Method and device for control of a series-compensated converter station
First Claim
1. A method for control in inverter operation of a series-compensated converter station included in an installation for transmission of high-voltage direct current, the converter station comprising a converter which is controlled by control equipment and which is connected to a three-phase alternating-voltage network by means of series-connected capacitors, comprising the steps of:
- the control equipment generating an ordered value of a control angle for valves included in the converter in dependence on a variable limiting signal, continuously calculating a calculating value of a control angle for the converter according to a relationship which at least approximately expresses said control angle as a function of a current and of a voltage in the converter station, at a commutating margin for the valves equal to a preselected value, and forming the limiting signal in dependence on said calculating value of said control angle.
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Accused Products
Abstract
Control equipment (CE2) generates an ordered value (AOL) of a control angle (α) in dependence on a limiting signal (AMAXL), capable of being influenced, for a converter included in a series-compensated converter station. A calculating value (AMARG) of a control angle is calculated continuously according to a predetermined relationship (M0, M1, M2, M3) which at least approximately resembles a relationship according to which, at a commutating margin (γm) equal to a preselected value (γp), said control angle is a function (F0) of a current (Id2) and a voltage (Un2) in the converter station and the limiting signal is formed in dependence on the calculating value.
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Citations
10 Claims
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1. A method for control in inverter operation of a series-compensated converter station included in an installation for transmission of high-voltage direct current, the converter station comprising a converter which is controlled by control equipment and which is connected to a three-phase alternating-voltage network by means of series-connected capacitors, comprising the steps of:
the control equipment generating an ordered value of a control angle for valves included in the converter in dependence on a variable limiting signal, continuously calculating a calculating value of a control angle for the converter according to a relationship which at least approximately expresses said control angle as a function of a current and of a voltage in the converter station, at a commutating margin for the valves equal to a preselected value, and forming the limiting signal in dependence on said calculating value of said control angle. - View Dependent Claims (2, 3, 4, 5)
- 6. A device for control in inverter operation of a series-compensated converter station included in an installation for transmission of high-voltage direct current, the converter station comprising a converter which is controlled by control equipment and which is connected to a three-phase alternating-voltage network by means of series-connected capacitors, the control equipment comprising a control angle unit for generating an ordered value of a control angle for valves included in the converter in dependence on a variable limiting signal, wherein the control equipment further comprises a calculating unit which continuously calculates a value of a control angle for the converter according to a relationship which at least approximately expresses said control angle, at a commutating margin for the valves equal to a preselected value, as a function of a current and of a voltage in the converter station, and the limiting signal is formed in dependence on said calculated value of said control angle.
Specification