Controlling the Power Flow. Voltage Control System REGSysTM employed for Phase Shifting Transformers

Flexible controlling with REGSysTM

Phase Shifting Transformers Phase shifting transformers, also named quadrature boosters, are special power transformers which enable the control of the active power flow in three-phase power grids. For this purpose, a change of the tap position results in a modification of the load voltage angle instead of a modification of the voltage magnitude. The control of active power load flow is used to prevent overloading of certain power supply units by reversing the load flow. This process is based on the principle that the active power distribution on several parallel lines depends on the angular...

Controlling of Phase Shifting Transformers Since phase shifting transformers have to control the active power, the usual voltage set point is replaced by an active power set point. For this purpose the software feature PQCtrl of the REGSys™ product family is used. REGSysTM controller basic display when performing active power control This software module is a component of REG-D™ and REG-DA firmware and forms the basis for active or reactive power control. The active power itself is also used as a set point variable, which the controller calculates by voltage and current measurements. Usually,...

Single line diagram of the phase shifting transformer with redundantly control systems Phase Shifting Transformers as Transformer Bank with redundantly designed Control Systems The phase shifting transformer used in this project is a transformer bank consisting of six transformer poles with a power of 800 MVA. Due to the importance of the transformer, the control was designed redundant. On that note, there is a second equivalent and independent device for the phase shifter and the voltage controller. In case of a problem of the primary controller, the reserve system is automatically switched...

Application Example 2 Phase Angle and Longitudinal Controller with Automatic Determination for Active Power Set Points The special feature employed in this project is the automatic determination of the active power set point value for phase angle controller. For this purpose, there is communication between the control system of the phase shifting transformer and two additional voltage regulators, which manage the voltage in the distribution network. The set point value of the phase shifter results from the sum of the active power of the two distribution network transformers. For adaptation to...

Application Example 3 Phase Shifting Transformers with Adaptive Permissible Control Deviation (Bandwidth) In this application, a modification of the active power ∆P per on-load tap-change depends on the network configuration and is therefore not a constant. As a result, the permissible control deviation used for the control, must be adapted to the network conditions. Therefore, the expected on-load tap-change ∆P is calculated from the average of the effective changes of the last N tap operations. If less than N tap-changes are available yet, a default ∆P value is assumed which can be parameterized....

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