Modeling And Operation Characteristic Investigation For A Multi-functional Flexible Power Conditioner

A novel FACTS device, the multi-functional Flexible Power Conditioner (FPC), is introduced in the thesis. The proposed equipment consists of a doubly fed induction generator (DFIG) and a voltage-source pulse width modulation (PWM) rectifier-inverter. It makes use of an advanced synchronous condenser with a flywheel together with an AC excitation and vector control technology based on power electronics device. FPC can perform multi-functions including energy storage, active and reactive power generation when used in power systems, and it has more powerful capability to operate in a compensative manner and wider conditioning range for reactive power than those of the conventional synchronous condenser, that enables the proposed equipment to considerably enhance power system dynamic angular and voltage stabilities. This thesis is devoted to the modeling and the operation characteristic study of a FPC and its control system. The static and dynamic characteristic analysis of FPC is involved.A general overview of the background for the proposed FPC is presented at first, and development of the key technologies about FPC is introduced as well. A brief introduction of the base circuit topology and the operation principle of FPC is given.The modeling of FPC is presented in details, including modeling of generator with original parameters and generator parameters and modeling of its excitation system through a stator field oriented control which has been widely used in the other AC excitation systems.Finally, the basic static and dynamic characteristics of FPC are studied by simulation with the model developed. Simulation carried out includes different steady excitation status and the excitation characteristic in four quadrants, the power conditioning range of active and reactive power, the static stability in steady state operation conditions, the balance of real power in each operation conditions. Dynamic response characteristics of FPC and the fast and decoupled regulation for active and reactive power in four quadrants are testified.