Capacitor Allocation Study Considering Integration of Distributed Photovoltaic (PV) Systems in Power Distribution Networks Erita Astrid, Muhammad Dani Solihin, Rosma Siregar, Eka Dodi Suryanto
Universitas Negeri Medan
Abstract
The integration of distributed photovoltaic (PV) units in distribution systems has been significantly enhanced by recent improvements in renewable energy technologies, as well as changes in utility infrastructure and government policies, and plays an important role in supplying many recent microgrids. The absence of capacitors as sources of reactive power compensation for the PV integration increases total microgrid losses and voltage-instability threats. Therefore, capacitor planning is highly required due to the intensive use of PV. This paper proposes an optimization of capacitor allocation and sizing by considering the presence of PV integration. The bus candidates for capacitor allocation are selected using a new adaptive approach of loss sensitivity analysis. In the sizing process, the stochastic power output of PV generation is modeled using Monte Carlo simulation. The load flow equations are solved using the forward-backward sweep method. Capacitor compensation are optimally sized using enhanced Particle Swarm Optimization (PSO) to overcome the local minima problem. Operational and power quality constraints include the voltage magnitude of each bus, power constraints, and the number/size of installed capacitors. The net annual economic saving is defined as the associated objective function that accounts for the cost of installed capacitors to reduce losses. The proposed model is verified using the IEEE 33 radial bus system.
