The power quality depends on two different disturbances known as voltage variation and voltage imbalance (better known as unbalance). The Voltage Variation Optimization (VVO) is a proven and effective technology to reduce the energy wastage due to the supply of higher voltage than its requirement. Optimizing the supply voltage prevents the equipments and machineries from early burn-out and reduces maintenance costs. Operating equipment at a higher voltage than it is designed for, does not improve performance; on the contrary it has the effect of reducing its lifespan. The implementation of VVO by utility sector not only saves their millions of invested money from being wasted, moreover helps in reducing the carbon footprint due to reduced CO2 emissions for less generation of power since till now reactive power has a smaller contribution in power generation.
TNB has taken an initiative for a research and development project of VVO for their Distribution System as an enabler to TNB’s Grid of the Future under initiative of Re-Imagining TNB. However, the main business challenge for TNB is that they don’t have any centralized system to continuously monitor, control and optimize the voltage variation in the distribution networks. All the reactive power sources and voltage regulators are not centrally controlled, managed and optimized by Distribution System Operator (DSO).
Here our expertise and service is helping TNB in achieving the objective in overcoming several challenges, like no centralized system, in some cases space problem in using required equipment etc. As a solution, we offered ETAP real-time software through which the network modelling is done and the results obtained from the ETAP VVO engine on the specified distribution feeders is shown, including loss reduction and voltage level improvements. ETAP VVO should be able to support both advisory and supervisory mode. In advisory mode, ETAP VVO engine keeps calculating the results, and providing the recommendation. However, the control signals do not be sent through ETAP to implement the change. User can request VVO recommendation on demand, or send controls manually based on VVO recommendation. In supervisory mode, ETAP VVO engine keeps calculating the results, and providing the recommendation. The controls based on recommendation is sent, constrained by maximum switching actions. Along with these, suggestions and recommendations are given for the Conservation Voltage Reduction that saves considerable energy at low cost and without adverse effect on the equipments.