Abstract: A method for the closed-loop control of current converters for adjusting the counter-voltage in a multi-phase electric energy transmission network having a multi-phase connection line. In order to be parameterize in various operating states, phase currents are registered on the connection line and transformed into system current components by way of transformation, voltages are registered on the phases of the connection line, and counter-system voltage components are formed therefrom by way of transformation, which are supplied to a voltage controller. Counter-system current components serving to reduce the counter-system are formed in the voltage controller, which are supplied to a target value input of a current controller. System current components are connected to an actual value input of the current controller, the output parameters thereof serving after retransformation as switching currents for switching units of the current converter.

Abstract: A device has a converter which is connected to a direct voltage circuit through a short-circuit protection unit. The short-circuit protection unit is arranged at least partially in the direct voltage circuit and is provided in the direct voltage circuit to suppress short-circuit current flowing through the converter. The device contains one or more controllable power semiconductors, wherein a protection element is arranged in parallel to at least one of the controllable power semiconductors. The device prevents the negative effects of a short circuit occurring in the direct voltage network in a particularly reliable manner. For this purpose, the protection element is an energy store.

Abstract: In the method for closed-loop control of at least two converters in an energy transmission and/or distribution system, each rectifier regulator and each inverter regulator provides a differential DC voltage from the difference between a given set DC voltage and the relevant received measured DC voltage, and also provides a differential DC current from a differential DC current from the difference between a set DC current and the corresponding received measured DC current. Each converter is a self-commutated converter with power semiconductors. The rectifier regulation of the provided converter is regulated such that the sum of the product of the differential voltages and the value of given set DC current at the corresponding rectifier and the differential current is a minimum. The inverter regulation regulates the corresponding inverter such that the sum between the differential voltage and the differential current is a minimum.

Abstract: A method for the closed-loop control of current converters for adjusting the counter-voltage in a multi-phase electric energy transmission network having a multi-phase connection line. In order to be parameterize in various operating states, phase currents are registered on the connection line and transformed into system current components by way of transformation, voltages are registered on the phases of the connection line, and counter-system voltage components are formed therefrom by way of transformation, which are supplied to a voltage controller. Counter-system current components serving to reduce the counter-system are formed in the voltage controller, which are supplied to a target value input of a current controller. System current components are connected to an actual value input of the current controller, the output parameters thereof serving after retransformation as switching currents for switching units of the current converter.

Abstract: A device has a converter which is connected to a direct voltage circuit through a short-circuit protection unit. The short-circuit protection unit is arranged at least partially in the direct voltage circuit and is provided in the direct voltage circuit to suppress short-circuit current flowing through the converter. The device contains one or more controllable power semiconductors, wherein a protection element is arranged in parallel to at least one of the controllable power semiconductors. The device prevents the negative effects of a short circuit occurring in the direct voltage network in a particularly reliable manner. For this purpose, the protection element is an energy store.

Abstract: A closed-loop control method for at least two converters in an energy transmission and/or distribution system. The converters may be controlled either as rectifier or inverter and they are connected to each other by a DC link. A measured DC voltage and a measured DC current is measured at each converter and transmitted to a rectifier regulator for regulating the corresponding rectifier or to an inverter regulator for regulating the corresponding inverter. Each rectifier regulator and each inverter regulator gives the difference between a given set DC voltage and the relevant received measured DC voltage to give a differential DC voltage and the difference between a set DC current and the corresponding received measured DC current to give a differential DC current.

Abstract: A cost-effective device for influencing the transmission of electrical energy of an alternating voltage line with a plurality of phases has phase modules, which each have an alternating voltage terminal for connecting to a phase of the alternating voltage line and two connecting terminals. A phase module branch extends between each connecting terminal and each alternating voltage terminal. The phase module branch is formed of a series connection of sub-modules, each having a power semiconductor circuit and an energy accumulator connected in parallel to the power semiconductor circuit. The connecting terminals are connected to one another. The power semiconductor circuit is equipped with power semiconductors that can be switched off and are connected to each other in a half bridge.

