A. Yokoyama

An optimal power flow control method of power system using interline power flow controller (IPFC)

Interline power flow controller (IPFC) is a new concept of flexible AC transmission system (FACTS) controller with the unique capability for series compensation with the unique capability of power flow management among multi-line of a substation. Generally speaking, the IPFC employs a number of voltage sourced converters (VSCs) linked at the same DC terminal, each of which can provide series compensation for the selected line of the transmission system. Through common dc link, any inverters within the IPFC are able to transfer real power to any other and thereby facilitate real power transfer among the line. This paper, for simplicity, proposes the powerful tool applied on 3-machine 9-bus test system, basic test system with one loop, and optimal power flow (OPF) method. We can solve the OPF for the minimum cost and balance the entire power flow at the satisfied solution.

Reliability Analysis of Distribution System with Distributed Generation Considering Loss of Protection Coordination

Distributed generation (DG) is expected to improve the system reliability as its backup generation. However, DG contribution in fault current may cause the loss of the existing protection coordination, e.g. recloser-fuse coordination and breaker-breaker coordination. This problem can drastically deteriorate the system reliability, and it is more serious and complicated when there are several DG sources in the system. Hence, the above conflict in reliability aspect unavoidably needs a detailed investigation before the installation or enhancement of DG is done. The model of composite DG fault current is proposed to find the threshold that existing protection coordination is lost. Cases of protection miscoordination are described, together with their consequences. In addition, the issues of on-site DG and tie line are studied. Reliability indices are evaluated and compared in the distribution reliability test system RBTS Bus 2

Economic Benefit Comparison between Series FACTS Device Installation and New Transmission Line Investment in the Deregulated Power System using Probabilistic Method

Economic benefit of installing a static synchronous series compensator (SSSC) has been evaluated and compared to that of adding a new transmission line for the modified IEEJ East standard model system. The equipment availability and load variations are included probabilistically, and the evaluation has been made in terms of the energy generation bid cost in the deregulated spot market and the investment cost For the model system, the evaluation has favored the installation of a SSSC compared with adding a new transmission line. SSSC applications to other systems can be evaluated similarly