DIgSILENT PowerFactory Application Guide Dynamic Modelling Tutorial DIgSILENT Technical Documentation DIgSILENT GmbH Heinrich-Hertz-Str. 9 PowerFactory is easy to use and fully Windows compatible and can be integrated DIgSILENT YouTube channel; Interactive introductory tutorial and various. PowerFactory is a leading integrated power system analysis software, which covers the full range of functionality from standard features to highly sophisticated .
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Steady state representation of hydro turbine block diagram 4. The turbine is coupled to a synchronous generator, which is then connected to the network. Block definition for a hydro turbine Figure 4.
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Automatic calculation of initial conditions option in block definition The feature is located in the block definition dialog see Figure 4. It is sufficient to simply be aware that they exist and know that the definitions are here for reference.
Generator Control System The built-in synchronous machine model ElmSym is shipped by default without any controls. Consider the hydroelectric generation system shown in Figure 2. A block definition can be assigned as a macro by ticking the macro checkbox in the block definition dialog. March 21, — March 22, Powerfactoty connection of renewable generation S Step response of first-order lag differentiator 4.
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In this case, we can use an iterative search to calculate the initial disilent for vw. The input g, however, is unknown and needs to be initialised manually.
In such cases, these signals need to be initialised to dummy values for the purposes of model testing. Suppose that this turbine block will be connected in the frame shown in Figure 4.
From this steady-state representation, we can work backwards from the known output pt and calculate an initial value for the input g: Hydro Turbine Block Initialisation. There are three iterative search algorithms available powerfactry PowerFactory: Ticking the checkbox will activate the feature, however it requires some additional tutoriap to make it work properly. Single model definition referenced by two common models one-to-many Now suppose that one of the Basler voltage controllers is replaced with an AVK voltage con- troller.
As a result of this function, all graphical representations of the block definition are deleted. Models that contain highly sensitive data e. Some dummy initialisation values i.
General Software Information
These signals and variables will then be displayed in the data manager as shown in Figure 5. Like the integrator block, the state variable x should be initialised to the steady state output yo,ss. In the hydro turbine digsilen, the integrator block is redrawn and the steady-state represen- tation is shown in Figure 4.
Stores the value x Tnow and returns the value x Tnow-Tdelay. Pm, dU, U, etc. Note that not all of the variables and signals in a model need to be manually initialised.
Create a composite model and fill the slots with the relevant grid elements, e. The water in the penstock flows through the turbine and rotates it, before being discharged through the draft tube. An understanding of numerical simulation, particularly the concepts of state-space representations and solutions to differential-algebraic equations DAE is also desirable, but not essential.
An example of a composite frame for a synchronous generator Figure 3. DIgSILENT is staffed with experts of various disciplines relevant for performing consulting services, research activities, and user training.
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For the other slots, we will have to create common models and link them to the relevant model definition. The level of detail required in the controller models will of course depend on the types of studies to be conducted, performance requirements, degree of influence the unit has on the network, etc.
As a result, disturbances such as faults, load steps, etc will likely cause unstable frequency and voltage excursions since there are no governor or AVR actions to control these quantities.
In the hydro turbine example, we saw that pt is connected to the synchronous generator and thus known from the load flow calculation. In such cases, an iterative, numerical initialisation routine can be used. Consider the structure of the system to be modelled and how it can be broken down into discrete blocks that can be modelled separately 2.
Our Power System Monitoring PFM product line features grid and plant supervision, fault recording, power quality and grid characteristics analysis. The difference is that composite frames can only contain slots and con- nectors, whereas model definitions can contain blocks, summation points, multipliers, etc but not slots.
However, any internal state variables in the block need to be manually initialised.