Abstract: At least three power converters in a power distribution and power transmission system can be controlled as rectifiers or inverters and are connected together by a direct current network. A measuring direct current voltage and a measuring direct current are measured on each power converter and respectively, transmitted to the respective rectifier control and/or inverter control, and a rectifier desired direct power and/or inverter desired direct power is determined for each power converter.

Abstract: In a method for controlling a rectifier and an inverter, which are connected together by a direct current circuit, a measuring direct current voltage and respectively, a measuring direct current are measured at at least one measuring point of the direct current circuit and are transmitted to a direct current control for controlling the rectifier and/or an inverter control for controlling the inverter. The direct current control controls the rectifier in such a manner that a total of a difference direct current voltage and a differential direct current is minimal and the inverter control of the inverter is controlled in such a manner that the difference between the differential direct current of the differential direct current voltage is minimal. The method is reliable and is economical. Accordingly, the desired flow of the direct current control and the desired flow of the inverter control are identical.

Abstract: A cost-effective device for influencing the transmission of electrical energy of an alternating voltage line with a plurality of phases has phase modules, which each have an alternating voltage terminal for connecting to a phase of the alternating voltage line and two connecting terminals. A phase module branch extends between each connecting terminal and each alternating voltage terminal. The phase module branch is formed of a series connection of sub-modules, each having a power semiconductor circuit and an energy accumulator connected in parallel to the power semiconductor circuit. The connecting terminals are connected to one another. The power semiconductor circuit is equipped with power semiconductors that can be switched off and are connected to each other in a half bridge.

Abstract: At least three power converters in a power distribution and power transmission system can be controlled as rectifiers or inverters and are connected together by a direct current network. A measuring direct current voltage and a measuring direct current are measured on each power converter and respectively, transmitted to the respective rectifier control and/or inverter control, and a rectifier desired direct power and/or inverter desired direct power is determined for each power converter.

Abstract: In a method for controlling a rectifier and an inverter, which are connected together by a direct current circuit, a measuring direct current voltage and respectively, a measuring direct current are measured at at least one measuring point of the direct current circuit and are transmitted to a direct current control for controlling the rectifier and/or an inverter control for controlling the inverter. The direct current control controls the rectifier in such a manner that a total of a difference direct current voltage and a differential direct current is minimal and the inverter control of the inverter is controlled in such a manner that the difference between the differential direct current of the differential direct current voltage is minimal. The method is reliable and is economical. Accordingly, the desired flow of the direct current control and the desired flow of the inverter control are identical.

Abstract: In order to permit an improved operational performance of DC transmission, a method is provided which has an associated control arrangement and control device (11a, 11b) and in which, starting from a common working point (A) with predetermined current and voltage values (UA, IA) the respective control devices (11a, 11b) of converters (5a, 5b) respectively assigned to three-phase systems (3a, 3b) are respectively fed system deviations (.DELTA.Aa, .DELTA.Ab) relative to the working point (A). The respective controlled variable is employed in order to reach the working point (A), minimizing the respective system deviation (.DELTA.Aa, .DELTA.Ab). The control method and the associated devices preferably operate according to the principle of vectorial control.

Abstract: To provide for an improved operating characteristic of a direct-current transmission between static converters (5a, 5b) of a high-voltage direct-current transmission installation, a method and an arrangement (1a) are provided in which the static converters (5a, 5b) are in each case supplied with control signals (.alpha.a, .alpha.b) which are assembled from part-control signals (.alpha.i to .alpha.n). The closed-loop control devices (11a, 11b) preceding the static converters (5a, 5b) are constructed as vector controllers in this arrangement.

Abstract: In order to improve the operation of a dc transmission unit (GU) between a rectifier (R) and an inverter (I), an extinction angle signal (LS) of the inverter (I) is fed as reference variable to the rectifier regulator (RR). A current signal (ID) of the dc transmission unit (GU) is preferably fed to an inverter regulator (IR) of the inverter (I) as input variable. In addition, the current signal (ID) can be fed as input variable to the rectifier regulator (RR) for the start-up and/or in the event of a malfunction. Another solution consists of a circuit arrangement (S1, S2, S3) for the carrying out of the method.