VELLD Power System Consult Sdn. Bhd.

is an independent electrical power system consulting firm providing power engineering solution services and advisory in Malaysia and ASEAN region


Power System Study

Load Flow Analysis


  • Load flow analysis is usually known as power flow analysis which is the steady state analysis of power system network. This analysis uncovers the electrical performance and power flows (real and reactive) for stipulated circumstances whenever the system is functioning under the consistent state.
Contingency Analysis


  • To identify the performance of the grid system with respect to the power flow and voltage during loss of transmissio/ distribution element.
  • To determine the need for reinforcements in order to allow the connection of the generating facility to the grid system.
Short Circuit Analysis


  • To provide short circuit ratings data for the selection of equipment.
  • To identify mitigations to ensure short circuit level remains within limits.
  • To calculate the maximum short circuit current contribution from the generating facility at the interconnection point in the event of single-phase fault to ground fault, phase to phase fault and bolted three-phase fault.
  • IEC 60909 calculation method is to be used.
Transient Stability Studies


  • To identify the grid systems’ stability to remain stable and maintain synchronism following a relatively large disturbance arising from the loss of tranmission/ distribution elements.
  • To investigate the system dynamic responses and stability limits of a power system.
Reactive Power Requirement Studies


  • To determine the necessity to install reactive power compensation equipment to meet the reactive power support for generating facilities.
Optimal Power Flow Studies


  • To determine the best operating levels for electrical power plants in order to meet demands given throughout a transmission network in order to minimize the operating cost.
  • To adjust the power system control settings while simultaneously solving the load network in order to minimize the operation cost.
Power Quality/ Harmonic Analysis


  • To assess power quality at the interconnection point during parallel operation of the generating facility in the grid system.
  • To determine mitigations to ensure the power quality at the interconnection point remains within allowable limits.
Arc Flash Analysis


  • To calculate the individual arcing current contributions and arc fault clearing time of all the protective devices.
  • To calculate the arc flash protection boundary and energy released.
  • To determine the level of the personal protective equipment (PPE).
Protection Coordination Studies


  • To analyse the characteristics of each protective device to confirm the sequence in which they will operate and to have discrimination between the different layers of protection of devices.
  • To determine the trip settings of each protective device
Motor Acceleration Analysis


  • To determine the sequence of starting large motors.
  • To determine the amount of voltage drop that will occur under normal starting conditions and how it will affect other equipment.
  • To evaluate starting voltage swings under compensated conditions.
Power Factor Correction Studies


  • To correct the network power factor in order to meet the requirements of grid/ distribution code to prevent power factor penalty.
  • To determine the size of capacitor bank to correct the network power factor.