Granted Patent B2

US 12,651,960 · App. 18/521,611 · Granted Jun 9, 2026

Inventors: Peter Unruh (Kassel, DE); Tobias Erckrath (Kassel, DE)

Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.

H02M1/325H02H9/02H02M1/0025H02M7/5387H02M7/5395H02M1/08H02M3/33561

Abstract

Claims (88)

1 . Regulation apparatus for a power converter,

wherein the regulation apparatus is configured to determine a control voltage for the power converter in dependence on an output voltage of the power converter, wherein the regulation apparatus is configured to

limit an amplitude of a control voltage phasor describing the control voltage to an amplitude control range around an amplitude of a reference voltage phasor based on the output voltage,

limit an angle of the control voltage phasor to an angle control range around an angle of the reference voltage phasor and

adjust the amplitude control range and the angle control range depending on the situation.

2 . Regulation apparatus according to claim 1 , configured to switch between a first way of adjusting the amplitude control range and the angle control range and a second way of adjusting the amplitude control range and the angle control range depending on whether the power converter is in normal operation or in a failure situation.

3 . Regulation apparatus according to claim 1 , configured to

determine an upper and a lower limit of the amplitude control range based on a first deviation limiting value and the amplitude of the reference voltage phasor,

determine an upper and a lower limit of the angle control range based on a second deviation limiting value and the angle of the reference voltage phasor and

adjust the first deviation limiting value and the second deviation limiting value in dependence on each other to limit a deviation of the control voltage phasor from the reference voltage phasor.

4 . Regulation apparatus according to claim 1 , configured to, in at least a first operating situation of one or several operating situations of the power converter,

adjust the angle control range to a predetermined angle control range and

determine the amplitude control range in dependence on an angle deviation of the control voltage phasor from the reference voltage phasor.

5 . Regulation apparatus according to claim 4 , configured to, in a second operating situation of the power converter,

adjust the amplitude control range to a predetermined amplitude control range and

determine the angle control range in dependence on an amplitude deviation of the control voltage phasor from the reference voltage phasor.

6 . Regulation apparatus according to claim 1 , configured to

determine an upper and a lower limit of the amplitude control range based on a first deviation limiting value and the amplitude of the reference voltage phasor,

determine an upper and a lower limit of the angle control range based on a second deviation limiting value and the angle of the reference voltage phasor and

adjust, at least in a first operating situation of the power converter, the first deviation limiting value and the second deviation limiting value to a respective first predetermined value and

adjust, in a second operating situation of the power converter, the first deviation limiting value and the second deviation limiting value to a respective second value, wherein the respective first value differs from the respective second value.

7 . Regulation apparatus according to claim 1 , configured to

determine the angle control range in dependence on the amplitude of the control voltage phasor and/or in dependence on the amplitude of the reference voltage phasor and/or

determine the amplitude control range in dependence on an angle deviation of the control voltage phasor from the reference voltage phasor.

8 . Regulation apparatus according to claim 1 , configured to determine an upper and a lower limit of the amplitude control range based on a first deviation limiting value and the amplitude of the reference voltage phasor.

9 . Regulation apparatus according to claim 1 , configured to determine an upper and a lower limit of the angle control range based on the angle of the reference voltage phasor and based on a ratio between a second deviation limiting value and the amplitude of the control voltage phasor or the reference voltage phasor.

10 . Regulation apparatus according to claim 1 , configured to

determine a set control voltage based on a comparison of one or several quantities describing an output power of the power converter with one or several set values for the quantities and

supply the set control voltage to the limitation to determine the control voltage.

11 . Regulation apparatus according to claim 1 , wherein the regulation apparatus is configured to

limit a first coordinate of a set control voltage phasor of the set control voltage to a first control range and to limit a second coordinate of the set control voltage phasor to a second control range to determine the control voltage phasor and

determine the first and the second coordinate of the set control voltage phasor by using respective integrators and

lead, in the case of a deviation of a first coordinate of the control voltage phasor from the first coordinate of the set control voltage phasor, an integrator input quantity of the integrator used for determining the first coordinate of the set control voltage phasor to zero, or to reinitialize the integrator used for determining the first coordinate of the set control voltage phasor and

lead, in the case of a deviation of a second coordinate of the control voltage phasor from the second coordinate of the set control voltage phasor, an integrator input quantity of the integrator used for determining the second coordinate of the set control voltage phasor to zero, or to reinitialize the integrator used for determining the second coordinate of the set control voltage phasor.

12 . Regulation apparatus according to claim 1 , wherein the power converter is a multi-phase power converter, wherein the regulation apparatus is configured to determine, for each of a plurality of the phases of the power converter, one control voltage each, depending on an output voltage of the respective phase and

wherein the regulation apparatus is configured to determine, for each of the phases, a control voltage phasor describing the respective control voltage and to limit the respective control voltage phasor to a control range for each of the phases separately.

