrically between said capacitor and said energy storage device, said filter selected from the group consisting of a low-pass filter and a band-pass filter, said filter having at least one of a limit frequency or an upper limit frequency being lower than a fundamental frequency of an alternating voltage present at said at least one AC voltage connection, the limit frequency of said low-pass filter or the upper limit frequency of said band-pass filter is maximally as large as half of the fundamental frequency of the alternating voltage present at said at least one AC voltage connection; and
said at least one connection of said energy distribution system for feeding in the electrical energy is formed by said at least one AC voltage connection of said converter configuration, and at least one subset of said connections for drawing the electrical energy fed-in is formed by connections of said sub modules of said converter configuration and at least one subset of said connections of said sub modules of said converter configuration being used to store or buffer energy.
9. The energy distribution system according to claim 8 , wherein said sub modules are locally distributed by way of the supply area to be supplied with the electrical energy by the energy distribution system.