Incorporating of IPFC in Multi-machine Power System Phillips-Heffron Model

Abstract

AbstractThe development of power networks has led to low-frequency oscillations in the power system. The relatively small and sudden disturbances in the network cause such oscillations in the system. In the normal case, the oscillations damp rapidly and the amplitude of oscillations does not exceed a certain value. But depending on the operating point conditions and the values of the system parameters, these oscillations may continue for a long time and at worst increase their amplitude. These oscillations can affect the power transmission capability and stability of the power system. PSS (Power System Stabilizer) and FACTS (Flexible AC Transmission Systems) devices are commonly used for damping low-frequency oscillations. The Interline Power Flow Controller (IPFC) among the FACTS device is suitable for the power flow control and stability of power systems. This chapter establishes an approach to derive the dynamical model of a multi-machine power system with embedded IPFC devices. Derivations about the stability analysis and the incorporating of IPFC to enhance the damping of low-frequency oscillations in a multi-machine power system based on Modified Phillips-Heffron modeling has been done. To demonstrate the application and efficiency of the developed models, a case study on a three-machine test power system with adding IPFC has been presented. Numerical results with MATLAB for dynamical simulations show the significant effects of IPFC on damping the low-frequency oscillations and especially validates the modeling procedure.KeywordsIPFCPhillips-Heffron modelFACTS DevicesStability of Multi-machine power systems