Description

The ARTEMiS-SSN Nodal interface Blocks are used to define nodes and groups of the ARTEMiS-SSN solver. The SSN (State-Space Nodal) solver is a simulation solver that use nodal method to couple together, without delays, groups defined by their discretized SPS state-space equation or any model that has a discrete resistive companion model compatible with the nodal method of EMTP.

The ARTEMiS-SSN Nodal Interface Blocks (NIB) is used to define a nodal point and state-space groups in a Simscape Electrical Specialized Power Systems (SPS) schematic within the ARTEMiS-SSN solver. Each block instance defines a node by itself. The NIB also defines the perimeter of the SSN groups.

Table of Contents

Mask and Parameters

These various options are used to connect different types of SSN groups:
Number of phases	Set the number of phases for the NIB.
Number of Ports	Set the number of Ports of the block. All phase of a single port connects to a single SSN group.
Port x type	The Number of Ports parameter sets the number of Port x type (where x= 1 to 16) accessible by the user. For each Port x type parameter, 6 different options are possible.
	V-type(Left): Voltage type interface to the state-space groups, with ports on the left side V-type (Right): Voltage type interface to the state-space groups, with ports on the right side I-type (Left): Current type interface to the state-space groups, with ports on the left side I-type (Right): Current type interface to the state-space groups, with ports on the right side X-type (Left): External SSN group type interface, with ports on the left side X-type (Right): External SSN group type interface, with ports on the right side
	Inductive type SSN groups require a V-type interface Capacitive type SSN groups require an I-type interface External SSN models, such as the FD-line model, require an X-type interface

Examples

Example 1: NIB with I-Type and V-Type Interface

Take the following model, ArtemisSSN_simple_switched_case.mdl, which contains a switched inductive source connected to a filter bank.

The model has been separated into 2 SSN groups, with the intersection being defined by the NIB. The NIB interface is I-type in the direction of the capacitor of the filter bank while it is V-type in the direction of the inductive source. The type of interface is displayed on the block. The NIB also defines the 3 node that will used internally in the nodal part of the SSN solution.

Example 2: NIB with X-Type Interface, for SSN External Models

The model below simulates a Frequency Dependent Parameter Transmission Line (FD-line) based on the model originally developed by Marti. This FD-line model is internally coded using the nodal approach and can only produce discrete resistive companion model data like the model discrete admittance and history current sources. The direct inclusion of the line characteristic impedance Zc(ω) into a state-space method would have produced huge ABCD matrices because of the many states that compose Zc(ω).

For this reason, the SSN approach is preferred when the interface of this type of model to the state-space method of Simscape Electrical Specialized Power Systems (SPS). To make the interface, the NIB block must have the type-X chosen and connected toward the external SSN model, an FD-line model in this case. As previously, the NIB also defines the nodal point of the SSN solution. In this case, 6 nodes will be used in the nodal solution part of SSN.

Inputs and Outputs

PM-type connectors

Characteristics and Limitations

V- and I-type NIB blocks are used to compute the state-space equation of the SSN groups and are internally composed of current or voltage sources. State-space equation causality restrictions apply to these blocks. This is why V-type (internal voltage source) connects to inductive groups and I-type (internal current source) to capacitive type groups.

Direct Feedthrough	N/A
Discrete Sample Time	Yes
RT-LAB XHP Support	Yes
Work Offline	Yes