Dynamic load flow

Dynamic load flow simulations: Grip on variable energy flows and capacity

Electrical installations are no longer static. With the integration of solar panels, charging stations, heat pumps and variable speed drives, energy flows vary continuously. A traditional capacity calculation is often no longer sufficient to guarantee operational reliability.

With dynamic load flow simulation (also known as load flow calculation), we map the behaviour of your installation over time. We simulate scenarios ranging from peak loads to future expansions. This way, we prevent unexpected outages, overloading transformers and unnecessary investments in copper and iron. Get certainty about your current and future grid capacity.

For whom is dynamic load flow relevant?

This analysis is crucial for organisations where the electrical installation is subject to change or critical to the business process. We often collaborate with:

• Installation managers (IV-ers): You are dealing with unexplained security stops or voltage dips.
• Technical Managers: You want to plan for expansion (new production lines, EV parks) and want to know whether the current transformer can handle it.
• Engineers: You are looking for validation of your design before the shovel goes into the ground (Digital Twin).
• Industry & Data Centres: Where 'uptime' is sacred and margins in capacity must be accurately known.

Why is understanding power flows essential?

The load on the power grid has changed dramatically in recent years. Where once the flow of energy was predictable from source to load, we now see bidirectional flows due to local generation. Without dynamic simulation, you run specific risks:

• Unnecessary capital expenditure (CAPEX): It is often thought that a heavier transformer or thicker cable is needed based on rules of thumb. Simulation often shows that smart control or phase balancing is sufficient.
• Operational downtime (OPEX): When protective devices trip due to underestimated inrush currents or harmonic loads, your process grinds to a halt.
• Compliance and safety: Does your installation still comply with standards (such as NEN 1010 or EN 50160) after the installation of that new heat pump system?
• Thermal load: Cables and transformers have thermal inertia. A short peak above the rated value is often allowed, provided you can substantiate this exactly with simulations.

What causes unpredictable loads?

Modern installations are more complex due to non-linear and variable loads. The main contributors to dynamic problems are:

• Electric Transport (EV): Starting charging sessions simultaneously creates huge peaks.
• Climate installations: Heat pumps and chillers switch on based on temperature, often leading to unexpected simultaneity.
• Renewable generation: PV installations provide feed-in, which can push the plant's voltage management beyond its limits.
• Frequency converters: although efficient, they create harmonic pollution that reduces the effective capacity of transformers (derating).

Roadmap for reliable load flow analysis

Want certainty about your installation? Follow this process:

1. Data collection: Collect single-wire diagrams, cable data and protection settings.
2. Measurement (Zero Measurement): Place Power Quality analysers to log actual loads for a minimum of one week (preferably including a production cycle).
3. Modelling: rebuild the installation in specialised simulation software (such as Vision or similar).
4. Simulation: Perform load flow analyses for various scenarios (normal operation, N-1 situation, future expansion).
5. Analysis & Reporting: Translate technical data into concrete conclusions. Is the cable thickness sufficient? Is the protection selectively tripping?
6. Validation: Compare simulation results with measurements to ensure accuracy.