General Studies of Series Reactor and Phase Shifting Transformer in Java Bali Subsystem

As the Java-Bali bulk electrical transmission system evolves and the energy demand is rapidly increasing, the means of transmission equipment that can support the reliability of the system needs to be evaluated. Recently some series reactors have just been installed in the 150kV grid managed by PT PLN (Persero) in the western system of Java-Bali, exactly in the Greater Jakarta and Banten Region (PLN UP2B DKI JKB). These series reactors reduce some excess short circuit parameters in the system but also modify the active power flow and may increase transmission losses in the system. Another transmission equipment that can modify the active power flow is the phase shifting transformer (PST). The PST is yet to be implemented in the Java-Bali system but it has quite a functional effect to customize the power flow. In this paper, the series reactor is compared to the PST in detailed simulations and represented in simplified figures. The studies include load flow, short circuit, and losses comparison. The paper shown the usage of those equipment can improve grid readiness and security of supply, even more in the era of the approach of clean energy, when generator dispatch will be limited and generator flexibility is getting constrained.