ACDC converter unit control. According to IEC 60633, it is the control system used for the controlling, monitoring and protection of a single converter unit.

The AC emulation control function is used when AC emulation model is activated for a DC system. It consists in computing the active power set point of the DC system as a function of the voltage angle difference between both points of common coupling with the AC network in order to mimic the behavior of an AC transmission line. This control mode enables the automatic adjustment of the active power reference following variations of the AC system operational point. The setpoint of the DC system is calculated by Psetpoint=Pref+Kdc*(angle1-angle2), where - Pref is the existing active power setpoint; - Kdc is the control system gain and - angle1 and angle2 are the phase angle measurement (measured at points of common coupling with the AC network) respectively at the side 1 and 2 of the DC system.

Active power control function is a function block that calculates operating point of the controlled equipment to achieve the target active power.

Area interchange control is set to control active power of an area.

Automation function is a collection of functional block or other automation function that can be executed as a work cycle program as part of an automated system.

Compensator controller is controlling the equipment to optimize the use of the compensators.

Kind of compensator controller mode.

Control function block is a function block that contains an algorithm for controlling the equipment.

Current control function is a function block that calculates the operating point of the controlled equipment to achieve the target current.

Kind of DC control mode.

DC current control function is a function block that calculates the operating point of the controlled equipment to achieve the target current.

DC voltage control function is a function block that calculate the operating point of the controlled equipment to achieve the target voltage.

DC system bipole control that is the control system of a bipole in accordance with IEC 60633.

Direct current equipment controller used to control different parts of the hierarchical structure of the DC control system defined by IEC 60633.

Direct current system control is a control system which governs the operation of an entire DC system consisting of more than one DC substation and performs those functions of controlling, monitoring and protection which require information from more than one substation. This can also be a multiterminal control which is a DC system control for more that two DC substations or a DC master control, which is a general concept for control coordination of a DC system. The DC master control may be implemented at the bipole and/or pole level as defined in IEC 60633. The DC system control/multiterminal control/master control is part of the hierarchical structure of an HVDC control system that has an integrated AC/DC system control as the highest level of control which governs the integrated operation of AC and DC systems of a power system. This control system is under the responsibility of the system operator.

DC system pole control, which is the control system of a pole in accordance with IEC 60633.

Control system of a substation bipole (IEC 60633).

Control system used for the controlling, monitoring and protection within a DC substation (IEC 60633). A DC substation control may be implemented at the bipole and/or pole level and may be referred to as local control.

Control system of a substation pole (IEC 60633).

Equipment controller is an automation function that can control one or multiple equipment function to achieve all the targets inside the given tolerance.

Frequency control function is a function block that calculate the operating point of the controlled equipment to achieve the target frequency.

Frequency monitoring terminal provides location in the model where the frequency is monitored for the purpose of power frequency control.

Function block is a function described as a set of elementary blocks. The blocks describe the function between input variables and output variables.

Functional input variable defines the domain of the function.

Functional output variable defines the codomain of the function.

Impedance control function is a function block that calculates the operating point of the controlled equipment to achieve the target impedance.

Injection controller is controlling the equipment which represents an injection or an external network.

Kind of injection controller mode.

Phase control function is a function block that calculate the operating point of the controlled equipment to achieve the target voltage.

Power electronics connection controller is controlling the equipment to optimize the power electronics connection.

Power electronics unit controller is controlling the equipment to optimize the power electronics unit.

Power factor control function is a function block that calculates the operating point of the controlled equipment to achieve the target power factor.

Kinds of power frequency control modes.

Power frequency controller is controlling the active power balance as typically done by the secondary control. If an unbalance between the scheduled active power values of each generation unit and the loads plus losses occurs, primary control will adapt (increase/decrease) the active power production of each unit (depending on the power shift key strategy), leading to an over- or under-frequency situation. The secondary frequency controller will then control the frequency back to its nominal value, re- establishing a cost-efficient generation delivered by each unit.