13 . Regulation apparatus according to claim 1 , wherein the power converter is a three-phase power converter, wherein the power converter is configured to provide, in dependence on the control voltage, one voltage each for a first, a second and a third phase of the three-phase power converter,

wherein the regulation apparatus is configured to

obtain a positive-phase sequence system reference voltage phasor, a negative-phase sequence system reference voltage phasor and zero-phase sequence system reference voltage phasor, which together describe respective output voltages of the first, second and third phases,

limit a positive-phase sequence system control voltage phasor describing a positive-phase sequence system of the control voltage to a control range around the positive-phase sequence system reference voltage phasor,

limit a negative-phase sequence system control voltage phasor describing a negative-phase sequence system of the control voltage to a control range around the negative-phase sequence system reference voltage phasor,

limit a zero-phase sequence system control voltage phasor describing a zero-phase sequence system of the control voltage to a control range around the zero-phase sequence system reference voltage phasor.

14 . Power converter arrangement, comprising:

the regulation apparatus according to claim 1 ,

a power converter comprising a circuit node,

wherein the power converter is configured to provide a voltage indicated by the control voltage at the circuit node,

wherein the circuit node can be coupled to an energy grid via an internal impedance of the power converter.

15 . Regulation apparatus for a power converter,

wherein the regulation apparatus is configured to determine a control voltage for the power converter in dependence on an output voltage of the power converter, wherein the regulation apparatus is configured to

limit a first coordinate of a control voltage phasor describing the control voltage to a first control range around a first coordinate of a reference voltage phasor based on the output voltage,

limit a second coordinate of the control voltage phasor to a second control range around a second coordinate of the reference voltage phasor,

wherein a first coordinate axis to which the first coordinates are related and a second coordinate axis to which the second coordinates are related are orthogonal to each other and rectilinear.

16 . Regulation apparatus according to claim 15 , configured to

limit a deviation of the first coordinate of the control voltage phasor from the first coordinate of the reference voltage phasor to a first deviation limiting value and

limit a deviation of the second coordinate of the control voltage phasor from the second coordinate of the reference voltage phasor to a second deviation limiting value.

17 . Regulation apparatus according to claim 15 , configured to adjust the first control range and the second control range depending on the situation.

18 . Regulation apparatus for a power converter,

wherein the regulation apparatus is configured to determine a control quantity for the power converter,

wherein the power converter comprises an intermediate circuit, wherein the power converter is configured to provide a bridge voltage indicated by the control quantity based on the control quantity and an intermediate circuit voltage of the intermediate circuit at a circuit node coupled to a terminal point of the power converter via an internal impedance of the power converter,

wherein the regulation apparatus is configured to, for the control quantity,

consider a contribution of a least one voltage oscillation in the intermediate circuit to the bridge voltage and/or

consider a potential difference between a reference potential of the bridge voltage and a reference potential of the output voltage.

19 . Regulation apparatus according to claim 18 , wherein the voltage oscillation is a voltage oscillation between an intermediate circuit voltage supply and a further intermediate circuit voltage supply or between an intermediate circuit voltage supply and a reference potential of the intermediate circuit.

20 . Regulation apparatus according to claim 18 , wherein a frequency of the voltage oscillation is one or several times a fundamental oscillation of the bridge voltage.

21 . Regulation apparatus according to claim 18 , wherein the regulation apparatus is configured to

determine a control voltage for the power converter in dependence on an output voltage of the power converter and

determine the control quantity based on the control voltage,

wherein the regulation apparatus is configured to

consider the contribution of the voltage oscillation and/or the potential difference for determining the control voltage or

determine the control quantity based on the control voltage and based on

the contribution of the voltage oscillation and/or

the potential difference.

22 . Method for regulating a power converter comprising:

determining a control voltage for the power converter in dependence on an output voltage of the power converter, determining the control voltage comprising:

limiting an amplitude of a control voltage phasor describing the control voltage to an amplitude control range around an amplitude of a reference voltage phasor based on the output voltage,

limiting an angle of the control voltage phasor to an angle control range around an angle of the reference voltage phasor and

adjusting the amplitude control range and the angle control range depending on the situation.

23 . Method for regulating a power converter, comprising:

determining a control voltage for the power converter in dependence on an output voltage of the power converter, determining the control voltage comprising:

limiting a first coordinate of a control voltage phasor describing the control voltage to a first control range around a first coordinate of a reference voltage phasor based on the output voltage,

limiting a second coordinate of the control voltage phasor to a second control range around a second coordinate of the reference voltage phasor,

wherein a first coordinate axis to which the first coordinates are related and a second coordinate axis to which the second coordinates are related are orthogonal and rectilinear to each other.

24 . Method for regulating a power converter, comprising:

determining a control quantity for the power converter,

providing a bridge voltage indicated by the control quantity at a circuit node coupled to a terminal point of the power converter via an internal impedance of the power converter, wherein providing takes place based on the control quantity and an intermediate circuit voltage of an intermediate circuit of the power converter,

wherein the method comprises, for determining the control quantity

considering a contribution of at least one voltage oscillation in the intermediate circuit to the bridge voltage and/or

considering a potential difference between a reference potential of the bridge voltage and a reference potential of the output voltage.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (15)