A STUDY OF INTERLINE POWER FLOW ANALYSIS BASED ON A NEW MATHEMATICAL MODEL OF INTERCONNECTED POWER SYSTEM WITH IPC

摘要

At present, a large parts of power networks are connected by AC tie-lines. Yet, there are some problems in the operation of AC interconnected power systems, such as fault spreading and the power fluctuation on tie-line. As a new FACTS device, IPC has several advantages such as fault current restriction and the robust control of tie-line power flow. After taking action to enhance the synchronous ability, IPC can play well effects to control tie-line power flow of interconnect power systems. Based on IPC network analytic equation, tracking estimation technology of Thevenin equivalent parameters for area network and the short-time-step dynamic power flow considering the frequency difference of area network, a mathematical model of frequency decoupling is established in this paper. Wholly considering the facts such as tie-line transmission capacity, port voltages of sending and receiving networks, the voltages of IPC capacitor and reactor, the parameter preferences are given. And the strategy of changing IPC parameters is used to control the tie-line power. The simulation of North China and Northeast interconnected power system is emulated to validate the proposed methods and to analyze the relative slippage between the two subsystems.