NEPLAN | Consulting

Neplan AG is part of the international NEPLAN-Consulting® group, which offers a wide range of power system studies and consultancies. The group consists
of  about 250 experts all over the world and can help you to design, plan and operate your transmission, distribution and industrial/generation systems in an optimized way.

Our services are based on

  • 20 years experience in the power system consulting business with more than 1000 realized projects as a reference
  • huge expertise in performig complex studies (large networks, dynamic analysis, harmonics, …)
  • modular approach, which allows a customized solution
  • using the efficient NEPLAN software and providing training courses and/or field measurements
  • OPEX and CAPEX optimisation when applying NEPLAN Asset Mangement tool in system studies


NEPLAN-Consulting® group has experience in the following fields:

Renewable Energy sources

  • Feasability studies for integration of renewables with AC or DC technologies
  • Capacity credit studies
  • Impact studies incl. operation reserve and voltage recovery consideration
  • Interaction of renewables, eneryg storage and E-mobility

Market and Individual Asset Evaluation

  • Valuation of generating and transmission assets
  • Market risk assessment, profit and lost potentials
  • Project due diligence activities
  • Physical transmission access capability

Feasibility/System Impact/Facility Upgrading

  • Load flow, contingency, short circuit, and stability analysis for the interconnection of merchant projects
  • Interconnection configuration and conceptual designs
  • System reinforcement option and cost assessment

 Transmission Capability Analysis

  • Transmission constraint identification and mitigation
  • Simultaneous transfer limit calculations
  • Grid Code Compliance

Industrial Networks

  • Voltage drop and short circuit analysis
  • Protection settings
  • Motor starting with/without start-up device
  • Transient analyses
  • Harmonic analysis with filter layout
  • Integration of generation
  • Islanded operation and load shedding
  • Isolation coordination
  • Greenfield planning

System Dynamics and Control

  • Transient and dynamic stability analysis
  • Control tuning, design, and interactions
  • Sub synchronous resonances, SSTI, transient torque, torsional interaction
  • Voltage instability
  • PSS-tuning

Transient Analysis and Insulation Coordination

  • Arrester rating, energy requirements and location
  • Switching transients, equipment BIL, BSL
  • Phase-to-ground & phase-to-phase clearances
  • Contamination performance
  • Circuit breaker recovery voltage

Harmonic Analysis

  • Harmonic filter design, filter performance and rating
  • AC/DC harmonic filters, including active filters
  • Network harmonic flow

Distribution System Planning

  • Budget constrained planning
  • Two-Q (Quality & Quantity) Engineering
  • Distribution network evaluation
  • Distributed resource interconnection
  • Target network analysis based on greenfield approach


  • Probabilistic system planning
  • T&D system reliability evaluation
  • Substation RAM studies
  • Integrated generation and transmission planning
  • Failure mode, effect, fault tree analysis

Protective Relaying and Controls

  • Protective system design and relay coordination
  • Adaptive relaying, fault location
  • Phasor estimation, power quality, high impedance fault detection
  • Integration of protection, control and monitoring
  • Wide-area disturbance protection and control


  • AC/DC interactions, and planning
  • Conversion of AC lines to DC
  • Dynamic performance & control requirements
  • AC/DC filter design
  • Reactive power requirements
  • Equipment specification

Flexible AC Transmission (FACTS)

  • Planning: location, type and size
  • Dynamic performance & control requirements
  • Control design, interactions
  • Static VAR systems: SVC, GTO-based SVC

Grounding, Electromagnetic Field and Interference Analysis

  • Equivalent earth structure model
  • Current and potential distribution in the conductor (up to few MHz)
  • Ground potential rise
  • Resistance or impedance to earth
  • Earth surface potential
  • Touch and step voltages
  • Transferred potential
  • Magnetic field in the air
  • Electromagnetic interference due to grounding or power system