NEPLAN | Load Flow / Contingency Analysis

Load flow

The Load Flow calculation is the most fundamental analysis module and has suitable algorithms for Distribution, Transmission, Generation and Industrial Networks. Any type of electrical power system can be modelled, such as 3-, 2- and 1-phase systems with neutral and earth conductor, AC and DC systems, meshed and radial networks etc. New models and features are available to satisfy the requirements of modern concepts such as Smart Grids, Renewables (PV, Wind, etc.), eMobility, Energy Markets and more. The algorithms are very robust and has a high performance.

General Characteristics

• Various calculation algorithms: Current Iteration, Newton Raphson, Extended Newton Raphson, Voltage Drop method per phase (Back/Forward Sweep method), DC Load Flow (decoupled, only active power flow)
• Extensive Transformer regulation models: Voltage control On-Load Tap changers, Power control with Phase-Shifters, irregular impedance/tap variation, I-V Compounding, Remote control etc.
• Power Electronics: HVDC, PWM and FACTS devices such as SVC, STATCOM, TCSC, UPFC
• DC networks models: DC-Batteries, DC-Voltage source, DC-Photovoltaic panels, DC cables etc.
• Various Power source models: Slack, PQ, PV, PC, SC, PI, IC with intuitive assignment.
• Control functions: Distributed Slack, Multiple Reactive Power control, Controller conflict management, Remote control
• Power interchange control between Areas/Zones defined freely by users.
• Predefined and user defined scaling factors for fast load and generation variations
• Measurement data import and Load estimation (allocation).
• Calculation of Sensitivities (PDTF-factors, Loss sensitivities, Tap sensitivities)
• Convergence and initialization control.
• Data validation and indication of equipment with erroneous parameters.
• Remedial Action (Event Definition)
• Limit violations and feasibility reporting.

Results

There are several possibilities to view and analyse the results of each calculation:

• Violated elements/nodes are highlighted.
• Table results can be sorted and filtered.
• Many visualization options (line thickness, colour ranges, pie charts etc.)
• Raw results can be exported in different formats.
• Result comparison between different scenarios.